COLLAGEN CORP /DE
S-3/A, 1995-03-29
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 29, 1995
    
 
                                                       REGISTRATION NO. 33-58185
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                      ------------------------------------
 
   
                                AMENDMENT NO. 1
    
 
   
                                       TO
    
 
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                      ------------------------------------
                              COLLAGEN CORPORATION
             (exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                  <C>                                                <C>
              DELAWARE                                2500 FABER PLACE                               94-2300486
   (State or other jurisdiction of               PALO ALTO, CALIFORNIA 94303            (I.R.S. Employer Identification No.)
             incorporation                             (415) 856-0200
          or organization)           (Address, including zip code, and telephone number,
                                       including area code, of registrant's principal
                                                     executive offices)
</TABLE>
 
                      ------------------------------------
                               HOWARD D. PALEFSKY
         CHAIRMAN OF THE BOARD OF DIRECTORS AND CHIEF EXECUTIVE OFFICER
                              COLLAGEN CORPORATION
                                2500 FABER PLACE
                          PALO ALTO, CALIFORNIA 94303
                                 (415) 856-0200
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                      ------------------------------------
                           TARGET THERAPEUTICS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                  <C>                                                <C>
              DELAWARE                            47201 LAKEVIEW BOULEVARD                           95-3962471
   (State or other jurisdiction of                FREMONT, CALIFORNIA 94538             (I.R.S. Employer Identification No.)
             incorporation                             (510) 440-7700
          or organization)           (Address, including zip code, and telephone number,
                                       including area code, of registrant's principal
                                                     executive offices)
</TABLE>
 
                      ------------------------------------
                                  GARY R. BANG
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                           TARGET THERAPEUTICS, INC.
                            47201 LAKEVIEW BOULEVARD
                           FREMONT, CALIFORNIA 94538
                                 (510) 440-7700
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                                   COPIES TO:
 
<TABLE>
<S>                                                           <C>
                       Michael W. Hall                                              Alan C. Mendelson
                        James L. Brock                                              Paul B. Cleveland
                       David A. Garcia                                            COOLEY GODWARD CASTRO
                         David C. Lee                                               HUDDLESON & TATUM
                   VENTURE LAW GROUP, P.C.                                        Five Palo Alto Square
                     2800 Sand Hill Road                                           Palo Alto, CA 94306
                     Menlo Park, CA 94025                                             (415) 843-5000
                        (415) 854-4488
</TABLE>
 
                      ------------------------------------
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
    If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box: / /
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: /X/ The securities to be offered on
a delayed or continuous basis pursuant to Rule 415 include only the shares of
Common Stock, $0.0025 par value per share, of Target Therapeutics, Inc.
                      ------------------------------------
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<S>                                       <C>                <C>                      <C>                      <C>
--------------------------------------------------------------------------------
                                                                 PROPOSED MAXIMUM         PROPOSED MAXIMUM
          TITLE OF EACH CLASS                AMOUNT TO BE         OFFERING PRICE              AGGREGATE             AMOUNT OF
     OF SECURITIES TO BE REGISTERED           REGISTERED             PER UNIT              OFFERING PRICE       REGISTRATION FEE
----------------------------------------------------------------------------------------------------------------------------------
  % Exchangeable Subordinated Notes of
  Collagen Corporation Due 2002.........    $45,000,000(1)             100%                  $45,000,000               (2)
----------------------------------------------------------------------------------------------------------------------------------
Common Stock, $0.0025 par value per
  share, of Target Therapeutics,
  Inc.(3)...............................          --                    --                       --                   --(4)
----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Includes $5,000,000 principal amount of Notes that the Underwriters have the
    option to purchase from Collagen Corporation to cover over-allotments, if
    any, and shares of Common Stock of Target Therapeutics, Inc. (the "Target
    Common Stock") deliverable in exchange for such Notes.
   
(2) Previously paid.
    
   
(3) Such indeterminable number of shares of Target Common Stock as may be
    required to be delivered by Collagen Corporation upon exchange of the Notes
    being registered hereunder.
    
   
(4) Pursuant to Rule 457(i) and Rule 416, no additional registration fee is
    required with respect to the indeterminable number of shares of Target
    Common Stock deliverable upon exchange of the Notes.
    
                      ------------------------------------
 
THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION
8(A), MAY DETERMINE.
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>   2
 
                                EXPLANATORY NOTE
 
     This Registration Statement contains two prospectuses, one for use in the
public offering of the Notes, and the other for use in connection with the
exchange of Notes for shares of Common Stock of Target Therapeutics, Inc. in
accordance with the terms of the Notes on a continuous basis commencing after
effectiveness of this Registration Statement.
<PAGE>   3
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES
     MAY NOT BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE
     REGISTRATION STATEMENT BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT
     CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
     BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY STATE IN WHICH
     SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR
     QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
                                  $40,000,000              Subject to Completion
 
                                                                  March 23, 1995
 
                                [COLLAGEN LOGO]
 
                    % EXCHANGEABLE SUBORDINATED NOTES DUE 2002
                   EXCHANGEABLE FOR SHARES OF COMMON STOCK OF
 
                                 [TARGET LOGO]
 
                               ------------------
 
    The Notes will be exchangeable at any time after 60 days following initial
issuance thereof and prior to maturity, unless previously redeemed, into Common
Stock of Target Therapeutics, Inc. ("Target") owned by Collagen Corporation
("Collagen"), at an exchange price of $         per share, subject to adjustment
under certain conditions and subject to Collagen's option to pay a cash
equivalent. The Target Common Stock is traded on the Nasdaq National Market
under the symbol "TGET." On March 22, 1995, the last sale price of the Target
Common Stock as reported on the Nasdaq National Market was $36.00 per share.
Interest on the Notes will be payable semi-annually on May 1 and November 1 of
each year, commencing November 1, 1995.
 
    The Notes are not redeemable prior to May 10, 1998. Thereafter, the Notes
are redeemable at the option of Collagen, in whole or in part, at any time and
from time to time, at the redemption prices set forth herein, plus accrued
interest. Upon a Change in Control (as defined) of Collagen, holders of Notes
will have the right, subject to certain conditions and restrictions, to require
Collagen to purchase all or part of their Notes at the principal amount thereof
plus accrued and unpaid interest. See "Description of Notes."
 
    The Notes will be subordinate in right of payment to all existing and future
Senior Indebtedness (as defined) of Collagen. As of March 22, 1995, Collagen had
no Senior Indebtedness outstanding. See "Description of Notes -- Subordination
of Notes." Application has been made for inclusion of the Notes on the Nasdaq
System under the symbol "CGENG."
                               ------------------
 
THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK. SEE "RISK FACTORS."
                               ------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
         REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<S>                                <C>                  <C>                  <C>
--------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------
                                           PRICE            UNDERWRITING
                                            TO              DISCOUNTS AND         PROCEEDS TO
                                         PUBLIC(1)         COMMISSIONS(2)         COLLAGEN(3)
--------------------------------------------------------------------------------------------------
Per Note.........................            %                    %                    %
--------------------------------------------------------------------------------------------------
Total(4).........................            $                    $                    $
--------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Plus accrued interest, if any, from the date of issuance.
 
(2) See "Underwriting" for information relating to indemnification of the
    Underwriter.
 
(3) Before deducting expenses payable by Collagen estimated at $525,000.
 
(4) Collagen has granted to the Underwriter a 30-day option to purchase up to an
    additional $5,000,000 in principal amount of Notes on the same terms per
    Note solely to cover over-allotments, if any. If such option is exercised in
    full, the total Price to Public, Underwriting Discounts and Commissions, and
    Proceeds to Collagen will be $         , $         and $         ,
    respectively. See "Underwriting."
 
                               ------------------
 
    The Notes are offered by the Underwriter, subject to prior sale, when, as
and if delivered to and accepted by the Underwriter, and subject to the right of
the Underwriter to reject any order in whole or in part. It is expected that
delivery of the Notes will be made at the offices of Alex. Brown & Sons
Incorporated, Baltimore, Maryland, on or about          , 1995.
 
                               ALEX. BROWN & SONS
                                  INCORPORATED
 
                 THE DATE OF THIS PROSPECTUS IS APRIL   , 1995.
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     Collagen Corporation (together with its subsidiaries, unless the context
otherwise requires, "Collagen") and Target Therapeutics, Inc. (together with its
subsidiaries, unless the context otherwise requires, "Target") are subject to
the informational requirements of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), and in accordance therewith file reports and other
information with the Securities and Exchange Commission (the "Commission").
Reports, proxy and information statements and other information filed by
Collagen and Target may be inspected and copied at the public reference
facilities maintained by the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. and at certain of its regional offices located at: Seven World
Trade Center, 13th Floor, New York, New York; and 500 West Madison Street, Suite
1400, Chicago, Illinois. Copies of such material can be obtained from the Public
Reference Section of the Commission, 450 Fifth Street, N.W., Washington, D.C.
20549, at prescribed rates. Securities of Collagen and the Target Common Stock
are traded on the Nasdaq National Market. Reports and other information
concerning Collagen and Target may be inspected at the National Association of
Securities Dealers, Inc., 1735 K Street, Washington, D.C.
 
     Collagen and Target have filed with the Commission a registration statement
on Form S-3 (herein, together with all amendments and exhibits, referred to as
the "Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"), relating to the Notes offered hereby and the shares of Target
Common Stock deliverable upon exchange of the Notes. This Prospectus does not
contain all of the information set forth in the Registration Statement, certain
parts of which are omitted in accordance with the rules and regulations of the
Commission. For further information, reference is hereby made to the
Registration Statement.
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITER MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE NOTES OFFERED
HEREBY OR THE TARGET COMMON STOCK AT LEVELS ABOVE THOSE WHICH MIGHT OTHERWISE
PREVAIL IN THE OPEN MARKET. SUCH TRANSACTIONS MAY BE EFFECTED IN THE
OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITER AND OTHER SELLING GROUP
MEMBERS MAY ENGAGE IN PASSIVE MARKET MAKING TRANSACTIONS IN TARGET COMMON STOCK
ON THE NASDAQ NATIONAL MARKET IN ACCORDANCE WITH RULE 10B-6A UNDER THE
SECURITIES EXCHANGE ACT OF 1934. SEE "UNDERWRITING."
 
                                        2
<PAGE>   5
 
          INCORPORATION OF CERTAIN DOCUMENTS OF COLLAGEN BY REFERENCE
 
     The following documents heretofore filed by Collagen with the Commission
pursuant to the Exchange Act are incorporated by reference in this Prospectus:
 
     (1) Annual Report on Form 10-K for the year ended June 30, 1994, including
         those portions of the Proxy Statement for the 1994 Annual Meeting of
         Stockholders (held on October 25, 1994) incorporated by reference
         therein;
 
     (2) Quarterly Reports on Form 10-Q for the quarters ended September 30,
         1994, and December 31, 1994; and
 
     (3) Registration Statement on Form 8-A dated November 28, 1994 (relating to
         certain preferred stock purchase rights).
 
     All documents subsequently filed by Collagen pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934 prior to the
termination of the offering of Notes made hereby, shall be deemed to be
incorporated by reference herein and to be a part hereof from the date of the
filing of such documents. Collagen will provide without charge a copy of any and
all of such documents (exclusive of exhibits unless such exhibits are
specifically incorporated by reference therein) without charge to each person to
whom a copy of this Prospectus is delivered, upon written or oral request to
Investor Relations, Collagen Corporation, 2500 Faber Place, Palo Alto, CA 94303
(telephone number: (415) 856-0200).
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any subsequently filed document which also is incorporated or deemed to be
incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
 
           INCORPORATION OF CERTAIN DOCUMENTS OF TARGET BY REFERENCE
 
     The following documents heretofore filed by Target with the Commission
pursuant to the Exchange Act are incorporated by reference in this Prospectus:
 
     (1) Annual Report on Form 10-K for the year ended March 31, 1994, including
         those portions of the Proxy Statement for the 1994 Annual Meeting of
         Stockholders (held on August 10, 1994) incorporated by reference
         therein;
 
     (2) Quarterly Reports on Form 10-Q for the quarters ended June 30, 1994,
         September 30, 1994 and December 31, 1994;
 
     (3) Current Report on Form 8-K dated October 10, 1994, as amended;
 
     (4) Registration Statement on Form 8-A dated January 15, 1992; and
 
     (5) Registration Statement on Form 8-A dated September 21, 1994 (relating
         to certain preferred stock purchase rights).
 
     All documents subsequently filed by Target pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934 prior to the
termination of the offering of Target Common Stock made hereby, shall be deemed
to be incorporated by reference herein and to be a part hereof from the date of
the filing of such documents. Target will provide without charge a copy of any
and all of such documents (exclusive of exhibits unless such exhibits are
specifically incorporated by reference therein) without charge to each person to
whom a copy of this Prospectus is delivered, upon written or oral request to
Investor Relations, Target Therapeutics, Inc., 47201 Lakeview Boulevard,
Fremont, CA 94538 (telephone number: (510) 440-7700).
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any subsequently filed document which also is incorporated or deemed to be
incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
                            ------------------------
 
     Zyderm, Zyplast, Contigen, and the triple helix logo are registered
trademarks of Collagen. Target Therapeutics, Tracker, Soft Stream, Retriever,
Taper, Seeker, Dasher, Stealth, Zephyr, FasTRACKER and GDC are registered
trademarks of Target, and IDC, FasSTEALTH and FasGUIDE are trademarks of Target.
This prospectus also includes trademarks of companies other than Collagen and
Target.
 
                                        3
<PAGE>   6
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and financial statements and notes thereto appearing elsewhere in
this Prospectus. Except as otherwise specified, all information in this
Prospectus assumes no exercise of the Underwriter's over-allotment option.
 
                                    COLLAGEN
 
     Collagen develops, manufactures and markets on a worldwide basis high
quality biocompatible products for the treatment of defective, diseased,
traumatized or aging human tissues. Collagen has developed innovative products
by identifying medical applications for its technology, and building markets
with respected healthcare professionals, either directly or with marketing and
technology partners. Collagen's core products are principally used in cosmetic
and reconstructive applications for the face, the treatment of stress urinary
incontinence, and bone repair. In addition, Collagen has implemented an
"affiliate" program to expand its new product development activities outside of
the areas of its core competence, such as interventional cardiology and
ophthalmology.
 
                                  RISK FACTORS
 
     The securities offered hereby involve a high degree of risk. See "Risk
Factors."
 
                                  THE OFFERING
 
ISSUER OF THE NOTES........  Collagen Corporation, a Delaware corporation. The
                             Notes are not guaranteed by Target or any other
                             party.
 
SECURITIES OFFERED.........  $40,000,000 principal amount of      % Exchangeable
                             Subordinated Notes Due 2002 ($45,000,000 principal
                             amount of Notes if the Underwriter's over-allotment
                             option is exercised in full). The Notes will mature
                             on May 1, 2002, unless previously redeemed or
                             exchanged.
 
INTEREST PAYMENT DATES.....  May 1 and November 1, commencing November 1, 1995.
 
EXCHANGE RIGHTS AND
  COLLAGEN CASH OPTION
  ON EXCHANGE..............  The Notes will be exchangeable at the option of the
                             holder at any time after 60 days following initial
                             issuance thereof, unless
                             previously redeemed, into shares of Target Common
                             Stock at an
                             exchange price of $     per share, subject to
                             adjustment under certain conditions and subject to
                             Collagen's right to pay a cash equivalent.
 
REDEMPTION AT THE OPTION OF
  COLLAGEN.................  The Notes are not redeemable prior to May 10, 1998.
                             Thereafter, the Notes are redeemable at the option
                             of Collagen, in whole or in part, at any time and
                             from time to time, at the redemption prices set
                             forth herein, plus accrued interest.
 
REDEMPTION AT OPTION OF
  HOLDER UPON CHANGE IN
  CONTROL OF COLLAGEN......  Upon a Change in Control (as defined) of Collagen,
                             holders of Notes will have the right, subject to
                             certain conditions and restrictions, to require
                             Collagen to purchase all or part of their Notes at
                             the principal amount thereof plus accrued and
                             unpaid interest.
 
                                        4
<PAGE>   7
 
ORIGINAL ISSUE DISCOUNT....  Each Note is being offered with original issue
                             discount ("OID") for United States federal income
                             tax purposes equal to the excess of the principal
                             amount at maturity of the Note over the amount of
                             the issue price of the Note. For this purpose, a
                             Note's issue price does not include the portion of
                             the purchase price of the Note attributable to the
                             right to exchange the Note for Target Common Stock.
                             Accrued OID will be includible, periodically, in a
                             holder's gross income for United States federal
                             income tax purposes (in addition to the stated
                             interest) prior to exchange, redemption, other
                             disposition or maturity of such holder's Note,
                             whether or not such Notes are ultimately exchanged,
                             redeemed, sold or paid at maturity. In addition,
                             the exchange of a Note for Target Common Stock or
                             other Exchange Property will be treated as a
                             taxable disposition of the Note. See "Certain
                             United States Federal Income Tax Considerations."
 
SUBORDINATION..............  The Notes will be subordinate in right of payment
                             to all existing and future Senior Indebtedness (as
                             defined) of Collagen. As of March 22, 1995,
                             Collagen had no Senior Indebtedness outstanding.
                             The terms of the Notes do not restrict Collagen
                             from incurring Senior Indebtedness.
 
USE OF PROCEEDS............  Additions to working capital; equity and debt
                             investments in affiliated companies and other
                             strategic alliances; research and new product
                             development activities; the purchase or financing
                             of capital equipment and leasehold improvements;
                             repurchases of Collagen's Common Stock; other
                             general corporate purposes; and possibly strategic
                             acquisition opportunities, although no such
                             transactions are currently pending. Target will not
                             receive any of the proceeds from the sale of the
                             Notes.
 
TRADING INFORMATION........  Application has been made for inclusion of the
                             Notes on the Nasdaq SmallCap Market under the
                             symbol "CGENG." The Target Common Stock is traded
                             on the Nasdaq National Market under the symbol
                             "TGET."
 
                                        5
<PAGE>   8
 
             SUMMARY CONSOLIDATED FINANCIAL INFORMATION OF COLLAGEN
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                         SIX MONTHS ENDED
                                                             YEARS ENDED JUNE 30,                          DECEMBER 31,
                                            -------------------------------------------------------     -------------------
                                             1990        1991       1992(1)      1993        1994        1993        1994
                                            -------     -------     -------     -------     -------     -------     -------
<S>                                         <C>         <C>         <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenues................................    $49,904     $61,382     $67,182     $49,743     $65,552     $31,238     $35,302
Income (loss) from operations...........     12,033       8,657      (6,294)     (3,859)      8,607       3,791       5,717
Net gain from investments, principally
  Target................................         --          --       9,439      20,323          --          --         775
Equity in earnings (losses) of
  affiliates............................         --          --         (32)        968        (269)        (37)       (369)
Minority interest in earnings of
  Target................................         62         132       1,233          --          --          --          --
Income from continuing operations.......      6,873       5,113       1,408       9,732       4,920       2,037       3,552
Net income (loss).......................      4,095      (4,349)      1,147       8,743       4,920       2,037       3,552
Income per share from continuing
  operations............................    $   .77     $   .53     $   .14     $   .95     $   .50     $   .20     $   .37
Net income (loss) per share.............        .46        (.45)        .11         .85         .50         .20         .37
Shares used in computing per share
  information...........................      8,937       9,710      10,232      10,267       9,896      10,031       9,517
Ratio of earnings to fixed charges(2)...        7.8x        4.9x        2.6x       12.1x        6.9x        6.4x        8.5x
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                        DECEMBER 31, 1994
                                                                    JUNE 30,       ---------------------------
                                                                      1994          ACTUAL      AS ADJUSTED(3)
                                                                    --------       --------     --------------
<S>                                                                 <C>            <C>          <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital...................................................  $16,227        $ 13,580       $   51,855
Total assets......................................................   74,505          73,726          113,726
Long-term obligations.............................................       --              --           40,000
Stockholders' equity..............................................   49,082          47,872           47,872
</TABLE>
 
---------------
 
(1) As a result of the sale of a portion of Collagen's shares of Target in
     fiscal 1993, Collagen's ownership position in Target decreased to 34% in
     December 1992. Fiscal 1992 and all previous years contain consolidated
     results of Target. The fiscal 1993 and 1994 financial information is
     presented with Target accounted for under the equity method. See Notes 1
     and 3 of Notes to Consolidated Financial Statements of Collagen. Gains from
     Collagen's investment in Target contributed $20,323,000 ($1.98 per share)
     to fiscal 1993 earnings and $10,239,000 ($1.00 per share) to fiscal 1992
     earnings.
 
(2) The ratios of earnings to fixed charges were calculated by dividing the sum
     of (i) consolidated pretax income from continuing operations, (ii)
     adjustment to exclude the net equity income or loss of less than 50% owned
     affiliates and (iii) fixed charges, by fixed charges. Fixed charges consist
     of expensed interest and the estimated interest portion of rent expense.
 
(3) As adjusted to reflect the sale of the Notes offered hereby. See "Use of
     Proceeds" and "Capitalization."
 
                                        6
<PAGE>   9
 
                                     TARGET
 
     Target develops, manufactures and markets disposable and implantable
medical devices used in minimally invasive procedures to treat vascular diseases
of the brain associated with stroke and other disease sites accessible through
small vessels of the circulatory system. Interventional physicians can navigate
Target's variable stiffness micro-catheters and guidewires through tortuous
blood vessels not accessible using conventional catheters. Target's products are
used to treat diseased, ruptured or blocked blood vessels in the brain
responsible for stroke, the third leading cause of death in the United States.
One of these products, the GDC system, is being used in clinical trials to treat
and prevent the rupture of cerebral aneurysms. Target has recently submitted a
510(k) application to the FDA covering the GDC system. Target's products are
also used in regions of the body other than the brain. Target's products are
used prior to or in lieu of surgery and can significantly reduce procedural
trauma, complexity, risk to the patient, cost and recovery time. Target markets
its products through a direct sales force in North America and internationally
through a network of 30 specialty distributors, its German subsidiary, Target
Therapeutics International GmbH, and its joint venture in Japan with Century
Medical, Inc., a subsidiary of ITOCHU International, Inc.
 
              SUMMARY CONSOLIDATED FINANCIAL INFORMATION OF TARGET
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                            NINE MONTHS ENDED
                                                                 YEARS ENDED MARCH 31,                         DECEMBER 31,
                                                -------------------------------------------------------    --------------------
                                                 1990        1991        1992        1993        1994        1993        1994
                                                -------    --------    --------    --------    --------    --------    --------
<S>                                             <C>        <C>         <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF INCOME DATA:
Total revenues...............................   $ 8,604    $ 12,510    $ 20,449    $ 28,117    $ 35,353    $ 25,453    $ 34,497
Income from operations.......................       876       1,243       3,735       4,421       5,116       2,996       6,320
Net income...................................       583         707       2,500       3,580       4,951       3,241       5,257
Net income per share (1992-pro forma)(1).....                          $    .51    $    .51    $    .70    $    .46    $    .73
Shares used in computing net income per share
  and pro forma net income per share.........                             5,093       7,075       7,103       7,087       7,190
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                       MARCH 31,     DECEMBER 31,
                                                                                         1994            1994
                                                                                       ---------     ------------
<S>                                                                                    <C>           <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital......................................................................   $41,527        $ 43,054
Total assets.........................................................................    57,130          64,884
Long-term obligations................................................................       124             104
Stockholders' equity.................................................................    49,064          55,060
</TABLE>
 
---------------
(1) See Notes 1 and 6 of Notes to Consolidated Financial Statements of Target
    for pro forma information relating to Target's accounting for income taxes
    as a separate company.
 
                                        7
<PAGE>   10
 
                                  RISK FACTORS
 
     In addition to the other information in this Prospectus and documents
incorporated by reference herein, the following factors should be considered
carefully in evaluating an investment in the Notes (and related Target Common
Stock) offered by this Prospectus.
 
RISK FACTORS RELATING TO THE NOTES
 
     Volatility of Price of Notes.  The trading price of the Notes may be
subject to significant volatility based upon, among other factors, the trading
price of Target Common Stock, the prevailing rate of interest and the operating
results and financial condition of both Collagen and Target. The trading price
of Target Common Stock and the operating results and financial condition of
Collagen and Target are affected by a variety of factors. See "-- Risk Factors
Relating to Collagen" and "-- Risk Factors Relating to Target."
 
     Subordination of Notes; No Limitation on Senior Indebtedness.  The
indebtedness evidenced by the Notes is subordinate to the prior payment in full
of all Senior Indebtedness of Collagen. By reason of such subordination, in the
event of dissolution, insolvency or bankruptcy of Collagen, holders of the Notes
will be required to pay over their share of any distributions in respect of the
Notes until the holders of Senior Indebtedness have been paid if full. In
addition, the payment of principal, premium, if any, and interest on the Notes,
including the Redemption Price (as defined) and the Change in Control Price (as
defined), may be blocked at such time as there is a default on certain Senior
Indebtedness. The Indenture does not limit the incurrence of indebtedness by
Collagen, including Senior Indebtedness. See "Description of the
Notes -- Subordination of Notes."
 
     Notes Not Secured by Exchange Property.  The shares of Target Common Stock
initially deposited with the Exchange Agent, and any other property into which
the Notes may be exchangeable in accordance with their terms (the "Exchange
Property"), have not been pledged to secure the obligations of Collagen under
the Notes, and the holders of the Notes will therefore not be secured creditors
in the event of a bankruptcy, insolvency or liquidation of Collagen.
Accordingly, the right of a Noteholder to exchange Notes for Target Common Stock
or other Exchange Property may be adversely affected in the event of a
bankruptcy, insolvency or liquidation of Collagen. Furthermore, the Exchange
Property would likely be considered property of Collagen, and any attempt by
Noteholders to exchange their Notes for Exchange Property after such a
bankruptcy would be blocked by the automatic stay or other provisions of the
bankruptcy laws. See "Description of the Notes -- Exchange Rights."
 
     Withdrawal of Exchange Property; Tax Effect.  In the event of a
reorganization of Target, such as a merger, consolidation, tender or exchange
offer or certain other events, or a distribution to the Target stockholders,
that results in a taxable event to Collagen as a holder of Target Common Stock,
the Indenture provides that Collagen may pay the tax owed by Collagen resulting
from such reorganization or distribution with proceeds from the Exchange
Property. The balance of the Exchange Property, after payment of such taxes,
will be available to the Noteholders upon exchange of the Notes. As a result of
the payment of such taxes from the Exchange Property, the net amount of Exchange
Property received by a holder upon exchanging Notes for such Exchange Property
may be significantly less than the amount of Exchange Property that would have
been received by such holder had the holder exchanged its Notes immediately
prior to such reorganization or distribution. See "Description of the
Notes -- Exchange Rights" and "Certain United States Federal Income Tax
Consequences -- Exchange of Notes for Target Common Stock."
 
     Absence of Prior Public Market.  Prior to this offering, there has been no
public market for the Notes. Although application has been made for inclusion of
the Notes in the Nasdaq SmallCap Market, there can be no assurance that a
regular trading market in the Notes will develop or be sustained.
 
                                        8
<PAGE>   11
 
RISK FACTORS RELATING TO COLLAGEN
 
     Reliance on Key Products.  Sales of Collagen's principal collagen-based
injectable products, Zyderm I Collagen Implant ("Zyderm I Implant"), Zyderm II
Collagen Implant ("Zyderm II Implant") and Zyplast Implant, accounted for
approximately 67% and 71% of consolidated product sales for the fiscal year
ended June 30, 1994 and the sixth months ended December 31, 1994, respectively.
Collagen's product sales may continue to consist primarily of sales of these
principal products. Factors such as adverse publicity, adverse rulings by
regulatory authorities, introduction of competitive products by third parties or
other loss of market acceptance for these principal products may significantly
and adversely affect Collagen's business, financial condition and results of
operations. See "Business of Collagen -- Products, Markets and Methods of
Distribution."
 
     Governmental Regulation and Adverse Publicity.  Collagen's manufacturing
activities and products sold in the United States are subject to extensive and
rigorous regulation by the U.S. Food and Drug Administration ("FDA") and by
comparable agencies in certain foreign countries where these products are
manufactured or distributed. The FDA regulates the manufacture, clinical
research and sale of medical devices, including labeling, advertising and
recordkeeping. Collagen's primary products are classified as Class III medical
devices, which require pre-market approval from the FDA. All of Collagen's
products described in "Business of Collagen -- Products, Markets and Methods of
Distribution" are approved for sale in the United States. Medical products whose
market applications have not yet been approved by the FDA may only be exported
with the specific approval of the FDA. There can be no assurance that the FDA
will choose to characterize future products as medical devices rather than drugs
or biologics. Any such change in FDA characterization would potentially lengthen
and increase the cost of the approval process. Failure to comply with applicable
regulatory requirements can, among other things, result in fines, suspensions of
regulatory approvals, product recalls, seizure of products, operating
restrictions, injunctions and criminal prosecution. In addition, government
regulations may be established that could prevent or delay regulatory approval
of Collagen's products. Furthermore, compliance with current Good Manufacturing
Practices regulations is necessary to receive FDA approval to market new
products and to continue to market current products.
 
     The continuing trend of more stringent FDA oversight in product clearance
and enforcement activities has caused medical device manufacturers to experience
longer approval cycles, more uncertainty, greater risk and higher expenses.
Failure to obtain, or delays in obtaining, the required regulatory approvals for
new products could adversely affect Collagen, as could product recalls. In
addition, there can be no assurance that the FDA will give approval to Collagen
to market its current products for broader or different applications, or that it
will grant approval with respect to separate product applications which
represent extensions of the basic collagen technology, or that existing
approvals will not be withdrawn. Further, changes in governmental reimbursement
systems, pursuant to which hospitals and physicians are reimbursed for medical
procedures at a fixed rate according to diagnosis-related groups or other
reimbursements, could have an economic impact on the purchase and use of medical
devices. A material decrease in current reimbursement levels for Contigen Bard
Collagen Implant ("Contigen Implant") and its application in the treatment of
intrinsic sphincter deficiency ("ISD") could have a material adverse effect on
Collagen's business, financial condition and results of operations.
 
     The collagen used in Collagen's products is derived from cow hides. Bovine
Spongiform Encephalopathy ("BSE") is a disease, initially reported in cattle in
the United Kingdom, characterized by degenerative lesions of the central nervous
system. The source of infections in animals derives from eating infected
sheep-derived feed. The disease has been reported in European countries with
less than one percent of cattle being affected. Collagen is not aware of any
reports of BSE in U.S. cattle to date. Furthermore, U.S. cattle are not fed
sheep-derived protein and the U.S. prohibits all importation of British cattle.
All of Collagen's injectable collagen products are currently derived from the
hides of U.S. cattle. In response to the heightened awareness of BSE in Europe,
 
                                        9
<PAGE>   12
 
Collagen currently uses "closed herds" that are controlled as to lineage, feed,
and separation from other animals. There can be no assurance that the various
foreign or domestic regulatory authorities will not raise issues regarding BSE
or other matters which may adversely affect Collagen's ability to manufacture,
market or sell its products.
 
     Over the past several years, Collagen has been the subject of legislative
and regulatory investigations relating to, among other things, the safety and
efficacy of its injectable collagen products. There can be no assurance that
legislative and regulatory investigations or negative publicity from such
investigations or from the news media will not result in a material adverse
effect on Collagen's business, financial condition or results of operations. In
addition, significant negative publicity could result in an increased number of
product liability claims. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations of Collagen" and "Business of
Collagen -- Litigation."
 
     Dependence on Marketing Partners and Third Party Distributors; Effect of
Inventory Fluctuations.  Collagen has entered into certain exclusive
arrangements with C.R. Bard, Inc. ("Bard")for the marketing and distribution of
Collagen's Contigen Implant product and with Zimmer, Inc. ("Zimmer"), for the
marketing and distribution of Collagraft Bone Graft Matrix ("Collagraft
Implant") and Collagraft Bone Graft Matrix Strip ("Collagraft Strip") products.
As a result, Collagen's revenues and earnings for these products depend
substantially upon the continuing efforts of these marketing partners.
Collagen's business and financial results could be adversely affected in the
event that either or both of these parties do not effectively market Collagen's
products, accurately anticipate customer demand or effectively manage
industry-wide pricing and cost-containment pressures in health care. Collagen's
revenues and earnings fluctuate based upon the levels of orders placed by these
parties, which are in turn affected by the levels of sales by these distributors
and the levels of their inventories. Under an agreement between Collagen and
Bard, Bard agreed to make certain minimum purchases of Contigen Implant
products, and Bard currently has significant inventory of these products. No
minimum purchases are required under this agreement after June 30, 1995, and
there can be no assurance that Bard's purchases of Contigen Implant will not
decrease thereafter to the extent that Bard seeks to reduce its Contigen Implant
inventory levels. Any significant decrease in such purchases could have a
material adverse effect on Collagen's operating results. In addition, Collagen
depends upon third party distributors to market its other products in a number
of international markets. Difficulties in Collagen's relationship with these
distributors and changes in distribution arrangements may adversely affect
Collagen's business, financial condition and results of operations. See
"Business of Collagen -- Products, Markets and Methods of Distribution."
 
     Undeveloped and Uncertain Markets.  Certain of Collagen's products,
including those marketed by its marketing partners, are intended for use in new
markets the size of which are difficult to independently verify. In particular,
the potential market for Collagen's Contigen product is difficult to estimate
because Contigen represents a new method of treatment, and Collagen believes
that most sufferers of stress urinary incontinence do not seek medical
treatment. Furthermore, Contigen is marketed to urologists, whom Collagen
believes generally are not the primary care physician for individuals seeking
treatment for this disorder. Should the markets for such products be more
limited than Collagen or its marketing partners currently estimate, or should
Collagen, its distributors and/or its marketing partners fail to penetrate such
markets to the extent anticipated, Collagen may experience lower than
anticipated revenues and a resulting adverse effect on its business, financial
condition and results of operations.
 
     Risk of Investments in Affiliates.  Collagen has made significant equity
and debt investments in affiliated companies that are involved in the
development of complementary or related technologies or products, and Collagen
currently intends to continue to make significant additional investments from
time to time in the future. These affiliated companies typically are in an early
stage of development and may be expected to incur substantial losses. As a
result, Collagen has recorded and expects to continue to record a share of the
losses in such affiliates attributable to Collagen's
 
                                       10
<PAGE>   13
 
ownership, which losses have had and will continue to have an adverse effect on
Collagen's operating results. Furthermore, there can be no assurance that any
investments in affiliates will result in any return nor as to the timing of such
return, or that Collagen will not lose its entire investment. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations of
Collagen."
 
     Patents and Proprietary Technology.  Collagen depends substantially upon
its proprietary technological expertise in the extraction, purification, and
formulation of collagen-based materials and other biomaterials into biomedical
products. Collagen seeks patents on inventions concerning novel manufacturing
processes, compositions of matter, and applications for its proprietary
biomaterials.
 
     Patent-related litigation is an increasing risk in the medical device
industry. There can be no assurance Collagen will be successful in the future in
obtaining patents or license rights, that patents will be issued for Collagen's
current patent applications, that Collagen will develop additional proprietary
technology that is patentable, that any issued patents will provide Collagen
with any competitive advantages or will not be challenged by third parties, or
that patents of others will not have an adverse effect on Collagen. There can be
no assurance that others will not independently develop similar products,
duplicate any of Collagen's products, or design around any patents used by
Collagen. No assurance can be given that Collagen's processes or products will
not infringe patents or proprietary rights of others or that any licenses
required under any such patents or proprietary rights would be made available on
terms acceptable to Collagen. If Collagen does not obtain such licenses, it
could encounter delays in product introductions while it attempts to design
around such patents, or it could find that the manufacture, sale or use of
products requiring such licenses could be enjoined. In addition, Collagen could
incur substantial costs in defending itself in suits brought against Collagen on
such patents or in bringing suits to protect Collagen's patents against
infringement.
 
     Competition.  The medical device industry is characterized by rapidly
evolving technology and increasing competition. At the present time there is a
commercial product in the United States that is directly competitive with Zyderm
and Zyplast Implants, Collagen's collagen-based products for cosmetic and
reconstructive surgery. This product is a gelatin-based (denatured collagen)
product for soft tissue augmentation presently being marketed in the U.S. and
Canada. Collagen is also aware of one foreign company which is marketing
internationally a collagen-based material for soft tissue augmentation. In
addition, several companies are engaged in research and development activities
relating to the use of collagen and other biomaterials for the correction of
soft tissue defects. Collagen's injectable collagen products also compete in the
dermatology and plastic surgery markets with substantially different alternative
treatments, such as surgery and topical applications. In addition, several
companies and institutions are engaged in the development of collagen-based and
other materials, techniques, procedures and products for use in medical
applications anticipated to be addressed by Collagen's Contigen Implant,
Collagraft Implant and Collagraft Strip products. Some of these companies and
institutions may have substantially greater capital resources; research and
development staffs and facilities; and experience in conducting clinical trials,
obtaining regulatory approvals, and manufacturing and marketing products similar
to those of Collagen. These companies and institutions may represent significant
long-term competition for Collagen. There can be no assurance that Collagen's
competitors will not succeed in developing technologies and products that are
more effective than any which have been or may be developed by Collagen or that
would render Collagen's technology and products obsolete or non-competitive.
There can be no assurance that such potential competition will not have an
adverse effect on the future business, financial condition or results of
operations of Collagen. Certain of Collagen's collagen-based products, including
the Zyderm implants, were manufactured and sold pursuant to an exclusive license
from Stanford University under a U.S. patent, which expired in April 1993,
covering the use of native, solubilized collagen for soft-tissue augmentation.
The expiration of this patent may result
 
                                       11
<PAGE>   14
 
in increased competition in the market for injectable collagen implants if and
as other companies enter that market. See "Business of Collagen -- Competition."
 
     Effect of Reduced Ownership Interest in Target.  As of March 15, 1995,
Collagen owned 2,124,194 shares of Target Common Stock, representing
approximately 30% of the outstanding shares of Target Common Stock. Collagen's
earnings have been favorably affected in recent periods by Collagen's equity in
earnings of Target, which represented a benefit to Collagen of approximately
$1.7 million in fiscal 1994 and approximately $1.1 million in the six month
period ended December 31, 1994. Collagen has engaged in regular open-market
sales of its Target Common Stock and expects to continue such sales. Collagen's
ownership of Target may also be further reduced through additional equity
offerings by Target that dilute Collagen's ownership interest, exchanges of
Notes for shares of Target Common Stock or otherwise. As a result of such
reduced ownership, Collagen's equity in any earnings of Target will decrease,
which will have an adverse effect on Collagen's operating results. In addition,
Collagen will not recognize any further equity in earnings or losses of Target
after such time as Collagen ceases to own at least 20% of Target's outstanding
voting stock. See "Beneficial Ownership of Target Common Stock By Collagen and
Certain Other Relationships."
 
     Product Liability; Insurance.  Collagen is involved in various legal
actions arising in the ordinary course of business, the majority of which
involve product liability claims. While the outcome of such matters currently is
not determinable it is management's opinion that these matters will not have a
material adverse effect on Collagen's future consolidated financial position and
results of operations.
 
     Collagen faces an inherent business risk of exposure to product liability
claims alleging that the use of Collagen's technology or products has resulted
in adverse effects. Such risks will exist even with respect to those products
that have received or in the future may receive regulatory approval for
commercial sale. There can be no assurance that Collagen will avoid significant
product liability claims and attendant negative publicity. Furthermore, there
can be no assurance that present insurance coverage will be adequate or that
adequate insurance coverage will remain available at acceptable costs, if at
all, or that a product liability claim or recall would not adversely affect the
future business or financial condition of Collagen. In addition, adverse product
liability actions could negatively affect Collagen's ability to obtain and
maintain regulatory approval for its products.
 
     In light of regulatory investigations surrounding product safety, Collagen
announced in September 1991 that it would indemnify physicians against damages
and legal fees arising from lawsuits brought to a jury trial alleging a link
between collagen injections and Polymyositis and Dermatomyositis. To date, the
impact of this indemnification on Collagen's results of operations has not been
significant. There can be no assurance, however, that any future such claims
would not have a material adverse effect on Collagen's operating results.
 
     Impact of Currency Fluctuations; Importance of Foreign
Sales.  Approximately 32% and 33% of Collagen's revenues in fiscal year 1994 and
the six month period ended December 31, 1994, respectively, came from its
international operations. Because international sales of Collagen's products
typically are denominated in local currencies, Collagen's results of operations
have been and are expected to continue to be affected by changes in exchange
rates between certain foreign currencies and the United States dollar. Although
the effect of currency fluctuations on Collagen's operating results were
positive during the six month period ended December 31, 1994, there can be no
assurance that Collagen will not experience unfavorable currency fluctuation
effects in future periods, which could have an adverse effect on Collagen's
operating results. Prior to December 1994, Collagen engaged in certain hedging
transactions to mitigate currency exchange exposure. Collagen does not currently
engage in any currency hedging activities. Collagen's operations and financial
results also may be significantly affected by other international factors,
including changes in governmental regulations or import and export restrictions,
and foreign economic and political conditions generally. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations of
Collagen."
 
                                       12
<PAGE>   15
 
     Single Manufacturing Facility.  All of Collagen's manufacturing capacity is
located in a single facility. An earthquake, fire or other similar calamity
could result in significant disruptions and delays in Collagen's manufacturing
and distribution process. Collagen currently maintains only limited amounts of
finished product inventory, and Collagen's business, financial condition and
results of operations would be materially adversely affected in such event.
 
     Dependence on Key Personnel.  Collagen is dependent upon a limited number
of key management and technical personnel, the loss of any one of which could
have a material adverse effect on Collagen's business. Collagen's future success
will depend in part upon its ability to attract and retain highly qualified
personnel. Collagen competes for such personnel with other companies, academic
institutions, government entities and other organizations. There can be no
assurance that Collagen will be successful in hiring or retaining qualified
personnel. See "Business of Collagen -- Employees."
 
     Third-Party Reimbursement.  Certain of Collagen's products, including the
Contigen Implant, Collagraft Implant and Collagraft Strip products, are
purchased by hospitals or physicians, which, in the United States, then bill
various third-party payors including Medicare, Medicaid and private insurers for
the healthcare services provided to patients. Third-party payors are
increasingly challenging the prices charged for medical products and services.
There can be no assurance that the reimbursement of treatments using Collagen's
products will not be subject to such challenges in the future.
 
RISK FACTORS RELATING TO TARGET
 
     Volatility of Stock Price and Quarterly Fluctuations in Operating
Results.  Target's stock price has been and may continue to be subject to
significant volatility, particularly on a quarterly basis. Any shortfall in
revenues or earnings from levels expected by securities analysts could have an
immediate and significant adverse effect on the trading price of Target's Common
Stock in any given period. Furthermore, Target participates in a highly dynamic
industry, which often results in significant volatility of Target's Common Stock
price. The trading price of Target's Common Stock also may vary on the basis of
numerous other factors, including the timing and amount of expenses associated
with expanding Target's operations both domestically and internationally,
increased revenues and expenses in conjunction with Target's recently commenced
German operations, Target's ability to successfully meet new product development
plans, success in achieving regulatory clearance for new products (such as
Target's detachable coil systems) in a timely manner, the acceptance of new
product introductions both in the United States and internationally, the mix
between pilot production of new products and full-scale manufacturing of
existing products, the mix between domestic and export sales, the availability
of complementary products and the effects this may have, particularly on
domestic sales, possible changes in ordering patterns of its customers due to
changes in the business environment or to potential variations in foreign
exchange rates, Target's ability to continue to attract qualified engineers to
further the development of future products, potential future partnering
arrangements, changes in the domestic and foreign health care policies
(including third-party reimbursement issues), increased competitive forces,
developments in Target's ongoing intellectual property litigation, and the
general litigious nature of the medical device industry. Target also believes
that seasonal patterns, including a reduction in the number of procedures
performed by physicians using Target's products during summer and holiday
periods, may affect its quarterly revenue stream. In addition, Target cannot
predict ordering rates by distributors, some of which place infrequent stocking
orders while others order at regular intervals. Although Target has experienced
revenue growth since its inception and has been profitable on a quarterly basis
since the quarter ended December 31, 1990, no assurance can be given that
revenue growth or profitability on a quarterly or annual basis will be
sustained. Target's results of operations have varied significantly from quarter
to quarter, and revenue growth rates have been inconsistent. As a result of
these and other factors, Target expects to continue to experience significant
fluctuations in the trading price of its Common Stock and in its quarterly
operating results.
 
                                       13
<PAGE>   16
 
     Reliance on Future Products and New Applications.  Target has an ongoing
and active research and development program pursuant to which it is developing
several new and enhanced versions of its catheters, guidewires and micro-coils.
Target's future success will depend upon, among other factors, its ability to
develop or acquire from third parties, introduce and manufacture new products or
enhanced versions of existing products and to obtain regulatory clearance on a
timely basis for such products or for use of existing products for new
indications. Target is also developing technology that enhances the performance
of its existing catheter and guidewire products. In addition, Target has several
new versions of its micro-coils under development. There can be no assurance
that Target will be able to develop or acquire new products successfully, to
manufacture new products in commercial volumes, to obtain regulatory clearances
on a timely basis to use such products in existing or new clinical applications
or to gain satisfactory market acceptance for such products. Delays in
commercial introduction or acceptance of new products could have a material
adverse effect on Target's business, financial condition and results of
operations. See "Business of Target -- Product Development" and "Business of
Target -- Government Regulation and Product Testing."
 
     Governmental Regulation.  The manufacture and marketing of Target's
products are subject to extensive and rigorous federal and state regulation in
the United States and to various regulatory requirements in other countries. The
process of obtaining and maintaining required regulatory clearances is lengthy,
expensive and uncertain. The FDA requires that a new medical device or a new
indication for use of an existing medical device obtain either a 510(k)
premarket notification clearance or an approved Premarket Approval application
("PMA") prior to being introduced into the market. The process of obtaining a
510(k) clearance has recently taken at least six months from the date of filing
of the application and generally requires the submission of supporting data,
which can be extensive and extend the process for a considerable length of time.
In addition, the FDA may require review by an advisory panel as a condition for
510(k) clearances, which can further lengthen the process. The PMA process
generally takes more than two years from initial filing and requires the
submission of extensive supporting data and clinical information. No assurance
can be given that any future products or applications developed by Target will
not require clearance under the more lengthy and expensive PMA process. If
Target is required to obtain clearance for any products pursuant to the PMA
procedure or if the 510(k) process with respect to any products is extended for
a considerable length of time, the commencement of commercial marketing could be
delayed substantially.
 
     Sales of medical devices outside the United States are subject to foreign
regulatory requirements that vary widely from country to country. The time
required to obtain clearance required by foreign countries may be longer or
shorter than that required for FDA clearance, and requirements for licensing may
differ significantly from FDA requirements. Some countries have historically
permitted human studies earlier in the product development cycle than
regulations in the United States. Other countries, such as Japan, have standards
similar to those of the FDA. This disparity in the regulation of medical devices
may result in more rapid product clearance in certain countries than in the
United States, while clearance in countries such as Japan may require longer
periods than in the United States. In addition, the European Union has developed
a new approach to the regulation of medical products which may significantly
change the situation in those countries. The receipt or denial of FDA clearance
for a particular product may affect the receipt or denial of regulatory
clearance for that product in certain other countries.
 
     There can be no assurance that Target will obtain timely regulatory
clearance for its future products, or that existing clearances will not be
withdrawn. In particular, there can be no assurance that Target's pending 510(k)
application for the Guglielmi Detachable Coil ("GDC") system, which was filed in
March 1995, will be granted in a timely manner or at all. Target anticipates
that this application, which includes clinical data on approximately 800
patients, will be reviewed by advisory consultants to the FDA, some of whom may
also be members of other FDA panels, which is expected to further extend the
review process. Moreover, regulatory clearances, if granted, may
 
                                       14
<PAGE>   17
 
include significant limitations on the indicated uses for which a product may be
marketed. Failure to comply with applicable regulatory requirements can, among
other consequences, result in fines, civil penalties, injunctions, suspensions
or losses of regulatory clearances, product recalls, seizure of products,
operating restrictions, refusal of the government to approve product license
applications or allow Target to enter into supply contracts, and criminal
prosecution. In addition, governmental regulations may be established that could
prevent or delay regulatory clearance of Target's products. Delays in receipt
of, or failure to receive, clearances, or the loss of previously received
clearances, could have a material adverse effect on Target's business, financial
condition and results of operations. See "Business of Target -- Government
Regulation and Product Testing."
 
     Product Liability Litigation; Insurance.  Target faces the risk of
financial exposure to product liability claims alleging that the use of Target's
products resulted in adverse effects. Target's products are often used in
life-threatening situations and in the brain, where there is a high risk of
serious injury or death. Such risks will exist even with respect to those
products that have received, or in the future may receive, regulatory clearance
for commercial sale. Target is currently a party to several legal actions
involving product liability claims. While Target seeks to maintain product
liability insurance with coverage that Target believes is comparable to that
maintained by companies similar in size and serving similar markets, there can
be no assurance that Target will avoid significant product liability claims and
attendant adverse publicity. Furthermore, there can be no assurance that
Target's product liability insurance will be adequate or that such insurance
coverage will remain available at acceptable costs. A successful claim brought
against Target for which coverage is denied or in excess of its insurance
coverage could have a material adverse effect on Target's business, financial
condition and results of operations. Additionally, it is possible that adverse
product liability actions could negatively affect Target's ability to obtain and
maintain regulatory clearance for its products. See "Business of
Target -- Product Liability Litigation and Insurance."
 
     Concentrated Customer Base and Adoption of Technology.  Target believes
that the number of interventional neuroradiologists and neurosurgeons trained to
use its vascular access and delivery products to treat neurovascular disorders
is relatively small, both in the United States and abroad. The growth in the
number of neuro-interventional physicians in the United States is constrained by
the lengthy training programs required to educate these physicians. Target
believes that there are approximately 130 interventional neuro-radiologists in
the United States and that approximately 30 physicians are currently being
trained to perform neuro-interventional procedures in fellowship programs at 15
hospitals in North America. Future growth of the market for Target's
neurovascular micro-catheters will require continued expansion of the number of
trained interventional practitioners. To the extent that physicians do not adopt
micro-catheters for use in treating neurovascular disorders or sufficient
physicians are not trained in the use of Target's products, both in the United
States and abroad, the market for Target's products may remain limited. See
"Business of Target -- Marketing and Sales."
 
     Competition.  The medical device industry is characterized by rapidly
evolving technology and competition. Target currently experiences competition in
the interventional neuroradiology market and expects such competition to
increase substantially. Several companies in the United States, including large
companies with resources significantly greater than those of Target, have
introduced products that are being used in the interventional neuroradiology
market. Target is also aware of other companies that may pursue
commercialization of products which may compete with Target's products and may
result in pricing and margin pressures within this market. There can be no
assurance that these companies will not succeed in developing technologies and
products that are more effective than any which have been or are being developed
by Target or that would render Target's technologies or products obsolete or not
competitive.
 
     The cardiovascular and peripheral vascular interventional markets are
substantially more developed than the neuroradiology market and are subject to
intense competition. There are many large companies with significantly greater
financial, manufacturing, marketing, distribution and
 
                                       15
<PAGE>   18
 
technical resources, and experience than Target focusing principally on
cardiovascular and peripheral applications for their catheter technologies. As a
result, Target focuses its product development and marketing strategies on
market segments where Target's small vessel access and delivery systems can be
used in applications not presently addressed by conventional catheter and other
interventional products. There can be no assurance, however, that competitors
will not successfully enter these markets with superior products. In addition,
Target is aware of several other companies that have introduced guidewires to
the marketplace and attributes the slower growth rate of its guidewire product
line to increased competitive pressures. Such competition could have a material
adverse effect on Target's business, financial condition and results of
operations. See "Business of Target -- Competition."
 
     Patents and Proprietary Technology.  The medical device market is
characterized by substantial litigation regarding patent and other intellectual
property rights. Target is aware of certain United States patents with which
certain of Target's current or proposed products may be in conflict. Two United
States patents held by third parties may cover certain of Target's
micro-catheter products. With respect to one of these patents, based upon
Target's analysis with the assistance of its patent counsel, Target believes
that such patent is invalid. With respect to the other of these patents,
although Target has not obtained a formal opinion of counsel, Target believes
that it has available defenses to a claim of infringement with respect to such
patent. However, the invalidity of any particular patent and the availability of
Target's defenses must be determined by a court in the event of litigation, and
no assurance can be given that any dispute will be resolved in a manner
satisfactory to Target. With respect to another patent that may cover one
element in the fabrication of a particular guidewire product and one potential
guidewire product, Target has designed a guidewire product that Target believes
avoids the risk of infringement. However, Target has continued and expects to
continue to market the existing guidewire product for the foreseeable future.
The above-described patents are held by large companies, each of which has
substantial resources, and no assurance can be given that such companies will
not be successful in maintaining the validity of their patents. If legal action
is commenced against Target to enforce these patents and the plaintiff in such
action prevails, Target could be prevented from practicing the subject matter
claimed in such patents. In such event or under other appropriate circumstances,
Target may attempt to obtain licenses to such patents or redesign its products.
Target is also aware that certain of its products under development may be
covered by existing patents, in which event Target may be required to obtain
licenses prior to the introduction and commercial shipment of such products.
There can be no assurance that such licenses will be available or, if available,
will be available on terms acceptable to Target, or that Target will be
successful in any attempt to redesign its products or processes to avoid
infringement. Moreover, there can be no assurance that Target has identified all
patents that may pose a risk of infringement by Target's current or proposed
products. Target's business, future operating results and financial condition
could be materially and adversely affected if its products are found to infringe
any of these patents. Target has depended and will continue to depend
substantially on its technological expertise in the development and manufacture
of its current and future products. In addition, Target depends and will likely
continue to depend on trade secret protection and on various patents, such as
its patent covering the variable stiffness shaft design of its micro-catheters,
to strengthen its proprietary position. There can be no assurance that Target
will be successful in the future in obtaining patents or that patents will not
be challenged by third parties. There can be no assurance that measures to
protect trade secrets will be successful, or that others will not independently
develop similar products, duplicate any of Target's products, or design around
any patents owned or licensed by Target. Litigation, which could result in
substantial costs to and diversion of effort by management of Target, may be
necessary to enforce patents issued to Target, to protect trade secrets or
know-how owned by Target or to defend Target against claimed infringement of the
rights of others and to determine the scope and validity of the patents or other
proprietary rights of other entities. The resolution of these claims generally
involves complex legal and factual questions and is highly uncertain. Adverse
determinations in any litigation could subject Target to significant liabilities
to third parties, require Target to seek licenses from third parties and prevent
Target from
 
                                       16
<PAGE>   19
 
manufacturing and selling its products, any of which could have a material
adverse effect on Target's business, financial condition and results of
operations. See "Business of Target -- Patents, Trade Secrets and Licenses."
 
     The patent which relates to the variable stiffness design of Target's
Tracker micro-catheters (the "Tracker patent") has been the subject of
reexamination proceedings in the United States Patent and Trademark Office
("PTO"). The first such proceeding concluded on November 15, 1994, when the PTO
issued a reexamination certificate and confirmed the patentability of the patent
claims set forth in the certificate. The second reexamination of the patent was
initiated by one of Target's competitors, SciMed Life Systems, Inc. ("SciMed") a
subsidiary of Boston Scientific Corporation, raising new issues of
patentability. A petition for a third reexamination was filed recently by the
same competitor alleging another issue of patentability and requiring the merger
with the second reexamination. Both proceedings are currently pending in the
PTO. No assurance can be given that the PTO will issue a reexamination
certificate confirming the patentability of the patent claims, or that the
patent claims will not be amended in ways that will reduce any competitive
advantages the Tracker patent has provided for Target's products.
 
     During the last half of calendar 1994, Target learned that two of its
United States competitors had commenced sales in the United States of
micro-catheters that Target believes infringe the Tracker patent. On November 9,
1994, Target filed a lawsuit against SciMed and Cordis Endovascular Systems,
Inc. in the United States District Court in San Jose, seeking damages and
preliminary and permanent injunctive relief against further infringing sales.
The defendants responded, challenging the validity of the Tracker patent,
denying infringement, and raising other defenses. The Court has stayed the
lawsuit until the pending reexamination proceedings have been completed in the
PTO. There can be no assurance that Target will be successful in this action or
that even if Target receives a favorable ruling in the pending reexamination,
the defendants will not prevail in this lawsuit.
 
     Target is also aware that at least one competitor in Europe has sold
micro-catheters that may infringe a patent that could issue on Target's patent
application which is pending in the European Patent Office. Target is
investigating its options for enforcement of its rights with respect to such
infringement. The patent which relates to the variable stiffness design of
Target's Tracker micro-catheter is being opposed in Japan by an undisclosed
party.
 
     Importance of Foreign Sales.  Export product sales outside of the United
States were 61%, 60% and 69% of product sales, respectively, for the fiscal
years ended March 31, 1993 and 1994 and for the nine months ended December 31,
1994. Target anticipates that product sales to customers in Europe and Japan
will generate a majority of total product sales through at least fiscal year
1996. Fluctuations in the value of foreign currencies relative to the U.S.
dollar could adversely affect Target's sales and results of operations from time
to time. Target's international operations are also subject to certain other
risks common to foreign operations in general, including governmental
regulations and import and export restrictions. Changes in such governmental
regulations or import and export restrictions could adversely affect sales of
Target's products and Target's results of operations.
 
     Third-Party Reimbursement.  Target's products are purchased by hospitals,
which, in the United States, then bill various third-party payors including
Medicare, Medicaid and private insurers for the healthcare services provided to
patients. Government agencies reimburse hospitals for medical procedures at a
fixed rate according to diagnosis-related groups. Federal and state laws and
regulations govern reimbursement by such government agencies. Such laws and
regulations also influence reimbursement of medical fees by private insurance
companies. Changes in current policies could reduce or eliminate such
reimbursements and thereby adversely affect future sales of Target's products.
In addition, third-party payors may deny reimbursement if they determine that
the device used in the procedure is unnecessary, inappropriate, not
cost-effective, experimental or for a non-approved indication. Third-party
payors may deny reimbursement for treatments using Target's products, regardless
of the FDA clearance status of such products. Third-party payors are
increasingly challenging the prices charged for medical products and services.
There can be no assurance
 
                                       17
<PAGE>   20
 
that reimbursement from third-party payors will be available, or if available,
that reimbursement will not be limited, thereby adversely affecting Target's
ability to sell its products profitably. Although Target has not experienced any
problems to date, significant uncertainty exists as to the reimbursement status
of newly approved healthcare products, and there can be no assurance that
adequate third-party coverage will be available to patients. In such event,
sales of Target's products could be adversely affected.
 
     Dependence on Key Personnel.  Target is dependent upon a limited number of
key management and technical personnel. Target's future success will depend in
part upon its ability to attract and retain highly qualified personnel. Target
competes for such personnel with other companies, academic institutions,
government entities and other organizations. There can be no assurance that
Target will be successful in hiring or retaining qualified personnel. The loss
of key personnel or the inability to hire or retain qualified personnel could
have a material adverse effect on Target's business, financial condition and
results of operations. See "Business of Target -- Employees."
 
     Control By Collagen.  As of March 15, 1995, Collagen owned 2,124,194 shares
of Target Common Stock, representing approximately 30% of the outstanding shares
of Target Common Stock. Prior to any exchange of Notes for Target Common Stock,
Collagen will continue to own the shares of Common Stock issuable upon exchange
of the Notes, and will continue to exercise all rights, including voting rights,
incident to such ownership. Accordingly, Collagen has sufficient voting power to
significantly influence the outcome of matters submitted to Target's
stockholders for approval. As a result, Collagen may have the power to influence
any potential proxy contest, merger, tender offer, open-market repurchase
program or other purchases of Target Common Stock that could result in a change
of the composition of the Exchange Property or give the holders of Target Common
Stock the opportunity to realize a premium over the then prevailing market price
for shares of Target Common Stock. In addition, two members of Target's Board of
Directors, Howard D. Palefsky and William G. Davis, are also directors of
Collagen, and Mr. Palefsky also is an officer of Collagen, and Collagen thereby
may be able to exercise additional control over Target's affairs. See
"Beneficial Ownership of Target Common Stock By Collagen and Certain Other
Relationships" and "Underwriting."
 
     Single Manufacturing Facility.  All of Target's manufacturing capacity is
located in a single facility. An earthquake, fire or other similar calamity
could result in significant disruptions and delays in Target's manufacturing and
distribution process. Target currently maintains only limited amounts of certain
finished product inventory, and Target's business, financial position and
results of operations could be materially adversely affected in such event.
 
     Future Sales of Target Common Stock.  Future sales of Target Common Stock
in the public market could adversely affect prevailing market prices of the
Target Common Stock and, as a result, the trading price of the Notes offered
hereby. Substantially all of the outstanding shares of Target Common Stock are
freely tradeable in the open market, subject only in the case of affiliates of
Target to the volume and other limitations of Rule 144 under the Securities Act.
Collagen, Target and executive officers and directors of Collagen and Target
have agreed subject to certain limited exceptions not to offer to sell, contract
to sell or otherwise sell or dispose of any shares of Target Common Stock, any
options or warrants to purchase Target Common Stock, or any securities
convertible into or exchangeable for shares of Target Common Stock for a period
of 90 days following the date of this Prospectus, without the prior written
consent of the Underwriter. Collagen has in the past sold and expects to
continue to sell shares of Target Common Stock in the open market or otherwise,
subject to the limitations of Rule 144 and Collagen's agreement with the
Underwriter to refrain from sales of Target Common Stock for a period of 90 days
after the date of this Prospectus. Such sales may have the effect of depressing
the trading price of Target's Common Stock. See "Beneficial Ownership of Target
Common Stock By Collagen and Certain Other Relationships" and "Underwriting."
 
                                       18
<PAGE>   21
 
                                USE OF PROCEEDS
 
     The net proceeds to Collagen from the sale of the Notes offered hereby are
estimated to be $38,275,000 ($43,125,000 if the Underwriter's over-allotment
option is exercised in full), after deduction of estimated underwriting
discounts and commissions and estimated offering expenses payable by Collagen.
The net proceeds will be used for additions to working capital, equity and debt
investments in affiliated companies and other strategic alliances, research and
new product development activities, the purchase or financing of capital
equipment and leasehold improvements, and other general corporate purposes.
Collagen also may use a portion of the proceeds to repurchase shares of its
Common Stock in the open-market or otherwise under a stock repurchase program
that has been approved by Collagen's Board of Directors. The actual timing and
amount of such repurchases, if any, have not been determined. In addition,
Collagen may use a portion of the proceeds for the acquisition of technologies
or businesses complementary to Collagen's business, although no such
transactions are currently pending. Pending such uses, Collagen intends to
invest such funds in short-term, interest-bearing obligations. Target will not
receive any of the proceeds from the sale of the Notes.
 
                           CAPITALIZATION OF COLLAGEN
 
     The following table sets forth the capitalization of Collagen and its
consolidated subsidiaries at December 31, 1994, and as adjusted to give effect
to the net proceeds from the sale of the Notes offered hereby.
 
<TABLE>
<CAPTION>
                                                                       ACTUAL      AS ADJUSTED
                                                                      --------     -----------
<S>                                                                   <C>          <C>
                                                                           (IN THOUSANDS)
Long-term obligations(1):
     % Exchangeable Subordinated Notes due 2002.....................  $     --       $40,000
Stockholders' equity:
  Preferred Stock, $0.01 par value, 5,000,000 shares authorized, no
     shares issued and outstanding..................................        --            --
  Common Stock, $0.01 par value, 28,950,000 shares authorized;
     10,466,346 shares issued and outstanding(2)....................       105           105
Additional paid-in capital..........................................    62,837        62,837
Cumulative translation adjustment...................................      (839)         (839)
Retained earnings...................................................    12,740        12,740
Treasury stock, at cost, 1,200,000 shares...........................   (26,971)      (26,971)
                                                                      --------     -----------
  Total stockholders' equity........................................    47,872        47,872
                                                                      --------     -----------
     Total capitalization...........................................  $ 47,872       $87,872
                                                                      =========    ==========
</TABLE>
 
---------------
(1) Collagen currently does not have any long-term debt. See Note 4 of Notes to
    Consolidated Financial Statements of Collagen for information about
    Collagen's commitments.
 
(2) Does not include approximately 102,000 shares of Common Stock available for
    issuance pursuant to Collagen's employee stock purchase plan and up to
    approximately 754,000 shares of Common Stock available for issuance pursuant
    to Collagen's stock option plans, of which approximately 1,223,000 shares of
    Common Stock were issuable upon exercise of options outstanding at December
    31, 1994.
 
                                       19
<PAGE>   22
 
                       PRICE RANGE OF TARGET COMMON STOCK
                              AND DIVIDEND POLICY
 
     Target Common Stock has been traded on the Nasdaq National Market under the
symbol "TGET" since Target's initial public offering in January 1992. The
following table presents the high and low closing sale prices reported by Nasdaq
for the calendar quarters indicated. These prices do not include retail markups,
markdowns or commissions and may not reflect actual transactions.
 
<TABLE>
<CAPTION>
                                                                               HIGH        LOW
                                                                              ------      ------
<S>                                                                           <C>         <C>
1992
First Quarter (from January 24, 1992)....................................     $31 5/8     $22 3/4
Second Quarter...........................................................         23      16 3/4
Third Quarter............................................................         28      19 3/4
Fourth Quarter...........................................................         28      18 3/4
1993
First Quarter............................................................     $27 3/4     $18 1/4
Second Quarter...........................................................     24 3/4      17 3/4
Third Quarter............................................................     25 1/4      21 1/8
Fourth Quarter...........................................................     22 1/4          14
1994
First Quarter............................................................     $26 1/4     $16 1/2
Second Quarter...........................................................     26 1/2      20 1/2
Third Quarter............................................................     30 1/4      19 3/4
Fourth Quarter...........................................................     32 1/4      23 3/4
1995
First Quarter (through March 22, 1995)...................................     $39 1/4     $27 3/8
</TABLE>
 
     On March 22, 1995, the last sale price of Target Common Stock on the Nasdaq
National Market was $36.00 per share. As of March 15, 1995, there were
approximately 150 holders of record of Target Common Stock.
 
     Target has not historically paid cash dividends, with the exception of a
$7.0 million dividend to Collagen and other holders of record of Target's
Preferred Stock as of January 15, 1992. Target currently intends to retain any
future earnings for use in its business and does not anticipate paying any
further cash dividends in the foreseeable future. Target's line of credit
prohibits the payment of cash dividends.
 
                                       20
<PAGE>   23
 
                SELECTED CONSOLIDATED FINANCIAL DATA OF COLLAGEN
 
    The consolidated statement of operations data of Collagen set forth below
for the fiscal years ended June 30, 1992, 1993 and 1994 and the consolidated
balance sheet data at June 30, 1993 and 1994 are derived from, and are qualified
by reference to, the audited consolidated financial statements included
elsewhere herein. The consolidated statement of operations data for the fiscal
years ended June 30, 1990 and 1991 and the consolidated balance sheet data at
June 30, 1990, 1991 and 1992 are derived from audited consolidated financial
statements not included in this Prospectus. The consolidated statement of
operations data for the six month periods ended December 31, 1993 and 1994, and
the consolidated balance sheet data at December 31, 1994 have been derived from
unaudited interim condensed financial statements included elsewhere herein and
reflect, in management's opinion, all adjustments, consisting only of normal
recurring adjustments, necessary for a fair presentation of the results of
operations for such periods. Results of operations for any interim period are
not necessarily indicative of results to be expected for the full fiscal year.
 
<TABLE>
<CAPTION>
                                                                                                              SIX MONTHS ENDED
                                                                      YEARS ENDED JUNE 30,                      DECEMBER 31,
                                                      ----------------------------------------------------   -------------------
                                                        1990       1991     1992(1)      1993       1994       1993       1994
                                                      --------   --------   --------   --------   --------   --------   --------
<S>                                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues:
  Product sales.....................................  $ 49,404   $ 61,282   $ 65,782   $ 49,743   $ 64,552   $ 30,238   $ 34,302
  Other.............................................       500        100      1,400         --      1,000      1,000      1,000
                                                      --------   --------   --------   --------   --------   --------   --------
                                                        49,904     61,382     67,182     49,743     65,552     31,238     35,302
Costs and expenses:
  Cost of sales.....................................    10,878     15,073     22,759     15,659     18,940      8,590      9,216
  Research and development..........................     8,498      8,954     12,023      8,767      9,366      4,565      5,038
  Selling, general and administrative...............    18,495     28,698     38,694     29,176     28,639     14,292     15,331
                                                      --------   --------   --------   --------   --------   --------   --------
                                                        37,871     52,725     73,476     53,602     56,945     27,447     29,585
                                                      --------   --------   --------   --------   --------   --------   --------
Income (loss) from operations.......................    12,033      8,657     (6,294)    (3,859)     8,607      3,791      5,717
Other income (expense):
  Net gain from investments, principally Target.....        --         --      9,439     20,323         --         --        775
  Equity in earnings (losses) of affiliates.........        --         --        (32)       968       (269)       (37)      (369)
  Interest income...................................       570      1,080      1,586        880        510        283        215
  Interest expense..................................      (983)    (1,000)      (796)        --         --         --        (55)
                                                      --------   --------   --------   --------   --------   --------   --------
Income before income taxes..........................    11,620      8,737      3,903     18,312      8,848      4,037      6,283
Provision for income taxes..........................     4,685      3,492      1,262      8,580      3,928      2,000      2,731
Minority interest in earnings of Target.............        62        132      1,233         --         --         --         --
                                                      --------   --------   --------   --------   --------   --------   --------
Income from continuing operations...................     6,873      5,113      1,408      9,732      4,920      2,037      3,552
Loss from discontinued operations, net of tax.......    (2,778)    (9,462)      (261)        --         --         --         --
                                                      --------   --------   --------   --------   --------   --------   --------
Income before cumulative effect of accounting
  change............................................     4,095     (4,349)     1,147      9,732      4,920      2,037      3,552
Cumulative effect of change in method of accounting
  for income taxes..................................        --         --         --       (989)        --         --         --
                                                      --------   --------   --------   --------   --------   --------   --------
Net income (loss)...................................  $  4,095   $ (4,349)  $  1,147   $  8,743   $  4,920   $  2,037   $  3,552
                                                      ========   ========   ========   ========   ========   ========   ========
Income (loss) per share:
  Continuing operations.............................  $    .77   $    .53   $    .14   $    .95   $    .50   $    .20   $    .37
  Discontinued operations...........................      (.31)      (.98)      (.03)        --         --         --         --
  Cumulative effect of accounting change............        --         --         --       (.10)        --         --         --
                                                      --------   --------   --------   --------   --------   --------   --------
    Net income (loss) per share.....................  $    .46   $   (.45)  $    .11   $    .85   $    .50   $    .20   $    .37
                                                      ========   ========   ========   ========   ========   ========   ========
Shares used in calculating per share information....     8,937      9,710     10,232     10,267      9,896     10,031      9,517
                                                      ========   ========   ========   ========   ========   ========   ========
Cash dividends per share(2).........................        --         --         --         --   $    .10         --   $   .075
                                                      ========   ========   ========   ========   ========   ========   ========
Ratio of earnings to fixed charges(3)...............       7.8x       4.9x       2.6x      12.1x       6.9x       6.4x       8.5x
                                                      ========   ========   ========   ========   ========   ========   ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                           JUNE 30,
                                                 -------------------------------------------------------------   DECEMBER 31,
                                                   1990         1991         1992         1993         1994          1994
                                                 ---------    ---------    ---------    ---------    ---------   ------------
<S>                                              <C>          <C>          <C>          <C>          <C>         <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital...............................   $  28,556    $  20,264    $  50,747    $  24,557    $  16,227     $ 13,580
Total assets..................................      70,804       67,591       95,479       76,206       74,505       73,726
Long-term obligations.........................      12,750        9,350           --           --           --           --
Stockholders' equity..........................      44,207       37,798       57,174       54,936       49,082       47,872
</TABLE>
 
---------------
 
(1) As a result of the sale of a portion of Collagen's shares of Target in
   fiscal 1993, Collagen's ownership position in Target decreased to 34% in
   December 1992. The fiscal 1994 and 1993 financial information is presented
   with Target accounted for under the equity method. All previous years contain
   consolidated results of Target. See Notes 1 and 3 of Notes to Consolidated
   Financial Statements of Collagen. Gains from Collagen's investment in Target
   contributed $20,323,000 ($1.98 per share) to fiscal 1993 earnings and
   $10,239,000 ($1.00 per share) to fiscal 1992 earnings.
(2) The Board of Directors currently expects to review semiannually the
   potential for future dividends.
(3) The ratios of earnings to fixed charges were calculated by dividing the sum
   of (i) consolidated pretax income from continuing operations, (ii) adjustment
   to exclude the net equity income or loss of less than 50% owned affiliates
   and (iii) fixed charges, by fixed charges. Fixed charges consist of expensed
   interest and the estimated interest portion of rent expense.
 
                                       21
<PAGE>   24
 
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                CONDITION AND RESULTS OF OPERATIONS OF COLLAGEN
 
     The following discussion should be read in conjunction with Collagen's
consolidated financial statements, notes thereto and discussion thereof
incorporated by reference herein.
 
OVERVIEW
 
     Collagen's revenues have been derived primarily from the sale of products
principally used in reconstructive and cosmetic applications for the face, the
treatment of stress urinary incontinence, and in bone repair. Collagen markets
its reconstructive and cosmetic products directly and through a network of
international distributors and its stress urinary incontinence and bone repair
products through marketing partners.
 
     In addition to joint development arrangements, Collagen has an active
program for developing new products through affiliated companies in which
Collagen makes equity and debt investments. Collagen believes the formation of
new companies allows each to focus its technology on select market segments to
bring products to market efficiently and to expand its proprietary knowledge.
Collagen funded Target as an affiliated company in 1985.
 
IMPACT OF TARGET ON FISCAL 1992 HISTORICAL RESULTS
 
     Collagen reduced its equity interest in Target as a result of the sale of
stock held in Target in January and December 1992. Collagen's ownership
percentage in Target decreased from approximately 87% at June 30, 1991 to
approximately 52% at the end of fiscal 1992 and to approximately 34% by December
31, 1992. As of December 31, 1994, Collagen's ownership percentage in Target was
approximately 32%. Gains from Collagen's investment in Target were $20.3 million
in fiscal 1993 and $10.2 million in fiscal 1992. Beginning in fiscal 1993,
Collagen's investment in Target has been accounted for under the equity method
as a result of the reduced ownership position at December 1992. In fiscal 1992
and prior years, Target was a consolidated subsidiary of Collagen. Target's
product sales in fiscal 1992 were $21.1 million, representing 32% of Collagen's
consolidated 1992 product sales of $65.8 million. Other revenues of $1.4 million
in fiscal 1992 represented payments received by Target under the terms of the
research and development arrangement between Target and Century Medical, Inc.,
Target's joint venture partner in Japan.
 
     Target's contribution to consolidated net income on an equity basis was
approximately $1.0 million in fiscal 1994 and $900,000 in fiscal 1993 (excluding
the gain on the sale of a portion of Collagen's investment). These amounts
compare to a contribution to consolidated net income of $3.2 million in fiscal
1992, when Target was a consolidated subsidiary. See Note 3 of Notes to
Consolidated Financial Statements of Collagen.
 
                                       22
<PAGE>   25
 
RESULTS OF OPERATIONS
 
     The following table sets forth for the periods indicated certain selected
statement of operations information of Collagen as a percentage of product sales
for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                                          SIX MONTHS
                                                                                             ENDED
                                                          YEARS ENDED JUNE 30,           DECEMBER 31,
                                                      ----------------------------     -----------------
                                                       1992       1993       1994       1993       1994
                                                      ------     ------     ------     ------     ------
<S>                                                   <C>        <C>        <C>        <C>        <C>
Product sales.....................................       100%       100%       100%       100%       100%
Other revenue.....................................        --         --          2          3          3
Cost and expenses:
  Cost of sales...................................        34         31         29         28         27
  Research and development........................        15         18         15         15         15
  Selling, general and administrative.............        73         59         44         47         45
Income (loss) from operations.....................       (22)        (8)        13         13         17
</TABLE>
 
  COMPARISON OF ANNUAL AND SIX-MONTH RESULTS OF OPERATIONS
 
     Management believes that a comparison of fiscal 1994 and 1993 operating
results to the previously reported fiscal 1992 results excluding Target is more
meaningful. Accordingly, the following discussion and all charts exclude the
results of Target in all areas other than equity in earnings and losses of
affiliate companies.
 
     Product Sales.  Product sales of $64.6 million in fiscal 1994 increased
$14.9 million or 30% over prior year sales of $49.7 million, which in turn
increased $5.0 million or 11% over fiscal 1992 sales of $44.7 million. The $14.9
million increase in fiscal 1994 is principally attributable to new products,
primarily Contigen Implant, Collagraft Implant and Collagraft Strip. The $5.0
million increase in fiscal 1993 was principally from $4.4 million of product
sales from shipping initial stocking orders of Contigen Implant. Product sales
of $34.3 million in the six months ended December 31, 1994 increased $4.1
million, or 13%, over the same prior-year period.
 
     Fiscal 1994 worldwide sales of plastic surgery and dermatological products
were $43.5 million or 2% lower than fiscal 1993 sales of $44.2 million, compared
to a 1% increase in fiscal 1993 over fiscal 1992 sales of $43.7 million. U.S.
sales of plastic surgery and dermatological products, representing slightly more
than 50% of worldwide sales, remained relatively flat from year to year.
Collagen believes the lack of growth in demand was primarily due to competition
from alternative cosmetic procedures such as chemical peels, as well as the
lingering effects of adverse publicity in prior years from the news media on
cosmetic procedures in general and to regulatory investigations specific to
Collagen.
 
     For the six months ended December 31, 1994, worldwide sales of plastic
surgery and dermatological products were $24.3 million, up 17% from sales of
$20.9 million for the same prior-year period. U.S. sales of plastic surgery and
dermatological products were $12.7 million for the six-month period ended
December 31, 1994, representing 52% of worldwide sales for such period and an
increase of 15% over U.S. sales of $11 million for the same prior-year period.
The increase in sales in the current fiscal year was primarily due to a price
increase which was effective February 1994 as well as increases in unit sales
which may be attributable to an increase in advertising and public relations
campaigns, and increased physician interest in cosmetic procedures not
reimbursed by third party payors.
 
     International unit sales of plastic surgery and dermatological products
increased approximately 8% in fiscal 1994 over the prior year, while fiscal 1993
unit sales decreased by 6% from fiscal 1992. For the six months ended December
31, 1994, international unit sales of plastic surgery and dermatological
products increased 19% over the same prior-year period. Collagen believes the
turnaround in international unit sales in fiscal 1994 and in the current fiscal
year periods are a result
 
                                       23
<PAGE>   26
 
of successful marketing and public relations efforts, as well as strong
distributor sales and a recovery from recessionary economic conditions in
Europe. International sales in dollars were negatively impacted by unfavorable
foreign exchange rates in fiscal 1994 by approximately $1.6 million compared to
fiscal 1993, and in fiscal 1993 by approximately $380,000 compared to fiscal
1992; however, international sales in dollars were favorably impacted by
approximately $620,000 in the six months ended December 31, 1994, due to
favorable foreign exchange rates, compared with the same prior-year period. See
" -- Operating Income." Collagen expects growth in future worldwide demand for
its plastic surgery and dermatological products to continue, but at a lower
rate.
 
     In September 1993, Collagen and its marketing partner, Bard, received final
clearance from the FDA to market Contigen Implant, resulting in sales of
Contigen Implant to Bard of $15.9 million and income of $789,000 from Bard's
direct sales to physicians during fiscal 1994 compared to $4.4 million of sales
of Contigen Implant to Bard in fiscal 1993. There were no sales of Contigen
Implant in fiscal 1992. For the six months ended December 31, 1994, product
sales of Contigen Implant to Bard were $8.1 million, which consisted of
shipments of Contigen Implant of $6.6 million and income from Bard's direct
sales of Contigen Implant to physician customers of approximately $1.5 million,
compared with product sales of $8.1 million for the same prior year period,
which consisted of shipments of Contigen Implant only. Collagen did not record
any income from Bard's direct sales of Contigen Implant to physician customers
in the same prior-year periods since Bard's direct sales of the product to
physician customers commenced late in the prior-year second quarter. Under an
agreement between Collagen and Bard, Bard agreed to make certain minimum
purchases of Contigen Implant products, and Bard currently has significant
inventory of these products. No minimum purchases are required under this
agreement after June 30, 1995, and there can be no assurance that Bard's
purchases of Contigen Implant will not decrease thereafter to the extent that
Bard seeks to reduce its Contigen Implant inventory levels. Any significant
decrease in such purchases could have a material adverse effect on Collagen's
operating results. While Collagen intends to pursue further agreements regarding
future shipment levels of Contigen Implant to Bard, there can be no assurances
that such agreements can be reached. During the quarter ended December 31, 1994,
Collagen's share of sales made by Bard to physician customers increased from 5%
to 10%, pursuant to the terms of an agreement between Collagen and Bard. Future
income from Bard's direct sales of Contigen Implant to physician customers is
expected to increase, but is uncertain and may fluctuate significantly due to
market demand.
 
     Fiscal 1994 represented the first full fiscal year of Collagraft Implant
sales. In January 1994, Collagen and its marketing partner, Zimmer, received
clearance from the FDA to market Collagraft Strip, a second-generation product
for the treatment of acute long bone fractures and traumatic osseous (bony)
defects. Combined sales of Collagraft Implant and Collagraft Strip to Zimmer
totaled $2.7 million in fiscal 1994 compared to sales of Collagraft Implant of
$150,000 in fiscal 1993. There were no sales of Collagraft Implant or Collagraft
Strip in fiscal 1992. For the six months ended December 31, 1994, sales of
Collagraft Implant and Collagraft Strip to Zimmer were $1.6 million, compared to
sales of Collagraft Implant of approximately $700,000 to Zimmer in the same
prior-year period. The increase in the current fiscal year was primarily due to
sales of Collagraft Strip in the current fiscal period, whereas there were no
sales of that product during the same prior-year period. Due to higher than
expected shipments to Zimmer in the quarter ended September 30, 1994, Collagen
expects sales of Collagraft Implant and Collagraft Strip in the fiscal quarter
ending March 31, 1995 to be at a level similar to those reported in the quarter
ended December 31, 1994.
 
     A number of uncertainties exist surrounding the marketing and distribution
of Collagen's new products, Contigen Implant, Collagraft Implant and Collagraft
Strip. Collagen's primary means of distribution for these products is through
third party firms, Bard, in the case of Contigen Implant, and Zimmer, in the
case of Collagraft Implant and Collagraft Strip. Collagen's business and
financial results could be adversely affected in the event that either or both
of these parties, or Collagen, are unable to effectively market the products,
accurately anticipate customer demand, or effectively manage industry-wide
pricing and cost containment pressures in health care.
 
                                       24
<PAGE>   27
 
     Other Revenue.  Other revenue recorded in fiscal 1994 consisted of a $1.0
million milestone payment from Bard earned upon receipt of clearance from the
FDA to market Contigen Implant. Other revenue in the six months ended December
31, 1994 and 1993 consisted of milestone payments of $1 million each from Bard
in accordance with an agreement between Collagen and Bard. Under the agreement,
Bard is scheduled to pay a final milestone payment of $2 million to Collagen on
September 30, 1995.
 
     Cost of Sales.  Cost of sales as a percentage of product sales averaged
29%, 31% and 34% in fiscal 1994, 1993 and 1992, respectively. The decrease in
cost of sales as a percentage of product sales reflected slightly lower unit
costs due to increased production volume, primarily from Contigen Implant. This
was partially offset by the effect of the lower gross margins from sales of
Contigen Implant, which are attributable to the marketing and distribution
arrangement with Bard. Cost of sales as a percentage of product sales was 27%
for the six months ended December 31, 1994, compared with 28% for the same
prior-year period. The lower cost of sales as a percentage of product sales in
the current fiscal year period was primarily due to increased product revenues
resulting from income received from Bard's direct sales of Contigen Implant to
physician customers, which lowered the cost of sales as a percentage of product
sales, as well as the favorable impact of foreign exchange rates on
international product sales. Due to the high fixed costs of Collagen's
manufacturing facility, unit cost of sales is expected to remain highly
dependent on maintaining current level of output at Collagen's manufacturing
facility, which is heavily dependent on production of Contigen Implant. Changes
in cost of sales as a percentage of sales are dependent on the product mix of
future sales for which demand and pricing characteristics may vary.
 
     Research and Development.  Research and Development ("R&D") expenses, which
include expenditures for regulatory compliance, were $9.4 million (15% of
product sales) in fiscal 1994, $8.8 million (18% of product sales) in fiscal
1993, and $6.9 million (15% of product sales) in fiscal 1992. The increases in
R&D expenses over the past two years were primarily attributable to Collagen
devoting additional resources to expand its capabilities in collagen-based
technologies through the hiring of additional personnel and the expansion of its
facilities. R&D expenses were $5.0 million for the six months ended December 31,
1994, an increase of 10% over the same prior year period. The increase in R&D
spending in the current fiscal year was primarily attributable to advancements
in soft tissue programs, including clinical trials for Zyplast II Implant, a
concentrated collagen material for soft tissue augmentation. Collagen expects
R&D spending for fiscal 1995 to be at a level slightly higher than that of the
prior year.
 
     Selling, General and Administrative.  Selling, general and administrative
("SG&A") expenses totaled $28.6 million in fiscal 1994, $29.2 million in fiscal
1993 and $32.6 million in fiscal 1992, representing 44%, 59% and 73% of product
sales, respectively. The $600,000, or 2%, decrease in fiscal 1994 from fiscal
1993 was primarily due to lower commission expenses related to international
sales and lower promotional expense for the U.S. plastic surgery and
dermatological products, partially offset by increased personnel costs. The $3.4
million, or 11%, decrease in fiscal 1993 from fiscal 1992 was primarily due to
the high level of expenses incurred in the prior year to respond to both
legislative and regulatory investigations, and negative publicity about plastic
surgery and dermatological products and other cosmetic procedures, as well as
costs incurred in connection with product liability lawsuits. SG&A expenses were
$15.3 million for the six months ended December 31, 1994, compared with $14.3
million in, or an increase of 7% over, the same prior-year period. The increase
in the current fiscal year period was primarily due to higher international
spending and an unfavorable impact of foreign exchange rates, partially offset
by lower U.S. advertising and public relation campaign expenses. SG&A expenses
as a percentage of product sales were 45% for the six months ended December 31,
1994, compared to 47% for the same prior-year period. Collagen expects SG&A
spending in the full fiscal 1995 year to be at levels comparable to fiscal 1994.
 
     Operating Income.  Operating income was $8.6 million in fiscal 1994,
compared to operating losses of $3.9 million and $9.9 million in fiscal 1993 and
fiscal 1992, respectively. The increase in
 
                                       25
<PAGE>   28
 
operating income over the past two years is primarily the result of increased
sales of Contigen Implant, Collagraft Implant and Collagraft Strip, as well as
decreased SG&A expenses. Operating income was $5.7 million for the six months
ended December 31, 1994, compared with $3.8 million in, or an increase of 51%
over, the same prior-year period. The increase in operating income in the
current fiscal year period was primarily due to higher product sales, partially
offset by higher operating expenses.
 
     Compared with foreign exchange rates for the same prior-year period, the
impact of foreign exchange rates in the six months ended December 31, 1994 on
operating income was a net increase of $170,000, resulting from an increase of
approximately $620,000 in revenue on equivalent local currency sales, partially
offset by an increase of approximately $450,000 in operating expenses.
 
     Gain on Sale of Target Common Stock.  In November 1994, Collagen sold
35,000 shares of the common stock of Target for a pre-tax gain of approximately
$775,000.
 
     Equity in Earnings (Losses) of Affiliate Companies.  Equity in losses of
affiliate companies in fiscal 1994 was $269,000 compared to equity in earnings
of affiliates of $968,000 in fiscal 1993. The losses in fiscal 1994 were
primarily due to increased losses from affiliates and increased ownership
percentages in certain of those affiliates, partially offset by increased equity
in earnings of Target. Equity in losses of affiliates in fiscal 1994 consisted
of approximately $1.7 million of earnings from Target, offset by approximately
$2.0 million of losses from other affiliates. The equity earnings in fiscal 1993
were comprised of approximately $1.5 million of earnings from Target, partially
offset by approximately $500,000 equity in losses of other affiliates. In fiscal
1992, Target was accounted for as a consolidated subsidiary and contributed
approximately $3.2 million to Collagen's consolidated net income. For the six
months ended December 31, 1994, equity in losses of affiliate companies was
$369,000, compared with losses of $37,000 in the same prior-year period. The
increase in equity in losses of affiliate companies in the six-month period in
the current fiscal year over the same prior-year period was primarily due to
increased losses recognized by affiliate companies, partially offset by
increased equity in earnings in Target. Collagen currently intends to continue
to make significant additional investments in affiliated companies. These
affiliated companies typically are in an early stage of development and may be
expected to incur substantial losses which in turn will have an adverse effect
on Collagen's operating results. Furthermore, there can be no assurance that any
investments in affiliates will result in any return nor as to the timing of such
return, or that Collagen will not lose its entire investment.
 
     Interest Income and Expense.  Interest income was $510,000 in fiscal 1994,
$880,000 in fiscal 1993 and $770,000 in fiscal 1992. The decrease in fiscal 1994
from fiscal 1993 was primarily due to lower average investment balances
resulting primarily from the repurchase of common stock and to lower interest
rates, while the increase in fiscal 1993 over fiscal 1992 was primarily due to
higher average investment balances resulting largely from the sale of a portion
of Collagen's investment in Target, despite lower interest rates during fiscal
1993 compared to fiscal 1992. Fiscal 1992 interest expense of $667,000 related
to interest on a term loan, which Collagen prepaid in March 1992. Interest
income was $215,000 for the six months ended December 31, 1994, compared with
$283,000 for the same prior-year period. The decrease in the current fiscal year
period was primarily due to lower average investment balances resulting from the
repurchase of common stock and additional investments in affiliate companies,
partially offset by slightly higher interest rates. Interest expense of $55,000
in the six months ended December 31, 1994 was related to a $7 million revolving
credit facility, which Collagen finalized with a bank in November 1994.
 
     Provision for Income Taxes.  Collagen's effective income tax rate was
approximately 44% for fiscal 1994 compared to 47% for fiscal 1993 and 32% for
fiscal 1992. The decrease in fiscal 1994 from fiscal 1993 was primarily
attributable to a reduction in unbenefited foreign subsidiary losses and the
recognition of tax credits, partially offset by an increase in non-deductible
equity losses of affiliates. The increase in fiscal 1993 over fiscal 1992 was
primarily attributable to a reduction in benefits from tax credits, non-taxable
investment gains, and export sales included in the fiscal 1992 provision. The
 
                                       26
<PAGE>   29
 
provision for income taxes for the six months ended December 31, 1994 and 1993
was computed by applying the estimated annual income tax rates of approximately
43% and approximately 49%, respectively, to income before income taxes. The
lower effective tax rate in the current fiscal year is primarily due to
increased equity in losses of affiliates which is partially offset by a change
in the mix of anticipated foreign and domestic earnings and a lower effective
state income tax rate. It is expected that the overall effective income tax rate
for fiscal 1995 will be slightly lower than for fiscal 1994. Effective July 1,
1992, Collagen prospectively changed its method of accounting for income taxes
from the deferred method to the liability method required by SFAS No. 109
"Accounting for Income Taxes." The cumulative effect of adopting SFAS No. 109
was a charge to earnings of $989,000 in the first quarter of fiscal 1993.
 
     Impact of Foreign Exchange Rates.  The impact of foreign exchange rates
from fiscal 1993 to fiscal 1994 resulted in approximately a $1.6 million
reduction in revenue on equivalent local currency sales and approximately a $1.0
million reduction in operating expenses, resulting in approximately a $600,000
net reduction in operating income on an equivalent local currency basis,
compared to a reduction of approximately $380,000 in revenue, a reduction of
approximately $170,000 in operating expenses and a net reduction of
approximately $210,000 in operating income from fiscal 1992 to fiscal 1993.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     At December 31, 1994, Collagen's cash, cash equivalents and short-term
investments were $9.6 million compared to $12.7 million at June 30, 1994. Net
cash provided by operating activities was $3.9 million for the six months ended
December 31, 1994, compared with $5.0 million provided by operating activities
for the same prior-year period. Net cash provided by operating activities was
approximately $10.7 million in fiscal 1994, compared to approximately $9.1
million used in operating activities in fiscal 1993. The improvement in cash
flow from operating activities in fiscal 1994 was primarily due to a turnaround
from an operating loss in fiscal 1993 to operating income in fiscal 1994.
Non-cash items included in net income for fiscal 1993 included the cumulative
effect of the change in accounting for income taxes of $989,000.
 
     The $3.9 million of cash provided by operating activities in the six-month
period in the current fiscal year was primarily offset by $5.5 million used to
repurchase 262,500 shares of Collagen's Common Stock at an average acquisition
price of approximately $21 per share, $2.4 million of additional investments in
affiliate companies and the payment of an aggregate cash dividend of
approximately $943,000, which was declared in June 1994, to Collagen's
stockholders in July 1994. During fiscal 1994, 567,500 shares were repurchased
at an average acquisition cost of approximately $24 per share for a total of
approximately $13.8 million. During fiscal 1993, 370,000 shares were repurchased
at an average acquisition cost of approximately $21 per share for a total of
approximately $7.6 million. Additional significant cash outflows included
capital expenditures of $4.0 million in fiscal 1994, compared to $2.5 million in
fiscal 1993. Cash invested in affiliate companies was $2.4 million in fiscal
1994, compared to $3.0 million in fiscal 1993. In January 1995 Collagen's Board
of Directors authorized the repurchase of up to an additional 300,000 shares of
Collagen Common Stock in the open market.
 
     Collagen currently anticipates capital expenditures, equity investments in,
and loans to affiliate companies to be approximately $10.0 million in fiscal
1995. Approximately $3.8 million of this amount had been expended in the six
months ended December 31, 1994. Collagen paid cash dividends of $0.10 per share
in July 1994 and $0.075 per share in January 1995, totaling $943,000 and
$694,000, respectively. Collagen anticipates that the Board of Directors will
review the possibility of declaring an additional dividend before the end of
fiscal 1995.
 
     Collagen's principal sources of liquidity include cash generated from
operations and its cash, cash equivalents and short-term investments. In
addition, during the fiscal quarter ended September 30, 1994, Collagen's Board
of Directors authorized Collagen to sell portions of its holdings of
 
                                       27
<PAGE>   30
 
approximately 2.3 million shares of Target Common Stock. On November 1, 1994,
Collagen sold 35,000 shares of its Target Common Stock for a pre-tax gain of
approximately $775,000. The pre-tax sales proceeds were approximately $1.1
million. Collagen anticipates that stock sales pursuant to the authorization
will be made from time to time, under Rule 144, with the objective of generating
cash, for, among other things, further investments in both current and new
affiliate companies. In addition, Collagen established a $7.0 million revolving
credit facility with a bank in November 1994, which Collagen has not used and
intends to terminate shortly after the closing of the sale of the Notes offered
hereby. Collagen believes that the proceeds from the sale of the Notes offered
hereby, together with other available sources of liquidity should be adequate to
fund its anticipated cash needs for the foreseeable future.
 
                                       28
<PAGE>   31
 
                 SELECTED CONSOLIDATED FINANCIAL DATA OF TARGET
 
     The consolidated statement of income data of Target set forth below for the
fiscal years ended March 31, 1992, 1993 and 1994 and the consolidated balance
sheet data at March 31, 1993 and 1994 are derived from, and are qualified by
reference to, the audited consolidated financial statements included elsewhere
herein. The consolidated statement of income data for the fiscal years ended
March 31, 1990 and 1991 and the consolidated balance sheet data at March 31,
1990, 1991 and 1992 are derived from audited consolidated financial statements
not included in this Prospectus. The consolidated statement of income data for
the nine month periods ended December 31, 1993 and 1994, and the consolidated
balance sheet data at December 31, 1994 have been derived from unaudited interim
condensed financial statements included elsewhere herein and reflect, in
management's opinion, all adjustments, consisting only of normal recurring
adjustments, necessary for a fair presentation of the results of income for such
periods. Results of operations for any interim period are not necessarily
indicative of results to be expected for the full fiscal year.
 
<TABLE>
<CAPTION>
                                                                                                            NINE MONTHS ENDED
                                                                 YEARS ENDED MARCH 31,                         DECEMBER 31,
                                                -------------------------------------------------------    --------------------
                                                 1990        1991        1992        1993        1994        1993        1994
                                                -------    --------    --------    --------    --------    --------    --------
<S>                                             <C>        <C>         <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF INCOME DATA:
Total revenues...............................   $ 8,604    $ 12,510    $ 20,449    $ 28,117    $ 35,353    $ 25,453    $ 34,497
Costs and expenses:
  Cost of sales..............................     3,001       4,558       6,920       9,657      13,368      10,103      11,060
  Research and development...................     2,044       3,129       4,347       6,496       7,624       5,468       7,472
  Selling, general and administrative........     2,683       3,580       5,447       7,543       9,245       6,886       9,645
                                                -------    --------    --------    --------    --------    --------    --------
    Total costs and expenses.................     7,728      11,267      16,714      23,696      30,237      22,457      28,177
                                                -------    --------    --------    --------    --------    --------    --------
Income from operations.......................       876       1,243       3,735       4,421       5,116       2,996       6,320
Interest income, net.........................         1         (50)        297         890         954         682         921
Other income.................................        --          --          --          16         515         276         973
                                                -------    --------    --------    --------    --------    --------    --------
Income before income taxes and cumulative
  effect of change in method of accounting
  for income taxes...........................       877       1,193       4,032       5,327       6,585       3,954       8,214
Provision for income taxes...................       294         486       1,532       1,747       2,265       1,344       2,957
                                                -------    --------    --------    --------    --------    --------    --------
Income before cumulative effect of accounting
  change.....................................       583         707       2,500       3,580       4,320       2,610       5,257
Cumulative effect of change in method of
  accounting for income taxes................        --          --          --          --         631         631          --
                                                -------    --------    --------    --------    --------    --------    --------
Net income...................................   $   583    $    707    $  2,500    $  3,580    $  4,951    $  3,241    $  5,257
                                                 ======    ========    ========    ========    ========    ========    ========
Income per share:
  Income before cumulative effect of
    accounting change........................                                      $    .51    $    .61    $    .37    $    .73
  Cumulative effect of change in method of
    accounting for income taxes..............                                            --         .09         .09          --
                                                                                   --------    --------    --------    --------
  Net income per share.......................                                      $    .51    $    .70    $    .46    $    .73
                                                                                   ========    ========    ========    ========
Pro forma net income (unaudited)(1)..........                          $  2,599
                                                                       ========
Pro forma net income per share
  (unaudited)(1).............................                          $    .51
                                                                       ========
Shares used in computing income per share and
  pro forma net income per share data........                             5,093       7,075       7,103       7,087       7,190
                                                                       ========    ========    ========    ========    ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                       MARCH 31,
                                                 ------------------------------------------------------     DECEMBER 31,
                                                  1990       1991        1992        1993        1994           1994
                                                 -------    -------    --------    --------    --------     ------------
<S>                                              <C>        <C>        <C>         <C>         <C>          <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital...............................   $ 2,269    $ 2,601    $ 34,602    $ 37,370    $ 41,527       $ 43,054
Total assets..................................     5,670      7,166      42,103      46,827      57,130         64,884
Long-term obligations.........................       140        169         138         152         124            104
Stockholders' equity..........................     3,839      4,578      37,983      42,462      49,064         55,060
</TABLE>
 
---------------
(1) See Notes 1 and 6 of Notes to Consolidated Financial Statements of Target
    for pro forma information relating to Target's Accounting for Income Taxes
    as a separate company.
 
                                       29
<PAGE>   32
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
            FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF TARGET
 
     The following discussion should be read in conjunction with Target's
consolidated financial statements, notes thereto and discussion thereof
incorporated by reference herein.
 
OVERVIEW
 
     Target's revenues have been derived primarily from the sale of its
micro-catheters, guidewires and micro-coils. Target also derives a portion of
its revenues from the distribution of certain products manufactured by other
companies pursuant to distribution agreements. Target also entered into a
research and development agreement with Century Medical, Inc. ("CMI") in March
1991, under which CMI provided $2.0 million of development funding, of which
$1.4 million was included in revenue in fiscal 1992, to assist Target in the
development of its Stealth balloon angioplasty micro-catheter. In addition,
Target entered into a management agreement, effective in January 1994, with its
Japanese joint venture in which Target was obligated to provide certain
management services for which Target was reimbursed during calendar 1994.
 
RESULTS OF OPERATIONS
 
     The following table sets forth certain selected statement of income
information of Target as a percentage of product sales for the periods
indicated.
 
<TABLE>
<CAPTION>
                                                                                       NINE MONTHS ENDED
                                                         YEARS ENDED MARCH 31,           DECEMBER 31,
                                                      ----------------------------     -----------------
                                                       1992       1993       1994       1993       1994
                                                      ------     ------     ------     ------     ------
<S>                                                   <C>        <C>        <C>        <C>        <C>
Product sales.....................................       100%       100%       100%       100%       100%
Other revenue.....................................         7         --         --         --         --
Costs and expenses:
  Cost of sales...................................        36         34         38*        40*        32
  Research and development........................        23         23         22         21         22
  Selling, general and administrative.............        29         27         26         27         28
</TABLE>
 
---------------
 
*Includes $1.5 million charge for costs associated with changes being made to
 the Guglielmi Detachable Coil system as described under Cost of Sales below.
 Cost of sales, exclusive of this charge, was 34% of product sales for both the
 fiscal year ended March 31, 1994 and the nine months ended December 31, 1993.
 
  COMPARISON OF ANNUAL AND NINE-MONTH RESULTS OF OPERATIONS
 
     Revenues.  Total revenues for the year ended March 31, 1994 were $35.4
million, an increase of $7.2 million, or 26%, from $28.1 million for the prior
year. Total revenues for the year ended March 31, 1993 increased 37% from $20.4
million in fiscal 1992. Total revenues for the year ended March 31, 1992
included $1.4 million received under the CMI research and development agreement.
Product sales of $28.1 million in fiscal 1993 represented an increase of 48%
over $19.0 million in fiscal 1992. These increases were primarily attributable
to new product introductions and additional unit sales in each of Target's
product lines resulting from an increased number of treatment sites, training of
additional physicians and the continued acceptance of Target's products. During
fiscal 1993, Target implemented a nominal price increase to certain of its
products to both domestic and international customers with the exception of its
distributor in Japan. Target currently intends to increase prices to its
Japanese distributor in fiscal 1996. See "-- Interest and Other Income."
 
                                       30
<PAGE>   33
 
     Revenues for the nine months ended December 31, 1994 were $34.5 million, an
increase of 36% compared to $25.5 million for the prior year period. The
increase was primarily attributable to the continued acceptance of new and
recently enhanced products and additional sales in each of Target's product
lines resulting from an increased number of treatment sites and the training of
additional physicians.
 
     The increase in Target's revenues is also attributable to the growing
market for Target's products in Europe and Japan. Export product sales increased
to $21.1 million in fiscal 1994 from $17.2 million in fiscal 1993 and $10.6
million in fiscal 1992. For the nine months ended December 31, 1994 export
product sales increased to $23.6 million from $15.1 million in the prior year
period. Export product sales as a percentage of total product sales were 60% in
fiscal 1994, 61% in fiscal 1993 and 56% in fiscal 1992. For the nine months
ended December 31, 1994, export product sales as a percentage of total product
sales increased to 69% from 59% in the prior year period. During fiscal 1994 and
1993, Target sold products in Japan through a joint venture formed with CMI.
Sales to the Japanese market in fiscal 1994 and 1993 accounted for approximately
29% and 27%, respectively, of product sales. Sales of Target's products in Japan
through its former distributor accounted for approximately 21% of Target's
product sales in fiscal 1992.
 
     Target's continued revenue growth is subject to a number of factors,
including new product introductions, the availability of suitable alternative
products manufactured by competitors, the timeliness and availability of
regulatory clearance and the continued expansion of its customer base. Target
continues to research and develop new applications for its products in an effort
to expand its practitioner customer base. As more companies become aware of the
market potential of such products, Target anticipates an increase of competitive
forces which may have an adverse effect on revenues of Target. Several companies
in the United States have introduced products that are being used in the
interventional neuroradiology market. Target is also aware of other companies
that may pursue commercialization of products which may compete with Target's
products and may result in future pricing and margin pressures within this
market. Prior to commercialization in the United States, sales of certain of
Target's products, including the Guglielmi Detachable Coil ("GDC") system are
limited to clinical settings pursuant to Investigational Device Exemptions
("IDE"s) granted by the FDA which limit the number of patients treatable with
such products. Target must obtain clearance from the FDA to market these
products for other than clinical investigation, and the overall review time of
such regulatory process has apparently increased. Regulatory requirements vary
in other countries in which Target markets its products. Failure to develop new
products successfully or to obtain regulatory clearance for such products,
including Target's detachable coil systems, in a timely manner may have an
adverse effect on Target's revenues in the future. Target's revenue growth may
also be adversely affected by the limited number of teaching hospitals that
train practitioners in fields in which Target's products are utilized. Target
continues to obtain a significant amount of its revenues from one customer in
Japan. Should this customer continue to represent a significant portion of
revenues, significant changes in this customer's ordering rates will likely
cause similar changes in Target's revenues. It is Target's understanding that
physicians use certain devices, products and materials manufactured by other
companies in conjunction with the use of certain of Target's products.
Reductions in the availability or the elimination of such complementary products
have had and may continue to have an adverse effect on sales of Target's
products. This is believed to have been a contributing factor to the decrease in
the percentage of total revenues derived from domestic sources during the past
several quarters. Currently, products sold commercially in the United States
pursuant to 510(k) clearance by the FDA may generally be marketed in Europe.
However, political and regulatory changes, particularly in Western Europe in
connection with the formation of the European Union, as well as the future
impact of IS09000 standards may adversely affect Target's product sales in
Europe. Similarly, changes in the United States and foreign national health care
policies, including third-party reimbursement issues, may have a significant
adverse effect on revenues of Target. Furthermore, the future rate of Target's
revenue growth, if realized, may be below that experienced in prior annual and
quarterly periods.
 
                                       31
<PAGE>   34
 
     In October 1994, Target acquired certain assets and liabilities of the
former distributor of Target's products in Germany. Target has formed a
subsidiary that is responsible for the direct sales operations of Target in
Germany. As a result, Target anticipates that future sales to end-users in
Germany will be at prices higher than those of sales to the former distributor,
reflecting the markup previously realized only by the distributor. Two months of
such sales activity are reflected in the three month period ended December 31,
1994.
 
     Cost of Sales.  Cost of sales as a percentage of product sales was 38% for
fiscal 1994 compared to 34% and 36% for fiscal 1993 and 1992, respectively. For
the nine month period ended December 31, 1994, cost of sales as a percentage of
product sales decreased to 32% from 40% in the prior year period. Included in
cost of sales for fiscal 1994 and the nine months ended December 31, 1993 was a
charge for the estimated costs associated with changes being made to the GDC
system as described below. Excluding the GDC charge, cost of sales was $11.9
million, or 34% of product sales for fiscal 1994 and $8.6 million, or 34% of
products sales for the nine months ended December 31, 1993. Target's increased
manufacturing efficiency, primarily due to increased production volume, was
offset primarily by the commencement of sales of products manufactured by other
companies which are sold by Target at lower gross margins. In addition, the
commencement of the direct sales operation in Germany contributed to the
improvement in cost of sales as a percentage of revenues for the nine months
ended December 31, 1994. Target believes that the reduction in cost of sales as
a percentage of product sales from fiscal 1992 to 1993 is attributable to
several factors, including commencement of sales to CMI at higher gross margins
than had been realized with the prior Japanese distributor, the price increases
discussed above, and increased manufacturing volume as a result of Target's move
to its current facility in fiscal 1993 which resulted in improved productivity.
Generally, there can be no assurance that cost of sales as a percentage of
revenues will show improvement in future periods over current or prior periods
due to the distribution by Target of certain products at lower gross margins,
fluctuation in manufacturing production levels, potential increases in certain
costs associated with the use of third-party technology and potential pressure
on product prices as a result of competition. As a result of the direct sales
operation in Germany described above, a slight improvement in cost of sales as a
percentage of revenues derived from sales in such country will likely be
included in future period results. In addition, although no supply issues have
arisen in the past, there can be no assurance that current or future suppliers
of Target's raw materials will be able to continue to meet the quality and
quantity demands of Target at current suppliers' prices.
 
     Target's GDC system is an investigational device that is currently being
sold to a limited number of clinical investigators pursuant to an IDE. In
October 1993, Target announced that it was pursuing certain changes to the GDC
system as a result of magnetic resonance imaging ("MRI") tests which indicated a
potential for the creation of small metallic particles during the electrolytic
detachment of the coil. Upon completion of certain laboratory tests of these
changes a supplement to the existing IDE was filed with the FDA in January 1994
and approved in March 1994. The revised IDE protocol submitted to the FDA by
Target required commencement of limited clinical trials for the modified GDC
system. Target has exchanged modified product for any original product that
customers still had in their inventory as treatment sites were converted to the
modified product. The limited clinical trials in the United States were
commenced in April 1994. The clinical trials with the modified GDC system have
shown an apparent reduction in both the frequency of the occurrence and the size
of these microscopic particles. The results of these clinical trials were then
included in a new application for 510(k) clearance for the modified GDC system,
which Target submitted in March 1995. Results of the clinical investigations of
both the original GDC system, for which the 510(k) application was withdrawn,
and the modified GDC system were included as supporting data in its March 1995
510(k) application. Target anticipates that this application, which includes
clinical data on approximately 800 patients, will be reviewed by advisory
consultants to the FDA, some of whom may also be members of other FDA panels.
This review may increase the overall length of the regulatory review period.
Regulatory clearance to market the modified product in
 
                                       32
<PAGE>   35
 
France was obtained during the quarter ended December 31, 1994, and Target is
currently pursuing regulatory clearance in Japan for such product.
 
     Target has provided for the estimated costs of exchanging customer's
inventory and disposition of Target's remaining inventory of original GDC
product. A $1.5 million charge was included in cost of sales for the nine months
ended December 31, 1993. The effect of this charge on net income after benefit
for income taxes was approximately $975,000, or $.14 per share. Although Target
does not anticipate a recurrence of the $1.5 million charge, no assurance can be
given that similar incidents will not occur in the future with respect to the
GDC system or other Target products.
 
     Research and Development.  Research and development ("R&D") expense, which
includes expenditures for regulatory compliance and quality assurance, increased
17% to $7.6 million in fiscal 1994 compared to $6.5 million in fiscal 1993. R&D
expense increased 49% in fiscal 1993 from $4.3 million in fiscal 1992. For the
nine months ended December 31, 1994, R&D expense increased 37% to $7.5 million
from $5.5 million in the prior year period. Target attributes the increased
amounts expended for R&D primarily to the expenses incurred in collecting
clinical data, preparing regulatory filings for new products and expansion of
its research activities and pilot manufacturing line. The pilot manufacturing
line was developed to aid in the transition between the new product development
and manufacturing stages of production. As a percentage of product sales, R&D
expense was 22% for fiscal 1994 compared to 23% for both fiscal 1993 and 1992.
This decrease is primarily attributable to increased revenues and a
slower-than-anticipated increase in the number of R&D personnel. R&D expense was
22% and 21% of revenues for the nine-month periods ended December 31, 1994 and
1993, respectively. This increase is primarily attributable to increased
headcount in addition to the factors described above.
 
     Target believes that its investments in product development and engineering
and manufacturing processes are essential to enable it to maintain its
competitive position. Furthermore, Target believes that such investments enhance
its ability to continue to attract qualified engineers which Target believes is
critical to the continued development of future products. Target expects to
continue to make substantial expenditures on new product development and to
continue to increase the dollar amount expended for R&D in the foreseeable
future.
 
     Selling, General and Administrative.  Selling, general and administrative
("SG&A") expense for the year ended March 31, 1994 increased to $9.2 million
from $7.5 million and $5.4 million for the years ended March 31, 1993 and 1992,
respectively. For the nine months ended December 31, 1994, SG&A expense
increased to $9.6 million from $6.9 million in the prior year period. As a
percentage of product sales, SG&A expense was 26%, 27% and 29% in fiscal 1994,
1993 and 1992, respectively, and 28% and 27% in the nine months ended December
31, 1994 and 1993, respectively. The increase in the amount expended was
primarily due to additional staffing, including sales and management personnel,
to expand the corporate infrastructure, to support the growth in Target's
product sales and, with respect to the nine months ended December 31, 1994,
expenses associated with the commencement of operations in Germany. Target
currently anticipates that the dollar amount expended will continue to increase
primarily due to the recent commencement of direct operations in Germany as
described above (including costs associated with the additional headcount and
marketing operations and the amortization of purchase price in excess of the
fair value of the net tangible assets acquired), additional expenses associated
with a legal action filed by Target to protect certain of its proprietary assets
and planned increases in sales and support staff to introduce, market and
support anticipated new products for which increased physician training and
education, clinical field work and sales support will be required. These
expenses may also increase as Target pursues the feasibility of additional
operations overseas.
 
     Income from Operations.  Income from operations was $5.1 million in fiscal
1994, an increase of 16% from $4.4 million in fiscal 1993. This increase is
attributable to increased product sales and slightly lower R&D and SG&A expenses
as a percentage of product sales over the previous year. These reductions have
been partially offset by the charge to cost of sales for estimated costs
associated with the changes to the GDC system as described above. Income from
operations
 
                                       33
<PAGE>   36
 
increased to $4.4 million in fiscal 1993 from $3.7 million in fiscal 1992. The
increase was primarily a result of increased revenue in fiscal 1993, a reduction
from 1992 to 1993 in cost of sales as a percentage of product sales and
decreased SG&A expenses as a percentage of product sales. The favorable changes
were partially offset by the absence of revenue from a research partner in
fiscal 1993, while $1.4 million of such revenue was recorded in fiscal 1992.
 
     For the nine-month period ended December 31, 1994 income from operations
increased to $6.3 million compared to $3.0 million for the same period of the
prior year. This increase is primarily attributable to the charge for the GDC
system taken in the prior year as described above, increased revenues and lower
cost of sales as a percentage of revenues compared to the prior year periods as
described above.
 
     Although Target has experienced revenue growth since its inception and has
been profitable on a quarterly basis since the quarter ended December 31, 1990,
no assurance can be given that revenue growth or profitability on a quarterly or
annual basis will be sustained. Target's results of operations have varied
significantly from quarter to quarter, and revenue growth rates have been
inconsistent. Future operating results will depend upon several factors in
addition to those discussed above, including the timing and amount of expenses
associated with expanding Target's operations both domestically and
internationally, increased revenues and expenses in conjunction with Target's
German operations, Target's ability to successfully meet new product development
plans, success in achieving regulatory clearance for new products (including
Target's detachable coil systems) in a timely manner, the acceptance of new
product introductions both in the United States and internationally, the mix
between pilot production of new products and full-scale manufacturing of
existing products, the mix between domestic and export sales, the availability
of complementary products and the effects this may have particularly on domestic
sales, possible changes in ordering patterns of its customers due to changes in
the business environment or to potential variations in foreign exchange rates,
Target's ability to continue to attract qualified engineers to further the
development of future products, potential future partnering arrangements,
changes in the domestic and foreign health care policies (including third-party
reimbursement issues), increased competitive forces, developments in Target's
ongoing intellectual property litigation, increased expenses associated with
protecting Target's proprietary assets and the general litigious nature of the
medical device industry. Target also believes that seasonal patterns, including
a reduction in the number of procedures performed by physicians using Target's
products during summer and holiday periods, may affect its quarterly revenue
stream. In addition, Target cannot predict ordering rates by distributors, some
of which place infrequent stocking orders while others order at regular
intervals. As a result of these and other factors, Target expects to continue to
experience significant fluctuations in its quarterly operating results.
 
     Target's Common Stock price has been and may continue to be subject to
significant volatility, particularly on a quarterly basis. Any shortfall in
revenues or earnings from levels expected by securities analysts could have an
immediate and significant adverse effect on the trading price of Target's Common
Stock in any given period. Finally, Target participates in a highly dynamic
industry, which often results in significant volatility of Target's Common Stock
price.
 
     Interest and Other Income.  Net interest income increased to $954,000 in
fiscal 1994 compared to $890,000 in fiscal 1993. For the nine month period ended
December 31, 1994, net interest income increased to $921,000 from $682,000 for
the prior year period. These increases are primarily attributable to increased
amounts of cash generated from operating activities which were available for
investment. The increase in net interest income to $890,000 in fiscal 1993 from
$297,000 in fiscal 1992 is attributable to an increase in cash, cash equivalents
and short-term investments resulting from Target's initial public offering of
its common stock in January 1992, the proceeds of which were invested for only a
portion of fiscal 1992. Target expects that interest rates obtainable in the
remainder of fiscal 1995, for the quality of cash investments it seeks, are
unlikely to exceed
 
                                       34
<PAGE>   37
 
significantly the rates obtained in recent periods and, therefore, does not
expect significant increases in interest income in the foreseeable future.
 
     Other income increased to $515,000 in fiscal 1994 from $16,000 in fiscal
1993. Target had no other income in fiscal 1992. Other income for the nine month
period ended December 31, 1994 increased to $973,000 from $276,000 in the same
period of the prior year. The increase from fiscal 1993 to 1994 is due, in part,
to $445,000 received in fiscal 1994 pursuant to the management agreement with
the Japanese joint venture whereby Target was required to provide certain
services during calendar 1994 for which the joint venture paid Target a total of
$700,000. The increase in the nine-month data is primarily due to increased
equity earnings in Target's Japanese joint venture and to $85,000 recognized
during each of the first three fiscal 1995 quarters pursuant to the management
agreement described above. Also included in other income is Target's portion of
equity losses in unconsolidated subsidiaries for which Target's interest is less
than 50% and which are accounted for on the equity method. Target anticipates
that other income may decrease during the remainder of fiscal 1995 and the next
fiscal year due to expected lower earnings in Target's Japanese joint venture as
a result of anticipated price increases to Target's Japanese distributor and the
recognition of increased equity losses resulting from anticipated additional
investments by Target in its less than 50% owned subsidiaries to further the
development of these companies' products.
 
     Provision for Income Taxes.  Target's combined effective federal and state
tax rate was approximately 34% in fiscal 1994 compared to 33% and 38% in fiscal
1993 and 1992, respectively. The fiscal 1994 and 1993 rates reflect the benefits
derived from Target's foreign sales corporation, research credits and certain
nontaxable investment income. For the nine months ended December 31, 1994 and
1993, Target's income tax provision has been calculated based upon the estimated
annual effective tax rate for the fiscal years ending March 31, 1995 and 1994,
respectively, and reflects the benefits derived from Target's foreign sales
corporation, research credits and certain nontaxable investment income. A
revision of such estimate during the third quarter of fiscal 1995 resulted in a
reduction of the estimated effective rate for fiscal 1995 to 36% from the
previous estimate of 37%. Target anticipates a significant reduction in its
estimated effective rate for fiscal 1995 due to increased benefits derived from
foreign tax credits generated in Japan as a result of certain changes with
respect to Target's ownership of its Japanese joint venture in the fourth
quarter of fiscal 1995.
 
     Effective April 1, 1993, Target adopted Financial Accounting Standards
Board Statement 109, "Accounting for Income Taxes." As permitted by Statement
109, Target elected to report the cumulative effect of the change currently
rather than restate the financial statements of prior years. The positive
cumulative effect of the change in method of accounting for income taxes of
$631,000 was recorded in the first quarter of fiscal 1994. Target has considered
the evidence supporting the realizability of net deferred tax assets at March
31, 1994 including carrybacks, future reversal of temporary differences and
future taxable income exclusive of temporary differences, and has recorded a
valuation allowance of $490,000 to reduce the net deferred tax assets to the
amount that is more likely than not to be realized.
 
     Target's provision for income taxes for periods prior to February 1, 1992,
was determined based upon Tax Allocation Agreements with Collagen. Such
provision may not reflect Target's actual tax rate had it not been consolidated
with Collagen for tax purposes. Consequently, Target has presented on the face
of Target's statement of income unaudited pro forma net income and pro forma net
income per share for fiscal 1992 assuming Target filed its tax returns on a
separate company basis. For the period February 1, 1992 through March 31, 1994,
Target's federal and state income tax provisions are calculated on a separate
company basis.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     At December 31, 1994, Target had working capital of approximately $43.1
million and its principal sources of liquidity consisted of approximately $36.4
million in cash, cash equivalents and
 
                                       35
<PAGE>   38
 
short-term investments, cash provided by operating activities and $3.0 million
available under a line of credit which expires in July 1996. At December 31,
1994, no amounts were outstanding under this line of credit. Net cash provided
by operating activities for the nine months ended December 31, 1994 was $4.3
million.
 
     Inventories increased to $5.0 million at December 31, 1994 (including
inventories held at the German subsidiary location) compared to $3.0 million at
March 31, 1994. The increase is primarily attributable to the products
introduced during the last year resulting in a broader product range for which
inventories are maintained to meet customer demand and increased revenue levels.
Accounts receivable increased to $8.9 million at December 31, 1994 compared to
$6.4 million at March 31, 1994 due primarily to the increased sales volume in
the third quarter of fiscal 1995 and to the consolidation of accounts receivable
of the new German subsidiary described above. Other assets increased to $6.2
million at December 31, 1994 from $3.0 million at March 31, 1994 primarily due
to the net effect of equity accounting for Target's joint venture and
unconsolidated subsidiaries, increased investments in unconsolidated
subsidiaries and increased long-term receivables from less than 50% owned
subsidiaries pursuant to lease-line agreements with Target as lessor. Target
anticipates making additional investments in its less than 50% owned
subsidiaries during the final quarter of fiscal 1995 of up to an aggregate of
approximately $750,000 and approximately $200,000 of additional lease-line
drawdowns. Target currently expects to purchase approximately $3.5 million of
capital equipment in fiscal 1995 of which purchases and commitments totaling
approximately $2.9 million had been made at December 31, 1994.
 
     Target expects to invest $1.7 million in fiscal 1996 to substantially
upgrade its information systems infrastructure. This upgrade is expected to
improve customer service turnaround times and better materials planning. There
can be no assurance that this project will be completed successfully or in a
timely manner, or that the project will not result in disruptions in Target's
operations and it is unlikely that these improvements will result in increased
revenues or profits in the near term if at all.
 
     Target believes that available cash, cash equivalents and short-term
investments, as well as funds expected to be generated from operations, will be
sufficient to meet Target's operating expenses and cash requirements for the
foreseeable future.
 
                                       36
<PAGE>   39
 
                              BUSINESS OF COLLAGEN
 
GENERAL
 
     Collagen develops, manufactures and markets on a worldwide basis high
quality biocompatible products for the treatment of defective, diseased,
traumatized or aging human tissues. Collagen has grown by identifying medical
applications for its technology, developing innovative products and building
markets with respected healthcare professionals, either directly or with
marketing and technology partners. Collagen's core products are principally used
in cosmetic and reconstructive applications for the face, the treatment of
stress urinary incontinence, and bone repair. Collagen focuses on development of
new products based upon biomaterials, especially collagen, for sale in human
healthcare markets worldwide.
 
CORE TECHNOLOGY
 
     The foundation of Collagen's current business is the collagen protein
family, around which Collagen has developed proprietary technology and patented
materials, processes and uses. Collagen is a family of naturally occurring
proteins that serve as the basic structural building blocks of the tissues found
in skin, cartilage, bone, tendons, ligaments, arterial walls, nerve sheaths and
other organs and tissues of the body. Collagen is present in all mammals in
higher concentration than any other protein and is quite similar among species.
There are at least fifteen types of collagen, the most common of which is the
type primarily used in Collagen's commercial products and products under
development.
 
     Collagen has developed proprietary processes to purify its bovine-source
collagen on a commercial scale and to manufacture "tissue-like" implants from
the resulting materials. These proprietary processes alter the immunological
profile of the bovine-source collagen, thus minimizing the potential for causing
an allergic reaction. The result is a purified and sterilized fibrous collagen
material that can be easily injected or implanted into the human body.
 
     The potential for causing an allergic reaction arising from the injection
of bovine-source collagen is relatively low. Based on Collagen's statistics,
approximately 97% of men and women tested show no allergic reaction to a skin
test and can be treated with the bovine-source collagen injection. The 3% that
show an allergic reaction to the skin test display typical symptoms of
hypersensitivity, which include redness, itchiness and swelling. An additional
1-2% of the people treated develop an allergic reaction after one or more
injections.
 
STRATEGY
 
     Collagen's strategy consists of the following principal elements:
 
     - Expand Existing Medical Franchise.  Collagen has a 14-year involvement
       with the cosmetic procedure-oriented segments of the plastic surgery and
       dermatology markets. Medical procedures for cosmetic indications in those
       markets are generally paid for by the patient and therefore are not
       commonly subject to reimbursement constraints imposed by third party
       payors. Collagen's objectives include developing, in-licensing, and
       acquiring products related to this market. Collagen holds marketing
       rights in the United States, United Kingdom, Italy, France and Germany
       for the TRILUCENT Breast Implant, which is a vegetable-oil based product
       currently under development by LipoMatrix, Incorporated ("LipoMatrix"), a
       company affiliated with Collagen.
 
     - Broaden Therapeutic Applications.  Collagen has developed innovative
       medical products that take advantage of the physical and biological
       properties of collagen, and has developed proprietary collagen technology
       platforms that could lead to new applications for product development. In
       addition, Collagen has implemented an "affiliate" program to expand its
       new product development activities outside of the areas of its core
       competence, such as interventional cardiology, ophthalmology, and otology
       (treatment of ear disorders).
 
                                       37
<PAGE>   40
 
     - Enhance Biomaterials Technology.  Collagen has substantial research,
       pre-clinical, clinical and regulatory expertise in the development of
       collagen-based medical devices. Collagen's current objectives include
       improving the clinical persistence of current collagen materials and
       reducing or eliminating allergic reactions arising from the bovine source
       of current collagen products.
 
PRODUCTS, MARKETS AND METHODS OF DISTRIBUTION
 
     Cosmetic and Reconstructive Surgery.  Collagen has three principal products
for the treatment of skin contour defects: Zyderm I Implant, Zyderm II Implant,
a more concentrated form of injectable collagen, and Zyplast Implant, a
cross-linked collagen product. These products are sterile devices, composed of
highly purified bovine dermal collagen, dispersed in a saline solution
containing a small amount of lidocaine and packaged in a sterile syringe. They
are injected with a fine gauge needle into depressed layers of skin to elevate
the area to surface contour.
 
     Depending on the indication and the product (or product combination) used,
most patients can achieve considerable correction in one to four treatment
sessions, utilizing an average of 1.5 - 2.0 cc of collagen product. The implants
take on the texture and appearance of normal host tissue and are subject to
similar stresses and aging processes. Consequently, supplemental treatments are
often necessary after initial treatment, depending on the location and original
cause of the skin deformity.
 
     Collagen believes that opportunities exist in the market for injectable
collagen implants based on potential new products and product applications,
potential increases in patient awareness of the procedure and product price,
demand among younger people for cosmetic procedures and increased physician
interest in cosmetic procedures not reimbursed by third party payors. Factors
such as negative publicity, adverse rulings by regulatory authorities or in
connection with product liability lawsuits, introduction of competitive products
by third parties or other loss of market acceptance for Collagen's principal
products may significantly and adversely affect Collagen's business, financial
condition and results of operations.
 
     Collagen markets Zyderm and Zyplast Implants primarily to the approximately
11,000 dermatologists and plastic surgeons in the United States through a direct
sales force. Approximately 4,000 of these medical professionals have purchased
Zyderm and Zyplast Implants from Collagen in the past two years. United States
sales of Zyderm and Zyplast Implants, which represented slightly more than 50%
of worldwide sales of Zyderm and Zyplast Implants, remained relatively flat from
year to year.
 
     Collagen utilizes a variety of methods to market its dermatological
products. Collagen sponsors a "Partners in Growth" program for plastic surgeons
and dermatologists. This program is designed to identify and support a committed
group of physicians who endorse the appropriate use of injectable collagen and
are skilled in its proper use. Collagen conducts other physician marketing
activities such as direct mail campaigns, physician education, in-office
merchandising and patient seminars. Collagen has emphasized physician education
to ensure proper training in the use of its products and timely communication of
clinical and product use information. To stimulate demand at the patient level,
Collagen also conducts consumer marketing awareness programs such as public
relations events, health and beauty magazine advertising and direct mailing
campaigns.
 
     Collagen markets its Zyderm and Zyplast Implants directly to physicians in
10 European countries, Canada, Australia and New Zealand. Collagen markets its
products through distributors in all other international markets. Collagen has
granted exclusive distribution rights for Zyderm and Zyplast Implants in Japan.
Over the past two years, Collagen has appointed a number of new foreign
distributors for its injectable collagen products.
 
     A large portion of Collagen's revenues in recent years has come from its
international operations. Consolidated export sales of Zyderm and Zyplast
Implants totaled $20.8 million in fiscal 1994. Export sales for Zyderm and
Zyplast Implants represented 32% of Collagen's revenues in fiscal
 
                                       38
<PAGE>   41
 
1994 and 33% for the six months ended December 31, 1994. Collagen has expanded
and intends to further expand its direct selling efforts in certain
international markets. There can be no assurance that difficulties associated
with a transition to direct marketing efforts would not have an adverse effect
on Collagen's results of operations.
 
     Incontinence.  According to the National Institutes of Health, more than
ten million Americans suffer from urinary incontinence, or the involuntary loss
of urine. While comprehensive data are not available as to the incidence of a
form of stress urinary incontinence called intrinsic sphincter deficiency
("ISD"). Collagen has estimated, based upon physician survey information, that
as many as one million of these persons suffer from ISD, a poor or
nonfunctioning bladder outlet mechanism that may be helped by a locally injected
bulking agent. Collagen and its marketing and distribution partner, Bard,
received approval from the FDA to produce and market Contigen Implant in
September, 1993 for the treatment of ISD. ISD occurs among all demographic
groups, but its incidence increases with age and is twice as high in women as
men. Management and treatment alternatives have historically included absorbent
products, behavior modification, medication and surgery. Contigen Implant
injections may improve stress incontinence caused by stretched pelvic muscles
from childbirth, decreased tone in the pelvic muscles supporting the bladder
(often associated with menopause and aging) and prostate surgery.
 
     Contigen Implant is a sterile, highly purified bovine dermal collagen that
is lightly crosslinked and dispersed in a saline solution. Contigen Implant is
injected into the submucosal tissues of the urethra and/or bladder neck, and
into the tissues adjacent to the urethra. The injection of Contigen Implant
creates increased tissue bulk and subsequent coaptation (joining) of the
urethral lumen. After injection, the suspended collagen forms a soft cohesive
network of fibers. Over time, the implant takes on the appearance of normal host
tissue.
 
     Pursuant to the terms of an agreement between Collagen and Bard, Bard
purchases commercial products, including Contigen Implant, developed under this
agreement. In addition, Collagen receives a percentage of Bard's direct sales to
physician customers. Bard holds exclusive worldwide marketing and distribution
rights to Contigen Implant.
 
     Collagen recorded approximately $16.7 million of revenue from sales of
Contigen Implant in fiscal 1994. Of such revenue, $15.9 million was derived from
sales of Contigen Implant to Bard and $789,000 from Bard's direct sales to
physicians, compared to $4.4 million of sales of Contigen Implant to Bard
recorded in fiscal 1993. For the six months ended December 31, 1994, product
sales of Contigen Implant to Bard were $8.1 million, which consisted of
shipments of Contigen Implant of $6.6 million and income from Bard's direct
sales of Contigen Implant to physician customers of approximately $1.5 million.
There were no sales of Contigen Implant in fiscal 1992.
 
     Orthopaedics.  Collagen and its orthopaedic marketing partner, Zimmer, a
wholly-owned subsidiary of Bristol-Myers Squibb, received approval from the FDA
in May 1993 to produce and market Collagraft Implant. Collagraft Strip, a
"premixed" formulation which is the early "ready-to-mix" Collagraft Implant
formulation, was subsequently approved in January 1994. Collagraft Implant and
Collagraft Strip, when used with autogenous bone marrow, is indicated for use in
acute long bone fractures and traumatic osseous defects to provide a matrix for
the repair process of bone. Bone graft substitute eliminates the need for
patients to undergo a painful autograft bone grafting procedure, which involves
harvesting patients' own bone from another site, and it prevents the
transmission of human infectious agents and inconsistent results from allograft
procedures (bone graft supplied through a bone bank). During surgery Collagraft
Strip or Collagraft Implant is mixed with the patient's own bone marrow and is
placed into the fracture site providing a scaffolding around which new bone will
grow. Medical conditions which may require bone grafting include acute long bone
fractures and certain tumors and cysts.
 
     Collagraft Implant and Collagraft Strip are a mixture of purified fibrillar
collagen and hydroxyapatite/tricalcium phosphate ceramic ("HA/TCP"), and is
supplied sterile in both a strip form (premixed) and a ready-to-mix form.
Hydroxyapatite is a substance which is biocompatible and is
 
                                       39
<PAGE>   42
 
minimally resorbed. Tricalcium phosphate is radiopaque, biocompatible and
biodegradable. Its degradation products can be reconstituted by the body to form
new bone mineral allowing for bone deposition.
 
     An agreement between Collagen and Zimmer provides for the development and
distribution of collagen and other biologically-based products for orthopaedic
applications. Collagen will manufacture approved products and sell them to
Zimmer, which has exclusive marketing rights for Collagraft Implant and
Collagraft Strip in the United States and Asia. Collagen holds marketing rights
for Collagraft Implant and Collagraft Strip in Europe, Canada, Africa and the
Middle East. Collagraft Implant and Collagraft Strip are currently sold only in
the United States, and Collagen does not anticipate substantial sales outside
the United States for the foreseeable future.
 
     Fiscal 1994 represented the first full year of Collagraft Implant and
Collagraft Strip sales, which totaled $2.7 million. Collagraft Implant and Strip
sales to Zimmer totalled $1.6 million in the six months ended December 31, 1994,
compared to sales of approximately $700,000 of Collagraft Implant in the same
period of the prior year. Collagen had approximately $150,000 of Collagraft
Implant and Collagraft Strip sales in fiscal 1993. There were no sales of
Collagraft Implant or Collagraft Strip in fiscal 1992.
 
     A number of uncertainties exist surrounding the marketing and distribution
of Collagen's new products, Contigen Implant, Collagraft Implant and Collagraft
Strip. Collagen's business and financial results could be adversely affected in
the event that either or both of Bard and Zimmer, or Collagen, are unable to
effectively market the product, accurately anticipate customer demand, or
effectively manage industry-wide pricing and cost containment pressures in
health care.
 
     Other Medical Products.  In June 1979, Collagen introduced Vitrogen 100
Purified Collagen for Tissue Culture ("Vitrogen 100 Collagen"), which is
primarily for non-diagnostic laboratory use in cell and tissue culture systems
for biomedical research. This sterile solution of collagen provides an
environment which facilitates cell growth, maturation and differentiation.
 
COMPETITION
 
     The medical device industry is characterized by rapidly evolving technology
and increasing competition under the recent changes in the health care
environment. Collagen faces competition in each of its target product markets.
 
     Zyderm and Zyplast Implants.  Collagen is aware of one commercial product
in the United States that is directly competitive with Zyderm and Zyplast
Implants. This product is a gelatin-based (denatured collagen) product for soft
tissue augmentation presently being marketed in the U.S. and Canada. Collagen is
also aware of one foreign company which is marketing a collagen-based material
for soft tissue augmentation internationally. Indirect competitors to Zyderm and
Zyplast Implants include, among others, chemical peels, fat injections,
dermabrasion, laser treatment and face lifts. In addition, several companies are
engaged in research and development activities examining the use of collagen and
other biomaterials for the correction of soft tissue defects. There can be no
assurance that Collagen will not face increased direct and indirect competition
in the soft-tissue augmentation market.
 
     Contigen.  At the present time, autologous fat, silicon micro-implants and
polytetrafluorethane (Teflon paste, or PTFE) are directly competing with
Contigen Implant for the treatment of stress incontinence due to ISD. Neither
silicon micro-implants nor PTFE have been approved by the FDA for use in the
United States. Other methods of treatment or amelioration of ISD may be
considered competitive with Contigen Implant. These include surgery, medication,
absorbent products and behavior modification.
 
     Collagraft.  Bone graft substitutes currently are used in a small fraction
of bone grafting procedures. The vast majority of bone grafting procedures
currently use autograft (autologous bone) taken from the patient's own body and
allograft (bone bank bone taken from deceased donors). Collagraft Implant and
Collagraft Strip belong to a new family of products called bone graft
substitutes. The most direct competitor to Collagraft Implant and Collagraft
Strip is Pro-Osteon, a
 
                                       40
<PAGE>   43
 
synthetic bone graft substitute made of a coral-like mineral. A less direct
competitor to Collagraft Implant and Collagraft Strip is an allograft bone
product called Grafton, which is packaged in a syringe and marketed and priced
like a bone graft substitute.
 
     In addition, several companies and institutions are engaged in the
development of collagen-based and other materials, techniques, procedures and
products for use in medical applications anticipated to be addressed by
Collagen's products, including Contigen Implant and Collagraft Implant products.
Some of these companies and institutions may have substantially greater capital
resources; research and development staffs and facilities; and experience in
conducting clinical trials, obtaining regulatory approvals, and manufacturing
and marketing products similar to those of Collagen. There can be no assurance
that Collagen's competitors will not succeed in developing technologies and
products that are more effective than any which have been or may be developed by
Collagen or that would render Collagen's technology and products obsolete or
non-competitive. There can be no assurance that such potential competition will
not have an adverse effect on the future business or financial condition of
Collagen. Certain of Collagen's collagen-based products, including the Zyderm
implants, were manufactured and sold pursuant to an exclusive license from
Stanford University under a U.S. patent, which expired in April 1993, covering
the use of native, solubilized collagen for soft-tissue augmentation. The
expiration of this patent may result in increased competition in the market for
injectable collagen implants if and as other companies enter that market.
 
MANUFACTURING
 
     Collagen manufactures its collagen-based products utilizing readily
available chemicals and enzymes. The source of its collagen is bovine (cow)
dermis. In an attempt to ensure that the hides are free from any
herd-threatening disease such as BSE, the hides are sourced from a closed herd,
which requires the physical separation of the herd from other herds, the
tracking of the lineage of each animal and the maintenance of each animal under
a veterinarian program. Collagen believes that the supply of raw materials and
processing materials for its manufacturing operations is and will continue to be
adequate for the foreseeable future and that such materials are available from
other sources. Collagen obtains HA/TCP solely from Zimmer for the manufacture of
Collagraft Implant. See "-- Competition" and "Risk Factors -- Risk Factors
Relating to Collagen -- Governmental Regulation and Adverse Publicity."
 
     Collagen's principal products have various refrigerated shelf lives of 30
to 36 months. Collagen typically ships products to physicians as orders are
received on an express delivery basis, and has no material backlog. It is
Collagen's policy to maintain levels of finished goods inventory adequate to
allow for the expeditious handling of orders received. Collagen believes its
physician customers typically purchase products on an as-needed basis, while
distributor customers purchase products based on inventory stocking levels.
 
     In November 1990, Collagen commenced manufacture of its collagen-based
products in its facility located in Fremont, California, significantly
increasing its capacity. Collagen has experienced and may continue to experience
disruptions in its manufacturing schedule as it continues to manufacture
products in increasingly larger quantities and with new process improvements.
Collagen's manufacturing facilities are subject to regulatory requirements and
periodic inspection by regulatory authorities both in the United States,
including the FDA, and outside the United States, in countries such as the
United Kingdom. See "Risk Factors -- Risk Factors Relating to Collagen -- Single
Manufacturing Facility."
 
PRODUCT RESEARCH AND DEVELOPMENT
 
     Collagen maintains an active program of technology and new product
development. Collagen intends to continue to devote a significant portion of
revenues to research and product development activities throughout its product
lines to generate significant returns to stockholders. Research and Development
("R & D") expenses for Collagen totaled $5.0 million for the six months ended
 
                                       41
<PAGE>   44
 
December 31, 1994, $9.4 million in fiscal 1994, $8.8 million in fiscal 1993, and
$6.9 million in fiscal 1992. R & D expenses represented 14%, 14%, 18%, and 15%
of total revenues for the six months ended December 31, 1994, in fiscal years
1994, 1993 and 1992, respectively. Fiscal 1992 results in the foregoing
comparison exclude results of Target, a consolidated subsidiary of Collagen in
fiscal 1992.
 
     Collagen is pursuing a soft tissue augmentation product development program
with the objective of developing new injectable products and enhancements to
existing products for the treatment of skin contour defects. The types of
improvements being focused on relate to one of two performance criteria:
duration of treatment benefit and/or the elimination of local inflammatory
reactions. Collagen is exploring human collagen, which may prove to be the
alternative for the potential collagen patients who are allergic to bovine-based
products as well as first choice for patients who elect to minimize this
possibility; in addition, human collagen could become the basis for numerous
future products that currently rely on a bovine collagen foundation. There are
two potential sources for human collagen: placental-sourced human collagen and
recombinant human collagen through transgenic animals. Collagen has an ongoing
collaboration with IMEDEX, a subsidiary of Rhone-Poulenc S.A., to develop new
products based on the use of human placental-collagen. In addition, Collagen has
made an equity investment in and is actively collaborating with GenPharm
International, Inc. for the purpose of developing recombinant human collagen.
 
     The Amended and Restated Development and Distribution Agreement between
Collagen and Bard provides for funding of expenditures by Bard related to
certain R&D projects agreed upon by both companies. The funding, which will be
equal to a percentage of net sales of Contigen Implants, is not expected to have
a significant impact on fiscal 1995 results.
 
     An additional element of Collagen's product development strategy is the
support of research at leading institutions in areas that may broaden Collagen's
basic technology or suggest new clinical applications for Collagen's products.
Collagen enters into contractual research agreements with various institutions
throughout the United States and Europe in the normal course of business. These
agreements typically provide for various levels of funding over time periods not
exceeding two years. These agreements typically give Collagen rights of first
refusal to develop and market any commercial products which may result from
research performed and impose, in some cases, royalty and payment obligations
and marketing restrictions.
 
     In addition to joint development arrangements, Collagen has an active
program for developing new products through affiliated companies in which
Collagen makes equity and debt investments. Collagen believes the formation of
new companies allows each to focus its technology on select market segments, to
bring products efficiently to market and to advance proprietary know-how at a
rapid rate. However, there can be no assurance that these investments will
result in positive returns nor can there be any assurance on the timing of any
return on such investments. Collagen's product development and research strategy
consists of the following principal elements:
 
     - New Products in New Market Segments.  In fiscal 1994, Collagen, together
       with Target, and Celtrix Pharmaceuticals, Inc., formed Prograft Medical
       Inc. ("Prograft"). Prograft focuses on the development of proprietary
       vascular grafts, vascular stents and vascular stent-graft combinations,
       which may use certain of Collagen's biomaterials, for use in the repair
       and replacement of diseased and damaged blood vessels. As of December 31,
       1994, Collagen held approximately 32% of the equity of, and has also
       entered into license and supply agreements with, Prograft. Also in fiscal
       1994, Collagen and its founder, Dr. Rodney Perkins, formed Otogen
       Corporation, a start-up company which is seeking to develop PEG-collagen
       based tympanostomy tubes and tympanic membrane prostheses for use in the
       ear by otolaryngologists. In fiscal 1993, Collagen participated in the
       formation of CollOptics, Inc. to develop collagen-based lenticules, which
       are custom-made contact lenses for refractive errors.
 
     - New Products in Existing Plastic Surgery/Dermatology Market.  In 1992,
       Collagen participated in the formation of LipoMatrix, a start-up company
       which intends to research, develop,
 
                                       42
<PAGE>   45
 
       manufacture, and market medical devices designed to replace, restore, or
       augment body structures that consist largely of adipose (fat) tissues,
       including the human breast. During fiscal 1994, Collagen made an
       additional equity investment of $1.75 million in LipoMatrix, which
       recently received clearance from the FDA to commence clinical studies in
       the U.S., and already has gathered clinical data on its breast implants
       from more than 100 patients treated in Europe.
 
     - Access to New Technology.  In addition, Collagen has made an equity
       investment in and is actively collaborating with GenPharm International,
       Inc. for the purpose of developing recombinant human collagen. This
       technology could provide Collagen with a source of recombinant human
       collagen that is chemically identical to native human collagen.
 
LITIGATION
 
     Collagen is involved in various legal actions arising in the ordinary
course of business, the majority of which involve product liability claims.
While the outcome of such matters is currently not determinable, it is
management's opinion that these matters will not have a material adverse effect
on Collagen's future consolidated financial position or results of operations.
 
     Collagen faces an inherent business risk of exposure to product liability
claims alleging that the use of Collagen's technology or products has resulted
in adverse effects. Such risks will exist even with respect to those products
that have received or in the future may receive regulatory approval for
commercial sale. There can be no assurance that Collagen will avoid significant
product liability claims and attendant negative publicity. Furthermore, there
can be no assurance that present insurance coverage will be adequate or that
adequate insurance coverage will remain available at acceptable costs, if at
all, or that a product liability claim or recall would not adversely affect the
future business or financial condition of Collagen. It is possible that adverse
product liability actions could negatively affect Collagen's ability to obtain
and maintain regulatory approval for its products.
 
     In light of regulatory investigations surrounding product safety, Collagen
announced in September 1991 that it will indemnify physicians against damages
and legal fees arising from lawsuits brought to a jury trial alleging a link
between collagen injections and Polymyositis and Dermatomyositis. To date, the
impact of this indemnification on Collagen's results of operations has not been
significant. There can be no assurance, however, that any future such claims
would not have a material adverse effect on Collagen's operating results.
 
     On December 21, 1994, Collagen filed suit against Matrix Pharmaceutical,
Inc., ("Matrix") alleging fraud, misappropriation of trade secrets, unfair
competition, breach of fiduciary duty, inducing breach of contract, breach of
duty of loyalty and tortious interference. Collagen alleges that Matrix, which
uses collagen for certain drug delivery applications, unlawfully obtained
Collagen's confidential and proprietary information relating to Collagen's
products and operations by hiring ten former employees that Collagen alleges had
access to or were knowledgeable about Collagen's proprietary information. On
February 12, 1995, Matrix denied Collagen's allegations and filed a
cross-complaint charging Collagen with, among other things, unfair competition,
defamation and restraint of trade. Matrix also has requested certain declaratory
relief. Howard Palefsky, Chairman of the Board and Chief Executive Officer of
Collagen, was personally named as an additional defendant to the Matrix
defamation charge. Collagen intends to vigorously contest Matrix's charges.
 
EMPLOYEES
 
     As of December 31, 1994, Collagen employed 320 full-time employees, of
which 69 were engaged in research and development, 105 were engaged in sales and
marketing, 95 were involved in production and quality control, and 51 were
engaged in finance and administration. None of Collagen's employees is covered
by a collective bargaining agreement. Collagen also has a Board of Scientific
Advisors which currently consists of five scientists, each of whom is prominent
in his field
 
                                       43
<PAGE>   46
 
and serves as a professor at a major academic institution. Collagen has a
consulting agreement with each advisor which ranges from two to three years.
 
PROPERTIES
 
     Collagen's principal executive, marketing, and research activities are
presently located in three buildings in Palo Alto, California which occupy a
total of approximately 77,000 square feet. Collagen has leased these buildings
under various leases that expire between June 1999 and November 2004 and contain
renewal options. Collagen's international facilities are also leased under
various leases and amount to approximately 10,000 square feet in total.
 
     In 1989, Collagen completed a sale-leaseback transaction relating to its
manufacturing facility in Fremont, California. The facility lease term extends
for fifteen years with four five-year renewal options. Collagen commenced
commercial manufacturing in this facility in November 1990. In addition,
Collagen leases approximately 11,000 square feet of warehouse space in Fremont,
California.
 
     Collagen considers that its facilities are adequate to meet its
requirements for at least the next twelve months.
 
                                       44
<PAGE>   47
 
                               BUSINESS OF TARGET
 
GENERAL
 
     Target develops, manufactures and markets disposable and implantable
medical devices used in minimally invasive procedures to treat vascular diseases
of the brain associated with stroke and other disease sites accessible through
small vessels of the circulatory system. Interventional physicians can navigate
Target's variable stiffness micro-catheters and guidewires through tortuous
blood vessels not accessible using conventional catheters. Target's products are
used to treat diseased, ruptured or blocked blood vessels in the brain
responsible for stroke, the third leading cause of death in the United States.
One of these products, the GDC system, is being used in clinical trials to treat
and prevent the rupture of cerebral aneurysms. Target has recently submitted a
510(k) application to the FDA covering the GDC system. Target's products are
also used in regions of the body other than the brain. Target's products are
used prior to or in lieu of surgery and can significantly reduce procedural
trauma, complexity, risk to the patient, cost and recovery time. Target markets
its products through a direct sales force in North America and internationally
through a network of 30 specialty distributors, its German subsidiary, Target
Therapeutics International GmbH, and its joint venture in Japan with Century
Medical, Inc. ("CMI"), a subsidiary of ITOCHU International, Inc.
 
TARGET STRATEGY
 
     Target's strategy consists of the following principal elements:
 
     - Focus Primarily on Neurovascular Disorders.  Target focuses its resources
       primarily on developing products for the minimally invasive treatment of
       neurovascular disorders associated with stroke. Acute stroke is the third
       leading cause of death in the United States and a major cause of
       long-term disability. Target's micro-catheters and guidewires are
       specially designed to access the tortuous vascular system of the brain
       for delivery of therapeutic agents and devices, such as its micro-coils,
       and chemotherapeutic drugs. Target believes that its GDC system, which is
       currently in clinical trials, can provide minimally invasive treatment
       for cerebral aneurysms.
 
     - Apply Proprietary Technology in Specialized Applications.  In addition to
       treatment of neurovascular disorders, Target also seeks to apply its
       technology in other areas, including access to small peripheral vessels,
       reproductive physiology, vascular stent-graft products and
       electrophysiology. Target pursues these opportunities directly and, in
       areas outside Target's core business focus, through affiliated companies.
       Target expects that in the future it may also pursue such opportunities
       through strategic alliances with other companies.
 
     - Emphasize Technology, Innovation and Leadership.  Target has substantial
       design, manufacturing and applications engineering expertise in the
       development of small vessel access and delivery systems. Target has
       developed proprietary techniques and customized equipment to extrude and
       process its micro-catheters, as well as proprietary processes to grind
       its guidewires to precise specifications. Target has obtained a number of
       patents on its products, including its variable stiffness micro-catheter
       shaft design, and has other patent applications pending.
 
     - Maintain Close Relationships with Leading Practitioners
       Worldwide.  Target maintains close relationships with leading
       interventional neuroradiologists and neurosurgeons worldwide who are
       dedicated to expanding the use of interventional neurovascular
       techniques. Target works closely with interventional physicians to
       identify potential new applications for product development. Target's
       objectives include increasing the number of interventional practitioners
       and promoting new ideas for the intravascular treatment of disease.
       Target actively supports fellowship programs in the United States that
       provide training in interventional techniques.
 
                                       45
<PAGE>   48
 
PRODUCTS
 
     Target's products include micro-catheters and guidewires, micro-coils and
vascular angioplasty products. All of Target's products are intended for single
use and are either disposed of or, in the case of micro-coils, remain in the
patient after the procedure.
 
     MICRO-CATHETERS AND GUIDEWIRES
 
     Target's micro-catheters and guidewires are used to access small vessels in
the circulatory system. A catheterization procedure typically involves the
insertion of a guidewire through a needle puncture into the easily accessible
femoral artery of the upper leg. A large diameter guidewire is pushed through
the vasculature of the circulatory system and a large guiding catheter is then
advanced over the guidewire so that the tip of the guiding catheter reaches the
appropriate large artery. The guidewire is then removed. To access the
vasculature of the brain, Target's guidewires and micro-catheters are advanced
through the large guiding catheter to a blood vessel in the neck and then pushed
through the guiding catheter tip. Using x-ray imaging to monitor positioning,
the interventional physician alternately advances the guidewire and
micro-catheter through blood vessels in the brain to the diseased site. These
blood vessels are smaller than those in the neck and are typically characterized
by numerous acute curves. After the micro-catheter is positioned, the guidewire
is removed to allow the infusion of diagnostic, embolic or other therapeutic
agents through the micro-catheter directly to the diseased site.
 
     Several design characteristics enable Target's guidewires to be manipulated
and maneuvered through small tortuous blood vessels to allow its micro-catheters
to access the diseased site. These include (i) gradual transitioning of
guidewire stiffness to provide a flexible, atraumatic tip and a more rigid
handle for manipulation and advancement, (ii) torqueability to permit steering
of the guidewire by the interventional physician (through manipulation of the
angled tip of the guidewire) into side-branch vessels, (iii) lubricious
guidewire surface coating to reduce friction as the catheter is advanced over
the guidewire, and (iv) tip radiopacity to enable the physician to view the
device under x-ray imaging. Target's Taper, Seeker and Dasher guidewires allow
the interventional physician to use a guidewire specifically designed and
engineered to match the challenges of the vasculature being catheterized.
Target's Taper guidewire is made of a precision ground, tapered stainless steel
core with a wrapped platinum coil tip. The Taper is Target's most steerable
guidewire and is typically used to provide initial access to the tortuous
vascular anatomy. The Seeker and Dasher guidewires are more flexible than the
Taper, incorporating coatings that enhance smooth tracking of Target's
micro-catheters over the guidewire. Target's guidewires range in size from 0.010
inches to 0.022 inches in diameter and are often used sequentially in a
procedure. For example, to access remote sites, an interventional physician
could first use a Taper, followed by a Seeker or Dasher.
 
     To navigate the complex vascular anatomy of the brain and other regions
remote from large arteries, Target's micro-catheters must be rigid enough to be
pushed as much as five feet through the circulatory system, yet flexible enough
to track over a guidewire without injuring the blood vessel. All of Target's
micro-catheters utilize Target's variable shaft stiffness design, which is a
patented design feature of Target's Tracker catheters. Target's micro-catheters
are highly flexible at the leading (distal) end, have a slightly stiffer middle
section and are stiffer still at the trailing (proximal) end. Target believes
that this design enables the interventional physician to navigate tortuous
vessels that cannot practically be navigated by a catheter not incorporating
variable stiffness. Target's largest selling micro-catheter, the Tracker, is
manufactured in diameters ranging from 0.026 to 0.062 inches and in a variety of
lengths. After accessing a diseased site, Target's micro-catheters may be used
by the practitioner to treat the disease by delivering various diagnostic or
therapeutic agents or embolic devices such as Target's micro-coils.
 
     The newest addition to Target's family of Tracker catheters is the
FasTRACKER, which incorporates a proprietary chemically bonded hydrophilic
polymer that allows the micro-catheter to
 
                                       46
<PAGE>   49
 
glide more easily through the circulatory system, possibly resulting in
shortened procedure times. Market clearance for the FasTRACKER has been obtained
in the United States and Japan.
 
     The Soft Stream micro-catheter incorporates perforations on the sides of
the distal end for more effective infusion of diagnostic and therapeutic agents.
Guidewire tracking of the Soft Stream micro-catheter into small tortuous blood
vessels is enhanced by the varied stiffness of the catheter shaft. The flexible
distal end of the Soft Stream micro-catheter is intended to minimize trauma to
occluded vessels, such as saphenous (coronary bypass) vein grafts. The catheter
may remain in the vessel for several hours to permit continuous infusion of
clot-dissolving (thrombolytic) drugs.
 
     Target also markets a number of flow-assisted micro-catheters that
incorporate a highly flexible shaft material and are designed to access diseased
sites characterized by rapid blood flow. Using the "flow-assisted" technique,
the interventional physician advances the micro-catheter without a guidewire and
allows the blood flow to assist in positioning the catheter. In certain cases,
this technique enables interventional physicians to maneuver more quickly
through rapid flow vessels than would be possible using micro-catheters that
track over guidewires. In June 1993, Target introduced a redesigned Zephyr
flow-assisted micro-catheter. In August 1992, Target entered into an agreement
with Balt Extrusion of Paris, France ("Balt") pursuant to which Target agreed to
obtain the necessary regulatory clearance for Balt's neurological products and
to promote and distribute such products on an exclusive basis in the United
States and Canada. The products distributed by Target include Balt's Magic line
of flow-assisted catheters, guiding catheters and catheter valve introducers.
 
     Target's Retriever endovascular snare is designed to retrieve objects in
the cerebral, peripheral and coronary vasculature. The Retriever combines a
guidewire and variable stiffness catheter to allow access to remote, tortuous
vasculature. The distal end of the guidewire is radiopaque and is attached to
the distal end of the catheter, forming a loop. By extending or retracting the
guidewire through the catheter, the interventional physician can adjust the size
of the loop to encircle and grasp the desired object. Target introduced the
Retriever endovascular snare in June 1992.
 
     Target's micro-catheters range in domestic list price from $140 to $340,
and its guidewires range in domestic list price from $120 to $180. In a typical
procedure involving difficult-to-access vessels, multiple Target micro-catheters
and guidewires may be used.
 
     For the nine months ended December 31, 1994 and the fiscal years ended
March 31, 1994, 1993 and 1992, sales of Target's micro-catheters accounted for
approximately 50%, 52%, 49% and 49%, respectively, and sales of Target's
guidewires accounted for approximately 20%, 22%, 24% and 30%, respectively, of
Target's product sales during such periods.
 
                                       47
<PAGE>   50
 
     The following table shows Target's principal micro-catheter and guidewire
products and indicates significant applications for which such products are
used.
 
<TABLE>
<CAPTION>
                                      CURRENT    DATE FIRST
                                      NUMBER       MODEL
                                        OF       INTRODUCED              FDA CLEARED                  REPRESENTATIVE
            PRODUCT LINE              MODELS      IN U.S.              INDICATIONS(1)             CLINICAL APPLICATIONS
------------------------------------  -------    ----------    -------------------------------   ------------------------
<S>                                   <C>        <C>           <C>                               <C>
MICRO-CATHETERS
Tracker Infusion Catheter                8        Oct. 1986    Neurovascular, general vascular   Delivery of diagnostic
                                                               and cardiovascular infusion       and therapeutic agents
Tracker Soft Stream Infusion             2        Dec. 1991    General vascular and cardiovas-   Delivery of diagnostic
  Catheter and Micro Soft Stream                               cular infusion                    and therapeutic agents
  with Hydrolene
Retriever Endovascular Snare             2        June 1992    General vascular use              Retrieval of foreign ob-
                                                                                                 jects in small vessels
Zephyr Flow-Assisted Catheter            1        June 1993    Neurovascular and general vas-    Delivery of therapeutic
                                                               cular infusion                    agents
FasTRACKER Infusion Catheter             4        Aug. 1993    Neurovascular, general vascular   Delivery of diagnostic
                                                               and cardiovascular infusion       and therapeutic agents
Balt Magic Flow-Assisted Catheter        4        Sept.        Neurovascular infusion            Infusion of contrast
                                                  1993                                           materials
FasGUIDE Guiding Catheter                2        Nov. 1994    General vascular use              Conduit for other medi-
                                                                                                 cal devices and infusion
                                                                                                 of diagnostic agents
GUIDEWIRES
Taper Steerable Guidewire                5        July 1987    Neurovascular, general vascular   Assist in placement of
                                                               and cardiovascular use            therapeutic and diagnos-
                                                                                                 tic catheters(2)
Seeker Steerable Guidewire               3        Dec. 1988    Neurovascular, general vascular   Assist in placement of
                                                               and cardiovascular use            therapeutic and diagnos-
                                                                                                 tic catheters
Dasher Steerable Guidewire               2        June 1992    Neurovascular, general vascular   Assist in placement of
                                                               and cardiovascular use            therapeutic and diagnos-
                                                                                                 tic catheters
</TABLE>
 
---------------
 
(1) Not all models are cleared for all stated indications.
 
(2) Pursuant to an agreement with Eli Lilly and Company, Target cannot market
    this product for use in coronary angioplasty applications. See "-- Patents,
    Trade Secrets and Licenses."
 
     MICRO-COILS
 
     Target's family of micro-coil products includes micro-coils that are pushed
through a catheter for delivery to a diseased site, and micro-coils that are
mechanically detached or released in applications and procedures where highly
precise coil placement is necessary.
 
     Target's pushable coils include complex helical and straight platinum
coils, and Braided Occlusion Devices. Target's complex helical and straight
platinum micro-coils are designed to be inserted through a Tracker
micro-catheter to occlude the diseased area of a blood vessel. These micro-coils
are placed by positioning the distal tip of a Tracker micro-catheter at the
desired delivery site and pushing the micro-coil through the catheter and out
the tip with a coil pusher. Target's complex helical coils, when released, twist
and take on a complex shape to fill and block the diseased vessel. Target's
micro-coils are used to treat arteriovenous malformations ("AVM"s), which are
aberrant interconnections of arteries and veins. In these cases, Target's
micro-coils are delivered to the diseased region to block blood vessels and
restrict blood flow. This allows for surgical removal of the AVM with
significantly reduced blood loss. Many models of Target's micro-coils
incorporate polyester fibers to enhance space filling and promote occlusion.
Target's micro-coils vary in length and shape, and range in domestic list price
from $160 to $370 for a box of five. Target has also developed its Braided
Occlusion Devices, all of which are densely covered with polyester fibers and
are manufactured in relatively simple shapes. The greatly increased density of
polyester fibers, relative to Target's other micro-coil products, promotes
occlusion.
 
                                       48
<PAGE>   51
 
     Target's mechanically detachable coils include its GDC system, which
provides detachment through electrolysis, and its Interlocking Detachable Coil
("IDC") system, which provides detachment through release of an interlocking
mechanical coupling.
 
     Target is clinically testing its GDC system for the treatment of
neurovascular aneurysms, which are balloon-like enlargements stemming from
weakened vessel walls. The GDC system is currently being sold, in accordance
with cost-recovery provisions of applicable regulations, to a limited number of
clinical investigators pursuant to an Investigational Device Exemption ("IDE")
for treatment of patients suffering from high-risk or inoperable cerebral
aneurysms. The GDC system incorporates a micro-coil which is attached to a
delivery wire. This allows a micro-coil to be retracted into the catheter and
then reinserted if initial micro-coil placement is suboptimal. In addition,
movement of the micro-coil is eliminated until detachment, which reduces the
risk that the micro-coil will be dislodged. Precise coil placement is essential
for effective treatment but is difficult to achieve and may require a number of
attempts. If placed improperly in an aneurysm, the micro-coil may become
dislodged or released into the bloodstream. Application of a slight electric
current to the wire produces controlled, electrolytic detachment of a complete
coil system after the micro-coil has been placed precisely in the aneurysm. Once
in place, the GDC system is intended to disrupt blood supply to the aneurysm,
occluding and sealing off the aneurysm from the blood vessel. One patent has
been issued and two additional patents have been applied for with respect to the
GDC system.
 
     In October 1993, Target announced that it was pursuing certain changes to
the GDC system as a result of magnetic resonance imaging ("MRI") tests which
indicated a potential for the creation of small metallic particles during the
electrolytic detachment of the coil. Upon completion of certain laboratory tests
of these changes a supplement to the existing IDE was filed with the FDA in
January 1994 and approved in March 1994. The revised IDE protocol submitted to
the FDA by Target required commencement of limited clinical trials for the
modified GDC system. Target has exchanged modified product for any original
product that customers still had in their inventory as treatment sites were
converted to the modified product. The limited clinical trials in the United
States were commenced in April 1994. The clinical trials with the modified GDC
system have shown an apparent reduction in both the frequency of the occurrence
and the size of these microscopic particles. The results of these clinical
trials were then included in a new application for 510(k) clearance for the
modified GDC system, which Target submitted in March 1995. Results of the
clinical investigations of both the original GDC system, for which the 510(k)
application was withdrawn, and the modified GDC system were included as
supporting data in its March 1995 510(k) application. Target anticipates that
this application, which includes clinical data on approximately 800 patients,
will be reviewed by advisory consultants, some of whom may also be members of
other FDA panels. This review may increase the overall length of the regulatory
review period. Regulatory clearance to market the modified product in France was
obtained during the quarter ended December 31, 1994, and Target is currently
pursuing regulatory clearance in Japan for such product.
 
     Unlike the GDC, the IDC is not released by an electrical charge but through
mechanical means. Currently, the IDC system is principally marketed in Japan.
Target is currently seeking regulatory clearance to use the IDC in United States
clinical trials for the treatment of fistulae and AVMs.
 
     For the nine months ended December 31, 1994 and the fiscal years ended
March 31, 1994, 1993 and 1992, Target's micro-coil products, including the GDC
system, accounted for 28%, 24%, 26% and 19%, respectively, of Target's product
sales.
 
                                       49
<PAGE>   52
 
     The following table shows Target's principal micro-coil products and
indicates significant applications for which such products are used.
 
<TABLE>
<CAPTION>
                                               DATE FIRST
                                   CURRENT       MODEL
                                  NUMBER OF    INTRODUCED              FDA CLEARED                  REPRESENTATIVE
          PRODUCT LINE             MODELS       IN U.S.                INDICATIONS               CLINICAL APPLICATIONS
--------------------------------  ---------    ----------    -------------------------------   -------------------------
<S>                               <C>          <C>           <C>                               <C>
MICRO-COILS
Complex Helical and Straight        20         Sept. 1989    Neurovascular and peripheral      Embolization of AVMs and
  Platinum Coils                                             vascular occlusion                trauma-induced vessel
                                                                                               rupture
Guglielmi Detachable Coil System    28         (1)           Investigational Device            Aneurysm embolization
                                                             Exemption permitting limited
                                                             regulated clinical trials for
                                                             neurovascular aneurysm
                                                             occlusion
Interlocking Detachable Coil        14         (2)           None currently                    Embolization of AVMs and
  System                                                                                       fistulae
Braided Occlusion Device            7          Dec. 1992     Neurovascular and peripheral      Embolizations of AVMs and
                                                             vascular occlusion                trauma-induced vessel
                                                                                               rupture
</TABLE>
 
---------------
 
(1) This product is currently in U.S. clinical trials. See "-- Government
    Regulation and Product Testing" for additional information.
 
(2) Target is currently planning clinical trials for this product, for which an
    application for an IDE has been submitted. The initial applications are
    expected to include embolization of AVMs and fistulae. Target expects to
    include data from the planned clinical trials in a submission to the FDA
    seeking future market clearance.
 
     VASCULAR ANGIOPLASTY
 
     Target has developed its Stealth balloon angioplasty micro-catheters,
including the Fas-
STEALTH (which incorporates a hydrophilic polymer), for use in dilation of
certain arteries of the peripheral vasculature that have become narrowed due to
atherosclerotic disease. These balloon-tipped micro-catheters are inserted into
the vessel system and guided through the arteries over a guidewire to the site
of a blockage, using a technique similar to that used to maneuver Target's other
micro-catheters. The deflated balloon is positioned across the occluded area and
inflated and deflated once or several times, resulting in expansion of the
arterial narrowing to improve blood flow. Target's Stealth balloon angioplasty
micro-catheter utilizes a proprietary single lumen (or channel) design and
incorporates variable shaft stiffness to impart guidewire tracking
characteristics similar to those of the Tracker micro-catheter. Target believes
that other balloon angioplasty catheters are less maneuverable because they
either use a single lumen with a fixed wire or two lumens -- one to track over
the guidewire and a second to allow infusion of liquids to inflate the balloon
located at the tip of the catheter. Target's trackable, single lumen design and
variable shaft stiffness allow the Stealth to track through tortuous vascular
paths. The Stealth is used to dilate arteries in the brain diseased by
atherosclerotic plaque that are not accessible by conventional angioplasty
catheters. The Stealth and FasSTEALTH micro-catheters are each available in five
balloon diameters and have a domestic list price of $650 and $695, respectively.
 
MARKETS
 
     Interventional Neurology.  Acute stroke is the third leading cause of death
in the United States and a major cause of adult long-term disability. Stroke is
the disruption of blood supply to critical areas of the brain. The reduced blood
flow results in a lack of oxygen to the brain, known as ischemia, and often
causes the loss of normal brain functions. Patients who survive a stroke may
experience partial paralysis or may lose the ability to speak or comprehend
language. Strokes are
 
                                       50
<PAGE>   53
 
typically caused either by ruptures (hemorrhagic stroke) or blockages
(vaso-occlusive stroke) of arteries within or leading to the brain.
 
     Hemorrhagic strokes are generally caused by the rupture of arteries
resulting from vascular defects such as cerebral aneurysms or AVMs. Cerebral
aneurysms and AVMs are estimated to occur in one-half of one percent to five
percent of the general population in the United States. Without treatment, these
vascular defects typically grow with time and may cause a variety of symptoms or
may remain asymptomatic until they rupture. In some people, these defects never
become symptomatic or rupture. The treatment of hemorrhagic stroke typically
requires highly invasive neurosurgery, which involves the opening of a portion
of the skull, manipulation of the brain, extensive blood loss, prolonged
hospitalization and a long recovery period.
 
     In the case of aneurysms, neurosurgery is generally performed either before
or after an aneurysm ruptures, although many patients who survive a ruptured
aneurysm are not treated surgically due to the high risk of such surgery.
Approximately 18,000 aneurysm surgeries were performed in the United States in
1989. Target's GDC system, used with a Tracker micro-catheter, is a specialized
micro-coil designed for use in aneurysms and is being investigated in clinical
trials. Target believes the GDC system may in certain cases be an effective,
minimally invasive treatment to lessen blood loss or reduce the risk of a
re-rupture for patients suffering from hemorrhagic stroke due to ruptured
aneurysms, or as prophylactic treatment for nonsurgical patients by embolizing
aneurysms prior to rupture.
 
     Approximately 4,000 AVMs were surgically removed in the United States in
1989. Target's micro-coils enable interventional physicians to occlude AVMs
prior to surgery. After occluding the vessels of or leading to an AVM, the
neurosurgeon may perform surgery to remove the abnormal vasculature more rapidly
and with significantly less blood loss than if the surgery was performed without
first using the micro-coil, greatly reducing the attendant surgical risks. In
some cases, the micro-coils may occlude the AVM completely and highly-invasive
surgery can be avoided.
 
     Vaso-occlusive stroke is typically caused by the existence of a blood clot
within an artery causing a complete blockage of blood flow or by the narrowing
of blood vessels due to the formation of atherosclerotic plaque on the inside of
vessel walls, causing a reduction in the flow of blood and increasing the risk
that a blood clot will cause a complete blockage.
 
     There are a number of conventional treatments for cerebral atherosclerotic
disease. Pharmacologic treatment using drugs to dilate narrowed vessels often
has limited effectiveness, especially in highly diseased blood vessels. Vascular
surgery to remove the atherosclerotic tissue within a diseased artery has proven
to be somewhat more effective but currently is limited to blood vessels within
the neck. Arteries within the brain are generally too small and difficult to
reach for this procedure and have typically been treated by highly invasive
bypass grafting techniques. Balloon angioplasty, which is considered to be less
invasive and more cost-effective as a means of treating coronary
atherosclerosis, has not been used extensively to treat cerebral atherosclerosis
primarily due to the limitations of standard catheter systems. The Company is
not aware of any balloon catheter currently on the market indicated for cerebral
angioplasty. Target's Stealth micro-catheter has been cleared by the FDA for
performing minimally invasive balloon angioplasty procedures to access and
dilate small vessels of the peripheral vascular system to permit the restoration
of normal blood flow.
 
     The conventional treatment for a cerebral blood clot involves the use of
thrombolytic drugs. However, such drugs appear to be relatively ineffective when
delivered intravenously and may cause significant bleeding in other parts of the
body as a side effect. Certain of Target's catheter products are cleared for
delivery of therapeutic agents, but additional clearances must be obtained with
respect to the use of a particular drug to treat a specific indication.
Similarly, Target believes that its Soft Stream micro-catheter may be used to
deliver certain therapeutic agents through perforations in its side holes
directly to a disease site. By delivering such agents through the side-hole zone
of the micro-catheter, the entire length of the diseased area can be treated at
once, potentially accelerating
 
                                       51
<PAGE>   54
 
treatment. Regulatory clearance of Target's catheter products for site-specific
drug delivery will depend in part on clinical proof of efficacy and safety, and
there can be no assurance that such clinical proof will be obtained. While
Target is aware that others are conducting or planning to conduct such studies,
Target does not currently intend to initiate independent studies in this area.
 
     Peripheral Vascular Intervention.  Target's products are used to treat many
site-specific disorders affecting the peripheral vascular system. These
disorders, which include gastro-intestinal bleeding, peripheral vascular blood
clots, internal bleeding from trauma, and peripheral AVMs and other
malformations, are not easily accessible by conventional catheters and therefore
have traditionally been treated by highly invasive surgery. Tracker
micro-catheters can be used to deliver embolizing agents or devices to address
certain cases of gastro-intestinal bleeding, trauma-induced bleeding or AVMs and
other malformations. Occluded peripheral vessels can be treated by dilation
using a Stealth balloon angioplasty micro-catheter in the case of
atherosclerosis.
 
     Target's infusion micro-catheters are also being used to treat liver
cancer, primarily in Japan where the incidence of that disease is relatively
high. The micro-catheters are used to deliver embolizing agents to the blood
vessels that iced the tumor to reduce or eliminate its blood supply. Although
not curative, such treatment may contribute to an improved quality of life for
such patients.
 
MARKETING AND SALES
 
     Target's marketing strategy is designed to promote awareness of the
clinical efficacy and cost-effectiveness of the minimally invasive
interventional procedures in which Target's products are employed. Target
implements this strategy by providing clinical and technical information to its
sales force and worldwide distributors that encourages the interventionalist to
perform procedures utilizing Target's products. Target places particular
marketing emphasis on physician assistance and support for physician training.
 
     In North America, the typical user of Target's products is the
interventional neuroradiologist. Target believes that the number of
interventional neuroradiologists and neurosurgeons trained to use its vascular
access and delivery products to treat neurovascular disorders is relatively
small and the growth in the number of neuro-interventional physicians is
constrained by the lengthy training programs required to educate these
physicians in the United States. Target supports these programs through
consultation with these practitioners. The expansion of these training programs,
and increased usage of Target's products by these practitioners, are important
factors in the growth of Target's domestic market for treating neurovascular
disorders with its products. In addition, an important source of product
promotion comes from referrals within the medical community. As of December 31,
1994, there were ongoing programs training approximately 30 fellows at 15
teaching hospitals in North America. Target believes that future growth in the
United States market also depends significantly on the unpredictable, costly and
time-consuming process of obtaining regulatory clearance to market its products,
such as the GDC system, which is awaiting regulatory clearance. See
"-- Government Regulation and Product Testing."
 
     Internationally, Target's products are typically used by interventional
neuroradiologists, neurosurgeons, cardiologists and peripheral vascular
radiologists. These practitioners provide peer training, expanding the use of
Target's products. To date, Target is not aware of any formal fellowship
programs outside of the United States. However, there are several interventional
centers where physicians are trained in the field of interventional
neuroradiology.
 
     Future growth of the market for Target's neurovascular micro-catheters,
guidewires and micro-coils will depend upon success in obtaining necessary
regulatory clearances and expansion of the number of trained interventional
practitioners. To the extent that physicians do not adopt these products for use
in treating neurovascular disorders or sufficient physicians are not trained in
the use of Target's products, both in the United States and abroad, the market
for Target's products will remain limited.
 
                                       52
<PAGE>   55
 
     Of the 1,500 hospitals in the United States providing interventional
radiology services, approximately 450 provide some treatment for neurovascular
disease. Approximately 100 hospitals in the United States accounted for a
substantial portion of Target's domestic revenues in the fiscal year ended March
31, 1994. Internationally, approximately 225 centers provide neurointerventional
therapy. In Japan, the majority of cases are performed by neurosurgeons trained
in these techniques.
 
     Sales to customers outside North America are made through a network of 30
international specialty distributors, Target's new German subsidiary and the
Japanese joint venture with CMI, both of which are described below. Target
promotes its products through trade shows, seminars, publications and direct
mailings to interventional practitioners. Export product sales accounted for
69%, 60%, 61% and 56% of total product sales for the nine months ended December
31, 1994 and the fiscal years ended March 31, 1994, 1993 and 1992, respectively.
Target anticipates that product sales to customers in Europe and Japan will
generate a large portion of total product sales through at least fiscal 1996.
Target's international operations are subject to certain risks common to foreign
operations in general, including governmental regulations, reimbursement
practices, and import and export restrictions. Changes in such governmental
regulations or import and export restrictions could adversely affect sales of
Target's products and Target's results of operations. See "Risk Factors Relating
to Target -- Importance of Foreign Sales."
 
     In addition to selling its own products, Target has exclusive rights in the
United States and Canada to distribute Balt's Magic line of flow-assisted
catheters, guiding-catheters and catheter valve introducers. The agreement
between Target and Balt, effective in June 1992, has an initial term of three
years and is renewable at the option of Target for an additional three-year term
if certain sales and regulatory milestones are achieved.
 
     In 1991, Target formed a distribution joint venture with CMI in order to
provide Target a direct presence in Japan. CMI initially contributed
approximately $200,000 for a 100% ownership in the joint venture, and in
November 1992, CMI sold a 50% ownership in the joint venture to Target for
approximately $120,000. The joint venture, Target-CMI, Inc., commenced selling
in Japan certain of Target's products for coronary applications in December 1991
and Target's products for neurology and peripheral vascular intervention in
April 1992. Sales to CMI accounted for approximately 29% and 27% of Target's
product sales for the years ended March 31, 1994 and 1993, respectively.
 
     In October 1994, Target acquired certain assets and liabilities of the
former distributor of Target's products in Germany. Target has formed a
subsidiary that is responsible for the direct sales operations of Target in
Germany.
 
MANUFACTURING
 
     Target's manufacturing organization fabricates certain proprietary
components of Target's products and assembles, inspects, tests and packages all
components into finished products. By designing and manufacturing all of its
products from raw materials, Target believes it maintains greater control of
quality and manufacturing process changes and is better able to limit outside
access to its proprietary technology.
 
     Target believes that its custom-designed, proprietary process equipment is
an important component of its manufacturing strategy. In some cases, Target has
added proprietary software to standard equipment and, in others, has developed
proprietary enhancements for existing production machinery to facilitate the
manufacture of its products to exacting standards. Target has also developed
core manufacturing technologies and processes, including (i) proprietary
extrusion techniques and equipment and polymer processing capabilities,
including composite lamination, welding of dissimilar materials,
balloon-forming, tubing expansion and silicone-coating, and (ii) proprietary
precision guidewire grinding techniques enabling fabrication of a large variety
of guidewire core profiles using many core alloys, thermal treating, variable
pitch spring winding and soldering. Other areas of Target's technological
expertise include braiding, teflon-spray coating, hydrophilic coatings,
electroplating and material cleaning and surface preparation.
 
                                       53
<PAGE>   56
 
     Most of Target's subassemblies and products are assembled and tested in a
controlled clean-room environment by trained production personnel. At various
assembly stages each lot of product undergoes thorough testing to ensure
compliance with applicable regulations. Target's quality assurance group
independently verifies that product fabrication and inspection process steps
meet Target's specifications and applicable regulatory requirements. Upon
successful completion of these tests, the products are sterilized, packaged and
prepared for shipment.
 
     Raw materials utilized in Target's products are purchased from outside
vendors. Target's manufacturing group procures, tests and inspects all raw
materials used in Target's products. Target relies on single sources for certain
of its key components. Target believes, however, that alternative sources for
these components are available and generally maintains adequate raw material
inventory supply to avoid product flow interruptions. Nevertheless, any
unanticipated interruption in the supply of these components could have a
material adverse effect on Target.
 
PRODUCT DEVELOPMENT
 
     Target's product development strategy is to improve its current products
and to develop new products to meet the needs of physicians performing small
vessel interventional procedures. Target is developing new products and enhanced
versions of its existing products to perform an expanded range of diagnostic and
therapeutic procedures within Target's core interventional neurovascular and
peripheral vascular markets. Target's future success will depend upon, among
other factors, its ability to develop or acquire from third parties, introduce
and manufacture new products or enhanced versions of, or new uses for, existing
products, and to obtain regulatory clearance on a timely basis for such
products.
 
     For the embolization of peripheral aneurysms and AVMs, Target has developed
its IDC coils that are detached by mechanical, rather than electrolytic, means
as described above. The initial intended use of the IDC system is the treatment
of AVMs or fistulae. Target is currently planning clinical trials, the results
of which will be used as support for a future filing with the FDA in order to
obtain market clearance in the United States. The IDC system may have
applications where speed of detachment is important or where a high degree of
accuracy of placement is not as critical. Target has three patents relating to
the IDC system and has acquired rights from a third party with respect to an
IDC. The IDC system is currently being marketed commercially in Japan as the
Mechanical Detachable Coil.
 
     Target believes its technology may be used for applications other than
those currently marketed or currently in Target's product pipeline. For example,
in December 1992, Target formed a partially owned subsidiary, Conceptus, Inc.,
to focus on the diagnosis and treatment of female and male reproductive
disorders such as infertility and impotence. As of December 31, 1994, Target
held an approximate 20% equity position in Conceptus with an option to increase
this ownership position in the future by exercising a warrant for Conceptus
common stock. The warrant is exercisable at any time on or before December 1996
subject to acceleration upon the occurrence of certain events. In return, Target
has granted to Conceptus certain rights to its current and future proprietary
technologies for exclusive use in developing and commercializing products for
application in the field of reproductive physiology. In March 1994, Conceptus
completed a second round of financing.
 
     In May 1993, Target formed another partially owned subsidiary, Cardima,
Inc. ("Cardima"), which is engaged in the development of products for diagnosis
and treatment of cardiac rhythm disorder. As of December 31, 1994, Target held
an equity interest in Cardima of approximately 30%. Target has granted Cardima
certain rights to its current and future proprietary technologies for exclusive
use in developing and commercializing products primarily for electrophysiology
applications.
 
     In June 1993, Target, along with Collagen and Celtrix, formed another
partially owned subsidiary, Prograft Medical, Inc. ("Prograft"), by contributing
cash and granting certain rights to its current and future proprietary
technologies for exclusive use in developing and commercializing products for
applications in the field of vascular prostheses. Prograft is focusing its
development
 
                                       54
<PAGE>   57
 
efforts on vascular stents (devices that hold arteries open from within), grafts
(that allow for the repair of narrowed, blocked or weakened arteries and veins)
and stent-grafts. As of December 31, 1994, Target held approximately 32% of the
equity in Prograft. In July and August of 1994, Prograft partially completed a
second round of financing.
 
     Target's expenditures for research and development totaled approximately
$7.6 million, $6.5 million and $4.3 million in the years ended March 31, 1994,
1993 and 1992, respectively. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations of Target."
 
COMPETITION
 
     The medical device industry is characterized by rapidly evolving technology
and competition. Target currently experiences competition in the interventional
neuroradiology market and expects such competition to increase substantially.
Target believes that procedures using its interventional products, including the
recovery period, are substantially less costly than highly invasive, traditional
surgical procedures and may ultimately replace these procedures in some
applications. In many other applications, Target's products can be used prior to
surgery to enable the physician to perform procedures less invasively, with
greater efficiency and reduced patient trauma in a shorter period of time.
Several companies in the United States, including large companies with resources
significantly greater than those of Target, have introduced products that are
being used in the interventional neuroradiology market. Target is also aware of
other companies that may pursue commercialization of products which may compete
with Target's products and may result in future pricing and margin pressures
within this market. There can be no assurance that these companies will not
succeed in developing technologies and products that are more effective than any
which have been or are being developed by Target or that would render Target's
technologies or products obsolete or not competitive.
 
     The cardiovascular and peripheral vascular interventional markets are
substantially more developed than the neuroradiology market and are subject to
intense competition. There are many large companies with significantly greater
financial, manufacturing, marketing, distribution and technical resources, and
experience than Target focusing principally on cardiovascular and peripheral
applications for their catheter technologies. As a result, Target focuses its
product development and marketing strategies on market segments where Target's
small vessel access and delivery systems can be used in applications not
presently addressed by conventional catheter and other interventional products.
There can be no assurance, however, that competitors will not successfully enter
these markets with superior products. In addition, Target is aware of several
other companies that have introduced guidewires to the marketplace and
attributes the slower growth rate of its guidewire product line to increased
competitive pressures. Such competition could have a material adverse effect on
Target's business, financial condition and results of operations.
 
     Target believes that the primary competitive factors in the market for
interventional small vessel access and delivery products are safety, efficacy,
ease of use, reliability, innovation and price. In addition, Target believes
that customer service and physician relationships, as well as the time in which
companies can develop products, complete the clinical testing and regulatory
clearance process, and supply commercial quantities of the products to the
market are important competitive factors.
 
PATENTS, TRADE SECRETS AND LICENSES
 
     Target's policy is to protect its proprietary position by, among other
methods, filing United States and foreign patent applications to protect
technology, inventions and improvements that are important to the development of
its business. As of March 15, 1995, Target held or was the exclusive licensee of
35 issued United States patents and had 33 United States and numerous foreign
patents issued and applications pending covering various aspects of its products
and core technology. The
 
                                       55
<PAGE>   58
 
issued patents relate to the variable stiffness design of Target's Tracker
micro-catheters, the patent for which expires in April 2005, and other important
aspects of Target's technologies. No assurance can be given that pending patent
applications will be approved or that any patents will provide competitive
advantages for Target's products or will not be challenged or circumvented by
competitors. In order to preserve its competitive position, it is Target's
intent to actively pursue any patent infringement issues of which it becomes
aware.
 
     Target also relies upon trade secrets and technical know-how and continuing
technological innovation to develop and maintain its competitive position.
Target typically requires its employees, consultants and advisors to execute
appropriate confidentiality and assignment of inventions agreements in
connection with their employment, consulting or advisory relationship with
Target. There can be no assurance, however, that these agreements will not be
breached or that Target will have adequate remedies for any breach. Furthermore,
no assurance can be given that competitors will not independently develop
substantially equivalent proprietary information and techniques or otherwise
gain access to Target's proprietary technology, or that Target can meaningfully
protect its rights in unpatented proprietary technology.
 
     Target was founded in June 1985 as a corporate joint venture between
Collagen and Eli Lilly and Company ("Lilly"). In January 1988, Lilly sold its
interest in Target to Collagen. In connection with the transfer of ownership,
Lilly and its wholly owned subsidiary, Advanced Cardiovascular Systems, Inc.
("ACS"), transferred to Target all rights to certain patents and confidential
information developed through the transfer date by the joint venture.
Additionally, Target granted to Lilly and ACS a royalty-free worldwide license
to make, use and sell products, other than in the field of therapeutic
embolization, under certain patents and know-how relating to the Taper
guidewire. Such license is exclusive, except that Target retained a
non-exclusive, royalty-free worldwide right under such patent rights and
know-how to make, have made, use and sell products, other than in the field of
diagnosis and treatment of coronary angioplasty. Lilly and ACS further agreed
not to assert against Target any intellectual property right relating to
Target's Tracker micro-catheter and Taper guidewire, or any products
substantially similar to such products and for the applications for which such
products were then being used.
 
     In June 1990, Target obtained an exclusive, worldwide, royalty-bearing
license from The Regents of the University of California to certain pending
patent applications relating to the construction and method of use of the GDC
system. The license requires Target to make certain minimum payments and to pay
a royalty based on net sales of products utilizing the licensed technology. This
license extends for the life of the patents unless terminated earlier in the
event of Target's breach of certain covenants or agreements, including failure
to obtain regulatory clearance or market the GDC system within specified
periods. Under the license, the licensor retained the rights to use the
invention and associated technology for educational and research purposes.
 
     In March 1992, Target obtained an exclusive, worldwide, royalty-bearing
license to certain inventions, technical information, know-how and patents which
may issue with respect to an endovascular retrieval device. Target commenced
marketing a product using this technology, the Retriever endovascular snare, in
June 1992. The license requires Target to pay a royalty based on net sales of
products utilizing the licensed technology. The license extends for the life of
the patents, after which Target shall have a royalty-free, paid-up license.
 
     In October 1992, September 1993 and March 1994, Target obtained certain
royalty-bearing licenses to certain inventions, technical information, know-how
and patents with respect to the surface treatment of guidewires, temporary-use
infusion catheters, devices used to introduce other neurovascular catheters or
embolics and for a balloon dilatation catheter. Such licenses are non-exclusive
except for infusion catheters sold exclusively for neurovascular infusion usage.
Target commenced marketing an infusion catheter product line using this
technology, the FasTRACKER product family, during fiscal 1994 and in the third
quarter of fiscal 1995 introduced a line of guide catheters used to introduce
other neurovascular catheters, the FasGUIDE product family, using this
technology. These licenses require Target to make certain minimum payments and
to pay royalties
 
                                       56
<PAGE>   59
 
based on net sales of products utilizing the licensed technology. The licenses
extend for the life of the patents but may be terminated at Target's discretion
with no future right to the technology. Target has not yet commenced sales of
guidewires or balloon dilatation products which use this technology.
 
     In addition to the licenses described above, Target may, in the future,
license from third parties rights to certain products and processes related to
Target's business.
 
     The patent which relates to the variable stiffness design of Target's
Tracker micro-catheters (the "Tracker patent") has been the subject of
reexamination proceedings in the United States Patent and Trademark Office
("PTO"). The first such proceeding was concluded on November 15, 1994, when the
PTO issued a reexamination certificate and confirmed the patentability of the
patent claims set forth in the certificate. The second reexamination of the
patent was initiated by a subsidiary of Boston Scientific Corporation and one of
Target's competitors, SciMed Life Systems, Inc. ("SciMed"), raising new issues
of patentability. A petition for a third reexamination was filed recently by the
same competitor alleging another issue of patentability and requiring the merger
with the second reexamination. Both proceedings are currently pending in the
PTO. No assurance can be given that the PTO will issue a reexamination
certificate confirming the patentability of the patent claims, or that the
patent claims will not be amended in ways that will reduce any competitive
advantages the Tracker patent has provided for Target's products.
 
     During the last half of calendar 1994, Target learned that two of its
United States competitors had commenced sales in the United States of
micro-catheters that Target believes infringe the Tracker patent. On November 9,
1994, Target filed a lawsuit against SciMed and Cordis Endovascular Systems,
Inc. in the United States District Court in San Jose, seeking damages and
preliminary and permanent injunctive relief against further infringing sales.
The defendants responded, challenging the validity of the Tracker patent,
denying infringement, and raising other defenses. The Court has stayed the
lawsuit until the pending reexamination proceedings have been completed in the
PTO. There can be no assurance that Target will be successful in this action or
that even if Target receives a favorable ruling in the pending reexamination,
the defendants will not prevail in this lawsuit.
 
     Target is also aware that at least one competitor in Europe has sold
micro-catheters that may infringe a patent that could issue on Target's patent
application which is pending in the European Patent Office. Target is
investigating its options for enforcement of its rights with respect to such
infringement. The patent which relates to the variable stiffness design of
Target's Tracker micro-catheter is being opposed in Japan by an undisclosed
party.
 
GOVERNMENT REGULATION AND PRODUCT TESTING
 
     Target's research and development activities are subject to regulation by
numerous governmental authorities in the United States and other countries, and
the production and marketing of any products developed by Target are also
significantly regulated, particularly as to safety and efficacy. In the United
States, medical device products are subject to rigorous FDA review. The Federal
Food, Drug, and Cosmetic Act (the "FDC Act"), the Public Health Service Act and
other federal statutes and regulations govern or influence the testing,
manufacture, safety, labeling, storage, record keeping, market clearance,
advertising and promotion of such products. Non-compliance with applicable
requirements can result in fines, civil penalties, injunctions, suspensions or
losses of regulatory clearance, recall or seizure of products, operating
restrictions, refusal of the government to approve product license applications
or allow Target to enter into supply contracts, and criminal prosecution.
 
     Certain of Target's products are sold pursuant to IDEs obtained from the
FDA. According to IDE regulations, sale of the applicable device for clinical
use may not constitute commercialization. As a result, Target sells products
subject to an IDE at prices which allow only for the recovery of research and
development, manufacturing and handling costs. In addition, products sold under
an IDE are limited by the FDA as to the number of investigation sites and the
number of patients treatable in clinical trials.
 
                                       57
<PAGE>   60
 
     In the United States, Target currently sells the GDC system pursuant to an
IDE. Target submitted a 510(k) application in March 1995 regarding the GDC
system that includes clinical data on approximately 800 patients. See
"-- Products -- Micro-Coils."
 
     In order to obtain FDA clearance of a new medical device, Target must
submit proof of safety and efficacy. In most cases, such proof entails extensive
pre-clinical, clinical and laboratory tests. The testing, preparation of
necessary applications and processing of those applications by the FDA is
expensive and time consuming and may take several years to complete. There is no
assurance that the FDA will act favorably or quickly in making such reviews, and
significant difficulties or costs may be encountered by Target in its efforts to
obtain FDA clearance that could delay or preclude Target from marketing any
product it may develop. The FDA may also require post-marketing testing and
surveillance to monitor the effects of proposed products or place conditions on
any clearance that could restrict commercial applications of such products.
Product clearances may be withdrawn if compliance with regulatory standards is
not maintained or if problems occur following initial marketing. In addition,
delays imposed by the governmental review process may materially reduce the
period during which Target may have the exclusive right to commercialize
patented products or technologies.
 
     The two principal methods by which medical devices may be submitted to the
FDA for clearance to market include a premarket notification filing under
Section 510(k) and a PMA application. To obtain a PMA, the applicant is required
to submit clinical data to the FDA, and the FDA may also request that a 510(k)
include clinical data. Before beginning a clinical study, the applicant must
submit an IDE application to the FDA for approval. The IDE application requires
that in vitro and in vivo animal tests be completed in order to demonstrate
sufficient safety of the product. Clinical studies must be done under a clinical
protocol with assurance of adherence to the protocol, informed consent from
clinical subjects, approval of an Institutional Review Board, maintenance of
required documentation, proper monitoring and appropriate statistical
evaluations.
 
     Applications under the 510(k) procedure must demonstrate substantial
equivalence to a device that was on the market prior to the Medical Device
Amendments of 1976 or to devices marketed thereafter under the 510(k) procedure.
Applicants must defer marketing until a favorable response to the 510(k) is
received from the FDA. While reviewing the 510(k), the FDA may require
additional data, which can have the effect of materially extending the time
required to commence marketing. Each 510(k) for a separate application may
require the submission of clinical data concerning human patients relating to
the safety and the effectiveness for each specific proposed medical use. The FDA
may also refer the device to an advisory panel of experts for consideration and
recommendation, which may delay the 510(k) clearance process.
 
     The preparation and processing of a PMA application is significantly more
complex and time consuming than a 510(k). Once the clinical investigation is
completed, Target must assemble and submit to the FDA a significant quantity of
clinical, animal testing, manufacturing, and other data. The PMA clearance
process may take several years or longer and no assurance can be given
concerning the ultimate outcome of PMAs submitted by an applicant. In addition,
there can be no assurance that required clearance from the FDA for any proposed
potential medical use will be granted, or that the FDA process will not be
unduly expensive or lengthy.
 
     To date, all of Target's FDA marketing clearances for commercially
available products have been obtained through the 510(k) process. It is possible
that future potential applications of existing products or that future products
may require PMA clearance, with corresponding increases in the costs and tune
required to obtain governmental clearance.
 
     Target is also required to register as a medical device manufacturer with
the FDA and state agencies. Target is subject to inspection on a routine basis
by both the FDA and the State of California for compliance with the FDA's
current Good Manufacturing Practice ("GMP") regulations. Under GMP regulations,
Target is subject to certain procedural and documentation requirements with
respect to manufacturing and control activities, and Target's manufacturing
facilities are
 
                                       58
<PAGE>   61
 
subject to periodic inspections by the FDA, as well as by state and foreign
regulatory authorities. Target's existing facilities have been inspected by the
FDA in the past. Target believes its manufacturing facilities are in compliance
in all material respects with all applicable local, state and federal
regulations.
 
     Target must also comply with various FDA requirements for design, safety,
advertising, labeling, record keeping and reporting of adverse experiences with
the use of its products. The FDA actively enforces regulations prohibiting
marketing of products for unapproved uses. Failure to comply with applicable
regulatory requirements can result in, among other things, fines, civil
penalties, injunctions, suspensions or loss of clearances, seizures or recalls
of products, operating restrictions, refusal of the government to approve
product license applications or allow Target to enter into supply contracts,
injunctions and criminal prosecutions. Changes in existing requirements or
adoption of new requirements could adversely affect the ability of Target to
comply with regulatory requirements. Failure to comply with regulatory
requirements could have a material adverse affect on Target's business,
financial condition and results of operations.
 
     In addition to regulations enforced by the FDA, Target is also subject to
regulation under the Occupational Safety and Health Act, the Environmental
Protection Act and other present and potential future federal, state or local
regulations. To date, compliance with these regulations has not had any material
effect on its financial results, capital requirements or competitive position.
 
     Sales of medical devices outside the United States are subject to foreign
regulatory requirements that vary widely from country to country. The time
required to obtain clearance required by foreign countries may be longer or
shorter than that required for FDA clearance, and requirements for licensing may
differ significantly from FDA requirements. Some countries have historically
permitted human studies earlier in the product development cycle than
regulations in the United States. Other countries, such as Japan, have standards
similar to those of the FDA. This disparity in the regulation of medical devices
may result in more rapid product clearance in certain countries than in the
United States, while clearance in countries such as Japan may require longer
periods than in the United States. In addition, the European Union has developed
a new approach to the regulation of medical products which may significantly
change the situation in those countries. The receipt or denial of FDA clearance
for a particular product may affect the receipt or denial of regulatory
clearance for that product in certain other countries.
 
     Export sales of investigational devices or devices not cleared for
commercial distribution in the United States are subject to FDA export permit
requirements. In order to obtain such a permit, Target must provide the FDA with
documentation from the medical device regulatory authority of the country in
which the purchaser is located, stating that the sale of the device is not a
violation of that country's medical device laws.
 
PRODUCT LIABILITY LITIGATION AND INSURANCE
 
     Medical device companies are subject to an inherent risk of product
liability and other liability claims in the event that the use of their products
results in personal injury claims. Target's products are often used in the
brain, where there is a high risk of serious injury or death, and in other life-
threatening situations. Such risks will exist even with respect to those
products that have received, or in the future may receive, regulatory clearance
for commercial sale. Target is currently a party to several legal actions
involving product liability claims. While the outcome of these actions is
presently not determinable, it is management's opinion that these matters will
not, either individually or in the aggregate, have a material adverse effect on
Target's business financial condition or results of operations. While Target
seeks to maintain product liability insurance with coverage that Target believes
is comparable to that maintained by companies similar in size and serving
similar markets, there can be no assurance that Target's product liability
insurance will be adequate or that such insurance will remain available at
acceptable costs, or at all. A successful claim brought against Target for which
insurance coverage is denied or in excess of its insurance coverage could have a
material
 
                                       59
<PAGE>   62
 
adverse effect on Target's business, financial condition and results of
operations. Additionally, it is possible that adverse product liability actions
could negatively affect Target's ability to obtain and maintain regulatory
clearance for its products.
 
THIRD-PARTY REIMBURSEMENT
 
     Target's products are purchased by hospitals, which, in the United States,
then bill various third-party payers, including Medicare, Medicaid and private
insurers, for the healthcare services provided to patients. Government agencies
reimburse hospitals for medical procedures at a fixed rate according to
diagnosis-related groups. Federal and state laws and regulations govern
reimbursement by such government agencies. Such laws and regulations also
influence reimbursement by private insurance companies of medical fees. Changes
in current policies could reduce or eliminate such reimbursements and thereby
adversely affect future sales of Target's products. Third-party payers may deny
reimbursement if they determine that the device used in the procedure is
unnecessary, inappropriate, not cost-effective, experimental or for a
non-approved indication. Third-party payers may deny reimbursement for
treatments using Target's products, regardless of the FDA clearance status of
such products. Third-party payers are increasingly challenging the prices
charged for medical products and services. There can be no assurance that
reimbursement from third-party payers will be available, or if available, that
reimbursement will not be limited, thereby adversely affecting Target's ability
to sell its products profitably. Although Target has not experienced any
problems to date, significant uncertainty exists as to the reimbursement status
of newly approved health care products and the current political issues being
addressed by the Clinton Administration, and there can be no assurance that
adequate third-party coverage will be available to patients. Similar
circumstances exist in many international markets and are subject to various
foreign health care policies. In such circumstances, sales of Target's products
could be adversely affected.
 
EMPLOYEES
 
     As of December 31, 1994, Target had 317 full-time and part-time employees,
including 49 in research and development, 19 in regulatory, clinical and quality
assurance, 181 in manufacturing and quality assurance, 41 in sales, marketing
and customer service and 27 in finance and administration. Target is dependent
upon a limited number of key management and technical personnel. Target's future
success will depend in part upon its ability to attract and retain highly
qualified personnel. Target competes for such personnel with other companies,
academic institutions, government entities and other organizations. Target
attempts to maintain competitive compensation, benefits, equity participation
and work environment policies to assist in attracting and retaining qualified
personnel as Target believes that the success of its business will depend, in
part, on its ability to attract and retain such employees. None of Target's
employees is covered by a collective bargaining agreement. Target believes its
relationship with its employees is good.
 
PROPERTIES
 
     In October 1991, Target signed a ten-year lease for a 76,000 square foot
building in Fremont, California and in early fiscal 1993, consolidated its
operations in this facility. In October 1994, Target subleased from Cardima, for
a period of two years with the option to extend, certain space in Cardima's
Fremont location primarily to be utilized for Target's finished goods storage
and shipping needs. Target believes that these facilities will be adequate to
meet its requirements through at least calendar 1995. Target currently
anticipates that it will require additional office space in calendar 1996 and is
currently reviewing alternatives to handle its anticipated future space
requirements.
 
                                       60
<PAGE>   63
 
                             MANAGEMENT OF COLLAGEN
 
     The directors and executive officers of Collagen and their ages as of March
15, 1995 are as follows:
 
<TABLE>
<CAPTION>
                NAME                     AGE                        POSITION
-------------------------------------    ---      ---------------------------------------------
<S>                                      <C>      <C>
Howard D. Palefsky...................    47       Chairman of the Board and Chief Executive
                                                  Officer
Gary S. Petersmeyer..................    47       President, Chief Operating Officer and
                                                  Director
Frank A. DeLustro, Ph.D..............    46       Senior Vice President, Scientific Affairs
Ross R. Erickson.....................    49       Vice President, Regulatory Affairs and
                                                  Quality Assurance
Deborah W. Berard....................    35       Vice President, Human Resources and
                                                  Administrative Services
David Foster.........................    37       Vice President, Finance & MIS, and Chief
                                                  Financial Officer
A. Neville H. Pelletier..............    53       Vice President and Managing Director, Europe
William C. Miller....................    57       Vice President and General Counsel
Michael Levitt.......................    44       Vice President, Operations
Reid W. Dennis(1)....................    68       Chairman Emeritus of the Board
Anne L. Bakar(1).....................    37       Director
John R. Daniels, M.D.................    56       Director
William G. Davis(1)..................    62       Director
Craig W. Johnson(2)..................    48       Director
Terry R. Knapp, M.D..................    51       Director
Michael F. Mee(2)....................    52       Director
Rodney Perkins, M.D..................    58       Director
Cornelius W. Pettinga, Ph.D.(1)......    72       Director
Roger H. Salquist(2).................    52       Director
</TABLE>
 
---------------
 
(1) Member of the Human Resources Committee of the Board of Directors.
 
(2) Member of the Audit Committee of the Board of Directors.
 
     Mr. Palefsky joined Collagen as President, Chief Executive Officer and
Director in March 1978 and served in such capacities until February 1995, when
he became the Chairman of the Board and Chief Executive Officer. From 1973 to
March 1978, Mr. Palefsky was employed by Alza Corporation where his last
position was Vice President, Marketing. Prior to 1973, Mr. Palefsky was employed
by Whitehall Laboratories as Assistant to the President. Both Alza Corporation
and Whitehall Laboratories are manufacturers of pharmaceutical products. Mr.
Palefsky is also a director of Calgene, Inc. and Target. Calgene, Inc. is an
agribusiness biotechnology company.
 
     Mr. Petersmeyer joined Collagen as President, Chief Operating Officer and
Director in February 1995. Prior to joining Collagen, Mr. Petersmeyer was
employed by Syntex Corporation, a manufacturer of pharmaceutical products, from
1991 to January 1995, where he served as Vice President of Managed Health Care
from March 1993 to January 1995, as well as serving at various times as National
Sales Director and Director of Corporate Development. From 1986 to 1990, he
served as President and Chief Executive Officer of Beta Phase, Inc., a medical
device manufacturer, and from 1982 to 1986 he was the Executive Vice President
and General Manager, Ophthalmic Products Division, of CooperVision, Inc., a
manufacturer and distributor of ophthalmic products.
 
     Dr. DeLustro joined Collagen as Manager of Immunology in June 1983 and has
served in various positions in Collagen. In 1991, Dr. DeLustro was promoted to
Senior Vice President, Scientific
 
                                       61
<PAGE>   64
 
Affairs. Prior to 1983, he was Assistant Professor of Medicine at the Medical
University of South Carolina.
 
     Mr. Erickson joined Collagen as Program Director in January 1987 and served
in various senior regulatory positions. In 1990, Mr. Erickson was promoted to
Vice President, Regulatory Affairs and Quality Assurance. From 1983 to 1986, Mr.
Erickson was employed by Laserscope as Director of Biomedical Affairs. From 1977
to 1983, he was employed by Cobe Laboratories as Manager of Clinical
Evaluations. Both Laserscope and Cobe Laboratories are medical device
manufacturers. From 1970 to 1977, Mr. Erickson was employed by Alza Corporation.
 
     Ms. Berard joined Collagen as a member of the finance staff in February
1982 and served in various human resource positions. In 1991, Ms. Berard was
promoted to Vice President, Human Resources and Administrative Services. Prior
to 1982, Ms. Berard held a position in Medical Development in the Stanford
Medical School.
 
     Mr. Foster joined Collagen as Financial Analyst in November 1984 and served
in various positions in Collagen. In 1992, Mr. Foster was appointed Vice
President of Finance and Chief Financial Officer. From 1979 to 1984, Mr. Foster
was employed by Brown, Vence and Associates, an energy and environmental
consulting firm, as Engineering Project Manager.
 
     Mr. Pelletier joined Collagen in May of 1991 as Vice President of Collagen
International, Inc. In 1992, he was appointed Vice President and Managing
Director, Europe. From 1979 to 1991, Mr. Pelletier was employed by Sandoz AG, a
manufacturer of food products, where his most recent position was Senior Vice
President, Sandoz Nutrition, Inc. During his time at Sandoz, Mr. Pelletier was
based in Minnesota, U.S., Australia and Switzerland. Prior to 1979, Mr.
Pelletier held a variety of marketing positions with Pepsico, Inc., a
manufacturer of beverages; Miles Laboratories, Inc., a manufacturer of
over-the-counter toiletries and micro-nutrients; and Proctor and Gamble, a
manufacturer of consumer products. In addition to Australia and Switzerland, Mr.
Pelletier has spent his international career in Canada, the Philippines,
Venezuela and Spain.
 
     Mr. Miller joined Collagen in October of 1992 as Vice President and General
Counsel. From 1985 to 1992, Mr. Miller was employed by Boehringer Mannheim
United States Holding, Inc., a manufacturer of medical products, as Vice
President, General Counsel and Secretary. From 1981 to 1985, Mr. Miller was
employed by Max Factor & Company, a manufacturer of cosmetics and fragrances, as
Vice President, General Counsel and Secretary. From 1969 to 1980, Mr. Miller was
employed by Xerox Corporation, a manufacturer of photocopying devices, as
Associate General Counsel.
 
     Mr. Levitt joined Collagen in July 1994 as Vice President, Operations.
Prior to joining Collagen, Mr. Levitt was employed by Eli Lilly and Company, a
manufacturer of pharmaceutical products. During his 18 years with Eli Lilly and
Company, Mr. Levitt held positions in sales, research, human resources and
operations. Mr. Levitt's last position with Eli Lilly and Company was Director
of Pharmaceutical Operations.
 
     Mr. Dennis has served as a director of Collagen since 1975. Mr. Dennis
served as President of Collagen from February 1976 to March 1978, as Chairman of
the Board from March 1978 to February 1995, and has served as Chairman Emeritus
of the Board since February 1995. Mr. Dennis is also a director of MiniStor
Peripherals International, Limited.
 
     Ms. Bakar has served as a director of Collagen since 1993. Ms. Bakar has
been President and Chief Executive Officer of Telecare Corporation, the largest
dedicated provider of in-patient psychiatric services in the state of
California, since 1987. Previously, Ms. Bakar spent seven years in the
investment banking industry.
 
     Dr. Daniels has served as a director of Collagen since 1977. Dr. Daniels, a
founder of Collagen, was a Vice President of Collagen from September 1975 to
September 1979. He served as President of Target from June 1985 to April 1989,
and as a director from June 1985 to May 1990. Dr. Daniels is
 
                                       62
<PAGE>   65
 
also the President, Chief Executive Officer and a director of Regional
Therapeutics, Inc. and the Chairman of Balance Pharmaceuticals, Inc.
 
     Mr. Davis has served as a director of Collagen since 1984. Mr. Davis was
associated with Eli Lilly and Company from 1957 to 1984, where he served as
Executive Vice President, Eli Lilly International Corporation, from 1972 to
1975, Executive Vice President, Pharmaceutical Division, from 1975 to 1982 and
President, Medical Instrument Systems Division, from 1982 until his retirement
in 1984. Mr. Davis is also a director of Abiomed, Inc., Alza Corp., Endosonics,
Inc. and Target.
 
     Mr. Johnson has served as a director of Collagen since 1991. Mr. Johnson
has been a Director in Venture Law Group, A Professional Corporation, principal
outside counsel to Collagen, since February 1993. From 1980 to February 1993,
Mr. Johnson was a member of the law firm of Wilson, Sonsini, Goodrich & Rosati,
Professional Corporation, principal outside counsel to Collagen during such
period. He was appointed Secretary of Collagen in August 1986. Mr. Johnson
served as Assistant Secretary of Collagen for ten years prior to his appointment
as Secretary. Mr. Johnson is also a director of Retix.
 
     Dr. Knapp has served as a director of Collagen since 1990. Dr. Knapp, a
founder of Collagen, has served as Chairman of the Board of Directors, President
and Chief Executive Officer of LipoMatrix, Incorporated, a developer of
alternative breast implants, since February 1992. He was a director and
President of Centers for Human Appearance, Inc., a developer of medical device
products, from February 1989 to November 1993. Dr. Knapp was also President of,
and a surgeon with, Northern California Plastic Surgery Medical Group, Inc. from
1977 until 1993.
 
     Mr. Mee has served as a director of Collagen since 1986. Mr. Mee served as
a director of Collagen from August 1981 to January 1985 and was re-elected to
the Board in June 1986. He joined the Norton Company, a multinational
manufacturer, in January 1985 as Vice President, Finance and served as a
director, Vice President, Finance and Chief Financial Officer of that company
through January 1990. In February 1990, Mr. Mee joined Wang Laboratories, Inc.,
a computer manufacturer, as the Executive Vice President, Finance, Chief
Financial Officer and a director and subsequently served as Chairman of the
Board of Directors and Chief Financial Officer of that company. He joined
Bristol-Myers Squibb Company, a diversified producer and distributor of
pharmaceutical products, medical devices, non-prescription health products,
toiletries and beauty aids, as Senior Vice President and Chief Financial Officer
in March 1994.
 
     Dr. Perkins has served as a director of Collagen since 1975. Dr. Perkins, a
founder of Collagen, served as President of Collagen from September 1975 to
November 1975. He is a Clinical Associate Professor of Surgery at the Stanford
University Medical Center and President of the California Ear Institute.
 
     Dr. Pettinga has served as a director of Collagen since 1987. Dr. Pettinga
served with Eli Lilly and Company from 1949 to 1986, most recently as a director
and as Executive Vice President. Since 1987 he has served as a consultant to
Great Lakes Chemical Corporation, a world-wide chemical manufacturer. He is also
a director of Atrix Laboratories, Wyckoff Chemical Company and Celtrix
Pharmaceuticals, Inc.
 
     Mr. Salquist has served as a director of Collagen since 1988. Mr. Salquist
has served as Chief Executive Officer and a director of Calgene, Inc., an
agribusiness biotechnology company, since November 1985, and is currently
Chairman of the Board of Directors of that company. He is also Chairman of the
Board of Directors of Celtrix, and a trustee of the Fidelity Investments
Charitable Gift Trust.
 
                                       63
<PAGE>   66
 
                              MANAGEMENT OF TARGET
 
     The directors and executive officers of Target and their ages as of March
15, 1995 are as follows:
 
<TABLE>
<CAPTION>
                NAME                     AGE                        POSITION
-------------------------------------    ---      ---------------------------------------------
<S>                                      <C>      <C>
Gary R. Bang.........................    48       President, Chief Executive Officer and
                                                  Director
Erik T. Engelson.....................    35       Senior Vice President, Operations and
                                                  Research and Development
Abhi Acharya, Ph.D...................    53       Vice President, Regulatory, Quality and
                                                  Clinical Affairs
U. Hiram Chee........................    35       Vice President, New Product Development
Robert Hellewell.....................    53       Vice President, Operations
Edward R. LeMoure....................    40       Vice President, International Sales
Timothy C. Mills, Ph.D...............    38       Vice President, New Business Development
Kevin P. Riley.......................    34       Vice President, Worldwide Marketing
A. Larry Tannenbaum..................    43       Vice President, Finance and Administration,
                                                  Chief Financial Officer and Assistant
                                                  Secretary
Charles M. Strother, M.D.............    54       Chairman of the Board
William G. Davis(1)..................    62       Director
Kathleen Murray, M.S.N...............    46       Director
Howard D. Palefsky(2)................    47       Director
Richard D. Randall(1)................    43       Director
John C. Villforth(1)(2)..............    63       Director
</TABLE>
 
---------------
 
(1) Member of the Compensation Committee of the Board of Directors.
 
(2) Member of the Audit Committee of the Board of Directors.
 
     Mr. Bang joined Target in May 1993 as President and Chief Executive Officer
and a director. Prior to joining Target, Mr. Bang worked for Baxter
International, a diversified multinational manufacturer of health care products
("Baxter"), for 19 years. In his most recent position with Baxter, Mr. Bang
served from April 1990 to April 1993 as President of the Pharmaseal Surgical
Division, a world leader in disposable products sold to hospital operating
rooms. Mr. Bang served as President of the Gloves Strategic Business Unit from
November 1989 to April 1990. From October 1986 to November 1989, Mr. Bang served
as Vice President, Sales and Marketing of Baxter U.K. in England. Prior to 1986,
he served in various capacities including President, Vice President, Division
Controller of divisions of Baxter, whose products included solutions, dialysis
products and disposable hospital products.
 
     Mr. Engelson joined Target in 1985 as Project Manager. He became Manager of
Research and Development in January 1987 and served in that position until March
1988 when he became Director of Research and Development. He was appointed Vice
President, Research and Development in October 1988 and Senior Vice President,
Operations and Research and Development in September 1992. Prior to joining
Target, Mr. Engelson served as a research and development engineer at ACS, an
intravascular catheter company, from November 1984 to October 1985.
 
     Dr. Acharya joined Target in July 1994 as Vice President, Regulatory,
Quality and Clinical Affairs. Prior to joining Target, he served as Senior
Technical Consultant at Biometrix Research Institute, Inc., a healthcare
consulting firm, from July 1993 until June 1994. Dr. Acharya served as Director
of the Division of Cardiovascular, Respiratory and Neurological Devices at the
FDA from September 1985 until July 1993 and as Senior Reviewer in the FDA's
Office of Device Evaluation from 1977 until September 1985.
 
     Mr. Chee joined Target in September 1987 as Senior Research and Development
Engineer. He became Project Manager in September 1988 and served in that
position until December 1990 when he became Project Director, Research and
Development. He was appointed Vice President, New
 
                                       64
<PAGE>   67
 
Product Development in October 1992. Before joining Target, Mr. Chee held
various engineering positions from June 1983 to September 1987 with the Edwards
Critical Care Division of Baxter.
 
     Mr. Hellewell joined Target in April 1991 as Director of Manufacturing
Engineering and was appointed Vice President, Operations in February, 1993.
Prior to joining Target, he held various professional and management positions
with McGaw Laboratories, a manufacturer of intravenous solutions and related
medical devices, from 1972 until 1991 including Director, Engineering from June
1988 to March 1991. Mr. Hellewell also worked with Proctor and Gamble, a
multinational manufacturer of food products, cleansers and other similar
products, from 1968 to 1972.
 
     Mr. LeMoure joined Target in April 1990 as Vice President, International
Sales. He has been a director of Target-CMI, Inc. since April 1, 1992. From
March 1986 to April 1990, he held various sales and marketing positions with the
Bard Japan Division ("Bard Japan") of Bard, including Senior Product Manager,
Cardiovascular Products from March 1986 to December 1988 and Manager of Sales
and Marketing, Cardiovascular Products from December 1988 to April 1990. Mr.
LeMoure served on the Bard Japan Management Board from 1987 to 1990. Before
joining Bard Japan, Mr. LeMoure was employed with the U.S.C.I. Division of Bard
from 1979 to 1986.
 
     Dr. Mills joined Target in April 1994 as Vice President, New Business
Development. Prior to joining Target, he served as Director of Business
Development of the Interventional Cardiology Division of Baxter from September
1991 to April 1994. Dr. Mills served as Director of the Artificial Heart Program
at the University of California, Irvine Medial Center from September 1988 to
September 1991. From June 1984 to June 1987, he was a research faculty member in
the Department of Radiology at the University of California, San Francisco.
 
     Mr. Riley joined Target in September 1987 as a sales manager. In September
1989, he took on the role of Marketing Manager until October 1992 when he was
promoted to Director of Marketing. In April 1994, Mr. Riley was appointed Vice
President, Worldwide Marketing. Prior to joining Target, Mr. Riley held various
sales positions with Elecath, a manufacturer of invasive electrophysiology
devices, with Davis and Geck Surgical, a manufacturer of surgical products, and
with Baxter.
 
     Mr. Tannenbaum joined Target in May 1992 and was appointed Vice President,
Finance and Administration and Chief Financial Officer June 1, 1992. Mr.
Tannenbaum was appointed Assistant Secretary in October 1992. Prior to joining
Target, Mr. Tannenbaum held various positions with Tandem Computers
Incorporated, a multinational manufacturer of mainframe computers, including
Western Region Business Manager from October 1988 to May 1992 and Manager of
Corporate Finance from May 1987 to October 1988. Mr. Tannenbaum will be stepping
down as Target's Vice President, Finance and Administration and Chief Financial
Officer on or before May 31, 1995.
 
     Dr. Strother joined Target as a member of the Scientific Advisory Board in
October 1989 and was elected a director of Target in May 1990 and Chairman of
the Board of Directors in May 1994. Since July 1976, Dr. Strother has been a
Professor of Radiology, Neurology and Neurosurgery at the University of
Wisconsin.
 
     Mr. Davis, an independent business consultant, has served as a director of
Target since August 1988 and served as Chairman of the Board of Directors from
June 1989 to July 1991. From 1957 to 1984, Mr. Davis was associated with Eli
Lilly & Company, where he served as Executive Vice President, Eli Lilly
International Corporation, from 1972 to 1975, Executive Vice President,
Pharmaceutical Division, from 1975 to 1982, and President, Medical Instrument
Systems Division, from 1982 until his retirement in 1984. Mr. Davis is also a
director of Abiomed, Inc., Alza Corporation, Endosonics Corporation and
Collagen.
 
     Ms. Murray was elected to Target's Board of Directors in February 1995. She
has been employed by Northwestern Memorial Hospital since 1986 and currently
serves as its Executive Vice President and Chief Operating Officer. Prior to
1986, Ms. Murray was Senior Vice President at St. Joseph Hospital.
 
     Mr. Palefsky has served as a director of Target since 1985. He has been
Chief Executive Officer and a director of Collagen since 1978. He is also a
director of Calgene, Inc.
 
                                       65
<PAGE>   68
 
     Mr. Randall joined Target in June 1989 as President and Chief Executive
Officer and a director, and served as Chief Financial Officer of Target from
July 1991 to June 1992. Mr. Randall served as President and Chief Executive
Officer of Target until May 1993 and as Chairman of the Board of Directors of
Target from April 1993 to May 1994. Mr. Randall has served as President and
Chief Executive Officer of Innovasive Devices, Inc., a medical device
manufacturer, since January 1994. Prior to joining Target, he served as Vice
President, Sales and Marketing of Trimedyne, Inc., a cardiovascular laser
company ("Trimedyne"), from March 1987 to March 1989 and as Director of
Marketing from March 1986 to March 1987. Mr. Randall also served as a director
of Trimedyne from February 1988 to June 1989. Before joining Trimedyne, Mr.
Randall served as Senior Product Manager of the Edwards Division of Baxter, from
November 1984 to March 1986. From January 1981 to November 1984, Mr. Randall
held several sales positions with the U.S.C.I. Division of C.R. Bard, Inc., a
medical products company.
 
     Mr. Villforth has served as a director of Target since September 1992. He
has been President of The Food and Drug Law Institute in Washington, D.C., a
non-profit association providing education with regard to FDA regulations, since
January 1991. Prior to that time, Mr. Villforth served as Executive Director of
The Food and Drug Law Institute from September 1990 to January 1991. From July
1982 to September 1990, Mr. Villforth served as Director of the Center for
Devices and Radiological Health at the FDA.
 
                                       66
<PAGE>   69
 
                            DESCRIPTION OF THE NOTES
 
     The Notes will be issued under an Indenture (the "Indenture") dated as of
April   , 1995 between Collagen and The First National Bank of Boston, as
trustee (the "Trustee"). The following description of the terms of the Notes
does not purport to be complete and is subject and qualified in its entirety by
reference to the detailed provisions of the Indenture, a copy of which has been
filed as an exhibit to the Registration Statement. Capitalized terms not defined
herein have the meanings assigned thereto in the Indenture.
 
GENERAL
 
     The Notes will be subordinated unsecured obligations of Collagen limited to
an aggregate principal amount of $45,000,000 (assuming the exercise in full of
the Underwriters' over-allotment option) and will mature on May 1, 2002, unless
earlier redeemed or exchanged. The Notes are exchangeable at any time after 60
days following initial issuance at the option of the holder for shares of Target
Common Stock and/or certain other property attributable to such shares as set
forth below (collectively, the "Exchange Property"). The Notes are not
redeemable prior to May 10, 1998. Thereafter, the Notes are redeemable at the
option of Collagen at the redemption prices set forth herein, plus accrued
interest.
 
     The Notes will bear interest from the date of issuance at the rate per
annum shown on the cover page of this Prospectus, payable semiannually on
November 1 and May 1 of each year, commencing November 1, 1995, to Noteholders
of record at the close of business on the 15th day of October or April preceding
each such interest payment date. Principal of, and premium, if any, and interest
on the Notes will be payable and the Notes may be presented for exchange at the
office of the Exchange Agent, which initially will be the Trustee. The Notes
will be issued only in registered form, without coupons, in denominations of
$1,000 and integral multiples thereof.
 
     The Indenture provides that Collagen will deliver to the Exchange Agent all
of the shares of Target Common Stock currently owned by Collagen initially
required to satisfy the obligations of Collagen upon exchange of the Notes. The
Indenture prohibits Collagen from selling, pledging or distributing the Target
Common Stock and other Exchange Property, except as provided below. However,
Target Common Stock and other Exchange Property deposited with the Exchange
Agent, subject to the contractual rights of the Noteholders set forth therein,
will remain the property of Collagen. Accordingly, the right of a Noteholder to
exchange Notes for Target Common Stock or other Exchange Property may be
adversely affected in the event of a bankruptcy, insolvency or liquidation of
Collagen. In such event the Target Common Stock and other Exchange Property may
be subject to the claims of Collagen's creditors. The Indenture does not contain
any financial covenants or dividend restrictions on Collagen.
 
     Each Note is being offered with original issue discount ("OID") for United
States federal income tax purposes equal to the excess of the principal amount
at maturity of the Note over the amount of the issue price of the Note. For this
purpose, a Note's issue price does not include the portion of the purchase price
of the Note attributable to the right to exchange the Note for Target Common
Stock. Accrued OID will be includible, periodically, in a holder's gross income
for United States federal income tax purposes (in addition to the stated
interest) prior to exchange, redemption, other disposition or maturity of such
holder's Note, whether or not such Notes are ultimately exchanged, redeemed,
sold or paid at maturity. In addition, the exchange of a Note for Target Common
Stock or other Exchange Property will be treated as a taxable disposition of the
Note. See "Certain United States Federal Income Tax Considerations."
 
     As of March 15, 1995, Collagen owned 2,124,194 shares of Target Common
Stock, representing approximately 30% of the outstanding shares of Target Common
Stock. Prior to any exchange of the Notes, Collagen will continue to own the
shares of Common Stock issuable upon exchange of the Notes, and will continue to
exercise many rights, including voting rights, incident to such ownership. As a
result, Collagen may be able to control Target and, as a result of such control,
may
 
                                       67
<PAGE>   70
 
be able to effect transactions that could result in a change in the composition
of the Exchange Property.
 
     The Underwriting agreement provides that Target will use its best efforts
to keep a registration statement covering the Target Common Stock for delivery
upon exercise of the exchange rights continuously effective at all times while
any of the Notes remain outstanding; provided, that Target may upon notice to
the Exchange Agent decline to supplement or amend the registration statement
covering the exchange of Notes for Target Common Stock in certain instances for
not more than 90 days in any 365 day period and other than during the pendency
of any notice of redemption of Notes or after April 25, 2002. No exchange of
Notes for Target Common Stock may be made while such an election by Target is in
effect, and at any time when a Noteholder seeks to exchange Notes for Target
Common Stock, Collagen will be required to pay cash equal to the Market Price
(as hereinafter defined) of the Target Common Stock. Payment of cash and, in
certain instances, Target Common Stock and other Exchange Property receivable
upon exchange by a Noteholder of its Notes will be subject to the subordination
provisions set forth herein and, accordingly, may be delayed or prohibited.
Exchange Property may include securities other than Target Common Stock, and
neither Target nor Collagen will have any obligation to effect any registration
covering the sale of such other securities upon exchange of Notes.
 
EXCHANGE RIGHTS
 
     The Notes are exchangeable at the option of the holder for Target Common
Stock or other Exchange Property at any time after 60 days following issuance
and prior to maturity, conversion or redemption at a price (the "Exchange
Price") initially equal to $          per share of Target Common Stock
equivalent to an exchange rate of           shares of Target Common Stock per
$1,000 principal amount of Notes. The Exchange Price will be proportionately
adjusted upon (a) the payment in shares of Target Common Stock of a dividend or
distribution on Target Common Stock; (b) the combination of outstanding shares
of Target Common Stock into a smaller number of shares of Target Common Stock;
(c) the subdivision of outstanding shares of Target Common Stock into a greater
number of shares of Target Common Stock; or (d) the reclassification of Target
Common Stock resulting in the issuance of any shares of capital stock of Target.
 
     In order to exercise exchange rights, a Noteholder must properly complete
the Exchange Notice provided on the Note and surrender the Note to the Exchange
Agent at the office of the Exchange Agent maintained for such purpose in New
York, New York. The right to exchange Notes will terminate on the fifth day
preceding the redemption date and will be lost if not exercised prior to that
time. No fractional shares or interests in Target Common Stock or other Exchange
Property will be delivered on any exchange of Notes, but in lieu thereof, a cash
adjustment will be paid based on the Market Price (as defined below) of the
Target Common Stock or other Exchange Property.
 
     No payment or adjustment will be made for accrued interest on an exchanged
Note. If any Noteholder surrenders a Note for exchange between the record date
for the payment of an installation of interest and the next interest payment
date, then, notwithstanding such exchange, the interest payable on such interest
payment date will be paid to the holder on such record date. However, in such
event, such Note, when surrendered for exchange, must be accompanied by delivery
by the exchanging Noteholder of a check or draft payable in an amount equal to
the interest payable on such interest payment date on the portion so exchanged.
 
     Deposit of Exchange Property.  Collagen will deliver to the Exchange Agent
all of the shares of Target Common Stock initially required to satisfy the
obligations of Collagen upon exchange of the Notes. The Exchange Property may,
as a result of transactions involving Target Common Stock, subsequently include
cash or property other than or in addition to Target Common Stock. In any such
case, Collagen will deposit with the Exchange Agent from time to time any cash
or other property that may become deliverable as Exchange Property in exchange
for the Notes. Collagen will not be permitted to pledge, mortgage, hypothecate
or grant a security interest in, or permit any
 
                                       68
<PAGE>   71
 
mortgage, pledge, security interest or other lien upon, the Target Common Stock
or other Exchange Property so deposited. However, Collagen will be entitled to
vote the shares of Target Common Stock and any other voting securities which may
constitute Exchange Property so deposited prior to exercise of the exchange
rights relating to such securities.
 
     To the extent the Notes are redeemed prior to exchange or cash is paid in
lieu of delivering shares upon notice of exchange, Collagen will be entitled to
receive from the Exchange Agent any number of shares of Target Common Stock and
other Exchange Property, if any, held by the Exchange Agent for exchange as
exceeds the number of shares of Target Common Stock or other Exchange Property
then required to be held by the Exchange Agent for the exchange of all remaining
Notes then outstanding. The deposit arrangements with the Exchange Agent will
terminate at such time as the right to exchange Notes shall have expired
pursuant to the Indenture.
 
     Collagen's Cash Option on Exchange.  In lieu of delivering Exchange
Property in exchange for any Note, Collagen may pay to the holder surrendering
such Notes, within five business days of receipt by the Exchange Agent of a
Noteholder's notice of exchange, an amount in cash equal to the market price of
the Exchange Property for which such Notes are exchangeable (the "Market
Price"), based on (a) in the case of Target Common Stock or other Exchange
Property which consists of publicly traded securities, the average closing
market price (or average bid and asked prices, if closing prices are not
available) for the five consecutive trading days immediately preceding the date
of receipt by the Exchange Agent of the notice of exchange relating to such
Notes (or, if such date is not a business day, on the business day next
preceding such date), and (b) in the case of Exchange Property which does not
consist of publicly traded securities, the market value of such property on the
date of receipt by the Exchange Agent of the notice of exchange relating to such
Notes, as determined by an investment banking firm selected by the Exchange
Agent. The Indenture provides that Collagen is required to deliver cash equal to
the Market Price for Notes exchanged in the event that a registration statement
covering the Target Common Stock deliverable upon exchange is not then effective
under the Securities Act or Target has elected to suspend exchange of Notes for
Target Common Stock.
 
     Additions to and Withdrawals from the Exchange Property.  Collagen will be
entitled to receive and retain all ordinary cash dividends paid out of retained
earnings on the shares of Target Common Stock deposited with the Exchange Agent.
All other distributions, if any, on Target Common Stock or other Exchange
Property deposited with the Exchange Agent shall become additional Exchange
Property. The additional Exchange Property will be apportioned pro rata among
the deposited shares of Target Common Stock, or, if there are no such shares,
among such other Exchange Property as shall have replaced such shares.
 
     If there is a taxable distribution on Exchange Property of any securities,
options, warrants or similar rights or other noncash items of property, Collagen
will instruct the Exchange Agent to sell all such distributed property for cash,
and the cash proceeds of such property after payment of taxes thereon, including
income taxes of Collagen, will be Exchange Property. If extraordinary cash
dividends are paid on securities constituting Exchange Property pursuant to a
plan of liquidation, partial liquidation, recapitalization or restructuring, or
if securities constituting Exchange Property are converted into cash pursuant to
a merger or tender offer, then such cash after payment of any taxes thereon,
including income taxes of Collagen, will be Exchange Property.
 
     If there is a nontaxable distribution on Exchange Property of any
securities or other noncash items of property (other than options, warrants or
similar rights as described in the following paragraph), Collagen in good faith
may, at its option, cause the sale of some or all of such property, and the cash
proceeds and/or the remainder of such property after payment of any taxes
thereon, including income taxes of Collagen, will be Exchange Property;
provided, that if Collagen has received a similar nontaxable distribution on
similar securities owned by Collagen not comprising Exchange Property, including
Target Common Stock, Collagen may not sell the distribution property
 
                                       69
<PAGE>   72
 
or the Exchange Property unless Collagen also sells the distribution property on
the similar securities owned by Collagen.
 
     If there is a nontaxable distribution on Exchange Property of any options,
warrants or similar rights, Collagen in good faith may, at its option, (a) cause
the sale of such options, warrants or similar rights and the cash proceeds after
payment of any taxes thereon, including income taxes of Collagen, will be
Exchange Property; (b) to the extent there is sufficient cash among the Exchange
Property or to the extent Collagen may cause the sale of Target Common Stock or
other Exchange Property to provide sufficient cash, after payment of taxes
thereon, among the Exchange Property, cause the exercise of such options,
warrants or similar rights and thereafter, either (i) retain the securities
received upon such exercise as Exchange Property, (ii) cause some or all of such
securities to be sold, in which case the cash proceeds and the remainder of such
property, if any, after payment of any taxes thereon, including income taxes of
Collagen, will be Exchange Property, or (iii) cause the pro rata distribution of
such securities to Noteholders; (c) retain such options, warrants or similar
rights as Exchange Property, provided that such options, warrants or similar
rights shall not be allowed to expire unexercised so long as they are in the
money and if otherwise feasible; or (d) cause the pro rata distribution of such
options, warrants or similar rights to Noteholders; provided, that if Collagen
has received a similar nontaxable distribution on similar securities owned by
Collagen not comprising Exchange Property, including Target Common Stock,
Collagen may not sell the distribution property or the Exchange Property unless
Collagen also sells the distribution property on the similar securities owned by
Collagen. Because any subsequent distribution to Noteholders of securities,
options, warrants or similar rights or other noncash items of property received
with respect to Exchange Property may give rise to tax liability for Collagen,
Collagen may be more likely to elect to cause the sale of such items (or, in the
case of options, warrants or similar rights, to cause the sale of the securities
received upon the exercise of such items) and to cause the cash proceeds (after
provision for taxes) to be treated as Exchange Property, in lieu of causing the
pro rata distribution of such items to the Noteholders.
 
     Upon the happening of any of the foregoing events with respect to the
Target Common Stock or other Exchange Property that is taxable or treated as
being taxable to Collagen or the Exchange Agent, the Exchange Agent will deliver
cash which it holds for exchange (including cash received as a result of such
event) to Collagen or to itself for payment of the taxes arising from such
transaction. If the cash held for exchange is insufficient to pay such taxes,
the Exchange Agent will sell such of the shares of Target Common Stock or other
Exchange Property as may be necessary to pay the amount of the insufficiency and
any taxes payable by Collagen or the Exchange Agent arising from such sale. Any
proceeds from such sale which remain after the above tax payments are made will
be Exchange Property. As a result of the payment of such taxes from the Exchange
Property, the net amount of Exchange Property received by a holder upon
exchanging Notes for such Exchange Property may be significantly less than the
amount of Exchange Property that would have been received by such holder (after
taking into account taxes imposed on the holder with respect to such exchange,
as described in "Certain United States Federal Income Tax
Consequences -- Exchange of Notes for Target Common Stock") had the holder
exercised the exchange right immediately prior to any such event.
 
     In the event of a proposed merger, consolidation or reorganization of
Target, the sale of all or substantially all of Target's assets, or certain
tender or exchange offers for Target Common Stock (a "Reorganization"), the
Noteholders shall have the option to conditionally exercise their right to
exchange all or any portion of their Notes for Exchange Property in advance of
the Reorganization subject to its completion and to withdraw such exchange and
retain their Notes within certain time periods set forth in the Exchange
Agreement in the event that such Reorganization is not effected.
 
     Merger or Consolidation of Target.  In the case of any merger or
consolidation of Target with or into any other entity which results in shares of
Target Common Stock being converted into other securities and/or property,
including cash, or any sale or transfer of all or substantially all the assets
of Target in which holders of Target Common Stock receive other securities
and/or property,
 
                                       70
<PAGE>   73
 
including cash, in exchange for their shares of Target Common Stock, Collagen
will execute and deliver to the Trustee a supplemental indenture, and to the
Exchange Agent a supplement to the Exchange Agreement, each providing that the
holder of any Note surrendered for exchange thereafter will, subject to
provision for taxes, be entitled to receive, in addition to other Exchange
Property, if any, the kind and amount of securities and/or property receivable
in connection with such transaction by a holder of the number of shares of
Target Common Stock for which such Note might have been exchanged immediately
prior to such transaction, plus accrued interest thereon, if any, to the date of
exchange.
 
     Tender or Exchange Offer.  In the event of a tender offer or exchange offer
for any class of securities included within the Exchange Property (a) if
Collagen owns other securities of such class which are not Exchange Property,
Collagen will cause the Exchange Agent to tender such securities of such class
in the same proportion that Collagen tenders its securities in such class which
are not Exchange Property, and (b) if the only securities of such class owned by
Collagen are Exchange Property, Collagen may, at its option and in its sole
discretion, elect to cause the Exchange Agent to tender all or any portion or
none of such class of security included within the Exchange Property. If,
however, the tender or exchange offer for securities included within the
Exchange Property is made by Collagen or any affiliate of Collagen, Collagen
will not cause the Exchange Agent to tender any such securities unless a
majority of such class of securities that are held by persons other than
Collagen or any affiliate of Collagen have been tendered and not withdrawn
pursuant to such tender or exchange offer as of immediately prior to the
expiration of such offer. The proceeds, after provision for taxes, of the sale
of any such Exchange Property pursuant to any such tender or exchange offer,
plus accrued interest thereon, if any, to the date of exchange, will be held by
the Exchange Agent for the benefit of Noteholders as provided in the Indenture.
A tender or exchange offer, whether made by Collagen, any affiliate of Collagen
or a third party, may result in shares of Target Common Stock or other Exchange
Property being replaced by cash or other property (which may or may not be
publicly traded equity securities).
 
     If any tender offer or exchange offer results in there being no shares of
Target Common Stock among the Exchange Property, Collagen will execute and
deliver to the Trustee a supplemental indenture, and to the Exchange Agent a
supplement to the Exchange Agreement, each providing that any Note surrendered
for exchange thereafter will, subject to provision for taxes, be entitled to
receive, in addition to other Exchange Property, if any, the kind and amount of
securities and/or property receivable upon or in connection with such tender or
exchange offer by a holder of the number of shares of Target Common Stock for
which such Note might have been exchanged immediately prior to such transaction.
 
     Certain Tax Withholding; Notices; and Investment of Exchange
Property.  From time to time, Collagen may require the Exchange Agent to
segregate such Exchange Property as Collagen determines may be necessary for
Collagen or the Exchange Agent to pay taxes with respect to the transactions or
events described above. The remaining Exchange Property will be deliverable to
holders of Notes only after determination that withholding is not necessary for
the payment of such taxes and after deducting the reasonable expenses incurred
in connection with such determination.
 
     Collagen is required to notify Noteholders of certain dividends or other
distributions on the Target Common Stock or other Exchange Property deliverable
upon exchange of Notes, the granting of subscription rights, options, warrants
or other similar rights to holders of Target Common Stock, any reclassification
of Target Common Stock, certain mergers involving Target, the sale of all or
substantially all of the assets of Target, any tender or exchange offer for the
Target Common Stock and the dissolution, liquidation or winding up of Target.
 
     Any cash held by the Exchange Agent that is deliverable as Exchange
Property upon exchange of Notes will be invested by the Exchange Agent at the
direction of Collagen in U.S. Government Obligations with maturity dates of
twelve months or less. Accrued interest, if any, on such investments shall
become the property of Collagen except for interest accruing on Exchange
 
                                       71
<PAGE>   74
 
Property received upon conversion or sale of Target Common Stock in connection
with a merger, consolidation, or reorganization of Target or a tender or
exchange offer for Target Common Stock.
 
OPTIONAL REDEMPTION BY COLLAGEN
 
     The Notes will not be redeemable at the option of Collagen prior to May 10,
1998. At any time on or after that date, the Notes may be redeemed at the option
of Collagen, in whole or from time to time in part, on not less than 30 nor more
than 60 days' notice by mail. The redemption prices (expressed as percentages of
the principal amount) (the "Redemption Price") are as follows for the 12-month
period beginning May 10 of the following years:
 
<TABLE>
<CAPTION>
                                                                       REDEMPTION
                                     YEAR                                PRICE
            -------------------------------------------------------    ----------
            <S>                                                        <C>
            1998...................................................           %
            1999...................................................           %
            2000...................................................           %
            2001...................................................           %
</TABLE>
 
and 100% at May 10, 2002, in each case together with accrued interest to the
redemption date. If fewer than all of the Notes are to be redeemed, the Trustee
will select the Notes to be redeemed by lot or, in its discretion, on a pro rata
basis. If any Note is to be redeemed in part only, a new Note or Notes in
principal amount equal to the unredeemed principal portion thereof will be
issued. There is no sinking fund applicable to the Notes.
 
REDEMPTION OF NOTES AT THE OPTION OF NOTEHOLDERS UPON A CHANGE IN CONTROL
 
     In the event of a Change in Control (as defined below), each Noteholder
will have the right, subject to the terms and conditions of the Indenture, to
require Collagen to purchase all or any part of the Notes held by such
Noteholder on the date that is 40 business days after the occurrence of such
Change in Control (the "Change in Control Purchase Date") for a purchase price
equal to 100% of the principal amount thereof, plus accrued interest to the
Change in Control Purchase Date (the "Change in Control Price").
 
     Within ten business days after the occurrence of the Change in Control,
Collagen will mail a written notice of the Change in Control to the Trustee and
to each Noteholder, setting forth, among other things, the terms, conditions,
and procedures required for exercise of the Noteholder's right to require the
purchase of the Notes held by such Noteholder.
 
     To exercise the purchase right, a Noteholder must deliver written notice of
exercise to the Exchange Agent at any time prior to the close of business on the
Change in Control Purchase Date, specifying the Notes with respect to which the
right of purchase is being exercised. Such notice of exercise may be withdrawn
by the Noteholder by a written notice of withdrawal delivered to the Exchange
Agent at any time prior to the close of business on the Change in Control
Purchase Date.
 
     A Change in Control shall be deemed to have occurred at such time after the
original issuance of the Notes as there shall occur:
 
          (i) the acquisition by any person (including any syndicate or group
     deemed to be a "person" under Section 13(d)(3) or 14(d)(2) of the Exchange
     Act, or any successor provision to either of the foregoing), of beneficial
     ownership, directly or indirectly, through a purchase, merger or other
     acquisition transaction or series of transactions, through proxies or
     otherwise, of shares of capital stock of Collagen entitling such person to
     exercise more than 50% of the total voting power of all shares of capital
     stock of Collagen entitled to vote generally in elections of directors; or
 
          (ii) any consolidation of Collagen with, or merger of Collagen into,
     any other person, any merger of another person into Collagen, or any sale
     or transfer of all or substantially all of the
 
                                       72
<PAGE>   75
 
     assets of Collagen to another person (other than a merger (x) which does
     not result in any reclassification, conversion, exchange or cancellation of
     outstanding shares of capital stock, or (y) which is effected solely to
     change the jurisdiction of incorporation of Collagen and results in a
     reclassification, conversion or exchange of outstanding shares of Collagen
     common stock into solely shares of common stock); or
 
          (iii) a change in the composition of the Board of Directors of
     Collagen such that a majority of such Board are not Continuing Directors
     (as hereinafter defined)
 
provided, however, that a Change in Control shall not be deemed to have occurred
if the average closing price of the Notes for each of any five trading days
within the period of ten consecutive trading days ending immediately after the
later of the Change in Control or the public announcement of the Change in
Control (in the case of a Change in Control under clauses (i) and (iii) above)
or ending immediately after the Change in Control (in the case of a Change in
Control under clause (ii) above) shall equal or exceed 105% of the principal
amount of the Notes, or (b) the rating assigned to the Notes by a nationally
recognized rating agency immediately after the public announcement of the Change
in Control remains equal to or better than the rating of the Notes assigned by
such agency immediately prior to the public announcement of the Change in
Control. A "beneficial owner" shall be determined in accordance with Rule 13d-3
promulgated by the Commission under the Exchange Act or any successor rule or
regulation. For purposes of the foregoing, a Change in Control shall not be
deemed to have occurred solely because any person receives revocable proxies
entitling such person to (i) exercise 50% or more of the total voting power of
all shares of capital stock of Collagen in an annual or special meeting of
stockholders or (ii) elect a majority of the members of Board of Directors of
Collagen.
 
     The Change in Control purchase right may in certain circumstances make more
difficult or discourage a takeover of Collagen and the removal of incumbent
management. Management of Collagen presently are unaware of any specific effort
to accumulate shares of capital stock or to obtain control of Collagen by means
of a merger, tender offer, proxy solicitation or otherwise. The Change in
Control purchase feature is customary in similar debt offerings and is the
result of negotiations between Collagen, Target and the Underwriter. The Change
in Control feature is not part of a plan by Collagen management to adopt a
series of anti-takeover provisions.
 
     In the event a Change in Control occurs and the Noteholders exercise their
rights to require Collagen to repurchase the Notes, Collagen intends to comply
with applicable tender offer rules under the Exchange Act, including Rules 13e-4
and 14e-1, as then in effect, with respect to any such repurchase.
 
     If a Change in Control were to occur, there can be no assurance that
Collagen then would have sufficient funds to pay the Change in Control Price for
all of the Notes tendered by holders thereof. Payment of the Change in Control
Price is subject to the subordination provisions set forth below, and,
accordingly, any repurchase of the Notes upon a Change in Control may be
blocked, deferred or limited by the holders of Senior Indebtedness.
 
     "Continuing Director" is defined in the Indenture as, of any date, a member
of the Board of Directors of Collagen who (a) was a member of the Board of
Directors of Collagen at the time of the initial issuance of the Notes, or (b)
was nominated or appointed to the Board of Directors of Collagen with the
affirmative vote of at least a majority of the directors who were Continuing
Directors at the time of such nomination or appointment.
 
SUBORDINATION OF NOTES
 
     Indebtedness evidenced by the Notes will be subordinated in right of
payment, as set forth in the Indenture, to the prior payment in full of all
existing and future Senior Indebtedness of Collagen. By reason of such
subordination, in the event of dissolution, insolvency, bankruptcy or other
similar proceedings, upon any distribution of assets, (a) the holders of Notes
will be required
 
                                       73
<PAGE>   76
 
to return their share of such distribution in respect of the Notes to the
holders of Senior Indebtedness until such Senior Indebtedness is paid in full
and (b) creditors of Collagen who are not holders of Notes may recover more,
ratably, than the holders of Notes.
 
     No payment of principal, premium, if any, or interest, including the
Redemption Price or the Change in Control Price, on the Notes may be made if any
default with respect to any Designated Senior Indebtedness occurs and is
continuing that permits the acceleration of the maturity thereof and, in the
case of a default other than a default in the payment of principal, premium, if
any, or interest on any Designated Senior Indebtedness, Collagen receives
written notice of such default. Notwithstanding the foregoing, Collagen is
required to (a) honor a Noteholder's right to exchange the Note for Target
Common Stock or other Exchange Property at any time without regard to any such
default, and (b) resume payments of principal, premium, if any, and interest on
the Notes, including the Redemption Price and the Change of Control Price, if
(i) (x) 179 days (the "Blockage Period") pass after notice of the default is
given, (y) and such default is not then the subject of judicial proceedings or
such Designated Senior Indebtedness has not been accelerated in accordance with
its terms, and (z) such default is not a default in the payment of principal,
premium, if any, or interest on any Designated Senior Indebtedness, or (ii) the
default with respect to the Designated Senior Indebtedness is cured or waived,
and, in the case of (a) and (b) above, the terms of the Indenture otherwise
permit the payment, conversion or redemption of the Notes at that time.
Successive Blockage Periods based on successive defaults, other than payment
defaults, may be commenced, provided, that no default, other than a payment
default, which existed or was continuing on the date of the commencement of any
Blockage Period may be the basis for the commencement of any other Blockage
Period with respect to such Designated Senior Indebtedness unless such event of
default has been cured or waived for a period of not less than 90 consecutive
days.
 
     The delivery of Target Common Stock and other Exchange Property upon
exchange of a note will constitute payment on a Note and therefore will be
subject to the subordination provisions in the Indenture, as described above.
The subordination provisions will not prevent the occurrence of an Event of
Default under the Indenture or impair, as between Collagen, the Noteholders, and
the holders of other indebtedness, other than Senior Indebtedness, the
obligations of Collagen to make payments on the Notes when due.
 
     The Notes will be obligations exclusively of Collagen and not of Target. In
addition, the Notes will be effectively subordinated to all liabilities,
including trade payables, of Collagen's subsidiaries. Any right of Collagen to
receive assets of any of its subsidiaries upon their liquidation or
reorganization (and the consequent right of the holders of the Notes to
participate in those assets) will be effectively subordinated to the claims of
that subsidiary's creditors, including trade creditors, except to the extent
that Collagen is itself recognized as a creditor of such subsidiary, in which
case the claims of Collagen would still be subordinate to any security interest
in the assets of such subsidiary and any indebtedness of such subsidiary senior
to that held by Collagen.
 
     As of February 28, 1995, there was no outstanding Senior Indebtedness of
Collagen and $2.5 million of outstanding indebtedness of Collagen's
subsidiaries. There is no restriction in the Indenture on the creation of
additional indebtedness by Collagen or its subsidiaries, including Senior
Indebtedness.
 
     "Designated Senior Indebtedness" is defined in the Indenture as any Senior
Indebtedness with an aggregate principal amount in excess of $3 million and
which is designated in its governing instrument as Designated Senior
Indebtedness.
 
     "Indebtedness" means with respect to any person at any date, without
duplication, (a) all obligations of such person for borrowed money (including,
without limitation, indebtedness secured by a mortgage or other lien which is
(i) given to secure all or part of the purchase price of property subject
thereto, whether given to the vendor of such property or to another, or (ii)
existing on property at the time of acquisition thereof), (b) all obligations of
such person evidenced by
 
                                       74
<PAGE>   77
 
bonds, debentures, notes or other similar instruments and all indebtedness
consisting of reimbursement obligations due and owing with respect to letters of
credit, (c) all Indebtedness of others secured by a lien on any asset of such
person, whether or not such Indebtedness is assumed by such person, (d) all
obligations of such person pursuant to capitalized leases, (e) all Indebtedness
of others for the payment of which such person is responsible or liable as
obligor or guarantor, (f) commitment or standby fees due and payable to lending
institutions with respect to available credit facilities; and (g) all
obligations of such person for interest rate and currency swaps, floors,
collars, caps and similar arrangements.
 
     "Senior Indebtedness" is defined in the Indenture as the principal,
premium, if any, and interest on (including interest accruing after the filing
of any petition initiating any proceeding pursuant to any bankruptcy) and other
amounts due (including, without limitation, fees, costs, enforcement expenses,
collateral protection expenses and other reimbursement or indemnity obligations
in respect of Senior Indebtedness) on or in connection with any Indebtedness
incurred, assumed or guaranteed by Collagen, whether outstanding on the date of
the Indenture or thereafter incurred, assumed or guaranteed, and all renewals,
extensions, restructurings, amendments, modifications and refundings of any such
Indebtedness. Excluded from the definition of Senior Indebtedness are the
following: (a) any Indebtedness which expressly provides (i) that such
Indebtedness shall not be senior in right of payment to the Notes, or (ii) that
such Indebtedness shall be subordinated to any other Indebtedness of Collagen,
unless such Indebtedness expressly provides that such Indebtedness also shall be
senior in right of payment of the Notes, and (b) any Indebtedness of Collagen to
any affiliate or subsidiary of Collagen.
 
EVENTS OF DEFAULT AND REMEDIES
 
     If an Event of Default (other than an Event of Default resulting from
bankruptcy, insolvency or reorganization) occurs and is continuing, the Trustee
may, by notice to Collagen, or the Noteholders of at least 25% in aggregate
principal amount of the Notes then outstanding may, by notice to Collagen and
the Trustee, declare all unpaid principal of and accrued interest to the date of
acceleration on the Notes then outstanding to be immediately due and payable. If
an Event of Default resulting from certain events of bankruptcy, insolvency or
reorganization shall occur, all unpaid principal of and accrued interest on the
Notes then outstanding shall immediately be due and payable without any
declaration or other act on the part of the Trustee or any Noteholders. Such
acceleration and its consequences may be rescinded or waived by the Noteholders
of a majority in aggregate principal amount of the Notes then outstanding,
subject to the conditions provided in the Indenture.
 
     The term "Event of Default" when used in the Indenture means any of the
following: (a) a default in payment of the principal or premium, if any, on the
Notes when due, including the Redemption Price or the Change in Control Price;
(b) a default for 30 days in payment of any installment of interest on the
Notes; (c) failure by Collagen to deliver Target Common Stock or other Exchange
Property upon exchange of the Notes (an "Exchange Default"); (d) default by
Collagen or any of its subsidiaries with respect to an obligation to pay
principal or interest on any other Indebtedness which results in acceleration of
Indebtedness representing in the aggregate more than $5 million; (e) default by
Collagen for 30 days after notice in the performance of any other covenants
contained in the Indenture; and (f) certain events involving bankruptcy,
insolvency or reorganization of Collagen.
 
     The Indenture will provide that the Trustee will give notice of any default
to the Noteholders within sixty days of notice of its occurrence; provided that,
except for a default in the payment of principal, premium, if any, or interest
on any of the Notes, including the Redemption Price, the Change in Control Price
or upon an Exchange Default, the Trustee shall be protected in withholding of
such notice if it in good faith determines that the withholding of such notice
is in the best interest of the Noteholders.
 
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<PAGE>   78
 
     The Indenture will provide that no Noteholder may pursue any remedy,
including without limitation, failure to pay the Change in Control Price when
due, under the Indenture against Collagen, except for a default in the payment
of principal, premium, if any, or interest on any of the Notes, including the
Redemption Price, or upon an Exchange Default, unless the Noteholder gives to
the Trustee written notice of a continuing Event of Default, the Noteholders of
at least 25% in principal amount of the outstanding Notes make a written request
to the Trustee to pursue the remedy, such Noteholders offer to the Trustee
indemnity satisfactory to the Trustee against any loss, liability or expense,
the Trustee does not comply with the request within 60 days after receipt of the
request and the offer of indemnity, and the Trustee shall not have received a
contrary direction from the Noteholders of a majority in principal amount of the
outstanding Notes.
 
AMENDMENT AND WAIVER
 
     Amendment or supplement of the Indenture or the Notes may be made by
Collagen and the Trustee without notice to any Noteholder but with the consent
of the Noteholders of a majority in aggregate principal amount of the then
outstanding Notes.
 
     The Noteholders of a majority in principal amount of the Notes then
outstanding may waive compliance in a particular instance by Collagen with any
provision of the Indenture or the Notes without notice to any Noteholder.
Without the consent of each Noteholder affected thereby, no amendment,
supplement or waiver may (a) reduce the amount of Notes held by Noteholders who
must consent to an amendment, supplement or waiver; (b) reduce the rate of or
change the time for payment of interest on any Note; (c) reduce the principal of
or premium on or change the fixed maturity of any Note or alter the redemption
provisions with respect thereto (other than the purchase of the Notes upon a
Change of Control); (d) alter the exchange provisions or the Exchange Property
with respect to any Note in a manner adverse to the Noteholder thereof; (e)
waive a default in the payment of the principal of or premium or interest on any
Note; (f) make any changes which could alter the rights of Noteholders of Notes
to waive defaults, to waive events of default, or to receive payment of the
Notes; (g) modify the subordination provisions of the Indenture in a manner
adverse to the Noteholders; or (h) make any Note payable in money other than
that stated in the Note. Noteholders of not less than a majority in aggregate
principal amount of then outstanding Notes may waive certain past defaults.
 
     Collagen and the Trustee may amend or supplement the Indenture or the Notes
without notice to or consent of any Noteholder of the outstanding Notes in
certain events, such as to comply with the liquidation and merger provisions
described in the Indenture, to provide for uncertificated Notes in addition to
or in place of certificated Notes, to cure any ambiguity, defect or
inconsistency or to make any other change that does not adversely affect the
rights of the Noteholders, or to comply with the provisions of the Trust
Indenture Act of 1939, as amended.
 
SATISFACTION AND DISCHARGE
 
     The Indenture will be discharged and canceled upon payment of all of the
Notes upon maturity, conversion or redemption. Collagen may terminate all of its
obligations under the Indenture, other than its obligation to pay the principal
of and interest on the Notes and certain other obligations (including its
obligation to deliver shares of Target Common Stock or Exchange Property upon
conversion of the Notes), at any time, by depositing with the Trustee or a
paying agent other than Collagen or Target, money or non-callable U.S.
Government Obligations sufficient to pay all remaining indebtedness on the
Notes.
 
TRUSTEE AND EXCHANGE AGENT
 
     The First National Bank of Boston will be the Trustee under the Indenture
and the Exchange Agent under the Exchange Agreement.
 
GOVERNING LAW
 
     The Indenture and the Notes will be governed by and construed in accordance
with the laws of the State of New York, without giving effect to such State's
conflict of laws principles.
 
                                       76
<PAGE>   79
 
             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
     The following summary is a general discussion of certain United States
federal income tax consequences of acquiring, holding and disposing of the
Notes, including the exchange of the Notes for Target Common Stock, and of
acquiring, holding and disposing of Target Common Stock received in such
exchange. The summary is based upon laws, regulations, rulings and decisions now
in effect, all of which are subject to change. This summary does not discuss all
aspects of federal income taxation that may be relevant to a particular investor
in light of the investor's personal investment circumstances and does not
discuss any aspects of state, local, foreign or federal estate and gift tax laws
that may be applicable to the Notes, to Target Common Stock or to the holders
thereof. The summary also does not discuss federal income tax consequences for
subsequent purchasers of Notes. This discussion is limited to persons who hold
Notes and Target Common Stock as "capital assets" (generally, property held for
investment) within the meaning of section 1221 of the Internal Revenue Code of
1986, as amended (the "Code"), and does not cover special rules applicable to
taxpayers who may fall into special classes, such as financial institutions,
insurance companies, mutual funds, dealers in securities, persons holding the
Notes as a position in a straddle or other integrated investment, S
corporations, trusts, individual retirement accounts and tax-exempt
organizations. This discussion also does not deal with circumstances where all
or a portion of the Exchange Property is other than Target Common Stock.
Accordingly, prospective investors should consult their own tax advisors with
respect to the application of federal, state, local and foreign tax laws to them
in light of their particular circumstances concerning the matters discussed
below.
 
     Investors should particularly note that the federal income tax treatment of
exchangeable debt instruments like the Notes is uncertain in a number of
significant respects. In addition, the treatment of such instruments under the
Code and proposed and final Treasury Regulations has been the subject of
frequent changes in the past and could be subject to further changes in the
future. Therefore, prospective investors are also urged to consult their tax
advisors with respect to possible future clarifications and changes in the
applicable rules governing such instruments.
 
INTEREST AND ORIGINAL ISSUE DISCOUNT
 
     Stated Interest.  Stated interest on the Notes will generally be includable
in and taxable as ordinary income in accordance with the holder's method of
accounting.
 
     Original Issue Discount.  Under final Treasury Regulations relating to
original issue discount (the "OID Regulations") and the terms of the Indenture,
each Note will generally be treated for federal income tax purposes as an
investment unit consisting of two distinct assets: (i) a debt instrument (the
"Debt Component") with a fixed principal amount payable at maturity of the Note
and bearing interest at the stated interest rate, and (ii) an option component
(the "Option Component") entitling the holder to exchange the Note for the
Exchange Property on the terms described herein. The OID Regulations generally
require that each holder allocate the purchase price of the Note between the
Debt Component and the Option Component based on their relative fair market
values. Collagen has determined that $          of each $1,000 face amount of
Notes will be allocated to the Option Component and the remainder to the Debt
Component. For federal income tax purposes, the difference between the portion
of the purchase price allocated to the Debt Component and the principal amount
of the Note payable at maturity constitutes OID, which holders will be required
to include as ordinary income as it accrues over the term of the Note, in
accordance with a constant yield to maturity method (in addition to the stated
interest on the Note), prior to receipt of payments attributable to such income
through exchange, redemption, other disposition or maturity of the Note.
Collagen's allocation of the purchase price between the Debt Component and
Option Component is based on its determination of the relative fair market
values of those two components. However, there can be no assurance that the
Internal Revenue Service ("IRS") will not challenge that allocation, in which
case Noteholders could recognize more or less OID than determined by Collagen.
 
                                       77
<PAGE>   80
 
     Tax Basis of Notes.  A holder's federal income tax basis with respect to
the Debt Component and the Option Component of a Note will initially equal the
portion of the purchase price of the Note allocated to each such component as
described in the preceding section. The holder's tax basis with respect to the
Debt Component will thereafter increase by the amount of OID required to be
included in the holder's income.
 
DISPOSITION OF NOTES
 
     The redemption by Collagen of a Note (including the exercise of its option
to pay cash in lieu of Target Common Stock or other Exchange Property to an
exchanging Noteholder) or the sale or exchange by a holder of a Note to a party
other than Collagen, will generally result in taxable gain or loss to a holder
equal to the difference between the amount of cash and fair market value of
other property received and the holder's tax basis. It appears a holder will be
required to calculate such gain or loss separately for the Debt Component and
the Option Component of the Note. In making such calculation, the cash and fair
market value of other property received should be allocated between the Debt
Component and the Option Component in accordance with their relative fair market
values on the date of such disposition. Such gain or loss will generally be
capital gain or loss (other than to the extent the amount realized is
attributable to accrued interest) and will be long-term capital gain or loss if
the holding period exceeds one year.
 
EXCHANGE OF NOTES FOR TARGET COMMON STOCK
 
     If a holder exercises the right to exchange a Note for Target Common Stock,
such exchange will be treated as a taxable disposition in which the holder will
be required to recognize taxable gain (or loss). In determining the amount of
such gain or loss, it is likely (based on the bifurcation approach under the OID
Regulations) that a holder will be treated as disposing of the Debt Component of
the Note in a taxable transaction for an amount equal to its then fair market
value and as exercising the Option Component of the Note in a non-taxable
transaction for an exercise price equal to the Debt Component's then fair market
value. In such event, a holder would recognize gain (or loss) on the disposition
of the Debt Component equal to the amount by which the fair market value of such
Debt Component exceeded (or was less than) the tax basis of the Debt Component
determined as described above. The receipt of Target Common Stock upon exercise
of the Option Component would, in such event, be non-taxable to the extent
Target Common Stock was received but would result in recognition of gain with
respect to the Option Component to the extent the holder received cash rather
than Target Common Stock. However, it is possible that a holder could instead
recognize gain (or loss) on the exercise of the exchange right equal to the
difference between the fair market value of the Target Common Stock and the
holder's overall tax basis in the Note. Any gain or loss on the exchange
generally will be long-term capital gain or loss if the Note has been held for
more than one year.
 
     If the first of the two characterizations set forth in the preceding
paragraph applies, then the holder's tax basis for the Target Common Stock
received in the exchange would equal the sum of the tax basis of the Option
Component and the fair market value of the Debt Component surrendered in the
exchange. If instead the second characterization applies, then the tax basis of
the Target Common Stock would equal its fair market value at the time of the
exchange. The holder's holding period for the Target Common Stock would not
include any portion of the holding period for the Note.
 
ADJUSTMENT OF EXCHANGE RATE AND MODIFICATION OF EXCHANGE PROPERTY
 
     Holders of Notes may be deemed to have received constructive distributions
where the exchange rate is adjusted to reflect property distributions with
respect to Target Common Stock into which such Notes are exchangeable.
Adjustments to the exchange rate made pursuant to a bona fide reasonable
adjustment formula which has the effect of preventing the dilution of the
interest of the holders of the Notes, however, will generally not be considered
to result in a constructive
 
                                       78
<PAGE>   81
 
distribution of Target Common Stock. Certain adjustments provided in the Notes
may not qualify as being pursuant to a bona fide reasonable adjustment formula.
If such adjustments were made, the holders of Notes could be deemed to have
received constructive distributions taxable as dividends to the extent of Target
earnings and profits. See "-- Distributions on Target Common Stock." In
addition, distributions with respect to Exchange Property of any securities,
options, warrants, similar rights or other noncash items of property could be
viewed as equivalent to exchange rate adjustments giving rise to constructive
distributions to holders of Notes.
 
     Further, under proposed Treasury Department Regulations, some of the
possible changes in the Exchange Property could be treated as causing a
"significant modification" of the Notes. Any such modification could be treated
as a taxable exchange of the Option Component for the modified Option Component,
giving rise to gain or loss for a holder equal to the difference between the
fair market value of the modified Option Component and the holder's adjusted
basis in the original Option Component. Alternatively, if the bifurcation
treatment under the OID Regulations does not apply in this context, a holder
would recognize gain or loss equal to the difference between the fair market
value of the modified Note and the holder's adjusted basis in the original Note.
 
DISTRIBUTIONS ON TARGET COMMON STOCK
 
     Distributions with respect to shares of Target Common Stock that are
received in exchange for Notes will be treated as dividends for federal income
tax purposes and will be taxed as ordinary income to the extent of Target's
earnings and profits for such purposes. Certain corporations may qualify for a
70% dividends received deduction (80% for certain corporate stockholders owning
at least 20%, by vote and value, of Target's stock) if various conditions are
met.
 
     Distributions will constitute dividends taxable as ordinary income to the
extent Target has either (a) current earnings and profits determined at the end
of the taxable year in which the distribution is made or (b) accumulated
earnings or profits determined at the time the distribution is made. To the
extent that the entire distribution is greater than the amount of earnings and
profits determined above, the excess will be treated as a nontaxable return of
capital which will reduce the recipient's basis for the Target Common Stock. To
the extent that a recipient receives aggregate distributions that are not out of
current or accumulated earnings and profits and such distributions exceed the
tax basis of the Target Common Stock, the excess will be taxed as a gain from
the sale or exchange of the Target Common Stock. See "-- Dispositions of Target
Common Stock."
 
DISPOSITIONS OF TARGET COMMON STOCK
 
     Generally, any sale or other disposition of Target Common Stock will be a
taxable event and will result in capital gain or loss if the Target Common Stock
is held as a capital asset. The amount of such gain or loss will generally be
the difference between the federal income tax basis of the Target Common Stock
on the date of the sale or other disposition and the cash and fair market value
of property received. Such gain or loss will be long-term capital gain or loss
if the Target Common Stock is held for more than one year.
 
BACKUP WITHHOLDING
 
     Under the backup withholding provisions of the Code and applicable Treasury
Department regulations, a holder of Notes or Target Common Stock may be subject
to backup withholding at the rate of 31% with respect to interest on and OID
with respect to Notes, dividends on Target Common Stock and the gross proceeds
of a sale, exchange, retirement or redemption of Notes or Target Common Stock.
However, backup withholding generally will not be required if such holder (a) is
a corporation or comes within certain other exempt categories and when required
demonstrates this fact or (b) provides a taxpayer identification number,
certifies as to no loss of exemption from backup withholding, and otherwise
complies with applicable requirements of the backup withholding rules. The
amount of any backup withholding from a payment to a holder will be allowed as a
 
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<PAGE>   82
 
credit against the holder's federal income tax liability and may entitle such
holder to a refund, provided that the required information is furnished to the
IRS.
 
     Collagen or Target will cause to be reported to the holders of Notes or
Target Common Stock and the IRS for each calendar year the amount of interest or
dividends paid and OID accrued during such year, and the amount of tax withheld,
if any, with respect to the same.
 
FOREIGN HOLDERS
 
     Interest and OID on Notes held by persons who are Non-United States Holders
will generally be exempt from United States federal income tax and/or
withholding tax, provided that the Non-United States Holder does not actually or
constructively own 10% or more of the total combined voting power of all classes
of Collagen capital stock entitled to vote or certain other exceptions to
exemption from such tax apply. A Non-United States Holder is a holder who is
not, for United States federal income tax purposes, (i) a citizen or resident of
the United States, (ii) a corporation, partnership or other entity created or
organized in or under the laws of the United States or any political subdivision
thereof, or (iii) an estate or trust the income of which is subject to United
States federal income taxation regardless of source.
 
     For a Non-United States Holder to obtain such exemption, the Code requires
the beneficial owner to submit a statement that such owner is not a United
States person, which statement must be filed with the person who would otherwise
be responsible for withholding such tax. Temporary Treasury Department
Regulations require that statement to be signed by the beneficial owner under
penalties of perjury and to provide such owner's address. Interest and OID on
the Notes may be subject to United States federal income tax (and branch profits
tax for foreign corporate holders) if they are effectively connected with the
conduct of a trade or business within the United States. There are also special
rules for controlled foreign corporations, certain other types of foreign
stockholders and foreign partnerships, estates and trusts.
 
     In general, dividends paid on shares of Target Common Stock held by a
Non-United States Holder will be subject to withholding tax at a rate of 30% but
will not be subject to backup withholding. The withholding rate may be lower
under an applicable tax treaty. A Non-United States Holder generally will not be
subject to United States federal income tax on any gain realized in connection
with a disposition or retirement of Notes (including the exchange of a Note for
Target Common Stock) or Target Common Stock unless (i) the gain is effectively
connected with a trade or business carried on by the Non-United States Holder
within the United States, or, if a treaty applies, generally attributable to a
United States permanent establishment maintained by the Non-United States
Holder, or (ii) the Non-United States Holder is an individual who is present in
the United States for 183 days or more in the taxable year of disposition and
has a tax home or an office or other fixed place of business to which the gain
is attributable in the United States.
 
     Prospective Non-United States Holders should consult their tax advisors as
to the scope of and procedural requirements under any treaties and with regard
to the exemption from United States federal income tax for interest and OID on
the Notes and the special backup withholding rules and provisions regarding gain
from the sale, exchange, redemption or other disposition of Notes or Target
Common Stock applicable to such purchasers.
 
                                       80
<PAGE>   83
 
                      DESCRIPTION OF TARGET CAPITAL STOCK
 
     The authorized capital stock of Target consists of 25,000,000 shares of
Common Stock, $0.0025 par value per share, and 2,000,000 shares of Preferred
Stock, $0.001 par value per share.
 
COMMON STOCK
 
     The holders of Common Stock are entitled to one vote per share on all
matters to be voted upon by the stockholders, except that, upon giving the
legally required notice, stockholders may cumulate their votes in the election
of directors. Subject to preferences that may be applicable to any outstanding
Preferred Stock, the holders of Target Common Stock are entitled to receive
ratably such dividends, if any, as may be declared from time to time by the
Board of Directors out of funds legally available therefor. See "Price Range of
Target Common Stock and Dividend Policy." In the event of a liquidation,
dissolution or winding up of Target, the holders of Target Common Stock are
entitled to share ratably in all assets remaining after payment of liabilities,
subject to prior rights of Preferred Stock, if any, then outstanding. The Target
Common Stock has no preemptive or conversion rights or other subscription
rights. There are no redemption or sinking fund provisions available to the
Target Common Stock. All outstanding shares of Target Common Stock are fully
paid and non-assessable.
 
     At December 31, 1994, 7,067,562 shares of Target Common Stock were
outstanding and held by approximately 150 holders of record, and stock options
for an aggregate of 628,629 shares of Target Common Stock were also outstanding.
 
PREFERRED STOCK
 
     Target is authorized to issue 2,000,000 shares of Preferred Stock, of which
50,000 shares have been designated as Series A Participating Preferred Stock
(see "-- Preferred Share Purchase Rights"), and none of which is issued and
outstanding. The Board of Directors has the authority to issue the undesignated
Preferred Stock in one or more series and to fix the rights, preferences,
privileges and restrictions granted to or imposed upon any wholly unissued
shares of undesignated Preferred Stock and to fix the number of shares
constituting any series and the designation of such series, without any further
vote or action by the stockholders. The issuance of Preferred Stock may have the
effect of delaying, deferring or preventing a change in control of Target
without further action by the stockholders and may adversely affect the voting
and other rights of the holders of Target Common Stock. At present, Target has
no plans to issue any shares of Preferred Stock.
 
PREFERRED SHARE PURCHASE RIGHTS
 
     Each share of Target Common Stock has associated with it one Preferred
Share Purchase Right (a "Right"). The Rights trade automatically with shares of
Target Common Stock and may not be exercised or traded separately until certain
events occur, including if a person or group acquires beneficial ownership of
15% or more of Target's Common Stock (or, in the case of Collagen, acquires
shares of Target Common Stock that would increase its holdings above their
September 21, 1994 level, unless approved by Target's Board of Directors or a
committee thereof); or announces a tender or exchange offer, the consummation of
which would result in ownership by a person or group of 15% or more of Target's
Common Stock. After becoming exercisable, each Right will entitle the holder to
purchase, for $135.00, a fraction of a share of Target's Series A Participating
Preferred Stock with economic terms similar to that of one share of Target's
Common Stock. In addition, after any person (an "Acquiring Person") acquires 15%
or more of Target's Common Stock (other than pursuant to a tender offer deemed
fair by the Board of Directors (a "Permitted Offer")) (or, in the case of
Collagen, acquires shares of Target Common Stock that would increase its
holdings above their September 21, 1994 level, unless approved by Target's Board
of Directors or a committee thereof), then each Right (other than Rights owned
by an Acquiring Person or its affiliates) will entitle the holder thereof to
purchase, for the exercise price, a number of shares of Target's Common Stock
having a then current market value of twice the exercise price. If, after such
date,
 
                                       81
<PAGE>   84
 
Target merges into another entity, an acquiring entity merges into Target, or
(c) Target sells more than 50% of its assets or earning power, then each Right
(other than Rights owned by an Acquiring Person or its affiliates) will entitle
the holder thereof to purchase, for the exercise price, a number of shares of
Target Common Stock of the person engaging in the transaction having a then
current market value of twice the exercise price (unless the transaction
satisfies certain conditions and is consummated with a person who acquired
shares pursuant to a Permitted Offer, in which case the Rights will expire).
 
     The Rights are redeemable at Target's option for $0.01 per Right at any
time on or prior to the tenth day (or such later date as may be determined by a
majority of Target's directors who are not affiliated with an Acquiring Person)
after any person becomes an Acquiring Person. At any time after a person becomes
an Acquiring Person and prior to the acquisition by the Acquiring Person of 50%
or more of the outstanding Target Common Stock, Target's Board of Directors may
exchange the Rights (other than Rights owned by the Acquiring Person or its
affiliates), in whole or in part, at an exchange ratio of one share of Target
Common Stock per Right (subject to adjustment). The Rights will expire, if not
earlier exchanged or redeemed, on September 21, 2004.
 
DELAWARE LAW
 
     Target is subject to the provisions of Section 203 of the Delaware General
Corporation Law. In general, the statute prohibits a publicly held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years after the date that the person became
an interested stockholder unless (with certain exceptions) the business
combination or the transaction in which the person became an interested
stockholder is approved in a prescribed manner. Generally, a "business
combination" includes a merger, asset or stock sale, or other transaction
resulting in a financial benefit to the stockholder, and an "interested
stockholder" is a person who, together with affiliates and associates, owns (or
within three years prior, did own) 15% or more of the corporation's outstanding
voting stock. This provision may have the effect of delaying, deferring or
preventing a change in control of Target without further action by the
stockholders. However, this provision will not restrict transactions between
Target and Collagen, which became an interested stockholder more than three
years ago. See "Beneficial Ownership of Target Common Stock By Collagen and
Certain Other Relationships."
 
TRANSFER AGENT AND REGISTRAR
 
     The Transfer Agent and Registrar for Target's Common Stock is The First
National Bank of Boston, Boston, Massachusetts.
 
                                       82
<PAGE>   85
 
                  BENEFICIAL OWNERSHIP OF TARGET COMMON STOCK
                  BY COLLAGEN AND CERTAIN OTHER RELATIONSHIPS
 
     As of March 15, 1995, Collagen owned 2,124,194 shares of Target Common
Stock, representing approximately 30% of the outstanding shares of Target Common
Stock. Prior to any exchange of Notes for Target Common Stock, Collagen will
continue to own the shares of Common Stock issuable upon exchange of the Notes,
and will continue to exercise all rights, including voting rights, incident to
such ownership. Accordingly, Collagen may have sufficient voting power to
significantly influence the outcome of matters submitted to Target's
stockholders for approval. As a result, Collagen may have the power to influence
any potential proxy contest, merger, tender offer, open-market repurchase
program or other purchases of Target Common Stock that could result in a change
of the composition of the Exchange Property or give the holders of Target Common
Stock the opportunity to realize a premium over the then prevailing market price
for shares of Target Common Stock. In addition, two members of Target's Board of
Directors, Howard D. Palefsky and William G. Davis, are also directors of
Collagen, and Mr. Palefsky also is an officer of Collagen, and Collagen thereby
may be able to exercise additional control over Target's affairs. Collagen has
in the past sold and expects to continue to sell shares of Target Common Stock
in the open market or otherwise, subject to the limitations of Rule 144 and
Collagen's agreement with the Underwriter to refrain from sales of Target Common
Stock for a period of 90 days after the date of this Prospectus. See
"Underwriting." Such sales may have the effect of depressing the trading price
of Target's Common Stock.
 
     Collagen and Target have also entered into a Stockholder Agreement (the
"Stockholder Agreement") providing that all transactions between Target and
Collagen or any affiliate of Collagen must be approved by a special committee of
Target's Board of Directors comprised of three directors who are not officers,
directors, employees or affiliates of Collagen. The members of this committee
currently are Richard D. Randall and Charles M. Strother, M.D., with one
vacancy. During the effective term of the Stockholder Agreement, Collagen may
not vote to eliminate from the Company's Certificate of Incorporation provisions
requiring cumulative voting for the election of directors. In addition, the
Stockholder Agreement provides that Collagen will not sell any of its Target
Common Stock at a premium over the average market price over the three day
period preceding such sale, except for premiums which may be simultaneously
received by all of Target's stockholders in the event of a tender offer, merger
or reorganization. With respect to the offering made hereby, Target and Collagen
have agreed that the shares offered by Collagen upon exchange of Notes may be
sold on the terms and conditions described in this Prospectus. The Stockholder
Agreement requires that affiliates of Collagen purchasing Target Common Stock
from Collagen agree to the foregoing restrictions. The provisions of the
Stockholders Agreement became effective upon the consummation of the Company's
initial public offering in January 1992 and terminate on the earlier of seven
years from the date of the Stockholder Agreement or on the date Collagen
beneficially owns less than 5% of Target's Common Stock.
 
     Collagen and Target have entered into an agreement which provides that
Collagen will pay all fees and expenses directly related to the offering
contemplated hereby, including those of Target. Collagen and Target also have
agreed that they will indemnify each other for any losses suffered by the other
as a result of any material misstatements or omissions by the indemnifying party
in this Prospectus or the Registration Statement of which this Prospectus is a
part.
 
                                       83
<PAGE>   86
 
                                  UNDERWRITING
 
     Subject to the terms and the conditions of the Underwriting Agreement,
Alex. Brown & Sons Incorporated (the "Underwriter") has agreed to purchase from
Collagen $40,000,000 in principal amount of Notes at the public offering price
less the underwriting discounts and commissions set forth on the cover page of
this Prospectus.
 
     The Underwriting Agreement provides that the obligations of the Underwriter
are subject to certain conditions precedent and that the Underwriter will
purchase all of the Notes offered hereby if any such Notes are purchased.
 
     Collagen has been advised by the Underwriter that the Underwriter proposes
to offer the Notes to the public at the offering price to the public set forth
on the cover page of this Prospectus and to certain dealers at such price less a
concession not in excess of $          per Note. The Underwriter may allow, and
such dealers may reallow, a concession not in excess of $          per Note to
certain other dealers. After the offering contemplated hereby, the offering
price and other selling terms may be changed by the Underwriter.
 
     Collagen has granted to the Underwriter an option, exercisable not later
than 30 days after the date of this Prospectus, to purchase up to an additional
$5,000,000 principal amount of Notes at the offering price less the underwriting
discounts and commissions set forth on the cover page of this Prospectus. The
Underwriter may exercise such option only to cover over-allotments made in
connection with the sale of the Notes offered hereby. If purchased, the
Underwriter will offer such additional Notes on the same terms as those on which
the $40,000,000 in principal amount of Notes are being offered.
 
     Collagen and Target have agreed to indemnify the Underwriter against
certain liabilities, including liabilities under the Securities Act.
 
     Collagen, Target and executive officers and directors of Collagen and
Target have agreed subject to certain limited exceptions not to offer to sell,
contract to sell, or otherwise sell or dispose of any shares of Target Common
Stock, any options or warrants to purchase any shares of Target Common Stock, or
any securities convertible into or exchangeable for shares of Target Common
Stock for a period of 90 days after the date of this Prospectus without the
prior written consent of the Underwriter.
 
     In connection with this offering, the Underwriter and selling group members
(if any) who are qualifying registered market makers on the Nasdaq Stock Market
may engage in passive market making transactions in the Target Common Stock on
the Nasdaq National Market in accordance with Rule 10b-6A under the Exchange Act
during the two business day period before commencement of sales in this
offering. The passive market making transactions must comply with applicable
price and volume limits and be identified as such. In general, a passive market
maker may display its bid at a price not in excess of the highest independent
bid for the security, if all independent bids are lowered below the passive
market maker's bid, however, such bid must then be lowered when certain purchase
limits are exceeded. Net purchases by a passive market maker on each day are
generally limited to a specified percentage of the passive market maker's
average daily trading volume in the Target Common Stock during a prior period
and must be discontinued when such limit is reached. Passive market making may
stabilize the market price of the Target Common Stock at a level above that
which might otherwise prevail, and, if commenced, may be discontinued at any
time.
 
                                       84
<PAGE>   87
 
                                 LEGAL MATTERS
 
     The validity of the securities offered hereby will be passed upon by
Venture Law Group, A Professional Corporation, Menlo Park, California, counsel
for Collagen and Target. Venture Law Group will rely as to certain matters of
New York law on the opinion of Morrison & Foerster, New York, New York. Cooley
Godward Castro Huddleson & Tatum, Palo Alto, California, are acting as counsel
for the Underwriter in connection with certain legal matters relating to the
securities offered hereby. As of the date of this Prospectus, certain attorneys
of Venture Law Group beneficially owned approximately 1,231 shares of Target
Common Stock and approximately 26,795 shares of Collagen Common Stock (including
currently exercisable options to purchase 24,000 shares of Common Stock).
Michael W. Hall, a director of Venture Law Group, is the Secretary of Target.
Craig W. Johnson, also a director of Venture Law Group, is a director and the
Secretary of Collagen.
 
                                    EXPERTS
 
     The consolidated financial statements of Collagen Corporation at June 30,
1994 and 1993, and for each of the three years in the period ended June 30,
1994, and the consolidated financial statements of Target Therapeutics, Inc. at
March 31, 1994 and 1993, and for each of the three years in the period ended
March 31, 1994, appearing in this Prospectus and Registration Statement have
been audited by Ernst & Young LLP, independent auditors, as set forth in their
reports thereon appearing elsewhere herein and in the Registration Statement,
and are included in reliance upon such reports given upon the authority of such
firm as experts in accounting and auditing.
 
                                       85
<PAGE>   88
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
COLLAGEN
Report of Ernst & Young LLP, Independent Auditors....................................    F-2
Consolidated Balance Sheets -- June 30, 1994 and 1993................................    F-3
Consolidated Statements of Operations -- Years ended June 30, 1994, 1993 and 1992....    F-4
Consolidated Statement of Stockholders' Equity -- Years ended June 30, 1994, 1993 and
  1992...............................................................................    F-5
Consolidated Statements of Cash Flows -- Years ended June 30, 1994, 1993 and 1992....    F-6
Notes to Consolidated Financial Statements...........................................    F-7
Condensed Consolidated Balance Sheets -- December 31, 1994 and June 30, 1994
  (unaudited)........................................................................   F-17
Condensed Consolidated Statements of Income -- Six months ended December 31, 1994 and
  1993 (unaudited)...................................................................   F-18
Condensed Consolidated Statements of Cash Flows -- Six months ended December 31, 1994
  and 1993 (unaudited)...............................................................   F-19
Notes to Condensed Consolidated Financial Statements (unaudited).....................   F-20
TARGET
Report of Ernst & Young LLP, Independent Auditors....................................   F-22
Consolidated Balance Sheets -- March 31, 1994 and 1993...............................   F-23
Consolidated Statements of Income -- Years ended March 31, 1994, 1993 and 1992.......   F-24
Consolidated Statement of Stockholders' Equity -- Years ended March 31, 1994, 1993
  and 1992...........................................................................   F-25
Consolidated Statements of Cash Flows -- Years ended March 31, 1994, 1993 and 1992...   F-26
Notes to Consolidated Financial Statements...........................................   F-27
Condensed Consolidated Balance Sheets -- December 31, 1994 and March 31, 1994
  (unaudited)........................................................................   F-36
Condensed Consolidated Statements of Income -- Nine months ended
  December 31, 1994 and 1993 (unaudited).............................................   F-37
Condensed Consolidated Statements of Cash Flows -- Nine months ended
  December 31, 1994 and 1993 (unaudited).............................................   F-38
Notes to Condensed Consolidated Financial Statements (unaudited).....................   F-39
</TABLE>
 
                                       F-1
<PAGE>   89
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Collagen Corporation
 
We have audited the accompanying consolidated balance sheets of Collagen
Corporation as of June 30, 1994 and 1993, and the related consolidated
statements of operations, stockholders' equity and cash flows for each of the
three years in the period ended June 30, 1994. These financial statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the consolidated financial position of
Collagen Corporation at June 30, 1994 and 1993, and the consolidated results of
its operations and its cash flows for each of the three years in the period
ended June 30, 1994, in conformity with generally accepted accounting
principles.
 
As discussed in Notes 1 and 9 to the consolidated financial statements, in 1993
the Company changed its method of accounting for income taxes.
 
                                          ERNST & YOUNG LLP
 
Palo Alto, California
August 3, 1994
 
                                       F-2
<PAGE>   90
 
                              COLLAGEN CORPORATION
 
                          CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                               JUNE 30,
                                                                          ------------------
                                                                            1994      1993
                                                                          --------   -------
<S>                                                                       <C>        <C>
ASSETS
Current assets:
  Cash, cash equivalents and short-term investments.....................  $ 12,736   $19,630
  Accounts receivable, less allowance for doubtful accounts
     ($353 in 1994 and $416 in 1993)....................................    12,241     9,273
  Inventories...........................................................     3,861     4,167
  Other current assets..................................................     3,305     3,973
                                                                          --------   -------
          Total current assets..........................................    32,143    37,043
Property and equipment, net.............................................    17,108    16,464
Intangible assets.......................................................     2,243     2,491
Investment in Target Therapeutics, Inc..................................    17,499    15,823
Other investments and assets............................................     5,512     4,385
                                                                          --------   -------
                                                                          $ 74,505   $76,206
                                                                          =========  ========
 
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable......................................................  $  1,420   $ 1,365
  Accrued compensation..................................................     2,169     2,575
  Accrued liabilities...................................................     8,076     6,015
  Income taxes payable..................................................     4,251     2,531
                                                                          --------   -------
          Total current liabilities.....................................    15,916    12,486
Deferred income taxes...................................................     8,240     7,846
Other long-term liabilities.............................................     1,267       938
Commitments and contingencies...........................................
Stockholders' equity:
  Preferred stock, $.01 par value, authorized 5,000,000 shares; none
     issued and outstanding.............................................        --        --
  Common shares, $.01 par value, authorized 28,950,000 shares; issued
     10,354,633 shares in 1994 (10,111,970 shares in 1993)..............       104       101
  Additional paid-in capital............................................    61,172    56,925
  Retained earnings.....................................................     9,882     5,905
  Cumulative translation adjustment.....................................      (648)     (414)
  Treasury stock, 937,500 shares in 1994 (370,000 shares in 1993).......   (21,428)   (7,581)
                                                                          --------   -------
          Total stockholders' equity....................................    49,082    54,936
                                                                          --------   -------
                                                                          $ 74,505   $76,206
                                                                          =========  ========
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       F-3
<PAGE>   91
 
                              COLLAGEN CORPORATION
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                   YEARS ENDED JUNE 30,
                                                              -------------------------------
                                                               1994        1993       1992(1)
                                                              -------     -------     -------
<S>                                                           <C>         <C>         <C>
Revenues:
  Product sales.............................................  $64,552     $49,743     $65,782
  Other.....................................................    1,000          --       1,400
                                                              -------     -------     -------
                                                               65,552      49,743      67,182
Cost and expenses:
  Cost of sales.............................................   18,940      15,659      22,759
  Research and development..................................    9,366       8,767      12,023
  Selling, general and administrative.......................   28,639      29,176      38,694
                                                              -------     -------     -------
                                                               56,945      53,602      73,476
                                                              -------     -------     -------
Income (loss) from operations...............................    8,607      (3,859)     (6,294)
Other income (expense):
  Net gain from investments, principally Target
     Therapeutics, Inc. ....................................       --      20,323       9,439
  Equity in earnings (losses) of affiliates.................     (269)        968         (32)
  Interest income...........................................      510         880       1,586
  Interest expense..........................................       --          --        (796)
                                                              -------     -------     -------
Income before income taxes, minority interest and
  discontinued operations...................................    8,848      18,312       3,903
Provision for income taxes..................................    3,928       8,580       1,262
Minority interest in earnings of Target Therapeutics,
  Inc. .....................................................       --          --       1,233
                                                              -------     -------     -------
Income from continuing operations...........................    4,920       9,732       1,408
Loss from discontinued operations, net of tax...............       --          --        (261)
                                                              -------     -------     -------
Income before cumulative effect of accounting change........    4,920       9,732       1,147
Cumulative effect of change in accounting for income
  taxes.....................................................       --        (989)         --
                                                              -------     -------     -------
Net income..................................................  $ 4,920     $ 8,743     $ 1,147
                                                              ========    ========    ========
Income (loss) per share:
  Continuing operations.....................................  $   .50     $   .95     $   .14
  Discontinued operations...................................       --          --        (.03)
  Cumulative effect of accounting change....................       --        (.10)         --
                                                              -------     -------     -------
          Net income per share..............................  $   .50     $   .85     $   .11
                                                              ========    ========    ========
Shares used in calculating per share information............    9,896      10,267      10,232
                                                              ========    ========    ========
</TABLE>
 
---------------
(1) Includes consolidated results of Target Therapeutics, Inc. See Note 3 to the
    Consolidated Financial Statements.
 
        The accompanying notes are an integral part of these statements.
 
                                       F-4
<PAGE>   92
 
                              COLLAGEN CORPORATION
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                            YEARS ENDED JUNE 30, 1994, 1993 AND 1992
                             -----------------------------------------------------------------------
                                                   RETAINED
                                     ADDITIONAL    EARNINGS    CUMULATIVE                  TOTAL
                             COMMON   PAID-IN    (ACCUMULATED  TRANSLATION  TREASURY   STOCKHOLDERS'
                             STOCK    CAPITAL      DEFICIT)    ADJUSTMENT    STOCK        EQUITY
                             ------  ----------  ------------  ----------   --------   -------------
<S>                          <C>     <C>         <C>           <C>          <C>        <C>
Balances at June 30, 1991...  $ 97    $ 41,756     $ (3,985)     $  (70)    $     --     $  37,798
 
Sales of common stock under
  options and employee stock
  purchase plan.............     3       2,469           --          --           --         2,472
Tax benefit relating to
  stock options.............    --         775           --          --           --           775
Residual equity in Target
  Therapeutics, Inc. stock
  proceeds..................    --      14,901           --          --           --        14,901
Foreign currency translation
  adjustment................    --          --           --          81           --            81
Net income..................    --          --        1,147          --           --         1,147
                             ------  ----------  ------------  ----------   --------   -------------
Balances at June 30, 1992...   100      59,901       (2,838)         11           --        57,174
 
Change in method of
  accounting for income
  taxes.....................    --      (4,346)          --          --           --        (4,346)
Sale of common stock under
  options and employee stock
  purchase plan.............     1       1,009           --          --           --         1,010
Tax benefit relating to
  stock options.............    --         298           --          --           --           298
Foreign currency translation
  adjustment and other......    --          63           --        (425)          --          (362)
Treasury stock purchased....    --          --           --          --       (7,581)       (7,581)
Net income..................    --          --        8,743          --           --         8,743
                             ------  ----------  ------------  ----------   --------   -------------
Balances at June 30, 1993...   101      56,925        5,905        (414)      (7,581)       54,936
 
Sale of common stock under
  options and employee stock
  purchase plan.............     3       2,909           --          --           --         2,912
Tax benefit relating to
  stock options.............    --       1,338           --          --           --         1,338
Foreign currency translation
  adjustment................    --          --           --        (234)          --          (234)
Dividends declared ($.10 per
  share)....................    --          --         (943)         --           --          (943)
Treasury stock purchased....    --          --           --          --      (13,847)      (13,847)
Net income..................    --          --        4,920          --           --         4,920
                             ------  ----------  ------------  ----------   --------   -------------
Balances at June 30, 1994...  $104    $ 61,172     $  9,882      $ (648)    $(21,428)    $  49,082
                             ======== =========  ===========   =========    =========  ===========
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                       F-5
<PAGE>   93
 
                              COLLAGEN CORPORATION
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                        YEARS ENDED JUNE 30,
                                                                                 ----------------------------------
                                                                                   1994         1993       1992(1)
                                                                                 --------     --------     --------
<S>                                                                              <C>          <C>          <C>
Cash flows from operating activities:
  Net income...................................................................  $  4,920     $  8,743     $  1,147
  Adjustments to reconcile net income to net cash provided by (used in)
    operating activities:
      Depreciation and amortization............................................     3,909        3,808        4,656
      Deferred income taxes....................................................       553       (4,711)         812
      Tax benefit relating to stock options....................................     1,338          298          775
      Gain on investment in Target Therapeutics, Inc. .........................        --      (20,323)     (10,239)
      Loss on investment and asset disposals...................................        --           --        1,426
      Minority interest in Target Therapeutics, Inc. ..........................        --           --        1,233
      Discontinued operations, including provision for loss on disposal........        --           --          507
      Cumulative effect of accounting change...................................        --          989           --
      Decrease (increase) in assets:
        Accounts receivable....................................................    (2,968)      (1,588)       1,524
        Inventories............................................................       306        2,068       (1,542)
        Other..................................................................       285        3,475       (2,753)
      Increase (decrease) in liabilities:
        Accounts payable and accrued liabilities...............................       764       (3,650)       1,840
        Income taxes payable...................................................     1,720        1,854          614
        Other long-term liabilities............................................      (126)         (21)         377
                                                                                 --------     --------     --------
          Total adjustments....................................................     5,781      (17,801)        (770)
                                                                                 --------     --------     --------
  Net cash provided by (used in) operating activities..........................    10,701       (9,058)         377
                                                                                 --------     --------     --------
Cash flows from investing activities:
  Dividends received and net proceeds from sale of Target Therapeutics, Inc.
    stock......................................................................        --       28,456       10,701
  Reduction in cash from deconsolidation of Target Therapeutics, Inc. .........        --       (5,974)          --
  Target Therapeutics, Inc. dividend paid......................................        --           --         (314)
  Proceeds from sale of short-term investments.................................    15,331       27,561       31,104
  Purchase of short-term investments...........................................   (12,362)     (34,935)     (54,067)
  Expenditures for investments in affiliates...................................    (2,378)      (3,025)        (552)
  Expenditures for property and equipment......................................    (4,011)      (2,510)      (4,479)
  Decrease (increase) in intangible and other assets...........................      (269)        (663)         598
                                                                                 --------     --------     --------
    Net cash provided by (used in) investing activities........................    (3,689)       8,910      (17,009)
                                                                                 --------     --------     --------
Cash flows from financing activities:
  Repurchase of common stock...................................................   (13,847)      (7,581)          --
  Net proceeds from issuance of common stock...................................     2,910        1,009        3,266
  Issuance of stock by Target Therapeutics, Inc. ..............................        --           --       31,002
  Repayment of long-term note and other obligations............................        --           --      (12,806)
                                                                                 --------     --------     --------
    Net cash provided by (used in) financing activities........................   (10,937)      (6,572)      21,462
                                                                                 --------     --------     --------
Net increase (decrease) in cash and cash equivalents...........................    (3,925)      (6,720)       4,830
Cash and cash equivalents at beginning of period...............................     9,294       16,014       11,184
                                                                                 --------     --------     --------
Cash and cash equivalents at the end of period.................................  $  5,369     $  9,294     $ 16,014
                                                                                 =========    =========    =========
</TABLE>
 
---------------
(1) Includes consolidated results of Target Therapeutics, Inc. See Note 3 to the
    Consolidated Financial Statements.
 
        The accompanying notes are an integral part of these statements.
 
                                       F-6
<PAGE>   94
 
                              COLLAGEN CORPORATION
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     Principles of consolidation.  The consolidated financial statements include
the accounts of Collagen Corporation (the "Company"), a Delaware corporation,
and its wholly-owned and majority-owned subsidiaries. All significant
intercompany accounts and transactions have been eliminated. The financial
statements for fiscal 1992 only reflect the consolidation of Target
Therapeutics, Inc. ("Target"). Investments in unconsolidated subsidiaries, and
other investments in which the Company has a 20% to 50% interest, or otherwise
exercises significant influence, are accounted for under the equity method. (See
Note 3).
 
     Investments in companies in which the Company has less than a 20% interest
are carried at cost or estimated realizable value, if less. In fiscal 1992, an
investment was written down by $800,000 to its estimated realizable value.
 
     Increases in the Company's carrying value arising from issuances of
Target's stock in 1992 were reflected in income to the extent such increases
were represented by the receipt of cash by the Company.
 
     Cash equivalents and short-term investments.  The Company considers all
highly liquid investments with a maturity from date of purchase of three months
or less to be cash equivalents. Short-term investments consist principally of
bankers acceptances, commercial paper and master notes and are stated at cost,
which approximates market.
 
     In May 1993, the Financial Accounting Standards Board issued SFAS No. 115,
"Accounting for Certain Investments in Debt and Equity Securities." The Company
adopted SFAS No. 115 effective July 1, 1994. Had the Standard been adopted as of
June 30, 1994, there would not have been a material impact on the Company's
financial position.
 
     Inventories.  Inventories are valued at the lower of cost, determined on a
standard cost basis which approximates average cost, or market.
 
     Property and equipment.  Depreciation and amortization of property and
equipment are provided on the straight-line method over estimated useful lives
as follows:
 
<TABLE>
            <S>                                                     <C>
            Machinery and equipment..............................   5-10 years
            Leasehold improvements...............................   Term of lease
</TABLE>
 
     Intangible assets.  Intangible assets are amortized using the straight-line
method. Patents are amortized over a seventeen-year period beginning with the
effective date or over the remainder of such period from the date acquired.
Trademarks are amortized over a twenty-year period beginning with their filing
dates. Organization costs are amortized over a five-year period.
 
     Other assets.  Other assets include loans to employees and directors
totaling $285,000 and $472,000, at June 30, 1994 and 1993, respectively.
 
     Revenue recognition.  Revenue from product sales is recognized at time of
shipment. Income from direct sales by C.R. Bard, Inc. ("Bard") to physicians is
earned by the Company when the physicians are invoiced.
 
     Concentration of credit risk.  The Company sells its plastic surgery and
dermatological products primarily to physicians and pharmacies in North America,
Europe and the Pacific Rim. The Company sells Contigen Bard Collagen Implant
("Contigen Implant") to Bard, its marketing partner for Contigen Implant, and
Collagraft Bone Graft Matrix and Collagraft Bone Graft Matrix Strip to Zimmer,
Inc., the Company's marketing partner for Collagraft products. The Company
 
                                       F-7
<PAGE>   95
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
performs ongoing credit evaluations of its customers and generally does not
require collateral. The Company maintains reserves for potential credit losses
and such losses have been within managements's expectations.
 
     The Company allows, on occasion, its customers to return product for
credit, and also allows customers to return defective or damaged product for
credit or replacement. Written authorization from the Company is required to
return merchandise. Some domestic and foreign customers are subject to extended
payment terms. These practices have not had a material effect on the Company's
working capital practices.
 
     The Company invests its excess cash in deposits with major banks and in
money market securities of companies with strong credit ratings and from a
variety of industries. These securities are typically short-term in nature and,
therefore, bear minimal risk. The Company has not experienced any losses on its
money market investments.
 
     Income taxes.  Effective July 1, 1992, the Company prospectively adopted
the liability method of accounting for income taxes as required by SFAS No. 109,
"Accounting for Income Taxes." Prior to the adoption of SFAS No. 109, the
Company accounted for income taxes under the deferred method of APB No. 11. (See
Note 9.)
 
     Earnings per share.  Earnings per share have been computed based upon the
weighted average number of common and dilutive common equivalent shares
outstanding. Common equivalent shares result from stock options.
 
     Foreign currency translation.  The functional currency for each foreign
subsidiary is its respective foreign currency. Accordingly, all assets and
liabilities related to these operations are translated at the current exchange
rates at the end of each period. The resulting cumulative translation
adjustments are recorded directly to the accumulated foreign currency
translation adjustment account included in stockholders' equity. Revenues and
expenses are translated at average exchange rates in effect during the period.
Foreign currency transaction gains and losses are included in results of
operations.
 
     It is the Company's policy to hedge material foreign currency transaction
exposures. There are no significant unhedged monetary assets, liabilities or
commitments in aggregate.
 
     Forward exchange contracts.  The Company enters into foreign currency
forward exchange contracts with various issuers to hedge against the effects of
fluctuating currency rates on its net foreign currency position denominated in
currencies other than the United States dollar. The Company's net foreign
currency position is approximately equal to its foreign subsidiary assets minus
liabilities resulting from transaction related exposures. The forward exchange
contracts are readily tradable major European currencies and the unhedged
exposure on the balance sheet is immaterial. The risk of loss should an issuer
not perform is the same as if the net foreign currency position was unhedged and
therefore limited to the impact of foreign currency exchange rate fluctuations.
Gains and losses on forward exchange contracts, based on the difference between
the forward exchange rate and the actual spot rate at the time of valuation, are
generally deferred and accumulated in a separate component of stockholders'
equity to the extent such contracts are designated as hedges of a net investment
in a foreign entity. There were no deferred gains or losses on forward contracts
at June 30, 1994 and 1993.
 
     Reclassification.  Certain prior year amounts in the consolidated financial
statements have been reclassified to conform with the current year presentation.
 
                                       F-8
<PAGE>   96
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
2. BALANCE SHEET INFORMATION
 
<TABLE>
<CAPTION>
                                                                         JUNE 30,
                                                                   ---------------------
                                                                     1994         1993
                                                                   --------     --------
                                                                      (IN THOUSANDS)
    <S>                                                            <C>          <C>
    Cash, cash equivalents and short-term investments:
      Cash and cash equivalents..................................  $  5,369     $  9,294
      Short-term investments.....................................     7,367       10,336
                                                                   --------     --------
                                                                   $ 12,736     $ 19,630
                                                                   =========    =========
    Other current assets:
      Deferred taxes.............................................  $  2,501     $  3,414
      Other......................................................       804          559
                                                                   --------     --------
                                                                   $  3,305     $  3,973
                                                                   =========    =========
    Inventories:
      Raw materials..............................................  $    625     $    372
      Work-in process............................................     1,763        1,830
      Finished goods.............................................     1,473        1,965
                                                                   --------     --------
                                                                   $  3,861     $  4,167
                                                                   =========    =========
    Property and equipment, net:
      Machinery and equipment, at cost...........................  $ 21,544     $ 18,103
      Leasehold improvements, at cost............................    11,835       11,443
                                                                   --------     --------
                                                                     33,379       29,546
      Less accumulated depreciation and amortization.............   (16,271)     (13,082)
                                                                   --------     --------
                                                                   $ 17,108     $ 16,464
                                                                   =========    =========
    Intangible assets:
      Patents, trademarks, and other.............................  $  2,910     $  2,606
      Organization costs*........................................     1,451        1,435
                                                                   --------     --------
                                                                      4,361        4,041
      Less amortization..........................................    (2,118)      (1,550)
                                                                   --------     --------
                                                                   $  2,243     $  2,491
                                                                   =========    =========
    Accrued liabilities:
      Dividends payable..........................................  $    943     $     --
      Other accrued liabilities..................................     7,133        6,015
                                                                   --------     --------
                                                                   $  8,076     $  6,015
                                                                   =========    =========
</TABLE>
 
---------------
* In March 1991, the Company formed Collagen International, Inc., a completely
  new and wholly-owned subsidiary of the Company, to assume responsibility for
  the direct sales and marketing of its products used in reconstructive and
  cosmetic applications for the face in nine European countries, Australia and
  New Zealand from Essex Chernie, A.G., a subsidiary of Schering-Plough
  Corporation. Organization costs are related to the formation of Collagen
  International, Inc.
 
                                       F-9
<PAGE>   97
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
3. INVESTMENT IN TARGET THERAPEUTICS, INC.
 
     The Company recorded a $10.2 million gain from its investment in Target, in
fiscal 1992. The gain consisted of cash received by the Company from a dividend
paid by Target and sale of Target common stock held by the Company in connection
with Target's initial public offering of approximately 2.6 million shares of its
common stock at $18 per share. Prior to Target's initial public offering,
Collagen's ownership position in Target was approximately 87%. After the
offering and sale, Collagen's ownership position was reduced to approximately
52%.
 
     In December 1992, the Company sold 1,129,700 shares of common stock of
Target, for approximately $28.5 million, decreasing its ownership position from
52% to approximately 34%. The gain before taxes from the sale of the stock was
$20.3 million. The accounts and operating results of Target were consolidated
with the Company until the end of fiscal 1992. After fiscal 1992 the Company's
investment in Target is being accounted for under the equity method. The
Company's ownership position in Target as of June 30, 1994 was approximately
33%.
 
     Condensed financial information for Target is shown below:
 
                           BALANCE SHEET INFORMATION
 
<TABLE>
<CAPTION>
                                                                       AS OF JUNE 30,
                                                                     -------------------
                                                                      1994        1993
                                                                     -------     -------
                                                                       (IN THOUSANDS)
    <S>                                                              <C>         <C>
    Current assets.................................................  $52,152     $43,196
    Property and equipment.........................................    4,856       4,450
    Other..........................................................    3,296       1,092
                                                                     -------     -------
              Total assets.........................................  $60,304     $48,738
                                                                     ========    ========
 
    Current liabilities............................................  $ 9,260     $ 4,379
    Long-term liabilities..........................................      113         144
    Stockholders' equity...........................................   50,931      44,215
                                                                     -------     -------
              Total liabilities and stockholders' equity...........  $60,304     $48,738
                                                                     ========    ========
    Collagen's share of net assets.................................  $17,499     $15,823
                                                                     ========    ========
</TABLE>
 
                        STATEMENT OF INCOME INFORMATION
 
<TABLE>
<CAPTION>
                                                                    TWELVE MONTHS ENDED
                                                                         JUNE 30,
                                                                   ---------------------
                                                                     1994         1993
                                                                   --------     --------
                                                                      (IN THOUSANDS)
    <S>                                                            <C>          <C>
    Net sales....................................................  $ 38,275     $ 29,585
    Costs and expenses...........................................   (32,260)     (24,666)
    Interest and other income....................................     1,894          755
                                                                   --------     --------
    Income before income taxes and cumulative effect of
      accounting change..........................................     7,909        5,674
    Provision for income taxes...................................    (2,780)      (1,867)
    Cumulative effect of accounting change.......................        --          631
                                                                   --------     --------
              Net income.........................................  $  5,129     $  4,438
                                                                   =========    =========
    Collagen's share (included in equity in
      earnings of affiliates)....................................  $  1,676     $  1,455
                                                                   =========    =========
</TABLE>
 
                                      F-10
<PAGE>   98
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Target's product sales for the twelve months ended June 30, 1992 included
in the Company's consolidated results for that year were $21.1 million. The
contribution of Target's operating results to the Company's consolidated net
income for the twelve months ended June 30, 1992 was $3.2 million. Other
revenues of $1.4 million recorded in fiscal 1992 by Target represented payments
received under the terms of a research and development arrangement between
Target and its joint venture partner in Japan, Century Medical, Inc.
 
     Target's common stock is quoted on the Nasdaq National Market. The closing
price of Target's stock at June 30, 1994 was $23.25 per share. The Company held
2,294,194 shares of Target's common stock at June 30, 1994.
 
4. COMMITMENTS
 
     Future minimum lease payments under noncancelable operating leases at June
30, 1994 are as follows:
 
<TABLE>
<CAPTION>
                                                                       (IN
                                                                   THOUSANDS)
            <S>                                                   <C>
            1995................................................     $ 4,677
            1996................................................       4,431
            1997................................................       4,367
            1998................................................       4,028
            1999................................................       3,744
            Thereafter..........................................      15,949
                                                                  -------------
                      Total minimum lease payments..............     $37,196
                                                                  ==============
</TABLE>
 
     Rental expense for fiscal 1994 was approximately $4,643,000 ($4,672,000 in
1993 and $4,872,000 in 1992). The fiscal 1992 expense is net of $500,000 of
sublease rental income.
 
     At June 30, 1994 and 1993, the Company had outstanding forward exchange
contracts maturing in July, 1994 and 1993 of approximately $5,416,000 and
$7,657,000, respectively, to buy foreign currency of seven countries in which it
operates. At June 30, 1994 and 1993, the fair market values of the Company's
foreign currency exchange forward contracts approximated cost. The Company is
required to maintain a cash equivalent balance of $2 million as collateral for
the forward exchange contracts.
 
5. LEGAL MATTERS
 
     The Company is involved in legal actions, including product liability
claims, arising in the ordinary course of business. While the outcome of such
matters is currently not determinable, it is management's opinion that these
matters will not have a material adverse effect on the Company's consolidated
financial position or results of its operations.
 
6. STOCKHOLDERS' EQUITY
 
     Stock Options.  The Company has various stock option plans under which
incentive stock options or non-statutory stock options may be granted to
officers, directors, key employees and consultants to purchase the Company's
common stock. The options are granted at no less than the fair market value at
the dates of grant. Incentive stock options become exercisable at the rate of
two percent each month beginning the first full month after the date of grant
unless accelerated by the Board of Directors. Non-statutory stock options become
exercisable on a monthly or yearly basis as determined by the Board of Directors
at the date of grant.
 
     At June 30, 1994, the total number of shares of common stock issued or
reserved for issuance under the Company's current stock option plans was
3,200,000.
 
                                      F-11
<PAGE>   99
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Stock option activities under the stock option plans were as follows:
 
<TABLE>
<CAPTION>
                                                                OPTION           NUMBER
                                                NUMBER        PRICE RANGE       OF SHARES
                                               OF SHARES       PER SHARE       EXERCISABLE
                                               ---------     -------------     -----------
    <S>                                        <C>           <C>               <C>
    OUTSTANDING AT JUNE 30, 1992.............  1,081,269     $ 4.69-$28.25         761,142
    Granted..................................    334,244      18.00- 25.50
    Exercised................................    (77,831)      5.50- 20.00
    Canceled or expired......................    (52,510)      7.25- 28.25
                                               ---------
    OUTSTANDING AT JUNE 30, 1993.............  1,285,172       4.69- 28.25         832,120
    Granted..................................    229,760      22.13- 26.00
    Exercised................................   (209,922)      5.13- 26.50
    Canceled or expired......................    (54,030)      7.25- 28.25
                                               ---------
    OUTSTANDING AT JUNE 30, 1994.............  1,250,980     $ 4.69-$28.25         780,412
                                               =========
    AVAILABLE FOR GRANT AT
      JUNE 30, 1994..........................    848,771
                                               =========
</TABLE>
 
     Stock Purchase Plan.  In 1985, the Company established an employee stock
purchase plan under which 450,000 shares of the Company's common stock were
reserved for issuance to employees. Subsequently, the Company increased the
authorization to 600,000 shares. Under the plan, the Company's employees,
subject to certain restrictions, may purchase shares at a price per share that
is the lesser of 85 percent of the fair market value as of the beginning or
close of the yearly offering period.
 
     For fiscal 1994, 1993 and 1992, shares issued under the plan were 32,741,
23,103 and 24,417, respectively. The average issuance price per share was
$19.00, $18.27 and $18.61 for fiscal 1994, 1993 and 1992, respectively. At June
30, 1994, 138,093 shares remained available for future sales under this plan.
 
     Stock Repurchase Program.  In February 1993, the Company's Board of
Directors authorized a stock repurchase program. In fiscal 1993, the Company
repurchased 370,000 shares at an average acquisition price of approximately $21
per share. In fiscal 1994, the Company repurchased 567,500 shares at an average
acquisition price of approximately $24 per share. As of June 30, 1994, the
Company is authorized to repurchase an additional 262,500 shares under the
program. The Company plans to retain repurchased shares as treasury stock but
may use a portion of the stock in various company stock benefit plans.
 
7. INTERNATIONAL SALES AND DISTRIBUTION RIGHTS
 
     Consolidated export sales were $20.8 million in fiscal 1994, $21.4 million
in fiscal 1993 and $35.1 million in fiscal 1992. These export sales are
primarily in Europe, Canada and the Pacific Rim.
 
     The Company markets its products internationally directly in Canada, ten
European countries, Australia and New Zealand and via distributors in other
countries. The Company pays commissions to its former European distributor based
upon a percentage of net sales.
 
8. MAJOR CUSTOMER
 
     During fiscal 1994, the Company had $16.7 million of revenue from its
marketing partner, Bard, which has exclusive worldwide marketing and
distribution rights for Contigen Implant, a product introduced in fiscal 1994.
The $16.7 million, representing approximately 26% of the Company's total
 
                                      F-12
<PAGE>   100
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
product sales in fiscal 1994, was comprised of sales of $15.9 million of
Contigen Implant and $789,000 of income from Bard's direct sales of Contigen
Implant to physicians. The Company also recorded other revenue in fiscal 1994
which consisted of $1.0 million in the form of a milestone payment from Bard
earned upon the Company's receipt of clearance from the U.S. Food and Drug
Administration. No single customer accounted for more than 10% of total revenue
in prior years.
 
9. INCOME TAXES
 
     The Company prospectively adopted the liability method of accounting for
income taxes required by SFAS No. 109 effective July 1, 1992. The cumulative
effect of adopting SFAS No. 109 in fiscal 1993 was to decrease net income by
$989,000. Previously, income taxes were accounted for under the deferred method
under APB No. 11.
 
     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax assets and liabilities under SFAS No. 109 as of June
30, 1994 and June 30, 1993 are presented as follows:
 
<TABLE>
<CAPTION>
                                                                           JUNE 30,
                                                                      ------------------
                                                                       1994        1993
                                                                      -------     ------
                                                                      (IN THOUSANDS)
    <S>                                                               <C>         <C>
    Deferred tax liabilities:
      Property and equipment........................................  $   619     $1,144
      Intangible assets.............................................      587        372
      Investments...................................................    7,034      6,330
                                                                      -------     ------
              Total deferred tax liabilities........................    8,240      7,846
                                                                      -------     ------
 
    Deferred tax assets:
      Accounts receivable...........................................      672        355
      Inventories...................................................      495        896
      State income taxes............................................      311        480
      Net operating loss carry forwards.............................      181        347
      Equity in losses of affiliates................................    1,416        631
      Non-deductible accruals.......................................    1,588      1,444
      Accrued compensation..........................................      407        359
      Valuation allowance...........................................   (1,597)      (880)
                                                                      -------     ------
              Total deferred tax assets.............................    3,473      3,632
                                                                      -------     ------
              Net deferred tax liabilities..........................  $ 4,767     $4,214
                                                                      ========    ======
</TABLE>
 
     The valuation allowance increased by $717,000 in fiscal 1994 and decreased
by $190,000 in fiscal 1993.
 
                                      F-13
<PAGE>   101
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Significant components of the provision for income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                                 YEARS ENDED JUNE 30,
                                                           --------------------------------
                                                            1994        1993         1992
                                                           -------     -------     --------
                                                           LIABILITY   LIABILITY   DEFERRED
                                                           METHOD      METHOD       METHOD
                                                           -------     -------     --------
                                                           (IN THOUSANDS)
    <S>                                                    <C>         <C>         <C>
    Current:
      Federal............................................  $2,732      $ 8,907      $  310
      Foreign............................................     187          250         (21)
      State..............................................     456        2,089          20
                                                           -------     -------     --------
              Total current..............................   3,375       11,246         309
                                                           -------     -------     --------
 
    Deferred:
      Federal............................................     352       (2,111)        700
      State..............................................     201         (555)        112
                                                           -------     -------     --------
              Total deferred.............................     553       (2,666)        812
                                                           -------     -------     --------
                                                           $3,928      $ 8,580      $1,121
                                                           =======     ========    =======
</TABLE>
 
     For financial reporting purposes, the provision for income taxes includes
the following components:
 
<TABLE>
<CAPTION>
                                                                 YEARS ENDED JUNE 30,
                                                            ------------------------------
                                                             1994       1993        1992
                                                            LIABILITY  LIABILITY  DEFERRED
                                                            METHOD     METHOD      METHOD
                                                            ------     ------     --------
                                                                    (IN THOUSANDS)
    <S>                                                     <C>        <C>        <C>
    Continuing operations.................................  $3,928     $8,580      $1,262
    Discontinued operations...............................      --         --        (141)
                                                            ------     ------     --------
                                                            $3,928     $8,580      $1,121
                                                            ======     ======     =======
</TABLE>
 
     For financial reporting purposes, income before income taxes and minority
interest includes the following components:
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED JUNE 30,
                                                           ------------------------------
                                                            1994       1993        1992
                                                           ------     -------     -------
                                                                   (IN THOUSANDS)
    <S>                                                    <C>        <C>         <C>
    Continuing operations................................  $8,848     $18,312     $ 3,903
    Discontinued operations..............................      --          --        (402)
                                                           ------     -------     -------
                                                           $8,848     $18,312     $ 3,501
                                                           ======     ========    ========
    Domestic operations..................................  $8,636     $16,508     $ 5,137
    Foreign operations...................................     212       1,804      (1,636)
                                                           ------     -------     -------
                                                           $8,848     $18,312     $ 3,501
                                                           ======     ========    ========
</TABLE>
 
                                      F-14
<PAGE>   102
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The provision for income taxes differs from the amount computed by applying
the statutory federal income tax rate to income before taxes. The sources and
tax effects of the differences are as follows:
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED JUNE 30,
                                                           -------------------------------
                                                            1994       1993         1992
                                                           LIABILITY  LIABILITY   DEFERRED
                                                           METHOD     METHOD       METHOD
                                                           ------     -------     --------
                                                                   (IN THOUSANDS)
    <S>                                                    <C>        <C>         <C>
    Income before income taxes, minority interest
      and discontinued operations........................  $8,848     $18,312      $3,501
                                                           ======     ========    =======
    Expected tax at 34%..................................  $3,008     $ 6,226      $1,190
    State income tax, net of federal benefit.............     434       1,012          87
    Net operating losses of subsidiaries for which no
      current benefit is realizable......................     (45)        612         652
    Equity in losses of affiliates.......................     660         165          --
    Tax credits recognized...............................    (315)         --        (179)
    Foreign Sales Corporation benefit....................    (150)         --        (238)
    Investment gains and losses..........................      --          --        (365)
    Other................................................     336         565         (26)
                                                           ------     -------     --------
                                                           $3,928     $ 8,580      $1,121
                                                           ======     ========    =======
</TABLE>
 
     The components of the provision for deferred income taxes for fiscal 1992
under the deferred method are as follows:
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED JUNE 30,
                                                                       -------------------
                                                                              1992
                                                                       -------------------
                                                                         (IN THOUSANDS)
    <S>                                                                <C>
    Non-deductible accruals..........................................        $   161
    Accrued compensation.............................................            (94)
    Inventory reserves...............................................           (485)
    Depreciation.....................................................           (150)
    Investments valued at market.....................................          1,405
    Other............................................................            (25)
                                                                            --------
      Provision for deferred income taxes............................        $   812
                                                                       =================
</TABLE>
 
10. DISCONTINUED OPERATIONS
 
     In fiscal 1992, the Company sold the assets of its dental implant operation
(primarily inventories and fixed assets) for $1.0 million in the form of cash
and a secured note. The Company also discontinued its pharmaceutical
distribution business, SummaCare, Inc. ("Summa") in fiscal 1992. The Company
sold the Summa business (primarily inventory and fixed assets) in June 1992 for
$41,000 in cash. The results of operations for the dental implant business and
the third quarter fiscal 1992 results for Summa are presented separately as
discontinued operations. Revenues were $277,000 for the dental implant business
for fiscal 1992.
 
                                      F-15
<PAGE>   103
 
                              COLLAGEN CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
11. STATEMENT OF CASH FLOWS
 
     Supplemental disclosures of cash flow information:
 
<TABLE>
<CAPTION>
                                                                   YEARS ENDED JUNE 30,
                                                                 ------------------------
                                                                 1994      1993      1992
                                                                 ----     ------     ----
                                                                      (IN THOUSANDS)
    <S>                                                          <C>      <C>        <C>
    Cash paid during the year for:
      Interest (net of capitalized interest)...................  $ --     $   --     $928
      Income taxes (net of refunds)............................   (54)     6,934      847
    Non-cash financing activity:
      Dividends declared.......................................  $943     $   --     $ --
</TABLE>
 
                                      F-16
<PAGE>   104
 
                              COLLAGEN CORPORATION
 
                     CONDENSED CONSOLIDATED BALANCE SHEETS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,     JUNE 30,
                                                                        1994           1994
                                                                    ------------     --------
                                                                    (UNAUDITED)      (NOTE 1)
<S>                                                                 <C>              <C>
                                           ASSETS
  Current assets:
     Cash, cash equivalents and short-term investments............    $  9,597       $ 12,736
     Accounts receivable, net.....................................      11,963         12,241
     Inventories..................................................       3,892          3,861
     Other current assets.........................................       4,309          3,305
                                                                    ------------     --------
          Total current assets....................................      29,761         32,143
 
  Property and equipment, net.....................................      16,709         17,108
  Intangible assets...............................................       2,257          2,243
  Investment in Target Therapeutics, Inc. ........................      18,240         17,499
  Other investments and assets....................................       6,759          5,512
                                                                    ------------     --------
                                                                      $ 73,726       $ 74,505
                                                                    ===========      =========
 
                             LIABILITIES AND STOCKHOLDERS EQUITY
  Current liabilities:
     Accounts payable.............................................    $  1,487       $  1,420
     Accrued liabilities..........................................       9,415         10,245
     Income taxes payable.........................................       5,279          4,251
                                                                    ------------     --------
          Total current liabilities...............................      16,181         15,916
  Long-term liabilities:
     Deferred income taxes........................................       8,240          8,240
     Other long-term liabilities..................................       1,433          1,267
  Stockholders' equity:
     Preferred stock, $.01 par value, authorized 5,000,000 shares;
       none issued and outstanding................................          --             --
     Common stock, $.01 par value, authorized 28,950,000 shares;
       issued 10,466,346 shares at December 31, 1994 (10,354,633
      shares at June 30, 1994)....................................         105            104
     Additional paid-in capital...................................      62,837         61,172
     Retained earnings............................................      12,740          9,882
     Cumulative translation adjustment............................        (839)          (648)
     Treasury stock, at cost, 1,200,000 shares at December 31,
      1994 (937,500 shares at June 30, 1994)......................     (26,971)       (21,428)
                                                                    ------------     --------
          Total stockholders' equity..............................      47,872         49,082
                                                                    ------------     --------
                                                                      $ 73,726       $ 74,505
                                                                    ===========      =========
</TABLE>
 
                            See accompanying notes.
 
                                      F-17
<PAGE>   105
 
                              COLLAGEN CORPORATION
 
                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                  (UNAUDITED)
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                          SIX MONTHS ENDED
                                                                            DECEMBER 31,
                                                                         -------------------
                                                                          1994        1993
                                                                         -------     -------
<S>                                                                      <C>         <C>
Revenues:
  Product sales........................................................  $34,302     $30,238
  Other................................................................    1,000       1,000
                                                                         -------     -------
                                                                          35,302      31,238
                                                                         -------     -------
Costs and expenses:
  Cost of sales........................................................    9,216       8,590
  Research & development...............................................    5,038       4,565
  Selling, general & administrative....................................   15,331      14,292
                                                                         -------     -------
                                                                          29,585      27,447
                                                                         -------     -------
Income from operations.................................................    5,717       3,791
Other income (expense):
  Gain on sale of stock of Target Therapeutics, Inc....................      775          --
  Equity in earnings (losses) of affiliates, net.......................     (369)        (37)
  Interest income......................................................      215         283
  Interest expense.....................................................      (55)         --
                                                                         -------     -------
Income before income taxes.............................................    6,283       4,037
Provision for income taxes.............................................    2,731       2,000
                                                                         -------     -------
Net income.............................................................  $ 3,552     $ 2,037
                                                                         ========    ========
Net income per share...................................................  $   .37     $   .20
                                                                         ========    ========
Shares used in calculating per share information.......................    9,517      10,031
                                                                         ========    ========
</TABLE>
 
                             See accompanying notes
 
                                      F-18
<PAGE>   106
 
                              COLLAGEN CORPORATION
 
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                          SIX MONTHS ENDED
                                                                            DECEMBER 31,
                                                                         -------------------
                                                                          1994        1993
                                                                         -------     -------
<S>                                                                      <C>         <C>
Cash flows from operating activities:
  Net income...........................................................  $ 3,552     $ 2,037
  Adjustments to reconcile net income to cash provided by operating
     activities:
     Depreciation and amortization.....................................    1,954       1,838
     Gain on sale of stock of Target Therapeutics, Inc.................     (775)         --
     Other adjustments related to changes in assets and liabilities....     (842)      1,091
                                                                         -------     -------
          Net cash provided by operating activities....................    3,889       4,966
                                                                         -------     -------
 
Cash flows from investing activities:
  Proceeds from sales and maturities of short-term investments.........    4,903      11,275
  Purchases of short-term investments..................................       --      (7,413)
  Net proceeds from sale of stock of Target Therapeutics, Inc..........    1,102          --
  Increase in long-term investments, intangible and other assets.......   (2,870)       (505)
  Expenditures for property and equipment..............................   (1,383)     (2,086)
                                                                         -------     -------
          Net cash provided by investing activities....................    1,752       1,271
                                                                         -------     -------
 
Cash flows from financing activities:
  Repurchase of common stock...........................................   (5,543)     (9,986)
  Net proceeds from issuance of common stock...........................    1,666       1,837
                                                                         -------     -------
          Net cash used in financing activities........................   (3,877)     (8,149)
                                                                         -------     -------
 
Net increase (decrease) in cash and cash equivalents...................    1,764      (1,912)
Cash and cash equivalents at beginning of period.......................    5,369       9,294
                                                                         -------     -------
Cash and cash equivalents at end of period.............................  $ 7,133     $ 7,382
                                                                         ========    ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-19
<PAGE>   107
 
                              COLLAGEN CORPORATION
 
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     The condensed consolidated financial statements include the accounts of
Collagen Corporation ("the Company"), a Delaware corporation, and its
wholly-owned and majority-owned subsidiaries. All significant intercompany
accounts and transactions have been eliminated.
 
     The condensed consolidated balance sheet as of December 31, 1994, and the
condensed consolidated statements of income and cash flows for the six months
ended December 31, 1994 and 1993, have been prepared by the Company, without
audit. In the opinion of management, all adjustments (which include only normal
recurring adjustments) necessary to present fairly the financial position,
results of operations and cash flows at December 31, 1994 and for all periods
presented have been made. Interim results are not necessarily indicative of
results for a full fiscal year. The condensed consolidated balance sheet as of
June 30, 1994 has been derived from the audited consolidated financial
statements at that date.
 
     Certain information and footnote disclosures normally included in financial
statements prepared in accordance with generally accepted accounting principles
have been condensed or omitted. These condensed consolidated financial
statements should be read in conjunction with the audited consolidated financial
statements and notes thereto for the year ended June 30, 1994 included elsewhere
herein.
 
  Cash, Cash Equivalents and Short-term Investments
 
     Effective July 1, 1994, the Company adopted Statement of Financial
Accounting Standards No. 115 ("FAS 115"), "Accounting for Certain Investments in
Debt and Equity Securities." In accordance with FAS 115, prior period financial
statements have not been restated to reflect the change in accounting principle.
The impact of adoption at July 1, 1994 was immaterial. The Company's debt
securities are classified as available-for-sale and are carried at fair value in
cash equivalents and short-term investments. Unrealized gains and losses, net of
tax, are included in stockholders' equity and were immaterial for the six months
ended December 31, 1994.
 
2. INVENTORIES
 
     Inventories consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31, 1994     JUNE 30, 1994
                                                          -----------------     -------------
    <S>                                                   <C>                   <C>
    Raw materials.......................................       $   502             $   625
    Work-in-process.....................................         1,554               1,763
    Finished goods......................................         1,836               1,473
                                                              --------          -------------
                                                               $ 3,892             $ 3,861
                                                          ================      ===========
</TABLE>
 
                                      F-20
<PAGE>   108
 
                              COLLAGEN CORPORATION
 
      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
3. PER SHARE INFORMATION
 
     Earnings per share for the six months ended December 31, 1994 and 1993 have
been computed based upon the weighted average number of common and common
equivalent shares outstanding. Shares used in the per share computations are as
follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                       SIX MONTHS ENDED
                                                                         DECEMBER 31,
                                                                     ---------------------
                                                                       1994         1993
                                                                     --------     --------
<S>                                                                  <C>          <C>
Primary
  Common stock...................................................      9,336        9,669
  Stock options..................................................        181          362
                                                                     --------     --------
Weighted average number of common and common equivalent shares
  outstanding....................................................      9,517       10,031
                                                                     ==========   ==========
</TABLE>
 
4. INCOME TAXES
 
     The provision for income taxes for the six months ended December 31, 1994
and 1993 was computed by applying the estimated annual income tax rates of
approximately 43% and approximately 49%, respectively, to income before income
taxes. The lower effective tax rate in the current fiscal year is primarily due
to increased equity in losses of affiliates which is partially offset by a
change in the mix of anticipated foreign and domestic earnings and a lower
effective state income tax rate.
 
5. STOCK REPURCHASE PROGRAM
 
     In February 1993, the Company's Board of Directors authorized a stock
repurchase program. During the three months ended December 31, 1994, the Company
repurchased 172,000 shares of its common stock at an average acquisition price
of approximately $22 per share. Since the inception of the stock repurchase
program in February 1993, the Company has repurchased 1,200,000 shares of its
common stock at an average acquisition price of approximately $22 per share. As
of January 25, 1995, the Company is authorized to repurchase an additional
300,000 shares in the open market under the program. The Company currently plans
to keep the repurchased shares as treasury stock and may use this stock in
various company stock benefit plans.
 
6. SALE OF TARGET COMMON STOCK
 
     In November 1994, the Company sold 35,000 shares of the common stock of
Target Therapeutics, Inc. ("Target") for a pre-tax gain of approximately
$775,000. After the sale, the Company's ownership position in Target was reduced
from approximately 33% to approximately 32%.
 
     Target's common stock is quoted on the Nasdaq National Market. The closing
price of Target's stock at December 30, 1994 was $28.25 per share. The Company
held 2,259,194 shares of Target's common stock at December 30, 1994.
 
                                      F-21
<PAGE>   109
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Target Therapeutics, Inc.
 
We have audited the accompanying consolidated balance sheets of Target
Therapeutics, Inc. as of March 31, 1994 and 1993, and the related consolidated
statements of income, stockholders' equity and cash flows for each of the three
years in the period ended March 31, 1994. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the consolidated financial position of Target
Therapeutics, Inc. at March 31, 1994 and 1993, and the consolidated results of
its operations and its cash flows for each of the three years in the period
ended March 31, 1994, in conformity with generally accepted accounting
principles.
 
As discussed in Notes 1 and 6 to the consolidated financial statements, in 1994
the Company changed its method of accounting for income taxes.
 
                                          ERNST & YOUNG LLP
Palo Alto, California
April 27, 1994
 
                                      F-22
<PAGE>   110
 
                           TARGET THERAPEUTICS, INC.
 
                          CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                              MARCH 31,
                                                                         -------------------
                                                                          1994        1993
                                                                         -------     -------
<S>                                                                      <C>         <C>
ASSETS
Current assets:
  Cash, cash equivalents and short-term investments....................  $37,673     $31,487
  Accounts receivable..................................................    6,426       5,925
  Inventories..........................................................    2,987       3,593
  Deferred tax assets..................................................    2,094          --
  Other current assets.................................................      289         578
                                                                         -------     -------
          Total current assets.........................................   49,469      41,583
Property and equipment, net............................................    4,688       4,114
Other assets...........................................................    2,973       1,130
                                                                         -------     -------
                                                                         $57,130     $46,827
                                                                         ========    ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable.....................................................  $ 1,454     $   870
  Accrued compensation.................................................    2,152       1,771
  Taxes payable........................................................      672          11
  Accrued product replacement costs....................................    1,141          --
  Other accrued liabilities............................................    1,925       1,561
  Deferred tax liabilities.............................................      598          --
                                                                         -------     -------
          Total current liabilities....................................    7,942       4,213
Long-term obligations..................................................      124         152
Commitments and contingencies
Stockholders' equity:
  Preferred stock, $.001 par value (shares authorized: 2,000,000;
     issued and outstanding: none).....................................       --          --
  Common stock, $.0025 par value (shares authorized: 25,000,000;
     issued and outstanding: 7,024,619 and 6,756,355 at March 31,
     1994 and 1993, respectively)......................................       18          17
  Additional paid-in capital...........................................   40,593      39,020
  Deferred compensation................................................     (124)       (232)
  Retained earnings....................................................    8,608       3,657
  Notes receivable from stockholders...................................      (31)         --
                                                                         -------     -------
          Total stockholders' equity...................................   49,064      42,462
                                                                         -------     -------
                                                                         $57,130     $46,827
                                                                         ========    ========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-23
<PAGE>   111
 
                           TARGET THERAPEUTICS, INC.
 
                       CONSOLIDATED STATEMENTS OF INCOME
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                   YEARS ENDED MARCH 31,
                                                              -------------------------------
                                                               1994        1993        1992
                                                              -------     -------     -------
<S>                                                           <C>         <C>         <C>
Revenues:
  Product sales.............................................  $35,353     $28,117     $19,049
  Revenues from research partner............................       --          --       1,400
                                                              -------     -------     -------
          Total revenues....................................   35,353      28,117      20,449
Costs and expenses:
  Cost of sales.............................................   13,368       9,657       6,920
  Research and development..................................    7,624       6,496       4,347
  Selling, general and administrative.......................    9,245       7,543       5,447
                                                              -------     -------     -------
          Total costs and expenses..........................   30,237      23,696      16,714
                                                              -------     -------     -------
Income from operations......................................    5,116       4,421       3,735
Interest income, net........................................      954         890         297
Other income................................................      515          16          --
                                                              -------     -------     -------
Income before income taxes and cumulative effect of
  change in method of accounting for income taxes...........    6,585       5,327       4,032
Provision for income taxes..................................    2,265       1,747       1,532
                                                              -------     -------     -------
Income before cumulative effect of accounting change........    4,320       3,580       2,500
Cumulative effect of change in method of accounting for
  income taxes..............................................      631          --          --
                                                              -------     -------     -------
Net income..................................................  $ 4,951     $ 3,580     $ 2,500
                                                              ========    ========    ========
Income per share:
  Income before cumulative effect of accounting change......  $   .61     $   .51
  Cumulative effect of change in method of accounting for
     income taxes...........................................      .09          --
                                                              -------     -------
  Net income per share......................................  $   .70     $   .51
                                                              ========    ========
Pro forma information (unaudited):
  Historical income before income taxes.....................                          $ 4,032
  Pro forma provision for income taxes......................                            1,433
                                                                                      -------
  Pro forma net income......................................                          $ 2,599
                                                                                      ========
  Pro forma net income per share............................                          $   .51
                                                                                      ========
Shares used in computing income per share and pro forma net
  income per share data.....................................    7,103       7,075       5,093
                                                              ========    ========    ========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-24
<PAGE>   112
 
                           TARGET THERAPEUTICS, INC.
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                               RETAINED       NOTES
                                                   ADDITIONAL                  EARNINGS    RECEIVABLE      TOTAL
                                PREFERRED  COMMON   PAID-IN      DEFERRED    (ACCUMULATED     FROM      STOCKHOLDERS'
                                  STOCK    STOCK    CAPITAL    COMPENSATION    DEFICIT)    STOCKHOLDERS    EQUITY
                                ---------  ------  ----------  ------------  ------------  -----------  ------------
<S>                             <C>        <C>     <C>         <C>           <C>           <C>          <C>
Balances at March 31, 1991.....  $ 6,977    $ 66    $     --      $   --       $ (2,423)      $ (42)      $  4,578
Recapitalization of common
  stock pursuant to
  reincorporation in the State
  of Delaware..................   (6,967)    (65)      7,032          --             --          --             --
Dividend paid to preferred
  stockholders.................       --      --      (7,005)         --             --          --         (7,005)
Conversion of 9,596,010 shares
  of preferred stock to
  3,838,404 shares of common
  stock........................      (10)     10          --          --             --          --             --
Issuance of 2,308,500 shares of
  common stock in connection
  with initial public offering,
  net of issuance costs of
  $3,651.......................       --       6      37,790          --             --          --         37,796
Exercise of common stock
  options (45,676 shares), net
  of notes receivable..........       --      --          17          --             --          18             35
Deferred compensation related
  to the grant of certain stock
  options......................       --      --         419        (419)            --          --             --
Amortization of deferred
  compensation.................       --      --          --          79             --          --             79
Net income.....................       --      --          --          --          2,500          --          2,500
                                ---------  ------  ----------     ------     ------------     -----     ------------
Balances at March 31, 1992.....       --      17      38,253        (340)            77         (24)        37,983
Exercise of common stock
  options (190,195 shares), net
  of notes receivable..........       --      --         101          --             --          24            125
Amortization of deferred
  compensation.................       --      --          --         108             --          --            108
Income tax benefit of
  disqualifying dispositions...       --      --         666          --             --          --            666
Net income.....................       --      --          --          --          3,580          --          3,580
                                ---------  ------  ----------     ------     ------------     -----     ------------
Balances at March 31, 1993.....       --      17      39,020        (232)         3,657          --         42,462
Exercise of common stock
  options and issuance under
  stock purchase plan (268,264
  shares), net of notes
  receivable...................       --       1         687          --             --         (31)           657
Amortization of deferred
  compensation.................       --      --          --         108             --          --            108
Income tax benefit of
  disqualifying dispositions...       --      --         886          --             --          --            886
Net income.....................       --      --          --          --          4,951          --          4,951
                                ---------  ------  ----------     ------     ------------     -----     ------------
Balances at March 31, 1994.....  $    --    $ 18    $ 40,593      $ (124)      $  8,608       $ (31)      $ 49,064
                                ========== ========= =========== ============== ============== ============ =============
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-25
<PAGE>   113
 
                           TARGET THERAPEUTICS, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED MARCH 31,
                                                          ----------------------------------
                                                            1994         1993         1992
                                                          --------     --------     --------
<S>                                                       <C>          <C>          <C>
Cash flows from operating activities:
  Net income............................................  $  4,951     $  3,580     $  2,500
  Adjustments to reconcile net income to net cash
     provided by operations:
       Depreciation and amortization....................     1,524        1,135          887
       Changes in assets and liabilities:
          Accounts receivable...........................      (501)      (1,826)      (1,615)
          Inventories...................................       606       (1,247)        (669)
          Deferred tax assets...........................    (2,094)          --           --
          Other current assets..........................       289          117         (583)
          Accounts payable..............................       584         (188)         472
          Accrued compensation..........................       381          567          686
          Taxes payable.................................       661          544          124
          Accrued product replacement costs.............     1,141           --           --
          Other accrued liabilities.....................       384         (158)         453
          Deferred tax liabilities......................       598           --           --
          Payable to Collagen Corporation...............        --         (180)        (600)
          Accrued facility lease costs..................        --         (330)         330
          Income tax benefit of disqualifying
            dispositions................................       886          666           --
                                                          --------     --------     --------
            Total adjustments...........................     4,459         (900)        (515)
                                                          --------     --------     --------
  Net cash provided by operating activities.............     9,410        2,680        1,985
                                                          --------     --------     --------
Cash flows used in investing activities:
     Capital expenditures, net..........................    (1,938)      (2,205)      (1,700)
     Purchase of short-term investments.................   (65,266)     (95,371)     (12,970)
     Sale of short-term investments.....................    62,782       81,831           --
     Increase in other assets...........................    (1,895)        (515)        (388)
                                                          --------     --------     --------
  Net cash used in investing activities.................    (6,317)     (16,260)     (15,058)
                                                          --------     --------     --------
Cash flows from financing activities:
     Increase in note payable to bank...................        --           --          500
     Payments of note payable to bank...................        --           --         (500)
     Issuance of common stock for cash..................       657          101       37,813
     Principal payments under capital leases............       (48)         (42)         (26)
     Decrease in notes receivable from stockholders.....        --           24           18
     Dividends paid to preferred stockholders...........        --           --       (7,005)
                                                          --------     --------     --------
  Net cash provided by financing activities.............       609           83       30,800
                                                          --------     --------     --------
Net increase (decrease) in cash and cash equivalents....     3,702      (13,497)      17,727
Cash and cash equivalents, beginning of year............     4,977       18,474          747
                                                          --------     --------     --------
Cash and cash equivalents, end of year..................  $  8,679     $  4,977     $ 18,474
                                                          =========    =========    =========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-26
<PAGE>   114
 
                           TARGET THERAPEUTICS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     Description of Business  Target Therapeutics, Inc. (the "Company" or
"Target") was incorporated in California in June 1985 and reincorporated in the
State of Delaware in January 1992. The Company is in the business of developing,
manufacturing and marketing disposable medical devices used in minimally
invasive procedures to treat vascular diseases of the brain associated with
stroke and other diseases accessible through small vessels of the circulatory
system.
 
     Principles of consolidation  The consolidated financial statements include
the accounts of the Company and its wholly-owned subsidiaries. All significant
intercompany accounts and transactions have been eliminated. Investments in
unconsolidated subsidiaries, jointly owned companies and other investments in
which the Company has a 20 to 50 percent interest are accounted for on the
equity method.
 
     Cash equivalents and short-term investments  Cash equivalents consist of
highly liquid investments, primarily money market accounts, with maturities at
the date of purchase of 90 days or less. Short-term investments consist
primarily of money auction preferred stock and government securities which are
stated at cost which approximates market.
 
     In May 1993, the Financial Accounting Standards Board ("FASB") issued
Statement 115, "Accounting for Certain Investments in Debt and Equity
Securities." Under the rules of Statement 115, debt and equity investments must
be classified as either held-to-maturity, available-for-sale or trading.
Unrealized gains and losses for available-for-sale and trading securities are
reported in retained earnings or current period earnings, respectively. The
Company will adopt Statement 115 in the first quarter of its fiscal year ending
March 31, 1995 and does not expect a material adverse effect on its financial
statements.
 
     Concentration of credit risk  The Company sells its products primarily to
physicians and hospitals in North America, Europe and Asia. The Company performs
ongoing credit evaluations of its customers and generally does not require
collateral. The Company maintains reserves for potential credit losses. See Note
7 for discussion of export sales and major customers.
 
     The Company invests its excess cash in deposits and foreign and corporate
debt securities. These securities typically mature within 360 days and,
therefore, bear minimal risk. The Company has not experienced any material
losses on its investments.
 
     Income taxes  In February 1992, the FASB issued Statement 109, "Accounting
for Income Taxes." Effective April 1, 1993, the Company adopted Statement 109
under which the liability method is used in accounting for income taxes. As
permitted by Statement 109, the Company has elected to report the cumulative
effect of the change in the current period rather than restate the financial
statements of prior years. The cumulative positive effect of the change in
method of accounting for income taxes increased net income by $631,000, or $.09
per share, for the year ended March 31, 1994.
 
     Net income per share  Except as noted below, historical net income per
share is computed using the weighted average number of common and dilutive
common equivalent shares outstanding. Pursuant to the Securities and Exchange
Commission Staff Accounting Bulletins, common and common equivalent shares
issued at prices below the public offering price during the 12-month period
prior to the Company's initial public offering in January 1992 have been
included in the calculation as if they were outstanding for all periods prior to
the offering (using the treasury stock method and the initial public offering
price per share). Furthermore, pursuant to Staff policy, common equivalent
shares from convertible preferred stock that automatically converted upon the
 
                                      F-27
<PAGE>   115
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)
completion of the Company's initial public offering are included in the
calculation using the as-if converted method from the original date of issuance.
Historical net income per share was $.49 (based on 5,093,000 shares) for the
year ended March 31, 1992.
 
     In accordance with Staff Accounting Bulletin No. 55, the Company has
presented unaudited pro forma net income per share information for the year
ended March 31, 1992 in the accompanying Consolidated Statements of Income,
assuming the Company did not have a tax allocation agreement with Collagen
Corporation ("Collagen") and filed its tax returns on a separate company basis.
See Note 6 for further discussion.
 
     Inventories  Inventories are stated at the lower of cost or market. Cost is
determined using standard costs, which approximate actual costs, under the
first-in, first-out method.
 
     Property and equipment  Property and equipment are stated at cost, net of
accumulated depreciation and amortization. Depreciation and amortization are
provided using the straight-line method over the estimated useful lives of the
respective assets, ranging from three to five years. Leasehold improvements are
amortized on a straight-line basis over five years or the remaining lease term,
whichever is shorter.
 
     Patents and trademarks  Patents and trademarks are stated at cost, net of
accumulated amortization. Amortization is provided using the straight-line
method over a seven-year life beginning with the effective dates or over the
remainder of such periods from the dates acquired.
 
     Revenue recognition  Product sales are recognized upon shipment. Revenues
earned under research and development agreements are recorded when earned as
defined in the specific agreements.
 
     Reclassification  Certain amounts in the prior year financial statements
have been reclassified to conform to the current year presentation.
 
2. BALANCE SHEET INFORMATION
 
<TABLE>
<CAPTION>
                                                                          MARCH 31,
                                                                     -------------------
                                                                      1994        1994
                                                                     -------     -------
                                                                       (IN THOUSANDS)
    <S>                                                              <C>         <C>
    Cash, cash equivalents and short-term investments:
      Cash and cash equivalents....................................  $ 8,679     $ 4,977
      Short-term investments.......................................   28,994      26,510
                                                                     -------     -------
                                                                     $37,673     $31,487
                                                                     ========    ========
    Accounts receivable:
      Trade receivables............................................  $ 6,840     $ 6,322
      Less allowance for doubtful accounts.........................     (414)       (397)
                                                                     -------     -------
                                                                     $ 6,426     $ 5,925
                                                                     ========    ========
    Inventories:
      Raw materials................................................  $   531     $   646
      Work-in-process..............................................    1,152         810
      Finished goods...............................................    1,304       2,137
                                                                     -------     -------
                                                                     $ 2,987     $ 3,593
                                                                     ========    ========
    Property and equipment:
      Machinery and equipment......................................  $ 5,275     $ 4,115
      Office equipment.............................................    2,495       2,078
      Leasehold improvements.......................................      495         437
                                                                     -------     -------
                                                                       8,265       6,630
      Less accumulated depreciation and amortization...............   (3,577)     (2,516)
                                                                     -------     -------
                                                                     $ 4,688     $ 4,114
                                                                     ========    ========
</TABLE>
 
                                      F-28
<PAGE>   116
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
3. EXPECTED COSTS OF PRODUCT REPLACEMENT
 
     In October 1993, the Company announced that it is pursuing certain changes
to a product currently sold under an investigational device exemption ("IDE") by
the U.S. Food and Drug Administration ("FDA"). Pursuant to a supplement to the
IDE which was approved by the FDA in March 1994, limited FDA clinical trials of
the modified product were commenced in April 1994. As treatment sites are
converted to the modified product, the Company expects to exchange such modified
product for any original product that customers still have in their inventory.
The Company has provided $1.5 million, which was included in cost of sales in
fiscal 1994, for the estimated costs of such exchange including the disposition
of the Company's inventory of such product.
 
4. COMMITMENTS
 
  Line of credit arrangement
 
     The Company maintains a $2.0 million revolving line of credit with a bank
which expires in July 1994. Borrowings under the line of credit bear interest at
the bank's prime rate (6.25 percent at March 31, 1994), are unsecured and are
subject to certain covenants related to financial ratios and profits. There were
no amounts outstanding under this line at March 31, 1994.
 
  Lease obligations
 
     The Company leases its facilities and certain equipment under operating
leases. The Company recognizes rent expense on a straight-line basis over the
lease term. The future minimum lease commitments by fiscal year as of March 31,
1994 are as follows (in thousands):
 
<TABLE>
            <S>                                                           <C>
            1995........................................................  $   831
            1996........................................................      821
            1997........................................................      823
            1998........................................................      877
            1999........................................................      872
            Thereafter..................................................    1,665
                                                                          -------
                                                                          $ 5,889
                                                                           ======
</TABLE>
 
     The following schedule shows the composition of net rental expense for all
operating leases (in thousands):
 
<TABLE>
<CAPTION>
                                                                  YEARS ENDED MARCH 31,
                                                                 ------------------------
                                                                 1994      1993      1992
                                                                 ----     ------     ----
    <S>                                                          <C>      <C>        <C>
    Rent expense...............................................  $914     $1,146     $901
    Less sublease rental income................................   (77)       (88)      --
                                                                 ----     ------     ----
                                                                 $837     $1,058     $901
                                                                 =====    ======     =====
</TABLE>
 
5. STOCKHOLDERS' EQUITY
 
  Stock option and purchase plans
 
     The 1988 Stock Option Plan (the "Plan") is an incentive and nonstatutory
option plan providing for the issuance of common stock to employees, officers,
directors and consultants of the Company. At March 31, 1994 the Company had
reserved 1,700,000 shares of common stock for issuance under the Plan. Options
granted generally become exercisable over a 48-month period. Under the Plan, the
exercise price of incentive options may not be less than 100 percent of the fair
 
                                      F-29
<PAGE>   117
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
5. STOCKHOLDERS' EQUITY -- (CONTINUED)
market value at the date of grant, and the exercise price of nonstatutory
options must be at least 85 percent of the fair market value at the date of
grant. In the case of an option holder who owns more than ten percent of the
voting power of all outstanding stock, the incentive option exercise price must
be at least 110 percent of fair market value and the option must be exercised
within five years of the grant date.
 
     The Company has recorded $419,000 in deferred compensation expense for the
difference between the grant price and the deemed fair value for financial
statement presentation purposes of the Company's common stock for certain
options granted in fiscal 1992. Amortization of deferred compensation was
$108,000 in each of the years ended March 31, 1994 and 1993 and $79,000 in the
year ended March 31, 1992. The deferred compensation amount is being amortized
over a four-year period.
 
     Information with respect to the 1988 Stock Option Plan is summarized as
follows:
 
<TABLE>
<CAPTION>
                                                                OPTIONS OUTSTANDING
                                          SHARES      ----------------------------------------
                                         AVAILABLE     NUMBER
                                           FOR           OF        AGGREGATE         PRICE
                                          GRANT        SHARES        PRICE         PER SHARE
                                         --------     --------     ----------     ------------
<S>                                      <C>          <C>          <C>            <C>
Balances at March 31, 1991.............   189,740      469,440     $  142,771     $   .13-1.25
Additional shares reserved.............   200,000           --             --               --
Options granted........................  (142,506)     142,506        828,490       2.50-11.50
Options exercised......................        --      (45,676)       (16,968)        .13-8.75
Options canceled.......................    14,451      (14,451)        (8,801)        .13-8.75
                                         --------     --------     ----------     ------------
Balances at March 31, 1992.............   261,685      551,819        945,492        .13-11.50
Additional shares reserved.............   500,000           --             --               --
Options granted........................  (111,160)     111,160      2,227,063      17.75-26.75
Options exercised......................        --     (190,195)      (100,566)       .13-17.75
Options canceled.......................    14,673      (14,673)      (134,309)       .13-26.00
                                         --------     --------     ----------     ------------
Balances at March 31, 1993.............   665,198      458,111      2,937,680        .13-26.75
Options granted........................  (302,875)     302,875      6,035,300      17.25-24.25
Options exercised......................        --     (252,113)      (416,980)       .13-25.63
Options canceled.......................    28,514      (28,514)      (425,976)       .33-26.00
                                         --------     --------     ----------     ------------
Balances at March 31, 1994.............   390,837      480,359     $8,130,024     $  .13-26.75
                                         =========    =========    ==========     ============
</TABLE>
 
     As of March 31, 1994, options for 134,361 shares were exercisable.
 
     In December 1991, the Company's Board of Directors (the "Board") adopted
the 1991 Director Option Plan ("Director Option Plan"). A total of 100,000
shares of common stock have been reserved for issuance under the Director Option
Plan which provides for the grant of nonstatutory options to non employee
directors of the Company. As of March 31, 1994, options to purchase 22,000
shares under this plan were outstanding and become exercisable over a three year
period from the grant date. As of March 31, 1994, options for 3,334 shares were
exercisable. No options under the Director Option Plan have been exercised.
 
     The Board also adopted the 1991 Employee Stock Purchase Plan (the "Purchase
Plan") in December 1991. The Purchase Plan allows for the issuance of up to
100,000 shares of common stock to employees of the Company. During the year
ended March 31, 1994, 16,151 shares were issued at prices ranging from $15.09 to
$18.70 per share under the Purchase Plan.
 
                                      F-30
<PAGE>   118
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. INCOME TAXES
 
     The Company's provision for income taxes for the years ended March 31,
1994, 1993 and 1992 consists of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED MARCH 31,
                                                             ----------------------------
                                                              1994       1993       1992
                                                             ------     ------     ------
    <S>                                                      <C>        <C>        <C>
    Current:
      Federal..............................................  $2,353     $1,374     $1,398
      State................................................     674        466        422
                                                             ------     ------     ------
              Total current................................   3,027      1,840      1,820
    Deferred:
      Federal..............................................    (614)      (101)      (238)
      State................................................    (148)         8        (50)
                                                             ------     ------     ------
              Total deferred...............................    (762)       (93)      (288)
                                                             ------     ------     ------
    Total provision........................................  $2,265     $1,747     $1,532
                                                             ======     ======     ======
</TABLE>
 
     For the period from February 1, 1992 through March 31, 1992, and for the
years ended March 31, 1994 and 1993, the Company calculates its federal, foreign
sales corporation and California state tax provisions on a separate company
basis and files federal income tax returns on a separate company basis. Collagen
was the majority stockholder of the Company until November 1992 when it sold
shares that resulted in a decrease in its percentage ownership to approximately
34 percent. For the period April 1, 1991 through January 31, 1992, prior to
Target's initial public offering, Target's taxable income was included in
Collagen's consolidated federal income tax returns. For the period April 1, 1991
through June 30, 1992, Target was included in Collagen's combined California tax
returns. For periods prior to February 1, 1992, the Company's tax provisions and
tax liabilities were calculated in accordance with the Tax Allocation Agreements
that existed between Collagen and Target. Such provision may not reflect the
Company's actual tax rate had it not been consolidated with Collagen for tax
purposes.
 
     At March 31, 1994, the Company had available net operating loss
carryforwards for tax purposes of approximately $1.1 million which expire in the
year 2001. Because of the "change in ownership" provisions of the Tax Reform Act
of 1986, the loss carryforwards will be subject to an annual limitation
regarding their utilization against future taxable income.
 
     The Company realizes tax benefits as a result of the exercise and
subsequent sale of certain employee stock options (disqualifying dispositions).
For financial reporting purposes, any reduction in income tax obligations as a
result of these tax benefits, $886,000 and $666,000 in fiscal 1994 and 1993,
respectively, is credited to additional paid-in capital.
 
                                      F-31
<PAGE>   119
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. INCOME TAXES -- (CONTINUED)
     The provision for income taxes for the years ended March 31, 1994 and 1993
and the unaudited pro forma provision for income taxes for the year ended March
31, 1992 differ from the amount computed by applying the statutory federal
income tax rate to income before taxes. The reconciliation between the federal
statutory rate and the effective tax rate is as follows:
 
<TABLE>
<CAPTION>
                                                                     YEARS ENDED MARCH 31,
                                                                     ----------------------
                                                                     1994     1993     1992
                                                                     ----     ----     ----
    <S>                                                              <C>      <C>      <C>
    Statutory federal income tax rate.............................   34.0%    34.0%    34.0%
    Foreign sales corporation tax benefit.........................   (3.7)    (3.3)    (3.2)
    State income taxes............................................    5.3      5.9      5.8
    Tax exempt interest...........................................   (2.6)    (2.9)      --
    Other.........................................................    1.4     (0.9)    (1.1)
                                                                     ----     ----     ----
      Provision for income taxes..................................   34.4%    32.8%
                                                                     ====     ====
      Unaudited pro forma provision for income taxes..............                     35.5%
                                                                                       ====
</TABLE>
 
     Deferred taxes for the year ended March 31, 1994 reflect the net tax
effects of loss carryforwards and temporary differences between the carrying
amounts of assets and liabilities for financial reporting purposes and the
amounts used for income tax purposes. Significant amounts of the Company's
deferred tax assets and liabilities as of March 31, 1994 are as follows (in
thousands):
 
<TABLE>
<CAPTION>
                                                                             YEAR ENDED
                                                                              MARCH 31,
                                                                                1994
                                                                            -------------
    <S>                                                                     <C>
    Deferred tax assets:
      Inventory valuation accounts........................................
                                                                               $   382
      Reserves and accruals not currently tax deductible..................
                                                                                 1,439
      Benefit of net operating loss carryforwards.........................
                                                                                   546
      State income tax....................................................
                                                                                   159
      Other...............................................................
                                                                                    58
                                                                            -------------
                                                                                 2,584
      Valuation allowance.................................................
                                                                                  (490)
                                                                            -------------
                                                                               $ 2,094
                                                                            ============
    Deferred tax liabilities:
      Patent costs........................................................
                                                                               $   328
      Depreciation........................................................
                                                                                   128
      Accrued cost of exchanging GDC inventory............................
                                                                                   142
                                                                            -------------
                                                                               $   598
                                                                            ============
</TABLE>
 
                                      F-32
<PAGE>   120
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. INCOME TAXES -- (CONTINUED)
     The components of the credit for deferred income taxes for the years ended
March 31, 1993 and 1992 under the deferred method are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                     YEARS ENDED MARCH
                                                                            31,
                                                                    -------------------
                                                                    1993          1992
                                                                    -----         -----
    <S>                                                             <C>           <C>
    Depreciation..................................................  $  98         $ (26)
    Accounts receivable and sales return reserves.................    (51)          (52)
    Patent expenses...............................................    132            64
    Accrued vacation and commissions..............................    (44)          (35)
    State taxes...................................................   (129)          (56)
    Inventory valuation...........................................    (80)          (20)
    Accrued expenses..............................................    (49)         (163)
    Other.........................................................     30            --
                                                                    -----         -----
              Total deferred provision............................  $ (93)        $(288)
                                                                    ======        ======
</TABLE>
 
     For the ten-month period ended January 31, 1992 there were no deferred or
prepaid taxes due to the Tax Allocation Agreements in effect between the Company
and Collagen.
 
7. EXPORT SALES AND MAJOR CUSTOMERS
 
     The Company markets its products both domestically and internationally.
Export product sales are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                               YEARS ENDED MARCH 31,
                                                          -------------------------------
                                                           1994        1993        1992
                                                          -------     -------     -------
    <S>                                                   <C>         <C>         <C>
    Europe..............................................  $ 8,651     $ 7,883     $ 4,591
    Asia................................................   11,019       8,275       5,269
    Other...............................................    1,469       1,086         759
                                                          -------     -------     -------
                                                          $21,139     $17,244     $10,619
                                                          ========    ========    ========
</TABLE>
 
     One customer accounted for approximately 29 percent and 27 percent of the
Company's product sales for the years ended March 31, 1994 and 1993,
respectively. Another customer accounted for approximately 21 percent of the
Company's product sales for the year ended March 31, 1992.
 
8. SUPPLEMENTAL CASH FLOW INFORMATION
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED MARCH 31,
                                                             ----------------------------
                                                              1994       1993       1992
                                                             ------     ------     ------
                                                                    (IN THOUSANDS)
    <S>                                                      <C>        <C>        <C>
    Supplemental disclosure of cash flow information:
      Cash paid during the period for income taxes.........  $1,573     $1,195     $2,254
      Cash paid during the period for interest.............      40         19         13
    Supplemental schedule of noncash investing and
      financing
      activities:
      Deferred compensation related to issuance of stock
         options...........................................  $   --     $   --     $  419
      Acquisition of assets under capital lease............      --         32         93
      Issuance of common stock options in exchange for a
         note receivable...................................      31         --         --
</TABLE>
 
                                      F-33
<PAGE>   121
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
9. JOINT VENTURE AND RELATED AGREEMENTS
 
     In September 1991, the Company entered into a joint venture agreement with
Century Medical Inc. ("CMI"), a Japanese corporation, to distribute the
Company's products in Japan. CMI initially contributed approximately $200,000
for a 100 percent ownership in the joint venture. CMI sold to the Company, in
November 1992, a 50 percent ownership in the joint venture for approximately
$120,000. The Company accounts for this investment on the equity method and
includes its share of joint venture net income in "Other income" on the
Consolidated Statements of Income.
 
     In conjunction with establishing the joint venture, the Company also
entered into a distribution agreement with CMI, CMI entered into a
subdistribution agreement with the joint venture and the Company entered into a
research and development agreement with CMI. In the year ended March 31, 1992
the Company received $1.4 million pursuant to the research and development
agreement.
 
     The Company entered into an agreement with the joint venture, effective in
January 1994, in which the Company is obligated to provide certain management
services, assist in marketing, development and planning activities and provide
certain literature to the joint venture during calendar 1994. In consideration
for the Company providing such services, the joint venture has agreed to pay
$700,000 to the Company as reimbursement of costs incurred by the Company,
$445,000 of which has been included in "Other income" for the year ended March
31, 1994.
 
     Summarized information for the joint venture at March 31, 1994 and for the
year then ended is as follows (in thousands):
 
<TABLE>
    <S>                                                                         <C>
    Current assets............................................................  $  8,932
    Current liabilities.......................................................     7,528
    Net sales.................................................................    22,894
    Gross profit..............................................................     8,896
    Income from operations....................................................     2,876
    Net income................................................................     1,038
</TABLE>
 
     The Company's other investments accounted for on the equity method,
comprised of cash investments in and the granting of technology licenses to
certain of the Company's less than 50 percent-owned subsidiaries, are not
significant.
 
10. RELATED PARTY TRANSACTIONS
 
     In April 1991, the Company loaned $150,000 to an executive officer of the
Company pursuant to a promissory note bearing interest at the lower of 10
percent or the prime rate in effect at the end of each calendar quarter. These
notes have all been repaid as of March 31, 1993.
 
     In December 1993, the Company entered into a lease line agreement as lessor
with a less than 50 percent owned subsidiary. The maximum available lease line
of $1.0 million expires March 31, 1995 and requires monthly payments to be made
on the outstanding balance over 36 or 48 months with interest at approximately
8.5 percent per year. As of March 31, 1994 there was $143,000 outstanding under
this agreement.
 
     In March 1994, the Company loaned approximately $200,000 to a less than 50
percent owned subsidiary in exchange for promissory notes bearing interest at
8.5 percent per year. Monthly payments are required over 36 and 48 months. The
Company also entered into a lease line agreement as lessor with this subsidiary
in March 1994. The maximum available lease line of $300,000 expires March 1,
1995 and requires monthly payments to be made on the outstanding balance over 36
or 48 months with interest at approximately 8.5 percent per year. There were no
amounts outstanding under this agreement at March 31, 1994.
 
                                      F-34
<PAGE>   122
 
                           TARGET THERAPEUTICS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
11. LEGAL MATTERS
 
     The Company is involved in legal actions, including product liability
claims, arising in the ordinary course of business. While the outcome of such
matters is currently not determinable, it is management's opinion that these
matters, both individually or in the aggregate, will not have a material adverse
effect on the Company's consolidated financial position or results of its
operations.
 
                                      F-35
<PAGE>   123
 
                           TARGET THERAPEUTICS, INC.
 
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                     DECEMBER 31,     MARCH 31,
                                                                         1994           1994
                                                                     ------------     ---------
                                                                     (UNAUDITED)      (NOTE 1)
<S>                                                                  <C>              <C>
ASSETS
Current assets:
  Cash, cash equivalents and short-term investments................    $ 36,442        $ 37,673
  Accounts receivable..............................................       8,891           6,426
  Inventories......................................................       4,999           2,987
  Deferred tax assets..............................................       2,094           2,094
  Other current assets.............................................         348             289
                                                                     ------------     ---------
          Total current assets.....................................      52,774          49,469
Property and equipment, net........................................       5,878           4,688
Other assets.......................................................       6,232           2,973
                                                                     ------------     ---------
                                                                       $ 64,884        $ 57,130
                                                                     ===========       ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable.................................................    $  1,351        $  1,454
  Accrued compensation.............................................       2,387           2,152
  Taxes payable....................................................       1,110             672
  Accrued product replacement costs................................         978           1,141
  Other accrued liabilities........................................       3,296           1,925
  Deferred tax liabilities.........................................         598             598
                                                                     ------------     ---------
     Total current liabilities.....................................       9,720           7,942
Long-term obligations..............................................         104             124
Stockholders' equity:
  Common stock.....................................................          18              18
  Additional paid-in capital.......................................      41,195          40,593
  Deferred compensation............................................         (43)           (124)
  Retained earnings................................................      13,865           8,608
  Cumulative translation adjustments...............................          57              --
  Notes receivable from stockholders...............................         (32)            (31)
                                                                     ------------     ---------
     Total stockholders' equity....................................      55,060          49,064
                                                                     ------------     ---------
                                                                       $ 64,884        $ 57,130
                                                                     ===========       ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-36
<PAGE>   124
 
                           TARGET THERAPEUTICS, INC.
 
                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                  (UNAUDITED)
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                             NINE MONTHS
                                                                                ENDED
                                                                            DECEMBER 31,
                                                                         -------------------
                                                                          1994        1993
                                                                         -------     -------
<S>                                                                      <C>         <C>
Revenues...............................................................  $34,497     $25,453
Costs and expenses:
  Cost of sales........................................................   11,060      10,103
  Research and development.............................................    7,472       5,468
  Selling, general and administrative..................................    9,645       6,886
                                                                         -------     -------
     Total costs and expenses..........................................   28,177      22,457
                                                                         -------     -------
Income from operations.................................................    6,320       2,996
Interest income, net...................................................      921         682
Other income...........................................................      973         276
                                                                         -------     -------
Income before income taxes and cumulative effect of change in method of
  accounting for income taxes..........................................    8,214       3,954
Provision for income taxes.............................................    2,957       1,344
                                                                         -------     -------
Income before cumulative effect of accounting change...................    5,257       2,610
Cumulative effect of change in method of accounting for income taxes...       --         631
                                                                         -------     -------
Net income.............................................................  $ 5,257     $ 3,241
                                                                         ========    ========
Income per share:
  Income before cumulative effect of accounting change.................  $   .73     $   .37
  Cumulative effect of change in method of accounting for income
     taxes.............................................................       --         .09
                                                                         -------     -------
  Net income...........................................................  $   .73     $   .46
                                                                         ========    ========
Shares used in calculation of income per share data....................    7,190       7,087
                                                                         ========    ========
</TABLE>
 
                            See accompanying notes.
 
                                      F-37
<PAGE>   125
 
                           TARGET THERAPEUTICS, INC.
 
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                         NINE MONTHS ENDED
                                                                           DECEMBER 31,
                                                                       ---------------------
                                                                         1994         1993
                                                                       --------     --------
<S>                                                                    <C>          <C>
Cash flows from operating activities:
  Net income.........................................................  $  5,257     $  3,241
  Adjustments to reconcile net income to net cash provided by
     operations:
     Depreciation and amortization...................................     1,749        1,098
     Changes in assets and liabilities:
       Accounts receivable...........................................    (2,413)        (474)
       Inventories...................................................    (2,009)         534
       Deferred tax assets...........................................        --       (1,163)
       Other current assets..........................................       (59)         211
       Accounts payable..............................................      (103)         202
       Accrued compensation..........................................       235           85
       Taxes payable.................................................       438           (2)
       Accrued product replacement costs.............................      (163)       1,500
       Other accrued liabilities.....................................     1,392          460
       Deferred tax liabilities......................................        --          429
                                                                       --------     --------
     Total adjustments...............................................      (933)       2,880
                                                                       --------     --------
  Net cash provided by operating activities..........................     4,324        6,121
                                                                       --------     --------
Cash flows used in investing activities:
     Capital expenditures, net.......................................    (2,548)      (1,423)
     Purchases of short-term investments.............................   (46,567)     (47,023)
     Sales and maturities of short-term investments..................    49,598       45,526
     Increase in other assets........................................    (3,567)      (1,025)
                                                                       --------     --------
  Net cash used in investing activities..............................    (3,084)      (3,945)
                                                                       --------     --------
Cash flows from financing activities:
     Issuance of common stock for cash...............................       602          478
     Principal payments under capital leases.........................       (42)         (21)
                                                                       --------     --------
  Net cash provided by financing activities..........................       560          457
                                                                       --------     --------
Net increase in cash and cash equivalents............................     1,800        2,633
Cash and cash equivalents, beginning of period.......................     8,679        4,977
                                                                       --------     --------
Cash and cash equivalents, end of period.............................  $ 10,479     $  7,610
                                                                       =========    =========
</TABLE>
 
                            See accompanying notes.
 
                                      F-38
<PAGE>   126
 
                           TARGET THERAPEUTICS, INC.
 
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
1. BASIS OF PRESENTATION
 
     In the opinion of management, the accompanying unaudited condensed
consolidated balance sheet, and the condensed consolidated statements of income
and cash flows reflect all adjustments which are of a normal recurring nature
considered necessary to present a fair statement of the consolidated financial
position at December 31, 1994 and the consolidated statements of income and cash
flows for the nine-month periods ended December 31, 1994 and 1993.
 
     Certain information and footnote disclosures required by generally accepted
accounting principles for complete financial statements have been omitted
pursuant to the rules and regulations of the Securities and Exchange Commission
("SEC"). These financial statements should be read in conjunction with the
audited financial statements and notes included elsewhere herein. The condensed
consolidated balance sheet as of March 31, 1994 was derived from these audited
financial statements.
 
     Results for the interim period ended December 31, 1994, are not necessarily
indicative of the results expected for future interim periods or for the full
year.
 
2. BALANCE SHEET INFORMATION
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,     MARCH 31,
                                                                     1994           1994
                                                                 ------------     ---------
                                                                       (IN THOUSANDS)
    <S>                                                          <C>              <C>
    Cash, cash equivalents and short-term investments:
      Cash and cash equivalents................................    $ 10,479        $ 8,679
      Short-term investments...................................      25,963         28,994
                                                                 ------------     ---------
                                                                   $ 36,442        $37,673
                                                                 ===========      ========
    Accounts receivable:
      Trade receivables........................................    $  9,329        $ 6,840
      Less allowance for doubtful accounts.....................        (438)          (414)
                                                                 ------------     ---------
                                                                   $  8,891        $ 6,426
                                                                 ===========      ========
    Inventories:
      Raw materials............................................    $  1,031        $   531
      Work-in-process..........................................         767          1,152
      Finished goods...........................................       3,201          1,304
                                                                 ------------     ---------
                                                                   $  4,999        $ 2,987
                                                                 ===========      ========
    Property and equipment:
      Machinery and equipment..................................    $  6,956        $ 5,275
      Office equipment.........................................       3,240          2,495
      Leasehold improvements...................................         587            495
                                                                 ------------     ---------
                                                                     10,783          8,265
      Less accumulated depreciation and amortization...........      (4,905)        (3,577)
                                                                 ------------     ---------
                                                                   $  5,878        $ 4,688
                                                                 ===========      ========
</TABLE>
 
                                      F-39
<PAGE>   127
 
                           TARGET THERAPEUTICS, INC.
 
      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
3. SUPPLEMENTAL CASH FLOW INFORMATION
 
<TABLE>
<CAPTION>
                                                                      NINE MONTHS ENDED
                                                                        DECEMBER 31,
                                                                     -------------------
                                                                      1994         1993
                                                                     ------       ------
                                                                       (IN THOUSANDS)
    <S>                                                              <C>          <C>
    Supplemental disclosure of cash flow information:
      Cash paid during the period for income taxes.................  $1,045       $1,313
      Cash paid during the period for interest.....................      48           30
</TABLE>
 
4. INCOME TAXES
 
     For the nine months ended December 31, 1994 and 1993 the provision for
income taxes has been calculated by applying the estimated annual effective tax
rate to income before income taxes.
 
     Effective April 1, 1993 the Company adopted Financial Accounting Standards
Board Statement 109, "Accounting for Income Taxes". As permitted by Statement
109, the Company elected to report the cumulative effect of the change currently
rather than restate the financial statements of prior years. The positive
cumulative effect of the change in method of accounting for income taxes of
$631,000 was recorded in the three-month period ended June 30, 1993.
 
                                      F-40
<PAGE>   128
 
        ---------------------------------------------------------
           ---------------------------------------------------------
        ---------------------------------------------------------
           ---------------------------------------------------------
 
NO PERSON HAS BEEN AUTHORIZED IN
CONNECTION WITH THE OFFERING MADE
HEREBY TO GIVE ANY INFORMATION OR TO
MAKE ANY REPRESENTATION NOT CONTAINED
                                    IN THIS
                                                       $40,000,000
PROSPECTUS AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT
BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY COLLAGEN, TARGET OR THE
UNDERWRITER. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF ANY OFFER TO BUY ANY
OF THE SECURITIES OFFERED HEREBY TO
ANY PERSON OR BY ANYONE IN ANY
JURISDICTION IN WHICH IT IS UNLAWFUL
                                    TO MAKE
                                                     [COLLAGEN LOGO]
SUCH OFFER OR SOLICITATION. NEITHER
THE DELIVERY OF THIS PROSPECTUS NOR
ANY SALE MADE HEREUNDER SHALL, UNDER
ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THE INFORMATION
CONTAINED HEREIN IS CORRECT AS OF ANY
DATE SUBSEQUENT TO THE DATE HEREOF.
 
------------------------------------------------------------
                                                        % EXCHANGEABLE
                                               SUBORDINATED NOTES DUE 2002
          TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                          PAGE
                                         ------
<S>                                      <C>
Available Information....................      2
</TABLE>
 
                                                     EXCHANGEABLE FOR
<TABLE>
<S>                                      <C>
Incorporation of Certain Documents of
  Collagen by
</TABLE>
 
                                                SHARES OF COMMON STOCK OF
<TABLE>
<S>                                      <C>
  Reference..............................      3
Incorporation of Certain Documents of
  Target by Reference....................      3
Prospectus Summary.......................      4
Risk Factors.............................      8
</TABLE>
 
                                                      [TARGET LOGO]
<TABLE>
<S>                                      <C>
Use of Proceeds..........................     19
Capitalization of Collagen...............     19
Price Range of Target Common Stock
  and Dividend Policy....................     20
Selected Consolidated Financial Data
  of Collagen............................     21
Management's Discussion and Analysis of
  Financial
</TABLE>
 
                    ------------------------------------------------------------
<TABLE>
<S>                                      <C>
  Condition and Results of Operations of
  Collagen...............................     22
Selected Consolidated Financial Data
</TABLE>
 
                                                        PROSPECTUS
<TABLE>
<S>                                      <C>
  of Target..............................     29
Management's Discussion and Analysis of
  Financial
</TABLE>
 
                    ------------------------------------------------------------
<TABLE>
<S>                                      <C>
  Condition and Results of Operations of
  Target.................................     30
Business of Collagen.....................     37
Business of Target.......................     45
Management of Collagen...................     61
Management of Target.....................     64
Description of the Notes.................     67
Certain United States Federal Income
  Tax Consequences.......................     77
</TABLE>
 
                                                    ALEX. BROWN & SONS
<TABLE>
<S>                                      <C>
Description of Target Capital Stock......     81
</TABLE>
 
                                                       INCORPORATED
<TABLE>
<S>                                      <C>
Beneficial Ownership of Target Common
  Stock by Collagen and Certain
  Other Relationships....................     83
Underwriting.............................     84
Legal Matters............................     85
Experts..................................     85
Index to Financial Statements............    F-1
</TABLE>
 
                                                      April   , 1995
 
        ---------------------------------------------------------
           ---------------------------------------------------------
        ---------------------------------------------------------
           ---------------------------------------------------------
<PAGE>   129
    
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES
     AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY OFFERS TO
     BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
     EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
     SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE
     IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO
     REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
                                                           SUBJECT TO COMPLETION
                                                                          , 1995
 
                        [TARGET THERAPEUTICS, INC. LOGO]
 
                             SHARES OF COMMON STOCK
                           ISSUABLE UPON EXCHANGE OF
                    % EXCHANGEABLE SUBORDINATED NOTES DUE 2002
                            OF COLLAGEN CORPORATION
 
                            ------------------------
 
     All of the shares of Common Stock ("Target Common Stock") of Target
Therapeutics, Inc. ("Target") offered hereby are being offered and sold by
Collagen Corporation ("Collagen"), upon exchange of certain      % Exchangeable
Subordinated Notes Due 2002 of Collagen (the "Notes").
 
     The Target Common Stock is traded on the Nasdaq National Market under the
symbol "TGET." On March 28, 1995, the last sale price of the Target Common Stock
as reported on the Nasdaq National Market was $37.75 per share.
 
                            ------------------------
 
          THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                              SEE "RISK FACTORS."
 
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
         REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
              THE DATE OF THIS PROSPECTUS IS               , 1995.
<PAGE>   130
 
                             AVAILABLE INFORMATION
 
     Target Therapeutics, Inc. (together with its subsidiaries, unless the
context otherwise requires, "Target") is subject to the informational
requirements of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and in accordance therewith file reports and other information with the
Securities and Exchange Commission (the "Commission"). Reports, proxy and
information statements and other information filed by Target may be inspected
and copied at the public reference facilities maintained by the Commission at
Room 1024, 450 Fifth Street, N.W., Washington, D.C. and at certain of its
regional offices located at: Seven World Trade Center, 13th Floor, New York, New
York; and 500 West Madison Street, Suite 1400, Chicago, Illinois. Copies of such
material can be obtained from the Public Reference Section of the Commission,
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The Target
Common Stock is traded on the Nasdaq National Market. Reports and other
information concerning Target may be inspected at the National Association of
Securities Dealers, Inc., 1735 K Street, Washington, D.C.
 
     Target has filed with the Commission a registration statement on Form S-3
(herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"), relating to the shares of Target Common Stock offered hereby.
This Prospectus does not contain all of the information set forth in the
Registration Statement, certain parts of which are omitted in accordance with
the rules and regulations of the Commission. For further information, reference
is hereby made to the Registration Statement.
 
           INCORPORATION OF CERTAIN DOCUMENTS OF TARGET BY REFERENCE
 
     The following documents heretofore filed by Target with the Commission
pursuant to the Exchange Act are incorporated by reference in this Prospectus:
 
     (1) Annual Report on Form 10-K for the year ended March 31, 1994, and those
         portions of the Proxy Statement for the 1994 Annual Meeting of
         Stockholders (held on August 10, 1994) incorporated by reference
         therein;
 
     (2) Quarterly Reports on Form 10-Q for the quarters ended June 30, 1994,
         September 30, 1994 and December 31, 1994;
 
     (3) Current Report on Form 8-K dated October 10, 1994, as amended;
 
     (4) Registration Statement on Form 8-A dated January 15, 1992; and
 
     (5) Registration Statement on Form 8-A dated September 21, 1994 (relating
         to certain preferred stock purchase rights).
 
     All documents subsequently filed by Target pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934 prior to the
termination of the offering of Target Common Stock made hereby, shall be deemed
to be incorporated by reference herein and to be a part hereof from the date of
the filing of such documents. Target will provide without charge a copy of any
and all of such documents (exclusive of exhibits unless such exhibits are
specifically incorporated by reference therein) without charge to each person to
whom a copy of this Prospectus is delivered, upon written or oral request to
Investor Relations, Target, Inc., 47201 Lakeview Boulevard, Fremont, CA 94538
(telephone number: (510) 440-7700).
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any subsequently filed document which also is incorporated or deemed to be
incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
 
                            ------------------------
 
     Target, Tracker, Soft Stream, Retriever, Taper, Seeker, Dasher, Stealth,
Zephyr, FasTRACKER and GDC are registered trademarks of Target, and IDC,
FasSTEALTH and FasGUIDE are trademarks of Target. This prospectus also includes
trademarks of companies other than Target.
 
                                        2
<PAGE>   131
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information appearing elsewhere in this Prospectus.
 
                                     TARGET
 
     Target develops, manufactures and markets disposable and implantable
medical devices used in minimally invasive procedures to treat vascular diseases
of the brain associated with stroke and other disease sites accessible through
small vessels of the circulatory system. Interventional physicians can navigate
Target's variable stiffness micro-catheters and guidewires through tortuous
blood vessels not accessible using conventional catheters. Target's products are
used to treat diseased, ruptured or blocked blood vessels in the brain
responsible for stroke, the third leading cause of death in the United States.
One of these products, the GDC system, is being used in clinical trials to treat
and prevent the rupture of cerebral aneurysms. Target has recently submitted a
510(k) application to the FDA covering the GDC system. Target's products are
also used in regions of the body other than the brain. Target's products are
used prior to or in lieu of surgery and can significantly reduce procedural
trauma, complexity, risk to the patient, cost and recovery time. Target markets
its products through a direct sales force in North America and internationally
through a network of 30 specialty distributors, its German subsidiary, Target
Therapeutics International GmbH, and its joint venture in Japan with Century
Medical, Inc., a subsidiary of ITOCHU International, Inc.
 
                                  RISK FACTORS
 
     The securities offered hereby involve a high degree of risk. See "Risk
Factors."
 
                                  THE OFFERING
 
SECURITIES OFFERED.........  Common Stock of Target issuable upon exchange of
                                  % Exchangeable Subordinated Notes Due 2002 of
                             Collagen, a Delaware corporation, at an exchange
                             price of $     per share, subject to adjustment
                             under certain conditions and subject to Collagen's
                             right to pay a cash equivalent.
 
TAXABILITY OF EXCHANGE.....  The exchange of a Note for Target Common Stock or
                             other Exchange Property will be treated as a
                             taxable disposition of the Note. See "Certain
                             United States Federal Income Tax Considerations."
 
TRADING INFORMATION........  The Target Common Stock is traded on the Nasdaq
                             National Market under the symbol "TGET."
 
                                        3
<PAGE>   132
 
              SUMMARY CONSOLIDATED FINANCIAL INFORMATION OF TARGET
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                             NINE MONTHS ENDED
                                                                     YEARS ENDED MARCH 31,                      DECEMBER 31,
                                                       --------------------------------------------------    ------------------
                                                        1990      1991       1992       1993       1994       1993       1994
                                                       ------    -------    -------    -------    -------    -------    -------
<S>                                                    <C>       <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF INCOME DATA:
Total revenues......................................   $8,604    $12,510    $20,449    $28,117    $35,353    $25,453    $34,497
Income from operations..............................      876      1,243      3,735      4,421      5,116      2,996      6,320
Net income..........................................      583        707      2,500      3,580      4,951      3,241      5,257
Net income per share (1992-pro forma)(1)............                        $   .51    $   .51    $   .70    $   .46    $   .73
Shares used in computing net income per share and
  pro forma net income per share....................                          5,093      7,075      7,103      7,087      7,190
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                          MARCH 31,     DECEMBER 31,
                                                                                            1994            1994
                                                                                          ---------     ------------
<S>                                                                                       <C>           <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital.........................................................................   $41,527        $ 43,054
Total assets............................................................................    57,130          64,884
Long-term obligations...................................................................       124             104
Stockholders' equity....................................................................    49,064          55,060
</TABLE>
 
---------------
(1) See Notes 1 and 6 of Notes to Consolidated Financial Statements of Target
    incorporated by reference in this Prospectus for pro forma information
    relating to Target's accounting for income taxes as a separate company.
 
                                        4
<PAGE>   133
 
                                    RISK FACTORS
 
     In addition to the other information in this Prospectus and documents
incorporated by reference herein, the following factors should be considered
carefully in evaluating an investment in the Target Common Stock offered by this
Prospectus.
 
RISK FACTORS RELATING TO TARGET
 
     Volatility of Stock Price and Quarterly Fluctuations in Operating
Results.  Target's stock price has been and may continue to be subject to
significant volatility, particularly on a quarterly basis. Any shortfall in
revenues or earnings from levels expected by securities analysts could have an
immediate and significant adverse effect on the trading price of Target's Common
Stock in any given period. Furthermore, Target participates in a highly dynamic
industry, which often results in significant volatility of Target's Common Stock
price. The trading price of Target's Common Stock also may vary on the basis of
numerous other factors, including the timing and amount of expenses associated
with expanding Target's operations both domestically and internationally,
increased revenues and expenses in conjunction with Target's recently commenced
German operations, Target's ability to successfully meet new product development
plans, success in achieving regulatory clearance for new products (such as
Target's detachable coil systems) in a timely manner, the acceptance of new
product introductions both in the United States and internationally, the mix
between pilot production of new products and full-scale manufacturing of
existing products, the mix between domestic and export sales, the availability
of complementary products and the effects this may have, particularly on
domestic sales, possible changes in ordering patterns of its customers due to
changes in the business environment or to potential variations in foreign
exchange rates, Target's ability to continue to attract qualified engineers to
further the development of future products, potential future partnering
arrangements, changes in the domestic and foreign health care policies
(including third-party reimbursement issues), increased competitive forces,
developments in Target's ongoing intellectual property litigation, and the
general litigious nature of the medical device industry. Target also believes
that seasonal patterns, including a reduction in the number of procedures
performed by physicians using Target's products during summer and holiday
periods, may affect its quarterly revenue stream. In addition, Target cannot
predict ordering rates by distributors, some of which place infrequent stocking
orders while others order at regular intervals. Although Target has experienced
revenue growth since its inception and has been profitable on a quarterly basis
since the quarter ended December 31, 1990, no assurance can be given that
revenue growth or profitability on a quarterly or annual basis will be
sustained. Target's results of operations have varied significantly from quarter
to quarter, and revenue growth rates have been inconsistent. As a result of
these and other factors, Target expects to continue to experience significant
fluctuations in the trading price of its Common Stock and in its quarterly
operating results.
 
     Reliance on Future Products and New Applications.  Target has an ongoing
and active research and development program pursuant to which it is developing
several new and enhanced versions of its catheters, guidewires and micro-coils.
Target's future success will depend upon, among other factors, its ability to
develop or acquire from third parties, introduce and manufacture new products or
enhanced versions of existing products and to obtain regulatory clearance on a
timely basis for such products or for use of existing products for new
indications. Target is also developing technology that enhances the performance
of its existing catheter and guidewire products. In addition, Target has several
new versions of its micro-coils under development. There can be no assurance
that Target will be able to develop or acquire new products successfully, to
manufacture new products in commercial volumes, to obtain regulatory clearances
on a timely basis to use such products in existing or new clinical applications
or to gain satisfactory market acceptance for such products. Delays in
commercial introduction or acceptance of new products could have a material
adverse effect on Target's business, financial condition and results of
operations. See "Business of Target -- Product Development" and "Business of
Target -- Government Regulation and Product Testing."
 
     Governmental Regulation.  The manufacture and marketing of Target's
products are subject to extensive and rigorous federal and state regulation in
the United States and to various regulatory requirements in other countries. The
process of obtaining and maintaining required regulatory clearances is lengthy,
expensive and uncertain. The FDA requires that a new medical device or a new
indication for use of an existing medical
 
                                        5
<PAGE>   134
 
device obtain either a 510(k) premarket notification clearance or an approved
Premarket Approval application ("PMA") prior to being introduced into the
market. The process of obtaining a 510(k) clearance has recently taken at least
six months from the date of filing of the application and generally requires the
submission of supporting data, which can be extensive and extend the process for
a considerable length of time. In addition, the FDA may require review by an
advisory panel as a condition for 510(k) clearances, which can further lengthen
the process. The PMA process generally takes more than two years from initial
filing and requires the submission of extensive supporting data and clinical
information. No assurance can be given that any future products or applications
developed by Target will not require clearance under the more lengthy and
expensive PMA process. If Target is required to obtain clearance for any
products pursuant to the PMA procedure or if the 510(k) process with respect to
any products is extended for a considerable length of time, the commencement of
commercial marketing could be delayed substantially.
 
     Sales of medical devices outside the United States are subject to foreign
regulatory requirements that vary widely from country to country. The time
required to obtain clearance required by foreign countries may be longer or
shorter than that required for FDA clearance, and requirements for licensing may
differ significantly from FDA requirements. Some countries have historically
permitted human studies earlier in the product development cycle than
regulations in the United States. Other countries, such as Japan, have standards
similar to those of the FDA. This disparity in the regulation of medical devices
may result in more rapid product clearance in certain countries than in the
United States, while clearance in countries such as Japan may require longer
periods than in the United States. In addition, the European Union has developed
a new approach to the regulation of medical products which may significantly
change the situation in those countries. The receipt or denial of FDA clearance
for a particular product may affect the receipt or denial of regulatory
clearance for that product in certain other countries.
 
     There can be no assurance that Target will obtain timely regulatory
clearance for its future products, or that existing clearances will not be
withdrawn. In particular, there can be no assurance that Target's pending 510(k)
application for the Guglielmi Detachable Coil ("GDC") system, which was filed in
March 1995, will be granted in a timely manner or at all. Target anticipates
that this application, which includes clinical data on approximately 800
patients, will be reviewed by advisory consultants to the FDA, some of whom may
also be members of other FDA panels, which is expected to further extend the
review process. Moreover, regulatory clearances, if granted, may include
significant limitations on the indicated uses for which a product may be
marketed. Failure to comply with applicable regulatory requirements can, among
other consequences, result in fines, civil penalties, injunctions, suspensions
or losses of regulatory clearances, product recalls, seizure of products,
operating restrictions, refusal of the government to approve product license
applications or allow Target to enter into supply contracts, and criminal
prosecution. In addition, governmental regulations may be established that could
prevent or delay regulatory clearance of Target's products. Delays in receipt
of, or failure to receive, clearances, or the loss of previously received
clearances, could have a material adverse effect on Target's business, financial
condition and results of operations. See "Business of Target -- Government
Regulation and Product Testing."
 
     Product Liability Litigation; Insurance.  Target faces the risk of
financial exposure to product liability claims alleging that the use of Target's
products resulted in adverse effects. Target's products are often used in
life-threatening situations and in the brain, where there is a high risk of
serious injury or death. Such risks will exist even with respect to those
products that have received, or in the future may receive, regulatory clearance
for commercial sale. Target is currently a party to several legal actions
involving product liability claims. While Target seeks to maintain product
liability insurance with coverage that Target believes is comparable to that
maintained by companies similar in size and serving similar markets, there can
be no assurance that Target will avoid significant product liability claims and
attendant adverse publicity. Furthermore, there can be no assurance that
Target's product liability insurance will be adequate or that such insurance
coverage will remain available at acceptable costs. A successful claim brought
against Target for which coverage is denied or in excess of its insurance
coverage could have a material adverse effect on Target's business, financial
condition and results of operations. Additionally, it is possible that adverse
product liability actions could negatively affect Target's ability to obtain and
maintain regulatory clearance for its products. See "Business of
Target -- Product Liability Litigation and Insurance."
 
                                        6
<PAGE>   135
 
     Concentrated Customer Base and Adoption of Technology.  Target believes
that the number of interventional neuroradiologists and neurosurgeons trained to
use its vascular access and delivery products to treat neurovascular disorders
is relatively small, both in the United States and abroad. The growth in the
number of neuro-interventional physicians in the United States is constrained by
the lengthy training programs required to educate these physicians. Target
believes that there are approximately 130 interventional neuro-radiologists in
the United States and that approximately 30 physicians are currently being
trained to perform neuro-interventional procedures in fellowship programs at 15
hospitals in North America. Future growth of the market for Target's
neurovascular micro-catheters will require continued expansion of the number of
trained interventional practitioners. To the extent that physicians do not adopt
micro-catheters for use in treating neurovascular disorders or sufficient
physicians are not trained in the use of Target's products, both in the United
States and abroad, the market for Target's products may remain limited. See
"Business of Target -- Marketing and Sales."
 
     Competition.  The medical device industry is characterized by rapidly
evolving technology and competition. Target currently experiences competition in
the interventional neuroradiology market and expects such competition to
increase substantially. Several companies in the United States, including large
companies with resources significantly greater than those of Target, have
introduced products that are being used in the interventional neuroradiology
market. Target is also aware of other companies that may pursue
commercialization of products which may compete with Target's products and may
result in pricing and margin pressures within this market. There can be no
assurance that these companies will not succeed in developing technologies and
products that are more effective than any which have been or are being developed
by Target or that would render Target's technologies or products obsolete or not
competitive.
 
     The cardiovascular and peripheral vascular interventional markets are
substantially more developed than the neuroradiology market and are subject to
intense competition. There are many large companies with significantly greater
financial, manufacturing, marketing, distribution and technical resources, and
experience than Target focusing principally on cardiovascular and peripheral
applications for their catheter technologies. As a result, Target focuses its
product development and marketing strategies on market segments where Target's
small vessel access and delivery systems can be used in applications not
presently addressed by conventional catheter and other interventional products.
There can be no assurance, however, that competitors will not successfully enter
these markets with superior products. In addition, Target is aware of several
other companies that have introduced guidewires to the marketplace and
attributes the slower growth rate of its guidewire product line to increased
competitive pressures. Such competition could have a material adverse effect on
Target's business, financial condition and results of operations. See "Business
of Target -- Competition."
 
     Patents and Proprietary Technology.  The medical device market is
characterized by substantial litigation regarding patent and other intellectual
property rights. Target is aware of certain United States patents with which
certain of Target's current or proposed products may be in conflict. Two United
States patents held by third parties may cover certain of Target's
micro-catheter products. With respect to one of these patents, based upon
Target's analysis with the assistance of its patent counsel, Target believes
that such patent is invalid. With respect to the other of these patents,
although Target has not obtained a formal opinion of counsel, Target believes
that it has available defenses to a claim of infringement with respect to such
patent. However, the invalidity of any particular patent and the availability of
Target's defenses must be determined by a court in the event of litigation, and
no assurance can be given that any dispute will be resolved in a manner
satisfactory to Target. With respect to another patent that may cover one
element in the fabrication of a particular guidewire product and one potential
guidewire product, Target has designed a guidewire product that Target believes
avoids the risk of infringement. However, Target has continued and expects to
continue to market the existing guidewire product for the foreseeable future.
The above-described patents are held by large companies, each of which has
substantial resources, and no assurance can be given that such companies will
not be successful in maintaining the validity of their patents. If legal action
is commenced against Target to enforce these patents and the plaintiff in such
action prevails, Target could be prevented from practicing the subject matter
claimed in such patents. In such event or under other appropriate circumstances,
Target may attempt to obtain licenses to such patents or redesign its products.
Target is also aware that certain of its
 
                                        7
<PAGE>   136
 
products under development may be covered by existing patents, in which event
Target may be required to obtain licenses prior to the introduction and
commercial shipment of such products. There can be no assurance that such
licenses will be available or, if available, will be available on terms
acceptable to Target, or that Target will be successful in any attempt to
redesign its products or processes to avoid infringement. Moreover, there can be
no assurance that Target has identified all patents that may pose a risk of
infringement by Target's current or proposed products. Target's business, future
operating results and financial condition could be materially and adversely
affected if its products are found to infringe any of these patents. Target has
depended and will continue to depend substantially on its technological
expertise in the development and manufacture of its current and future products.
In addition, Target depends and will likely continue to depend on trade secret
protection and on various patents, such as its patent covering the variable
stiffness shaft design of its micro-catheters, to strengthen its proprietary
position. There can be no assurance that Target will be successful in the future
in obtaining patents or that patents will not be challenged by third parties.
There can be no assurance that measures to protect trade secrets will be
successful, or that others will not independently develop similar products,
duplicate any of Target's products, or design around any patents owned or
licensed by Target. Litigation, which could result in substantial costs to and
diversion of effort by management of Target, may be necessary to enforce patents
issued to Target, to protect trade secrets or know-how owned by Target or to
defend Target against claimed infringement of the rights of others and to
determine the scope and validity of the patents or other proprietary rights of
other entities. The resolution of these claims generally involves complex legal
and factual questions and is highly uncertain. Adverse determinations in any
litigation could subject Target to significant liabilities to third parties,
require Target to seek licenses from third parties and prevent Target from
manufacturing and selling its products, any of which could have a material
adverse effect on Target's business, financial condition and results of
operations. See "Business of Target -- Patents, Trade Secrets and Licenses."
 
     The patent which relates to the variable stiffness design of Target's
Tracker micro-catheters (the "Tracker patent") has been the subject of
reexamination proceedings in the United States Patent and Trademark Office
("PTO"). The first such proceeding concluded on November 15, 1994, when the PTO
issued a reexamination certificate and confirmed the patentability of the patent
claims set forth in the certificate. The second reexamination of the patent was
initiated by one of Target's competitors, SciMed Life Systems, Inc. ("SciMed") a
subsidiary of Boston Scientific Corporation, raising new issues of
patentability. A petition for a third reexamination was filed recently by the
same competitor alleging another issue of patentability and requiring the merger
with the second reexamination. Both proceedings are currently pending in the
PTO. No assurance can be given that the PTO will issue a reexamination
certificate confirming the patentability of the patent claims, or that the
patent claims will not be amended in ways that will reduce any competitive
advantages the Tracker patent has provided for Target's products.
 
     During the last half of calendar 1994, Target learned that two of its
United States competitors had commenced sales in the United States of
micro-catheters that Target believes infringe the Tracker patent. On November 9,
1994, Target filed a lawsuit against SciMed and Cordis Endovascular Systems,
Inc. in the United States District Court in San Jose, seeking damages and
preliminary and permanent injunctive relief against further infringing sales.
The defendants responded, challenging the validity of the Tracker patent,
denying infringement, and raising other defenses. The Court has stayed the
lawsuit until the pending reexamination proceedings have been completed in the
PTO. There can be no assurance that Target will be successful in this action or
that even if Target receives a favorable ruling in the pending reexamination,
the defendants will not prevail in this lawsuit.
 
     Target is also aware that at least one competitor in Europe has sold
micro-catheters that may infringe a patent that could issue on Target's patent
application which is pending in the European Patent Office. Target is
investigating its options for enforcement of its rights with respect to such
infringement. The patent which relates to the variable stiffness design of
Target's Tracker micro-catheter is being opposed in Japan by an undisclosed
party.
 
     Importance of Foreign Sales.  Export product sales outside of the United
States were 61%, 60% and 69% of product sales, respectively, for the fiscal
years ended March 31, 1993 and 1994 and for the nine months ended December 31,
1994. Target anticipates that product sales to customers in Europe and Japan
will
 
                                        8
<PAGE>   137
 
generate a majority of total product sales through at least fiscal year 1996.
Fluctuations in the value of foreign currencies relative to the U.S. dollar
could adversely affect Target's sales and results of operations from time to
time. Target's international operations are also subject to certain other risks
common to foreign operations in general, including governmental regulations and
import and export restrictions. Changes in such governmental regulations or
import and export restrictions could adversely affect sales of Target's products
and Target's results of operations.
 
     Third-Party Reimbursement.  Target's products are purchased by hospitals,
which, in the United States, then bill various third-party payors including
Medicare, Medicaid and private insurers for the healthcare services provided to
patients. Government agencies reimburse hospitals for medical procedures at a
fixed rate according to diagnosis-related groups. Federal and state laws and
regulations govern reimbursement by such government agencies. Such laws and
regulations also influence reimbursement of medical fees by private insurance
companies. Changes in current policies could reduce or eliminate such
reimbursements and thereby adversely affect future sales of Target's products.
In addition, third-party payors may deny reimbursement if they determine that
the device used in the procedure is unnecessary, inappropriate, not
cost-effective, experimental or for a non-approved indication. Third-party
payors may deny reimbursement for treatments using Target's products, regardless
of the FDA clearance status of such products. Third-party payors are
increasingly challenging the prices charged for medical products and services.
There can be no assurance that reimbursement from third-party payors will be
available, or if available, that reimbursement will not be limited, thereby
adversely affecting Target's ability to sell its products profitably. Although
Target has not experienced any problems to date, significant uncertainty exists
as to the reimbursement status of newly approved healthcare products, and there
can be no assurance that adequate third-party coverage will be available to
patients. In such event, sales of Target's products could be adversely affected.
 
     Dependence on Key Personnel.  Target is dependent upon a limited number of
key management and technical personnel. Target's future success will depend in
part upon its ability to attract and retain highly qualified personnel. Target
competes for such personnel with other companies, academic institutions,
government entities and other organizations. There can be no assurance that
Target will be successful in hiring or retaining qualified personnel. The loss
of key personnel or the inability to hire or retain qualified personnel could
have a material adverse effect on Target's business, financial condition and
results of operations. See "Business of Target -- Employees."
 
     Control By Collagen.  As of March 15, 1995, Collagen owned 2,124,194 shares
of Target Common Stock, representing approximately 30% of the outstanding shares
of Target Common Stock. Prior to any exchange of Notes for Target Common Stock,
Collagen will continue to own the shares of Common Stock issuable upon exchange
of the Notes, and will continue to exercise all rights, including voting rights,
incident to such ownership. Accordingly, Collagen has sufficient voting power to
significantly influence the outcome of matters submitted to Target's
stockholders for approval. As a result, Collagen may have the power to influence
any potential proxy contest, merger, tender offer, open-market repurchase
program or other purchases of Target Common Stock that could result in a change
of the composition of the Exchange Property or give the holders of Target Common
Stock the opportunity to realize a premium over the then prevailing market price
for shares of Target Common Stock. In addition, two members of Target's Board of
Directors, Howard D. Palefsky and William G. Davis, are also directors of
Collagen, and Mr. Palefsky also is an officer of Collagen, and Collagen thereby
may be able to exercise additional control over Target's affairs. See
"Beneficial Ownership of Target Common Stock By Collagen and Certain Other
Relationships."
 
     Single Manufacturing Facility.  All of Target's manufacturing capacity is
located in a single facility. An earthquake, fire or other similar calamity
could result in significant disruptions and delays in Target's manufacturing and
distribution process. Target currently maintains only limited amounts of certain
finished product inventory, and Target's business, financial position and
results of operations could be materially adversely affected in such event.
 
     Future Sales of Target Common Stock.  Future sales of Target Common Stock
in the public market could adversely affect prevailing market prices of the
Target Common Stock and, as a result, the trading price of the Notes offered
hereby. Substantially all of the outstanding shares of Target Common Stock are
freely tradeable in the open market, subject only in the case of affiliates of
Target to the volume and other limitations of Rule 144 under the Securities Act.
Collagen, Target and executive officers and directors of Collagen and Target
have agreed subject to certain limited exceptions not to offer to sell, contract
to sell or otherwise sell or
 
                                        9
<PAGE>   138
 
dispose of any shares of Target Common Stock, any options or warrants to
purchase Target Common Stock, or any securities convertible into or exchangeable
for shares of Target Common Stock for a period of 90 days following the date of
this Prospectus, without the prior written consent of the Underwriter. Collagen
has in the past sold and expects to continue to sell shares of Target Common
Stock in the open market or otherwise, subject to the limitations of Rule 144
and Collagen's agreement with the Underwriter to refrain from sales of Target
Common Stock for a period of 90 days after the date of this Prospectus. Such
sales may have the effect of depressing the trading price of Target's Common
Stock. See "Beneficial Ownership of Target Common Stock By Collagen and Certain
Other Relationships."
 
                                       10
<PAGE>   139
 
                 SELECTED CONSOLIDATED FINANCIAL DATA OF TARGET
 
     The consolidated statement of income data of Target set forth below for the
fiscal years ended March 31, 1992, 1993 and 1994 and the consolidated balance
sheet data at March 31, 1993 and 1994 are derived from, and are qualified by
reference to, the audited consolidated financial statements incorporated by
reference in this Prospectus. The consolidated statement of income data for the
fiscal years ended March 31, 1990 and 1991 and the consolidated balance sheet
data at March 31, 1990, 1991 and 1992 are derived from audited consolidated
financial statements not included in this Prospectus. The consolidated statement
of income data for the nine month periods ended December 31, 1993 and 1994, and
the consolidated balance sheet data at December 31, 1994 have been derived from
unaudited interim condensed financial statements incorporated by reference in
this Prospectus and reflect, in management's opinion, all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation of the results of income for such periods. Results of operations
for any interim period are not necessarily indicative of results to be expected
for the full fiscal year.
 
<TABLE>
<CAPTION>
                                                                                                             NINE MONTHS ENDED
                                                                     YEARS ENDED MARCH 31,                      DECEMBER 31,
                                                       --------------------------------------------------    ------------------
                                                        1990      1991       1992       1993       1994       1993       1994
                                                       ------    -------    -------    -------    -------    -------    -------
<S>                                                    <C>       <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF INCOME DATA:
Total revenues......................................   $8,604    $12,510    $20,449    $28,117    $35,353    $25,453    $34,497
Costs and expenses:
  Cost of sales.....................................    3,001      4,558      6,920      9,657     13,368     10,103     11,060
  Research and development..........................    2,044      3,129      4,347      6,496      7,624      5,468      7,472
  Selling, general and administrative...............    2,683      3,580      5,447      7,543      9,245      6,886      9,645
                                                       ------    -------    -------    -------    -------    -------    -------
    Total costs and expenses........................    7,728     11,267     16,714     23,696     30,237     22,457     28,177
                                                       ------    -------    -------    -------    -------    -------    -------
Income from operations..............................      876      1,243      3,735      4,421      5,116      2,996      6,320
Interest income, net................................        1        (50)       297        890        954        682        921
Other income........................................       --         --         --         16        515        276        973
                                                       ------    -------    -------    -------    -------    -------    -------
Income before income taxes and cumulative effect of
  change in method of accounting for income taxes...      877      1,193      4,032      5,327      6,585      3,954      8,214
Provision for income taxes..........................      294        486      1,532      1,747      2,265      1,344      2,957
                                                       ------    -------    -------    -------    -------    -------    -------
Income before cumulative effect of accounting
  change............................................      583        707      2,500      3,580      4,320      2,610      5,257
Cumulative effect of change in method of accounting
  for income taxes..................................       --         --         --         --        631        631         --
                                                       ------    -------    -------    -------    -------    -------    -------
Net income..........................................   $  583    $   707    $ 2,500    $ 3,580    $ 4,951    $ 3,241    $ 5,257
                                                       ======    =======    =======    =======    =======    =======    =======
Income per share:
  Income before cumulative effect of accounting
    change..........................................                                   $   .51    $   .61    $   .37    $   .73
  Cumulative effect of change in method of
    accounting for income taxes.....................                                        --        .09        .09         --
                                                                                       -------    -------    -------    -------
  Net income per share..............................                                   $   .51    $   .70    $   .46    $   .73
                                                                                       =======    =======    =======    =======
Pro forma net income (unaudited)(1).................                        $ 2,599
                                                                            =======
Pro forma net income per share (unaudited)(1).......                        $   .51
                                                                            =======
Shares used in computing income per share and pro
  forma net income per share data...................                          5,093      7,075      7,103      7,087      7,190
                                                                            =======    =======    =======    =======    =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                            MARCH 31,
                                                        -------------------------------------------------     DECEMBER 31,
                                                         1990      1991      1992       1993       1994           1994
                                                        ------    ------    -------    -------    -------     ------------
<S>                                                     <C>       <C>       <C>        <C>        <C>         <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital......................................   $2,269    $2,601    $34,602    $37,370    $41,527       $ 43,054
Total assets.........................................    5,670     7,166     42,103     46,827     57,130         64,884
Long-term obligations................................      140       169        138        152        124            104
Stockholders' equity.................................    3,839     4,578     37,983     42,462     49,064         55,060
</TABLE>
 
---------------
(1) See Notes 1 and 6 of Notes to Consolidated Financial Statements of Target
    incorporated by reference in this Prospectus for pro forma information
    relating to Target's Accounting for Income Taxes as a separate company.
 
                                       11
<PAGE>   140
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
            FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF TARGET
 
     The following discussion should be read in conjunction with Target's
consolidated financial statements, notes thereto and discussion thereof
incorporated by reference herein.
 
OVERVIEW
 
     Target's revenues have been derived primarily from the sale of its
micro-catheters, guidewires and micro-coils. Target also derives a portion of
its revenues from the distribution of certain products manufactured by other
companies pursuant to distribution agreements. Target also entered into a
research and development agreement with Century Medical, Inc. ("CMI") in March
1991, under which CMI provided $2.0 million of development funding, of which
$1.4 million was included in revenue in fiscal 1992, to assist Target in the
development of its Stealth balloon angioplasty micro-catheter. In addition,
Target entered into a management agreement, effective in January 1994, with its
Japanese joint venture in which Target was obligated to provide certain
management services for which Target was reimbursed during calendar 1994.
 
RESULTS OF OPERATIONS
 
     The following table sets forth certain selected statement of income
information of Target as a percentage of product sales for the periods
indicated.
 
<TABLE>
<CAPTION>
                                                                                     NINE MONTHS
                                                                                        ENDED
                                                          YEARS ENDED MARCH 31,      DECEMBER 31,
                                                         -----------------------    --------------
                                                         1992     1993     1994     1993     1994
                                                         -----    -----    -----    -----    -----
<S>                                                      <C>      <C>      <C>      <C>      <C>
Product sales.........................................     100%     100%     100%     100%     100%
Other revenue.........................................       7       --       --       --       --
Costs and expenses:
  Cost of sales.......................................      36       34       38*      40*      32
  Research and development............................      23       23       22       21       22
  Selling, general and administrative.................      29       27       26       27       28
</TABLE>
 
---------------
 
*Includes $1.5 million charge for costs associated with changes being made to
 the Guglielmi Detachable Coil system as described under Cost of Sales below.
 Cost of sales, exclusive of this charge, was 34% of product sales for both the
 fiscal year ended March 31, 1994 and the nine months ended December 31, 1993.
 
  COMPARISON OF ANNUAL AND NINE-MONTH RESULTS OF OPERATIONS
 
     Revenues.  Total revenues for the year ended March 31, 1994 were $35.4
million, an increase of $7.2 million, or 26%, from $28.1 million for the prior
year. Total revenues for the year ended March 31, 1993 increased 37% from $20.4
million in fiscal 1992. Total revenues for the year ended March 31, 1992
included $1.4 million received under the CMI research and development agreement.
Product sales of $28.1 million in fiscal 1993 represented an increase of 48%
over $19.0 million in fiscal 1992. These increases were primarily attributable
to new product introductions and additional unit sales in each of Target's
product lines resulting from an increased number of treatment sites, training of
additional physicians and the continued acceptance of Target's products. During
fiscal 1993, Target implemented a nominal price increase to certain of its
products to both domestic and international customers with the exception of its
distributor in Japan. Target currently intends to increase prices to its
Japanese distributor in fiscal 1996. See "-- Interest and Other Income."
 
     Revenues for the nine months ended December 31, 1994 were $34.5 million, an
increase of 36% compared to $25.5 million for the prior year period. The
increase was primarily attributable to the continued acceptance of new and
recently enhanced products and additional sales in each of Target's product
lines resulting from an increased number of treatment sites and the training of
additional physicians.
 
                                       12
<PAGE>   141
 
     The increase in Target's revenues is also attributable to the growing
market for Target's products in Europe and Japan. Export product sales increased
to $21.1 million in fiscal 1994 from $17.2 million in fiscal 1993 and $10.6
million in fiscal 1992. For the nine months ended December 31, 1994 export
product sales increased to $23.6 million from $15.1 million in the prior year
period. Export product sales as a percentage of total product sales were 60% in
fiscal 1994, 61% in fiscal 1993 and 56% in fiscal 1992. For the nine months
ended December 31, 1994, export product sales as a percentage of total product
sales increased to 69% from 59% in the prior year period. During fiscal 1994 and
1993, Target sold products in Japan through a joint venture formed with CMI.
Sales to the Japanese market in fiscal 1994 and 1993 accounted for approximately
29% and 27%, respectively, of product sales. Sales of Target's products in Japan
through its former distributor accounted for approximately 21% of Target's
product sales in fiscal 1992.
 
     Target's continued revenue growth is subject to a number of factors,
including new product introductions, the availability of suitable alternative
products manufactured by competitors, the timeliness and availability of
regulatory clearance and the continued expansion of its customer base. Target
continues to research and develop new applications for its products in an effort
to expand its practitioner customer base. As more companies become aware of the
market potential of such products, Target anticipates an increase of competitive
forces which may have an adverse effect on revenues of Target. Several companies
in the United States have introduced products that are being used in the
interventional neuroradiology market. Target is also aware of other companies
that may pursue commercialization of products which may compete with Target's
products and may result in future pricing and margin pressures within this
market. Prior to commercialization in the United States, sales of certain of
Target's products, including the Guglielmi Detachable Coil ("GDC") system are
limited to clinical settings pursuant to Investigational Device Exemptions
("IDE"s) granted by the FDA which limit the number of patients treatable with
such products. Target must obtain clearance from the FDA to market these
products for other than clinical investigation, and the overall review time of
such regulatory process has apparently increased. Regulatory requirements vary
in other countries in which Target markets its products. Failure to develop new
products successfully or to obtain regulatory clearance for such products,
including Target's detachable coil systems, in a timely manner may have an
adverse effect on Target's revenues in the future. Target's revenue growth may
also be adversely affected by the limited number of teaching hospitals that
train practitioners in fields in which Target's products are utilized. Target
continues to obtain a significant amount of its revenues from one customer in
Japan. Should this customer continue to represent a significant portion of
revenues, significant changes in this customer's ordering rates will likely
cause similar changes in Target's revenues. It is Target's understanding that
physicians use certain devices, products and materials manufactured by other
companies in conjunction with the use of certain of Target's products.
Reductions in the availability or the elimination of such complementary products
have had and may continue to have an adverse effect on sales of Target's
products. This is believed to have been a contributing factor to the decrease in
the percentage of total revenues derived from domestic sources during the past
several quarters. Currently, products sold commercially in the United States
pursuant to 510(k) clearance by the FDA may generally be marketed in Europe.
However, political and regulatory changes, particularly in Western Europe in
connection with the formation of the European Union, as well as the future
impact of IS09000 standards may adversely affect Target's product sales in
Europe. Similarly, changes in the United States and foreign national health care
policies, including third-party reimbursement issues, may have a significant
adverse effect on revenues of Target. Furthermore, the future rate of Target's
revenue growth, if realized, may be below that experienced in prior annual and
quarterly periods.
 
     In October 1994, Target acquired certain assets and liabilities of the
former distributor of Target's products in Germany. Target has formed a
subsidiary that is responsible for the direct sales operations of Target in
Germany. As a result, Target anticipates that future sales to end-users in
Germany will be at prices higher than those of sales to the former distributor,
reflecting the markup previously realized only by the distributor. Two months of
such sales activity are reflected in the three month period ended December 31,
1994.
 
     Cost of Sales.  Cost of sales as a percentage of product sales was 38% for
fiscal 1994 compared to 34% and 36% for fiscal 1993 and 1992, respectively. For
the nine month period ended December 31, 1994, cost of sales as a percentage of
product sales decreased to 32% from 40% in the prior year period. Included in
cost of
 
                                       13
<PAGE>   142
 
sales for fiscal 1994 and the nine months ended December 31, 1993 was a charge
for the estimated costs associated with changes being made to the GDC system as
described below. Excluding the GDC charge, cost of sales was $11.9 million, or
34% of product sales for fiscal 1994 and $8.6 million, or 34% of products sales
for the nine months ended December 31, 1993. Target's increased manufacturing
efficiency, primarily due to increased production volume, was offset primarily
by the commencement of sales of products manufactured by other companies which
are sold by Target at lower gross margins. In addition, the commencement of the
direct sales operation in Germany contributed to the improvement in cost of
sales as a percentage of revenues for the nine months ended December 31, 1994.
Target believes that the reduction in cost of sales as a percentage of product
sales from fiscal 1992 to 1993 is attributable to several factors, including
commencement of sales to CMI at higher gross margins than had been realized with
the prior Japanese distributor, the price increases discussed above, and
increased manufacturing volume as a result of Target's move to its current
facility in fiscal 1993 which resulted in improved productivity. Generally,
there can be no assurance that cost of sales as a percentage of revenues will
show improvement in future periods over current or prior periods due to the
distribution by Target of certain products at lower gross margins, fluctuation
in manufacturing production levels, potential increases in certain costs
associated with the use of third-party technology and potential pressure on
product prices as a result of competition. As a result of the direct sales
operation in Germany described above, a slight improvement in cost of sales as a
percentage of revenues derived from sales in such country will likely be
included in future period results. In addition, although no supply issues have
arisen in the past, there can be no assurance that current or future suppliers
of Target's raw materials will be able to continue to meet the quality and
quantity demands of Target at current suppliers' prices.
 
     Target's GDC system is an investigational device that is currently being
sold to a limited number of clinical investigators pursuant to an IDE. In
October 1993, Target announced that it was pursuing certain changes to the GDC
system as a result of magnetic resonance imaging ("MRI") tests which indicated a
potential for the creation of small metallic particles during the electrolytic
detachment of the coil. Upon completion of certain laboratory tests of these
changes a supplement to the existing IDE was filed with the FDA in January 1994
and approved in March 1994. The revised IDE protocol submitted to the FDA by
Target required commencement of limited clinical trials for the modified GDC
system. Target has exchanged modified product for any original product that
customers still had in their inventory as treatment sites were converted to the
modified product. The limited clinical trials in the United States were
commenced in April 1994. The clinical trials with the modified GDC system have
shown an apparent reduction in both the frequency of the occurrence and the size
of these microscopic particles. The results of these clinical trials were then
included in a new application for 510(k) clearance for the modified GDC system,
which Target submitted in March 1995. Results of the clinical investigations of
both the original GDC system, for which the 510(k) application was withdrawn,
and the modified GDC system were included as supporting data in its March 1995
510(k) application. Target anticipates that this application, which includes
clinical data on approximately 800 patients, will be reviewed by advisory
consultants to the FDA, some of whom may also be members of other FDA panels.
This review may increase the overall length of the regulatory review period.
Regulatory clearance to market the modified product in France was obtained
during the quarter ended December 31, 1994, and Target is currently pursuing
regulatory clearance in Japan for such product.
 
     Target has provided for the estimated costs of exchanging customer's
inventory and disposition of Target's remaining inventory of original GDC
product. A $1.5 million charge was included in cost of sales for the nine months
ended December 31, 1993. The effect of this charge on net income after benefit
for income taxes was approximately $975,000, or $.14 per share. Although Target
does not anticipate a recurrence of the $1.5 million charge, no assurance can be
given that similar incidents will not occur in the future with respect to the
GDC system or other Target products.
 
     Research and Development.  Research and development ("R&D") expense, which
includes expenditures for regulatory compliance and quality assurance, increased
17% to $7.6 million in fiscal 1994 compared to $6.5 million in fiscal 1993. R&D
expense increased 49% in fiscal 1993 from $4.3 million in fiscal 1992. For the
nine months ended December 31, 1994, R&D expense increased 37% to $7.5 million
from $5.5 million in the prior year period. Target attributes the increased
amounts expended for R&D primarily to the expenses incurred in collecting
clinical data, preparing regulatory filings for new products and expansion of
its research
 
                                       14
<PAGE>   143
 
activities and pilot manufacturing line. The pilot manufacturing line was
developed to aid in the transition between the new product development and
manufacturing stages of production. As a percentage of product sales, R&D
expense was 22% for fiscal 1994 compared to 23% for both fiscal 1993 and 1992.
This decrease is primarily attributable to increased revenues and a
slower-than-anticipated increase in the number of R&D personnel. R&D expense was
22% and 21% of revenues for the nine-month periods ended December 31, 1994 and
1993, respectively. This increase is primarily attributable to increased
headcount in addition to the factors described above.
 
     Target believes that its investments in product development and engineering
and manufacturing processes are essential to enable it to maintain its
competitive position. Furthermore, Target believes that such investments enhance
its ability to continue to attract qualified engineers which Target believes is
critical to the continued development of future products. Target expects to
continue to make substantial expenditures on new product development and to
continue to increase the dollar amount expended for R&D in the foreseeable
future.
 
     Selling, General and Administrative.  Selling, general and administrative
("SG&A") expense for the year ended March 31, 1994 increased to $9.2 million
from $7.5 million and $5.4 million for the years ended March 31, 1993 and 1992,
respectively. For the nine months ended December 31, 1994, SG&A expense
increased to $9.6 million from $6.9 million in the prior year period. As a
percentage of product sales, SG&A expense was 26%, 27% and 29% in fiscal 1994,
1993 and 1992, respectively, and 28% and 27% in the nine months ended December
31, 1994 and 1993, respectively. The increase in the amount expended was
primarily due to additional staffing, including sales and management personnel,
to expand the corporate infrastructure, to support the growth in Target's
product sales and, with respect to the nine months ended December 31, 1994,
expenses associated with the commencement of operations in Germany. Target
currently anticipates that the dollar amount expended will continue to increase
primarily due to the recent commencement of direct operations in Germany as
described above (including costs associated with the additional headcount and
marketing operations and the amortization of purchase price in excess of the
fair value of the net tangible assets acquired), additional expenses associated
with a legal action filed by Target to protect certain of its proprietary assets
and planned increases in sales and support staff to introduce, market and
support anticipated new products for which increased physician training and
education, clinical field work and sales support will be required. These
expenses may also increase as Target pursues the feasibility of additional
operations overseas.
 
     Income from Operations.  Income from operations was $5.1 million in fiscal
1994, an increase of 16% from $4.4 million in fiscal 1993. This increase is
attributable to increased product sales and slightly lower R&D and SG&A expenses
as a percentage of product sales over the previous year. These reductions have
been partially offset by the charge to cost of sales for estimated costs
associated with the changes to the GDC system as described above. Income from
operations increased to $4.4 million in fiscal 1993 from $3.7 million in fiscal
1992. The increase was primarily a result of increased revenue in fiscal 1993, a
reduction from 1992 to 1993 in cost of sales as a percentage of product sales
and decreased SG&A expenses as a percentage of product sales. The favorable
changes were partially offset by the absence of revenue from a research partner
in fiscal 1993, while $1.4 million of such revenue was recorded in fiscal 1992.
 
     For the nine-month period ended December 31, 1994 income from operations
increased to $6.3 million compared to $3.0 million for the same period of the
prior year. This increase is primarily attributable to the charge for the GDC
system taken in the prior year as described above, increased revenues and lower
cost of sales as a percentage of revenues compared to the prior year periods as
described above.
 
     Although Target has experienced revenue growth since its inception and has
been profitable on a quarterly basis since the quarter ended December 31, 1990,
no assurance can be given that revenue growth or profitability on a quarterly or
annual basis will be sustained. Target's results of operations have varied
significantly from quarter to quarter, and revenue growth rates have been
inconsistent. Future operating results will depend upon several factors in
addition to those discussed above, including the timing and amount of expenses
associated with expanding Target's operations both domestically and
internationally, increased revenues and expenses in conjunction with Target's
German operations, Target's ability to successfully meet new product development
plans, success in achieving regulatory clearance for new products (including
Target's detachable coil systems) in a timely manner, the acceptance of new
product introductions both in the
 
                                       15
<PAGE>   144
 
United States and internationally, the mix between pilot production of new
products and full-scale manufacturing of existing products, the mix between
domestic and export sales, the availability of complementary products and the
effects this may have particularly on domestic sales, possible changes in
ordering patterns of its customers due to changes in the business environment or
to potential variations in foreign exchange rates, Target's ability to continue
to attract qualified engineers to further the development of future products,
potential future partnering arrangements, changes in the domestic and foreign
health care policies (including third-party reimbursement issues), increased
competitive forces, developments in Target's ongoing intellectual property
litigation, increased expenses associated with protecting Target's proprietary
assets and the general litigious nature of the medical device industry. Target
also believes that seasonal patterns, including a reduction in the number of
procedures performed by physicians using Target's products during summer and
holiday periods, may affect its quarterly revenue stream. In addition, Target
cannot predict ordering rates by distributors, some of which place infrequent
stocking orders while others order at regular intervals. As a result of these
and other factors, Target expects to continue to experience significant
fluctuations in its quarterly operating results.
 
     Target's Common Stock price has been and may continue to be subject to
significant volatility, particularly on a quarterly basis. Any shortfall in
revenues or earnings from levels expected by securities analysts could have an
immediate and significant adverse effect on the trading price of Target's Common
Stock in any given period. Finally, Target participates in a highly dynamic
industry, which often results in significant volatility of Target's Common Stock
price.
 
     Interest and Other Income.  Net interest income increased to $954,000 in
fiscal 1994 compared to $890,000 in fiscal 1993. For the nine month period ended
December 31, 1994, net interest income increased to $921,000 from $682,000 for
the prior year period. These increases are primarily attributable to increased
amounts of cash generated from operating activities which were available for
investment. The increase in net interest income to $890,000 in fiscal 1993 from
$297,000 in fiscal 1992 is attributable to an increase in cash, cash equivalents
and short-term investments resulting from Target's initial public offering of
its common stock in January 1992, the proceeds of which were invested for only a
portion of fiscal 1992. Target expects that interest rates obtainable in the
remainder of fiscal 1995, for the quality of cash investments it seeks, are
unlikely to exceed significantly the rates obtained in recent periods and,
therefore, does not expect significant increases in interest income in the
foreseeable future.
 
     Other income increased to $515,000 in fiscal 1994 from $16,000 in fiscal
1993. Target had no other income in fiscal 1992. Other income for the nine month
period ended December 31, 1994 increased to $973,000 from $276,000 in the same
period of the prior year. The increase from fiscal 1993 to 1994 is due, in part,
to $445,000 received in fiscal 1994 pursuant to the management agreement with
the Japanese joint venture whereby Target was required to provide certain
services during calendar 1994 for which the joint venture paid Target a total of
$700,000. The increase in the nine-month data is primarily due to increased
equity earnings in Target's Japanese joint venture and to $85,000 recognized
during each of the first three fiscal 1995 quarters pursuant to the management
agreement described above. Also included in other income is Target's portion of
equity losses in unconsolidated subsidiaries for which Target's interest is less
than 50% and which are accounted for on the equity method. Target anticipates
that other income may decrease during the remainder of fiscal 1995 and the next
fiscal year due to expected lower earnings in Target's Japanese joint venture as
a result of anticipated price increases to Target's Japanese distributor and the
recognition of increased equity losses resulting from anticipated additional
investments by Target in its less than 50% owned subsidiaries to further the
development of these companies' products.
 
     Provision for Income Taxes.  Target's combined effective federal and state
tax rate was approximately 34% in fiscal 1994 compared to 33% and 38% in fiscal
1993 and 1992, respectively. The fiscal 1994 and 1993 rates reflect the benefits
derived from Target's foreign sales corporation, research credits and certain
nontaxable investment income. For the nine months ended December 31, 1994 and
1993, Target's income tax provision has been calculated based upon the estimated
annual effective tax rate for the fiscal years ending March 31, 1995 and 1994,
respectively, and reflects the benefits derived from Target's foreign sales
corporation, research credits and certain nontaxable investment income. A
revision of such estimate during the third quarter of fiscal 1995 resulted in a
reduction of the estimated effective rate for fiscal 1995 to 36% from
 
                                       16
<PAGE>   145
 
the previous estimate of 37%. Target anticipates a significant reduction in its
estimated effective rate for fiscal 1995 due to increased benefits derived from
foreign tax credits generated in Japan as a result of certain changes with
respect to Target's ownership of its Japanese joint venture in the fourth
quarter of fiscal 1995.
 
     Effective April 1, 1993, Target adopted Financial Accounting Standards
Board Statement 109, "Accounting for Income Taxes." As permitted by Statement
109, Target elected to report the cumulative effect of the change currently
rather than restate the financial statements of prior years. The positive
cumulative effect of the change in method of accounting for income taxes of
$631,000 was recorded in the first quarter of fiscal 1994. Target has considered
the evidence supporting the realizability of net deferred tax assets at March
31, 1994 including carrybacks, future reversal of temporary differences and
future taxable income exclusive of temporary differences, and has recorded a
valuation allowance of $490,000 to reduce the net deferred tax assets to the
amount that is more likely than not to be realized.
 
     Target's provision for income taxes for periods prior to February 1, 1992,
was determined based upon Tax Allocation Agreements with Collagen. Such
provision may not reflect Target's actual tax rate had it not been consolidated
with Collagen for tax purposes. Consequently, Target has presented on the face
of Target's statement of income unaudited pro forma net income and pro forma net
income per share for fiscal 1992 assuming Target filed its tax returns on a
separate company basis. For the period February 1, 1992 through March 31, 1994,
Target's federal and state income tax provisions are calculated on a separate
company basis.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     At December 31, 1994, Target had working capital of approximately $43.1
million and its principal sources of liquidity consisted of approximately $36.4
million in cash, cash equivalents and short-term investments, cash provided by
operating activities and $3.0 million available under a line of credit which
expires in July 1996. At December 31, 1994, no amounts were outstanding under
this line of credit. Net cash provided by operating activities for the nine
months ended December 31, 1994 was $4.3 million.
 
     Inventories increased to $5.0 million at December 31, 1994 (including
inventories held at the German subsidiary location) compared to $3.0 million at
March 31, 1994. The increase is primarily attributable to the products
introduced during the last year resulting in a broader product range for which
inventories are maintained to meet customer demand and increased revenue levels.
Accounts receivable increased to $8.9 million at December 31, 1994 compared to
$6.4 million at March 31, 1994 due primarily to the increased sales volume in
the third quarter of fiscal 1995 and to the consolidation of accounts receivable
of the new German subsidiary described above. Other assets increased to $6.2
million at December 31, 1994 from $3.0 million at March 31, 1994 primarily due
to the net effect of equity accounting for Target's joint venture and
unconsolidated subsidiaries, increased investments in unconsolidated
subsidiaries and increased long-term receivables from less than 50% owned
subsidiaries pursuant to lease-line agreements with Target as lessor. Target
anticipates making additional investments in its less than 50% owned
subsidiaries during the final quarter of fiscal 1995 of up to an aggregate of
approximately $750,000 and approximately $200,000 of additional lease-line
drawdowns. Target currently expects to purchase approximately $3.5 million of
capital equipment in fiscal 1995 of which purchases and commitments totaling
approximately $2.9 million had been made at December 31, 1994.
 
     Target expects to invest $1.7 million in fiscal 1996 to substantially
upgrade its information systems infrastructure. This upgrade is expected to
improve customer service turnaround times and better materials planning. There
can be no assurance that this project will be completed successfully or in a
timely manner, or that the project will not result in disruptions in Target's
operations and it is unlikely that these improvements will result in increased
revenues or profits in the near term if at all.
 
     Target believes that available cash, cash equivalents and short-term
investments, as well as funds expected to be generated from operations, will be
sufficient to meet Target's operating expenses and cash requirements for the
foreseeable future.
 
                                       17
<PAGE>   146
 
                               BUSINESS OF TARGET
 
GENERAL
 
     Target develops, manufactures and markets disposable and implantable
medical devices used in minimally invasive procedures to treat vascular diseases
of the brain associated with stroke and other disease sites accessible through
small vessels of the circulatory system. Interventional physicians can navigate
Target's variable stiffness micro-catheters and guidewires through tortuous
blood vessels not accessible using conventional catheters. Target's products are
used to treat diseased, ruptured or blocked blood vessels in the brain
responsible for stroke, the third leading cause of death in the United States.
One of these products, the GDC system, is being used in clinical trials to treat
and prevent the rupture of cerebral aneurysms. Target has recently submitted a
510(k) application to the FDA covering the GDC system. Target's products are
also used in regions of the body other than the brain. Target's products are
used prior to or in lieu of surgery and can significantly reduce procedural
trauma, complexity, risk to the patient, cost and recovery time. Target markets
its products through a direct sales force in North America and internationally
through a network of 30 specialty distributors, its German subsidiary, Target
Therapeutics International GmbH, and its joint venture in Japan with Century
Medical, Inc. ("CMI"), a subsidiary of ITOCHU International, Inc.
 
TARGET STRATEGY
 
     Target's strategy consists of the following principal elements:
 
     - Focus Primarily on Neurovascular Disorders.  Target focuses its resources
       primarily on developing products for the minimally invasive treatment of
       neurovascular disorders associated with stroke. Acute stroke is the third
       leading cause of death in the United States and a major cause of
       long-term disability. Target's micro-catheters and guidewires are
       specially designed to access the tortuous vascular system of the brain
       for delivery of therapeutic agents and devices, such as its micro-coils,
       and chemotherapeutic drugs. Target believes that its GDC system, which is
       currently in clinical trials, can provide minimally invasive treatment
       for cerebral aneurysms.
 
     - Apply Proprietary Technology in Specialized Applications.  In addition to
       treatment of neurovascular disorders, Target also seeks to apply its
       technology in other areas, including access to small peripheral vessels,
       reproductive physiology, vascular stent-graft products and
       electrophysiology. Target pursues these opportunities directly and, in
       areas outside Target's core business focus, through affiliated companies.
       Target expects that in the future it may also pursue such opportunities
       through strategic alliances with other companies.
 
     - Emphasize Technology, Innovation and Leadership.  Target has substantial
       design, manufacturing and applications engineering expertise in the
       development of small vessel access and delivery systems. Target has
       developed proprietary techniques and customized equipment to extrude and
       process its micro-catheters, as well as proprietary processes to grind
       its guidewires to precise specifications. Target has obtained a number of
       patents on its products, including its variable stiffness micro-catheter
       shaft design, and has other patent applications pending.
 
     - Maintain Close Relationships with Leading Practitioners
       Worldwide.  Target maintains close relationships with leading
       interventional neuroradiologists and neurosurgeons worldwide who are
       dedicated to expanding the use of interventional neurovascular
       techniques. Target works closely with interventional physicians to
       identify potential new applications for product development. Target's
       objectives include increasing the number of interventional practitioners
       and promoting new ideas for the intravascular treatment of disease.
       Target actively supports fellowship programs in the United States that
       provide training in interventional techniques.
 
PRODUCTS
 
     Target's products include micro-catheters and guidewires, micro-coils and
vascular angioplasty products. All of Target's products are intended for single
use and are either disposed of or, in the case of micro-coils, remain in the
patient after the procedure.
 
                                       18
<PAGE>   147
 
     MICRO-CATHETERS AND GUIDEWIRES
 
     Target's micro-catheters and guidewires are used to access small vessels in
the circulatory system. A catheterization procedure typically involves the
insertion of a guidewire through a needle puncture into the easily accessible
femoral artery of the upper leg. A large diameter guidewire is pushed through
the vasculature of the circulatory system and a large guiding catheter is then
advanced over the guidewire so that the tip of the guiding catheter reaches the
appropriate large artery. The guidewire is then removed. To access the
vasculature of the brain, Target's guidewires and micro-catheters are advanced
through the large guiding catheter to a blood vessel in the neck and then pushed
through the guiding catheter tip. Using x-ray imaging to monitor positioning,
the interventional physician alternately advances the guidewire and
micro-catheter through blood vessels in the brain to the diseased site. These
blood vessels are smaller than those in the neck and are typically characterized
by numerous acute curves. After the micro-catheter is positioned, the guidewire
is removed to allow the infusion of diagnostic, embolic or other therapeutic
agents through the micro-catheter directly to the diseased site.
 
     Several design characteristics enable Target's guidewires to be manipulated
and maneuvered through small tortuous blood vessels to allow its micro-catheters
to access the diseased site. These include (i) gradual transitioning of
guidewire stiffness to provide a flexible, atraumatic tip and a more rigid
handle for manipulation and advancement, (ii) torqueability to permit steering
of the guidewire by the interventional physician (through manipulation of the
angled tip of the guidewire) into side-branch vessels, (iii) lubricious
guidewire surface coating to reduce friction as the catheter is advanced over
the guidewire, and (iv) tip radiopacity to enable the physician to view the
device under x-ray imaging. Target's Taper, Seeker and Dasher guidewires allow
the interventional physician to use a guidewire specifically designed and
engineered to match the challenges of the vasculature being catheterized.
Target's Taper guidewire is made of a precision ground, tapered stainless steel
core with a wrapped platinum coil tip. The Taper is Target's most steerable
guidewire and is typically used to provide initial access to the tortuous
vascular anatomy. The Seeker and Dasher guidewires are more flexible than the
Taper, incorporating coatings that enhance smooth tracking of Target's
micro-catheters over the guidewire. Target's guidewires range in size from 0.010
inches to 0.022 inches in diameter and are often used sequentially in a
procedure. For example, to access remote sites, an interventional physician
could first use a Taper, followed by a Seeker or Dasher.
 
     To navigate the complex vascular anatomy of the brain and other regions
remote from large arteries, Target's micro-catheters must be rigid enough to be
pushed as much as five feet through the circulatory system, yet flexible enough
to track over a guidewire without injuring the blood vessel. All of Target's
micro-catheters utilize Target's variable shaft stiffness design, which is a
patented design feature of Target's Tracker catheters. Target's micro-catheters
are highly flexible at the leading (distal) end, have a slightly stiffer middle
section and are stiffer still at the trailing (proximal) end. Target believes
that this design enables the interventional physician to navigate tortuous
vessels that cannot practically be navigated by a catheter not incorporating
variable stiffness. Target's largest selling micro-catheter, the Tracker, is
manufactured in diameters ranging from 0.026 to 0.062 inches and in a variety of
lengths. After accessing a diseased site, Target's micro-catheters may be used
by the practitioner to treat the disease by delivering various diagnostic or
therapeutic agents or embolic devices such as Target's micro-coils.
 
     The newest addition to Target's family of Tracker catheters is the
FasTRACKER, which incorporates a proprietary chemically bonded hydrophilic
polymer that allows the micro-catheter to glide more easily through the
circulatory system, possibly resulting in shortened procedure times. Market
clearance for the FasTRACKER has been obtained in the United States and Japan.
 
     The Soft Stream micro-catheter incorporates perforations on the sides of
the distal end for more effective infusion of diagnostic and therapeutic agents.
Guidewire tracking of the Soft Stream micro-catheter into small tortuous blood
vessels is enhanced by the varied stiffness of the catheter shaft. The flexible
distal end of the Soft Stream micro-catheter is intended to minimize trauma to
occluded vessels, such as saphenous (coronary bypass) vein grafts. The catheter
may remain in the vessel for several hours to permit continuous infusion of
clot-dissolving (thrombolytic) drugs.
 
                                       19
<PAGE>   148
 
     Target also markets a number of flow-assisted micro-catheters that
incorporate a highly flexible shaft material and are designed to access diseased
sites characterized by rapid blood flow. Using the "flow-assisted" technique,
the interventional physician advances the micro-catheter without a guidewire and
allows the blood flow to assist in positioning the catheter. In certain cases,
this technique enables interventional physicians to maneuver more quickly
through rapid flow vessels than would be possible using micro-catheters that
track over guidewires. In June 1993, Target introduced a redesigned Zephyr
flow-assisted micro-catheter. In August 1992, Target entered into an agreement
with Balt Extrusion of Paris, France ("Balt") pursuant to which Target agreed to
obtain the necessary regulatory clearance for Balt's neurological products and
to promote and distribute such products on an exclusive basis in the United
States and Canada. The products distributed by Target include Balt's Magic line
of flow-assisted catheters, guiding catheters and catheter valve introducers.
 
     Target's Retriever endovascular snare is designed to retrieve objects in
the cerebral, peripheral and coronary vasculature. The Retriever combines a
guidewire and variable stiffness catheter to allow access to remote, tortuous
vasculature. The distal end of the guidewire is radiopaque and is attached to
the distal end of the catheter, forming a loop. By extending or retracting the
guidewire through the catheter, the interventional physician can adjust the size
of the loop to encircle and grasp the desired object. Target introduced the
Retriever endovascular snare in June 1992.
 
     Target's micro-catheters range in domestic list price from $140 to $340,
and its guidewires range in domestic list price from $120 to $180. In a typical
procedure involving difficult-to-access vessels, multiple Target micro-catheters
and guidewires may be used.
 
     For the nine months ended December 31, 1994 and the fiscal years ended
March 31, 1994, 1993 and 1992, sales of Target's micro-catheters accounted for
approximately 50%, 52%, 49% and 49%, respectively, and sales of Target's
guidewires accounted for approximately 20%, 22%, 24% and 30%, respectively, of
Target's product sales during such periods.
 
     The following table shows Target's principal micro-catheter and guidewire
products and indicates significant applications for which such products are
used.
 
<TABLE>
<CAPTION>
                                        CURRENT   DATE FIRST
                                        NUMBER      MODEL
                                          OF      INTRODUCED             FDA CLEARED                 REPRESENTATIVE
             PRODUCT LINE               MODELS     IN U.S.             INDICATIONS(1)            CLINICAL APPLICATIONS
--------------------------------------- -------   ----------   -------------------------------  ------------------------
<S>                                     <C>       <C>          <C>                              <C>
MICRO-CATHETERS
Tracker Infusion Catheter                  8      Oct. 1986    Neurovascular, general vascular  Delivery of diagnostic
                                                               and cardiovascular infusion      and therapeutic agents
Tracker Soft Stream Infusion Catheter      2      Dec. 1991    General vascular and             Delivery of diagnostic
  and Micro Soft Stream with Hydrolene                         cardiovascular infusion          and therapeutic agents
Retriever Endovascular Snare               2      June 1992    General vascular use             Retrieval of foreign
                                                                                                objects in small vessels
Zephyr Flow-Assisted Catheter              1      June 1993    Neurovascular and general        Delivery of therapeutic
                                                               vascular infusion                agents
FasTRACKER Infusion Catheter               4      Aug. 1993    Neurovascular, general vascular  Delivery of diagnostic
                                                               and cardiovascular infusion      and therapeutic agents
Balt Magic Flow-Assisted Catheter          4      Sept. 1993   Neurovascular infusion           Infusion of contrast
                                                                                                materials
FasGUIDE Guiding Catheter                  2      Nov. 1994    General vascular use             Conduit for other
                                                                                                medical devices and
                                                                                                infusion of diagnostic
                                                                                                agents
GUIDEWIRES
Taper Steerable Guidewire                  5      July 1987    Neurovascular, general vascular  Assist in placement of
                                                               and cardiovascular use           therapeutic and
                                                                                                diagnostic catheters(2)
Seeker Steerable Guidewire                 3      Dec. 1988    Neurovascular, general vascular  Assist in placement of
                                                               and cardiovascular use           therapeutic and
                                                                                                diagnostic catheters
Dasher Steerable Guidewire                 2      June 1992    Neurovascular, general vascular  Assist in placement of
                                                               and cardiovascular use           therapeutic and
                                                                                                diagnostic catheters
</TABLE>
 
---------------
 
(1) Not all models are cleared for all stated indications.
 
(2) Pursuant to an agreement with Eli Lilly and Company, Target cannot market
    this product for use in coronary angioplasty applications. See "-- Patents,
    Trade Secrets and Licenses."
 
                                       20
<PAGE>   149
 
     MICRO-COILS
 
     Target's family of micro-coil products includes micro-coils that are pushed
through a catheter for delivery to a diseased site, and micro-coils that are
mechanically detached or released in applications and procedures where highly
precise coil placement is necessary.
 
     Target's pushable coils include complex helical and straight platinum
coils, and Braided Occlusion Devices. Target's complex helical and straight
platinum micro-coils are designed to be inserted through a Tracker
micro-catheter to occlude the diseased area of a blood vessel. These micro-coils
are placed by positioning the distal tip of a Tracker micro-catheter at the
desired delivery site and pushing the micro-coil through the catheter and out
the tip with a coil pusher. Target's complex helical coils, when released, twist
and take on a complex shape to fill and block the diseased vessel. Target's
micro-coils are used to treat arteriovenous malformations ("AVM"s), which are
aberrant interconnections of arteries and veins. In these cases, Target's
micro-coils are delivered to the diseased region to block blood vessels and
restrict blood flow. This allows for surgical removal of the AVM with
significantly reduced blood loss. Many models of Target's micro-coils
incorporate polyester fibers to enhance space filling and promote occlusion.
Target's micro-coils vary in length and shape, and range in domestic list price
from $160 to $370 for a box of five. Target has also developed its Braided
Occlusion Devices, all of which are densely covered with polyester fibers and
are manufactured in relatively simple shapes. The greatly increased density of
polyester fibers, relative to Target's other micro-coil products, promotes
occlusion.
 
     Target's mechanically detachable coils include its GDC system, which
provides detachment through electrolysis, and its Interlocking Detachable Coil
("IDC") system, which provides detachment through release of an interlocking
mechanical coupling.
 
     Target is clinically testing its GDC system for the treatment of
neurovascular aneurysms, which are balloon-like enlargements stemming from
weakened vessel walls. The GDC system is currently being sold, in accordance
with cost-recovery provisions of applicable regulations, to a limited number of
clinical investigators pursuant to an Investigational Device Exemption ("IDE")
for treatment of patients suffering from high-risk or inoperable cerebral
aneurysms. The GDC system incorporates a micro-coil which is attached to a
delivery wire. This allows a micro-coil to be retracted into the catheter and
then reinserted if initial micro-coil placement is suboptimal. In addition,
movement of the micro-coil is eliminated until detachment, which reduces the
risk that the micro-coil will be dislodged. Precise coil placement is essential
for effective treatment but is difficult to achieve and may require a number of
attempts. If placed improperly in an aneurysm, the micro-coil may become
dislodged or released into the bloodstream. Application of a slight electric
current to the wire produces controlled, electrolytic detachment of a complete
coil system after the micro-coil has been placed precisely in the aneurysm. Once
in place, the GDC system is intended to disrupt blood supply to the aneurysm,
occluding and sealing off the aneurysm from the blood vessel. One patent has
been issued and two additional patents have been applied for with respect to the
GDC system.
 
     In October 1993, Target announced that it was pursuing certain changes to
the GDC system as a result of magnetic resonance imaging ("MRI") tests which
indicated a potential for the creation of small metallic particles during the
electrolytic detachment of the coil. Upon completion of certain laboratory tests
of these changes a supplement to the existing IDE was filed with the FDA in
January 1994 and approved in March 1994. The revised IDE protocol submitted to
the FDA by Target required commencement of limited clinical trials for the
modified GDC system. Target has exchanged modified product for any original
product that customers still had in their inventory as treatment sites were
converted to the modified product. The limited clinical trials in the United
States were commenced in April 1994. The clinical trials with the modified GDC
system have shown an apparent reduction in both the frequency of the occurrence
and the size of these microscopic particles. The results of these clinical
trials were then included in a new application for 510(k) clearance for the
modified GDC system, which Target submitted in March 1995. Results of the
clinical investigations of both the original GDC system, for which the 510(k)
application was withdrawn, and the modified GDC system were included as
supporting data in its March 1995 510(k) application. Target anticipates that
this application, which includes clinical data on approximately 800 patients,
will be reviewed by advisory consultants, some of whom may also be members of
other FDA panels. This review may increase
 
                                       21
<PAGE>   150
 
the overall length of the regulatory review period. Regulatory clearance to
market the modified product in France was obtained during the quarter ended
December 31, 1994, and Target is currently pursuing regulatory clearance in
Japan for such product.
 
     Unlike the GDC, the IDC is not released by an electrical charge but through
mechanical means. Currently, the IDC system is principally marketed in Japan.
Target is currently seeking regulatory clearance to use the IDC in United States
clinical trials for the treatment of fistulae and AVMs.
 
     For the nine months ended December 31, 1994 and the fiscal years ended
March 31, 1994, 1993 and 1992, Target's micro-coil products, including the GDC
system, accounted for 28%, 24%, 26% and 19%, respectively, of Target's product
sales.
 
     The following table shows Target's principal micro-coil products and
indicates significant applications for which such products are used.
 
<TABLE>
<CAPTION>
                                                DATE FIRST
                                     CURRENT      MODEL
                                    NUMBER OF   INTRODUCED             FDA CLEARED                 REPRESENTATIVE
           PRODUCT LINE              MODELS      IN U.S.               INDICATIONS              CLINICAL APPLICATIONS
----------------------------------- ---------   ----------   -------------------------------  -------------------------
<S>                                 <C>         <C>          <C>                              <C>
MICRO-COILS
Complex Helical and Straight          20        Sept. 1989   Neurovascular and peripheral     Embolization of AVMs and
  Platinum Coils                                             vascular occlusion               trauma-induced vessel
                                                                                              rupture
Guglielmi Detachable Coil System      28        (1)          Investigational Device           Aneurysm embolization
                                                             Exemption permitting limited
                                                             regulated clinical trials for
                                                             neurovascular aneurysm
                                                             occlusion
Interlocking Detachable Coil System   14        (2)          None currently                   Embolization of AVMs and
                                                                                              fistulae
Braided Occlusion Device              7         Dec. 1992    Neurovascular and peripheral     Embolizations of AVMs and
                                                             vascular occlusion               trauma-induced vessel
                                                                                              rupture
</TABLE>
 
---------------
 
(1) This product is currently in U.S. clinical trials. See "-- Government
    Regulation and Product Testing" for additional information.
 
(2) Target is currently planning clinical trials for this product, for which an
    application for an IDE has been submitted. The initial applications are
    expected to include embolization of AVMs and fistulae. Target expects to
    include data from the planned clinical trials in a submission to the FDA
    seeking future market clearance.
 
     VASCULAR ANGIOPLASTY
 
     Target has developed its Stealth balloon angioplasty micro-catheters,
including the Fas-
STEALTH (which incorporates a hydrophilic polymer), for use in dilation of
certain arteries of the peripheral vasculature that have become narrowed due to
atherosclerotic disease. These balloon-tipped micro-catheters are inserted into
the vessel system and guided through the arteries over a guidewire to the site
of a blockage, using a technique similar to that used to maneuver Target's other
micro-catheters. The deflated balloon is positioned across the occluded area and
inflated and deflated once or several times, resulting in expansion of the
arterial narrowing to improve blood flow. Target's Stealth balloon angioplasty
micro-catheter utilizes a proprietary single lumen (or channel) design and
incorporates variable shaft stiffness to impart guidewire tracking
characteristics similar to those of the Tracker micro-catheter. Target believes
that other balloon angioplasty catheters are less maneuverable because they
either use a single lumen with a fixed wire or two lumens -- one to track over
the guidewire and a second to allow infusion of liquids to inflate the balloon
located at the tip of the catheter. Target's trackable, single lumen design and
variable shaft stiffness allow the Stealth to track through tortuous vascular
paths. The Stealth is used to dilate arteries in the brain diseased by
atherosclerotic plaque that are not accessible by conventional angioplasty
catheters. The Stealth and FasSTEALTH micro-catheters are each available in five
balloon diameters and have a domestic list price of $650 and $695, respectively.
 
                                       22
<PAGE>   151
 
MARKETS
 
     Interventional Neurology.  Acute stroke is the third leading cause of death
in the United States and a major cause of adult long-term disability. Stroke is
the disruption of blood supply to critical areas of the brain. The reduced blood
flow results in a lack of oxygen to the brain, known as ischemia, and often
causes the loss of normal brain functions. Patients who survive a stroke may
experience partial paralysis or may lose the ability to speak or comprehend
language. Strokes are typically caused either by ruptures (hemorrhagic stroke)
or blockages (vaso-occlusive stroke) of arteries within or leading to the brain.
 
     Hemorrhagic strokes are generally caused by the rupture of arteries
resulting from vascular defects such as cerebral aneurysms or AVMs. Cerebral
aneurysms and AVMs are estimated to occur in one-half of one percent to five
percent of the general population in the United States. Without treatment, these
vascular defects typically grow with time and may cause a variety of symptoms or
may remain asymptomatic until they rupture. In some people, these defects never
become symptomatic or rupture. The treatment of hemorrhagic stroke typically
requires highly invasive neurosurgery, which involves the opening of a portion
of the skull, manipulation of the brain, extensive blood loss, prolonged
hospitalization and a long recovery period.
 
     In the case of aneurysms, neurosurgery is generally performed either before
or after an aneurysm ruptures, although many patients who survive a ruptured
aneurysm are not treated surgically due to the high risk of such surgery.
Approximately 18,000 aneurysm surgeries were performed in the United States in
1989. Target's GDC system, used with a Tracker micro-catheter, is a specialized
micro-coil designed for use in aneurysms and is being investigated in clinical
trials. Target believes the GDC system may in certain cases be an effective,
minimally invasive treatment to lessen blood loss or reduce the risk of a
re-rupture for patients suffering from hemorrhagic stroke due to ruptured
aneurysms, or as prophylactic treatment for nonsurgical patients by embolizing
aneurysms prior to rupture.
 
     Approximately 4,000 AVMs were surgically removed in the United States in
1989. Target's micro-coils enable interventional physicians to occlude AVMs
prior to surgery. After occluding the vessels of or leading to an AVM, the
neurosurgeon may perform surgery to remove the abnormal vasculature more rapidly
and with significantly less blood loss than if the surgery was performed without
first using the micro-coil, greatly reducing the attendant surgical risks. In
some cases, the micro-coils may occlude the AVM completely and highly-invasive
surgery can be avoided.
 
     Vaso-occlusive stroke is typically caused by the existence of a blood clot
within an artery causing a complete blockage of blood flow or by the narrowing
of blood vessels due to the formation of atherosclerotic plaque on the inside of
vessel walls, causing a reduction in the flow of blood and increasing the risk
that a blood clot will cause a complete blockage.
 
     There are a number of conventional treatments for cerebral atherosclerotic
disease. Pharmacologic treatment using drugs to dilate narrowed vessels often
has limited effectiveness, especially in highly diseased blood vessels. Vascular
surgery to remove the atherosclerotic tissue within a diseased artery has proven
to be somewhat more effective but currently is limited to blood vessels within
the neck. Arteries within the brain are generally too small and difficult to
reach for this procedure and have typically been treated by highly invasive
bypass grafting techniques. Balloon angioplasty, which is considered to be less
invasive and more cost-effective as a means of treating coronary
atherosclerosis, has not been used extensively to treat cerebral atherosclerosis
primarily due to the limitations of standard catheter systems. The Company is
not aware of any balloon catheter currently on the market indicated for cerebral
angioplasty. Target's Stealth micro-catheter has been cleared by the FDA for
performing minimally invasive balloon angioplasty procedures to access and
dilate small vessels of the peripheral vascular system to permit the restoration
of normal blood flow.
 
     The conventional treatment for a cerebral blood clot involves the use of
thrombolytic drugs. However, such drugs appear to be relatively ineffective when
delivered intravenously and may cause significant bleeding in other parts of the
body as a side effect. Certain of Target's catheter products are cleared for
delivery of therapeutic agents, but additional clearances must be obtained with
respect to the use of a particular drug to treat a specific indication.
Similarly, Target believes that its Soft Stream micro-catheter may be used to
deliver certain therapeutic agents through perforations in its side holes
directly to a disease site. By delivering
 
                                       23
<PAGE>   152
 
such agents through the side-hole zone of the micro-catheter, the entire length
of the diseased area can be treated at once, potentially accelerating treatment.
Regulatory clearance of Target's catheter products for site-specific drug
delivery will depend in part on clinical proof of efficacy and safety, and there
can be no assurance that such clinical proof will be obtained. While Target is
aware that others are conducting or planning to conduct such studies, Target
does not currently intend to initiate independent studies in this area.
 
     Peripheral Vascular Intervention.  Target's products are used to treat many
site-specific disorders affecting the peripheral vascular system. These
disorders, which include gastro-intestinal bleeding, peripheral vascular blood
clots, internal bleeding from trauma, and peripheral AVMs and other
malformations, are not easily accessible by conventional catheters and therefore
have traditionally been treated by highly invasive surgery. Tracker
micro-catheters can be used to deliver embolizing agents or devices to address
certain cases of gastro-intestinal bleeding, trauma-induced bleeding or AVMs and
other malformations. Occluded peripheral vessels can be treated by dilation
using a Stealth balloon angioplasty micro-catheter in the case of
atherosclerosis.
 
     Target's infusion micro-catheters are also being used to treat liver
cancer, primarily in Japan where the incidence of that disease is relatively
high. The micro-catheters are used to deliver embolizing agents to the blood
vessels that iced the tumor to reduce or eliminate its blood supply. Although
not curative, such treatment may contribute to an improved quality of life for
such patients.
 
MARKETING AND SALES
 
     Target's marketing strategy is designed to promote awareness of the
clinical efficacy and cost-effectiveness of the minimally invasive
interventional procedures in which Target's products are employed. Target
implements this strategy by providing clinical and technical information to its
sales force and worldwide distributors that encourages the interventionalist to
perform procedures utilizing Target's products. Target places particular
marketing emphasis on physician assistance and support for physician training.
 
     In North America, the typical user of Target's products is the
interventional neuroradiologist. Target believes that the number of
interventional neuroradiologists and neurosurgeons trained to use its vascular
access and delivery products to treat neurovascular disorders is relatively
small and the growth in the number of neuro-interventional physicians is
constrained by the lengthy training programs required to educate these
physicians in the United States. Target supports these programs through
consultation with these practitioners. The expansion of these training programs,
and increased usage of Target's products by these practitioners, are important
factors in the growth of Target's domestic market for treating neurovascular
disorders with its products. In addition, an important source of product
promotion comes from referrals within the medical community. As of December 31,
1994, there were ongoing programs training approximately 30 fellows at 15
teaching hospitals in North America. Target believes that future growth in the
United States market also depends significantly on the unpredictable, costly and
time-consuming process of obtaining regulatory clearance to market its products,
such as the GDC system, which is awaiting regulatory clearance. See
"-- Government Regulation and Product Testing."
 
     Internationally, Target's products are typically used by interventional
neuroradiologists, neurosurgeons, cardiologists and peripheral vascular
radiologists. These practitioners provide peer training, expanding the use of
Target's products. To date, Target is not aware of any formal fellowship
programs outside of the United States. However, there are several interventional
centers where physicians are trained in the field of interventional
neuroradiology.
 
     Future growth of the market for Target's neurovascular micro-catheters,
guidewires and micro-coils will depend upon success in obtaining necessary
regulatory clearances and expansion of the number of trained interventional
practitioners. To the extent that physicians do not adopt these products for use
in treating neurovascular disorders or sufficient physicians are not trained in
the use of Target's products, both in the United States and abroad, the market
for Target's products will remain limited.
 
     Of the 1,500 hospitals in the United States providing interventional
radiology services, approximately 450 provide some treatment for neurovascular
disease. Approximately 100 hospitals in the United States
 
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accounted for a substantial portion of Target's domestic revenues in the fiscal
year ended March 31, 1994. Internationally, approximately 225 centers provide
neurointerventional therapy. In Japan, the majority of cases are performed by
neurosurgeons trained in these techniques.
 
     Sales to customers outside North America are made through a network of 30
international specialty distributors, Target's new German subsidiary and the
Japanese joint venture with CMI, both of which are described below. Target
promotes its products through trade shows, seminars, publications and direct
mailings to interventional practitioners. Export product sales accounted for
69%, 60%, 61% and 56% of total product sales for the nine months ended December
31, 1994 and the fiscal years ended March 31, 1994, 1993 and 1992, respectively.
Target anticipates that product sales to customers in Europe and Japan will
generate a large portion of total product sales through at least fiscal 1996.
Target's international operations are subject to certain risks common to foreign
operations in general, including governmental regulations, reimbursement
practices, and import and export restrictions. Changes in such governmental
regulations or import and export restrictions could adversely affect sales of
Target's products and Target's results of operations. See "Risk Factors Relating
to Target -- Importance of Foreign Sales."
 
     In addition to selling its own products, Target has exclusive rights in the
United States and Canada to distribute Balt's Magic line of flow-assisted
catheters, guiding-catheters and catheter valve introducers. The agreement
between Target and Balt, effective in June 1992, has an initial term of three
years and is renewable at the option of Target for an additional three-year term
if certain sales and regulatory milestones are achieved.
 
     In 1991, Target formed a distribution joint venture with CMI in order to
provide Target a direct presence in Japan. CMI initially contributed
approximately $200,000 for a 100% ownership in the joint venture, and in
November 1992, CMI sold a 50% ownership in the joint venture to Target for
approximately $120,000. The joint venture, Target-CMI, Inc., commenced selling
in Japan certain of Target's products for coronary applications in December 1991
and Target's products for neurology and peripheral vascular intervention in
April 1992. Sales to CMI accounted for approximately 29% and 27% of Target's
product sales for the years ended March 31, 1994 and 1993, respectively.
 
     In October 1994, Target acquired certain assets and liabilities of the
former distributor of Target's products in Germany. Target has formed a
subsidiary that is responsible for the direct sales operations of Target in
Germany.
 
MANUFACTURING
 
     Target's manufacturing organization fabricates certain proprietary
components of Target's products and assembles, inspects, tests and packages all
components into finished products. By designing and manufacturing all of its
products from raw materials, Target believes it maintains greater control of
quality and manufacturing process changes and is better able to limit outside
access to its proprietary technology.
 
     Target believes that its custom-designed, proprietary process equipment is
an important component of its manufacturing strategy. In some cases, Target has
added proprietary software to standard equipment and, in others, has developed
proprietary enhancements for existing production machinery to facilitate the
manufacture of its products to exacting standards. Target has also developed
core manufacturing technologies and processes, including (i) proprietary
extrusion techniques and equipment and polymer processing capabilities,
including composite lamination, welding of dissimilar materials,
balloon-forming, tubing expansion and silicone-coating, and (ii) proprietary
precision guidewire grinding techniques enabling fabrication of a large variety
of guidewire core profiles using many core alloys, thermal treating, variable
pitch spring winding and soldering. Other areas of Target's technological
expertise include braiding, teflon-spray coating, hydrophilic coatings,
electroplating and material cleaning and surface preparation.
 
     Most of Target's subassemblies and products are assembled and tested in a
controlled clean-room environment by trained production personnel. At various
assembly stages each lot of product undergoes thorough testing to ensure
compliance with applicable regulations. Target's quality assurance group
independently verifies that product fabrication and inspection process steps
meet Target's specifications and applicable
 
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<PAGE>   154
 
regulatory requirements. Upon successful completion of these tests, the products
are sterilized, packaged and prepared for shipment.
 
     Raw materials utilized in Target's products are purchased from outside
vendors. Target's manufacturing group procures, tests and inspects all raw
materials used in Target's products. Target relies on single sources for certain
of its key components. Target believes, however, that alternative sources for
these components are available and generally maintains adequate raw material
inventory supply to avoid product flow interruptions. Nevertheless, any
unanticipated interruption in the supply of these components could have a
material adverse effect on Target.
 
PRODUCT DEVELOPMENT
 
     Target's product development strategy is to improve its current products
and to develop new products to meet the needs of physicians performing small
vessel interventional procedures. Target is developing new products and enhanced
versions of its existing products to perform an expanded range of diagnostic and
therapeutic procedures within Target's core interventional neurovascular and
peripheral vascular markets. Target's future success will depend upon, among
other factors, its ability to develop or acquire from third parties, introduce
and manufacture new products or enhanced versions of, or new uses for, existing
products, and to obtain regulatory clearance on a timely basis for such
products.
 
     For the embolization of peripheral aneurysms and AVMs, Target has developed
its IDC coils that are detached by mechanical, rather than electrolytic, means
as described above. The initial intended use of the IDC system is the treatment
of AVMs or fistulae. Target is currently planning clinical trials, the results
of which will be used as support for a future filing with the FDA in order to
obtain market clearance in the United States. The IDC system may have
applications where speed of detachment is important or where a high degree of
accuracy of placement is not as critical. Target has three patents relating to
the IDC system and has acquired rights from a third party with respect to an
IDC. The IDC system is currently being marketed commercially in Japan as the
Mechanical Detachable Coil.
 
     Target believes its technology may be used for applications other than
those currently marketed or currently in Target's product pipeline. For example,
in December 1992, Target formed a partially owned subsidiary, Conceptus, Inc.,
to focus on the diagnosis and treatment of female and male reproductive
disorders such as infertility and impotence. As of December 31, 1994, Target
held an approximate 20% equity position in Conceptus with an option to increase
this ownership position in the future by exercising a warrant for Conceptus
common stock. The warrant is exercisable at any time on or before December 1996
subject to acceleration upon the occurrence of certain events. In return, Target
has granted to Conceptus certain rights to its current and future proprietary
technologies for exclusive use in developing and commercializing products for
application in the field of reproductive physiology. In March 1994, Conceptus
completed a second round of financing.
 
     In May 1993, Target formed another partially owned subsidiary, Cardima,
Inc. ("Cardima"), which is engaged in the development of products for diagnosis
and treatment of cardiac rhythm disorder. As of December 31, 1994, Target held
an equity interest in Cardima of approximately 30%. Target has granted Cardima
certain rights to its current and future proprietary technologies for exclusive
use in developing and commercializing products primarily for electrophysiology
applications.
 
     In June 1993, Target, along with Collagen and Celtrix, formed another
partially owned subsidiary, Prograft Medical, Inc. ("Prograft"), by contributing
cash and granting certain rights to its current and future proprietary
technologies for exclusive use in developing and commercializing products for
applications in the field of vascular prostheses. Prograft is focusing its
development efforts on vascular stents (devices that hold arteries open from
within), grafts (that allow for the repair of narrowed, blocked or weakened
arteries and veins) and stent-grafts. As of December 31, 1994, Target held
approximately 32% of the equity in Prograft. In July and August of 1994,
Prograft partially completed a second round of financing.
 
                                       26
<PAGE>   155
 
     Target's expenditures for research and development totaled approximately
$7.6 million, $6.5 million and $4.3 million in the years ended March 31, 1994,
1993 and 1992, respectively. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations of Target."
 
COMPETITION
 
     The medical device industry is characterized by rapidly evolving technology
and competition. Target currently experiences competition in the interventional
neuroradiology market and expects such competition to increase substantially.
Target believes that procedures using its interventional products, including the
recovery period, are substantially less costly than highly invasive, traditional
surgical procedures and may ultimately replace these procedures in some
applications. In many other applications, Target's products can be used prior to
surgery to enable the physician to perform procedures less invasively, with
greater efficiency and reduced patient trauma in a shorter period of time.
Several companies in the United States, including large companies with resources
significantly greater than those of Target, have introduced products that are
being used in the interventional neuroradiology market. Target is also aware of
other companies that may pursue commercialization of products which may compete
with Target's products and may result in future pricing and margin pressures
within this market. There can be no assurance that these companies will not
succeed in developing technologies and products that are more effective than any
which have been or are being developed by Target or that would render Target's
technologies or products obsolete or not competitive.
 
     The cardiovascular and peripheral vascular interventional markets are
substantially more developed than the neuroradiology market and are subject to
intense competition. There are many large companies with significantly greater
financial, manufacturing, marketing, distribution and technical resources, and
experience than Target focusing principally on cardiovascular and peripheral
applications for their catheter technologies. As a result, Target focuses its
product development and marketing strategies on market segments where Target's
small vessel access and delivery systems can be used in applications not
presently addressed by conventional catheter and other interventional products.
There can be no assurance, however, that competitors will not successfully enter
these markets with superior products. In addition, Target is aware of several
other companies that have introduced guidewires to the marketplace and
attributes the slower growth rate of its guidewire product line to increased
competitive pressures. Such competition could have a material adverse effect on
Target's business, financial condition and results of operations.
 
     Target believes that the primary competitive factors in the market for
interventional small vessel access and delivery products are safety, efficacy,
ease of use, reliability, innovation and price. In addition, Target believes
that customer service and physician relationships, as well as the time in which
companies can develop products, complete the clinical testing and regulatory
clearance process, and supply commercial quantities of the products to the
market are important competitive factors.
 
PATENTS, TRADE SECRETS AND LICENSES
 
     Target's policy is to protect its proprietary position by, among other
methods, filing United States and foreign patent applications to protect
technology, inventions and improvements that are important to the development of
its business. As of March 15, 1995, Target held or was the exclusive licensee of
35 issued United States patents and had 33 United States and numerous foreign
patents issued and applications pending covering various aspects of its products
and core technology. The issued patents relate to the variable stiffness design
of Target's Tracker micro-catheters, the patent for which expires in April 2005,
and other important aspects of Target's technologies. No assurance can be given
that pending patent applications will be approved or that any patents will
provide competitive advantages for Target's products or will not be challenged
or circumvented by competitors. In order to preserve its competitive position,
it is Target's intent to actively pursue any patent infringement issues of which
it becomes aware.
 
     Target also relies upon trade secrets and technical know-how and continuing
technological innovation to develop and maintain its competitive position.
Target typically requires its employees, consultants and advisors to execute
appropriate confidentiality and assignment of inventions agreements in
connection with their employment, consulting or advisory relationship with
Target. There can be no assurance, however, that these
 
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<PAGE>   156
 
agreements will not be breached or that Target will have adequate remedies for
any breach. Furthermore, no assurance can be given that competitors will not
independently develop substantially equivalent proprietary information and
techniques or otherwise gain access to Target's proprietary technology, or that
Target can meaningfully protect its rights in unpatented proprietary technology.
 
     Target was founded in June 1985 as a corporate joint venture between
Collagen and Eli Lilly and Company ("Lilly"). In January 1988, Lilly sold its
interest in Target to Collagen. In connection with the transfer of ownership,
Lilly and its wholly owned subsidiary, Advanced Cardiovascular Systems, Inc.
("ACS"), transferred to Target all rights to certain patents and confidential
information developed through the transfer date by the joint venture.
Additionally, Target granted to Lilly and ACS a royalty-free worldwide license
to make, use and sell products, other than in the field of therapeutic
embolization, under certain patents and know-how relating to the Taper
guidewire. Such license is exclusive, except that Target retained a
non-exclusive, royalty-free worldwide right under such patent rights and
know-how to make, have made, use and sell products, other than in the field of
diagnosis and treatment of coronary angioplasty. Lilly and ACS further agreed
not to assert against Target any intellectual property right relating to
Target's Tracker micro-catheter and Taper guidewire, or any products
substantially similar to such products and for the applications for which such
products were then being used.
 
     In June 1990, Target obtained an exclusive, worldwide, royalty-bearing
license from The Regents of the University of California to certain pending
patent applications relating to the construction and method of use of the GDC
system. The license requires Target to make certain minimum payments and to pay
a royalty based on net sales of products utilizing the licensed technology. This
license extends for the life of the patents unless terminated earlier in the
event of Target's breach of certain covenants or agreements, including failure
to obtain regulatory clearance or market the GDC system within specified
periods. Under the license, the licensor retained the rights to use the
invention and associated technology for educational and research purposes.
 
     In March 1992, Target obtained an exclusive, worldwide, royalty-bearing
license to certain inventions, technical information, know-how and patents which
may issue with respect to an endovascular retrieval device. Target commenced
marketing a product using this technology, the Retriever endovascular snare, in
June 1992. The license requires Target to pay a royalty based on net sales of
products utilizing the licensed technology. The license extends for the life of
the patents, after which Target shall have a royalty-free, paid-up license.
 
     In October 1992, September 1993 and March 1994, Target obtained certain
royalty-bearing licenses to certain inventions, technical information, know-how
and patents with respect to the surface treatment of guidewires, temporary-use
infusion catheters, devices used to introduce other neurovascular catheters or
embolics and for a balloon dilatation catheter. Such licenses are non-exclusive
except for infusion catheters sold exclusively for neurovascular infusion usage.
Target commenced marketing an infusion catheter product line using this
technology, the FasTRACKER product family, during fiscal 1994 and in the third
quarter of fiscal 1995 introduced a line of guide catheters used to introduce
other neurovascular catheters, the FasGUIDE product family, using this
technology. These licenses require Target to make certain minimum payments and
to pay royalties based on net sales of products utilizing the licensed
technology. The licenses extend for the life of the patents but may be
terminated at Target's discretion with no future right to the technology. Target
has not yet commenced sales of guidewires or balloon dilatation products which
use this technology.
 
     In addition to the licenses described above, Target may, in the future,
license from third parties rights to certain products and processes related to
Target's business.
 
     The patent which relates to the variable stiffness design of Target's
Tracker micro-catheters (the "Tracker patent") has been the subject of
reexamination proceedings in the United States Patent and Trademark Office
("PTO"). The first such proceeding was concluded on November 15, 1994, when the
PTO issued a reexamination certificate and confirmed the patentability of the
patent claims set forth in the certificate. The second reexamination of the
patent was initiated by a subsidiary of Boston Scientific Corporation and one of
Target's competitors, SciMed Life Systems, Inc. ("SciMed"), raising new issues
of patentability. A petition for a third reexamination was filed recently by the
same competitor alleging another
 
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<PAGE>   157
 
issue of patentability and requiring the merger with the second reexamination.
Both proceedings are currently pending in the PTO. No assurance can be given
that the PTO will issue a reexamination certificate confirming the patentability
of the patent claims, or that the patent claims will not be amended in ways that
will reduce any competitive advantages the Tracker patent has provided for
Target's products.
 
     During the last half of calendar 1994, Target learned that two of its
United States competitors had commenced sales in the United States of
micro-catheters that Target believes infringe the Tracker patent. On November 9,
1994, Target filed a lawsuit against SciMed and Cordis Endovascular Systems,
Inc. in the United States District Court in San Jose, seeking damages and
preliminary and permanent injunctive relief against further infringing sales.
The defendants responded, challenging the validity of the Tracker patent,
denying infringement, and raising other defenses. The Court has stayed the
lawsuit until the pending reexamination proceedings have been completed in the
PTO. There can be no assurance that Target will be successful in this action or
that even if Target receives a favorable ruling in the pending reexamination,
the defendants will not prevail in this lawsuit.
 
     Target is also aware that at least one competitor in Europe has sold
micro-catheters that may infringe a patent that could issue on Target's patent
application which is pending in the European Patent Office. Target is
investigating its options for enforcement of its rights with respect to such
infringement. The patent which relates to the variable stiffness design of
Target's Tracker micro-catheter is being opposed in Japan by an undisclosed
party.
 
GOVERNMENT REGULATION AND PRODUCT TESTING
 
     Target's research and development activities are subject to regulation by
numerous governmental authorities in the United States and other countries, and
the production and marketing of any products developed by Target are also
significantly regulated, particularly as to safety and efficacy. In the United
States, medical device products are subject to rigorous FDA review. The Federal
Food, Drug, and Cosmetic Act (the "FDC Act"), the Public Health Service Act and
other federal statutes and regulations govern or influence the testing,
manufacture, safety, labeling, storage, record keeping, market clearance,
advertising and promotion of such products. Non-compliance with applicable
requirements can result in fines, civil penalties, injunctions, suspensions or
losses of regulatory clearance, recall or seizure of products, operating
restrictions, refusal of the government to approve product license applications
or allow Target to enter into supply contracts, and criminal prosecution.
 
     Certain of Target's products are sold pursuant to IDEs obtained from the
FDA. According to IDE regulations, sale of the applicable device for clinical
use may not constitute commercialization. As a result, Target sells products
subject to an IDE at prices which allow only for the recovery of research and
development, manufacturing and handling costs. In addition, products sold under
an IDE are limited by the FDA as to the number of investigation sites and the
number of patients treatable in clinical trials.
 
     In the United States, Target currently sells the GDC system pursuant to an
IDE. Target submitted a 510(k) application in March 1995 regarding the GDC
system that includes clinical data on approximately 800 patients. See
"-- Products -- Micro-Coils."
 
     In order to obtain FDA clearance of a new medical device, Target must
submit proof of safety and efficacy. In most cases, such proof entails extensive
pre-clinical, clinical and laboratory tests. The testing, preparation of
necessary applications and processing of those applications by the FDA is
expensive and time consuming and may take several years to complete. There is no
assurance that the FDA will act favorably or quickly in making such reviews, and
significant difficulties or costs may be encountered by Target in its efforts to
obtain FDA clearance that could delay or preclude Target from marketing any
product it may develop. The FDA may also require post-marketing testing and
surveillance to monitor the effects of proposed products or place conditions on
any clearance that could restrict commercial applications of such products.
Product clearances may be withdrawn if compliance with regulatory standards is
not maintained or if problems occur following initial marketing. In addition,
delays imposed by the governmental review process may materially reduce the
period during which Target may have the exclusive right to commercialize
patented products or technologies.
 
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     The two principal methods by which medical devices may be submitted to the
FDA for clearance to market include a premarket notification filing under
Section 510(k) and a PMA application. To obtain a PMA, the applicant is required
to submit clinical data to the FDA, and the FDA may also request that a 510(k)
include clinical data. Before beginning a clinical study, the applicant must
submit an IDE application to the FDA for approval. The IDE application requires
that in vitro and in vivo animal tests be completed in order to demonstrate
sufficient safety of the product. Clinical studies must be done under a clinical
protocol with assurance of adherence to the protocol, informed consent from
clinical subjects, approval of an Institutional Review Board, maintenance of
required documentation, proper monitoring and appropriate statistical
evaluations.
 
     Applications under the 510(k) procedure must demonstrate substantial
equivalence to a device that was on the market prior to the Medical Device
Amendments of 1976 or to devices marketed thereafter under the 510(k) procedure.
Applicants must defer marketing until a favorable response to the 510(k) is
received from the FDA. While reviewing the 510(k), the FDA may require
additional data, which can have the effect of materially extending the time
required to commence marketing. Each 510(k) for a separate application may
require the submission of clinical data concerning human patients relating to
the safety and the effectiveness for each specific proposed medical use. The FDA
may also refer the device to an advisory panel of experts for consideration and
recommendation, which may delay the 510(k) clearance process.
 
     The preparation and processing of a PMA application is significantly more
complex and time consuming than a 510(k). Once the clinical investigation is
completed, Target must assemble and submit to the FDA a significant quantity of
clinical, animal testing, manufacturing, and other data. The PMA clearance
process may take several years or longer and no assurance can be given
concerning the ultimate outcome of PMAs submitted by an applicant. In addition,
there can be no assurance that required clearance from the FDA for any proposed
potential medical use will be granted, or that the FDA process will not be
unduly expensive or lengthy.
 
     To date, all of Target's FDA marketing clearances for commercially
available products have been obtained through the 510(k) process. It is possible
that future potential applications of existing products or that future products
may require PMA clearance, with corresponding increases in the costs and tune
required to obtain governmental clearance.
 
     Target is also required to register as a medical device manufacturer with
the FDA and state agencies. Target is subject to inspection on a routine basis
by both the FDA and the State of California for compliance with the FDA's
current Good Manufacturing Practice ("GMP") regulations. Under GMP regulations,
Target is subject to certain procedural and documentation requirements with
respect to manufacturing and control activities, and Target's manufacturing
facilities are subject to periodic inspections by the FDA, as well as by state
and foreign regulatory authorities. Target's existing facilities have been
inspected by the FDA in the past. Target believes its manufacturing facilities
are in compliance in all material respects with all applicable local, state and
federal regulations.
 
     Target must also comply with various FDA requirements for design, safety,
advertising, labeling, record keeping and reporting of adverse experiences with
the use of its products. The FDA actively enforces regulations prohibiting
marketing of products for unapproved uses. Failure to comply with applicable
regulatory requirements can result in, among other things, fines, civil
penalties, injunctions, suspensions or loss of clearances, seizures or recalls
of products, operating restrictions, refusal of the government to approve
product license applications or allow Target to enter into supply contracts,
injunctions and criminal prosecutions. Changes in existing requirements or
adoption of new requirements could adversely affect the ability of Target to
comply with regulatory requirements. Failure to comply with regulatory
requirements could have a material adverse affect on Target's business,
financial condition and results of operations.
 
     In addition to regulations enforced by the FDA, Target is also subject to
regulation under the Occupational Safety and Health Act, the Environmental
Protection Act and other present and potential future federal, state or local
regulations. To date, compliance with these regulations has not had any material
effect on its financial results, capital requirements or competitive position.
 
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<PAGE>   159
 
     Sales of medical devices outside the United States are subject to foreign
regulatory requirements that vary widely from country to country. The time
required to obtain clearance required by foreign countries may be longer or
shorter than that required for FDA clearance, and requirements for licensing may
differ significantly from FDA requirements. Some countries have historically
permitted human studies earlier in the product development cycle than
regulations in the United States. Other countries, such as Japan, have standards
similar to those of the FDA. This disparity in the regulation of medical devices
may result in more rapid product clearance in certain countries than in the
United States, while clearance in countries such as Japan may require longer
periods than in the United States. In addition, the European Union has developed
a new approach to the regulation of medical products which may significantly
change the situation in those countries. The receipt or denial of FDA clearance
for a particular product may affect the receipt or denial of regulatory
clearance for that product in certain other countries.
 
     Export sales of investigational devices or devices not cleared for
commercial distribution in the United States are subject to FDA export permit
requirements. In order to obtain such a permit, Target must provide the FDA with
documentation from the medical device regulatory authority of the country in
which the purchaser is located, stating that the sale of the device is not a
violation of that country's medical device laws.
 
PRODUCT LIABILITY LITIGATION AND INSURANCE
 
     Medical device companies are subject to an inherent risk of product
liability and other liability claims in the event that the use of their products
results in personal injury claims. Target's products are often used in the
brain, where there is a high risk of serious injury or death, and in other
life-threatening situations. Such risks will exist even with respect to those
products that have received, or in the future may receive, regulatory clearance
for commercial sale. Target is currently a party to several legal actions
involving product liability claims. While the outcome of these actions is
presently not determinable, it is management's opinion that these matters will
not, either individually or in the aggregate, have a material adverse effect on
Target's business financial condition or results of operations. While Target
seeks to maintain product liability insurance with coverage that Target believes
is comparable to that maintained by companies similar in size and serving
similar markets, there can be no assurance that Target's product liability
insurance will be adequate or that such insurance will remain available at
acceptable costs, or at all. A successful claim brought against Target for which
insurance coverage is denied or in excess of its insurance coverage could have a
material adverse effect on Target's business, financial condition and results of
operations. Additionally, it is possible that adverse product liability actions
could negatively affect Target's ability to obtain and maintain regulatory
clearance for its products.
 
THIRD-PARTY REIMBURSEMENT
 
     Target's products are purchased by hospitals, which, in the United States,
then bill various third-party payers, including Medicare, Medicaid and private
insurers, for the healthcare services provided to patients. Government agencies
reimburse hospitals for medical procedures at a fixed rate according to
diagnosis-related groups. Federal and state laws and regulations govern
reimbursement by such government agencies. Such laws and regulations also
influence reimbursement by private insurance companies of medical fees. Changes
in current policies could reduce or eliminate such reimbursements and thereby
adversely affect future sales of Target's products. Third-party payers may deny
reimbursement if they determine that the device used in the procedure is
unnecessary, inappropriate, not cost-effective, experimental or for a
non-approved indication. Third-party payers may deny reimbursement for
treatments using Target's products, regardless of the FDA clearance status of
such products. Third-party payers are increasingly challenging the prices
charged for medical products and services. There can be no assurance that
reimbursement from third-party payers will be available, or if available, that
reimbursement will not be limited, thereby adversely affecting Target's ability
to sell its products profitably. Although Target has not experienced any
problems to date, significant uncertainty exists as to the reimbursement status
of newly approved health care products and the current political issues being
addressed by the Clinton Administration, and there can be no assurance that
adequate third-party coverage will be available to patients. Similar
circumstances exist in many international markets and are subject to various
foreign health care policies. In such circumstances, sales of Target's products
could be adversely affected.
 
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EMPLOYEES
 
     As of December 31, 1994, Target had 317 full-time and part-time employees,
including 49 in research and development, 19 in regulatory, clinical and quality
assurance, 181 in manufacturing and quality assurance, 41 in sales, marketing
and customer service and 27 in finance and administration. Target is dependent
upon a limited number of key management and technical personnel. Target's future
success will depend in part upon its ability to attract and retain highly
qualified personnel. Target competes for such personnel with other companies,
academic institutions, government entities and other organizations. Target
attempts to maintain competitive compensation, benefits, equity participation
and work environment policies to assist in attracting and retaining qualified
personnel as Target believes that the success of its business will depend, in
part, on its ability to attract and retain such employees. None of Target's
employees is covered by a collective bargaining agreement. Target believes its
relationship with its employees is good.
 
PROPERTIES
 
     In October 1991, Target signed a ten-year lease for a 76,000 square foot
building in Fremont, California and in early fiscal 1993, consolidated its
operations in this facility. In October 1994, Target subleased from Cardima, for
a period of two years with the option to extend, certain space in Cardima's
Fremont location primarily to be utilized for Target's finished goods storage
and shipping needs. Target believes that these facilities will be adequate to
meet its requirements through at least calendar 1995. Target currently
anticipates that it will require additional office space in calendar 1996 and is
currently reviewing alternatives to handle its anticipated future space
requirements.
 
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                              PLAN OF DISTRIBUTION
 
     This Prospectus relates to the offering by Collagen of shares of Common
Stock of Target to be delivered upon exchange of the Notes, in accordance with
the Exchange Agreement (the "Exchange Agreement") dated April   , 1995, between
Collagen and The First National Bank of Boston, as Exchange Agent. No
underwriter, broker or dealer will be employed in connection with the exchange
of shares of Target Common Stock for Notes. Collagen will bear all expenses
associated with the distribution of Target Common Stock in connection with the
exchange for Notes. Certain terms and conditions of the exchange rights are
described under the caption, "Description of Exchange Rights." Certain
relationships between Collagen and Target are described under the caption,
"Beneficial Ownership of Target Common Stock by Collagen and Certain Other
Relationships."
 
                         DESCRIPTION OF EXCHANGE RIGHTS
 
     Pursuant to the Indenture relating to the Notes and the Exchange Agreement,
Collagen has delivered to the Exchange Agent      shares of Target Common Stock
currently owned by Collagen initially required to satisfy the obligations of
Collagen upon exchange of the Notes.
 
     The Underwriting Agreement relating to the offering of the Notes provides
that Target will use its best efforts to keep a registration statement covering
the Target Common Stock for delivery upon exercise of the exchange rights
continuously effective at all times while any of the Notes remain outstanding;
provided, that Target may upon notice to the Exchange Agent decline to
supplement or amend the registration statement covering the exchange of Notes
for Target Common Stock in certain instances for not more than 90 days in any
365 day period and other than during the pendency of any notice of redemption of
Notes or after April 25, 2002. No exchange of Notes for Target Common Stock may
be made while such an election by Target is in effect, and at any time when a
Noteholder seeks to exchange Notes for Target Common Stock, Collagen will be
required to pay cash equal to the Market Price (as hereinafter defined) of the
Target Common Stock. Payment of cash and, in certain instances, Target Common
Stock and other Exchange Property receivable upon exchange by a Noteholder of
its Notes will be subject to the subordination provisions set forth herein and,
accordingly, may be delayed or prohibited. Exchange Property may include
securities other than Target Common Stock, and neither Target nor Collagen will
have any obligation to effect any registration covering the sale of such other
securities upon exchange of Notes.
 
     The Notes are exchangeable at the option of the holder for Target Common
Stock or other Exchange Property at any time after 60 days following issuance
and prior to maturity, conversion or redemption at a price (the "Exchange
Price") initially equal to $          per share of Target Common Stock
equivalent to an exchange rate of           shares of Target Common Stock per
$1,000 principal amount of Notes. The Exchange Price will be proportionately
adjusted upon (a) the payment in shares of Target Common Stock of a dividend or
distribution on Target Common Stock; (b) the combination of outstanding shares
of Target Common Stock into a smaller number of shares of Target Common Stock;
(c) the subdivision of outstanding shares of Target Common Stock into a greater
number of shares of Target Common Stock; or (d) the reclassification of Target
Common Stock resulting in the issuance of any shares of capital stock of Target.
 
     In order to exercise exchange rights, a Noteholder must properly complete
the Exchange Notice provided on the Note and surrender the Note to the Exchange
Agent at the office of the Exchange Agent maintained for such purpose in New
York, New York. The right to exchange Notes will terminate on the fifth day
preceding the redemption date and will be lost if not exercised prior to that
time. No fractional shares or interests in Target Common Stock or other Exchange
Property will be delivered on any exchange of Notes, but in lieu thereof, a cash
adjustment will be paid based on the Market Price (as defined below) of the
Target Common Stock or other Exchange Property.
 
     No payment or adjustment will be made for accrued interest on an exchanged
Note. If any Noteholder surrenders a Note for exchange between the record date
for the payment of an installation of interest and the next interest payment
date, then, notwithstanding such exchange, the interest payable on such interest
payment date will be paid to the holder on such record date. However, in such
event, such Note, when surrendered for exchange, must be accompanied by delivery
by the exchanging Noteholder of a check or draft
 
                                       33
<PAGE>   162
 
payable in an amount equal to the interest payable on such interest payment date
on the portion so exchanged.
 
     Collagen's Cash Option on Exchange.  In lieu of delivering Exchange
Property in exchange for any Note, Collagen may pay to the holder surrendering
such Notes, within five business days of receipt by the Exchange Agent of a
Noteholder's notice of exchange, an amount in cash equal to the market price of
the Exchange Property for which such Notes are exchangeable (the "Market
Price"), based on (a) in the case of Target Common Stock or other Exchange
Property which consists of publicly traded securities, the average closing
market price (or average bid and asked prices, if closing prices are not
available) for the five consecutive trading days immediately preceding the date
of receipt by the Exchange Agent of the notice of exchange relating to such
Notes (or, if such date is not a business day, on the business day next
preceding such date), and (b) in the case of Exchange Property which does not
consist of publicly traded securities, the market value of such property on the
date of receipt by the Exchange Agent of the notice of exchange relating to such
Notes, as determined by an investment banking firm selected by the Exchange
Agent. The Indenture provides that Collagen is required to deliver cash equal to
the Market Price for Notes exchanged in the event that a registration statement
covering the Target Common Stock deliverable upon exchange is not then effective
under the Securities Act or Target has elected to suspend exchange of Notes for
Target Common Stock.
 
     Additions to and Withdrawals from the Exchange Property.  Collagen will be
entitled to receive and retain all ordinary cash dividends paid out of retained
earnings on the shares of Target Common Stock deposited with the Exchange Agent.
All other distributions, if any, on Target Common Stock or other Exchange
Property deposited with the Exchange Agent shall become additional Exchange
Property. The additional Exchange Property will be apportioned pro rata among
the deposited shares of Target Common Stock, or, if there are no such shares,
among such other Exchange Property as shall have replaced such shares.
 
     If there is a taxable distribution on Exchange Property of any securities,
options, warrants or similar rights or other noncash items of property, Collagen
will instruct the Exchange Agent to sell all such distributed property for cash,
and the cash proceeds of such property after payment of taxes thereon, including
income taxes of Collagen, will be Exchange Property. If extraordinary cash
dividends are paid on securities constituting Exchange Property pursuant to a
plan of liquidation, partial liquidation, recapitalization or restructuring, or
if securities constituting Exchange Property are converted into cash pursuant to
a merger or tender offer, then such cash after payment of any taxes thereon,
including income taxes of Collagen, will be Exchange Property.
 
     If there is a nontaxable distribution on Exchange Property of any
securities or other noncash items of property (other than options, warrants or
similar rights as described in the following paragraph), Collagen in good faith
may, at its option, cause the sale of some or all of such property, and the cash
proceeds and/or the remainder of such property after payment of any taxes
thereon, including income taxes of Collagen, will be Exchange Property;
provided, that if Collagen has received a similar nontaxable distribution on
similar securities owned by Collagen not comprising Exchange Property, including
Target Common Stock, Collagen may not sell the distribution property or the
Exchange Property unless Collagen also sells the distribution property on the
similar securities owned by Collagen.
 
     If there is a nontaxable distribution on Exchange Property of any options,
warrants or similar rights, Collagen in good faith may, at its option, (a) cause
the sale of such options, warrants or similar rights and the cash proceeds after
payment of any taxes thereon, including income taxes of Collagen, will be
Exchange Property; (b) to the extent there is sufficient cash among the Exchange
Property or to the extent Collagen may cause the sale of Target Common Stock or
other Exchange Property to provide sufficient cash, after payment of taxes
thereon, among the Exchange Property, cause the exercise of such options,
warrants or similar rights and thereafter, either (i) retain the securities
received upon such exercise as Exchange Property, (ii) cause some or all of such
securities to be sold, in which case the cash proceeds and the remainder of such
property, if any, after payment of any taxes thereon, including income taxes of
Collagen, will be Exchange Property, or (iii) cause the pro rata distribution of
such securities to Noteholders; (c) retain such options, warrants or similar
rights as Exchange Property, provided that such options, warrants or similar
rights shall not be allowed to expire unexercised so long as they are in the
money and if otherwise feasible; or (d) cause the
 
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<PAGE>   163
 
pro rata distribution of such options, warrants or similar rights to
Noteholders; provided, that if Collagen has received a similar nontaxable
distribution on similar securities owned by Collagen not comprising Exchange
Property, including Target Common Stock, Collagen may not sell the distribution
property or the Exchange Property unless Collagen also sells the distribution
property on the similar securities owned by Collagen. Because any subsequent
distribution to Noteholders of securities, options, warrants or similar rights
or other noncash items of property received with respect to Exchange Property
may give rise to tax liability for Collagen, Collagen may be more likely to
elect to cause the sale of such items (or, in the case of options, warrants or
similar rights, to cause the sale of the securities received upon the exercise
of such items) and to cause the cash proceeds (after provision for taxes) to be
treated as Exchange Property, in lieu of causing the pro rata distribution of
such items to the Noteholders.
 
     Upon the happening of any of the foregoing events with respect to the
Target Common Stock or other Exchange Property that is taxable or treated as
being taxable to Collagen or the Exchange Agent, the Exchange Agent will deliver
cash which it holds for exchange (including cash received as a result of such
event) to Collagen or to itself for payment of the taxes arising from such
transaction. If the cash held for exchange is insufficient to pay such taxes,
the Exchange Agent will sell such of the shares of Target Common Stock or other
Exchange Property as may be necessary to pay the amount of the insufficiency and
any taxes payable by Collagen or the Exchange Agent arising from such sale. Any
proceeds from such sale which remain after the above tax payments are made will
be Exchange Property. As a result of the payment of such taxes from the Exchange
Property, the net amount of Exchange Property received by a holder upon
exchanging Notes for such Exchange Property may be significantly less than the
amount of Exchange Property that would have been received by such holder (after
taking into account taxes imposed on the holder with respect to such exchange,
as described in "Certain United States Federal Income Tax Consequences --
Exchange of Notes for Target Common Stock") had the holder exercised the
exchange right immediately prior to any such event.
 
     In the event of a proposed merger, consolidation or reorganization of
Target, the sale of all or substantially all of Target's assets, or certain
tender or exchange offers for Target Common Stock (a "Reorganization"), the
Noteholders shall have the option to conditionally exercise their right to
exchange all or any portion of their Notes for Exchange Property in advance of
the Reorganization subject to its completion and to withdraw such exchange and
retain their Notes within certain time periods set forth in the Exchange
Agreement in the event that such Reorganization is not effected.
 
     Merger or Consolidation of Target.  In the case of any merger or
consolidation of Target with or into any other entity which results in shares of
Target Common Stock being converted into other securities and/or property,
including cash, or any sale or transfer of all or substantially all the assets
of Target in which holders of Target Common Stock receive other securities
and/or property, including cash, in exchange for their shares of Target Common
Stock, Collagen will execute and deliver to the Trustee a supplemental
indenture, and to the Exchange Agent a supplement to the Exchange Agreement,
each providing that the holder of any Note surrendered for exchange thereafter
will, subject to provision for taxes, be entitled to receive, in addition to
other Exchange Property, if any, the kind and amount of securities and/or
property receivable in connection with such transaction by a holder of the
number of shares of Target Common Stock for which such Note might have been
exchanged immediately prior to such transaction, plus accrued interest thereon,
if any, to the date of exchange.
 
     Tender or Exchange Offer.  In the event of a tender offer or exchange offer
for any class of securities included within the Exchange Property (a) if
Collagen owns other securities of such class which are not Exchange Property,
Collagen will cause the Exchange Agent to tender such securities of such class
in the same proportion that Collagen tenders its securities in such class which
are not Exchange Property, and (b) if the only securities of such class owned by
Collagen are Exchange Property, Collagen may, at its option and in its sole
discretion, elect to cause the Exchange Agent to tender all or any portion or
none of such class of security included within the Exchange Property. If,
however, the tender or exchange offer for securities included within the
Exchange Property is made by Collagen or any affiliate of Collagen, Collagen
will not cause the Exchange Agent to tender any such securities unless a
majority of such class of securities that are held by persons other than
Collagen or any affiliate of Collagen have been tendered and not withdrawn
 
                                       35
<PAGE>   164
 
pursuant to such tender or exchange offer as of immediately prior to the
expiration of such offer. The proceeds, after provision for taxes, of the sale
of any such Exchange Property pursuant to any such tender or exchange offer,
plus accrued interest thereon, if any, to the date of exchange, will be held by
the Exchange Agent for the benefit of Noteholders as provided in the Indenture.
A tender or exchange offer, whether made by Collagen, any affiliate of Collagen
or a third party, may result in shares of Target Common Stock or other Exchange
Property being replaced by cash or other property (which may or may not be
publicly traded equity securities).
 
     If any tender offer or exchange offer results in there being no shares of
Target Common Stock among the Exchange Property, Collagen will execute and
deliver to the Trustee a supplemental indenture, and to the Exchange Agent a
supplement to the Exchange Agreement, each providing that any Note surrendered
for exchange thereafter will, subject to provision for taxes, be entitled to
receive, in addition to other Exchange Property, if any, the kind and amount of
securities and/or property receivable upon or in connection with such tender or
exchange offer by a holder of the number of shares of Target Common Stock for
which such Note might have been exchanged immediately prior to such transaction.
 
     Certain Tax Withholding; Notices; and Investment of Exchange
Property.  From time to time, Collagen may require the Exchange Agent to
segregate such Exchange Property as Collagen determines may be necessary for
Collagen or the Exchange Agent to pay taxes with respect to the transactions or
events described above. The remaining Exchange Property will be deliverable to
holders of Notes only after determination that withholding is not necessary for
the payment of such taxes and after deducting the reasonable expenses incurred
in connection with such determination.
 
     Collagen is required to notify Noteholders of certain dividends or other
distributions on the Target Common Stock or other Exchange Property deliverable
upon exchange of Notes, the granting of subscription rights, options, warrants
or other similar rights to holders of Target Common Stock, any reclassification
of Target Common Stock, certain mergers involving Target, the sale of all or
substantially all of the assets of Target, any tender or exchange offer for the
Target Common Stock and the dissolution, liquidation or winding up of Target.
 
     Any cash held by the Exchange Agent that is deliverable as Exchange
Property upon exchange of Notes will be invested by the Exchange Agent at the
direction of Collagen in U.S. Government Obligations with maturity dates of
twelve months or less. Accrued interest, if any, on such investments shall
become the property of Collagen except for interest accruing on Exchange
Property received upon conversion or sale of Target Common Stock in connection
with a merger, consolidation, or reorganization of Target or a tender or
exchange offer for Target Common Stock.
 
                                       36
<PAGE>   165
 
             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
     The following summary is a general discussion of certain United States
federal income tax consequences of the exchange of the Notes for Target Common
Stock, and of acquiring, holding and disposing of Target Common Stock received
in such exchange. The summary is based upon laws, regulations, rulings and
decisions now in effect, all of which could change prior to the date on which a
holder acquires Target Common Stock (or other Exchange Property) upon exchange
of Notes. This summary does not discuss all aspects of federal income taxation
that may be relevant to a particular investor who exchanges Notes for Target
Common Stock (or other Exchange Property) in light of the investor's personal
investment circumstances and does not discuss any aspects of state, local,
foreign or federal estate and gift tax laws that may be applicable to the Notes,
to Target Common Stock or to the holders thereof. This discussion is limited to
persons who hold Notes and Target Common Stock as "capital assets" (generally,
property held for investment) within the meaning of section 1221 of the Internal
Revenue Code of 1986, as amended (the "Code"), and does not cover special rules
applicable to taxpayers who may fall into special classes, such as financial
institutions, insurance companies, mutual funds, dealers in securities, persons
holding the Notes as a position in a straddle or other integrated investment, S
corporations, trusts, individual retirement accounts and tax-exempt
organizations. This discussion also does not deal with circumstances where all
or a portion of the Exchange Property is other than Target Common Stock.
Accordingly, prospective investors should consult their own tax advisors with
respect to the application of federal, state, local and foreign tax laws to them
in light of their particular circumstances concerning the matters discussed
below.
 
     Investors should particularly note that the federal income tax treatment of
exchangeable debt instruments like the Notes is uncertain in a number of
significant respects. In addition, the treatment of such instruments under the
Code and proposed and final Treasury Regulations has been the subject of
frequent changes in the past and could be subject to further changes in the
future. Therefore, prospective investors are also urged to consult their tax
advisors with respect to possible future clarifications and changes in the
applicable rules governing such instruments.
 
ORIGINAL ISSUE DISCOUNT
 
     Under final Treasury Regulations relating to original issue discount (the
"OID Regulations") and the terms of the Indenture, each Note will generally be
treated for federal income tax purposes as an investment unit consisting of two
distinct assets: (i) a debt instrument (the "Debt Component") with a fixed
principal amount payable at maturity of the Note and bearing interest at the
stated interest rate, and (ii) an option component (the "Option Component")
entitling the holder to exchange the Note for the Exchange Property on the terms
described herein. The OID Regulations generally require that each holder
allocate the purchase price of the Note between the Debt Component and the
Option Component based on their relative fair market values. Collagen has
determined that $          of each $1,000 face amount of Notes will be allocated
to the Option Component and the remainder to the Debt Component. For federal
income tax purposes, the difference between the portion of the purchase price
allocated to the Debt Component and the principal amount of the Note payable at
maturity constitutes OID, which holders will be required to include as ordinary
income as it accrues over the term of the Note, in accordance with a constant
yield to maturity method (in addition to the stated interest on the Note), prior
to receipt of payments attributable to such income through exchange, redemption,
other disposition or maturity of the Note. Collagen's allocation of the purchase
price between the Debt Component and Option Component is based on its
determination of the relative fair market values of those two components.
However, there can be no assurance that the Internal Revenue Service ("IRS")
will not challenge that allocation, in which case Noteholders could recognize
more or less OID than determined by Collagen.
 
     Tax Basis of Notes.  A holder's federal income tax basis with respect to
the Debt Component and the Option Component of a Note will initially equal the
portion of the purchase price of the Note allocated to each such component as
described in the preceding section. The holder's tax basis with respect to the
Debt Component will thereafter increase by the amount of OID required to be
included in the holder's income.
 
                                       37
<PAGE>   166
 
EXCHANGE OF NOTES FOR TARGET COMMON STOCK
 
     If a holder exercises the right to exchange a Note for Target Common Stock,
such exchange will be treated as a taxable disposition in which the holder will
be required to recognize taxable gain (or loss). In determining the amount of
such gain or loss, it is likely (based on the bifurcation approach under the OID
Regulations) that a holder will be treated as disposing of the Debt Component of
the Note in a taxable transaction for an amount equal to its then fair market
value and as exercising the Option Component of the Note for an exercise price
equal to the Debt Component's then fair market value. In such event, a holder
would recognize gain (or loss) on the disposition of the Debt Component equal to
the amount by which the fair market value of such Debt Component exceeded (or
was less than) the tax basis of the Debt Component determined as described
above. The receipt of Target Common Stock upon exercise of the Option Component
would, in such event, be non-taxable to the extent Target Common Stock was
received but would result in recognition of gain with respect to the Option
Component to the extent the holder received cash rather than Target Common
Stock. However, it is possible that a holder could instead recognize gain (or
loss) on the exercise of the exchange right equal to the difference between the
fair market value of the Target Common Stock and the holder's overall tax basis
in the Note. Any gain or loss on the exchange generally will be long-term
capital gain or loss if the Note has been held for more than one year.
 
     If the first of the two characterizations set forth in the preceding
paragraph applies, then the holder's tax basis for the Target Common Stock
received in the exchange would equal the sum of the tax basis of the Option
Component and the fair market value of the Debt Component surrendered in the
exchange. If instead the second characterization applies, then the tax basis of
the Target Common Stock would equal its fair market value at the time of the
exchange. The holder's holding period for the Target Common Stock would not
include any portion of the holding period for the Note.
 
DISTRIBUTIONS ON TARGET COMMON STOCK
 
     Distributions with respect to shares of Target Common Stock that are
received in exchange for Notes will be treated as dividends for federal income
tax purposes and will be taxed as ordinary income to the extent of Target's
earnings and profits for such purposes. Certain corporations may qualify for a
70% dividends received deduction (80% for certain corporate stockholders owning
at least 20%, by vote and value, of Target's stock) if various conditions are
met.
 
     Distributions will constitute dividends taxable as ordinary income to the
extent Target has either (a) current earnings and profits determined at the end
of the taxable year in which the distribution is made or (b) accumulated
earnings or profits determined at the time the distribution is made. To the
extent that the entire distribution is greater than the amount of earnings and
profits determined above, the excess will be treated as a nontaxable return of
capital which will reduce the recipient's basis for the Target Common Stock. To
the extent that a recipient receives aggregate distributions that are not out of
current or accumulated earnings and profits and such distributions exceed the
tax basis of the Target Common Stock, the excess will be taxed as a gain from
the sale or exchange of the Target Common Stock. See "-- Dispositions of Target
Common Stock."
 
DISPOSITIONS OF TARGET COMMON STOCK
 
     Generally, any sale or other disposition of Target Common Stock will be a
taxable event and will result in capital gain or loss if the Target Common Stock
is held as a capital asset. The amount of such gain or loss will generally be
the difference between the federal income tax basis of the Target Common Stock
on the date of the sale or other disposition and the cash and fair market value
of property received. Such gain or loss will be long-term capital gain or loss
if the Target Common Stock is held for more than one year.
 
BACKUP WITHHOLDING
 
     Under the backup withholding provisions of the Code and applicable Treasury
Department regulations, a holder of Target Common Stock may be subject to backup
withholding at the rate of 31% with respect to dividends on Target Common Stock
and the gross proceeds of a sale, exchange, retirement or redemption of
 
                                       38
<PAGE>   167
 
Target Common Stock. However, backup withholding generally will not be required
if such holder (a) is a corporation or comes within certain other exempt
categories and when required demonstrates this fact or (b) provides a taxpayer
identification number, certifies as to no loss of exemption from backup
withholding, and otherwise complies with applicable requirements of the backup
withholding rules. The amount of any backup withholding from a payment to a
holder will be allowed as a credit against the holder's federal income tax
liability and may entitle such holder to a refund, provided that the required
information is furnished to the IRS.
 
     Collagen or Target will cause to be reported to the holders of Target
Common Stock and the IRS for each calendar year the amount of dividends paid
during such year, and the amount of tax withheld, if any, with respect to the
same.
 
FOREIGN HOLDERS
 
     A Non-United States Holder is a holder who is not, for United States
federal income tax purposes, (i) a citizen or resident of the United States,
(ii) a corporation, partnership or other entity created or organized in or under
the laws of the United States or any political subdivision thereof, or (iii) an
estate or trust the income of which is subject to United States federal income
taxation regardless of source.
 
     In general, dividends paid on shares of Target Common Stock held by a
Non-United States Holder will be subject to withholding tax at a rate of 30% but
will not be subject to backup withholding. The withholding rate may be lower
under an applicable tax treaty. A Non-United States Holder generally will not be
subject to United States federal income tax on any gain realized in connection
with a disposition or retirement of Notes (including the exchange of a Note for
Target Common Stock) or Target Common Stock unless (i) the gain is effectively
connected with a trade or business carried on by the Non-United States Holder
within the United States, or, if a treaty applies, generally attributable to a
United States permanent establishment maintained by the Non-United States
Holder, or (ii) the Non-United States Holder is an individual who is present in
the United States for 183 days or more in the taxable year of disposition and
has a tax home or an office or other fixed place of business to which the gain
is attributable in the United States.
 
     Prospective Non-United States Holders should consult their tax advisors as
to the scope of and procedural requirements under any treaties and with regard
to the special backup withholding rules and provisions regarding gain from the
sale, exchange, redemption or other disposition of Notes or Target Common Stock
applicable to such purchasers.
 
                                       39
<PAGE>   168
 
                      DESCRIPTION OF TARGET CAPITAL STOCK
 
     The authorized capital stock of Target consists of 25,000,000 shares of
Common Stock, $0.0025 par value per share, and 2,000,000 shares of Preferred
Stock, $0.001 par value per share.
 
COMMON STOCK
 
     The holders of Common Stock are entitled to one vote per share on all
matters to be voted upon by the stockholders, except that, upon giving the
legally required notice, stockholders may cumulate their votes in the election
of directors. Subject to preferences that may be applicable to any outstanding
Preferred Stock, the holders of Target Common Stock are entitled to receive
ratably such dividends, if any, as may be declared from time to time by the
Board of Directors out of funds legally available therefor. See "Price Range of
Target Common Stock and Dividend Policy." In the event of a liquidation,
dissolution or winding up of Target, the holders of Target Common Stock are
entitled to share ratably in all assets remaining after payment of liabilities,
subject to prior rights of Preferred Stock, if any, then outstanding. The Target
Common Stock has no preemptive or conversion rights or other subscription
rights. There are no redemption or sinking fund provisions available to the
Target Common Stock. All outstanding shares of Target Common Stock are fully
paid and non-assessable.
 
     At December 31, 1994, 7,067,562 shares of Target Common Stock were
outstanding and held by approximately 150 holders of record, and stock options
for an aggregate of 628,629 shares of Target Common Stock were also outstanding.
 
PREFERRED STOCK
 
     Target is authorized to issue 2,000,000 shares of Preferred Stock, of which
50,000 shares have been designated as Series A Participating Preferred Stock
(see "-- Preferred Share Purchase Rights"), and none of which is issued and
outstanding. The Board of Directors has the authority to issue the undesignated
Preferred Stock in one or more series and to fix the rights, preferences,
privileges and restrictions granted to or imposed upon any wholly unissued
shares of undesignated Preferred Stock and to fix the number of shares
constituting any series and the designation of such series, without any further
vote or action by the stockholders. The issuance of Preferred Stock may have the
effect of delaying, deferring or preventing a change in control of Target
without further action by the stockholders and may adversely affect the voting
and other rights of the holders of Target Common Stock. At present, Target has
no plans to issue any shares of Preferred Stock.
 
PREFERRED SHARE PURCHASE RIGHTS
 
     Each share of Target Common Stock has associated with it one Preferred
Share Purchase Right (a "Right"). The Rights trade automatically with shares of
Target Common Stock and may not be exercised or traded separately until certain
events occur, including if a person or group acquires beneficial ownership of
15% or more of Target's Common Stock (or, in the case of Collagen, acquires
shares of Target Common Stock that would increase its holdings above their
September 21, 1994 level, unless approved by Target's Board of Directors or a
committee thereof); or announces a tender or exchange offer, the consummation of
which would result in ownership by a person or group of 15% or more of Target's
Common Stock. After becoming exercisable, each Right will entitle the holder to
purchase, for $135.00, a fraction of a share of Target's Series A Participating
Preferred Stock with economic terms similar to that of one share of Target's
Common Stock. In addition, after any person (an "Acquiring Person") acquires 15%
or more of Target's Common Stock (other than pursuant to a tender offer deemed
fair by the Board of Directors (a "Permitted Offer")) (or, in the case of
Collagen, acquires shares of Target Common Stock that would increase its
holdings above their September 21, 1994 level, unless approved by Target's Board
of Directors or a committee thereof), then each Right (other than Rights owned
by an Acquiring Person or its affiliates) will entitle the holder thereof to
purchase, for the exercise price, a number of shares of Target's Common Stock
having a then current market value of twice the exercise price. If, after such
date, Target merges into another entity, an acquiring entity merges into Target,
or (c) Target sells more than 50% of its assets or earning power, then each
Right (other than Rights owned by an Acquiring Person or its affiliates) will
entitle the holder thereof to
 
                                       40
<PAGE>   169
 
purchase, for the exercise price, a number of shares of Target Common Stock of
the person engaging in the transaction having a then current market value of
twice the exercise price (unless the transaction satisfies certain conditions
and is consummated with a person who acquired shares pursuant to a Permitted
Offer, in which case the Rights will expire).
 
     The Rights are redeemable at Target's option for $0.01 per Right at any
time on or prior to the tenth day (or such later date as may be determined by a
majority of Target's directors who are not affiliated with an Acquiring Person)
after any person becomes an Acquiring Person. At any time after a person becomes
an Acquiring Person and prior to the acquisition by the Acquiring Person of 50%
or more of the outstanding Target Common Stock, Target's Board of Directors may
exchange the Rights (other than Rights owned by the Acquiring Person or its
affiliates), in whole or in part, at an exchange ratio of one share of Target
Common Stock per Right (subject to adjustment). The Rights will expire, if not
earlier exchanged or redeemed, on September 21, 2004.
 
DELAWARE LAW
 
     Target is subject to the provisions of Section 203 of the Delaware General
Corporation Law. In general, the statute prohibits a publicly held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years after the date that the person became
an interested stockholder unless (with certain exceptions) the business
combination or the transaction in which the person became an interested
stockholder is approved in a prescribed manner. Generally, a "business
combination" includes a merger, asset or stock sale, or other transaction
resulting in a financial benefit to the stockholder, and an "interested
stockholder" is a person who, together with affiliates and associates, owns (or
within three years prior, did own) 15% or more of the corporation's outstanding
voting stock. This provision may have the effect of delaying, deferring or
preventing a change in control of Target without further action by the
stockholders. However, this provision will not restrict transactions between
Target and Collagen, which became an interested stockholder more than three
years ago. See "Beneficial Ownership of Target Common Stock By Collagen and
Certain Other Relationships."
 
TRANSFER AGENT AND REGISTRAR
 
     The Transfer Agent and Registrar for Target's Common Stock is The First
National Bank of Boston, Boston, Massachusetts.
 
                                       41
<PAGE>   170
 
                  BENEFICIAL OWNERSHIP OF TARGET COMMON STOCK
                  BY COLLAGEN AND CERTAIN OTHER RELATIONSHIPS
 
     As of March 15, 1995, Collagen owned 2,124,194 shares of Target Common
Stock, representing approximately 30% of the outstanding shares of Target Common
Stock. Prior to any exchange of Notes for Target Common Stock, Collagen will
continue to own the shares of Common Stock issuable upon exchange of the Notes,
and will continue to exercise all rights, including voting rights, incident to
such ownership. Accordingly, Collagen may have sufficient voting power to
significantly influence the outcome of matters submitted to Target's
stockholders for approval. As a result, Collagen may have the power to influence
any potential proxy contest, merger, tender offer, open-market repurchase
program or other purchases of Target Common Stock that could result in a change
of the composition of the Exchange Property or give the holders of Target Common
Stock the opportunity to realize a premium over the then prevailing market price
for shares of Target Common Stock. In addition, two members of Target's Board of
Directors, Howard D. Palefsky and William G. Davis, are also directors of
Collagen, and Mr. Palefsky also is an officer of Collagen, and Collagen thereby
may be able to exercise additional control over Target's affairs. Collagen has
in the past sold and expects to continue to sell shares of Target Common Stock
in the open market or otherwise, subject to the limitations of Rule 144 and
Collagen's agreement with the Underwriter to refrain from sales of Target Common
Stock for a period of 90 days after the date of the Prospectus relating to the
sale of the Notes. Such sales may have the effect of depressing the trading
price of Target's Common Stock.
 
     Collagen and Target have also entered into a Stockholder Agreement (the
"Stockholder Agreement") providing that all transactions between Target and
Collagen or any affiliate of Collagen must be approved by a special committee of
Target's Board of Directors comprised of three directors who are not officers,
directors, employees or affiliates of Collagen. The members of this committee
currently are Richard D. Randall and Charles M. Strother, M.D., with one
vacancy. During the effective term of the Stockholder Agreement, Collagen may
not vote to eliminate from the Company's Certificate of Incorporation provisions
requiring cumulative voting for the election of directors. In addition, the
Stockholder Agreement provides that Collagen will not sell any of its Target
Common Stock at a premium over the average market price over the three day
period preceding such sale, except for premiums which may be simultaneously
received by all of Target's stockholders in the event of a tender offer, merger
or reorganization. With respect to the offering made hereby, Target and Collagen
have agreed that the shares offered by Collagen upon exchange of Notes may be
sold on the terms and conditions described in this Prospectus. The Stockholder
Agreement requires that affiliates of Collagen purchasing Target Common Stock
from Collagen agree to the foregoing restrictions. The provisions of the
Stockholders Agreement became effective upon the consummation of the Company's
initial public offering in January 1992 and terminate on the earlier of seven
years from the date of the Stockholder Agreement or on the date Collagen
beneficially owns less than 5% of Target's Common Stock.
 
     Collagen and Target have entered into an agreement which provides that
Collagen will pay all fees and expenses directly related to the offering of the
Notes and the Common Stock offered hereby, including those of Target. Collagen
and Target also have agreed that they will indemnify each other for any losses
suffered by the other as a result of any material misstatements or omissions by
the indemnifying party in this Prospectus or the Registration Statement of which
this Prospectus is a part.
 
                                    EXPERTS
 
     The consolidated financial statements of Target Therapeutics, Inc. at March
31, 1994 and 1993, and for each of the three years in the period ended March 31,
1994, incorporated by reference in this Prospectus have been audited by Ernst &
Young LLP, independent auditors, as set forth in their report thereon
incorporated by reference herein and are included in reliance upon such report
given upon the authority of such firm as experts in accounting and auditing.
 
                                       42
<PAGE>   171
 
        ---------------------------------------------------------
           ---------------------------------------------------------
        ---------------------------------------------------------
           ---------------------------------------------------------
 
NO PERSON HAS BEEN AUTHORIZED IN
                                CONNECTION WITH
 
THE OFFERING MADE HEREBY TO GIVE ANY
INFORMATION OR TO MAKE ANY
REPRESENTATION NOT CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT
BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY COLLAGEN, TARGET OR THE
UNDERWRITER. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF ANY OFFER TO BUY ANY
OF THE SECURITIES OFFERED HEREBY TO
                            ANY PERSON OR BY ANYONE
                                                [TARGET THERAPEUTICS LOGO]
IN ANY JURISDICTION IN WHICH IT IS
UNLAWFUL TO MAKE SUCH OFFER OR
SOLICITATION. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION
THAT THE INFORMATION CONTAINED HEREIN
IS CORRECT AS OF ANY DATE SUBSEQUENT
TO THE DATE HEREOF.
 
------------------------------------------------------------
 
          TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                       Common Stock
                                          PAGE
                                         ------
<S>                                      <C>
</TABLE>
 
                                                  Issuable Upon Exchange
<TABLE>
<S>                                      <C>
Available Information....................      2
</TABLE>
 
                                                   of    % Exchangeable
<TABLE>
<S>                                      <C>
Incorporation of Certain Documents of
  Target by
</TABLE>
 
                                               Subordinated Notes Due 2002
<TABLE>
<S>                                      <C>
  Reference..............................      2
</TABLE>
 
                                                 of Collagen Corporation
<TABLE>
<S>                                      <C>
Prospectus Summary.......................      3
Risk Factors.............................      5
Selected Consolidated Financial Data of
  Target.................................     11
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations of Target...................     12
Business of Target.......................     18
Plan of Distribution.....................     33
</TABLE>
 
                    ------------------------------------------------------------
<TABLE>
<S>                                      <C>
Description of Exchange Rights...........     33
Certain United States Federal Income
</TABLE>
 
                                                        PROSPECTUS
<TABLE>
<S>                                      <C>
  Tax Consequences.......................     37
Description of Target Capital Stock......     40
</TABLE>
 
                    ------------------------------------------------------------
<TABLE>
<S>                                      <C>
Beneficial Ownership of Target Common
  Stock By Collagen and Certain Other
  Relationships..........................     42
Experts..................................     42
</TABLE>
 
                                                                , 1995
 
        ---------------------------------------------------------
           ---------------------------------------------------------
        ---------------------------------------------------------
           ---------------------------------------------------------
    
<PAGE>   172
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the expenses payable in connection with the
issuance and distribution of the securities being registered. All of the amounts
shown are estimates, except for the SEC and NASD filing fees. All of the
expenses payable in connection with this offering will be paid by Collagen.
 
<TABLE>
<CAPTION>
                                         AMOUNT
                                         TO BE
                  ITEM                    PAID
-----------------------------------------------
<S>                                      <C>               <S>        <C>
            SEC filing fee..........................................   $ 15,518
            NASD filing fee.........................................      5,000
            Accounting fees and expenses............................    100,000
            Legal fees and expenses.................................    250,000
            Printing and engraving expenses.........................    100,000
            Blue sky fees and expenses..............................     15,000
            Trustee and Exchange Agent fees.........................     10,000
            Miscellaneous...........................................     29,482
                                                                      ----------
              Total.................................................   $525,000
                                                                      ==========
</TABLE>
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145(a) of the Delaware General Corporation Law (the "DGCL")
provides in relevant part that "a corporation may indemnify any person who was
or is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had not reasonable cause to believe his conduct was unlawful."
With respect to derivative actions, Section 145(b) of the DGCL provides in
relevant part that "[a] corporation may indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action or suit by or in the right of the corporation to procure a
judgment in its favor . . . [by reason of his service in one of the capacities
specified in the preceding sentence] against expenses (including attorneys'
fees) actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interest of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper."
 
     Section 102(b)(7) of the Delaware General Corporation Law permits a
corporation to provide in its certificate of incorporation that a director of
the corporation shall not be personally liable to the corporation or its
stockholders for monetary damages for breach of fiduciary duty as a director,
except for liability (i) for any breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or
 
                                      II-1
<PAGE>   173
 
a knowing violation of law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit. Article XI of Collagen's Certificate of
Incorporation, as amended, provides that no director of Collagen shall be liable
for monetary damages for any breach of fiduciary duty, except to the extent that
the Delaware General Corporation Law prohibits the elimination or limitation of
liability of directors for breach of fiduciary duty. Article VIII of Target's
Restated Certificate of Incorporation provides that no director of Target shall
be liable for monetary damages for any breach of fiduciary duty, except to the
extent that the Delaware General Corporation Law prohibits the elimination or
limitation of liability of directors for breach of fiduciary duty. Article VIII
also provides that Target shall indemnify to the fullest extent permitted by law
any person made or threatened to be made a party to an action or proceeding,
whether criminal, civil, administrative or investigative, by reason of the fact
that he, his testator or intestate is or was a director, officer or employee of
Target or any predecessor of the corporation, or serves or served at any other
enterprise as a director, officer or employee at the request of Target or any
predecessor to the corporation.
 
     The Bylaws of Collagen and Target provide that the corporation shall
indemnify to the full extent authorized by law any person made or threatened to
be made a party to an action or a proceeding, whether criminal, civil,
administrative or investigative, by reason of the fact that he was or is a
director, officer, employee, or agent of the corporation or serves or served any
other enterprise as a director, officer, employee, or agent at the request of
the corporation. Collagen and Target have entered into Indemnification
Agreements with its officers and directors. Collagen and Target each maintain an
insurance policy covering their officers and directors under which the insurer
has agreed to pay, subject to certain exclusions, the amount of any claim made
against such officers or directors for wrongful acts that such officers or
directors may otherwise be required to pay or for which Collagen and Target are
required to indemnify such officers or directors. Section 8 of the Underwriting
Agreement provides for indemnification by the Underwriters of directors,
officers and controlling persons of the Registrants against certain liabilities,
including liabilities under the Securities Act of 1933, as amended (the "Act"),
under certain circumstances.
 
ITEM 16.  EXHIBITS
 
     (a)  Exhibits
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                     DESCRIPTION
  ------   --------------------------------------------------------------------------------
  <C>      <S>
    1.1    Form of Underwriting Agreement.
    4.1*   Form of Indenture by and between Collagen and The First National Bank of Boston,
           as Trustee (including Form of Note as Exhibit A).
    4.2*   Form of Exchange Agent Agreement by and between Collagen and The First National
           Bank of Boston, as Exchange Agent.
    5.1*   Opinion of Venture Law Group.
   12.1    Computation of Ratio of Earnings to Fixed Charges of Collagen.
   23.1    Consent of Ernst & Young LLP (see Page II-8).
   23.2+   Consent of Venture Law Group.
   23.3+   Consent of Morrison & Foerster.
   24.1+   Powers of Attorney of certain directors and officers of Collagen.
   24.2+   Powers of Attorney of certain directors and officers of Target.
   25.1+   Form T-1 Statement of Eligibility and Qualification under the Trust Indenture
           Act of 1939 of the Trustee.
</TABLE>
    
 
---------------
 
* To be filed by amendment.
 
   
+ Previously filed.
    
 
                                      II-2
<PAGE>   174
 
ITEM 17.  UNDERTAKINGS
 
     Target hereby undertakes (1) to file, during any period in which offers or
sales are being made, a post-effective amendment to this registration statement
and to include any material information with respect to the plan of distribution
not previously disclosed in the registration statement or any material change to
such information in the registration statement, (2) that, for the purposes of
determining any liability under the Act, each such post-effective amendment
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof and (3) to remove from
registration by means of a post-effective amendment any of the securities being
registered which remain unsold at the termination of the offering.
 
     The undersigned Registrants hereby undertake that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrants' Annual Reports pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (as amended, the "Exchange Act") that is
incorporated by reference in this Registration Statement shall be deemed to be a
new registration statement relating to the securities offered herein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registrants pursuant to the foregoing provisions described in Item 15 above, or
otherwise, the Registrants have been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the Registrants of expenses incurred or paid by a director, officer or
controlling person of the Registrants in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrants will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question of whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.
 
     The undersigned Registrants hereby undertake (1) that for purposes of
determining any liability under the Act, the information omitted from the form
of prospectus filed as part of a registrant statement in reliance upon Rule 430A
and contained in a form of prospectus filed by the Registrants pursuant to Rule
424(b)(1) or (4) or 497(h) under the Act shall be deemed to be part of this
registration statement as of the time it was declared effective and (2) that for
the purpose of determining any liability under the Act, each post-effective
amendment that contains a form of prospectus shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at the time shall be deemed to be the initial bona
fide offering thereof.
 
                                      II-3
<PAGE>   175
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, Collagen
Corporation certifies that it has duly caused this Amendment No. 1 to
Registration Statement on Form S-3 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Palo Alto, State of
California, on the 28th day of March, 1995.
    
 
                                          COLLAGEN CORPORATION
 
                                          By     /s/  HOWARD D. PALEFSKY
 
                                            ------------------------------------
                                            (Howard D. Palefsky, Chairman of the
                                                            Board
                                              of Directors and Chief Executive
                                                          Officer)
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to Registration Statement on Form S-3 has been signed below by the
following persons in the capacities indicated on the 28th day of March, 1995.
    
 
   
<TABLE>
<CAPTION>
              SIGNATURE                                TITLE                       DATE
-------------------------------------    ---------------------------------    ---------------
<C>                                      <S>                                  <C>
       /s/  HOWARD D. PALEFSKY           Chairman of the Board and Chief      March 28, 1995
-------------------------------------    Executive Officer (Principal
        (Howard D. Palefsky)             Executive Officer)
 
      /s/  GARY S. PETERSMEYER*          President, Chief Operating           March 28, 1995
-------------------------------------    Officer and Director
        (Gary S. Petersmeyer)
          /s/  DAVID FOSTER              Vice President, Finance and MIS,     March 28, 1995
-------------------------------------    and Chief Financial Officer
           (David Foster)                (Principal Financial and
                                         Accounting Officer)
 
         /s/  REID W. DENNIS*            Chairman Emeritus of the Board       March 28, 1995
-------------------------------------
          (Reid W. Dennis)
 
         /s/  ANNE L. BAKAR*             Director                             March 28, 1995
-------------------------------------
           (Anne L. Bakar)
 
        /s/  JOHN R. DANIELS*            Director                             March 28, 1995
-------------------------------------
          (John R. Daniels)
</TABLE>
    
 
                                      II-4
<PAGE>   176
 
   
<TABLE>
<CAPTION>
              SIGNATURE                                TITLE                       DATE
-------------------------------------    ---------------------------------    ---------------
<C>                                      <S>                                  <C>
        /s/  WILLIAM G. DAVIS*           Director                             March 28, 1995
-------------------------------------
         (William G. Davis)
 
        /s/  CRAIG W. JOHNSON*           Director                             March 28, 1995
-------------------------------------
         (Craig W. Johnson)
 
      /s/  TERRY R. KNAPP, M.D.*         Director                             March 28, 1995
-------------------------------------
       (Terry R. Knapp, M.D.)
 
         /s/  MICHAEL F. MEE*            Director                             March 28, 1995
-------------------------------------
          (Michael F. Mee)
 
      /s/  RODNEY PERKINS, M.D.*         Director                             March 28, 1995
-------------------------------------
       (Rodney Perkins, M.D.)
 
   /s/CORNELIUS W. PETTINGA, PH.D.*      Director                             March 28, 1995
-------------------------------------
   (Cornelius W. Pettinga, Ph.D.)
 
       /s/  ROGER H. SALQUIST*           Director                             March 28, 1995
-------------------------------------
         (Roger H. Salquist)
 
    *By:  /s/  HOWARD D. PALEFSKY
        (Howard D. Palefsky,
          Attorney-in-Fact)
</TABLE>
    
 
                                      II-5
<PAGE>   177
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, Target
Therapeutics, Inc. has duly caused this Amendment No. 1 to Registration
Statement on Form S-3 to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Fremont, State of California, on the 28th day of
March 1995.
    
 
                                          TARGET THERAPEUTICS, INC.
 
                                          By        /s/  GARY R. BANG
 
                                            ------------------------------------
                                                       (Gary R. Bang,
                                               President and Chief Executive
                                                         Officer)
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to Registration Statement on Form S-3 has been signed below by the
following persons in the capacities indicated on the 28th day of March, 1995.
    
 
   
<TABLE>
<CAPTION>
              SIGNATURE                                TITLE                       DATE
-------------------------------------    ---------------------------------    ---------------
<C>                                      <S>                                  <C>
          /s/  GARY R. BANG              President and Chief Executive        March 28, 1995
-------------------------------------    Officer (Principal Executive
           (Gary R. Bang)                Officer)
 
      /s/  A. LARRY TANNENBAUM           Vice President, Finance and          March 28, 1995
-------------------------------------    Administration (Principal
        (A. Larry Tannenbaum)            Financial and Accounting
                                         Officer), Chief Financial Officer
                                         and Assistant Secretary
      /s/  CHARLES M. STROTHER*          Director                             March 28, 1995
-------------------------------------
        (Charles M. Strother)
 
        /s/  WILLIAM G. DAVIS*           Director                             March 28, 1995
-------------------------------------
         (William G. Davis)
 
        /s/  KATHLEEN MURRAY*            Director                             March 28, 1995
-------------------------------------
          (Kathleen Murray)
 
       /s/  HOWARD D. PALEFSKY*          Director                             March 28, 1995
-------------------------------------
        (Howard D. Palefsky)
</TABLE>
    
 
                                      II-6
<PAGE>   178
 
   
<TABLE>
<CAPTION>
              SIGNATURE                                TITLE                       DATE
-------------------------------------    ---------------------------------    ---------------
<C>                                      <S>                                  <C>
       /s/  RICHARD D. RANDALL*          Director                             March 28, 1995
-------------------------------------
        (Richard D. Randall)
 
       /s/  JOHN C. VILLFORTH*           Director                             March 28, 1995
-------------------------------------
         (John C. Villforth)
 
     *By      /s/  GARY R. BANG
  (Gary R. Bang, Attorney-in-Fact)
</TABLE>
    
 
                                      II-7
<PAGE>   179
 
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
   
     We consent to the reference to our firm under the captions "Experts,"
"Selected Consolidated Financial Data of Collagen" and "Selected Consolidated
Financial Data of Target" and to the use of our report dated August 3, 1994,
with respect to the consolidated financial statements of Collagen Corporation,
and our report dated April 27, 1994, with respect to the consolidated financial
statements of Target Therapeutics, Inc., included in Amendment No. 1 to the
joint Registration Statement (Form S-3) of Collagen Corporation and Target
Therapeutics, Inc.
    
 
   
     We also consent to the incorporation by reference therein of our report
with respect to the financial statement schedules of Collagen Corporation for
the years ended June 30, 1994, 1993 and 1992 included in the Annual Report (Form
10-K) for 1994 of Collagen Corporation and of our report with respect to the
financial statement schedules of Target Therapeutics, Inc. for the years ended
March 31, 1994, 1993 and 1992 included in the Annual Report (Form 10-K) for 1994
of Target Therapeutics, Inc., both filed with the Securities and Exchange
Commission.
    
 
                                          ERNST & YOUNG LLP
 
Palo Alto, California
   
March 28, 1995
    
 
                                      II-8
<PAGE>   180
 
               COLLAGEN CORPORATION AND TARGET THERAPEUTICS, INC.
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
EXHIBIT                                                                                PAGE
NUMBER                                  DESCRIPTION                                   NUMBER
------   -------------------------------------------------------------------------    ------
<C>      <S>                                                                          <C>
  1.1    Form of Underwriting Agreement...........................................
  4.1*   Form of Indenture by and between Collagen and The First National Bank of
         Boston, as Trustee (including Form of Note as Exhibit A).................
  4.2*   Form of Exchange Agent Agreement by and between Collagen and The First
         National Bank of Boston, as Exchange Agent...............................
  5.1*   Opinion of Venture Law Group.............................................
 12.1    Computation of Ratio of Earnings to Fixed Charges of Collagen............
 23.1    Consent of Ernst & Young LLP (see Page II-8).............................
 23.2+   Consent of Venture Law Group.............................................
 23.3+   Consent of Morrison & Foerster...........................................
 24.1+   Powers of Attorney of certain directors and officers of Collagen.........
 24.2+   Powers of Attorney of certain directors and officers of Target...........
 25.1+   Form T-1 Statement of Eligibility and Qualification under the Trust
         Indenture Act of 1939 of the Trustee.....................................
</TABLE>
    
 
---------------
 
* To be filed by amendment.
 
   
+ Previously filed.
    

<PAGE>   1
                                  $__________

                              COLLAGEN CORPORATION

                   % EXCHANGEABLE SUBORDINATED NOTES DUE 2002


                             UNDERWRITING AGREEMENT

                                                                          , 1995

ALEX. BROWN & SONS INCORPORATED
135 East Baltimore Street
Baltimore, Maryland 21202

Ladies & Gentlemen:

         Collagen Corporation, a Delaware corporation (the "Company"), proposes
to issue and sell to you (the "Underwriter") $__________ principal amount of
its __% Exchangeable Subordinated Notes due 2002 (the "Firm Notes").  The
Company also proposes to issue and sell at the Underwriter's option up to an
additional $__________ principal amount of its __% Exchangeable Subordinated
Notes due 2002 (the "Option Notes") as set forth below.  The Notes and the
Option Notes (to the extent the aforementioned option is exercised) are herein
collectively called the "Notes."

         The Notes are to be issued pursuant to the provisions of an Indenture
dated as of _______________, 1995 (the "Indenture") between the Company and
The First National Bank of Boston, as Trustee (the "Trustee").  The Notes are
exchangeable at the option of the holder for "Exchange Property" as defined in
the Indenture ("Exchange Property"), consisting initially of shares of Common
Stock ("Common Stock") of Target Therapeutics, Inc., a Delaware corporation
("Target"), owned by the Company and deposited by the Company with The
First National Bank of Boston in its capacity as Exchange Agent (the "Exchange
Agent") pursuant to the provisions of an Exchange Agreement dated as of
 _______________, 1995 (the "Exchange Agreement") between the Company and
the Exchange Agent.

         In consideration of the mutual agreements contained herein and of the
interests of the parties in the transactions contemplated hereby, the parties
hereto agree as follows:
<PAGE>   2
         1.      Representations and Warranties of the Company and Target.

                 (a)      The Company represents, warrants and agrees as
follows:

                          (i)      A registration statement on Form S-3 (File
         No. 33-_______) with respect to the Notes and the shares of Common
         Stock issuable upon conversion of the Notes (the "Exchange Stock") has
         been prepared by the Company and Target in conformity with the
         requirements of the Securities Act of 1933, as amended (the "Act"),
         and the rules and regulations (the "Rules and Regulations") of the
         Securities and Exchange Commission (the "Commission") promulgated
         thereunder and has been filed with the Commission under the Act.  The
         Company meets all of the requirements for use of Form S-3 under the
         Act and the Rules and Regulations.  Copies of such registration
         statement, including any amendments thereto, the preliminary
         prospectuses (meeting the requirements of Rule 430A of the Rules and
         Regulations), exhibits, financial statements and schedules contained
         therein, as finally amended and revised, have heretofore been
         delivered by the Company to you.  Such registration statement, herein
         referred to as the "Registration Statement," which, upon filing of the
         Prospectuses referred to below with the Commission, shall be deemed to
         include all information omitted therefrom in reliance upon Rule 430A
         and contained in the Prospectuses referred to below, has been declared
         effective by the Commission under the Act and no post-effective
         amendment to the Registration Statement has been filed as of the date
         of this Agreement.  The form of each prospectus first filed by the
         Company with the Commission pursuant to Rule 424(b) and Rule 430A, one
         of which relates to the offering of Notes and the other of which
         relates to the offering of shares of Common Stock of Target issuable
         upon exchange of the Notes, are herein referred to collectively as the
         "Prospectus."  Each preliminary prospectus included in the
         Registration Statement prior to the time it becomes effective is
         herein referred to as a "Preliminary Prospectus."

                          (ii)     Each of the Company and its majority owned 
         subsidiaries (together the "Company Subsidiaries") has been duly
         incorporated and is validly existing as a corporation in good standing
         under the laws of its jurisdiction of incorporation, with full
         corporate power and authority to own or lease its properties and
         conduct its business as described in the Registration Statement; each
         of the Company and the Company Subsidiaries is duly qualified to
         transact business in all jurisdictions in which the conduct of its
         business requires such qualification, except where the failure to
         qualify would not have a material adverse effect upon the business or
         property of the Company and the Company Subsidiaries taken as a whole. 
         The Company Subsidiaries are the Company's only subsidiaries; the
         Company's shares of the outstanding capital stock of the Company
         Subsidiaries are free and clear of all claims, liens, charges and
         encumbrances; all of the issued and outstanding shares of capital
         stock of the Company Subsidiaries have been duly authorized and
         validly issued and are fully paid and non-assessable.





                                       2.
<PAGE>   3
                          (iii)   The Indenture has been duly authorized,
         executed and delivered by the Company, is a valid and binding
         agreement of the Company enforceable against the Company in accordance
         with its terms and has been duly qualified under, and conforms to the
         requirements of, the Trust Indenture Act of 1939, as amended.

                          (iv)    The Notes have been duly authorized and, when
         executed and authenticated in accordance with the provisions of the
         Indenture and delivered to and paid for by the Underwriter in
         accordance with the terms of this Agreement, will be validly issued
         and outstanding, and valid and binding obligations of the Company
         enforceable in accordance with their terms and will be entitled to the
         benefits of the Indenture.

                          (v)     The Company has authorized and outstanding
         capital stock as set forth under the heading "Capitalization" in the
         Prospectus; the outstanding shares of Common Stock of the Company have
         been duly authorized and validly issued, are fully paid and
         non-assessable and have been issued in compliance with all federal and
         state securities laws; no stockholder of the Company has any right
         pursuant to any agreement that has not been waived to require the
         Company to register the sale of any shares owned by such stockholder
         under the Act in the public offering contemplated herein; all
         necessary and proper corporate proceedings have been taken by the
         Company in order to authorize the sale of the Notes and no further
         approval or authority of the Company or by the stockholders or the
         Board of Directors of Company is required for the sale of the Notes as
         contemplated herein.

                          (vi)    The Notes conform with the statements
         concerning them made in the Registration Statement.  

                          (vii)   The Company has not received from the  
         Commission any order preventing or suspending the use of any
         Preliminary Prospectus relating to the proposed offering of the Notes
         nor instituted or, to the knowledge of the Company, threatened
         instituting proceedings for that purpose.  Insofar as it relates to
         matters other than Target, the Registration Statement contains and the
         Prospectus and any amendments or supplements thereto will contain all
         statements which are required to be stated therein by, and in all
         respects conform or will conform, as the case may be, to the
         requirements of, the Act and the Rules and Regulations.  Neither the
         Registration Statement nor any amendment thereto, and neither the
         Prospectus nor any supplement thereto, contains or will contain, as
         the case may be, any untrue statement of a material fact or omits or
         will omit to state any material fact required to be stated therein or
         necessary to make the statements therein, in the light of the
         circumstances under which they were made, not misleading; provided,
         however, that the Company makes no representations or warranties as to
         information contained in or omitted from the Registration Statement or
         the Prospectus, or any such amendment or





                                       3.
<PAGE>   4
         supplement, (A) incorporated by reference from reports, exhibits,
         documents or registration statements of Target or appearing under the
         captions "Prospectus Summary - Target," "Risk Factors - Risk Factors
         Relating to Target," "Price Range of Target Common Stock and Dividend
         Policy," "Selected Consolidated Financial Data of Target,"
         "Management's Discussion and Analysis of Financial Condition and
         Results of Operations of Target," "Business of Target," "Management of
         Target," "Description of Target Common Stock," and "Target Financial
         Statements" (collectively, the "Target Information") or (B) contained
         or omitted in reliance upon, and in conformity with, written
         information furnished to the Company by the Underwriter specifically
         for use in the preparation thereof.

                          (viii)  The consolidated financial statements of the 
         Company, taken as a whole, together with related notes and schedules
         as set forth in the Registration Statement, present fairly the
         consolidated financial position and the consolidated results of
         operations of the Company and the Company Subsidiaries, at the
         indicated dates and for the indicated periods.  Such financial
         statements, schedules and related notes have been prepared in
         accordance with generally accepted accounting principles, consistently
         applied throughout the periods involved, and all adjustments necessary
         for a fair presentation of results for such periods have been made. 
         The summary financial and statistical data and schedules of the
         Company included in the Registration Statement present fairly the
         information shown therein and have been compiled on a basis consistent
         with the financial statements presented therein.  No other financial
         statements or schedules of the Company are required to be included in
         the Registration Statement.

                          (ix)    There is no action, suit or proceeding
         pending or, to the knowledge of the Company, after due inquiry,
         threatened against the Company or any of the Company Subsidiaries
         before any court or regulatory, governmental or administrative agency
         or body that could reasonably be expected to result in any material
         adverse change in the business or condition (financial or otherwise)
         or results of operations of the Company and the Company Subsidiaries,
         taken as a whole, except as specifically described in the Registration
         Statement.  Neither the Company nor any of the Company Subsidiaries is
         a party or subject to the provisions of any injunction, judgment,
         decree or order of any court, regulatory body, administrative agency
         or other governmental body that could reasonably be expected to result
         in any material adverse change in the business condition (financial or
         otherwise) or results of operations of the Company and the Company
         Subsidiaries, taken as a whole.

                          (x)     The Company and each of the Company
         Subsidiaries has good and marketable title to all of the properties
         and assets owned by it reflected in either the financial statements or
         as described in the Registration Statement and is subject to no lien,
         mortgage, security interest, pledge or encumbrance (other than
         easements, if any) of any kind, except those reflected in such
         financial statements or as described in the Registration Statement and
         except for such encumbrances that, individually or in the





                                       4.
<PAGE>   5
         aggregate, would not have a material adverse effect on the Company and
         the Company Subsidiaries, taken as a whole.  The Company and each of
         the Company Subsidiaries occupies its leased properties under valid and
         binding leases conforming to the description thereof set forth in the
         Registration Statement.

                          (xi)    The Company and each of the Company
         Subsidiaries has filed all foreign, federal, state and local income
         tax returns that have been required to be filed and has paid all
         taxes indicated by said returns and all assessments received by it. 
         There is no tax deficiency that has been or might reasonably be
         expected to be asserted or threatened against the Company or any of
         the Company Subsidiaries that could materially adversely affect the
         business operations or property of the Company and the any of the
         Company Subsidiaries, taken as a whole.  The Company and each of the
         Company Subsidiaries has paid all sales, use and transfer taxes
         applicable to it and its business and operations that were or are due. 
         Neither the Company nor any of the Company Subsidiaries has received
         any notice of deficiency or claim for payment from any governmental or
         regulatory body with respect to such sales, use or transfer taxes
         which relates to liabilities that are individually, or in the
         aggregate, material to the Company's consolidated financial condition.

                          (xii)   Since the respective dates as of which 
         information is given in the Registration Statement, as it may be
         amended or supplemented, (a) there has not been any material
         adverse change or development involving a prospective material adverse
         change in or affecting the condition, financial or otherwise, of the
         Company and the Company Subsidiaries, taken as a whole, or the
         earnings, business affairs or management, of the Company or the
         Company Subsidiaries, whether or not occurring in the ordinary course
         of business, (b) there has not been any material transaction entered
         into by the Company or any of the Company Subsidiaries, other than
         transactions in the ordinary course or transactions specifically
         described in the Registration Statement, as it may be amended or
         supplemented, (c) neither the Company nor any of the Company
         Subsidiaries has sustained any material loss or interference with its
         businesses or properties from fire, flood, windstorm, accident or
         other calamity, not covered by insurance, (d) neither the Company nor
         any of the Company Subsidiaries has paid or declared any dividends or
         other distribution with respect to its capital stock, except as
         described in the Registration Statement, and the Company is not in
         default in the payment of principal of or interest on any outstanding
         debt obligations and (e) there has not been any change in the capital
         stock (other than the exercise or grant of stock options or purchase
         of shares pursuant to the Company's stock option and stock purchase
         plans described in the Registration Statement) or material increase in
         indebtedness of the Company.  Neither the Company nor any of the
         Company Subsidiaries has any material contingent obligation that is
         not disclosed in the Registration Statement (or contained in the
         financial statements or related notes thereto), as such may be amended
         or supplemented.

                          (xiii)  Neither the Company nor any of the Company
         Subsidiaries is in violation or default under any provision of its
         certificate of incorporation or bylaws, or any of its agreements,
         leases, licenses, contracts, franchises, mortgages, permits, deeds





                                       5.
<PAGE>   6
         of trust, indentures or other instruments or obligations to which the
         Company or any of the Company Subsidiaries is a party or by which it or
         any of its properties is bound or may be affected, except where such
         violation or default would not have a material adverse effect on the
         business or financial condition of the Company or any of the Company
         Subsidiaries, taken as a whole.

                          (xiv)   The execution and performance of this
         Agreement and the consummation of the transactions contemplated herein
         and in the Indenture and the Exchange Agreement do not and will not
         conflict with or result in a breach of, or violation of, any of the
         terms or provisions of, or constitute, either by itself or upon notice
         or the passage of time or both, a default under, any indenture,
         license, mortgage, lease, franchise, permit, deed of trust or other
         agreement or instrument to which the Company or any of the Company
         Subsidiaries is a party or by which the Company or any of the Company
         Subsidiaries or any of their property may be bound or affected, except
         where such breach, violation or default would not have a material
         adverse effect on the business or financial condition of the Company
         and the Company Subsidiaries, taken as a whole, or violate any of the
         provisions of the certificate of incorporation or bylaws of the
         Company or any of the Company Subsidiaries, or violate any order,
         judgment, statute, rule or regulation applicable to the Company or the
         Company Subsidiaries of any court or of any regulatory, administrative
         or governmental body or agency having jurisdiction over the Company or
         any of the Company Subsidiaries or any of their property.

                          (xv)    The Company has the legal right, corporate
         power and authority to enter into this Agreement, the Indenture and
         Exchange Agreement and perform the transactions contemplated hereby
         and thereby.  This Agreement, the Indenture and the Exchange Agreement
         have been duly authorized, executed and delivered by the Company and
         are enforceable in accordance with their terms.

                          (xvi)   Each approval, registration, qualification,
         license, permit, consent, order, authorization, designation,
         declaration or filing by or with any regulatory, administrative or
         other governmental body or agency necessary in connection with the
         execution and delivery by the Company of this Agreement, the Indenture
         and the Exchange Agreement and the consummation of the transactions
         contemplated herein and therein (except such additional steps as may
         be required by the National Association of Securities Dealers, Inc.
         (the "NASD") or may be necessary to qualify the Notes for public
         offering by the Underwriter under state securities or Blue Sky laws)
         has been obtained or made and each is in full force and effect.

                          (xvii)  Except as otherwise expressly described in
         the Registration Statement, the Company owns or possesses adequate and
         sufficient rights to use all patents, patent rights, trade secrets,
         licenses or royalty arrangements, trademarks and trademark rights,
         service marks, trade names, copyrights, know how or proprietary





                                       6.
<PAGE>   7
         techniques or rights thereto of others, and governmental,
         regulatory or administrative authorizations, orders, permits,
         certificates and consents necessary for the conduct of the business of
         the Company and the Company Subsidiaries, except where the failure to
         possess such would not have a material adverse effect on the business
         or financial condition of the Company and the Company Subsidiaries
         taken as a whole; except as otherwise expressly disclosed in the
         Registration Statement, the Company is not aware of any material
         pending or threatened action, suit, proceeding or claim by others,
         either domestically or internationally, that the Company or any of the
         Company Subsidiaries is violating any patents, patent rights,
         copyrights, trademarks or trademark rights, inventions, service marks,
         trade names, licenses or royalty arrangements, trade secrets, know how
         or proprietary techniques or rights thereto of others, or
         governmental, regulatory or administrative authorizations, orders,
         permits, certificates and consents; except as otherwise expressly
         disclosed in the Registration Statement, the Company is not aware of
         any rights of third parties to, or any infringement of, any of the
         Company's trademarks or trademark rights, copyrights, licenses or
         royalty arrangements, trade secrets, know how or proprietary
         techniques, including processes and substances, or rights thereto of
         others, that could materially adversely affect the use thereof by the
         Company; except as otherwise expressly disclosed in  the Registration
         Statement, the Company is not aware of any pending or threatened
         material action, suit, proceeding or claim by others challenging the
         validity or scope of any of such trademarks or trademark rights,
         copyrights, licenses or royalty arrangements, trade secrets, know how
         or proprietary techniques, including processes and substances, or
         rights thereto of others, that could materially adversely affect the
         use thereof by the Company.

                          (xviii) There are no contracts or other documents
         required to be described in the Registration Statement or to be filed
         as exhibits to the Registration Statement by the Act or by the Rules
         and Regulations that have not been described or filed as required.

                          (xix)   The Company and each of the Company
         Subsidiaries is conducting business in compliance with all applicable
         laws, rules and regulations of the jurisdictions in which it is
         conducting business including, without limitation, all applicable
         local, state, federal and foreign environmental laws and regulations,
         except where the failure to so comply would not have a material
         adverse effect on the business or financial condition of the Company
         and the Company Subsidiaries, taken as a whole.

                          (xx)    Neither the Company nor any of the Company
         Subsidiaries has directly or indirectly, at any time (i) made any
         unlawful contributions to any candidate for public office, or failed
         to disclose fully any contribution in violation of law, or (ii) made
         any payment to any federal or state governmental officer or official,
         or other person charged with similar public or quasi-public duties,
         other than payments required or permitted by the laws of the United
         States or any jurisdiction thereof.





                                       7.
<PAGE>   8

                          (xxi)   The Company and each of the Company
         Subsidiaries maintains insurance of the types and in the amounts
         reasonably adequate for its business, including, but not limited to,
         general liability insurance and insurance covering all real and
         personal property owned or leased by the Company and each of the
         Company Subsidiaries against theft, damage, destruction, acts of
         vandalism and all other risks customarily insured against, all of the
         which insurance is in full force and effect.

                          (xxii)  Ernst & Young LLP, who have audited the
         consolidated financial statements of the Company filed with the 
         Commission as part of the Registration Statement, are independent 
         auditors as required by the Act and the Rules and Regulations.

                          (xxiii) The Company has and at the Closing Date (as
         hereinafter defined) will have (a) good, marketable and valid title to
         all the Exchange Shares delivered by the Company to the Exchange Agent
         pursuant to the Indenture and the Exchange Agreement and (b) full
         right, power and authority to enter into the Indenture and the
         Exchange Agreement and to assign, transfer and deliver such Exchange
         Shares, free of any voting trust arrangements, liens, encumbrances,
         security interests, equities and claims; and the Company has deposited
         with the Exchange Agent certificates in negotiable form for the
         Exchange Shares as provided in the Indenture; the Exchange Shares if
         and when delivered upon exchange of the Notes in accordance with the
         terms of the Indenture, will be duly and validly issued, fully paid
         and nonassessable, and good and valid title thereto, free of any
         liens, encumbrances, security interests, equities and claims, will be
         transferred to the persons entitled to receive such Exchange Shares
         under the Indenture (assuming that they are bona fide purchasers
         within the meaning of the Uniform Commercial Code).

                          (xxiv)  The Company has reviewed carefully the Target
         Information disclosed in the Registration Statement and nothing has
         come to the Company's attention that leads it to believe that the
         Target Information included in the Registration Statement, or any
         amendment thereto, at the time the Registration Statement or amendment
         became effective, contained an untrue statement of a material fact or
         omitted to state a material fact required to be stated therein or
         necessary to make the statements therein, in light of the
         circumstances under which they were made, not misleading.

                          (xxv)   The Company is not an "investment Company"
         within the Investment Company Act of 1940, as amended.

                 (b)      Target represents, warrants and agrees as follows:

                          (i)     The Target Information has been prepared by
         Target in conformity with the requirements of the Act and the Rules
         and Regulations and has been filed with the Commission under the Act.
         Target meets all requirements for use of Form S-3 under the Act.
         Copies of such registration statement, including any amendments
         thereto, the





                                       8.
<PAGE>   9
         preliminary prospectuses (meeting the requirements of Rule 430A of the
         Rules and Regulations), exhibits, financial statements and schedules
         contained therein, as finally amended and revised, have heretofore
         been delivered by the Company to you.  The Registration Statement has
         been declared effective by the Commission under the Act and no
         post-effective amendment to the Registration Statement has been filed
         as of the date of this Agreement.

                (ii)     Each of Target and its majority owned subsidiaries
         (collectively, the "Target Subsidiaries") and Target-CMI, Inc. (the
         "Joint Venture")  has been duly incorporated and is validly existing
         as a corporation in good standing under the laws of its jurisdiction
         of incorporation, with full corporate power and authority to own or
         lease its properties and conduct its business as described in the
         Registration Statement; each of Target, the Target Subsidiaries and
         the Joint Venture is duly qualified to transact business in all
         jurisdictions in which the conduct of its business requires such
         qualification, except where the failure to qualify would not have a
         material adverse effect upon the business or property of Target and
         the Target Subsidiaries, taken as a whole.  Except for the Joint
         Venture, Target's shares of the outstanding capital stock of the
         Target Subsidiaries are free and clear of all claims, liens, charges
         and encumbrances; all of the issued and outstanding shares of capital
         stock of the Target Subsidiaries have been duly authorized and validly
         issued and are fully paid and non-assessable.  Target owns 50% of the
         outstanding capital stock of the Joint Venture free and clear of all
         claims, liens, charges and encumbrances; the issued and outstanding
         shares of the Joint Venture owned by the Company have been duly
         authorized and validly issued and are fully paid and non-assessable.

                (iii)   Target has authorized and outstanding capital stock as
         set forth under the heading "Description of the Target Common Stock"
         in the Prospectus; the outstanding shares of Common Stock of Target
         (including the Exchange Shares) have been duly authorized and validly
         issued, free for preemptive or similar rights, are fully paid and non-
         assessable and have been issued in material compliance with all
         federal and state securities laws; no stockholder of Target has any
         right pursuant to any agreement that has not been waived to require
         Target to register the sale of any shares owned by such stockholder
         under the Act in the public offering contemplated herein; all
         necessary and proper corporate proceedings have been taken by Target
         in order to authorize the sale of the Common Stock and no further
         approval or authority of the Company or by the stockholders or the
         Board of Directors of Target is required for the Exchange Shares to be
         exchanged for the Notes as contemplated herein.

                          (iv)    The Common Stock conforms with the statements
         concerning such stock made in the Registration Statement in all
         material respects.  Except as specifically disclosed in the
         Registration Statement and the financial statements of Target and the
         related notes thereto, Target does not have outstanding any options to
         purchase, or any preemptive rights or other rights to subscribe for or
         to purchase, any securities or





                                       9.
<PAGE>   10
         obligations convertible into, or any contracts or commitments to issue
         or sell shares of its capital stock or any such options, rights,
         convertible securities or obligations.  The descriptions of Target's
         stock option and other stock-based plans, and of the options or other
         rights granted and exercised thereunder, set forth in the Prospectus,
         are accurate summaries and fairly present the information required to
         be shown with respect to such plans and rights in all material
         respects.

                (v)     Target has not received from the Commission any order
         preventing or suspending the use of any Preliminary Prospectus
         relating to the proposed registration of the Target Common Stock nor
         instituted or, to the knowledge of Target, threatened instituting
         proceedings for that purpose.  Insofar as it relates to Target, the
         Registration Statement contains and the Prospectus and any amendments
         or supplements thereto will contain all statements which are required
         to be stated therein by, and in all respects conform or will conform,
         as the case may be, to the requirements of, the Act and the Rules and
         Regulations.  Neither the Registration Statement nor any amendment
         thereto, and neither the Prospectus nor any supplement thereto,
         contains or will contain, as the case may be, any untrue statement of
         a material fact or omits or will omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein, in the light of the circumstances under which they were made,
         not misleading; provided, however, that Target makes no
         representations or warranties as to information contained in or
         omitted from the Registration Statement or the Prospectus, or any such
         amendment or supplement, other than the Target Information.

                (vi)    The consolidated financial statements of Target and the
         Target Subsidiaries, taken as a whole, together with related notes and
         schedules as set forth in the Registration Statement, present fairly
         the consolidated financial position and the consolidated results of
         operations of Target and the Target Subsidiaries, at the indicated
         dates and for the indicated periods.  Such financial statements,
         schedules and related notes have been prepared in accordance with
         generally accepted accounting principles, consistently applied
         throughout the periods involved, and all adjustments necessary for a
         fair presentation of results for such periods have been made.  The
         summary financial and statistical data and schedules included in the
         Target Information, present fairly the information shown therein and
         have been compiled on a basis consistent with the financial statements
         presented therein.  No other financial statements or schedules
         relating to Target are required to be included in the Registration
         Statement.
        
                (vii)   There is no action, suit or proceeding pending or, to
         the knowledge of Target, after due inquiry, threatened against Target
         or the Target Subsidiaries before any court or regulatory,
         governmental or administrative agency or body that could reasonably be
         expected to result in any material adverse change in the business or
         condition financial or otherwise) or





                                      10.
<PAGE>   11
         results of operations of Target and the Target Subsidiaries,
         taken as a whole, except as specifically described in the Registration
         Statement.  Neither Target nor any of the Target Subsidiaries is a
         party or subject to the provisions of any injunction, judgment, decree
         or order of any court, regulatory body, administrative agency or other
         governmental body that could reasonably be expected to result in any
         material adverse change in the business condition (financial or
         otherwise) or results of operations of Target and the Target
         Subsidiaries taken as a whole.

                          (viii)  Target and each of the Target Subsidiaries
         has good and marketable title to all of the properties and assets
         owned by it reflected in either the financial statements or as
         described in the Registration Statement and is subject to no lien,
         mortgage, security interest, pledge or encumbrance (other than
         easements, if any) of any kind, except those reflected in such
         financial statements or as described in the Registration Statement and
         except for such encumbrances that, individually or in the aggregate,
         would not have a material adverse effect on the Target and the Target
         Subsidiaries, taken as a whole.  Target and each of the Target
         Subsidiaries occupies its leased properties under valid and binding
         leases conforming to the description thereof set forth in the
         Registration Statement.

                          (ix)    Target and each of the Target Subsidiaries
         has filed all foreign, federal, state and local income tax returns
         that have been required to be filed and has paid all taxes indicated
         by said returns and all assessments received by it.  There is no tax
         deficiency that has been or might reasonably be expected to be
         asserted or threatened against Target or of the Target Subsidiaries
         that could materially adversely affect the business operations or
         property of Target and the Target Subsidiaries, taken as a whole.
         Target and each of the Target Subsidiaries has paid all sales, use and
         transfer taxes applicable to it and its business and operations that
         were or are due.  Neither Target nor the Target Subsidiaries has
         received any notice of deficiency or claim for payment from any
         governmental or regulatory body with respect to such sales, use or
         transfer taxes which relates to liabilities that are, individually or
         in the aggregate, material to Target's consolidated 
         financial condition.

                          (x)     Since the respective dates as of which
         information is given in the Registration Statement, as it may be
         amended or supplemented, (a) there has not been any material adverse
         change or development involving a prospective material adverse change
         in or affecting the condition, financial or otherwise, of Target and
         the Target Subsidiaries, taken as a whole, or the earnings, business
         affairs or management of Target or the Target Subsidiaries, whether or
         not occurring in the ordinary course of business, (b) there has not
         been any material transaction entered into by Target or the Target
         Subsidiaries, other than transactions in the ordinary course or
         transactions specifically described in the Registration Statement, as
         it may be amended or supplemented, (iii) neither Target nor the Target
         Subsidiaries has sustained any material loss or interference with its
         businesses or properties from fire, flood, windstorm, accident or
         other calamity, not covered by insurance, (iv) neither Target nor the
         Target Subsidiaries has paid or declared any dividends or other
         distribution with respect to its capital stock, except as described in
         the Registration Statement, and Target is not in default in the
         payment of principal of or interest on any outstanding debt
         obligations and (v) there has not been any change in the





                                      11.
<PAGE>   12
         capital stock (other than the exercise or grant of stock
         options or purchase of shares pursuant to the Target's stock option
         and stock purchase plans described in the Registration Statement) or
         material increase in indebtedness of Target. Neither Target nor the
         Target Subsidiaries has any material contingent obligation that is not
         disclosed in the Registration Statement (or contained in the financial
         statements or related notes thereto), as such may be amended or
         supplemented.

                          (xi)    Neither Target nor the Target Subsidiaries is
         in violation or default under any provision of its certificate of
         incorporation or bylaws, or any of its agreements, leases, licenses,
         contracts, franchises, mortgages, permits, deeds of trust, indentures
         or other instruments or obligations to which Target or the Target
         Subsidiaries is a party or by which it or any of its properties is
         bound or may be affected, except where such violation or default would
         not have a material adverse effect on the business or financial
         condition of Target or the Target Subsidiaries.

                          (xii)   The execution and performance of this
         Agreement and the consummation of the transactions herein contemplated
         do not and will not conflict with or result in a breach of, or
         violation of, any of the terms or provisions of, or constitute, either
         by itself or upon notice or the passage of time or both, a default
         under, any indenture, license, mortgage, lease, franchise, permit,
         deed of trust or other agreement or instrument to which Target or the
         Target Subsidiaries is a party or by which the Target or the Target
         Subsidiaries or any of their property may be bound or affected, except
         where such breach, violation or default would not have a material
         adverse effect on the business or financial condition of Target and
         the Target Subsidiaries, taken as a whole, or violate any of the
         provisions of the certificate of incorporation or bylaws of the Target
         or the Target Subsidiaries, or violate any order, judgment, statute,
         rule or regulation applicable to Target or the Target Subsidiaries of
         any court or of any regulatory, administrative or governmental body or
         agency having jurisdiction over Target or the Target Subsidiaries or
         any of their property.

                          (xiii)  Target has the legal right, corporate power
         and authority to enter into this Agreement and perform the
         transactions contemplated hereby.  This Agreement has been duly
         authorized, executed and delivered by Target.

                          (xiv)   Each approval, registration, qualification,
         license, permit, consent, order, authorization, designation,
         declaration or filing by or with any regulatory, administrative or
         other governmental body or agency necessary in connection with the
         execution and delivery by Target of this Agreement and the
         consummation of the transactions herein contemplated (except such
         additional steps as may be required by the NASD or may be necessary to
         qualify the Target Common Stock for public offering by the Underwriter
         under state securities or Blue Sky laws) has been obtained or made and
         each is in full force and effect.
        




                                      12.
<PAGE>   13
        
                (xv)    Except as otherwise expressly described in the
         Registration Statement, Target owns or possesses adequate and
         sufficient rights to use all patents, patent rights, trade secrets,
         licenses or royalty arrangements, trademarks and trademark rights,
         service marks, trade names, copyrights, know how or proprietary
         techniques or rights thereto of others, and governmental, regulatory
         or administrative authorizations, orders, permits, certificates and
         consents necessary for the conduct of the business of Target and the
         Target Subsidiaries, except where the failure to possess such would
         not have a material adverse effect on the business or financial
         condition of Target and the Target Subsidiaries, taken as a whole;
         except as otherwise expressly disclosed in the Registration Statement
         Target is not aware of any material pending or threatened action,
         suit, proceeding or claim by others, either domestically or
         internationally, that Target or the Target Subsidiaries is violating
         any patents, patent rights, copyrights, trademarks or trademark
         rights, inventions, service marks, trade names, licenses or royalty
         arrangements, trade secrets, know how or proprietary techniques or
         rights thereto of others, or governmental, regulatory or
         administrative authorizations, orders, permits, certificates and
         consents; except as otherwise expressly described in the Registration
         Statement, Target is not aware of any rights of third parties to, or
         any infringement of, any of Target's trademarks or trademark rights,
         copyrights, licenses or royalty arrangements, trade secrets, know how
         or proprietary techniques, including processes and substances, or
         rights thereto of others, that could materially adversely affect the
         use thereof by Target; except as otherwise expressly disclosed in the
         Registration Statement Target is not aware of any pending or
         threatened material action, suit, proceeding or claim by others
         challenging the validity or scope of any of such trademarks or
         trademark rights, copyrights, licenses or royalty arrangements, trade
         secrets, know how or proprietary techniques, including processes and
         substances, or rights thereto of others, that could materially
         adversely affect the use thereof by Target.

                          (xvi)   There are no contracts or other documents
         relating to Target required to be described in the Registration
         Statement or to be filed as exhibits to the Registration Statement by
         the Act or by the Rules and Regulations that have not been described
         or filed as required.

                          (xvii)  Target and the Target Subsidiaries are
         conducting business in compliance with all applicable laws, rules and
         regulations of the jurisdictions in which each of them is conducting
         business including, without limitation, all applicable local, state,
         federal and foreign environmental laws and regulations, except where
         the failure to so comply would not have a material adverse effect on
         the business or financial condition of Target and the Target
         Subsidiaries, taken as a whole.

                          (xviii) Neither Target nor the Target Subsidiaries
         has directly or indirectly, at any time (i) made any unlawful
         contributions to any candidate for public





                                      13.
<PAGE>   14
         office, or failed to disclose fully any contribution in violation of
         law, or (ii) made any payment to any federal or state governmental
         officer or official, or other person charged with similar public or
         quasi-public duties, other than payments required or permitted by the
         laws of the United States or any jurisdiction thereof.

                          (xix)   Target and each of the Target Subsidiaries
         maintains insurance of the types and in the amounts reasonably
         adequate for its business, including, but not limited to, general
         liability insurance and insurance covering all real and personal
         property owned or leased by Target and each of the Subsidiaries
         against theft, damage, destruction, acts of vandalism and all other
         risks customarily insured against, all of the which insurance is in
         full force and effect.

                          (xx)    Ernst & Young LLP, who have audited the
         consolidated financial statements of Target filed with the Commission
         as part of the Registration Statement, are independent auditors 
         as required by the Act and the Rules and Regulations.

                          (xxi)   Target's Common Stock is currently authorized
         for trading on the National Association of Securities Dealers Nasdaq
         National Market.

         2.      Purchase, Sale and Delivery of the Notes.  On the basis of the
representations, warranties and covenants herein contained, and subject to the
conditions herein set forth, the Company agrees to sell to the Underwriter and
the Underwriter agrees to purchase the Firm Notes at the purchase price of ___%
of the principal amount thereof.

                 Payment for the Notes to be sold hereunder is to be made in
New York Clearing House (next-day) funds by certified or bank cashier's
check(s) drawn to the order of the Company, delivery of certificates therefor
to the Underwriter.  Such payment and delivery are to be made at the offices of
Alex. Brown & Sons Incorporated, 135 East Baltimore Street, Baltimore,
Maryland, at 10:00 A.M., Baltimore time, on the fifth business day after the
date of this Agreement or at such other time and date not later than five
business days thereafter as you and the Company shall agree upon, such time and
date being herein referred to as the "Closing Date."  (As used herein,
"business day" means a day on which the New York Stock Exchange, Inc. is open
for trading and on which banks in New York are open for business and not
permitted by law or executive order to be closed.)  The certificates for the
Notes will be delivered in denominations of $1,000 and integral multiples
thereof and will be made available for inspection by the Underwriter at least
one business day prior to the Closing Date.

                 In addition, on the basis of the representations and
warranties herein contained and subject to the terms and conditions herein set
forth, the Company grants an option to the Underwriter to purchase the Option
Notes at the price set forth in the first paragraph of this Section 2.  The
option granted hereby may be exercised in whole or in part but only once and at
any time upon written notice given within 30 days after the date of the
Prospectus, by you to the Company setting forth the principal amount of Option
Notes as to which the Underwriter is





                                      14.
<PAGE>   15
exercising the option, the names and denominations in which the Option Notes are
to be registered and the time and date at which such certificates are to be
delivered.  The time and date at which certificates for the Option Notes are to
be delivered shall be determined by the Underwriter but shall not be earlier
than three nor later than ten full business days after the exercise of such
option, nor in any event prior to the Closing Date (such time and date being
herein referred to as the "Option Closing Date").  If the date of exercise of
the option is three or more days before the Closing Date, the notice of exercise
shall set the Closing Date as the Option Closing Date.  The option with respect
to the Option Notes granted hereunder may be exercised only to cover over-
allotments in the sale of the Notes by the Underwriter.  You may cancel such
option at any time prior to its expiration by giving written notice of such
cancellation to the Company.  To the extent, if any, that the option is
exercised, payment for the Option Notes shall be made on the Option Closing Date
in New York Clearing House next-day funds by certified or bank cashier's
check(s) drawn to the order of the Company against delivery of certificates
therefor at the offices of Alex. Brown & Sons Incorporated, 135 East Baltimore
Street, Baltimore, Maryland.

         3.      Offering by the Underwriter.  It is understood that the
Underwriter is to make a public offering of the Notes as soon as it deems it
advisable to do so.  The Firm Notes are to be initially offered to the public
at the initial public offering price set forth in the Prospectus.  The
Underwriter may from time to time thereafter change the public offering price
and other selling terms.  To the extent, if at all, that any Option Notes are
purchased pursuant to Section 2 hereof, the Underwriter will offer them to the
public on the foregoing terms.

         4.      Covenants of the Company and Target.  Each of the Company and
Target covenant and agree with the Underwriter that:

                 (a)      The Company and Target will (i) prepare and timely
file with the Commission under Rule 424(b) of the Rules and Regulations a
prospectus containing information previously omitted at the time of
effectiveness of the Registration Statement in reliance on Rule 430A of the
Rules and Regulations and (ii) not file any amendment to the Registration
Statement or supplement to the Prospectus of which the Underwriter shall not
previously have been advised and furnished with a copy or to which the
Underwriter shall have reasonably objected in writing or that is not in
compliance with the Rules and Regulations.

                 (b)      The Company and Target will advise the Underwriter
and its counsel promptly of any request of the Commission for amendment of the
Registration Statement or for supplement to the Prospectus or for any
additional information, or of the issuance by the Commission of any stop order
suspending the effectiveness of the Registration Statement or the use of the
Prospectus or of the institution of any proceedings for the purpose, and the
Company and Target will use their respective best efforts to prevent the
issuance of any such stop order preventing or suspending the use of the
Prospectus and to obtain as soon as possible the lifting thereof, if issued.





                                      15.
<PAGE>   16
                 (c)      The Company and Target will cooperate with the
Underwriter in endeavoring to qualify the Notes and the Target Common Stock for
sale under the securities laws of such jurisdictions as the Underwriter may
have designated in writing and will make such applications, file such
documents, and furnish such information as may be required for that purpose,
provided that neither the Company not Target shall not be required to qualify
as a foreign corporation or to file a general consent to service of process in
any jurisdiction where it is not now so qualified or required to file such a
consent.  The Company and Target will, from time to time, prepare and file such
statements, reports, and other documents, as are or may be required to continue
such qualifications in effect for so long a period as the Underwriter may
request for distribution of the Notes.

                 (d)      The Company will deliver to, or upon the order of,
the Underwriter, from time to time, as many copies of any Preliminary
Prospectus as the Underwriter may reasonably request.  The Company will deliver
to, or upon the order of, the Underwriter during the period when delivery of a
Prospectus is required under the Act, as any copies of the Prospectus in final
form, or as thereafter amended or supplemented, as the Underwriter may
reasonably request.  The Company and Target will deliver to the Underwriter at
or before the Closing Date, four signed copies of the Registration Statement
and all amendments thereto including all exhibits filed therewith, and will
deliver to the Underwriter such number of copies of the Registration Statement
but without exhibits, and of all amendments thereto, as the Underwriter may
reasonably request.

                 (e)      If during the period in which a Prospectus is
required by law to be delivered by the Underwriter or dealer any event shall
occur as a result of which, in the judgment of the Company or in the opinion of
the Underwriter, it becomes necessary to amend or supplement the Prospectus
relating to the Notes in order to make the statements therein in light of the
circumstances existing at the time such Prospectus is delivered to a purchaser,
not misleading, or, if it is necessary at any time to amend or supplement the
Prospectus relating to the Notes to comply with any law, the Company and Target
promptly will prepare and file with the Commission an appropriate amendment to
the Registration Statement or supplement to such Prospectus so that such
Prospectus as so amended or supplemented will not, in light of circumstances
when it is so delivered, be misleading, or so that such Prospectus will comply
with law.

                 (f)      The Company and Target will make generally available
to their respective security holders, as soon as it is practicable to do so,
but in any event not later than 15 months after the effective date of the
Registration Statement, an earnings statement (that need not be audited) in
reasonable detail, covering a period of at least 12 consecutive months
beginning after the effective date of the Registration Statement, which
earnings statement shall satisfy the requirements of Section 11(a) of the Act
and Rule 158 of the Rules and Regulations, and the Company will advise you in
writing when such statement has been so made available.





                                      16.
<PAGE>   17
                 (g)      The Company and Target will, for so long as any Notes
are outstanding, but in no event less than five years from the Closing Date,
deliver to the Underwriter copies of annual reports and copies of all other
documents, reports and information furnished by the Company and Target to their
respective stockholders or filed with any securities exchange pursuant to the
requirements of such exchange or with the Commission pursuant to the Act or the
Securities Exchange Act of 1934, as amended (the "Exchange Act").  The Company
and Target will deliver to the Underwriter similar reports with respect to
significant subsidiaries, as that term is defined in the Rules and Regulations,
that are not consolidated in the Company's or Target's respective financial
statements.

                 (h)      Neither the Company nor Target will offer, sell or
otherwise dispose of any Shares of Common Stock (or securities convertible 
into Common Stock) for a period of 90 days after the date of this Agreement, 
directly or indirectly, other than (A) with the prior written consent
of the Underwriter or (B) pursuant to the grant by Target of stock options under
Target's stock option plans, the exercise of stock options covered under such
plans or the sale of shares under Target's stock purchase plan described in the
Registration Statement or (C) in exchange for Notes in accordance with the terms
of the Indenture and the Exchange Agreement.

                 (i)      The Company and Target will use their best efforts 
to cause the Notes to be authorized for quotation on the Nasdaq SmallCap Market 
and to continuously maintain such listing as long as any of the Notes remain
outstanding.
        
                 (j)      Subject to the provisions of subsection 4(k), 
Target will, for so long as any Notes remain outstanding and exchangeable
for shares of Target Common Stock, (i) prepare and file with the Commission such
post-effective amendments to the Registration Statement as may be necessary to
keep the Registration Statement effective; (ii) cause the Prospectus to be
supplemented by any required prospectus supplement, and as so supplemented to be
filed pursuant to Rule 424 of the Rules and Regulations (or any similar
provisions then in force); (iii) in all other respects comply with the Act and
the Rules and Regulations with respect to the exchange of Notes for Exchange
Property in accordance with the terms of the Indenture; (iv) notify the Trustee,
the Exchange Agent and the Underwriter promptly upon the filing of any
prospectus supplement or post-effective amendment and supply as many copies of
the Prospectus as amended or supplemented as shall reasonably be requested to
the Trustee, the Exchange Agent and the Underwriter.  The Underwriter shall be
notified promptly of the need for any such amendment or supplement, and no such
amendment or supplement shall be used or filed without the prior consent of the
Underwriter, which consent shall not be unreasonably withheld.

                 (k)      Notwithstanding the provisions of Subsection 4(j), 
Target may upon notice to the Exchange Agent and the Underwriter (prior
to or following receipt of any notice of exchange of Notes for shares of Common
Stock), suspend for up to 90 consecutive days following such notice Target's
obligation  to supplement or amend the Registration Statement in the event that,
in the opinion of the Board of Directors of Target, such supplement or amendment
would be detrimental to Target insofar as it would require the disclosure of
material, nonpublic information not otherwise then required to be disclosed in
accordance with Target's reporting obligations under the  Exchange Act. Target
may not exercise the foregoing right to suspend its obligation to supplement or
amend the Registration Statement (i) for more than one consecutive 90-day








                                      17.
<PAGE>   18
period during any consecutive 365-day period, (ii) during the period
following any notice by Collagen of its exercise of its option to redeem Notes
in accordance with the  terms of the Indenture and prior to the completion of
such redemption (provided that  Collagen has notified Target at least five days
prior to Collagen's notice of such redemption), (iii) following notice of a
Change in Control of Collagen that permits the holders of Notes to require
redemption of Notes and prior to the date on which such redemption right
terminates, or (iv) on or after April 25, 2002 and so long as any Notes remain
outstanding and exchangeable for shares of Common Stock. In the event of any
such suspension by Target, the Company shall, in accordance with the terms of
the Indenture, pay cash in lieu of delivering Target Common Stock upon any
exchange during the period of such suspension. Target agrees to terminate the
period of suspension prior to the end of the 90-day period by notice to the
Exchange Agent and the Company in the event that the amendment or supplement to
the Registration Statement no longer requires the detrimental disclosure of
material, nonpublic information.

                 (l)      The Company will apply the net proceeds from the sale
of the Notes for the purposes set forth in the Prospectus.

         5.      Costs and Expenses.  The Company will pay all costs, expenses
and fees incident to the performance of the obligations of the Company and
Target under this Agreement, including, without limiting the generality of the
foregoing, the following: accounting fees of the Company and Target; the fees
and disbursements of counsel for the Company and Target; the cost of word
processing, printing and delivering to, or as requested by, the Underwriter
copies of the Registration Statement, Preliminary Prospectuses, the Prospectus,
this Agreement, the Exchange Agreement, the Underwriter Selling Memorandum, and
Blue Sky Memorandum and any supplements or amendments thereto, the fees of the
Trustee and the Exchange Agent and counsel to the Trustee and the Exchange
Agent; the filing fees of the Commission; the filing fees and expenses including
legal fees incident to any required review by the NASD of the terms of the sale
of the Notes, the listing fee of the Nasdaq SmallCap Market,  rating agency
fees and expenses; and the expenses, including the fees and disbursements of
counsel for the Underwriter, incurred in connection with the qualification of
the Notes and the Target Common Stock under state securities or Blue Sky laws
(up to an aggregate of $15,000).  The Company shall not, however, be required to
pay for any of the Underwriter's expenses (other than those related to state
securities or Blue Sky laws) except that, if this Agreement shall not be
consummated because the conditions in section 7 hereof are not satisfied, or
because this Agreement is terminated by the Underwriter pursuant to Section 6
hereof, or by reason of any failure, refusal or inability on the part of the
Company or Target to perform any undertaking or satisfy any condition of this
Agreement or to comply with any of the terms hereof on their part to be
performed, unless such failure to satisfy said condition or to comply with said
terms be due to the default or omission of the Underwriter, then the Company
shall reimburse the Underwriter for out-of-pocket expenses, including fees and
disbursements of counsel, reasonably incurred in connection with investigating,
marketing and proposing to market the Notes or in contemplation of performing
their obligations hereunder; but the Company shall not in any event be liable to
the Underwriter for damages on account of loss of anticipated profits from the
sale by them of the Notes.

         6.      Conditions of Obligations of the Underwriter.  The obligation
of the Underwriter to purchase the Notes on the Closing Date and the Option
Notes, if any, on the Option Closing Date are subject to the accuracy, as of
the Closing Date or the Option Closing Date, as the case





                                      18.
<PAGE>   19
may be, of the representations and warranties of the Company and Target
contained herein, and to the performance by the Company and
Target of each of their covenants and obligations hereunder and to the
following additional conditions:

                 (a)      No stop order suspending the effectiveness of the
Registration Statement, as amended from time to time, shall have been issued
and no proceedings for that purpose shall have been taken or, to the knowledge
of the Company or Target, shall be contemplated by the Commission.

                 (b)      The Underwriter shall have received on the Closing
Date or the Option Closing Date, as the case may be, the opinion of Venture Law
Group, P.C., counsel for the Company and Target, dated the Closing Date or the
Option Closing Date, as the case may be, addressed to the Underwriter to the
effect that:

                          (i)     Each of the Company, Target, the Company
         Subsidiaries and the Target Subsidiaries has been duly incorporated
         and is validly existing as a corporation in good standing under the
         laws of its jurisdiction of incorporation, with full corporate power
         and authority to own or lease its properties and conduct its business
         as described in the Registration Statement.  To such counsel's
         knowledge, except for the Joint Venture, ___________ are the Company's
         only subsidiaries and ____________ are Target's only subsidiaries; 
         and all of the issued and outstanding shares of capital stock of the 
         Company Subsidiaries and Target Subsidiaries have been duly authorized 
         and validly issuable and are fully paid and non-assessable.

                          (ii)    The authorized outstanding capital stock of
         the Company conforms as to legal matters to the description thereof
         set forth in the Prospectus under the caption  "Capitalization of 
         Collagen"; the authorized capital stock of Target conforms as to 
         legal matters to the description thereof set forth in the Prospectus
         under the caption "Description of Target Common Stock"; the outstanding
         shares  of Common Stock of Target, including the Exchange Shares, have
         been duly authorized and validly issued, were issued free from
         prescriptive or similar rights, and are fully paid and non-assessable.
         To such counsel's knowledge  no stockholder of Target has any right
         pursuant to any agreement known to counsel that has not been waived to
         register the sale of any shares owned by such stockholder under the Act
         in the public offering contemplated herein. All necessary corporate
         proceedings have been taken in order to validly authorize the sale of
         the Notes and deposit of the Exchange Shares with the Exchange Agent in
         accordance with the terms thereof, and no further approval or authority
         of the stockholders or the Board of Directors of the Company or Target
         is required for the sale of the Notes as contemplated herein and the
         performance by the Company of the terms of the Indenture.





                                      19.
<PAGE>   20
                          (iii)   The Indenture has been duly authorized,
         executed and delivered by the Company, is a valid and binding
         agreement of the Company enforceable in accordance with its terms and
         has been duly qualified under the Trust Indenture Act (subject to 
         customary exceptions relating to bankruptcy, equity and similar
         matters).

                          (iv)    The Notes have been duly authorized, and when
         executed and authenticated in accordance with the terms of the
         Indenture and delivered to and paid for by the Underwriter in
         accordance with the terms of this Agreement, will be validly issued
         and outstanding, and will constitute valid and binding obligations of
         the Company, enforceable against the Company in accordance with their
         terms and will be entitled to the benefits of the Indenture (subject
         to customary exceptions relating to bankruptcy, equity and similar
         matters).

                          (v)     The Exchange Agreement has been duly
         authorized, executed and delivered by the Company, and is a valid and
         binding agreement of the Company, enforceable in accordance with its
         terms (Subject to customary exceptions relating to bankruptcy, equity
         and similar matters).

                          (vi)    The certificates evidencing the Notes to be
         delivered hereunder are in due and proper form.

                          (vii)   Except as disclosed in the Registration 
         Statement or incorporated therein by reference, to such counsel's 
         knowledge, Target has no outstanding options to purchase, or 
         preemptive rights or other rights to subscribe for or to purchase,
         any securities or obligations convertible into, or any contracts or
         commitments to issue or sell shares of its capital stock or any such
         options, rights, convertible securities or obligations (other than
         options issued under Target's stock option plans). 

                          (viii)  The Registration Statement has become
         effective under the Act and, to the knowledge of such counsel, no stop
         order proceedings with respect thereto have been instituted or are
         pending or threatened under the Act; any required filing of the
         Prospectus and any supplement thereto pursuant to Rule 424(b) of the
         Rules and Regulations has been made in the manner and within the time
         period required by such Rule 424(b).

                          (ix)    The Registration Statement, the Prospectus
         and each amendment or supplement thereto comply as to form in all
         material respects with the requirements of the Act and the Rules and
         Regulations (except that such counsel need express no opinion as to
         the financial statements, schedules and other financial and
         statistical information included therein, information supplied by
         the Underwriter for use therein, information relating to patents,
         trademarks and other intellectual property matters, information 
         relating to regulatory matters or that part of the Registration 
         Statement that constitutes the Form T-1).





                                      20.
<PAGE>   21
                          (x)     The statements under the captions
         Description of the Notes," "Description of Target Common Stock," 
         "Beneficial Ownership of Target Common Stock By Collagen and
         Certain Other Relationships" and "Certain United States Federal Income
         Tax Consequences" in the Prospectus, insofar as such statements
         constitute a summary of documents referred to therein or matters of
         law, in all  material respects accurately present the information
         called for with respect to such documents and matters of law set forth
         therein; provided that such counsel shall not be  required to express
         any opinion as to the determination of the amount of  original issue
         discount attributable to the Notes.

                          (xi)    Such counsel does not know of any contracts
         or documents required to be filed as exhibits to the Registration
         Statement or described in the Registration Statement or the Prospectus
         that are not so filed or described as required.

                          (xii)   To such counsel's knowledge, there is no
         action, suit or proceeding pending or threatened against the Company, 
         Target, any Company Subsidiary or any Target Subsidiary before any 
         court or regulatory, governmental or administrative agency or body
         of a character required to be disclosed in the Prospectus pursuant to
         the Act and the Rules and Regulations that is not disclosed and that
         would not have a material adverse effect on the consolidated financial
         condition  of the Company or Target. To such counsel's knowledge,
         neither the Company, Target, any Company Subsidiary nor any Target
         Subsidiary is a party or subject to provisions of any injunction,
         judgment, decree or order of any court, regulatory body, administrative
         agency or other governmental body or agency that are not so disclosed
         and the effect of which would be material and adverse to the
         consolidated financial condition  of the Company or Target.

                          (xiii)  To such counsel's knowledge, the execution
         and performance of this Agreement and the consummation of the
         transactions herein contemplated do not and will not conflict with or
         result in the breach of, or violation of, any of the terms or
         provisions of, or constitute, either by itself or upon notice or the
         passage of time or both, a default under, any agreement, mortgage, deed
         of trust, lease, franchise, license, indenture, permit or other
         instrument known to such counsel to which the Company, Target, any
         Company Subsidiary or any Target Subsidiary is a party or by which any
         of them or their property may be bound, that have been filed or
         incorporated by reference as exhibits to the Registration Statement,
         except where such breach, violation or default would not have a
         material adverse effect on the consolidated financial condition of the
         Company or Target, or violate any of the provisions of the Certificate
         of Incorporation or bylaws of the Company, Target, any Company
         Subsidiary or any Target Subsidiary or, to such counsel's knowledge,
         violate any U.S. federal or California material statute, judgment,
         decree, order, rule or regulation known to such counsel of any court or
         of any governmental, regulatory or administrative body or agency having
         jurisdiction over the Company, Target, any Company Subsidiary or any
         Target Subsidiary or any of their property (other than as may be
         required by the NASD or as required by state securities or Blue Sky
         Laws as to which such counsel need express no opinion).





                                      21.
<PAGE>   22

                          (xiv)   Each of the Company and Target has the
         corporate power and authority to enter into this Agreement on behalf
         of itself and perform the transactions contemplated hereby.  This
         Agreement has been duly authorized, executed and delivered by each of
         the Company and Target.

                          (xv)    To such counsel's knowledge, each approval,
         consent, order, authorization, designation, registration, permit,
         qualification, license, declaration or filing by or with any
         regulatory, administrative or governmental body necessary in
         connection with the execution and delivery by the Company of this
         Agreement and the consummation of the transactions herein contemplated
         (other than as may be required by the NASD or as required by state
         securities and Blue Sky Laws as to which such counsel need express no
         opinion) has been obtained or made and each is in full force and
         effect except to the extent as would not have a material adverse 
         effect on the Company's consolidated financial condition.

                 As to factual matters, such counsel may rely on certificates
obtained from officers of the Company and Target and from public officials.  
In addition to the matters set forth above, such opinion shall also include 
a statement to the effect that nothing has come to the attention of such
counsel that leads them to believe that the Registration Statement, or any
amendment thereto, at the time the Registration Statement, or any amendment
thereto, at the time the Registration Statement or amendment became effective,
contained an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading or the Prospectus or any amendment or supplement thereto, at the
time it was filed pursuant to Rule 424(b) or at the Closing Date or the Option
Closing Date, as the case may be, contained an untrue statement of a material
fact or omitted to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading (except that such counsel need express no
view as to patents or similar proprietary rights, financial statements, 
schedules and other financial information and statistical data and
information included therein or information supplied by the Underwriter for use
therein).  With respect to such statement, such counsel may state that their
belief is based upon the procedures set forth in their opinion, but is without
independent check and verification. Such counsel may rely upon the  opinion of
other counsel with respect to matters arising under the laws of any
jurisdiction other than California, federal laws of the United States or the 
General Corporation Law of the State of Delaware.

         (c)     The Underwriter shall have received on the Closing Date or the
Option Closing Date, as the case may be, the opinion of Hyman Phelps &
McNamara, special regulatory counsel for the Company and Target, dated the
Closing Date or the Option Closing Date, as the case may be, addressed to the
Underwriter to the effect that:

                 (i)      The statements in the Registration Statement and the
         Prospectus under the captions "Risk Factors--Governmental
         Regulation," "Risk Factors--Third-Party Reimbursement,"
         "Business--Governmental Regulation and Product Testing,"
         "Business--Third-Party Reimbursement" and other statements in the
         Registration Statement and the Prospectus that discuss Food and Drug
         Administration regulatory matters, to the best of such counsel's
         knowledge and belief, are accurate and complete statements or
         summaries of the matters set forth.





                                      22.
<PAGE>   23
         In addition, such counsel shall state that, although they have not
verified the accuracy or completeness of the statements contained in the
Registration Statement or the Prospectus, nothing has come to the attention of
such counsel that caused them to believe that, at the time the Registration
Statement became effective nor on the Closing Date or the Option Closing Date,
as the case may be, the description of the regulatory situation of the Company
and Target and the other statements under the captions "Risk
Factors--Governmental Regulation." "Risk Factors--Third Party Reimbursement,"
"Business--Governmental Regulation and Product Testing" and "Business--Third
Party Reimbursement" in the Registration Statement and Prospectus contained any
untrue statement of a material fact or omitted to state a material fact
required to be stated therein or necessary to make the statements therein no
misleading.

                 (d)      The Underwriter shall have received on the Closing
Date or the Option Closing Date, as the case may be, the opinion of Morrison &
Foerster, special patent counsel for the Company and Target, dated the Closing
Date or the Option Closing Date, as the case may be, addressed to the
Underwriter to the effect that:

                          (i)     The statements in the Registration Statement
         under the captions "Risk Factors--Risk Factors Relating to
         Collagen--Patents and Proprietary Technology," "Risk Factors--Risk
         Factors Relating to Target--Patents and Proprietary Technology,"
         "Business of Collagen--Litigation" and "Business of Target--Patents,
         Trade Secrets and Licenses" and other statements in the Registration
         Statement and Prospectus that discuss patents and proprietary rights,
         to the best of such counsel's knowledge and belief, are accurate and
         complete statements or summaries of the matters therein set forth.

                          (ii)    To the best of such counsel's knowledge, each
         of the Company and Target owns or possesses adequate and sufficient
         rights to use all patents and patent rights necessary for the conduct
         of their respective business, except where the failure to possess the
         same would not have a material adverse effect on the business or
         financial condition of either the Company or Target; such counsel is
         not aware of any pending or threatened action, suit, proceeding or
         claim by others, either domestically or internationally, that the
         Company or Target is violating any patents, patent rights, or rights
         thereto of others, the existence of which could reasonably be expected
         to have a material adverse effect on the business or financial
         condition of either the Company or Target; except as set forth in the
         Prospectus such counsel is not aware of any rights of third parties
         to, or any infringement of, any of the Company's or Target's patents
         or patent rights, the existence of which reasonably could be expected
         to have a material adverse affect on the business or financial
         condition of either the Company or Target; and except as set forth in
         the Prospectus such counsel is not aware of any pending or threatened
         action, suit, proceeding or claim by others challenging the validity
         of scope of any of such patents or patent rights, or rights thereto of
         others, the existence of which could reasonably be expected to have a
         material adverse affect on the business or financial condition of
         either the Company or Target.





                                      23.
<PAGE>   24
         In addition, such counsel shall state that, although they have not
verified the accuracy or completeness of the statements contained in the
Registration Statement or the Prospectus, nothing has come to the attention of
such counsel that caused them to believe that, at the time the Registration
Statement became effective nor on the Closing Date or Option Closing Date, as
the case may be, the description of the patent situation of either the Company
or Target and the statements made under the captions "Risk Factors--Factors
Relating to Collagen--Patents and Proprietary Technology," "Risk Factors--Risk
Factors Relating to Target--Patents and Proprietary Technology," "Business of
Collagen--Litigation," and "Business of Target--Patents, Trade Secrets and
Licensing" contained any untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading.

                 (e)      The Underwriter shall have received from Cooley
Godward Castro Huddleson & Tatum, counsel for the Underwriter, an opinion dated
the Closing Date or the Option Closing Date, as the case may be, substantially
to the effect that: (i) each of the Company and Target is a validly organized
and existing corporation under the laws of the State of Delaware, (ii) the
Notes and the Common Stock conform to the description thereof contained in the
Prospectus; (iii) the Registration Statement has become effective under the Act
and to the best of the knowledge of such counsel, no stop order proceedings
with respect thereto have been instituted or are pending or threatened under
the Act; (iv) the Registration Statement, all Preliminary Prospectuses, the
Prospectus and each amendment or supplement thereto comply as to form in all
material respects with the requirements of the Act and the applicable Rules and
Regulations thereunder (except that such counsel need express no opinion as to
the financial statements, schedules and other financial or statistical
information included therein); and (v) this Agreement has been duly authorized,
executed and delivered by the Company and Target.  In rendering such opinion,
Cooley Godward Castro Huddleson & Tatum may rely as to all matters governed
other than by California, the corporate laws of Delaware or Federal securities
laws on the opinion of counsel referred to in paragraph (b) of this Section 6.
In addition to the matters set forth above, such opinion shall also include a
statement to the effect that nothing has come to the attention of such counsel
that leads them to believe that the Registration Statement, the Prospectus or
any amendment thereto contains an untrue statement of a material fact or omits
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading or the Prospectus or any amendment or
supplement thereto, at the time it was filed pursuant to Rule 424(b) or at the
Closing Date or the Option Closing Date, as the case may be, contained an
untrue statement of a material fact or omitted to state a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading (except
that such counsel need express no view as to patent or similar proprietary
rights, financial statements, schedules and other financial information
included therein).  With respect to such statement, Cooley Godward Castro
Huddleson & Tatum may state that their belief is based upon the procedures set
forth therein, but is without independent check or verification.





                                      24.
<PAGE>   25
                 (f)      The Underwriter shall have received at or prior to
the Closing Date from Cooley Godward Castro Huddleson & Tatum a memorandum or
summary, in form and substance satisfactory to the Underwriter, with respect to
the qualification for offering and sale by the Underwriter of the Notes under
the state securities or Blue Sky laws of such jurisdictions as the Underwriter
may reasonably have designated to the Company.

                 (g)      The Underwriter shall have received on the Closing
Date or  the Option Closing Date, as the case may be, a signed letter from
Ernst & Young LLP, dated the Closing Date or the Option Closing Date, as the
case may be, that shall confirm, on the basis of performing the procedures set
forth in the letter signed by such firm and dated and delivered to the
Underwriter on the date hereof, that nothing has come to their attention during
the period from not more than five business days prior to the date hereof, to a
date not more than five business days prior to the Closing Date or the Option
Closing Date, as the case may be, that would require any change in their letter
dated the date hereof if it were required to be dated and delivered on the
Closing Date or the Option Closing Date, as the case may be.  All such letters
shall be in form and substance satisfactory to the Underwriter.

                 (h)      The Underwriter shall have received on the Closing
Date or the Option Closing Date, as the case may be, a certificate or
certificates of each Chief Executive Officer of each of the Company and Target
to the effect that, as of the Closing Date or the Option Closing Date, as the
case may be, he represents as follows:

                          (i)     The Registration Statement has become
         effective under the Act and, to the best of his knowledge after due
         inquiry, no stop order suspending the effectiveness of the
         Registration Statement has been issued, and no proceedings for such
         purpose have been taken or are contemplated or threatened by the
         Commission.

                          (ii)    To the best of his knowledge after due
         inquiry, no litigation has been instituted or threatened against the
         Company or Target, as applicable, of a character required to be
         disclosed in the Registration Statement that is not so disclosed; to
         the best of his knowledge after due inquiry, there is no contract
         required to be filed as an exhibit to the Registration Statement that
         is not so filed; and the representations and warranties of the Company
         and Target, as applicable, contained in Section 1 hereof are true and
         correct in all material respects as of the Closing Date or the Option
         Closing Date, as the case may be.

                          (iii)   With respect to the Chief Executive Officer
         of the Company, he has carefully examined the Registration Statement
         and the Prospectus and, in his opinion, as of the effective date of
         the Registration Statement, the statements contained in the
         Registration Statement were true and correct, in all material
         respects, and such Registration Statement and Prospectus did not omit
         to state a material fact required to be stated therein or necessary in
         order to make the statements therein not misleading and, in this
         opinion, since the effective date of the Registration Statement, no
         event has





                                      25.
<PAGE>   26
         occurred that should have been set forth in a supplement to or an
         amendment of the Prospectus that has not been so set forth in such
         supplement or amendment; provided, however, that insofar as such
         representations relate to the Target Information, they be made only to
         the best knowledge and belief of the Company's Chief Executive Officer.

                          (iv)    With respect to the Chief Executive Officer
         of Target, he has carefully examined the Registration Statement and
         the Prospectus and, in his opinion, as of the effective date of the
         Registration Statement, the Target Information contained in the
         Registration Statement were true and correct, in all material
         respects, and Target Information such Registration Statement and
         Prospectus did not omit to state a material fact required to be stated
         therein or necessary in order to make the statements therein not
         misleading and, in his opinion, since the effective date of the
         Registration Statement, no event has occurred that should have been
         set forth in a supplement to or an amendment of the Prospectus that
         has not been so set forth in such supplement or amendment.

                 (i)      The Company and Target shall have furnished to the
Underwriter such further certificates and documents confirming the
representations and warranties contained herein and related matters as the
Underwriter may reasonably have requested.

                 (j)      The Company and Target shall have delivered to you,  
on the date hereof, a written agreement from each officer and director of
the Company and Target that provides that such person will not, for 90 days
after the effective date of the Registration Statement, offer to sell, contract
to sell or otherwise sell or dispose of, any shares of Target Common Stock, any
options or warrants to purchase any shares of Target Common Stock, or any
securities convertible into or exchangeable for shares of Target Common Stock
owned directly by such person or with respect to which such person has the power
of disposition, other than (i) as a gift or gifts, provided the donee or donees
thereof agree to be bound by this restriction or (ii) with the prior written
consent of the Underwriter.  Each of the Company's and  Target's officers and
directors, and certain key employees shall be bound by  the foregoing provision
for a period of 90 days after the effective date of the Registration Statement.

                 (k)      The Firm Notes and Option Notes, if any, have been
approved for designation upon notice of issuance on the National Association of
Securities Dealers Nasdaq SmallCap Market.

                 The opinions and certificates described in this Agreement
shall be deemed to be in compliance with the provisions hereof only if they are
in all respects reasonably satisfactory to the Underwriter and to Cooley
Godward Castro Huddleson & Tatum, counsel for the Underwriter.

                 If any of the conditions hereinabove provided for in this
Section 6 shall not have been fulfilled when and as required by this Agreement
to be fulfilled, the obligations of the Underwriter hereunder may be terminated
by the Underwriter by notifying the Company of such





                                      26.
<PAGE>   27
termination in writing or by telegram at or prior to the Closing Date or the
Option Closing Date, as the case may be.  In such
event, the Company, Target and the Underwriter shall not be under any
obligation to each other (except to the extent provided in
Sections 5 and 8 hereof).

         7.      Conditions of the Obligations of the Company.  The obligations
of the Company to sell and deliver the portion of the Notes required to be
delivered as and when specified in this Agreement are subject to the condition
that, at the Closing Date or the Option Closing Date, as the case may be, no
stop order suspending the effectiveness of the Registration Statement shall
have been issued and in effect or proceedings therefor initiated or threatened.

         8.      Indemnification.

        (a)      The Company agrees to indemnify and hold harmless the
Underwriter and each person, if any, who controls the Underwriter, within the
meaning of the Act, against any losses, claims, damages or liabilities to which
the Underwriter or such controlling person may become subject under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions or
proceedings in respect thereof) arise out of or are based upon (i) any breach of
any representation, warranty or covenant of the Company herein contained, (ii)
any untrue statement or alleged untrue statement of any material fact contained
in the Registration Statement, any Preliminary Prospectus, the Prospectus or any
amendment or supplement thereto, or (iii) the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading, and will reimburse the Underwriter and
each such controlling person in connection with investigating or defending any
such loss, claim, damage, liability, action or proceeding; provided, however,
that (i) the Company will not be liable pursuant to the foregoing clauses (ii)
and (iii) to the extent that any such loss, claim, damage or liability is
finally judicially determined to have arisen out of or to be based upon Target
Information, (ii) the Company will not be liable in any such case to the extent
that any such loss, claim, damage or liability arises out of or is based upon an
untrue statement, or alleged untrue statement, or omission or alleged omission
made in the Registration Statement, any Preliminary Prospectus, the Prospectus,
or such amendment or supplement, in reliance upon and in conformity with written
information furnished to the Company or Target by the Underwriter specifically
for use in the preparation thereof (which the parties hereto agree is limited
solely to that information contained on the cover page of the Prospectus or
Preliminary Prospectus or in the section thereof entitled "Underwriting"), and
(iii) such indemnity with respect to any preliminary Prospectus shall not inure
to the benefit of the Underwriter (or any person controlling the Underwriter)
from whom the person asserting any such loss, claim, damage or liability
purchased the Notes or Exchange Property that are the subject thereof if such
person did not receive a copy of the Prospectus (or the Prospectus as amended or
supplemented) at or prior to the confirmation of the sale of such Notes or
Exchange Property to such person in any case where such delivery is required by
the Act and the untrue statement or omission of a material fact contained in
such preliminary prospectus was corrected in the Prospectus (or the Prospectus
as amended or supplemented).  This indemnity agreement will be in addition to
any liability which the Company and Target may otherwise have.





                                      27.
<PAGE>   28

                 (b)      Target agrees to indemnify and hold harmless the
Underwriter and each person, if any, who controls the Underwriter, 
within the meaning of the Act, against any losses, claims, damages or
liabilities to which the Underwriter or such controlling person may become
subject under the Act or otherwise insofar as such losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) arise out of or are
based upon (i) any breach of any representation, warranty or covenant of Target
herein contained, (ii) any untrue statement or alleged untrue statement of any
material fact contained in the Registration Statement, any Preliminary
Prospectus, the Prospectus or any amendment or supplement thereto, or (iii) the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
will reimburse the Underwriter and each such controlling person in connection
with investigating or defending any such loss, claim, damage, liability, action
or proceeding; provided, however, that (A) Target will be liable pursuant to
the foregoing clauses (ii) and (iii) only to the extent that any such loss,
claim, damage or liability arises out of or is based upon the Target
Information and (B) without limiting (A), Target will not be liable in any such
case to the extent any such loss, claim, damage or liability arises out of or
is based upon an untrue statement, or alleged untrue statement, or omission or
alleged omission made in the Registration Statement, any Preliminary
Prospectus, the Prospectus, or such amendment or supplement, in reliance upon
and in conformity with written information furnished to the Company or Target
by the Underwriter specifically for use in the preparation thereof (which the
parties hereto agree is limited solely to that information contained on the
cover page of the Prospectus or Preliminary Prospectus or in the section
thereof entitled "Underwriting"), and (iii) such indemnity with respect to any
preliminary Prospectus shall not inure to the benefit of the Underwriter (or
any person controlling the Underwriter) from whom the person asserting any such
loss, claim, damage or liability purchased the Notes or Exchange Property that
are the subject thereof if such person did not receive a copy of the Prospectus
(or the Prospectus as amended or supplemented) at or prior to the confirmation
of the sale of such Notes or Exchange Property to such person in any case where
such delivery is required by the Act and the untrue statement or omission of a
material fact contained in such preliminary prospectus was corrected in the
Prospectus (or the Prospectus as amended or supplemented).  This indemnity
agreement will be in addition to any liability that Target may otherwise have.

                 (c)      The Underwriter will indemnify and hold harmless the
Company and Target, each of their respective directors, each of their
respective officers who have signed the Registration Statement, and each
person, if any, who controls the Company or Target, within the meaning of the
Act, against any losses, claims, damages or liabilities to which the Company,
Target or any such director, officer, or controlling person may become subject,
under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) arise out of or are
based upon any untrue statement or alleged untrue statement of any material
fact contained in the Registration Statement, any Preliminary Prospectus, the
Prospectus, or any amendment or supplement thereto, or arise out of or are
based upon the omission or the alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading in the light of the circumstances under which they were made;
and will reimburse any legal or other expenses reasonably incurred by





                                      28.
<PAGE>   29
the Company, Target or any such director, officer, or controlling person in
connection with investigating or defending any such loss, claim, damage, 
liability, action or proceeding; provided, however, that each Underwriter 
will be liable in each case to the extent, but only to the extent, that 
such untrue statement or alleged untrue statement or omission or alleged 
omission has been made in the Registration Statement, any Preliminary 
Prospectus, the Prospectus, or such amendment or supplement, in reliance 
upon and in conformity with written information furnished to the Company 
or Target by the Underwriter specifically for use in the preparation
thereof (which the parties hereto agree is limited solely to that information
contained on the cover page of the Prospectus or Preliminary Prospectus or 
in the section thereof entitled "Underwriting"). This indemnity agreement 
will be in addition to any liability that such Underwriter may otherwise have.

                 (d)     (i) The Company agrees to indemnify and hold harmless
Target, each of its directors, each of its officers who have signed the
Registration Statement, and each person, if any, who controls Target, within
the meaning of the Act, against any losses, claims, damages or liabilities,
insofar as such losses, claims, damages or liabilities (or actions or
proceedings in respect thereof) arise out of or are based upon (i) any breach
of any representation, warranty or covenant of the Company herein contained,
(ii) any untrue statement or alleged untrue statement of any material fact
contained in the Registration Statement, any Preliminary Prospectus, the
prospectus or any amendment or supplement thereto, or (iii) the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
Target, and each such director, offer or controlling person in connection with
investigating or defending any such loss, claim, damage, liability, action or
proceeding; provided, however, that (i) the Company will not be liable pursuant
to the foregoing clauses (ii) and (iii) to the extent that any such loss,
claim, damage or liability arises out of or is based upon Target Information,
and (ii) the Company will not be liable to Target in any such case to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement, or alleged untrue statement, or omission or alleged
omission made in the Registration Statement, any Preliminary Prospectus, the
Prospectus, or such amendment or supplement, in reliance upon and in conformity
with written information furnished to the Company or Target by the Underwriter
specifically for use in the preparation thereof. This indemnity agreement will
be in addition to any liability which the Company may otherwise have to Target.

                 (ii)   Target agrees to indemnify and hold harmless the
Company, each of its directors, each of its officers who have signed the
Registration Statement, and each person, if any, who controls the Company,
within the meaning of the Act, against any losses, claims, damages or
liabilities, insofar as such losses, claims, damages or liabilities (or actions
or proceedings in respect thereof) arise out of or are based upon (i) any
breach of any representation, warranty or covenant of Target herein contained,
(ii) any untrue statement or alleged untrue statement of any material fact
contained in the Registration Statement, any Preliminary Prospectus, the
prospectus or any amendment or supplement thereto, or (iii) the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
the Company, and each such director, offer or controlling person in connection
with investigating or defending any such loss, claim, damages, liability,
action or proceeding; provided, however, that Target will not be liable
pursuant to the foregoing clauses (ii) and (iii) to the extent that any such
loss, claim, damage or liability arises out of or is based upon any information
other than the Target Information. This indemnity agreement will be in addition
to any liability which Target may otherwise have to the Company.

                 (iii)  Nothing in this subsection (d) is intended to affect in
any way the obligations of Collagen or Target, on the one hand, to the
Underwriter, on the other hand.


                 (e)      In case any proceeding (including any governmental
investigation) shall be instituted involving any person in respect of
which indemnity may be sought pursuant to this Section 8, such person (the
"indemnified party") shall promptly notify the person against whom such
indemnity may be sought (the "indemnifying party") in writing.  No
indemnification provided for in Section 8(a), (b), (c) or (d) shall be available
to any party who shall fail to give notice as provided in this Section 8(e) if
the party to whom notice was not given was unaware of the proceeding to which
such notice would have related and was prejudiced by the failure to give such
notice, but the failure to give such notice shall not relieve the indemnifying
party or parties from any liability that it or they may have to the indemnified
party for contribution or otherwise than on account of the provisions of Section
8(a), (b), (c) or (d).  In case any such proceeding shall be brought against any
indemnified party and it shall notify the indemnifying party of the commencement
thereof, the indemnifying party shall be entitled to participate therein and, to
the extent that it shall wish, jointly with any other indemnifying party
similarly notified, to assume the defense thereof, with counsel reasonably
satisfactory to such indemnified party and shall pay as incurred the fees and
disbursements of such counsel related to such proceeding.  In any such
proceeding, any indemnified party shall have the right to retain its own counsel
at its own expense.  Notwithstanding the foregoing, the indemnifying party shall
pay as incurred the fees and expenses of the counsel retained by the indemnified
party in the event (i) the indemnifying party and the indemnified party shall
have mutually agreed to the retention of such counsel or (ii) the named parties
to any such proceeding (including any impleaded parties) include both the
indemnifying party and the indemnified party and representation of both parties
by the same counsel would be in appropriate due to actual or potential differing
interests between them.  It is understood that the indemnifying party shall not,
in connection with any proceeding or related proceedings in the same
jurisdiction, be liable for the reasonable fees and expenses of more than one
separate firm for all such indemnified parties.  Such firm shall be designated
in writing by you in the case of parties indemnified pursuant to Sections 8(a)
and 8(b) and by the Company and Target in the case of parties indemnified
pursuant to Section 8(c) and 8(d).  The indemnifying party shall not be liable
for any settlement of any proceeding effected without its written consent but if
settled with such consent or if there be a final judgment for the plaintiff, the
indemnifying party agrees to indemnify the indemnified party from and against
any loss or liability by reason of such settlement or judgment.





                                      29.
<PAGE>   30

                 (f)      If the indemnification provided for in this Section 8
is unavailable to or insufficient to hold harmless an indemnified party under 
Section 8(a), (b), (c) or (d) above in respect of any losses, claims, damages
or liabilities (or actions or proceedings in respect thereof) referred to
therein, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of such losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) in such proportion as
is appropriate to reflect the relative benefits received by the Company and
Target on the one hand and the Underwriter on the other from the offering of the
Notes and the Common Stock; and, as between the Company and Target, the relative
benefits received by each from the offering of the Notes and the Common  Stock. 
If, however, the allocation provided by the immediately preceding sentence is
not permitted by applicable law or if the indemnified party failed to give the
notice required under Section 8(e) above, then each indemnifying party shall
contribute to such amount paid or payable by such indemnified party in such
proportion as is appropriate to reflect not only such relative benefits but also
the relative fault of the Company and Target on the one hand and the Underwriter
on the other (or, as between the Company and Target, to reflect not only such
relative benefits but also the relative fault of the Company and Target) in
connection with the statements or omissions that resulted in such losses,
claims, damages or liabilities (or actions or proceedings in respect thereof),
as well as any other relevant equitable considerations.  The relative benefits
received by the Company and Target on the one hand and the Underwriter on the
other shall be deemed to be in the same proportion as the total net proceeds
from the offering (before deducting expenses) received by the Company and Target
bear to the total underwriting fees and commissions received by the Underwriter,
in each case as set forth in the table on the cover page of the Prospectus.  The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company or Target on the one hand or the Underwriter on the other and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission.

                 The Company, Target and the Underwriter agree that it would
not be just and equitable if contributions pursuant to this Section 8(e) were
determined by pro rata allocation (even if the Underwriter were treated as one
entity for such purpose) or by any other method of allocation that does not
take account of the equitable considerations referred to above in this Section
8(f).  The amount paid or payable by an indemnified party as a result of the
losses, claims, damages or liabilities (or actions or proceedings in respect
thereof) referred to above in this Section 8(f) shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim.
Notwithstanding the provisions of this subsection 8(f), (i) the Underwriter
shall not be required to contribute any amount in excess of the underwriting
discounts and commissions applicable to the Notes, and (ii) no person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

                 (g)      In any proceeding relating to the Registration
Statement, any Preliminary Prospectus, the Prospectus or any supplement or
amendment thereto, each party against whom contribution may be sought under
this Section 8 hereby consents to the jurisdiction of any court





                                      30.
<PAGE>   31
having jurisdiction over any other contributing party, and agrees that process
issuing from such court may be served upon him or it by any other contributing
party and consents to the service of such process and agrees that any other 
contributing party may join him or it as an additional defendant in any such 
proceeding in which such other contributing party is a party.

         9.      Notices.  All communications hereunder shall be in writing and,
except as otherwise provided herein, will be mailed, delivered or telegraphed
and confirmed as follows:  if the Underwriter, to Alex. Brown & Sons
Incorporated, 135 East Baltimore Street, Baltimore, Maryland 21202, Attention:
Syndicate Department; if to the Company, to Collagen Corporation, 2500 Faber
Place, Palo Alto, California, Attention:  Chairman, or to Target Therapeutics,
Inc., 47201 Lakeview Boulevard, Fremont, California 94538, Attention:  
President with a copy to Venture Law Group, a professional corporation 2800 
Sand Hill Road, Menlo Park, California 94025, Attention: Michael W. Hall, Esq.

         10.     Termination.  This Agreement may be terminated by you by
notice to the Company as follows:

                 (a)      at any time prior to the earlier of (i) the time the
Notes are released by you for sale by notice to the Underwriter, or (ii) 11:30
A.M., Baltimore time, on the first business day following the date of this
Agreement;

                 (b)      at any time prior to the Closing Date if any of the
following has occurred:  (i) since the respective dates as of which information
is given in the Registration Statement and the Prospectus, any material adverse
change or any development involving a prospective material adverse change in or
affecting the condition, financial or otherwise, of the Company or Target, or
the earnings, business affairs, management, or business prospects of the
Company or Target, whether or not arising in the ordinary course of business,
(ii) any outbreak or escalation of hostilities or declaration of war or
national emergency after the date hereof or other national or international
calamity or crisis or change in economic or political conditions if the effect
of such outbreak, escalation, declaration, emergency, calamity, crisis or
change on the financial markets of the United States would, in your reasonable
judgment, make the offering or delivery of the Notes impracticable or
inadvisable, (iii) any suspension of trading in securities on the New York
Stock Exchange, Inc. or the American Stock Exchange or limitation on prices
(other than limitations on hours or numbers of days of trading) for securities
on either such Exchange, (iv) the enactment, publication, decree or other
promulgation of any federal or state statute, regulation, rule or order of any
court or other governmental authority that, in your reasonable opinion,
materially and adversely affects or will materially or adversely affect the
business or operations of the Company or Target, taken individually or as a
whole, (v) any declaration of a banking moratorium by either federal or New
York State authorities or (vi) the taking of any action by any federal, state
or local government or agency in respect of its monetary or fiscal affairs
that, in your reasonable opinion, has a material adverse effect on the
securities markets in the United States; or

                 (c)      as provided in Section 6 of this Agreement.





                                      31.
<PAGE>   32
         This Agreement also may be terminated by you, by notice to the Company
and Target, as to any obligation of the Underwriter to purchase the Option
Shares, upon the occurrence at any time prior to the Option Closing Date of any
of the events described in subparagraph (b) above or as provided in Section 6
of this Agreement.

         11.     Successors.  This Agreement has been and is made solely for
the benefit of the Underwriter, the Company and Target and their respective
successors, executors, administrators, heirs and assigns, and the officers,
directors and controlling persons referred to herein, and no other person will
have any right or obligation hereunder.  The term "successors" shall not
include any purchaser of the Notes merely because of such purchase.

         12.     Miscellaneous.  The reimbursement, indemnification and
contribution agreements contained in this Agreement and the representations,
warranties and covenants in this Agreement shall remain in full force and effect
regardless of (a) any termination of this Agreement, (b) any investigation made
by or on behalf of the Underwriter or controlling person thereof, or by or on
behalf of the Company or Target or their respective directors or officers and
(c) delivery of and payment for the Notes under this Agreement.

         This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

         THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH,
THE LAWS OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO CONFLICT OF LAWS
PRINCIPLES.





                                      32.
<PAGE>   33
         If the foregoing agreement is in accordance with your understanding of
our agreement, please sign and return to us the enclosed duplicates thereof,
whereupon it will become a binding agreement among the Company, Target and the
Underwriter in accordance with its terms.

                                        Very truly yours,

                                        COLLAGEN CORPORATION


                                        By ____________________________________
                                           Name:  Howard D. Palefsky
                                           Title: Chairman of the Board &
                                                  Chief Executive Officer

                                        TARGET THERAPEUTICS, INC


                                        By ____________________________________
                                           Name:  Gary R. Bang
                                           Title: President & Chief Executive
                                                  Officer

The foregoing Underwriting Agreement
is hereby confirmed and accepted as
of the date first above written.

ALEX. BROWN & SONS INCORPORATED


By ______________________________
   Name:
   Title:





                                      33.

<PAGE>   1
 
                                                                    EXHIBIT 12.1
 
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                            OF COLLAGEN CORPORATION
 
<TABLE>
<CAPTION>
                                                                                         SIX MONTHS ENDED
                                         YEARS ENDED JUNE 30,                              DECEMBER 31,
                      -----------------------------------------------------------      --------------------
                       1990         1991         1992         1993         1994         1993          1994
                      -------      -------      -------      -------      -------      ------        ------
<S>                   <C>          <C>          <C>          <C>          <C>          <C>           <C>
Consolidated pre-tax
  income from
  continuing
  operations........  $11,620      $ 8,737      $ 3,903      $18,312      $ 8,848      $4,037        $6,283
Adjustment related
  to net equity
  income (loss) of
  less than 50%
  owned
  affiliates........       --           --           32         (968)         269          37           369
Add back fixed
  charges...........    1,707        2,231        2,420        1,557        1,547         758           883
                      -------      -------      -------      -------      -------      ------        ------
                      $13,327      $10,968      $ 6,355      $18,901      $10,664      $4,832        $7,535
                      ========     ========     =======      ========     ========     ======        ======
Fixed charges:
  Interest expense..  $   983      $ 1,000      $   796      $    --      $    --      $   --        $   55
  Interest portion
     of rent
     expense........      724        1,231        1,624        1,557        1,547         758           828
                      -------      -------      -------      -------      -------      ------        ------
  Total.............  $ 1,707      $ 2,231      $ 2,420      $ 1,557      $ 1,547      $  758        $  883
                      ========     ========     =======      ========     ========     ======        ======
Ratio of earnings to
  fixed charges.....      7.8x         4.9x         2.6x        12.1x         6.9x        6.4x          8.5x
                      ========     ========     =======      ========     ========     ======        ======
</TABLE>


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