MEDTRONIC INC
S-4/A, 1998-09-24
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 24, 1998
    
   
                                                      REGISTRATION NO: 333-62305
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------
 
   
                         PRE-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-4
    
 
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933
                           --------------------------
 
                                MEDTRONIC, INC.
 
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                 <C>                                 <C>
            MINNESOTA                              3845                             41-0793183
 (State or other jurisdiction of       (Primary Standard Industrial      (I.R.S. Employer Identification
  incorporation or organization)       Classification Code Number)                   Number)
</TABLE>
 
                            7000 CENTRAL AVENUE N.E.
                          MINNEAPOLIS, MINNESOTA 55432
                                 (612) 514-4000
 
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                           --------------------------
 
                               CAROL E. MALKINSON
                  SENIOR LEGAL COUNSEL AND ASSISTANT SECRETARY
                                MEDTRONIC, INC.
                            7000 CENTRAL AVENUE N.E.
                          MINNEAPOLIS, MINNESOTA 55432
                                 (612) 514-4000
 
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                           --------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                         <C>
          DAVID C. GRORUD, ESQ.                      BRUCE A. MACHMEIER, ESQ.
           MARY E. STRAND, ESQ.                      TIMOTHY J. SCALLEN, ESQ.
         FREDRIKSON & BYRON, P.A.                OPPENHEIMER WOLFF & DONNELLY LLP
   900 SECOND AVENUE SOUTH, SUITE 1100         45 SOUTH SEVENTH STREET, SUITE 3400
    MINNEAPOLIS, MINNESOTA 55402-3397           MINNEAPOLIS, MINNESOTA 55402-1609
              (612) 347-7000                              (612) 607-7000
</TABLE>
 
                           --------------------------
 
   APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
                                    PUBLIC:
 UPON CONSUMMATION OF THE MERGER, AS DESCRIBED IN THIS REGISTRATION STATEMENT.
                           --------------------------
 
    If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. / /
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
                           --------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
                                                                   PROPOSED MAXIMUM    PROPOSED MAXIMUM       AMOUNT OF
  TITLE OF EACH CLASS OF SECURITIES TO BE        AMOUNT TO BE     OFFERING PRICE PER  AGGREGATE OFFERING     REGISTRATION
                 REGISTERED                     REGISTERED(1)           SHARE               PRICE             FEE(2)(3)
<S>                                           <C>                 <C>                 <C>                 <C>
Common Stock, par value $.10 per share(4)...   1,638,387 shares     Not Applicable      Not Applicable        $24,268.36
</TABLE>
    
 
   
(1) Represents the approximate maximum number of shares issuable upon
    consummation of the Merger as described in the Registration Statement, based
    upon the anticipated maximum number of outstanding shares of AVECOR
    Cardiovascular Inc. Common Stock immediately prior to the Merger's Effective
    Time that are not owned by Medtronic, Inc. (8,100,000) and assuming the
    Average Stock Price for Medtronic, Inc. Common Stock is equal to $55.00,
    thereby resulting in the maximum Conversion Fraction of 0.20227 of a
    Medtronic, Inc. share issued for each AVECOR Cardiovascular Inc. share.
    
 
   
(2) The registration fee was calculated pursuant to Section 6 of the Securities
    Act of 1933 (the "Securities Act") and Rules 457(f)(1) and 457(c)
    thereunder, as 0.000295 multiplied by the product of (A) 8,100,000, the
    anticipated maximum number of AVECOR Cardiovascular Inc. shares that may be
    exchanged pursuant to the Merger, multiplied by (B) $10.15625, the average
    of the high and low sale prices of AVECOR Cardiovascular Inc. Common Stock
    as reported by the Nasdaq National Market on August 21, 1998, which date was
    within five business days prior to the date of the original filing of the
    Registration Statement on August 26, 1998.
    
 
   
(3) The entire registration fee was paid at the time of original filing of the
    Registration Statement on August 26, 1998.
    
 
   
(4) Each share of Medtronic, Inc. Common Stock includes a Preferred Stock
    Purchase Right pursuant to Medtronic, Inc.'s Shareholder Rights Plan.
    
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT 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 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON
SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A), MAY
DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
   
                                     [LOGO]
 
                                                              September 28, 1998
    
 
Dear AVECOR Shareholder:
 
   
    I am pleased to invite you to attend the Special Meeting of Shareholders of
AVECOR Cardiovascular Inc. ("AVECOR"), which will be held on October 28, 1998,
at 9:00 a.m., local time, at AVECOR's corporate headquarters, located at 7611
Northland Drive, Minneapolis, Minnesota. At the meeting you will be asked to
consider and vote upon a Plan of Merger and an Agreement and Plan of Merger
dated as of July 12, 1998 (the "Merger Agreement") that provide for the merger
of a wholly-owned subsidiary of Medtronic, Inc. ("Medtronic") into AVECOR.
    
 
    Under the terms of the Plan of Merger and the Merger Agreement, AVECOR
shareholders will receive $11.125 in shares of Medtronic Common Stock in
exchange for each of their shares of AVECOR Common Stock. The actual number of
Medtronic shares you will receive in the merger for your AVECOR shares will be
based on the market value of Medtronic Common Stock for a specified time period
before the meeting.
 
    The attached Proxy Statement/Prospectus is intended to provide you with the
information you will need to make an informed decision regarding how your should
vote on the proposed merger. It also serves as a Prospectus for Medtronic,
describing the investment in Medtronic that you will be making if the merger is
approved and you exchange your AVECOR Common Stock for Medtronic Common Stock.
Copies of the Plan of Merger and the Merger Agreement are attached to the Proxy
Statement/Prospectus as Appendices A and B. I urge you to read this information
carefully before voting on the proposed merger.
 
    THE BOARD OF DIRECTORS BELIEVES THE PROPOSED TRANSACTION IS FAIR AND IN THE
BEST INTERESTS OF AVECOR AND ITS SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS
APPROVAL OF THE PLAN OF MERGER AND THE MERGER AGREEMENT. The Board believes that
the merger will, among other things, permit AVECOR shareholders to continue
their equity participation on a tax-free basis in a larger, more diversified
medical products enterprise.
 
    The Board of Directors of AVECOR retained the investment banking firm of
Piper Jaffray Inc. to advise it with respect to the consideration to be received
in the merger. Piper Jaffray has advised the Board that, in its opinion, the
consideration to be received by AVECOR shareholders pursuant to the Merger
Agreement and the Plan of Merger is fair to such shareholders from a financial
point of view. A copy of the opinion is attached to the Proxy
Statement/Prospectus as Appendix D.
 
    The Plan of Merger and the Merger Agreement must be approved by the holders
of a majority of the outstanding shares of AVECOR Common Stock. Your vote on
this matter is very important. We urge you to carefully review the enclosed
material and to return your proxy promptly.
 
    WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING, PLEASE SIGN AND PROMPTLY
RETURN YOUR PROXY CARD IN THE ENCLOSED POSTAGE-PAID ENVELOPE. IF YOU ATTEND THE
MEETING, YOU MAY VOTE IN PERSON IF YOU WISH, EVEN THOUGH YOU HAVE PREVIOUSLY
RETURNED YOUR PROXY.
 
                                          Sincerely,
 
                                                      [SIGNATURE]
 
                                          Anthony Badolato
                                          CHAIRMAN AND CHIEF EXECUTIVE OFFICER
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
                              7611 NORTHLAND DRIVE
                          MINNEAPOLIS, MINNESOTA 55428
 
                            ------------------------
 
   
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                          TO BE HELD OCTOBER 28, 1998
    
 
                            ------------------------
 
TO THE SHAREHOLDERS OF
AVECOR CARDIOVASCULAR INC.:
 
   
    A Special Meeting of the Shareholders of AVECOR Cardiovascular Inc.
("AVECOR") will be held at AVECOR's corporate headquarters, located at 7611
Northland Drive, Minneapolis, Minnesota, on October 28, 1998, at 9:00 a.m.,
local time, to consider and act upon a proposal to approve a Plan of Merger and
an Agreement and Plan of Merger (the "Merger Agreement"), copies of which are
included as Appendices A and B to the Proxy Statement/Prospectus accompanying
this Notice. Pursuant to the Plan of Merger and the Merger Agreement, (a) AC
Merger Corp. ("Merger Subsidiary") will be merged into AVECOR, with AVECOR to be
the surviving corporation and to become a wholly-owned subsidiary of Medtronic,
Inc. ("Medtronic"), and (b) holders of AVECOR common stock, par value $.01 per
share ("AVECOR Common Stock"), will receive shares of Medtronic common stock,
par value $.10 per share ("Medtronic Common Stock"), based upon a conversion
fraction described in the Proxy Statement/ Prospectus accompanying this Notice.
    
 
    With respect to the proposal to approve the Plan of Merger and the Merger
Agreement, AVECOR shareholders have a right to dissent and obtain payment in
cash for their shares by complying with the terms and procedures of Sections
302A.471 and 302A.473 of the Minnesota Business Corporation Act, copies of which
are included as Appendix C to the Proxy Statement/Prospectus accompanying this
Notice.
 
   
    Only shareholders of record as shown on the books of AVECOR at the close of
business on September 23, 1998 are entitled to notice of and to vote at the
Special Meeting or any adjournments thereof.
    
 
    Information relating to the above proposal is set forth in the attached
Proxy Statement/Prospectus. Approval of the Plan of Merger and the Merger
Agreement will require the affirmative vote of the holders of a majority of the
shares of AVECOR Common Stock outstanding on the record date. All shareholders
are cordially invited to attend the Special Meeting in person.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                                        [SIG]
 
                                          Richard G. Lareau
                                          SECRETARY
 
   
September 28, 1998
    
 
         WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, PLEASE
          COMPLETE, SIGN, AND DATE THE ENCLOSED PROXY CARD AND MAIL IT
         PROMPTLY IN THE ENCLOSED PROXY RETURN ENVELOPE, WHICH REQUIRES
                   NO POSTAGE IF MAILED IN THE UNITED STATES
 
             DO NOT SEND ANY STOCK CERTIFICATES WITH THE PROXY CARD
<PAGE>
                           PROXY STATEMENT/PROSPECTUS
 
<TABLE>
<S>                          <C>
AVECOR Cardiovascular Inc.         Medtronic, Inc.
   7611 Northland Drive       7000 Central Avenue N.E.
  Minneapolis, Minnesota       Minneapolis, Minnesota
           55428                        55432
 Telephone: (612) 391-9000    Telephone: (612) 514-4000
</TABLE>
 
                            ------------------------
 
   
         SPECIAL MEETING OF SHAREHOLDERS OF AVECOR CARDIOVASCULAR INC.
                         TO BE HELD ON OCTOBER 28, 1998
    
 
                             ---------------------
 
   
    This Proxy Statement/Prospectus is being furnished to the shareholders of
AVECOR Cardiovascular Inc. ("AVECOR") in connection with the special meeting of
shareholders (the "Meeting") of AVECOR to be held at AVECOR's corporate
headquarters, located at 7611 Northland Drive, Minneapolis, Minnesota, on
October 28, 1998, at 9:00 a.m. At the Meeting, AVECOR shareholders will be asked
to consider and act upon a proposal to approve the Plan of Merger attached
hereto as Appendix A and the Agreement and Plan of Merger attached hereto as
Appendix B (the "Merger Agreement"), pursuant to which (a) AC Merger Corp.
("Merger Subsidiary"), a wholly-owned subsidiary of Medtronic, Inc.
("Medtronic"), will be merged (the "Merger") into AVECOR, which will be the
surviving corporation in the Merger and become a wholly-owned subsidiary of
Medtronic, and (b) each share of AVECOR common stock, par value $.01 per share
("AVECOR Common Stock"), will be converted into a portion of a share of
Medtronic common stock, par value $.10 per share ("Medtronic Common Stock"), as
described in this Proxy Statement/Prospectus.
    
 
   
    This Proxy Statement/Prospectus also constitutes the Prospectus of Medtronic
with respect to the shares of Medtronic Common Stock to be issued in the Merger.
Medtronic has filed a Registration Statement on Form S-4 with the Securities and
Exchange Commission (the "Commission") covering the shares of Medtronic Common
Stock that may be issued in connection with the Merger, based on the Conversion
Fraction described in this Proxy Statement/Prospectus. The Medtronic Common
Stock is listed on the New York Stock Exchange ("NYSE") under the symbol "MDT."
This Proxy Statement/Prospectus is first being mailed to AVECOR shareholders on
or about September 28, 1998.
    
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.
 
    Information contained or incorporated by reference in this Proxy
Statement/Prospectus regarding Medtronic has been supplied by Medtronic.
Information contained or incorporated by reference in this Proxy
Statement/Prospectus regarding AVECOR has been supplied by AVECOR.
 
    Additional copies of this Proxy Statement/Prospectus and the Proxy card to
be returned for the Meeting can be obtained from AVECOR, 7611 Northland Drive,
Minneapolis, Minnesota 55428, Attention: Investor Relations, telephone (612)
391-9000.
 
   
       THE DATE OF THIS PROXY STATEMENT/PROSPECTUS IS SEPTEMBER 24, 1998.
    
<PAGE>
    No person has been authorized to give any information or to make any
representations other than those contained in this Proxy Statement/Prospectus or
the documents incorporated by reference herein, and any information or
representations not contained herein or therein may not be relied upon as having
been authorized. This Proxy Statement/Prospectus does not constitute an offer to
sell or a solicitation of an offer to buy the Medtronic Common Stock offered by
this Proxy Statement/Prospectus, or the solicitation of a proxy, in any
circumstances in which such offer or solicitation is unlawful. The delivery of
this Proxy Statement/Prospectus does not imply that the information herein is
correct as of any time subsequent to the date of such information.
 
                             AVAILABLE INFORMATION
 
    This Proxy Statement/Prospectus is a prospectus of Medtronic delivered in
compliance with the Securities Act of 1933 (the "Securities Act"). This Proxy
Statement/Prospectus constitutes part of a Registration Statement on Form S-4
(the "Registration Statement") filed by Medtronic with the Commission under the
Securities Act with respect to the Medtronic Common Stock to be issued in
connection with the Merger. This Proxy Statement/Prospectus does not contain all
of the information set forth in the Registration Statement and the exhibits and
schedules thereto. For further information with respect to Medtronic, AVECOR,
and the Medtronic Common Stock offered hereby, reference is made to the
Registration Statement, exhibits, and schedules. Statements contained in this
Proxy Statement/Prospectus as to the contents of any contract or any other
document referred to are not necessarily complete, and in each instance
reference is made to the copy of such contract or document filed as an exhibit
to the Registration Statement or such other document, each such statement being
qualified in all respects by such reference.
 
   
    Medtronic and AVECOR are subject to the informational requirements of the
Securities Exchange Act of 1934 (the "Exchange Act"), and, in accordance
therewith, each files reports, proxy and information statements, and other
information with the Commission. The public may read and copy the Registration
Statement and the reports, proxy and information statements, and other
information filed by each of Medtronic and AVECOR pursuant to the Exchange Act
at the Commission's Public Reference Room at 450 Fifth Street, N.W., Washington,
D.C. 20549, or at one of the Commission's regional offices: 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661-2511 and 7 World Trade Center, 13th
Floor, New York, New York 10048. Copies of all or any part of such material are
available for inspection at the offices of the New York Stock Exchange, Inc., 20
Broad Street, New York, New York 10005. Copies of all or any part of such AVECOR
material are available for inspection at the offices of the National Association
of Securities Dealers, Inc. The public may obtain information on the operation
of the Commission's Public Reference Room by calling the Commission at
1-800-SEC-0330. The Commission maintains an Internet site at
"http://www.sec.gov" containing reports, proxy and information statements, and
other information regarding issuers that file electronically with the
Commission, including Medtronic and AVECOR.
    
 
                     INFORMATION INCORPORATED BY REFERENCE
 
   
    THIS PROXY STATEMENT/PROSPECTUS INCORPORATES CERTAIN DOCUMENTS BY REFERENCE.
MEDTRONIC AND AVECOR WILL PROVIDE WITHOUT CHARGE TO EACH PERSON, INCLUDING ANY
BENEFICIAL OWNER OF AVECOR COMMON STOCK, TO WHOM A COPY OF THIS PROXY
STATEMENT/PROSPECTUS IS DELIVERED, ON WRITTEN OR ORAL REQUEST, COPIES OF ANY AND
ALL SUCH DOCUMENTS (OTHER THAN THE EXHIBITS THERETO, UNLESS SUCH EXHIBITS ARE
SPECIFICALLY INCORPORATED BY REFERENCE INTO THE INFORMATION THAT THIS PROXY
STATEMENT/PROSPECTUS INCORPORATES) OF MEDTRONIC OR AVECOR, AS THE CASE MAY BE,
THAT ARE INCORPORATED BY REFERENCE. REQUESTS SHOULD BE DIRECTED TO MEDTRONIC,
INC., 7000 CENTRAL AVENUE N.E., MINNEAPOLIS, MINNESOTA 55432, ATTENTION:
INVESTOR RELATIONS DEPARTMENT, TELEPHONE (612) 514-3035, OR TO AVECOR
CARDIOVASCULAR INC., 7611 NORTHLAND DRIVE, MINNEAPOLIS, MINNESOTA 55428,
ATTENTION: INVESTOR RELATIONS, TELEPHONE (612) 391-9000. IN ORDER TO ENSURE
TIMELY DELIVERY OF THE DOCUMENTS, ANY SUCH REQUEST SHOULD BE MADE NO LATER THAN
OCTOBER 21, 1998.
    
 
                                       2
<PAGE>
    The following Medtronic documents are incorporated by reference herein:
 
    1.  Medtronic's Annual Report on Form 10-K for the fiscal year ended April
       30, 1998.
 
   
    2.  Medtronic's Quarterly Report on Form 10-Q for the quarter ended July 31,
       1998.
    
 
   
    3.  Medtronic's Current Reports on Form 8-K filed July 8, 1998, July 16,
       1998, August 20, 1998, September 22, 1998, and September 23, 1998.
    
 
   
    4.  The description of Medtronic's Common Stock contained in Medtronic's
       Registration Statement on Form 8-A filed under Section 12 of the Exchange
       Act.
    
 
   
    5.  The description of Medtronic's Preferred Stock Purchase Rights attached
       to its Common Stock contained in Medtronic's Registration Statement on
       Form 8-A filed under Section 12 of the Exchange Act.
    
 
    All documents filed by Medtronic with the Commission pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act after the date hereof and prior
to the date of the Meeting shall be deemed to be incorporated by reference
herein and shall be a part hereof from the date of filing of such documents.
 
    The following AVECOR documents are incorporated by reference herein:
 
    1.  AVECOR's Annual Report on Form 10-K for the year ended December 31,
       1997.
 
    2.  AVECOR's Quarterly Reports on Form 10-Q for the quarters ended March 31,
       1998 and June 30, 1998.
 
    All documents filed by AVECOR with the Commission pursuant to Sections 13(a)
and 15(d) of the Exchange Act after the date hereof and prior to the date of the
Meeting shall be deemed to be incorporated by reference herein and shall be a
part hereof from the date of filing of such documents.
 
    Any statements contained in a document incorporated by reference herein
shall be deemed to be modified or superseded for purposes hereof to the extent
that a statement contained herein (or in any other subsequently filed document
that also is incorporated by reference herein) modifies or supersedes such
statement. Any statement so modified or superseded shall not be deemed to
constitute a part hereof except as so modified or superseded.
 
          CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING INFORMATION
 
    Certain statements contained in this Proxy Statement/Prospectus (including
information included or incorporated by reference herein) and other written and
oral statements made from time to time by Medtronic and AVECOR do not relate
strictly to historical or current facts. As such, they are considered
"forward-looking statements" which provide current expectations or forecasts of
future events. Such statements can be identified by the use of terminology such
as "anticipate," "believe," "estimate," "expect," "intend," "may," "could,"
"possible," "plan," "project," "will," "forecast" and similar words or
expressions. Medtronic's and AVECOR's respective forward-looking statements
generally relate to their respective growth strategies, financial results,
product development and regulatory approval programs, and sales efforts. One
must carefully consider forward-looking statements and understand that such
statements involve a variety of risks and uncertainties, known and unknown, and
may be affected by inaccurate assumptions. Consequently, no forward-looking
statement can be guaranteed and actual results may vary materially. It is not
possible to foresee or identify all factors affecting Medtronic's or AVECOR's
respective forward-looking statements, and investors therefore should not
consider any list of factors affecting Medtronic's or AVECOR's respective
forward-looking statements to be an exhaustive statement of all risks,
uncertainties, or potentially inaccurate assumptions. Neither Medtronic nor
AVECOR undertakes any obligation to update any forward-looking statement.
 
                                       3
<PAGE>
    Although it is not possible to create a comprehensive list of all factors
that may cause actual results to differ from Medtronic's or AVECOR's
forward-looking statements, such factors include, among others, (i) trends
toward managed care, health care cost containment, and other changes in
government and private sector initiatives, in the United States and other
countries in which Medtronic or AVECOR do business, that are placing increased
emphasis on the delivery of more cost-effective medical therapies; (ii) the
trend of consolidation in the medical device industry as well as among customers
of medical device manufacturers, resulting in more significant, complex, and
long-term contracts than in the past and potentially greater pricing pressures;
(iii) the difficulties and uncertainties associated with the lengthy and costly
new product development and regulatory approval processes, which may result in
lost market opportunities or preclude product commercialization; (iv) efficacy
or safety concerns with respect to marketed products, whether scientifically
justified or not, that may lead to product recalls, withdrawals, or declining
sales; (v) changes in governmental laws, regulations, and accounting standards
and the enforcement thereof that may be adverse to Medtronic or AVECOR; (vi)
increased public interest in recent years in product liability claims for
implanted medical devices, including pacemakers and leads; (vii) other legal
factors including environmental concerns and patent or other intellectual
property disputes with competitors or others; (viii) agency or government
actions or investigations affecting the industry in general or Medtronic or
AVECOR in particular; (ix) the development of new products or technologies by
competitors, technological obsolescence, and other changes in competitive
factors; (x) risks associated with maintaining and expanding international
operations; (xi) business acquisitions, dispositions, discontinuations or
restructurings by Medtronic or AVECOR; (xii) the integration of businesses
acquired by Medtronic or AVECOR; and (xiii) economic factors over which
Medtronic or AVECOR has no control, including changes in inflation, foreign
currency rates, and interest rates. Medtronic and AVECOR note these factors as
permitted by the Private Securities Litigation Reform Act of 1995.
 
                                       4
<PAGE>
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
SUMMARY....................................................................................................          7
 
GENERAL INFORMATION........................................................................................         18
 
THE MERGER.................................................................................................         19
  General..................................................................................................         19
  Effective Time of the Merger.............................................................................         19
  Background of the Merger.................................................................................         20
  AVECOR's Reasons for the Merger; Recommendation of the AVECOR Board of Directors.........................         23
  Medtronic's Reasons for the Merger.......................................................................         24
  Opinion of AVECOR's Financial Advisor....................................................................         24
  Vote Required............................................................................................         28
  Conversion of AVECOR Common Stock in the Merger..........................................................         29
  Shareholder Rights Plans.................................................................................         30
  Treatment of Stock Options...............................................................................         31
  Conduct of Business of AVECOR Pending the Merger.........................................................         31
  Interests of Certain Persons in the Merger...............................................................         32
  Voting Agreements........................................................................................         33
  Stock Option Agreement...................................................................................         33
  Conditions; Waiver.......................................................................................         33
  Amendment and Termination of the Merger Agreement........................................................         34
  Expenses and Fees........................................................................................         35
  Restrictions on Resale of Medtronic Common Stock.........................................................         35
  Deregistration of AVECOR Common Stock....................................................................         36
  Accounting Treatment of the Merger.......................................................................         36
  Certain Federal Income Tax Consequences..................................................................         36
  Indemnification..........................................................................................         38
  Regulatory Requirements..................................................................................         38
  Rights of Dissenting AVECOR Shareholders.................................................................         38
 
COMPARATIVE STOCK PRICES AND DIVIDENDS.....................................................................         41
 
RECENT DEVELOPMENTS........................................................................................         42
 
COMPARATIVE RIGHTS OF MEDTRONIC AND AVECOR SHAREHOLDERS....................................................         43
  Classification, Removal, and Nomination of Directors.....................................................         43
  Preferred Stock..........................................................................................         44
  Special Meetings of Shareholders.........................................................................         45
  Voting Rights; Shareholder Approvals.....................................................................         45
  Cumulative Voting........................................................................................         45
  Preemptive Rights........................................................................................         45
  Amendment of the Articles of Incorporation...............................................................         45
  Business Combinations and Control Share Acquisitions.....................................................         45
  Shareholder Rights Plans.................................................................................         46
  Related Person Business Transactions.....................................................................         47
 
INFORMATION REGARDING AVECOR...............................................................................         48
  General Development of Business..........................................................................         48
  Industry Background and Markets..........................................................................         48
  Products.................................................................................................         52
  Research and Development.................................................................................         55
</TABLE>
    
 
                                       5
<PAGE>
   
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Marketing................................................................................................         56
  Competition..............................................................................................         57
  Manufacturing............................................................................................         58
  Governmental Regulation..................................................................................         59
  Third-Party Reimbursement and Cost Containment...........................................................         61
  Patents and Propriety Rights.............................................................................         62
  Employees................................................................................................         64
 
SELECTED FINANCIAL DATA OF AVECOR..........................................................................         65
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF AVECOR............         66
 
CERTAIN TRANSACTIONS AND RELATIONSHIPS BETWEEN AVECOR AND MEDTRONIC........................................         74
 
LEGAL MATTERS..............................................................................................         74
 
EXPERTS....................................................................................................         74
 
INDEX TO FINANCIAL STATEMENTS..............................................................................        F-1
 
APPENDIX A--Plan of Merger.................................................................................        A-1
 
APPENDIX B--Agreement and Plan of Merger...................................................................        B-1
 
APPENDIX C--Sections 302A.471 and 302A.473 of Minnesota Business Corporation Act...........................        C-1
 
APPENDIX D--Opinion of Piper Jaffray Inc...................................................................        D-1
</TABLE>
    
 
                                       6
<PAGE>
                                    SUMMARY
 
    THE FOLLOWING IS A BRIEF SUMMARY OF CERTAIN INFORMATION CONTAINED ELSEWHERE
IN THIS PROXY STATEMENT/ PROSPECTUS AND IN THE DOCUMENTS INCORPORATED HEREIN BY
REFERENCE. CERTAIN CAPITALIZED TERMS USED IN THIS SUMMARY ARE DEFINED ELSEWHERE
IN THIS PROXY STATEMENT/PROSPECTUS. REFERENCE IS MADE TO, AND THIS SUMMARY IS
QUALIFIED IN ITS ENTIRETY BY, THE MORE DETAILED INFORMATION CONTAINED IN THIS
PROXY STATEMENT/PROSPECTUS, THE APPENDICES HERETO, AND THE DOCUMENTS
INCORPORATED IN THIS PROXY STATEMENT/PROSPECTUS BY REFERENCE.
 
                             PARTIES TO THE MERGER
 
   
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AVECOR:.................  AVECOR Cardiovascular Inc. ("AVECOR"), a Minnesota corporation,
                          was incorporated in 1990 and began operations in 1991 when it
                          purchased the surgical division of SCIMED Life Systems, Inc.
                          AVECOR designs, manufactures, markets, and services specialty
                          medical devices for heart/lung bypass surgery and long-term
                          respiratory support. Its products include the
                          AFFINITY-Registered Trademark- microporous, hollow fiber membrane
                          oxygenator and related blood reservoirs, a line of solid silicone
                          membrane oxygenators and related blood reservoirs, the AFFINITY
                          blood pump, the MYOTHERM-Registered Trademark- cardioplegia
                          delivery system, SIGNATURE-TM- custom tubing packs, and the
                          AFFINITY arterial filter.
 
                          AVECOR's principal offices and corporate headquarters are located
                          at 7611 Northland Drive, Minneapolis, Minnesota 55428, telephone:
                          (612) 391-9000. See "Information Incorporated by Reference" and
                          "Information Regarding AVECOR."
 
MEDTRONIC:..............  Medtronic, Inc. ("Medtronic"), a Minnesota corporation, was
                          incorporated in 1957. Medtronic is the world's leading medical
                          technology company specializing in implantable and interventional
                          therapies. Its primary products include those for bradycardia
                          pacing, tachyarrhythmia management, atrial fibrillation
                          management, heart failure management, coronary and peripheral
                          vascular disease, heart valve replacement, extracorporeal cardiac
                          support, minimally invasive cardiac surgery, malignant and
                          non-malignant pain, movement disorders, neurosurgery and
                          neurodegenerative disorders. Medtronic serves customers and
                          patients in more than 120 countries.
 
                          Medtronic's principal offices and corporate headquarters are
                          located at 7000 Central Avenue N.E., Minneapolis, Minnesota
                          55432, telephone: (612) 514-4000. See "Information Incorporated
                          by Reference."
 
AC MERGER CORP.:........  AC Merger Corp. ("Merger Subsidiary"), a Minnesota corporation,
                          is a corporation recently organized by Medtronic for the purpose
                          of effecting the Merger. It has no material assets and has not
                          engaged in any activities except in connection with the proposed
                          Merger.
 
                               AVECOR SHAREHOLDERS' MEETING
 
TIME, DATE, AND PLACE OF
  MEETING:..............  A special meeting of shareholders of AVECOR will be held on
                          October 28, 1998, at 9:00 a.m., local time, at AVECOR's corporate
                          headquarters, located at 7611 Northland Drive, Minneapolis,
                          Minnesota (the "Meeting").
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                                       7
<PAGE>
 
   
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PURPOSE OF THE
  MEETING:..............  The purpose of the Meeting is to consider and vote upon a
                          proposal to approve the Plan of Merger attached hereto as
                          Appendix A and the Agreement and Plan of Merger dated as of July
                          12, 1998 (the "Merger Agreement"), among Medtronic, AVECOR, and
                          Merger Subsidiary, which is attached hereto as Appendix B,
                          providing for the merger (the "Merger") of Merger Subsidiary into
                          AVECOR, as a result of which AVECOR will become a wholly-owned
                          subsidiary of Medtronic. Other terms and provisions related to
                          the Merger are set forth in the Merger Agreement, which is
                          summarized in this Proxy Statement/Prospectus.
 
RECORD DATE:............  Only holders of record of AVECOR Common Stock at the close of
                          business on September 23, 1998, will be entitled to receive
                          notice of and to vote at the Meeting or any adjournment or
                          adjournments thereof.
 
VOTE REQUIRED:..........  The affirmative vote by the holders of a majority of the
                          outstanding shares of AVECOR Common Stock is required to approve
                          the Plan of Merger and the Merger Agreement. As of the record
                          date, 8,055,975 shares of AVECOR Common Stock were outstanding
                          and entitled to vote. Of such shares, 1,084,524 shares
                          (approximately 13.5% of the shares entitled to vote at the
                          Meeting) are beneficially owned by directors and executive
                          officers of AVECOR. AVECOR's directors and executive officers
                          have executed voting agreements under which such persons agreed
                          to vote shares of AVECOR Common Stock owned by them in favor of
                          the Merger. Of the shares of AVECOR Common Stock outstanding as
                          of the record date, Medtronic, through a wholly-owned subsidiary,
                          owns 346,960 shares of AVECOR Common Stock representing
                          approximately 4.3% of the shares entitled to vote. Medtronic
                          intends to have all such shares voted in favor of the Merger.
 
                          AVECOR shareholders have the power to revoke proxies previously
                          given by them before the shares represented by any such proxies
                          are voted at the Meeting. See "General Information."
 
                          Approval of the Plan of Merger and the Merger Agreement by
                          Medtronic shareholders is not required under Minnesota law and,
                          accordingly, will not be sought. See "The Merger--Vote Required."
 
DISSENTERS' RIGHTS:.....  Under Minnesota law, holders of AVECOR Common Stock who give
                          proper notice to AVECOR and who do not vote in favor of the
                          Merger have the right to receive in cash the "fair value" of
                          their AVECOR shares in lieu of Medtronic Common Stock as a result
                          of the Merger. See "The Merger--Rights of Dissenting AVECOR
                          Shareholders" and Sections 302A.471 and 302A.473 of the Minnesota
                          Business Corporation Act (the "MBCA"), copies of which are
                          attached hereto as Appendix C. Holders of Medtronic Common Stock
                          do not have dissenters' rights in connection with the Merger.
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                                       8
<PAGE>
 
   
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                                 DESCRIPTION OF THE MERGER
 
GENERAL:................  Upon consummation of the Merger, Merger Subsidiary will be merged
                          into AVECOR and AVECOR will become a wholly-owned subsidiary of
                          Medtronic. Each share of AVECOR Common Stock outstanding
                          immediately prior to the Merger (except shares of AVECOR Common
                          Stock owned by Medtronic and any shares as to which dissenters'
                          rights have been properly exercised) will be converted into the
                          portion of a share (the "Conversion Fraction") of Medtronic
                          Common Stock equal to $11.125 divided by the average of the daily
                          closing sale prices of Medtronic Common Stock as reported on the
                          NYSE Composite Tape (the "Average Stock Price") for the 18
                          consecutive NYSE trading days ending on the second NYSE trading
                          day immediately preceding the Effective Time of the Merger.
                          Solely for illustrative purposes, the Conversion Fraction would
                          be .1980 (or one Medtronic share for each 5.05 AVECOR shares
                          held) if the Average Stock Price were calculated based upon the
                          closing sale price of Medtronic Common Stock on September 21,
                          1998.
 
                          The Conversion Fraction is subject to appropriate adjustment in
                          the event of a stock split, combination, stock dividend, or other
                          distribution of shares of Medtronic Common Stock prior to the
                          Effective Time of the Merger. See "The Merger."
 
                          Each share of Medtronic Common Stock received in the Merger will
                          also represent one Preferred Stock Purchase Right under
                          Medtronic's Shareholder Rights Plan. See "The Merger--Shareholder
                          Rights Plans."
 
                          Persons entitled to a fractional share of Medtronic Common Stock
                          upon such conversion will receive a cash payment in lieu thereof.
                          See "The Merger--Conversion of AVECOR Common Stock in the
                          Merger-- Fractional Shares."
 
                          If the Merger is approved and the Merger is completed, AVECOR
                          shareholders will be instructed to deliver to Medtronic's
                          exchange agent for the Merger a letter of transmittal, which will
                          be sent to such shareholders following the Merger, together with
                          certificates evidencing each shareholder's AVECOR Common Stock,
                          in exchange for the Medtronic Common Stock and, if applicable,
                          cash in lieu of any fractional shares of Medtronic Common Stock.
                          AVECOR SHAREHOLDERS SHOULD NOT SEND IN THEIR CERTIFICATES UNTIL
                          THEY RECEIVE A LETTER OF TRANSMITTAL. See "The Merger--
                          Conversion of AVECOR Common Stock in the Merger."
 
EFFECTIVE TIME OF THE
  MERGER:...............  It is expected that the Merger will become effective as promptly
                          as practicable following approval of the Plan of Merger and the
                          Merger Agreement by the requisite vote of the AVECOR shareholders
                          and the satisfaction or waiver of the other conditions to the
                          Merger. See "The Merger--Effective Time" and "--Conditions;
                          Waiver."
 
BACKGROUND OF THE
  MERGER:...............  The terms of the Merger Agreement are the result of arm's-length
                          negotiations between representatives of Medtronic and AVECOR. The
                          following is a brief discussion of the background of these
                          negotiations, the Merger, and related transactions.
 
                          In November 1997, AVECOR engaged Piper Jaffray Inc. ("Piper
                          Jaffray") to explore various strategic alternatives for AVECOR.
</TABLE>
    
 
                                       9
<PAGE>
 
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                          During the period from December 1997 to early July 1998, AVECOR
                          met at various times with Medtronic and four other companies
                          regarding a possible business combination between AVECOR and each
                          of those companies. During the course of AVECOR's negotiations
                          with Medtronic, which began in June 1998, AVECOR continued to
                          discuss a possible transaction with two of the other four
                          interested companies.
 
                          During June 1998, Medtronic held meetings with AVECOR, reviewed
                          due diligence information concerning AVECOR's business, and
                          ultimately proposed the terms of its offer to acquire AVECOR. On
                          June 25, 1998, the Medtronic Board of Directors approved the
                          acquisition of AVECOR, subject to final negotiations by senior
                          management. During the period of July 7-12, 1998, AVECOR,
                          Medtronic, and their respective advisors negotiated the
                          definitive terms of the Merger Agreement and related agreements.
 
                          On July 12, 1998, the Board of Directors of AVECOR unanimously
                          approved the terms of the Merger Agreement and the Plan of
                          Merger. The Merger Agreement was signed following the conclusion
                          of the meeting of the Board of Directors of AVECOR. See "The
                          Merger--Background of the Merger," "--AVECOR's Reasons for the
                          Merger; Recommendation of the AVECOR Board of Directors,"
                          "--Medtronic's Reasons for the Merger," and "--Opinion of
                          AVECOR's Financial Advisor."
 
REASONS FOR THE
  MERGER:...............  In reaching its conclusions to approve the Merger Agreement and
                          to recommend the approval of the Plan of Merger and the Merger
                          Agreement by the AVECOR shareholders, the AVECOR Board of
                          Directors considered various factors, including: (i) AVECOR's
                          strategic alternatives, including remaining a separate company,
                          exploring a future acquisition of AVECOR by another party, or
                          engaging in a merger of equals or joint venture transaction with
                          another party; (ii) certain factors influencing the heart/lung
                          bypass device industry, including pricing pressures, the need to
                          compete by offering a more complete line of products, and other
                          competitive factors; (iii) the overall strategic fit between
                          AVECOR and Medtronic in view of their respective product lines,
                          markets, and distribution channels and the potential synergies,
                          efficiencies, and cost savings that could be realized through a
                          combination of AVECOR and Medtronic; (iv) the opportunity for
                          AVECOR shareholders to continue equity participation in a larger,
                          more diversified medical device company at a premium over market
                          prices for AVECOR Common Stock prior to announcement of the
                          Merger; (v) the financial advice provided to AVECOR by Piper
                          Jaffray and Piper Jaffray's opinion that the consideration to be
                          received by AVECOR shareholders in the Merger is fair from a
                          financial point of view; (vi) the terms and conditions of the
                          Merger Agreement; and (vii) that the Merger will be a tax-free
                          transaction for federal income tax purposes to AVECOR
                          shareholders receiving Medtronic Common Stock.
 
                          THE BOARD OF DIRECTORS OF AVECOR HAS UNANIMOUSLY APPROVED THE
                          MERGER, AND THE BOARD RECOMMENDS THAT THE SHAREHOLDERS OF AVECOR
                          VOTE IN FAVOR OF THE PLAN OF MERGER AND THE MERGER AGREEMENT.
</TABLE>
 
                                       10
<PAGE>
 
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                          See "The Merger--AVECOR's Reasons for the Merger; Recommendation
                          of the AVECOR Board of Directors," "--Medtronic's Reasons for the
                          Merger," "--Opinion of AVECOR's Financial Advisor," and
                          "Comparative Stock Prices and Dividends." For information on the
                          interests of certain persons in the Merger, see "The
                          Merger--Interests of Certain Persons in the Merger."
 
AVECOR'S FINANCIAL
  ADVISOR:..............  Piper Jaffray was retained by AVECOR to advise it with respect to
                          the fairness of the consideration to be received by AVECOR
                          shareholders in the Merger from a financial point of view. Piper
                          Jaffray has rendered its written opinion to the effect that, as
                          of the date of such opinion, the consideration to be received in
                          the Merger by AVECOR shareholders is fair to the AVECOR
                          shareholders from a financial point of view. The full text of the
                          opinion of Piper Jaffray, which contains information as to the
                          assumptions made, matters considered, and the scope and
                          limitations on the review undertaken, is set forth as Appendix D
                          to this Proxy Statement/ Prospectus and should be read in its
                          entirety. See "The Merger--Opinion of AVECOR's Financial
                          Advisor."
 
FLUCTUATION IN MARKET
  PRICE:................  Although the Merger Agreement fixes the value of Medtronic Common
                          Stock to be issued with respect to each share of AVECOR Common
                          Stock at $11.125, the number of shares of Medtronic Common Stock
                          to be received by AVECOR shareholders in the Merger will depend
                          on the market value of Medtronic Common Stock, which is subject
                          to fluctuation. Because of such fluctuations in the value of
                          Medtronic shares, the market value of Medtronic Common Stock that
                          AVECOR shareholders receive in the Merger may increase or
                          decrease following the Merger. See "Comparative Stock Prices and
                          Dividends" and "The Merger--Conversion of AVECOR Common Stock in
                          the Merger."
 
CERTAIN FEDERAL INCOME
  TAX CONSEQUENCES:.....  The Merger is expected to be treated as a tax-free reorganization
                          within the meaning of Sections 368(a)(1)(A) and 368(a)(2)(E) of
                          the Internal Revenue Code of 1986, as amended (the "Code").
                          Medtronic, AVECOR, and Merger Subsidiary will each be a "party to
                          the reorganization" within the meaning of Section 368(b) of the
                          Code.
 
                          No gain or loss will be recognized by the shareholders of AVECOR
                          upon their receipt of Medtronic Common Stock in exchange for
                          their AVECOR Common Stock. An AVECOR shareholder receiving cash
                          in lieu of a fractional share or exercising dissenters' rights,
                          however, will be required to recognize gain, if any, realized in
                          the transaction but not in excess of the cash received by such
                          shareholder. See "The Merger--Certain Federal Income Tax
                          Consequences."
 
ACCOUNTING TREATMENT:...  Medtronic intends to account for the Merger as a purchase for
                          accounting and financial reporting purposes under generally
                          accepted accounting principles. See "The Merger--Accounting
                          Treatment of the Merger."
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                                       11
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TREATMENT OF STOCK
  OPTIONS:..............  Pursuant to the terms of the outstanding options to purchase
                          AVECOR Common Stock, such options that are not otherwise vested
                          will be fully vested and exercisable as a result of the Merger.
                          All options that are not exercised and remain outstanding at the
                          Effective Time will be assumed by Medtronic and will thereafter
                          be exercisable on the same terms and conditions, except for
                          appropriate adjustments to reflect the Conversion Fraction and
                          conversion into options to purchase Medtronic Common Stock. See
                          "The Merger--Treatment of Stock Options" and "--Interests of
                          Certain Persons in the Merger."
 
INTERESTS OF CERTAIN
  PERSONS IN THE
  MERGER:...............  In considering the recommendation of the Board of Directors of
                          AVECOR with respect to the Plan of Merger, the Merger Agreement,
                          and the transactions contemplated thereby, shareholders of AVECOR
                          should be aware that certain executive officers and directors of
                          AVECOR have certain interests in the Merger that are in addition
                          to, and may conflict with, the interests of shareholders of
                          AVECOR generally. These interests include, among other things,
                          the interests of certain executives and directors of AVECOR in
                          stock options that will vest and become exercisable as a result
                          of the Merger, and the obligation of Medtronic to cause AVECOR to
                          continue to provide certain indemnification and related insurance
                          coverage to directors, officers, employees, and agents of AVECOR
                          following the Merger.
 
                          Two executive officers of AVECOR have executed separate
                          noncompetition agreements with Medtronic and, pursuant to the
                          terms of the Merger Agreement, AVECOR is required to use all
                          reasonable efforts to cause two other executive officers and one
                          other member of AVECOR's management to execute proposed
                          noncompetition agreements with Medtronic. All executed and
                          proposed agreements are conditioned upon the effectiveness of the
                          Merger and provide that the individual, upon signing the
                          agreement, agrees that such individual will not be employed by,
                          associated with, or render services to certain competitive
                          businesses, anywhere in the world, for 24 or 42 months (depending
                          on the individual) after the Merger. In addition, four executive
                          officers are parties to change in control agreements with AVECOR
                          that provide certain payments and other benefits to these
                          individuals if, during the 12-month period following a "change in
                          control" of AVECOR or its successors (such as the Merger), (i)
                          such individual's employment is terminated other than for death,
                          disability, or "for cause" or (ii) such individual terminates his
                          employment as a result of a material adverse change in the nature
                          of such individual's employment.
 
                          The AVECOR Board of Directors was aware of each of these
                          interests and considered them, among other matters, in approving
                          the Merger. See "The Merger--Interests of Certain Persons in the
                          Merger."
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                                       12
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REGULATORY APPROVAL:....  The only federal or state regulatory approval needed to effect
                          the Merger is the expiration or termination of all applicable
                          waiting periods under the Hart-Scott-Rodino Antitrust
                          Improvements Act of 1976 (the "HSR Act"). On August 21, 1998,
                          Medtronic and AVECOR received a request for additional
                          information relating to the notifications that they had earlier
                          filed under the HSR Act. This request extends the waiting period
                          during which the applicable governmental authorities can review
                          the Merger. The waiting period will expire on the 20th day after
                          the companies substantially comply with the request. The
                          companies have discussed and clarified the request with the
                          governmental authorities and expect to file shortly their
                          response to the request. Medtronic and AVECOR do not expect
                          international regulatory filings that may be required, if any, to
                          affect the expected timing of the Merger. See "The
                          Merger--Regulatory Requirements."
 
NO SOLICITATION:........  Pursuant to the Merger Agreement, AVECOR and its representatives
                          cannot, prior to the Effective Time or earlier termination of the
                          Merger Agreement, encourage, solicit, discuss, or negotiate with
                          any person (other than Medtronic) concerning any merger, sale, or
                          license of any significant portion of AVECOR's assets or similar
                          transaction, except to the extent required by the fiduciary
                          obligations of the AVECOR Board of Directors and in accordance
                          with the provisions of the Merger Agreement. See "The
                          Merger--Conduct of Business of AVECOR Pending the Merger."
 
CONDITIONS TO MERGER:...  The respective obligations of Medtronic, Merger Subsidiary, and
                          AVECOR to effect the Merger are subject to the satisfaction or
                          waiver at or prior to the Merger of certain conditions. See "The
                          Merger--Conditions; Waiver."
 
TERMINATION:............  The Merger Agreement may be terminated prior to the Effective
                          Time, whether before or after approval of the Merger by the
                          AVECOR shareholders, in certain specified events. Upon a
                          termination as a result of certain of such events, AVECOR is
                          required to pay to Medtronic a termination fee of $2.75 million.
                          See "The Merger--Amendment and Termination of the Merger
                          Agreement."
 
STOCK OPTION
  AGREEMENT:............  In connection with the execution of the Merger Agreement,
                          Medtronic and AVECOR entered into a Stock Option Agreement
                          pursuant to which AVECOR granted to Medtronic an option to
                          purchase up to 1,600,851 shares of AVECOR Common Stock (or 19.9%
                          of the outstanding shares of AVECOR Common Stock as of July 12,
                          1998) at an exercise price of $11.125 per share. The option is
                          exercisable upon the occurrence of certain events and provides
                          Medtronic with the right, under certain circumstances, to require
                          AVECOR to repurchase the option for its in-the-money value,
                          provided that the sum of any termination fee and the amount paid
                          to repurchase the option cannot exceed $3.6 million. The option,
                          which Medtronic required as a condition to Medtronic's entering
                          into the Merger Agreement, may increase the likelihood of
                          consummation of the Merger. See "The Merger--Stock Option
                          Agreement" and "--Amendment and Termination of the Merger
                          Agreement."
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                                       13
<PAGE>
     COMPARISON OF RIGHTS OF MEDTRONIC SHAREHOLDERS AND AVECOR SHAREHOLDERS
 
    Medtronic and AVECOR are incorporated under the laws of the State of
Minnesota. The rights of AVECOR shareholders are currently governed by the
Second Restated Articles of Incorporation, as amended, and Bylaws, as amended,
of AVECOR. Upon consummation of the Merger, AVECOR shareholders will become
shareholders of Medtronic and their rights as such will be governed by the
Restated Articles of Incorporation and Bylaws, as amended, of Medtronic. See
"The Merger-- Comparative Rights of Medtronic Shareholders and AVECOR
Shareholders."
 
               RECENT PRICES OF MEDTRONIC AND AVECOR COMMON STOCK
 
   
    On July 10, 1998, the last trading day preceding public announcement of the
Merger Agreement, the reported closing sale price of Medtronic Common Stock on
the NYSE was $69.8125 per share. On that day, the reported closing sale price of
AVECOR Common Stock on the Nasdaq National Market was $9.875 per share. On
September 21, 1998, the latest practicable trading day prior to the printing of
this Proxy Statement/Prospectus, the reported closing sale price of Medtronic
Common Stock on the NYSE was $56.1875 per share. On that day, the reported
closing sale price of AVECOR Common Stock on the Nasdaq National Market was
$9.50 per share.
    
 
   
    Pursuant to the Merger Agreement, the actual portion of a Medtronic share
into which one AVECOR share will be converted will be equal to $11.125 divided
by the Average Stock Price of Medtronic Common Stock for the 18 consecutive NYSE
trading days ending on the second trading day immediately preceding the
Effective Time of the Merger. Solely for illustrative purposes, the Conversion
Fraction would be 0.1594 if the Average Stock Price were calculated based on the
reported closing sale price of Medtronic Common Stock on July 10, 1998, or .1980
if the Average Stock Price were calculated based on the reported closing sale
price of Medtronic Common Stock on September 21, 1998. See "Comparative Stock
Prices and Dividends" and "The Merger--Conversion of AVECOR Common Stock in the
Merger."
    
 
                              RECENT DEVELOPMENTS
 
   
    To be eligible to use the pooling of interests accounting method to account
for its merger with Physio-Control International Corporation ("Physio-Control")
and future transactions, Medtronic has recently completed an offering, at a
price per share of $56.75, of 12.5 million shares of Medtronic Common Stock,
which approximates the number of shares tainted for purposes of the pooling of
interests accounting method.
    
 
    On June 27, 1998, Medtronic entered into an agreement to acquire
Physio-Control, a company that designs, manufactures, markets, and services an
integrated line of noninvasive emergency cardiac defibrillator and vital sign
assessment devices, disposable electrodes, and data management software.
Pursuant to the acquisition agreement, Physio-Control will become a wholly-owned
subsidiary of Medtronic in a stock-for-stock merger that is expected to be
tax-free and accounted for using the pooling of interests accounting method.
 
   
    On September 22, 1998, Medtronic entered into an agreement to acquire Midas
Rex, L.P. ("Midas Rex"), a privately-held company that designs, manufactures,
markets, distributes, and sells high-speed neurological powered instruments,
including pneumatic instrumentation for surgical dissection of bones, biometals,
bioceramics, and bioplastics, and related instruments. Pursuant to the
acquisition agreement, Medtronic or a subsidiary of Medtronic will acquire for
cash all of the assets and certain liabilities of Midas Rex.
    
 
                                       14
<PAGE>
                       SELECTED HISTORICAL FINANCIAL DATA
 
   
    The following table sets forth selected historical financial data for
Medtronic as of and for each of the five consecutive fiscal years ended April
30, 1998 and as of and for the three-month periods ended July 31, 1998 and
August 1, 1997, and for AVECOR as of and for each of the five consecutive fiscal
years ended December 31, 1997 and as of and for the six-month periods ended June
30, 1998 and 1997. Such data should be read in conjunction with the consolidated
financial statements and the unaudited condensed consolidated interim financial
statements of Medtronic and AVECOR, all of which are incorporated by reference
or included herein. The consolidated interim financial data of Medtronic as of
and for the three-month periods ended July 31, 1998 and August 1, 1997 and of
AVECOR as of and for the six-month periods ended June 30, 1998 and 1997 included
herein has been prepared, without audit, by Medtronic and AVECOR, respectively.
Selected unaudited financial data for Medtronic as of and for the three months
ended July 31, 1998 and August 1, 1997 and for AVECOR as of and for the
six-month periods ended June 30, 1998 and 1997 include all adjustments
(consisting only of normal recurring adjustments) that each considers necessary
for a fair presentation of the consolidated operating results and financial
position as of and for such interim periods. Results of operations for the
interim periods are not necessarily indicative of results for the full years.
See "Information Incorporated by Reference," "Selected Financial Data of
AVECOR," and "Index to Financial Statements."
    
 
                                MEDTRONIC, INC.
                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                            THREE MONTHS ENDED
                                                                 YEAR ENDED APRIL 30,                     ----------------------
                                              ----------------------------------------------------------  AUGUST 1,    JULY 31,
                                                 1994        1995        1996        1997      1998(2)       1997        1998
                                              ----------  ----------  ----------  ----------  ----------  ----------  ----------
                                                                                                               (UNAUDITED)
<S>                                           <C>         <C>         <C>         <C>         <C>         <C>         <C>
Net sales...................................  $1,390,922  $1,742,392  $2,172,100  $2,438,224  $2,604,819  $  646,279  $  653,235
Net earnings................................     232,357     294,000     428,306     529,988     457,382     146,488     150,356
Basic earnings per share(1).................        0.51        0.64        0.90        1.11        0.98        0.31        0.32
Diluted earnings per share(1)...............        0.50        0.63        0.89        1.09        0.96        0.31        0.32
Total assets................................   1,623,252   1,946,732   2,554,700   2,409,210   2,774,727   2,515,709   2,792,742
Long-term debt..............................      20,232      14,200      15,336      13,980      16,227      18,939      16,434
Cash dividends per share(1).................        0.09        0.10        0.13        0.19        0.22        0.06        0.07
</TABLE>
    
 
                           AVECOR CARDIOVASCULAR INC.
                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED DECEMBER 31,              SIX MONTHS ENDED
                                              ---------------------------------------------  -------------------
                                                                                             JUNE 30,   JUNE 30,
                                               1993     1994     1995    1996(3)     1997      1997       1998
                                              -------  -------  -------  --------   -------  --------   --------
                                                                                                 (UNAUDITED)
<S>                                           <C>      <C>      <C>      <C>        <C>      <C>        <C>
Net sales...................................  $14,125  $21,486  $33,340  $44,401    $46,864  $24,004    $26,021
Net income (loss)...........................   (1,650)     (39)   3,296     (567)     1,327      790        630
Basic earnings per share....................    (0.26)   (0.01)    0.47    (0.07)      0.17     0.10       0.08
Diluted earnings per share..................    (0.26)   (0.01)    0.45    (0.07)      0.17     0.10       0.08
Total assets................................   15,031   15,877   33,519   37,161     42,759   44,363     46,049
Long-term debt..............................        0        0        0        0      4,694    4,823      4,632
Cash dividends per share....................        0        0        0        0          0        0          0
</TABLE>
 
- ------------------------
 
(1) In each of September 1994, September 1995, and September 1997, Medtronic
    effected a two-for-one common stock split, paid in the form of a 100% stock
    dividend. All references in the Selected Historical Consolidated Financial
    Data to Medtronic's earnings per share and cash dividends per share have
    been restated to reflect these stock splits.
 
(2) Medtronic's net earnings, basic earnings per share, and diluted earnings per
    share reflect the impact of $205.3 million pre-tax nonrecurring charges
    recorded in the third quarter of fiscal 1998.
 
(3) AVECOR's net income (loss), basic earnings per share, and diluted earnings
    per share include a $4.2 million pre-tax loss resulting from a litigation
    settlement with COBE Laboratories, Inc.
 
                                       15
<PAGE>
                           COMPARATIVE PER SHARE DATA
 
   
    The following summary sets forth certain historical per share data of
Medtronic and AVECOR and combined per share data on an unaudited pro forma basis
after giving effect to the Merger on a purchase basis assuming, solely for
illustrative purposes of this presentation, that the Average Stock Price for
Medtronic Common Stock is $56.1875 (the reported closing sale price of Medtronic
Common Stock on September 21, 1998). The actual Average Stock Price that will be
used in the Merger will be the Average Stock price of Medtronic Common Stock for
the 18 consecutive NYSE trading days ending on the second trading day
immediately preceding the Effective Time of the Merger. The unaudited pro forma
data is provided for comparative purposes only and does not purport to be
indicative of actual or future operating results or financial position that
would have occurred or will occur upon consummation of the Merger. The
information presented below should be read in conjunction with the selected
historical financial data and the separate historical financial statements of
Medtronic and AVECOR, including the notes thereto, included or incorporated by
reference in this Proxy Statement/Prospectus. See "Information Incorporated by
Reference" and "Index to Financial Statements." Presentation of full pro forma
financial statements is not included because the Merger does not constitute a
significant business combination and the disclosure is not deemed to be
material.
    
 
   
<TABLE>
<CAPTION>
                                                                                                 DILUTED
                                                                             BASIC EARNINGS     EARNINGS
                                                                               (LOSS) FROM     (LOSS) FROM
                                                                    BOOK       CONTINUING      CONTINUING       CASH
                                                                    VALUE      OPERATIONS      OPERATIONS     DIVIDENDS
                                                                  ---------  ---------------  -------------  -----------
<S>                                                               <C>        <C>              <C>            <C>
MEDTRONIC HISTORICAL DATA:
Per Medtronic share at and for the three months ended July 31,
  1998..........................................................  $    4.43     $    0.32       $    0.32     $    0.07
Per Medtronic share at and for the fiscal year ended April 30,
  1998(1).......................................................       4.36          0.98            0.96          0.22
Per Medtronic share for the fiscal year ended
  April 30, 1997................................................      *              1.11            1.09          0.19
Per Medtronic share for the fiscal year ended
  April 30, 1996................................................      *              0.90            0.89          0.13
 
AVECOR HISTORICAL DATA:
Per AVECOR share at and for the 3 months ended June 30, 1998
  (unaudited)...................................................       4.16          0.05            0.05             0
Per AVECOR share at and for the 12 months ended
  March 31, 1998 (unaudited)....................................       4.11          0.15            0.14             0
Per AVECOR share for the fiscal year ended December 31, 1997....       4.07          0.17            0.17             0
Per AVECOR share for the fiscal year ended December 31,
  1996(2).......................................................      *             (0.07)          (0.07)            0
 
MEDTRONIC AND AVECOR PRO FORMA COMBINED DATA(5):
Per Medtronic share at and for the three months ended July 31,
  1998(3).......................................................       4.43          0.32            0.31          0.07
Per AVECOR share equivalent(6) at and for the three months ended
  June 30, 1998(3)..............................................       0.88          0.06            0.06          0.01
Per Medtronic share at and for the fiscal year ended
  April 30, 1998(1)(4)..........................................       4.36          0.96            0.95          0.22
Per AVECOR share equivalent(6) at and for the fiscal year ended
  April 30, 1998(1)(4) April 30, 1998(1)(4).....................       0.86          0.19            0.18          0.04
</TABLE>
    
 
                                       16
<PAGE>
- ------------------------
 
(1) Medtronic's basic earnings from continuing operations and diluted earnings
    from continuing operations reflect the impact of $205.3 million pre-tax
    nonrecurring charges recorded in the third quarter of fiscal 1998.
 
(2) AVECOR's net income (loss), basic earnings per share, and diluted earnings
    per share include a $4.2 million pre-tax loss resulting from a litigation
    settlement with COBE Laboratories, Inc.
 
   
(3) The combined pro forma data combine the unaudited financial information of
    Medtronic at and for the three-month period ended July 31, 1998 with the
    unaudited financial information of AVECOR at and for the three-month period
    ended June 30, 1998.
    
 
   
(4) The combined pro forma data combine the financial information of Medtronic
    at and for the year ended April 30, 1998 with the unaudited financial
    information of AVECOR at and for the 12-month period ended March 31, 1998.
    
 
   
(5) Pro forma information includes the dilutive impact of estimated annual
    goodwill amortization and foregone interest income.
    
 
   
(6) The equivalent pro forma combined information represents the pro forma
    combined net income and book value multiplied by .1980, which is the assumed
    Conversion Fraction (based on an assumed Average Stock Price of $56.1875
    solely for purposes of this illustration.
    
 
*   Disclosure is not required.
 
                                       17
<PAGE>
                              GENERAL INFORMATION
 
   
    This Proxy Statement/Prospectus is being furnished to the shareholders of
AVECOR in connection with the solicitation by the Board of Directors of AVECOR
of proxies to be voted at the Meeting to be held on October 28, 1998.
    
 
    At the Meeting, AVECOR shareholders will be asked to consider and vote upon
the approval of the Plan of Merger and the Merger Agreement attached to this
Proxy Statement/Prospectus as Appendices A and B, respectively, providing for
the Merger of Merger Subsidiary, a wholly-owned subsidiary of Medtronic, with
and into AVECOR, as a result of which AVECOR will become a wholly-owned
subsidiary of Medtronic. Other terms and provisions related to the Merger are
set forth in the Merger Agreement, as described herein.
 
    The Board of Directors of AVECOR has unanimously approved the Merger. The
Board of Directors of Medtronic has approved the Merger and the issuance of
shares of Medtronic Common Stock in the Merger. See "The Merger--Background of
the Merger." Applicable Minnesota law does not require that Medtronic
shareholders approve the Merger, and no such approval is being sought.
Medtronic, as the sole shareholder of Merger Subsidiary, has approved the
Merger.
 
    Pursuant to the Plan of Merger and the Merger Agreement, upon effectiveness
of the Merger, each outstanding share of AVECOR Common Stock (except for shares
of AVECOR Common Stock owned by Medtronic and shares of AVECOR Common Stock held
by shareholders who properly exercise dissenters' rights under Minnesota law)
will be converted into the right to receive a portion of a share of Medtronic
Common Stock. See "The Merger--General," "--Conversion of AVECOR Common Stock in
the Merger," and "--Rights of Dissenting AVECOR Shareholders."
 
   
    The close of business on September 23, 1998 (the "Record Date") has been
fixed as the record date for determination of the holders of AVECOR Common Stock
who are entitled to receive notice of and to vote at the Meeting or at any
adjournment thereof. As of the Record Date, there were 8,055,975 shares of
AVECOR Common Stock outstanding held by approximately 310 holders of record. The
holders of record on the Record Date of shares of AVECOR Common Stock are
entitled to one vote per share at the Meeting. The presence at the Meeting in
person or by proxy of the holders of a majority of the outstanding shares of
AVECOR Common Stock entitled to vote will constitute a quorum for the
transaction of business. The affirmative vote of the holders of a majority of
the outstanding shares of AVECOR Common Stock is required for approval of the
Merger. Directors and executive officers of AVECOR have agreed to vote AVECOR
shares owned by them in favor of the Merger. Medtronic intends to have all of
the 346,960 shares of AVECOR stock owned by Medtronic voted in favor of the
Merger. See "The Merger--Vote Required" and "--Voting Agreements."
    
 
    Representatives of PricewaterhouseCoopers LLP, AVECOR's independent
accountants, are expected to be present at the Meeting. Such representatives
will have the opportunity to make a statement if they so desire and are expected
to be available to respond to appropriate questions. (On July 1, 1998, Coopers &
Lybrand L.L.P merged with Price Waterhouse LLP to form PricewaterhouseCoopers
LLP.)
 
    A proxy card is enclosed for use by AVECOR shareholders. Such shareholders
are solicited on behalf of the Board of Directors of AVECOR to SIGN AND RETURN
THE PROXY CARD IN THE ACCOMPANYING ENVELOPE. No postage is required if mailed
within the United States.
 
    All properly executed proxies not revoked will be voted at the Meeting in
accordance with the instructions contained therein. Proxies that are signed by
shareholders but lack specific instructions will be voted in favor of approval
of the Merger. A shareholder who has executed and returned a proxy may revoke it
at any time before it is voted at the Meeting, but only by executing and
returning a proxy bearing a later date, by giving written notice of revocation
to the Secretary of AVECOR, or by attending the Meeting and voting in person.
Abstentions will be treated as shares present for purposes of determining a
quorum for the Meeting but will have the same effect as a vote against approval
of the Merger. If a broker
 
                                       18
<PAGE>
or other record holder or nominee indicates on a proxy that it does not have
direction or authority as to certain shares to vote on the Merger, those shares
will be considered present at the Meeting for purposes of determining a quorum
but will have the same effect as a vote against approval of the Merger.
 
    If any other matters are properly presented for consideration at the
Meeting, the persons named in the enclosed form of proxy and acting thereunder
will have discretion to vote on such matters in accordance with their best
judgment.
 
    THE BOARD OF DIRECTORS OF AVECOR RECOMMENDS THAT THE SHAREHOLDERS VOTE FOR
THE APPROVAL OF THE PLAN OF MERGER. See "The Merger--Interests of Certain
Persons in the Merger" for a discussion of conflicts of interest that certain
directors and members of management of AVECOR may have in connection with the
Merger.
 
    SHAREHOLDERS SHOULD NOT SEND THEIR STOCK CERTIFICATES WITH THEIR PROXY
CARDS.
 
    In addition to soliciting proxies by mail, the directors, officers, or
regular employees of AVECOR may, but without compensation other than their
regular compensation, solicit proxies personally or by telephone or fax. AVECOR
intends to reimburse brokerage houses and other custodians, nominees, and
fiduciaries for reasonable out-of-pocket expenses incurred in forwarding copies
of solicitation material to beneficial owners of AVECOR Common Stock held of
record by such persons. AVECOR and Medtronic have agreed to share equally all
expenses relating to the printing and mailing of this Proxy Statement/
Prospectus and the filing of it with the Commission.
 
   
    The mailing of this Proxy Statement/Prospectus to shareholders of AVECOR is
expected to commence on or about September 28, 1998.
    
 
                                   THE MERGER
 
    SET FORTH BELOW IS A BRIEF DESCRIPTION OF CERTAIN TERMS OF THE MERGER
AGREEMENT AND RELATED MATTERS. THIS DESCRIPTION DOES NOT PURPORT TO BE COMPLETE
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE PLAN OF MERGER AND THE
MERGER AGREEMENT, WHICH ARE ATTACHED HERETO AS APPENDICES A AND B AND ARE
INCORPORATED HEREIN BY REFERENCE.
 
GENERAL
 
    Medtronic, Merger Subsidiary, and AVECOR have entered into the Merger
Agreement, which provides that Merger Subsidiary will be merged with and into
AVECOR, with AVECOR becoming a wholly-owned subsidiary of Medtronic. In the
Merger, AVECOR will change its name to "Medtronic AVECOR Cardiovascular, Inc."
Each outstanding share of AVECOR Common Stock (except shares owned by Medtronic
and shares held by AVECOR shareholders who perfect dissenters' rights under
Minnesota law) will be converted at the Effective Time (as defined below) into
the right to receive the portion of a share of Medtronic Common Stock equal to
$11.125 divided by the Average Stock Price of Medtronic Common Stock for a
specified determination period, as described in further detail below. See "The
Merger--Conversion of AVECOR Common Stock in the Merger."
 
EFFECTIVE TIME OF THE MERGER
 
    As soon as practicable after the conditions to consummation of the Merger
described below have been satisfied or waived, and unless the Merger Agreement
has been terminated as provided below, articles of merger containing the Plan of
Merger will be filed with the Secretary of State of the State of Minnesota, at
which time the Merger will become effective (the "Effective Time"). It is
presently contemplated that the Effective Time will be as soon as practicable
after approval of the Merger at the Meeting. See "The Merger--Conditions;
Waiver."
 
                                       19
<PAGE>
BACKGROUND OF THE MERGER
 
    The terms of the Merger Agreement are the result of arm's-length
negotiations between representatives of Medtronic and AVECOR. The following is a
brief discussion of the background of these negotiations, the Merger and related
discussions.
 
    Over a period of time, AVECOR's Board of Directors and senior management had
explored methods of enhancing shareholder value through internal growth and
development, the acquisition of technology, or the formation of joint ventures
with others in the medical device or cardiopulmonary bypass products industries.
 
    In November 1997, AVECOR engaged Piper Jaffray exclusively to explore
various strategic alternatives for AVECOR, including the acquisition of 15% or
more of AVECOR's equity or assets by a third party. In connection with its
engagement, Piper Jaffray explored the alternatives of AVECOR continuing its
current strategy of internal growth, expanding into other businesses within the
cardiopulmonary market or making acquisitions within a new market.
 
    In December 1997, AVECOR management was contacted by and met with the
management of Suitor A, a company engaged in, among other things, medical device
businesses other than in the cardiopulmonary market to discuss the
cardiopulmonary industry. No discussions were held as to the terms of a possible
transaction.
 
    On March 3, 1998, AVECOR executives and executives of Suitor B, a large,
diversified medical products company with an existing business in the
cardiopulmonary market, met to discuss a potential business combination.
Representatives of Piper Jaffray and Suitor B's investment banker, together with
AVECOR and Suitor B's executives, met again on March 31, 1998 to discuss
financial projections of AVECOR and potential combination synergies. Subsequent
to a meeting and additional discussion between Piper Jaffray and Suitor B's
investment banker, Suitor B submitted a nonbinding indication of interest on
April 16, 1998. Piper Jaffray presented such indication of interest to AVECOR's
Board at a meeting held on April 21, 1998.
 
    Following that Board meeting, further discussions took place between Piper
Jaffray and Suitor B's investment banker. These discussions primarily concerned
valuation issues and were undertaken by Piper Jaffray with the objective of
moving Suitor B towards a higher valuation of AVECOR. Suitor B refused to
increase the valuation set forth in its April 16, 1998 indication of interest.
Suitor B was then allowed to conduct due diligence on AVECOR for a period of
three weeks, beginning on May 6, 1998. On May 21, 1998, Anthony Badolato, the
Chief Executive Officer of AVECOR, and an executive of Suitor B discussed
conditions of Suitor B to proceeding with a transaction. These discussions
resulted in an impasse.
 
    On May 5, 1998, Mr. Badolato received a telephone call from Suitor A,
indicating an interest to meet and discuss a potential combination. On May 6,
1998, Piper Jaffray talked with Suitor A to qualify Suitor A's interest and to
discuss Suitor A's preliminary valuation range. The AVECOR Board of Directors
met on May 7, 1998, and Piper Jaffray reviewed some of the aspects of a
potential transaction with either Suitor A or Suitor B, and it was agreed that
management would meet with representatives of Suitor A. On May 11, 1998, members
of AVECOR and Suitor A's senior management met to discuss the cardiopulmonary
market and a potential combination. Following an evaluation and analysis of a
potential combination during the weeks of May 11 and May 18, 1998, Suitor A
decided not to proceed further.
 
    On May 27, 1998, Suitor C, a large potential financial buyer with a history
of acquiring medical device businesses, met with AVECOR management and Piper
Jaffray to discuss, on a very preliminary basis, a potential combination.
Following an evaluation of a potential combination, Suitor C determined not to
pursue such a transaction with AVECOR. This determination was communicated to
Piper Jaffray in early June 1998.
 
                                       20
<PAGE>
    Also on May 27, 1998, Glen D. Nelson, M.D., the Vice Chairman of Medtronic,
contacted Mr. Badolato by telephone and indicated an interest in meeting with
Mr. Badolato to discuss a range of topics concerning AVECOR's products,
consolidation in the medical device industry, and possible synergies between
Medtronic and AVECOR. On June 1, 1998, Dr. Nelson, Philip M. Laughlin,
Medtronic's Senior Vice President and President, Cardiac Surgery, and Mr.
Badolato had a meeting during which Dr. Nelson expressed Medtronic's interest in
acquiring AVECOR. On June 5, 1998, Medtronic submitted a nonbinding indication
of interest to acquire AVECOR. Based on this indication of interest, Medtronic
was permitted to conduct due diligence on AVECOR.
 
    On June 8, 1998, Piper Jaffray had further discussions with Suitor B's
investment banker and informed Suitor B's investment banker that AVECOR had
received an indication of interest from another party.
 
    During the weeks of June 8 and June 15, 1998, Medtronic conducted due
diligence, examining the same written materials regarding AVECOR's operations
that had been made available on a confidential basis to Suitor B.
 
    On June 12, 1998, Piper Jaffray had additional discussions with Suitor B's
investment banker and informed Suitor B's investment banker that a meeting of
AVECOR's Board of Directors was scheduled for the week of June 22, 1998 to
discuss all indications of interest that had been expressed. Piper Jaffray also
invited Suitor B's investment banker to update Suitor B's indication of interest
before the scheduled meeting of AVECOR's Board, and in doing so to address the
conditions that had previously resulted in an impasse.
 
    On June 19 and June 22, 1998, representatives of Piper Jaffray and Medtronic
had various telephone conversations focusing on valuation and process. On June
24, 1998, Medtronic submitted a revised indication of interest in the form of a
terms sheet, containing a price greater than that contained in the June 5, 1998
indication of interest.
 
    During this June time period, Suitor D, another company engaged in the
cardiopulmonary business, called Mr. Badolato to discuss a potential
combination, renewing discussions that had previously been carried on in early
1997. An executive of Suitor D and Mr. Badolato met in New York on June 13, 1998
to discuss a potential transaction. On June 16, 1998, Suitor D submitted a
nonbinding indication of interest.
 
    On June 19, 1998, AVECOR received a revised, nonbinding indication of
interest from Suitor B. This revised indication of interest did not represent a
change in the valuation set forth in Suitor B's April 16, 1998 indication of
interest, but did indicate certain flexibility on the part of Suitor B with
respect to the conditions that had previously resulted in an impasse.
 
    On June 24, 1998, members of AVECOR's senior management made presentations
to Suitor D's management.
 
    On June 25, 1998, the AVECOR Board met to discuss the June 19, 1998 revised,
nonbinding indication of interest from Suitor B, the June 16, 1998 nonbinding
indication of interest by Suitor D, and the revised Medtronic indication of
interest (in the form of a terms sheet) of June 24, 1998. The AVECOR Board
authorized continued due diligence and negotiation of a possible agreement with
Medtronic.
 
    On June 25, 1998, the Board of Directors of Medtronic approved the
acquistion of AVECOR, subject to final negotiations by senior management, and
authorized Medtronic's officers to undertake all acts necessary or desirable to
effect the Merger.
 
    On June 26, 1998, Piper Jaffray informed Suitor B of the AVECOR Board's
decision to negotiate with another company. On the same date, AVECOR sent a
revised terms sheet modifying Medtronic's written proposal to Medtronic. During
the morning of June 29, 1998, Suitor B submitted a further revised, nonbinding
indication of interest, which did not change the price set forth in the April 16
and June 19, 1998 indications of interest but removed the conditions that had
previously led to the impasse in
 
                                       21
<PAGE>
AVECOR's discussions with Suitor B. Piper Jaffray contacted Suitor B's
investment banker on the same day to discuss an increased price, but the request
for a higher price was refused.
 
    In addition, on the same date, Piper Jaffray informed Suitor D regarding the
AVECOR Board's decision to negotiate with a company other than Suitor D.
 
    During the afternoon of June 29, 1998, AVECOR and Medtronic discussed the
revised terms sheet sent to Medtronic on June 26, 1998. Prior to execution of
the terms sheet with Medtronic, Piper Jaffray contacted Suitor B to acknowledge
receipt of Suitor B's June 29, 1998 revised indication of interest and to inform
Suitor B that AVECOR would be proceeding with exclusive negotiations with
another party. Late in the afternoon on June 29, AVECOR executed a nonbinding
terms sheet with Medtronic, containing the $11.125 per share consideration in
the form of Medtronic Common Stock and providing that negotiations would be held
only between AVECOR and Medtronic until July 24, 1998.
 
   
    On July 1, 1998, Suitor B submitted another revised indication of interest
containing a price higher than set forth in its previous indications of
interest, but still lower than the price offered by Medtronic. No contact was
made with Suitor B, given the exclusivity arrangement contained in the executed
terms sheet with Medtronic.
    
 
    During the period of July 7-12, 1998, members of Medtronic's senior
management and Medtronic's legal counsel met with members of AVECOR's senior
management, representatives of Piper Jaffray, and AVECOR's legal counsel and
held detailed discussions regarding the possible terms of a merger involving the
two companies. With the advice of legal counsel and financial advisors,
Medtronic and AVECOR negotiated the terms of the Merger Agreement and the Stock
Option Agreement.
 
    On July 10, 1998, AVECOR received a letter from Suitor B indicating that
Suitor B was prepared to significantly increase the price contained in its prior
indications of interest, but which failed to specify a price. Suitor B's
indication of interest was subject to AVECOR not having executed a definitive
agreement with another party, due diligence investigation, Board approval, and
other conditions. AVECOR's senior management, representatives of Piper Jaffray,
and AVECOR's legal counsel discussed the letter from Suitor B at that time.
Later that day, Piper Jaffray informed Medtronic that AVECOR had received a
revised proposal from another party, and invited Medtronic to increase the price
per share it would offer prior to presentation of the Merger Agreement to
AVECOR's Board of Directors. Medtronic declined.
 
    On July 12, 1998, AVECOR's Board of Directors held a special telephone
meeting to review, with the advice and assistance of AVECOR's management and
financial and legal advisors, the proposed Merger Agreement and Stock Option
Agreement and the transactions contemplated thereby. Piper Jaffray also reviewed
the terms of Suitor B's July 10, 1998 letter, pointing out that a new offer
price had not been stated, that the amount of Suitor B's last offer price was
below the price being offered by Medtronic, and that there were other
uncertainties regarding this proposal. Piper Jaffray further indicated that it
had advised Medtronic that a competing offer might be forthcoming, had invited
Medtronic to increase its offer, and that Medtronic chose not to increase its
offer. After extensive discussion and consideration of various materials,
including drafts of the agreements and a presentation by Piper Jaffray setting
forth its analysis of the proposed transaction, the AVECOR Board unanimously
approved the Merger, subject to the resolution of various issues within
guidelines established by the AVECOR Board. The Board also amended AVECOR's
shareholder rights plan to provide that the Merger would not cause the rights
contemplated by the plan to become exercisable.
 
    In the evening of July 12, 1998, following resolution of the remaining
issues, Medtronic and AVECOR executed the Merger Agreement and Stock Option
Agreement. On July 13, 1998, prior to the opening of trading on the Nasdaq
National Market and the NYSE, Medtronic and AVECOR issued a joint press release
announcing the execution of the Merger Agreement.
 
                                       22
<PAGE>
AVECOR'S REASONS FOR THE MERGER; RECOMMENDATION OF THE AVECOR BOARD OF DIRECTORS
 
    At the July 12, 1998 meeting, the AVECOR Board unanimously determined that
the Merger is in the best interests of AVECOR and its shareholders, approved and
adopted the Merger Agreement and the Plan of Merger, and recommended that AVECOR
shareholders vote to approve and adopt the Merger Agreement, the Plan of Merger,
and the transactions contemplated thereby.
 
    Prior to making its determination, the AVECOR Board consulted with senior
management with respect to strategic and operational matters and legal counsel
with respect to the legal duties of the AVECOR Board, regulatory matters, tax
matters, and the Merger Agreement, the Stock Option Agreement, and the voting
agreements and issues related thereto. The AVECOR Board also consulted with
Piper Jaffray, financial advisor to AVECOR, with respect to the financial
aspects and fairness from a financial point of view of the $11.125 per share
consideration to be received by the shareholders of AVECOR. In reaching its
determination to approve and adopt the Merger Agreement, the AVECOR Board also
considered a number of factors, including, without limitation:
 
     (i) the business, earnings, operations, financial condition, and prospects
         of Medtronic and AVECOR, both individually and on a combined basis,
         including, but not limited to, AVECOR's and Medtronic's respective
         recent and historic stock and earnings performance;
 
     (ii) the financial analyses and other information with respect to AVECOR
          and Medtronic presented to the AVECOR Board by Piper Jaffray, as well
          as the AVECOR Board's own knowledge of AVECOR and Medtronic and their
          respective businesses;
 
    (iii) AVECOR's strategic alternatives, including remaining a separate
          company and growing internally or through acquisitions, remaining a
          separate company for the near term while continuing to explore a
          future acquisition of AVECOR, or engaging in a merger of equals or
          joint venture transaction with another party, including certain risks
          involved in remaining a separate company such as the risks of being
          unable to meet or exceed projections and growth rates due to
          increasing competitive pressures in the markets for its products;
 
     (iv) certain factors influencing the heart/lung bypass device industry,
          including pricing pressures affecting products in the heart/lung
          bypass circuit, the need to compete by offering a complete line of
          devices for the heart/lung bypass circuit, centralization of customer
          purchasing decisions by group purchasing and managed care
          organizations, and the impact of competitor acquisitions and control
          of groups providing perfusion services to hospitals;
 
     (v) the overall strategic fit between AVECOR and Medtronic in view of their
         respective product lines, which together would provide current AVECOR
         customers with a complete line of products in the heart/lung bypass
         circuit from a single source, as well as their respective markets and
         distribution channels and the potential synergies, efficiencies, and
         cost savings that could be realized through a combination of AVECOR and
         Medtronic;
 
     (vi) the amount and form of the consideration to be received by AVECOR
          shareholders in the Merger, the historical trading ranges of AVECOR
          Common Stock and Medtronic Common Stock, and the estimated future
          financial results of AVECOR and Medtronic;
 
    (vii) the opportunity for AVECOR shareholders to receive a premium over the
          market price for their shares immediately prior to the announcement of
          the Merger (with the consideration to be received representing a
          premium of approximately 74.4% over the closing price of $6.38 per
          share of AVECOR Common Stock as of the date four weeks prior to the
          announcement of the Merger);
 
   (viii) the opportunity for AVECOR shareholders to receive future cash
          dividends with respect to their shareholdings;
 
                                       23
<PAGE>
     (ix) the opportunity for AVECOR shareholders to continue equity
          participation in a larger, more diversified medical products
          enterprise and to share in the long-term growth of Medtronic following
          the Merger, including participation in the combination of benefits
          referred to above, if achieved;
 
     (x) the effect of the Merger on AVECOR employees and benefits and
         opportunities potentially available to AVECOR employees within the
         combined company;
 
     (xi) the financial advice provided by Piper Jaffray and the written opinion
          of Piper Jaffray that, based upon and subject to certain matters set
          forth in the opinion and such other factors as Piper Jaffray
          considered relevant, it is Piper Jaffray's opinion that the
          consideration proposed to be received by the shareholders of AVECOR in
          the Merger pursuant to the Merger Agreement is fair, from a financial
          point of view, to the shareholders of AVECOR as of the date of the
          opinion of July 12, 1998 (with the full text of such opinion, which
          should be read in its entirety by AVECOR shareholders, attached as
          Appendix D to this Proxy Statement/Prospectus, setting forth the
          procedures followed, the factors considered, and the assumptions made
          by Piper Jaffray);
 
    (xii) the terms and conditions of the Merger Agreement, including the
          consideration to be received by the shareholders of AVECOR, the
          parties' representations, warranties, and covenants, the conditions to
          their respective obligations, the amount of termination fees payable
          under the Merger Agreement and the circumstances under which such
          termination fees will be payable, and the likelihood that the Merger
          would be consummated;
 
   (xiii) the terms and conditions of the Stock Option Agreement, including the
          circumstances under which the stock option granted thereunder will be
          exercisable; and
 
    (xiv) that the Merger will be accounted for under the purchase method of
          accounting and that as a condition to the Merger Agreement the Merger
          will be a tax-free transaction for federal income tax purposes.
 
    In view of the number and wide variety of factors considered in connection
with its evaluation of the Merger, the AVECOR Board did not consider it
practicable to, nor did it attempt to, quantify or otherwise assign relative
weights to the specific factors considered in reaching its determination. The
AVECOR Board viewed its position and recommendations as being based on the
totality of the information and factors presented to and considered by it. In
addition, individual members of the AVECOR Board may have given different weight
to different information and factors. See "--Background of the Merger."
 
    BASED UPON ITS CONSIDERATION OF THE FOREGOING MATTERS AND OTHER ADVICE AND
INFORMATION DEEMED RELEVANT, THE AVECOR BOARD OF DIRECTORS UNANIMOUSLY
RECOMMENDS THAT AVECOR SHAREHOLDERS VOTE TO APPROVE AND ADOPT THE PLAN OF
MERGER, THE MERGER AGREEMENT, AND THE TRANSACTIONS CONTEMPLATED THEREBY.
 
MEDTRONIC'S REASONS FOR THE MERGER
 
    Medtronic believes that the acquisition of AVECOR will enhance Medtronic's
surgical perfusion product line offerings and that, by concentrating on the best
technologies from both Medtronic and AVECOR, Medtronic will augment its
offerings of industry-leading products as it streamlines manufacturing
capabilities and achieves efficiencies of scale.
 
OPINION OF AVECOR'S FINANCIAL ADVISOR
 
    Pursuant to an engagement letter dated November 14, 1997, AVECOR retained
Piper Jaffray to act as its exclusive representative and financial advisor and,
if requested, to render to the Board of Directors an opinion as to the fairness,
from a financial point of view, of the consideration to be received by AVECOR
shareholders in the Merger.
 
                                       24
<PAGE>
    At a meeting of the Board of Directors on July 12, 1998, Piper Jaffray made
a presentation summarizing the proposal to acquire AVECOR, analyzing the
proposal (in a manner similar to that summarized below), and rendering its
written opinion to the Board of Directors to the effect that, as of such date,
and subject to the assumptions, factors, and limitations set forth therein, the
consideration to be received by AVECOR shareholders pursuant to the Merger
Agreement is fair, from a financial point of view, to AVECOR shareholders. A
copy of Piper Jaffray's written opinion dated July 12, 1998, which sets forth
the assumptions made, matters considered, and limits on the review taken, is
attached as Appendix D to this Proxy Statement/Prospectus and is incorporated
herein by reference (the "Piper Jaffray Opinion"). AVECOR shareholders are urged
to read the Piper Jaffray Opinion in its entirety. The description of the Piper
Jaffray Opinion set forth herein is qualified in its entirety by reference to
the full text of such opinion. The Piper Jaffray Opinion is directed to and is
for the use and benefit of the Board of Directors of AVECOR and is rendered to
the Board of Directors in connection with its consideration of the Merger. The
opinion is not intended to be and does not constitute a recommendation to any
shareholder as to how such shareholder should vote with respect to the Merger.
 
    In arriving at its opinion, Piper Jaffray made such review, analyses, and
inquiries as it deemed necessary and appropriate under the circumstances. Among
other things, it reviewed (i) a draft dated July 10, 1998 of the Merger
Agreement, (ii) certain public information related to Medtronic, (iii) certain
publicly available financial and securities data of Medtronic and selected
public companies deemed comparable to Medtronic, (iv) certain analyst reports on
Medtronic, (v) to the extent publicly available, information concerning selected
transactions deemed comparable to the proposed Merger, (vi) certain publicly
available information relative to AVECOR and selected public companies deemed
comparable to AVECOR, (vii) certain unaudited internal financial information of
AVECOR on a stand-alone basis prepared for financial planning purposes, and
furnished by AVECOR management, and (viii) certain publicly available financial
and securities data of AVECOR. Piper Jaffray had discussions with members of the
management of AVECOR concerning the financial condition, current operating
results, and business outlook for AVECOR on a stand-alone basis.
 
    Piper Jaffray relied upon and assumed the accuracy, completeness, and
fairness of the financial statements and other information provided by AVECOR,
or otherwise made available to Piper Jaffray, and did not assume responsibility
for the independent verification of such information. Piper Jaffray relied upon
the assurance of the management of AVECOR that the information provided by
AVECOR had been prepared on a reasonable basis, and, with respect to financial
planning data and other business outlook information, reflected the best
currently available estimates, and that they were not aware of any information
or facts that would make the information provided incomplete or misleading.
 
    Set forth below is a summary of selected analyses Piper Jaffray relied upon
in rendering its opinion:
 
STOCK TRADING HISTORY
 
    Piper Jaffray reviewed the stock trading history of AVECOR Common Stock.
Piper Jaffray presented the following stock price data for AVECOR relative to
specified periods prior to July 9, 1998:
 
<TABLE>
<S>                                                                  <C>
Proposed Merger Price..............................................  $  11.125
30 day average.....................................................  $    7.00
60 day average.....................................................  $    6.94
90 day average.....................................................  $    6.97
52 week high.......................................................  $   12.88
52 week low........................................................  $    5.00
</TABLE>
 
    Piper Jaffray also presented stock price and volume performance data for
AVECOR Common Stock for specified periods, and the relationship between
movements in the trading prices of AVECOR Common
 
                                       25
<PAGE>
Stock and movements in trading prices of the common stock of comparable
companies and Nasdaq Composite Index.
 
COMPARABLE COMPANY ANALYSIS
 
    Piper Jaffray compared selected financial data and ratios for AVECOR to the
corresponding data and ratios for a group of companies deemed comparable to
AVECOR, all of which are publicly traded medical technology companies. The
Comparable Company Group consisted of the following nine publicly-held medical
technology companies: ATS Medical Inc., Haemonetics Corporation, ICU Medical
Inc., Merit Medical Systems Inc., Novametrix Medical Systems, Minntech
Corporation, Utah Medical Products, Inc., Vital Signs Inc., and Zoll Medical
Corporation. The financial data and ratios compared as part of this analysis
included the stock price as a percentage of the 52-week high; the multiple of
company value (market capitalization plus debt less cash) to revenue; the
multiple of company value to earnings before interest and taxes ("EBIT"); the
multiple of market price to latest-12-month ("LTM") earnings per share; the
multiple of market price to estimated 1998 earnings per share; the multiple of
market price to estimated 1999 earnings per share; sales (LTM); gross margin
(LTM); operating margin (LTM); net margin (LTM); and one-year historical revenue
growth.
 
    This analysis showed that this group of medical technology companies had a
stock price as a percentage of the 52-week high ranging from 67.8% to 89.6%,
with a mean of 81.5% and a median of 85.7%, compared to 86.4% for AVECOR based
on a merger value of $11.125 per share; a multiple of company value to revenue
ranging from 0.7 to 7.1, with a mean of 2.4 and a median of 2.0, compared with
1.9 for AVECOR based on a merger value of $11.125 per share; a multiple of
company value to EBIT ranging from 7.6 to 21.0, with a mean of 13.5 and a median
of 12.6, compared with 49.8 for AVECOR based on a merger value of $11.125 per
share; a multiple of market price to LTM earnings per share ranging from 13.7 to
58.0, with a mean of 28.0 and a median of 19.2, compared with 74.2 for AVECOR
based on a merger value of $11.125 per share; a multiple of market price to
estimated 1998 earnings per share ranging from 12.1 to 50.0, with a mean of 22.9
and a median of 20.8, compared with 44.5 for AVECOR based on a merger value of
$11.125 per share; a multiple of market price to estimated 1999 earnings per
share ranging from 10.4 to 44.1, with a mean of 18.4 and a median of 15.0,
compared with 30.9 for AVECOR based on a merger value of $11.125 per share; LTM
sales ranging from $15.3 million to $285.8 million, with a mean of $77.6 million
and a median of $54.1 million, compared with $47.3 million for AVECOR; gross
margin (LTM) ranging from 35.4% to 58.1%, with a mean of 48.6% and a median of
50.3%, compared with 40.8% for AVECOR; operating margin (LTM) ranging from 4.6%
to 24.9%, with a mean of 12.8% and a median of 10.8%, compared with 3.7% for
AVECOR; net margin (LTM) ranging from 1.6% to 17.9%, with a mean of 9.8% and a
median of 9.2%, compared with 2.5% for AVECOR; and one-year historical revenue
growth ranging from -34.2% to 28.7%, with a mean of 8.1% and a median of 11.9%,
compared with 6.5% for AVECOR.
 
COMPARABLE TRANSACTION ANALYSIS
 
    Piper Jaffray reviewed and analyzed certain financial data from a group of
21 selected change-in-control transactions in the medical technology industry
announced or completed between January 1, 1995, and July 9, 1998, and deemed
comparable to the Merger. For these transactions, Piper Jaffray analyzed the
ratio of target company value to target company LTM sales; target company value
to LTM earnings before interest and taxes ("EBIT"); and target equity value to
LTM net income. For these transactions, this analysis showed that the ratio of
target company value to target company LTM sales ranged from 1.0 to 5.5, with a
mean of 2.7 and median of 2.5, compared with a multiple of 1.9 for AVECOR based
on a merger value of $11.125 per share; the ratio of target company value to LTM
EBIT ranged from 10.7 to 34.0, with a mean of 20.7 and a median of 18.9,
compared with a multiple of 49.8 for AVECOR based on a merger value of $11.125
per share; and the ratio of target equity value to LTM net income ranged from
13.7 to
 
                                       26
<PAGE>
72.5, with a mean of 35.1 and a median of 32.0, compared with a multiple of 74.2
for AVECOR based on a merger value of $11.125 per share.
 
PREMIUMS PAID ANALYSIS
 
    Piper Jaffray also reviewed and analyzed the premiums paid in recent
acquisitions of a group of publicly held companies. The analysis examined the
ratio between the proposed acquisition offer price and the target company's
price per share at various times prior to the announcement of a possible
transaction. In selecting comparable transactions for the premiums paid
analysis, Piper Jaffray only included medical technology businesses involved in
change-in-control transactions completed or pending since January 1, 1995. This
analysis revealed 40 transactions that Piper Jaffray deemed to be comparable.
For these transactions, the implied premiums paid, based on the target share
price four weeks prior to the announcement of a possible transaction compared
with the proposed acquisition offer price, ranged from -9.3% to 93.1%, with a
mean of 36.1% and a median of 33.2%, compared with a premium of 74.4% for the
Merger. The implied premiums paid, based on the target company share price one
week prior to announcement compared with the proposed acquisition offer price,
ranged from -11.8% to 60.9%, with a mean of 27.4% and a median of 25.8%,
compared with a premium of 50.7% for AVECOR based on a merger value of $11.125
per share.
 
DISCOUNTED CASH FLOW ANALYSIS
 
    Using a discounted cash flow analysis, Piper Jaffray calculated a range of
theoretical per share values for AVECOR, based on the net present value of
implied future cash flows of AVECOR from 1998 to 2001 and a terminal value from
a multiple of operating income in 2001. Piper Jaffray used internal financial
planning data prepared by management of AVECOR for 1998 through 2001 that
reflect AVECOR as a stand-alone entity. Piper Jaffray calculated the range of
net present values for AVECOR based on a range of discount rates of 20% to 25%
and a range of terminal value multiples of forecasted 2001 EBIT of 11.0x to
15.0x. This analysis yielded a range of estimated present values for AVECOR of
between $5.86 per share and $8.86 per share, compared with a merger value of
$11.125 per share.
 
ANALYSIS OF MEDTRONIC COMMON STOCK
 
    Piper Jaffray reviewed general background information concerning Medtronic.
Piper Jaffray reviewed certain publicly available analyst estimates and ratings
of Medtronic Common Stock, the annual returns of Medtronic Common Stock over
various periods, the relative price performance to the S&P 500 Composite Index
over the last five years and the stock price over several periods in the last
year. In addition, Piper Jaffray compared selected financial data and ratios for
Medtronic to the corresponding data and ratios for a group of companies deemed
comparable to Medtronic, all of which are publicly traded medical technology
companies. The comparable company group consisted of the following five
companies: Arterial Vascular Engineering Inc., Boston Scientific Corporation,
Guidant Corporation, Sofamor/Danek Group Inc., and Stryker Corporation. The
financial data and ratios compared as part of this analysis included the stock
price as a percentage of the 52-week high; the multiple of company value to
revenue; the multiple of company value to EBIT; the multiple of market price to
LTM earnings per share; the multiple of market price to estimated 1998 earnings
per share; the multiple of market price to estimated 1999 earnings per share;
LTM sales; gross margin (LTM); operating margin (LTM); net margin (LTM); and
one-year historical revenue growth.
 
    This analysis showed that this group of medical technology companies had a
stock price as a percentage of the 52-week high ranging from 86.3% to 98.7%,
with a mean of 94.0% and a median of 95.2%, compared to 97.3% for Medtronic; a
multiple of company value to revenue ranging from 3.8 to 11.3, with a mean of
7.6 and a median of 7.8, compared with 12.1 for Medtronic; a multiple of company
value to EBIT ranging from 19.9 to 56.8, with a mean of 32.7 and a median of
28.0, compared with 35.2 for Medtronic; a multiple of market price to LTM
earnings per share ranging from 31.4 to 98.3, with a mean of
 
                                       27
<PAGE>
55.0 and a median of 41.4, compared with 54.0 for Medtronic; a multiple of
market price to estimated 1998 earnings per share ranging from 16.6 to 39.3,
with a mean of 30.6 and a median of 34.4, compared with 47.5 for Medtronic; a
multiple of market price to estimated 1999 earnings per share ranging from 20.8
to 30.6, with a mean of 26.6 and a median of 28.4, compared with 39.2 for
Medtronic.
 
    Although the summary set forth above does not purport to be a complete
description of the analyses performed by Piper Jaffray, the material analyses
performed by Piper Jaffray in rendering its opinion have been summarized. The
preparation of a fairness opinion is not necessarily susceptible to partial
analysis or summary description. Piper Jaffray believes that its analyses and
the summary set forth above must be considered as a whole and that selecting
portions of its analyses, without considering all analyses, or selecting part or
all of the above summary, without considering all factors and analyses, would
create an incomplete view of the processes underlying the analyses set forth in
the Piper Jaffray Opinion. In addition, Piper Jaffray may have given various
analyses more or less weight than other analyses but no analysis was given
materially more weight than any other analysis. The fact that any specific
analysis has been referred to in the summary above is not meant to indicate that
such analysis was given greater weight than any other analysis.
 
    The analyses performed by Piper Jaffray are not necessarily indicative of
actual values or actual future results, which may be significantly more or less
favorable than suggested by such analyses. Such analyses were prepared solely as
part of Piper Jaffray's analysis of the fairness of the consideration to be paid
in connection with the Merger to AVECOR shareholders. The analyses do not
purport to be appraisals or to reflect the prices at which AVECOR might actually
be sold or the prices at which any securities may trade at the present time or
at any time in the future.
 
    Piper Jaffray was selected by AVECOR on the basis of its experience in
connection with mergers and acquisitions and its knowledge of AVECOR. Piper
Jaffray is a nationally recognized investment banking firm and is regularly
engaged in the valuation of businesses and their securities in connection with
mergers and acquisitions, underwritings and secondary distributions of
securities, private placements, and valuations for estate, corporate, and other
purposes. Piper Jaffray has acted as exclusive financial advisor to AVECOR in
connection with the Merger and will receive a fee of approximately $950,000 for
its services, which is contingent upon consummation of the Merger. Piper Jaffray
will receive a separate fee of $250,000 for providing its opinion to AVECOR,
which will be credited against the fee for its services. This opinion fee is not
contingent upon the consummation of the Merger. AVECOR has also agreed to
indemnify Piper Jaffray against certain liabilities in connection with the
provision of these services. Piper Jaffray acted as lead manager of a public
stock offering of AVECOR Common Stock on June 21, 1995 and provides research on
AVECOR. In the ordinary course of business, Piper Jaffray and its affiliates may
actively trade securities of Medtronic and AVECOR for their own accounts or the
accounts of their customers and accordingly, may at any time hold a long or
short position in such securities.
 
VOTE REQUIRED
 
   
    Approval of the Merger requires the affirmative vote of the holders of a
majority of the outstanding shares of AVECOR Common Stock. Each holder of AVECOR
Common Stock outstanding as of the Record Date is entitled to one vote for each
share held. On the Record Date, there were 8,055,975 shares of AVECOR Common
Stock outstanding. Of such shares, 1,084,524 shares (approximately 13.5% of the
outstanding shares of AVECOR Common Stock) are beneficially owned by directors
and executive officers of AVECOR. AVECOR's directors and executive officers have
executed voting agreements under which such persons have agreed to vote shares
of AVECOR Common Stock owned by them in favor of the Merger. See "The
Merger--Voting Agreements." In addition, of the shares of AVECOR Common Stock
outstanding as of the Record Date, Medtronic, through a wholly-owned subsidiary,
owns 346,960 shares of AVECOR Common Stock, which represent approximately 4.3%
of the shares outstanding and entitled to vote as of the Record Date. Medtronic
intends to have all such shares voted in favor of the Merger.
    
 
                                       28
<PAGE>
    Medtronic, as the sole shareholder of Merger Subsidiary, has approved the
Plan of Merger and the Merger Agreement. Approval of the Plan of Merger and the
Merger Agreement by Medtronic's shareholders is not required under Minnesota law
and is not being sought.
 
CONVERSION OF AVECOR COMMON STOCK IN THE MERGER
 
    At the Effective Time of the Merger, each issued and outstanding share of
AVECOR Common Stock, except shares of AVECOR Common Stock owned by Medtronic and
any shares of AVECOR Common Stock held by holders who have perfected their
dissenters' rights under the MBCA (see "The Merger-- Rights of Dissenting AVECOR
Shareholders"), will be automatically converted into the right to receive the
portion of a share (the "Conversion Fraction") of Medtronic Common Stock equal
to $11.125 divided by the average of the daily closing sale prices of Medtronic
Common Stock as reported on the NYSE Composite Tape (the "Average Stock Price")
for the 18 consecutive trading days ending on the second trading day immediately
preceding the Effective Time.
 
    The $11.125 amount per share of AVECOR Common Stock, payable in shares of
Medtronic Common Stock as described above, shall be reduced proportionately if
the sum of the number of shares of AVECOR Common Stock outstanding at the
Effective Time plus the number of shares subject to then outstanding options,
warrants, or other rights to acquire shares of AVECOR Common Stock
(collectively, "Stock Rights") at the Effective Time exceeds 8,879,725 (the
number of AVECOR shares, and options to purchase such shares, outstanding on the
date the Merger Agreement was signed) plus the number of shares issuable
pursuant to the offering period in process as of the date of the Merger
Agreement under AVECOR's Employee Stock Purchase Plan, or if the aggregate
exercise price of all Stock Rights then outstanding is less than the aggregate
exercise price reflected in the Merger Agreement. AVECOR does not anticipate
that any such adjustment will be required.
 
    If, prior to the Effective Time, Medtronic recapitalizes, splits, or
combines the Medtronic Common Stock or pays a stock dividend or other stock
distribution in shares of Medtronic Common Stock, then the Conversion Fraction
will be appropriately adjusted.
 
   
    Based on the number of shares of AVECOR Common Stock outstanding on the
Record Date (assuming a Conversion Fraction of .1980, or one Medtronic share for
every 5.05 AVECOR shares, calculated by using the September 21, 1998 Medtronic
closing sale price of $56.1875 as the assumed Average Stock Price solely for
illustrative purposes of this paragraph), an estimated 1,595,085 shares of
Medtronic Common Stock will be issued in exchange for AVECOR Common Stock upon
consummation of the Merger. Such shares would represent less than 1% of the
shares of Medtronic Common Stock that would be outstanding after consummation of
the Merger.
    
 
    Medtronic intends to purchase, on the open market, a number of its shares
equivalent to the number of shares to be issued as a result of the Merger.
 
    AVECOR shareholders should understand that shareholders receiving Medtronic
Common Stock in the Merger will receive a number of Medtronic shares determined
pursuant to the Conversion Fraction, as defined at the beginning of this
section. Because the market price of Medtronic Common Stock is subject to
fluctuation, the market value of the Medtronic shares that AVECOR shareholders
receive in the Merger (whether measured at the Effective Time of the Merger or
another date) may be less than or greater than the Average Stock Price used for
purposes of determining the Conversion Fraction. In addition, because of such
fluctuations in the value of Medtronic shares, the market value of the Medtronic
Common Stock that AVECOR shareholders receive in the Merger may increase or
decrease following the Merger. See "Comparative Stock Prices and Dividends" for
information regarding the historical market prices of Medtronic Common Stock.
 
                                       29
<PAGE>
    FRACTIONAL SHARES
 
    No certificates or scrip representing fractional shares of Medtronic Common
Stock will be issued, and no Medtronic dividend, stock split, or interest will
relate to any fractional share. No fractional share interests will entitle the
owner thereof to vote or to any rights of a shareholder of Medtronic. All
fractional shares of Medtronic Common Stock to which a holder of AVECOR Common
Stock immediately prior to the Effective Time would otherwise be entitled, at
the Effective Time, shall be aggregated if and to the extent multiple AVECOR
stock certificates of such holder are submitted together to Norwest Bank
Minnesota, N.A., the exchange agent for the Merger (the "Exchange Agent"). If a
fractional share results from such aggregation, then, in lieu of any such
fractional share, each holder of AVECOR Common Stock who otherwise would be
entitled to receive a fractional share of Medtronic Common Stock in the Merger
will receive an amount of cash (without interest) determined by multiplying (i)
the Average Stock Price by (ii) the fractional share interest of Medtronic
Common Stock to which such holder would otherwise be entitled.
 
    EXCHANGE OF SHARES OF AVECOR COMMON STOCK
 
    As soon as practicable after the Effective Time, the Exchange Agent will
mail a letter of transmittal to holders of a certificate or certificates that
prior to the Effective Time represented outstanding shares of AVECOR Common
Stock. The letter of transmittal will include instructions regarding the
surrender of certificates representing shares of AVECOR Common Stock in exchange
for certificates representing shares of Medtronic Common Stock.
 
    As soon as practicable after the Effective Time, the Exchange Agent will
distribute to holders of shares of AVECOR Common Stock, upon surrender to the
Exchange Agent of one or more certificates for such shares of AVECOR Common
Stock for cancellation, together with a duly-executed letter of transmittal, (i)
one or more certificates representing the number of whole shares of Medtronic
Common Stock into which the shares represented by the certificate(s) have been
converted and (ii) a check in the amount of any cash in lieu of fractional
shares. Holders of AVECOR Common Stock will not be entitled to receive interest
on any cash to be received in the Merger.
 
    After the Effective Time, certificates representing shares of AVECOR Common
Stock converted into Medtronic Common Stock in the Merger will be deemed for all
purposes to evidence ownership of the shares of Medtronic Common Stock into
which they were converted. Holders of AVECOR Common Stock will be entitled to
any dividends that become payable to persons who are holders of record of
Medtronic Common Stock as of a record date on or after the Effective Time, but
only after they have surrendered their certificates representing shares of
AVECOR Common Stock for exchange. Any such dividends will be remitted to each
AVECOR shareholder entitled thereto, without interest, at the time that such
certificates representing shares of AVECOR Common Stock are surrendered for
exchange, subject to any applicable abandoned property, escheat, or similar law.
Holders of AVECOR Common Stock will not be entitled, however, to dividends that
become payable before or after the Effective Time to persons who were holders of
record of Medtronic Common Stock as of a record date prior to the Effective
Time.
 
SHAREHOLDER RIGHTS PLANS
 
    Medtronic will not become an Acquiring Person and the Merger will not cause
a Distribution Date under AVECOR's Rights Agreement, as amended, as such terms
are defined therein. Further, pursuant to an amendment to the AVECOR Rights
Agreement adopted on August 21, 1998, Medtronic will not be declared an Adverse
Person under the AVECOR Rights Agreement because of Medtronic's beneficial
ownership of AVECOR Common Stock resulting from the Stock Option Agreement and
the voting agreements entered into with officers and directors of AVECOR.
 
    Under the terms of the AVECOR Rights Agreement, each outstanding AVECOR
Right (as defined therein) will expire automatically pursuant to the terms of
the AVECOR Rights Agreement upon
 
                                       30
<PAGE>
consummation of the Merger and without any action on the part of AVECOR
shareholders. No additional consideration will be paid to AVECOR shareholders in
connection with the expiration of the AVECOR Rights as a result of the Merger.
 
    Each AVECOR shareholder entitled to receive shares of Medtronic Common Stock
in connection with the Merger or upon exercise of AVECOR options will receive,
together with each share of Medtronic Common Stock, one Medtronic Preferred
Stock Purchase Right pursuant to the Medtronic Shareholder Rights Plan,
represented by the certificate representing the share of Medtronic Common Stock.
See "Comparative Rights of Medtronic and AVECOR Shareholders--Shareholder Rights
Plans."
 
TREATMENT OF STOCK OPTIONS
 
    Under the terms of the outstanding options to purchase shares of AVECOR
Common Stock, any such options not otherwise vested will become fully vested and
exercisable at the Effective Time as a result of the Merger. All such options
that are not exercised and remain outstanding at the Effective Time will be
assumed by Medtronic and, following the Effective Time, will be exercisable upon
the same terms and conditions as such options were exercisable prior to the
Merger, except that the exercise price and the number of shares of Medtronic
Common Stock that can be purchased upon exercise of the options will be revised
to reflect conversion of the options on the same basis as shares of AVECOR
Common Stock are converted into shares of Medtronic Common Stock in the Merger.
As promptly as practicable after the Effective Time, Medtronic will provide to
each holder of an AVECOR option a written statement informing such holder of the
assumption by Medtronic of such option.
 
CONDUCT OF BUSINESS OF AVECOR PENDING THE MERGER
 
    AVECOR has agreed that, prior to consummation of the Merger, unless
Medtronic agrees otherwise, it will conduct its business only in the ordinary
course, it will use all reasonable efforts to preserve intact its business
organization and relationships with third parties, and it will not: declare or
pay any dividends or other distributions; amend or alter any material term of
its securities; incur, assume or guarantee any indebtedness other than in the
ordinary course of business; create, assume, or incur any lien on any material
asset; issue or repurchase any securities (other than issuances of securities
upon the exercise of stock options and other rights previously granted); alter
its accounting principles; increase the compensation or benefits of any of its
directors, officers, or other employees (except under existing agreements or in
the ordinary course of business); amend its Articles of Incorporation or Bylaws;
sell any property, pay any liabilities, or waive any claims, except in the
ordinary course of business; make capital investments in any other company;
purchase fixed assets exceeding a specified aggregate purchase price; distribute
mass communications to any group without allowing Medtronic to comment on them;
merge or consolidate with any person; acquire the stock or assets of any
business; take or fail to take any action that would cause its representations
and warranties in the Merger Agreement to be inaccurate; enter into or make any
material change in any material agreements, except in the ordinary course and
consistent with past practice; institute, settle, or compromise any claim or
suit involving amounts in excess of a specified amount; knowingly take any
action that would jeopardize the treatment of the Merger as a tax-free
transaction; or agree or commit to do any of the foregoing.
 
    AVECOR has agreed that (except as is required by the fiduciary duties of
AVECOR's directors and officers as so advised by independent counsel) neither
AVECOR nor any of its representatives or affiliates will, directly or
indirectly, solicit, initiate, or encourage any alternative proposal, or engage
in any negotiations with, or provide any information to, any person, entity, or
group (other than Medtronic) that has made or may make an alternative proposal
with respect to AVECOR or any subsidiary (except that AVECOR may inform any
third party who contacts AVECOR on an unsolicited basis concerning any
alternative proposal that AVECOR is obligated under the Merger Agreement to
disclose such solicitation to Medtronic). For these purposes, an "alternative
proposal" would include a proposal involving a merger or consolidation, a sale,
lease, or licensing of any significant portion of the assets, or a sale of
shares of
 
                                       31
<PAGE>
capital stock of AVECOR or any subsidiary. AVECOR has agreed that it will notify
Medtronic promptly, and prior to furnishing information or entering into
discussions or negotiations with a third party, regarding the terms of any such
proposal that AVECOR may receive.
 
    Pursuant to the Merger Agreement and a confidentiality agreement between
Medtronic and AVECOR, AVECOR has agreed to give Medtronic and its
representatives access to AVECOR's offices, properties, books, and records, and
to furnish to Medtronic and its representatives such financial and operating
data and other information as Medtronic may reasonably request, and will have
its employees and representatives cooperate with Medtronic in Medtronic's
investigation of the business of AVECOR.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
    In considering the recommendation of the Board of Directors of AVECOR with
respect to the Plan of Merger, the Merger Agreement, and the transactions
contemplated thereby, shareholders of AVECOR should be aware that certain
members of the management and Board of Directors of AVECOR have certain
interests in the Merger that are in addition to, and may be in conflict with,
the interests of shareholders of AVECOR generally.
 
    STOCK OPTIONS.  Under the terms of the outstanding options to purchase
shares of AVECOR Common Stock, any such options that are not otherwise vested
will become fully vested and exercisable at the Effective Time as a result of
the Merger. AVECOR's executive officers and directors collectively hold
outstanding options to purchase 407,000 shares of AVECOR Common Stock, of which
options to purchase an aggregate 297,750 shares will vest as a result of the
Merger. The following executive officers and directors hold the following number
of options that will become vested as a result of the Merger: Anthony Badolato,
50,000; Gregory Melsen, 86,250; Allan Seck, 30,000; William Haworth, 76,000;
Edward Strickland, 18,500; David Stassen, 18,500; and Gordon Wright, 18,500. See
"--Treatment of Stock Options."
 
    NONCOMPETITION AGREEMENTS.  Simultaneously with or immediately following the
execution of the Merger Agreement, Messrs. Badolato and Seck executed separate
noncompetition agreements with Medtronic. AVECOR, pursuant to the Merger
Agreement, has agreed to use all reasonable efforts to cause Messrs. Melsen,
Haworth and Bradley Goskowicz to execute proposed noncompetition agreements with
Medtronic. Each of the executed and proposed noncompetition agreements is
expressly contingent upon the effectiveness of the Merger. Pursuant to these
noncompetition agreements, the individual executing the agreement agrees that
such individual will not be employed by, associated with, or render services to
any person or entity (other than AVECOR or another Medtronic affiliate) engaged
in the design, development, manufacture, marketing, or sale of products that are
similar to current or planned products of AVECOR anywhere in the world. The
noncompetition agreements executed by Messrs. Badolato and Seck expire 42 months
after the Effective Time, and the other noncompetition agreements will expire 24
months after the Effective Time, if executed as proposed.
 
    CHANGE IN CONTROL AGREEMENTS.  On April 29, 1996, AVECOR entered into change
in control agreements with four executive officers (Messrs. Badolato, Melsen,
Seck, and Haworth) and other employees. The agreements provide certain payments
and benefits to these individuals in the event that, during the 12-month period
following a "change in control" of AVECOR, (i) such individual's employment is
terminated by AVECOR or its successors for any reason other than for death,
disability, retirement, or "cause" or (ii) such individual terminates his
employment for "good reason," which includes certain material adverse changes in
the executive's status, position, base salary, benefits, or work location. The
executive will be paid, in that event, a lump sum cash payment equal to 24 times
the executive's highest monthly compensation for any 12-month period during the
prior 36 months. The terminated executive will also be entitled to continue to
receive coverage under AVECOR's benefit plans for 24 months. Consummation of the
Merger will constitute the occurrence of a "change in control" under the change
in control agreements.
 
                                       32
<PAGE>
    INDEMNIFICATION.  Medtronic has agreed to provide to the individuals who
have served as officers and directors of AVECOR, for at least six years after
the Merger (or until any matters arising prior to the Merger have been
resolved), indemnification equivalent to that provided by the Second Restated
Articles of Incorporation, as amended, and Bylaws of AVECOR prior to the
Effective Time. Medtronic has also agreed to provide, for six years, officers'
and directors' liability insurance coverage comparable to that currently
provided by AVECOR with respect to acts occurring prior to the Effective Time.
See "--Indemnification."
 
    Each of Messrs. Badolato, Strickland, Stassen, and Wright participated in
the discussions and deliberations of the AVECOR Board of Directors in connection
with the Merger, and each of them voted in favor of the Merger. Messrs. Melsen,
Seck, and Haworth participated in such discussions but are not Board members.
 
VOTING AGREEMENTS
 
   
    Pursuant to agreements to facilitate merger between Medtronic and each of
the executive officers and directors of AVECOR (Messrs. Badolato, Seck, Melsen,
Haworth, Strickland, Stassen, and Wright), such individuals have agreed to vote
shares of AVECOR Common Stock owned by them as of the date of the Merger
Agreement (i) in favor of the approval, consent, and ratification of the Merger
and (ii) against any action that would impede, interfere with, or discourage the
Merger, would facilitate an acquisition of AVECOR in any manner by a party
(other than Medtronic), or would result in any breach of any representation,
warranty, covenant, or agreement of AVECOR under the Merger Agreement. These
voting agreements terminate upon termination of the Merger Agreement by
Medtronic. As of the Record Date, the shareholders who executed the voting
agreements owned an aggregate 1,084,524 shares of AVECOR Common Stock,
representing approximately 13.5% of the AVECOR Common Stock outstanding on the
Record Date.
    
 
STOCK OPTION AGREEMENT
 
    Simultaneously with the execution of the Merger Agreement, AVECOR and
Medtronic entered into a Stock Option Agreement pursuant to which AVECOR granted
to Medtronic an option, exercisable only under certain specified circumstances,
to purchase a number of shares of AVECOR Common Stock equal to an aggregate
19.9% of the shares of AVECOR Common Stock outstanding on the date of the Merger
Agreement, or 1,600,851 such shares, at an exercise price of $11.125 per share.
The specified circumstances under which the stock option becomes exercisable are
the same as those that could result in the payment by AVECOR of a termination
fee upon certain events triggering termination of the Merger Agreement. See "The
Merger--Amendment and Termination of the Merger Agreement."
 
    Under the Stock Option Agreement, Medtronic also has the right, under
certain circumstances following the occurrence of specified proposals by third
parties to acquire stock or assets of AVECOR or to merge or combine with AVECOR,
and in lieu of exercising Medtronic's option, to require AVECOR to pay to
Medtronic, in cancellation of Medtronic's option, the in-the-money value of such
option. Such value is calculated as the lesser of (i) $2.75 million or (ii) the
number of shares subject to Medtronic's option multiplied by the excess of the
then-current trading price of AVECOR Common Stock or the price per share offered
in the third-party proposal, whichever is greater, over $11.125. In no event,
however, can the sum of such cancellation amount and the $2.75 million
termination fee under the Merger Agreement, if then payable, exceed $3.6
million. See "--Amendment and Termination of the Merger Agreement."
 
CONDITIONS; WAIVER
 
    The respective obligations of Medtronic, Merger Subsidiary, and AVECOR to
effect the Merger are subject to the satisfaction at or prior to the Merger of
certain conditions, including, among others: (a) the approval by the AVECOR
shareholders of the Merger; (b) the effectiveness of the Registration Statement;
 
                                       33
<PAGE>
   
(c) the expiration or termination of the waiting periods applicable to the
consummation of the Merger under the HSR Act and any foreign merger laws; (d)
the shares of Medtronic Common Stock issuable in the Merger having been duly
authorized for listing by the NYSE, subject to official notice of issuance; and
(e) the absence of an order, decree, or injunction by any federal or state court
or other governmental body, agency, or official that would prevent or materially
delay consummation of the Merger. See "The Merger--Regulatory Requirements."
    
 
    In addition, the obligations of AVECOR to effect the Merger are subject to
the satisfaction at or prior to the Merger of certain conditions, including
that: (a) Medtronic and Merger Subsidiary have performed in all material
respects their obligations under the Merger Agreement required to be performed
by them; (b) each representation and warranty of Medtronic contained in the
Merger Agreement is true in all material respects as of the Effective Time; and
(c) AVECOR has received an opinion of Oppenheimer Wolff & Donnelly LLP, to the
effect that the Merger will constitute a "tax-free" reorganization for federal
income tax purposes. See "The Merger--Certain Federal Income Tax Consequences."
 
    In addition, the obligations of Medtronic and Merger Subsidiary to effect
the Merger are subject to the satisfaction at or prior to the Merger of certain
conditions, including that: (a) AVECOR has performed in all material respects
its obligations under the Merger Agreement required to be performed by it; (b)
each representation and warranty of AVECOR contained in the Merger Agreement is
true in all material respects as of the Effective Time; (c) all necessary
consents have been received; (d) Medtronic has received written resignations
from each of the directors and specified officers of AVECOR specified by
Medtronic effective as of the Effective Time; and (e) Anthony Badolato has
agreed to continue his employment with AVECOR following the Merger.
 
AMENDMENT AND TERMINATION OF THE MERGER AGREEMENT
 
    Any of the provisions of the Merger Agreement may be amended by written
agreement of the respective parties at any time before or after approval of the
Merger by the AVECOR shareholders; however, after such approval, no amendment
may be made to the Plan of Merger attached hereto as Appendix A that materially
affects the rights of the AVECOR shareholders without shareholder approval.
 
    The Merger Agreement may be terminated and the Merger abandoned at any time
prior to the Effective Time, whether before or after approval of the Merger by
the AVECOR shareholders, only as follows:
 
        (a) By mutual consent of the Board of Directors of each of Medtronic and
    AVECOR;
 
        (b) By either Medtronic or AVECOR if the Merger has not been effected by
    January 12, 1999, except that a party cannot terminate the Merger Agreement
    if its own breach of the Merger Agreement is the primary cause of, or
    results in, the Merger not being effected by such date, and except that such
    date can be extended by 90 days if the applicable governmental authorities
    make requests for additional information under the HSR Act or foreign merger
    laws;
 
        (c) By either Medtronic or AVECOR if a court or other governmental
    authority has issued a final, nonappealable order, decree, or ruling that
    permanently enjoins or prohibits the Merger;
 
        (d) By either Medtronic or AVECOR if the AVECOR shareholders do not vote
    to approve the Merger, except that a party cannot terminate the Merger
    Agreement if its own failure to perform under the Merger Agreement is the
    primary cause of, or results in, the failure of the AVECOR shareholders to
    approve the Merger;
 
        (e) By Medtronic if AVECOR has solicited, entertained, or negotiated a
    competing offer to acquire AVECOR in violation of the Merger Agreement, or
    recommended, approved, or entered into an agreement regarding any such
    offer, or withdrawn or modified (in a manner adverse to Medtronic) its
    recommendation of the Merger, or if a tender or exchange offer for 15% or
    more of the AVECOR
 
                                       34
<PAGE>
    Common Stock is commenced and the AVECOR Board, within 10 business days
    thereafter, fails to recommend against acceptance or takes no position
    regarding acceptance of the offer;
 
        (f) By AVECOR if it is not in material breach of its obligations under
    the Merger Agreement and its Board of Directors has accepted a competing
    offer by a party other than Medtronic to acquire AVECOR, and has paid to
    Medtronic the termination fee described below;
 
        (g) By Medtronic if it is not then in material breach and there occurs a
    material breach of any representation, warranty, or obligation under the
    Merger Agreement on the part of AVECOR, or by an affiliate of AVECOR under
    such person's affiliate's letter, or by an officer or director of AVECOR
    under his voting agreement, that cannot be cured within 30 days; or
 
        (h) By AVECOR if it is not then in material breach and there occurs a
    material breach of any representation, warranty, or obligation under the
    Merger Agreement on the part of Medtronic that cannot be cured within 30
    days.
 
    AVECOR has agreed to pay Medtronic $2.75 million if either (i) the Merger
Agreement is terminated as described in paragraph (e) or (f) above or (ii) a
third party either makes an alternative proposal to which AVECOR responds or in
fact acquires 15% or more of the outstanding AVECOR Common Stock prior to the
Meeting, and either (A) the AVECOR shareholders do not approve the Merger or (B)
the Merger Agreement is terminated pursuant to either paragraph (g) above (where
AVECOR's breach is willful and intentional) or paragraph (d) above.
 
EXPENSES AND FEES
 
    Whether or not the Merger is consummated, all out-of-pocket expenses
incurred in connection with the Merger (including but not limited to accounting
and legal fees) and the transactions contemplated thereby will be paid by the
party incurring such costs and expenses, except that Medtronic and AVECOR will
share equally all expenses related to printing and mailing the Registration
Statement and this Proxy Statement/Prospectus and the filing fees required under
the HSR Act and any foreign merger laws.
 
RESTRICTIONS ON RESALE OF MEDTRONIC COMMON STOCK
 
    The Medtronic Common Stock issuable in connection with the Merger has been
registered under the Securities Act and will be freely transferable by the
recipients, except that this registration does not cover resales by shareholders
of AVECOR who may be deemed to control or be under common control with AVECOR at
the time of the Meeting ("Affiliates"). Affiliates may not sell their shares of
Medtronic Common Stock acquired in connection with the Merger except pursuant to
an effective registration statement under the Securities Act covering such
shares, or in compliance with Rule 145 under the Securities Act or another
applicable exemption from the registration requirements of the Securities Act.
AVECOR has delivered to Medtronic, and agreed to update as necessary, a list
identifying all persons who, in AVECOR's opinion, upon advice of counsel, are
Affiliates of AVECOR for purposes of Rule 145. AVECOR has delivered to Medtronic
from each person already identified as an Affiliate, and has agreed to use all
reasonable efforts to cause each person who is subsequently identified as an
Affiliate to deliver to Medtronic at or prior to the Effective Time, an
agreement that such persons (i) will not offer to sell, sell, or otherwise
dispose of any shares of Medtronic Common Stock received in the Merger in
violation of the Securities Act, and (ii) have no present intention to sell,
transfer, or otherwise dispose of any of the Medtronic Common Stock received in
the Merger. It is expected that Affiliates will be able to sell such shares
without registration and in accordance with the volume, manner of sale, and
other applicable limitations of the Securities Act and the rules and regulations
of the Commission thereunder.
 
   
    It is estimated that Affiliates of AVECOR will receive a maximum of
approximately 294,575 shares of Medtronic Common Stock upon consummation of the
Merger (assuming full exercise of all outstanding AVECOR options held by such
Affiliates and assuming a Conversion Fraction of .1980). Such shares
    
 
                                       35
<PAGE>
   
would constitute less than 1% of the total number of shares of Medtronic Common
Stock anticipated to be outstanding immediately after the Effective Time after
giving effect to the shares issued pursuant to the Merger. Solely for
illustrative purposes of the foregoing estimate, the Conversion Fraction was
calculated by using the September 21, 1998 Medtronic closing sale price of
$56.1875 as the assumed Average Stock Price. See "The Merger--Conversion of
AVECOR Common Stock in the Merger."
    
 
DEREGISTRATION OF AVECOR COMMON STOCK
 
    If the Merger is consummated, the AVECOR Common Stock will cease to be
quoted on the Nasdaq National Market, and Medtronic will apply to the Commission
for the deregistration of AVECOR Common Stock under the Exchange Act.
 
ACCOUNTING TREATMENT OF THE MERGER
 
    Medtronic intends to account for the Merger as a purchase for accounting and
financial reporting purposes under generally accepted accounting principles.
Under the purchase method, AVECOR's results of operations will be included in
Medtronic's consolidated results of operations from and after the Effective
Time. For purposes of preparing Medtronic's consolidated financial statements,
Medtronic will establish a new accounting basis for AVECOR's identifiable
tangible and intangible assets and liabilities based upon the fair values
thereof, and record goodwill for the difference between Medtronic's purchase
price, including the direct costs of acquisition, and the fair value of AVECOR's
identifiable tangible and intangible net assets. A final determination of
required purchase accounting adjustments and of the fair value of the assets and
liabilities of AVECOR has not yet been made. Accordingly, the purchase
accounting adjustments made in connection with the development of the
comparative pro forma per share financial information appearing elsewhere in
this Proxy Statement/Prospectus are preliminary and subject to change. Using the
purchase method to account of the Merger would not materially affect Medtronic's
cash flow or the results of operations on a continuing basis based on current
and anticipated profitability levels.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The following is a discussion of certain material United States federal
income tax considerations in connection with the Merger. This discussion merely
summarizes certain principal United States federal income tax consequences of
the Merger and does not purport to be a complete analysis of all of the
potential tax effects relevant to the Merger. In this regard, this discussion
does not deal with all federal income tax considerations that may be relevant to
certain AVECOR shareholders in light of their particular circumstances, such as
dealers in securities, insurance companies, shareholders who do not hold their
AVECOR Common Stock as capital assets, foreign persons, tax-exempt entities, or
persons who are subject to the alternative minimum tax provisions of the Code.
Furthermore, it does not address (i) the tax consequences to AVECOR shareholders
who acquired their shares in connection with stock options or stock purchase
plans or in other compensatory transactions, or (ii) the acceleration of vesting
periods and/ or assumption by Medtronic of outstanding options to purchase
shares of AVECOR Common Stock pursuant to the Merger. See "The Merger--Treatment
of Stock Options," and "--Interests of Certain Persons in the Merger." Moreover,
it does not address the tax consequences of the Merger under foreign, state, or
local tax laws.
 
    AVECOR SHAREHOLDERS ARE URGED TO CONSULT THEIR OWN TAX ADVISORS AS TO THE
CONSEQUENCES OF THE MERGER, INCLUDING THE APPLICABLE FEDERAL, STATE, LOCAL, AND
FOREIGN TAX CONSEQUENCES TO THEM.
 
    Oppenheimer Wolff & Donnelly LLP, counsel to AVECOR, will render at closing
an opinion (the "Tax Opinion") that the Merger constitutes a reorganization
under Section 368 of the Code. Neither AVECOR nor Medtronic will request a
ruling from the Internal Revenue Service (the "IRS") with regard to any of the
United States federal income tax consequences of the Merger. The Tax Opinion is
based on
 
                                       36
<PAGE>
and subject to certain assumptions and limitations as well as factual
representations received from AVECOR and Medtronic, as discussed below. An
opinion of counsel represents only counsel's best legal judgment and has no
binding effect or official status of any kind, and no assurance can be given
that contrary positions may not be taken by the IRS or a court considering the
issues.
 
    Subject to the accuracy of representations contained in certain certificates
received from AVECOR and Medtronic, it is the opinion of Oppenheimer Wolff &
Donnelly LLP that the material United States federal income tax consequences of
the Merger are as follows:
 
    NATURE OF THE MERGER.  The Merger will constitute a reorganization as
defined in Section 368(a)(1)(A) of the Code by application of Section
368(a)(2)(E) of the Code, and AVECOR, Medtronic, and Merger Subsidiary will each
be "a party to a reorganization" within the meaning of Section 368(b) of the
Code if the Merger is carried out in the manner set forth in the Merger
Agreement.
 
    CONSEQUENCES TO AVECOR.  AVECOR will not recognize gain or loss upon
Medtronic's issuance of Medtronic Common Stock to the AVECOR shareholders in the
Merger and the transfer by operation of law of Merger Subsidiary's assets and
liabilities to AVECOR upon consummation of the Merger.
 
    CONSEQUENCES TO AVECOR'S SHAREHOLDERS.  No gain or loss will be recognized
by AVECOR's shareholders upon their receipt in the Merger of Medtronic Common
Stock, except to the extent of cash received in lieu of a fractional share of
Medtronic Common Stock.
 
    The aggregate tax basis of Medtronic Common Stock received by an AVECOR
shareholder in the Merger (including any fractional share deemed received) will
be the same as the aggregate tax basis of the AVECOR Common Stock surrendered in
exchange therefor.
 
    The holding period of each share of Medtronic Common Stock received by each
of AVECOR's shareholders in the Merger will include the period during which such
AVECOR shareholder held his or her AVECOR Common Stock surrendered in exchange
therefor, provided that the AVECOR Common Stock is held as a capital asset at
the time of the Merger.
 
    Cash payments in lieu of a fractional share should be treated as if a
fractional share of Medtronic Common Stock had been issued in the Merger and
then redeemed by Medtronic. An AVECOR shareholder receiving such cash should
generally recognize capital gain or loss upon such payment equal to the
difference (if any) between the amount of cash received and such shareholder's
basis in the fractional share that is being treated as redeemed (which will be a
pro rata portion of the shareholder's basis in the Medtronic Common Stock
received in the Merger (including any fractional share deemed received)).
 
    An AVECOR shareholder who receives solely cash for his or her AVECOR Common
Stock pursuant to the exercise of dissenters' rights will be obligated to report
(i) either capital gain or loss equal to the difference between the cash
received by such shareholder and such shareholder's basis in his or her AVECOR
Common Stock, if the shareholder held his or her AVECOR Common Stock as a
capital asset on the date of the Merger, or (ii) dividend income, depending on
whether the deemed redemption resulting from the exercise of dissenters' rights
qualifies for sale or exchange treatment under the tests set forth in Section
302(b) of the Code. Under those tests, most AVECOR shareholders who exercise
their dissenters' rights should receive capital gain or loss treatment (rather
than dividend treatment), if the deemed redemption of their AVECOR Common Stock
constitutes a "complete redemption" of their interests in AVECOR (and Medtronic,
after the Merger). To the extent that persons related to any such shareholder
continue to hold stock in Medtronic after the Merger, the rules of Section 318
of the Code may require dividend treatment unless Section 302(c) of the Code
permits those rules to be waived in a particular instance.
 
    LIMITATIONS ON OPINION AND DISCUSSION.  As noted above, the Tax Opinion is
subject to certain assumptions, including, but not limited to, the truth and
accuracy of certain representations made by AVECOR and Medtronic. Furthermore,
the Tax Opinion will not bind the IRS and the IRS is, therefore,
 
                                       37
<PAGE>
not precluded from asserting a contrary position. The Tax Opinion and this
discussion are based on currently existing provisions of the Code, existing and
proposed Treasury regulations, and current administrative rulings and court
decisions. There can be no assurance that future legislative, judicial, or
administrative changes or interpretations will not adversely affect the accuracy
of the Tax Opinion or of statements and conclusions set forth herein. Any such
changes or interpretations could be applied retroactively and could affect the
tax consequences of the Merger.
 
INDEMNIFICATION
 
    Under the Merger Agreement, Medtronic has agreed to continue to indemnify
the present and former officers and directors of AVECOR for a period of at least
six years following the Merger with respect to acts or omissions occurring prior
to the Effective Time, to the extent that they are currently indemnified under
AVECOR's Articles of Incorporation and Bylaws as of the date of the Merger
Agreement. Medtronic has also agreed to provide directors' and officers'
liability insurance coverage, comparable to that currently maintained by AVECOR,
for six years after the Effective Time. See "The Merger--Interests of Certain
Persons in the Merger."
 
REGULATORY REQUIREMENTS
 
   
    Under the HSR Act, certain acquisition transactions, including the Merger,
cannot be consummated unless certain information has been furnished to the
Federal Trade Commission ("FTC") and the Antitrust Division of the United States
Department of Justice and certain waiting period requirements have been
satisfied. Medtronic and AVECOR each furnished such information on July 22,
1998. Pursuant to the HSR Act, the Merger may not be consummated until the
expiration of at least 30 days following the receipt of each filing, unless the
waiting period is earlier terminated by the FTC and the Antitrust Division. On
August 21, 1998, Medtronic and AVECOR received a request for additional
information relating to the notifications that they had earlier filed under the
HSR Act. This request extends the waiting period during which the FTC and the
Antitrust Division can review the Merger. The waiting period will expire on the
20th day after the companies substantially comply with the request. The
companies have discussed and clarified the request with the governmental
authorities and expect to file shortly their response.
    
 
    The Antitrust Division of the United States Department of Justice and the
FTC frequently scrutinize the legality under the antitrust laws of transactions
such as the Merger. At any time before or after the consummation of the Merger,
the Antitrust Division or the FTC could take such action under the antitrust
laws as it deems necessary or desirable in the public interest, including
seeking to enjoin the consummation of the Merger or seeking the divestiture of
substantial assets of AVECOR or Medtronic. AVECOR and Medtronic believe that the
Merger will not violate the antitrust laws. There can be no assurance, however,
that a challenge to the Merger on antitrust grounds will not be made or, if such
a challenge is made, what the results will be.
 
    Due to the international scope of Medtronic's and AVECOR's businesses,
regulatory filings may also be required in certain European and other
jurisdictions. Medtronic and AVECOR are in the process of determining whether
any such filings will be required, but they do not expect any such filings to
affect the expected timing of the Merger.
 
    Other than as described herein, the Merger does not require the approval of
any federal, state, or other agency. See "The Merger--Conditions; Waiver."
 
RIGHTS OF DISSENTING AVECOR SHAREHOLDERS
 
    If the Merger occurs, AVECOR shareholders are entitled to dissenters' rights
under Sections 302A.471 and 302A.473 of the MBCA in connection with the Merger.
Medtronic shareholders are not entitled to dissenters' rights in connection with
the Merger.
 
                                       38
<PAGE>
    THE FOLLOWING DISCUSSION IS NOT A COMPLETE STATEMENT OF THE LAW PERTAINING
TO DISSENTERS' RIGHTS UNDER THE MBCA AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO THE FULL TEXT OF SECTIONS 302A.471 AND 302A.473 OF THE MBCA, COPIES
OF WHICH ARE ATTACHED TO THIS TO THIS PROXY STATEMENT/PROSPECTUS AS APPENDIX C.
Any shareholder of AVECOR who wishes to exercise, or to preserve his or her
right to exercise, dissenters' rights should review the following discussion and
Appendix C carefully, because failure to timely and properly comply with the
specified procedures will result in the loss of dissenters' rights under the
MBCA.
 
    In accordance with Sections 302A.471 and 302A.473 of the MBCA, AVECOR
shareholders have the right to dissent with respect to the Merger and, subject
to certain conditions, to be paid in cash the "fair value" of their AVECOR
shares. In this context, the term "fair value" means the value of the AVECOR
shares immediately before the Effective Time of the Merger. Under Section
302A.473, where a merger is to be submitted for approval at a meeting of
shareholders, the corporation must notify each of its shareholders of the right
to dissent, include in such notice a copy of Sections 302A.471 and 302A.473 and
provide a brief description of the procedures to be followed under these
sections. This Proxy Statement/ Prospectus constitutes such notice to the
shareholders of AVECOR, and the following discussion describes the procedures to
be followed by a dissenting shareholder.
 
    A shareholder of AVECOR wishing to exercise the right to demand the fair
value of his or her shares must:
 
    - BEFORE THE VOTE OF SHAREHOLDERS IS TAKEN AT THE MEETING, FILE WITH AVECOR
      A WRITTEN NOTICE OF INTENT TO DEMAND THE FAIR VALUE OF HIS OR HER SHARES
      AND, IN ADDITION, HE OR SHE MUST NOT VOTE IN FAVOR OF THE MERGER. Because
      a proxy that does not contain voting instructions will, unless revoked, be
      voted FOR approval of the Merger, a shareholder of AVECOR who votes by
      proxy and who wishes to exercise dissenters' rights must (i) vote AGAINST
      the approval of the Merger, or (ii) ABSTAIN from voting on the approval of
      the Merger. A vote against the Merger in person or by proxy will not in
      and of itself constitute a written notice of intent to demand the fair
      value of a shareholder's AVECOR shares satisfying the requirements of the
      MBCA.
 
    - A DEMAND FOR FAIR VALUE MUST BE EXECUTED BY OR FOR THE SHAREHOLDER OF
      RECORD AS SUCH SHAREHOLDER'S NAME APPEARS ON HIS OR HER AVECOR STOCK
      CERTIFICATE OR CERTIFICATES. If the AVECOR stock is owned of record in a
      fiduciary capacity such as by a trustee, guardian or custodian, such
      demand must be executed by the fiduciary. If the stock is owned of record
      by more than one person, as in a joint tenancy or tenancy in common, such
      demand must be executed by all joint owners. An authorized agent,
      including an agent for two or more joint owners, may execute the demand
      for a shareholder of record; however, the agent must identify the record
      owner and expressly disclose the fact that, in exercising the demand, he
      or she is acting as agent for the record owner.
 
      A record owner who holds shares of AVECOR as a nominee for others, such as
      a broker, may demand fair value of the shares held for all, or fewer than
      all of the beneficial owners of such shares. In such a case, the written
      demand should set forth the number of shares to which it relates. When no
      number of shares is expressly mentioned, the demand will be presumed to
      cover all shares standing in the name of the record owner. BENEFICIAL
      OWNERS OF AVECOR SHARES WHO ARE NOT RECORD OWNERS AND WHO INTEND TO
      EXERCISE DISSENTERS' RIGHTS SHOULD SUBMIT TO AVECOR AT OR BEFORE THE
      ASSERTION OF THE RIGHTS A WRITTEN CONSENT OF THE RECORD OWNER OR INSTRUCT
      THE RECORD OWNER TO COMPLY WITH THE STATUTORY REQUIREMENTS WITH RESPECT TO
      THE EXERCISE OF DISSENTERS' RIGHTS BEFORE THE DATE OF THE MEETING.
 
    - AVECOR shareholders who have previously filed a notice of intent to demand
      the fair value of their shares and have not voted in favor of the Merger
      may, after shareholder approval of the Merger, elect to exercise
      dissenters' rights and demand fair value by mailing or delivering their
      written demand to: Gregory Melsen, Chief Financial Officer, AVECOR
      Cardiovascular Inc., 7611
 
                                       39
<PAGE>
      Northland Drive, Minneapolis, Minnesota 55428. The written demand should
      specify the shareholder's name and mailing address, the number of shares
      owned, and that the shareholder is thereby demanding the fair value of his
      or her shares.
 
    - After the Effective Time, AVECOR, as the surviving corporation, will cause
      to be mailed to each shareholder of AVECOR who has properly asserted
      dissenters' rights a notice that contains (i) the address to which a
      demand for payment and stock certificates must be sent in order to receive
      payment and the date by which they must be received; (ii) a form to be
      used to certify the date on which the shareholder, or the beneficial owner
      on whose behalf the shareholder dissents, acquired his or her AVECOR
      shares or an interest in them and to demand payment; and (iii) another
      copy of Sections 302A.471 and 302A.473 together with a brief description
      of these sections. TO RECEIVE THE FAIR VALUE OF HIS OR HER AVECOR SHARES,
      A DISSENTING SHAREHOLDER MUST DEMAND PAYMENT AND DEPOSIT HIS OR HER
      CERTIFICATES WITHIN 30 DAYS AFTER THIS NOTICE FROM AVECOR IS GIVEN TO
      DISSENTING SHAREHOLDERS.
 
    - After the Effective Time or after AVECOR receives a valid demand for
      payment, whichever is later, AVECOR must remit to each dissenting
      shareholder who has complied with the dissenters' rights provisions the
      amount AVECOR estimates to be the fair value of the shares, plus interest,
      along with (i) AVECOR's closing balance sheet and statement of income for
      a fiscal year ending not more than 16 months before the effective date of
      the Merger, together with the latest available interim financial
      statement; (ii) an estimate by AVECOR of the fair value of the shares and
      a brief description of the method used to reach the estimate; and (iii)
      another copy of Sections 302A.471 and 302A.473 and a brief description of
      the procedure to be followed in demanding supplemental payment. If AVECOR
      fails to remit payment within 60 days of the deposit of certificates,
      AVECOR must return all deposited certificates. However, AVECOR may again
      give notice and require deposit at a later time.
 
    - IF A DISSENTING AVECOR SHAREHOLDER BELIEVES THAT THE AMOUNT REMITTED BY
      AVECOR IS LESS THAN THE FAIR VALUE OF HIS OR HER SHARES PLUS INTEREST,
      SUCH DISSENTING SHAREHOLDER MAY GIVE WRITTEN NOTICE TO AVECOR OF HIS OR
      HER OWN ESTIMATE OF THE FAIR VALUE FOR THE SHARES PLUS INTEREST AND DEMAND
      A SUPPLEMENTAL PAYMENT FOR THE DIFFERENCE. Any written demand for
      supplemental payment must be made within 30 days after AVECOR mailed its
      original remittance. Otherwise, a dissenter is entitled only to the amount
      remitted by AVECOR.
 
    - Within 60 days after receiving a demand for supplemental payment, AVECOR,
      as the surviving corporation, must either pay the amount of the
      supplemental payment demanded (or agreed to between the dissenting
      shareholder and AVECOR) or file a petition in the state courts of
      Minnesota requesting that the court determine the fair value of the shares
      plus interest. Any petition so filed must name as parties all dissenting
      shareholders who have demanded supplemental payments and who have been
      unable to reach an agreement with AVECOR concerning the fair value of
      their shares. If AVECOR files such a petition, it must serve all parties
      with a summons and a copy of the petition under the rules of civil
      procedure. The court may appoint appraisers, with such power and authority
      as the court deems proper, to receive evidence on and recommend the amount
      of fair value of the shares. The jurisdiction of the court is plenary and
      exclusive, and the fair value as determined by the court is binding on all
      shareholders, wherever located. A dissenting shareholder, if successful,
      is entitled to a judgment for the amount in cash by which the fair value
      of his or her shares as determined by the court exceeds the amount
      originally remitted by AVECOR, plus interest.
 
    Generally, the costs and expenses associated with a court proceeding to
determine the fair value of the AVECOR shares will be borne by AVECOR, as the
surviving corporation, unless the court finds that a dissenting shareholder has
demanded supplemental payment in a manner that is arbitrary, vexatious, or not
in good faith. Similar costs and expenses may also be assessed in instances
where AVECOR has failed
 
                                       40
<PAGE>
to comply with the procedures in Section 302A.473 of the MBCA pertaining to
dissenters' rights discussed above. The court may, in its discretion, award
attorneys' fees to an attorney representing dissenting shareholders out of any
amount awarded to such dissenters.
 
    FAILURE TO FOLLOW THE STEPS REQUIRED BY SECTION 302A.473 FOR ASSERTING
DISSENTERS' RIGHTS MAY RESULT IN THE LOSS OF A SHAREHOLDER'S RIGHTS TO DEMAND
THE FAIR VALUE OF HIS OR HER AVECOR SHARES. Shareholders considering seeking
appraisal should realize that the fair value of their shares, as determined
under Section 302A.473 of the MBCA in the manner outlined above, could be more
than, the same as, or less than the amount of value of the shares of Medtronic
Common Stock they would be entitled to receive as a result of the Merger if they
did not seek appraisal of their shares.
 
                     COMPARATIVE STOCK PRICES AND DIVIDENDS
 
    Medtronic Common Stock is listed and traded on the New York Stock Exchange
(symbol: MDT), and it is a condition to all parties' obligations to consummate
the Merger that the Medtronic Common Stock to be issued in the Merger be
approved for such listing. AVECOR Common Stock is traded on the Nasdaq National
Market (symbol: AVEC).
 
    The following table sets forth, for the quarters indicated, the high and low
sales prices per share of Medtronic Common Stock on the NYSE and the cash
dividends paid per share of Medtronic Common Stock. Also set forth, for the
calendar period indicated, are the high and low sales prices per share of AVECOR
Common Stock as reported by the Nasdaq National Market. The prices set forth
below for AVECOR Common Stock exclude adjustments for retail mark-ups,
mark-downs, or commissions.
 
   
<TABLE>
<CAPTION>
                                                                                               AVECOR COMMON STOCK
                                                                MEDTRONIC COMMON STOCK
                                                          -----------------------------------  --------------------
                                                             HIGH        LOW       DIVIDENDS     HIGH        LOW
                                                          ----------  ----------  -----------  ---------  ---------
<S>                                                       <C>         <C>         <C>          <C>        <C>
CALENDAR 1996
First Quarter...........................................  $  31.3125  $  22.25     $   .0325   $  17.25   $  10.50
Second Quarter..........................................  $  29.875   $  24.375    $   .0325   $  14.125  $  12.00
Third Quarter...........................................  $  32.4375  $  23.50     $   .0475   $  15.875  $  11.625
Fourth Quarter..........................................  $  34.9375  $  30.25     $   .0475   $  14.875  $  10.875
CALENDAR 1997
First Quarter...........................................  $  35.875   $  28.8125   $   .0475   $  13.375  $  10.75
Second Quarter..........................................  $  44.4375  $  30.375    $   .0475   $  12.25   $   8.75
Third Quarter...........................................  $  49.25    $  42.50     $   .055    $  12.375  $   9.875
Fourth Quarter..........................................  $  52.75    $  40.5625   $   .055    $  12.00   $   6.00
CALENDAR 1998
First Quarter...........................................  $  58.4375  $  45.4375   $   .055    $   8.00   $   5.625
Second Quarter..........................................  $  66.00    $  47.9375   $   .055    $   7.438  $   6.125
Third Quarter (through September 21)....................  $  72.75    $  51.00     $   .065    $  10.625  $   7.25
</TABLE>
    
 
    AVECOR has never paid cash dividends. Under the Merger Agreement, AVECOR has
agreed not to pay any dividends on AVECOR Common Stock prior to the Merger.
Medtronic has paid regular quarterly cash dividends on Medtronic Common Stock
since 1978. It is expected that the Board of Directors of Medtronic will
continue the practice of declaring cash dividends on a quarterly basis; however,
no assurance can be given as to the amount of future dividends, which will
necessarily be dependent on future earnings, financial requirements of Medtronic
and its subsidiaries, and other factors.
 
    In the Merger, shares of AVECOR Common Stock will be converted into shares
of Medtronic Common Stock based on the Conversion Fraction, which equals $11.125
divided by the Average Stock Price for the 18 consecutive NYSE trading days
ending on the second NYSE trading day immediately preceding the Effective Time
of the Merger. On July 10, 1998, the last trading day preceding public
 
                                       41
<PAGE>
   
announcement of the Merger, the reported closing sale price of Medtronic Common
Stock on the NYSE was $69.8125 per share, resulting in an implied Conversion
Fraction (if it were determined based on the closing sale price that day) of
0.1594. On that day, the reported closing sale price of AVECOR Common Stock on
the Nasdaq National Market was $9.875 per share. On September 21, 1998, the
latest practicable trading day prior to the printing of this Proxy
Statement/Prospectus, the closing sale price of Medtronic Common Stock on the
NYSE was $56.1875 per share, resulting in an implied Conversion Fraction (if it
were determined based on the closing sale price that day) of .1980. The reported
closing sale price of AVECOR Common Stock on the Nasdaq National Market on that
day was $9.50 per share. SHAREHOLDERS ARE URGED TO OBTAIN CURRENT MARKET
QUOTATIONS.
    
 
   
    As of September 21, 1998, there were approximately 32,000 registered holders
of Medtronic Common Stock and approximately 310 registered holders of AVECOR
Common Stock.
    
 
                              RECENT DEVELOPMENTS
 
MEDTRONIC STOCK OFFERING
 
   
    To be eligible to use the pooling of interests accounting method to account
for its merger with Physio-Control International Corporation ("Physio-Control")
and future acquisitions, Medtronic has recently completed an offering, at a
price per share of $56.75, of 12.5 million shares of Medtronic Common Stock,
which approximates that number of shares which were tainted for purposes of
pooling of interests accounting and were purchased by Medtronic in the open
market pursuant to its share repurchase program.
    
 
PHYSIO-CONTROL INTERNATIONAL CORPORATION
 
    On June 27, 1998, Medtronic entered into an agreement to acquire
Physio-Control, a company that designs, manufactures, markets, and services an
integrated line of noninvasive emergency cardiac defibrillator and vital sign
assessment devices, disposable electrodes, and data management software. Physio-
Control's products are used in both out-of-hospital and hospital settings for
the detection and treatment of life-threatening events including trauma, heart
attack, and the acute heart rhythm disturbances of ventricular fibrillation,
tachycardia, and bradycardia.
 
    Pursuant to the acquisition agreement, upon the fulfillment or waiver of
certain conditions, a wholly-owned subsidiary of Medtronic created for the
Physio-Control acquisition will merge with and into Physio-Control.
Physio-Control will then become a wholly-owned subsidiary of Medtronic in a
stock-for-stock merger that is expected to be tax-free and accounted for using
pooling of interests accounting treatment. In the Physio-Control merger, each
outstanding share of stock of Physio-Control will be exchanged for the right to
receive the fraction of a share of Medtronic Common Stock equal to $27.50
divided by the Average Stock Price of Medtronic Common Stock for a specified
period preceding the effective time of the Physio-Control merger. Physio-Control
has approximately 21 million shares outstanding on a fully diluted basis.
 
   
MIDAS REX, L.P.
    
 
   
    On September 22, 1998, Medtronic entered into an agreement to acquire Midas
Rex, a privately-held company with anticipated 1998 revenues of approximately
$55 million. Midas Rex, based in Fort Worth, Texas, designs, manufactures,
markets, distributes, and sells high-speed neurological powered instruments,
including pneumatic instrumentation for surgical dissection of bones, biometals,
bioceramics, and bioplastics. Other instruments manufactured by Midas Rex assist
in orthopedic, otolaryngological, maxillofacial, and craniofacial procedures, as
well as plastic surgery. Midas Rex also provides, through the Midas Rex
Institute, hands-on training and workshops designed to teach surgeons the
capabilities and procedures associated with Midas Rex's products. Pursuant to
the acquisition agreement, upon the fulfillment or waiver of certain conditions,
Medtronic or a subsidiary of Medtronic will acquire for a cash purchase price
all of the assets and certain liabilities of Midas Rex.
    
 
                                       42
<PAGE>
OTHER INVESTMENTS AND ACQUISITIONS
 
    Medtronic has historically been, and continues to be, actively engaged in
exploring business opportunities through investments and acquisitions. As such,
at any particular time, in addition to investments and acquisitions for which
definitive agreements have been executed and publicly announced, Medtronic is
routinely reviewing several other investment or acquisition opportunities of
varying magnitude and significance or negotiating the terms of such potential
investments or acquisitions prior to the execution of definitive agreements and
public announcements thereof.
 
            COMPARATIVE RIGHTS OF MEDTRONIC AND AVECOR SHAREHOLDERS
 
    Upon consummation of the Merger, shareholders of AVECOR will become
shareholders of Medtronic. Although Medtronic and AVECOR are both incorporated
under the laws of the state of Minnesota, the rights of Medtronic shareholders
under Medtronic's Restated Articles of Incorporation as amended ("Medtronic's
Articles") and Medtronic's Bylaws differ in certain respects from the rights of
AVECOR shareholders under AVECOR's Second Restated Articles of Incorporation, as
amended ("AVECOR's Articles"), and AVECOR's Bylaws, as amended ("AVECOR's
Bylaws"). Certain significant differences between the rights of Medtronic
shareholders and AVECOR shareholders are summarized below. This summary does
not, however, purport to be a complete description of all of the differences
between the rights of shareholders of AVECOR and the rights of shareholders of
Medtronic.
 
CLASSIFICATION, REMOVAL, AND NOMINATION OF DIRECTORS
 
    CLASSIFICATION.  Medtronic's Articles provide for a classified Board of
Directors, under which directors are elected to three-year terms, with one-third
of the directors being elected each year. AVECOR's Articles do not classify its
Board of Directors, and directors are elected each year for a one-year term.
 
    REMOVAL.  Medtronic's Articles provide that directors may be removed, with
or without cause, only by the vote of not less than 75% of the voting power of
all then outstanding voting shares. AVECOR's Bylaws provide that directors may
be removed, with or without cause, by the vote of the holders of a majority of
the shares then entitled to vote at an election of directors.
 
    NOMINATION.  Medtronic's Articles provide that nominations for the election
of directors may be made by or at the direction of the Medtronic Board of
Directors or by any shareholder entitled to vote in the election of directors
generally. Nominations by shareholders must be made pursuant to timely notice in
writing to the Secretary of Medtronic. To be timely, a shareholder's notice must
be delivered to or mailed and received at the principal executive offices of
Medtronic not less than 50 days nor more than 90 days prior to the meeting;
provided, however, that if less than 60 days' notice or prior public disclosure
of the date of the meeting is given or made to the shareholders, notice by the
shareholder to be timely must be so received not later than the close of
business on the tenth day following the day on which such notice of the date of
the meeting was mailed or such public disclosure was made. The notice must set
forth certain information concerning such shareholder and his or her nominee(s),
including their names and addresses, the principal occupation or employment of
the nominee(s), the class and number of shares of capital stock of Medtronic
that are beneficially owned by such persons, such other information as would be
required to be included in a proxy statement soliciting proxies for the election
of the nominees of such shareholder, and the consent of each nominee to serve as
a director of Medtronic if so elected. AVECOR's Articles and Bylaws do not
address the issue of nomination of directors.
 
    AMENDMENT OF PROVISIONS.  Medtronic's Articles require the affirmative vote
of not less than 75% of the voting power of all then outstanding voting shares
to amend, repeal or adopt any provisions inconsistent with provisions of
Medtronic's Articles regarding classification, removal, and nomination of
directors. AVECOR's Bylaws provide that AVECOR's Board of Directors has the
power to make, alter, amend or rescind provisions of AVECOR's Bylaws including
provisions regarding removal of directors.
 
                                       43
<PAGE>
    The above-described provisions of Medtronic's Articles and AVECOR's Articles
regarding directors will be subject to the terms of the certificate of
designation or other instrument creating any class or series of preferred stock
giving the holders of such class or series of preferred stock the right, voting
separately as a class, to elect one or more directors (such as is often required
by the terms of preferred stock in the event that dividend payments are in
arrears for a period of time). See "Comparative Rights of Medtronic Shareholders
and AVECOR Shareholders--Preferred Stock."
 
    These provisions regarding classification, removal, and nomination of
directors afford some assurance of stability in the composition of the Medtronic
Board of Directors, but may discourage or deter attempts by individuals or
entities to take control of Medtronic by electing their own slate of directors.
To the extent that potential acquirers of Medtronic stock are deterred by the
classified Board, such provision also may deter certain mergers, tender offers,
or other future takeover attempts which some or a majority of holders of
Medtronic Common Stock may deem to be in their best interests. In addition, the
classified Medtronic Board would delay shareholders who do not favor the
policies of Medtronic's Board of Directors from removing a majority of the
Medtronic Board of Directors for two years, unless they can obtain the requisite
vote.
 
    LIABILITY OF DIRECTORS.  Both Medtronic's Articles and AVECOR's Articles
exempt directors from personal liability to the corporation or its shareholders
for monetary damages for breach of fiduciary duty as a director to the full
extent permitted by Minnesota law.
 
PREFERRED STOCK
 
    Medtronic has 2,500,000 authorized but unissued shares of Preferred Stock,
par value $1 per share. Medtronic's Articles provide that whenever the holders
of a class or series of Preferred Stock have the right to elect any directors,
the election, term and other features of such directorships shall be governed by
the terms set forth in the resolution of the Medtronic Board of Directors
designating the rights and preferences of such class or series of Preferred
Stock, and any directors elected by the holders of Preferred Stock shall not be
divided into classes unless provision is expressly made for such classification
by the terms of such Preferred Stock. Shares of Medtronic Preferred Stock could
be issued that would have the right to elect directors, either separately or
together with the Medtronic Common Stock, with such directors either divided or
not divided into classes.
 
    Under certain circumstances such Medtronic Preferred Stock could be used to
create voting impediments or to deter persons seeking to effect a takeover or
otherwise gain control of Medtronic in a transaction which holders of some or a
majority of the Medtronic Common Stock may deem to be in their best interests.
Such shares of Medtronic Preferred stock could be sold in public or private
transactions to purchasers who might support the Medtronic Board of Directors in
opposing a takeover bid that the Medtronic Board of Directors determines not to
be in the best interests of Medtronic and its shareholders. In addition, the
Medtronic Board of Directors could authorize holders of a class or series of
Preferred Stock to vote, either separately as a class or together with the
holders of Medtronic Common Stock, on any merger, sale, or exchange of assets by
Medtronic or any other extraordinary corporate transaction. The ability to issue
such Medtronic Preferred Stock might have the effect of discouraging an attempt
by another person or entity, through the acquisition of a substantial number of
shares of Medtronic Common Stock, to acquire control of Medtronic with a view to
imposing a merger, sale of all or any part of the assets or a similar
transaction, because the issuance of new shares could be used to dilute the
stock ownership of such person or entity.
 
    AVECOR has 2,000,000 authorized but unissued shares of Preferred Stock, par
value $.01 per share, and the Board of Directors has the authority to fix or
alter the terms of such shares. In connection with the adoption of the AVECOR
Rights Agreement, 200,000 of such shares were designated as Series A Junior
Preferred Stock. See "Comparative Rights of Medtronic and AVECOR
Shareholders--Shareholder Rights Plans."
 
                                       44
<PAGE>
SPECIAL MEETINGS OF SHAREHOLDERS
 
    Under Minnesota law, a special meeting of shareholders may be called by
certain officers, two or more directors, a person authorized to do so in the
articles or bylaws, or shareholders holding at least 10% of the voting power of
all shares entitled to vote, except that a special meeting for the purpose of
considering an action to effect, directly or indirectly, a business combination
must be called by shareholders holding at least 25% of the voting power of all
shares entitled to vote.
 
VOTING RIGHTS; SHAREHOLDER APPROVALS
 
    Under both Medtronic's Articles and AVECOR's Articles, holders of Medtronic
Common Stock and AVECOR Common Stock, respectively, are entitled to one vote per
share on all matters submitted to a vote of the shareholders. Medtronic's Bylaws
provide that, except as specifically required otherwise under Medtronic's
Articles, Bylaws or Minnesota law, all matters submitted to the shareholders are
decided by a majority vote of the shares entitled to vote and represented at a
meeting at which there is a quorum.
 
CUMULATIVE VOTING
 
    Neither Medtronic's Articles nor AVECOR's Articles provide for cumulative
voting with regard to the Medtronic Common Stock or the AVECOR Common Stock,
respectively.
 
PREEMPTIVE RIGHTS
 
    Under Medtronic's Articles and AVECOR's Articles, holders of Medtronic stock
and AVECOR stock, respectively, are expressly denied preemptive rights. The MBCA
provides that a corporation's shareholders have preemptive rights only if such
rights are expressly granted in the corporation's articles of incorporation.
 
AMENDMENT OF THE ARTICLES OF INCORPORATION
 
    Under Minnesota law, an amendment to the articles of incorporation requires
the affirmative vote of the holders of a majority of the shares present and
entitled to vote unless a larger affirmative vote is required by the
corporation's articles. Except as specifically described otherwise in this
"Comparative Rights of Medtronic Shareholders and AVECOR Shareholders," neither
Medtronic's Articles nor AVECOR's Articles contain any provisions that require a
larger affirmative vote in order to amend Medtronic's Articles.
 
BUSINESS COMBINATIONS AND CONTROL SHARE ACQUISITIONS
 
    Medtronic and AVECOR are governed by Sections 302A.671 and 302A.673 of the
MBCA. In general, Section 302A.671 provides that the shares of a corporation
acquired in a "control share acquisition" have no voting rights unless voting
rights are approved in a prescribed manner. A "control share acquisition" is an
acquisition, directly or indirectly, of beneficial ownership of shares that
would, when added to all other shares beneficially owned by the acquiring
person, entitle the acquiring person to have voting power of 20% or more in the
election of directors. In general, Section 302A.673 prohibits a public Minnesota
corporation from engaging in a "business combination" with an "interested
shareholder" for a period of four years after the date of the transaction in
which the person became an interested shareholder, unless the business
combination is approved in a prescribed manner. "Business combination" includes
mergers, asset sales and other transactions resulting in a financial benefit to
the interested shareholder. An "interested shareholder" is a person who is the
beneficial owner, directly or indirectly, of 10% or more of the corporation's
voting stock or who is an affiliate or associate of the corporation and at any
time within four years prior to the date in question was the beneficial owner,
directly or indirectly, of 10% or more of the corporation's voting stock. Such
provisions of Minnesota law could have the effect of delaying, deferring, or
preventing a change in control of Medtronic or AVECOR.
 
                                       45
<PAGE>
SHAREHOLDER RIGHTS PLANS
 
    MEDTRONIC.  Medtronic has in effect a Shareholder Rights Plan and has
entered into a Rights Agreement with Norwest Bank Minnesota, N.A., as Rights
Agent. The Rights Plan provides for a dividend distribution of one preferred
stock purchase right (a "Medtronic Right") to be attached to each outstanding
share of Medtronic Common Stock. The Medtronic Right associated with each
outstanding share of Medtronic Common Stock entitles the holder to buy 1/1600th
of a Series A Junior Participating Preferred Share (the "Series A Preferred
Shares") of Medtronic, which is substantially equivalent to one share of
Medtronic Common Stock, at an exercise price of $37.50 per 1/1600th of a Series
A Preferred Share. The Medtronic Rights are not currently exercisable or
transferable apart from the Medtronic Common Stock.
 
    The Medtronic Rights will become exercisable if a person or group acquires
15% or more of the Medtronic Common Stock (and thereby becomes an "Acquiring
Person") or announces a tender offer or exchange offer that would increase the
Acquiring Person's beneficial ownership to 15% or more of the outstanding
Medtronic Common Stock, subject to certain exceptions. After the Medtronic
Rights become exercisable, each Medtronic Right entitles the holder (other the
Acquiring Person), instead, to purchase Medtronic Common Stock that has a market
value of two times the exercise price of the Medtronic Right. If Medtronic is
acquired in a merger or other business combination transaction, each exercisable
Medtronic Right entitles the holder to purchase common stock of the Acquiring
Person or an affiliate that has a market value of two times the exercise price
of the Medtronic Right. Each Medtronic Right is redeemable by Medtronic at
$.000625 any time before a person or group triggers the 15% threshold to become
an Acquiring Person. The Medtronic Rights expire on July 10, 2001.
 
    The Medtronic Rights issued under the Medtronic Shareholder Rights Plan may
make any merger not approved by Medtronic's Board of Directors prohibitively
expensive, because the Medtronic Rights allow Medtronic shareholders to purchase
the voting securities of Medtronic or a potential acquirer at one-half of its
fair market value.
 
    AVECOR.  AVECOR also has entered into a Rights Agreement with Norwest Bank
Minnesota, N.A. (the "AVECOR Rights Agreement"). The AVECOR Rights Agreement
provides for issuance of one preferred share purchase right (an "AVECOR Right")
to be attached to each outstanding share of AVECOR Common Stock. Upon certain
events, each AVECOR Right entitles the registered holder to purchase from AVECOR
one one-thousandth of a share (a "Preferred Share Fraction") of AVECOR's Series
A Junior Preferred Stock or a combination of securities and assets of equivalent
value at a purchase price of $80.00, subject to adjustment.
 
    The AVECOR Rights Agreement further provides that, with certain exceptions,
upon 10 days after (i) a person or group (an "Acquiring Person") becomes the
beneficial owner of more than 15% of the then outstanding shares of AVECOR
Common Stock, or (ii) at least a majority of the "Continuing Directors" of
AVECOR's Board of Directors (as defined in the AVECOR Rights Agreement)
determine that a person is an "Adverse Person" (also as defined in the AVECOR
Rights Agreement), then each holder of an AVECOR Right (other than the Acquiring
Person or the Adverse Person, as the case may be) will thereafter have the right
to receive, upon exercise, that number of Preferred Share Fractions (or, in
certain circumstances, that number of shares of AVECOR Common Stock, cash,
property, or other securities of AVECOR) having a market value equal to two
times the exercise price of the AVECOR Right.
 
    In the event that (i) AVECOR is acquired in a merger or other business
combination in which AVECOR is not the surviving corporation or in which AVECOR
Common Stock is changed or exchanged, or (ii) 50% or more of AVECOR's assets or
earning power is sold or transferred, and such transactions described in (i) and
(ii) are not "Permitted Offers" (as defined in the AVECOR Rights Agreement),
then the AVECOR Rights Agreement provides that each holder of an AVECOR Right
(except for an Acquiring Person or an Adverse Person) shall thereafter have the
right to receive, upon exercise, shares of common stock of the acquiring entity
at half of the then-current market price of such shares.
 
                                       46
<PAGE>
    The AVECOR Rights may be redeemed by action taken by a majority of the
Continuing Directors at a price of $.001 per AVECOR Right at any time prior to
the time 10 days after which a person is declared an Adverse Person or after
which an Acquiring Person acquires or obtains the right to acquire beneficial
ownership of 15% or more of the then outstanding shares of AVECOR Common Stock.
 
    In connection with the consideration and approval of the Merger, AVECOR's
Board of Directors approved amendments to the AVECOR Rights Agreement on July 12
and August 21, 1998. These amendments were adopted to clarify the effect under
the AVECOR Rights Agreement of the Merger with Medtronic or any similar
transaction, and to provide that Medtronic will not be declared an Adverse
Person because of Medtronic's beneficial ownership of AVECOR Common Stock as a
result of the Stock Option Agreement and the voting agreements between Medtronic
and officers and directors of AVECOR. Pursuant to the AVECOR Rights Agreement,
as amended, all AVECOR Rights will expire upon consummation of the Merger.
 
RELATED PERSON BUSINESS TRANSACTIONS
 
    Medtronic's Articles provide that, in certain circumstances, an affirmative
vote of two-thirds of the voting power of all then outstanding voting shares is
required for the approval or authorization of any "related person business
transaction." Such two-thirds approval is not required, however, if (i) a
majority vote of "continuing directors" (as defined below) expressly approves
the related person business transaction, or (ii) the related person business
transaction is a merger, consolidation, exchange of shares or sale of all or
substantially all of the assets of Medtronic, and the cash or fair market value
of the property received by the Medtronic shareholders is equal to a defined
minimum purchase price. For purposes of this provision, a "continuing director"
means, generally, those directors who were directors before the "related person"
(as defined below) became a related person.
 
    Generally, a related person business transaction includes (i) any merger or
consolidation of Medtronic with or into a related person, (ii) any exchange of
shares of Medtronic (or a subsidiary) for shares of a related person which would
have required an affirmative vote of at least a majority of the voting power of
the outstanding shares entitled to vote, (iii) any sale, lease, exchange,
transfer, or other disposition (in one transaction or a series of transactions),
including without limitation a mortgage or any other security device, of all or
any substantial part of the assets of Medtronic (or a subsidiary) to or with a
related person, (iv) any sale, lease, transfer, or other disposition (in one
transaction or a series of transactions) of all or any substantial part of the
assets of a related person to or with Medtronic (or a subsidiary), (v) the
issuance, sale, transfer, or other disposition to a related person of any
securities of Medtronic (except pursuant to stock dividends, stock splits, or
similar transactions that would not have the effect of increasing the proportion
of voting power of a related person) or of a subsidiary (except pursuant to a
pro rata distribution to all holders of Medtronic Common Stock), (vi) any
recapitalization or reclassification that would have the effect of increasing
the proportionate voting power of a related person, and (vii) any agreement,
contract, arrangement, or understanding providing for any of the transactions
described above.
 
    Generally, for purposes of a related person business transaction, the term
"related person" is broadly defined to include a wide range of potential
persons, including any person or entity that, together with affiliates and
associates, beneficially owns 15% or more of the outstanding voting stock of
Medtronic.
 
    Such a provision could have the effect of impeding a potential acquirer of
Medtronic by requiring a larger than normal majority of Medtronic shareholders
to approve a transaction. There is no similar "related person business
transaction" provision in AVECOR's Articles.
 
                                       47
<PAGE>
                          INFORMATION REGARDING AVECOR
 
GENERAL DEVELOPMENT OF BUSINESS
 
    AVECOR develops, manufactures, and markets specialty medical devices for
heart/lung bypass surgery and long-term respiratory support. AVECOR's products
include the AFFINITY microporous, hollow fiber membrane oxygenator and related
blood reservoirs, a line of solid silicone membrane oxygenators and related
blood reservoirs, the AFFINITY blood pump, the MYOTHERM cardioplegia delivery
system, SIGNATURE custom tubing packs, and the AFFINITY arterial filter.
 
    AVECOR was incorporated in Minnesota in December 1990 and began operations
in 1991 when it purchased the surgical division of SCIMED Life Systems, Inc.
(the "Predecessor Business"). The assets purchased included a line of solid
silicone membrane oxygenators. Since the acquisition of the Predecessor
Business, AVECOR has engaged in extensive product development, resulting in the
introduction and receipt of regulatory clearance from the U.S. Food and Drug
Administration (the "FDA") to market the following proprietary products:
 
<TABLE>
<CAPTION>
PRODUCT                                                                                           APPROVAL DATE
- ----------------------------------------------------------------------------------------------  ------------------
<S>                                                                                             <C>
MYOTHERM cardioplegia delivery system.........................................................        October 1991
SIGNATURE custom tubing packs.................................................................           July 1993
AFFINITY oxygenator...........................................................................       November 1993
AFFINITY blood reservoirs.....................................................................           July 1994
AFFINITY arterial filter......................................................................        October 1995
MYOTHERM XP-TM- (improved cardioplegia delivery system).......................................           July 1997
AFFINITY blood pump...........................................................................         August 1997
AFFINITY oxygenator with TRILLIUM-TM- bio-passive surface.....................................       February 1998
</TABLE>
 
    In December 1992, AVECOR acquired Cardio Med Ltd., a corporation organized
under the laws of England and Wales ("Cardio Med"). Cardio Med had been a
distributor of AVECOR's disposable membrane oxygenators, cardiotomy reservoirs,
and cardioplegia systems and manufactured its own proprietary line of custom
tubing packs. As a result of the acquisition, Cardio Med has become a
wholly-owned subsidiary of AVECOR. Cardio Med's name has since been changed to
AVECOR Cardiovascular Ltd. ("AVECOR Ltd."). During 1995, AVECOR incorporated
AVECOR Foreign Sales Corporation as a wholly-owned subsidiary of AVECOR and
opened a sales office in France, organized as AVECOR Cardiovascular France
S.A.R.L., a French subsidiary of AVECOR Ltd.
 
INDUSTRY BACKGROUND AND MARKETS
 
    INDUSTRY BACKGROUND.  AVECOR's products are used in surgical procedures
requiring heart/lung bypass, such as the treatment of coronary artery disease by
coronary artery bypass graft surgery ("CABG" or "coronary bypass surgery"),
heart valve replacement surgery, and pediatric and neonatal congenital heart
defect surgery. There were approximately 850,000 heart/lung bypass procedures
performed worldwide in 1997, including approximately 400,000 of such procedures
performed in the United States, and approximately 265,000 of such procedures
performed in Europe. Certain of AVECOR's products are also used in nonsurgical
applications, such as the long-term cardiopulmonary support of premature
infants, newborns, and other patients with life-threatening respiratory
disorders.
 
    The primary use of AVECOR's products is for heart/lung bypass procedures
during the surgical treatment of coronary artery disease. Coronary artery
disease, the leading cause of death in the United States, is the atherosclerotic
narrowing of the coronary arteries that supply blood to the heart.
Atherosclerosis is the accumulation of cholesterol and blood products on the
inner lining of an artery that causes the arterial wall to thicken and lose
elasticity, narrowing the inner diameter of the artery. According to an estimate
by the American Heart Association, approximately 13,490,000 Americans have a
history of heart
 
                                       48
<PAGE>
attack, angina pectoris (chest pain), or both, which are generally associated
with coronary artery disease. The American Heart Association estimated that, in
the United States in 1996, coronary artery disease would result in 1,500,000
acute myocardial infarctions, or heart attacks, of which approximately 500,000
would result in death.
 
    In the late 1960s, cardiovascular surgeons pioneered coronary bypass
surgery, a surgical treatment for severe cases of coronary artery disease in
which blood vessel grafts are used to bypass the site of the blocked arteries.
Several of these procedures or "grafts" may be performed during a single surgery
in order to bypass atherosclerotic lesions in more than one of the coronary
arteries, which is commonly referred to as "multi-vessel" coronary artery
disease. Coronary bypass surgery generally requires that the patient be put on a
heart/lung bypass circuit to enable the surgeon to operate on a still,
relatively bloodless heart. The heart/lung bypass circuit is a series of
interconnected specialty medical devices that together function as a patient's
heart and lungs by temporarily oxygenating and circulating blood while the
patient's own heart and lungs are rendered inactive. AVECOR believes coronary
bypass surgery accounts for approximately 75% of the total heart/lung bypass
procedures performed in the United States and over 50% of the procedures
performed in Europe.
 
    Although coronary bypass surgery is a highly invasive procedure, it has been
shown to be highly effective in treating coronary artery disease, and the number
of procedures performed annually in the United States has grown from
approximately 200,000 in 1982 to over 400,000 in 1997 (multiple procedures may
be performed during a single surgery where multi-vessel disease is present). The
annual worldwide growth rate in the number of coronary bypass procedures has
fluctuated from year to year for various reasons.
 
    Since the development of coronary bypass surgery, a number of nonsurgical
interventional treatments for coronary artery disease have been developed which,
depending on the extent and nature of the disease as well as physician
preference, may be used as an alternative to coronary bypass surgery. These
nonsurgical treatments, while generally less costly per procedure, have
limitations and to date have not resulted in reduced demand for coronary bypass
surgery.
 
    Percutaneous transluminal coronary angioplasty ("PTCA") was introduced in
the early 1980s as a nonsurgical treatment for coronary artery disease. PTCA is
performed by guiding a balloon-tipped catheter to the site of an atherosclerotic
lesion, followed by several courses of dilation under high balloon pressure. For
many patients, PTCA represents a less costly and less traumatic alternative to
bypass surgery, while for other patients it represents a preferred alternative
to drug therapy. While the number of PTCA procedures performed grew
significantly in the 1980s and early 1990s, the number of coronary bypass
procedures performed annually also continued to grow during this period.
 
    Although the average cost of a PTCA procedure is approximately one-half of
the average cost of coronary bypass surgery, the need for further interventions
for many patients tends to significantly reduce the long-term cost differential
between these two types of procedures. Studies have indicated that 30% to 50% of
PTCA procedures are complicated by "restenosis," a renarrowing, or often
reclosure, of the dilated vessel within six months. An artery complicated by
restenosis often requires repeat procedures, reducing the overall
cost-effectiveness of PTCA. For a significant number of PTCA patients, coronary
bypass surgery is ultimately performed. In patients with multi-vessel coronary
artery disease, a randomized study has shown that within three years of
receiving treatment, only 14% of patients receiving coronary bypass surgery
required retreatment ("revascularization") while 60% of patients receiving PTCA
required revascularization. Additional studies have confirmed that approximately
20% of PTCA patients with multi-vessel disease will undergo coronary bypass
surgery within one year of receiving PTCA. Based upon the higher rates of
revascularization of patients receiving PTCA rather than coronary bypass
surgery, several studies have concluded that over a three-year period the
overall average cost of PTCA procedures exceeds 75% of the average cost of
coronary bypass surgery.
 
                                       49
<PAGE>
    In response to the limitations of PTCA, a variety of "second generation"
interventional devices for coronary artery disease have been developed,
including atherectomy devices (catheter devices that cut and remove
atherosclerotic materials from the arterial wall), rotational ablation devices
(catheter devices that use a rotating burr to remove material), laser catheter
devices (devices that use laser energy to reduce accumulated materials in
arteries), and coronary stents (expandable metal frames that are positioned
within the diseased area in the coronary artery to maintain the vessel opening).
Of these devices, coronary stents have demonstrated the best potential to date
to reduce restenosis in a randomized population. Studies have concluded that the
rate of restenosis in patients receiving coronary stents following PTCA is
approximately 30% lower than in patients treated only by PTCA. However, the use
of stenting in connection with PTCA greatly increases the cost of the PTCA
procedure. One study has indicated that the average cost per procedure for
elective stenting in connection with PTCA was approximately twice the cost of
PTCA without stenting (or approximately equal to the cost of coronary bypass
surgery).
 
    In addition to the existing nonsurgical treatments for coronary artery
disease, an additional treatment modality has emerged for both coronary artery
disease and heart valve replacement procedures (discussed below), which involves
"least" or "minimally" invasive surgical procedures. A significant number of
these techniques involve small surgical incisions in the patient's chest in lieu
of the larger incision used in traditional CABG or valve replacement surgeries.
Specialized surgical instruments used in connection with endoscopes enable
surgeons to perform CABG or valve replacement surgeries via these smaller
incisions. In some variations of this type of procedure, only a modified form of
the heart/lung bypass circuit is required, which includes an oxygenator and
related disposables. In other variations of this type of procedure, however, a
heart/lung bypass circuit is not utilized.
 
    While this modality is in its developmental stages and currently requires
significant surgical skill and training, the potential benefits to patients from
this type of surgery are a reduced recovery period from the elimination of the
heart/lung bypass circuit in some procedures and lower risk of infection as a
result of the smaller incision utilized in some of the procedures. Although some
of the patients currently eligible for treatment using these types of procedures
are not candidates for more invasive and less costly procedures, there can be no
assurance that this type of surgical procedure will not represent a significant
portion of the CABG or heart valve replacement procedures in the future.
Therefore, it cannot be determined at this time what effect, if any, the
development and acceptance of these procedures may have on the market for
AVECOR's disposable heart/lung bypass circuit components.
 
    A second significant use of AVECOR's products in conjunction with heart/lung
bypass procedures is in heart valve replacement surgery. Heart valve replacement
surgery is also an open heart surgical procedure, involving the replacement of
valves that regulate the flow of blood between chambers in the heart. Valve
replacement may be required where the valve has become narrowed or ineffective
due to the build-up of calcium or scar tissue, or where there is a congenital
defect or some other form of physical damage to the valve. Like coronary bypass
surgery, valve replacement surgery requires that the patient be put on a
heart/lung bypass circuit. AVECOR believes approximately 20% of the heart/lung
bypass procedures performed in the United States, and 25% of those performed in
Europe, are performed in heart valve replacement surgery.
 
    Pediatric and neonatal congenital heart defect surgery is another heart/lung
bypass procedure that uses several of AVECOR's products. These procedures are
undertaken to correct developmental defects in the heart of a child or infant.
AVECOR believes approximately 5% of the heart/lung bypass procedures performed
in the United States and approximately 10% of those performed in Europe are
performed in connection with this type of corrective surgery.
 
    The primary nonsurgical use of AVECOR's products is in connection with a
procedure known as extracorporeal membrane oxygenation ("ECMO"). ECMO is the
long-term cardiopulmonary support of premature infants, newborns, and other
patients with life threatening respiratory disorders. The relatively small ECMO
market served by AVECOR is comprised of 118 established centers worldwide, in
which
 
                                       50
<PAGE>
approximately 1,500 neonatal ECMO procedures (procedures performed on children
younger than one year) were performed in 1997. Neonatal ECMO procedures
constitute the vast majority of all ECMO procedures performed. There has been
relatively little growth in the overall ECMO market in recent years and AVECOR
believes growth in this market will remain limited until technology overcomes
complications that are common in long-term respiratory support, such as
intracranial bleeding due to the associated long-term use of anti-coagulants.
Since AVECOR manufactures what it believes to be the only oxygenator that has
received clearance from the FDA for sale for long-term cardiopulmonary support
for periods greater than 24 hours, AVECOR believes it has a competitive
advantage in this relatively small market.
 
    HEART/LUNG BYPASS CIRCUIT.  In procedures requiring cardiopulmonary support,
the patient is connected to a series of interconnected specialty medical
devices, collectively called a heart/lung bypass circuit. The heart/lung bypass
circuit functions as the patient's heart and lungs by temporarily oxygenating
and circulating blood while the patient's own heart and lungs are rendered
inactive. The devices in the heart/ lung bypass circuit are operated by a
skilled medical professional known as a perfusionist, under the direction of a
surgeon. The primary components of a heart/lung bypass circuit, including the
oxygenator, are single-use, disposable products. Heart/lung bypass circuits are
customized for the particular practices of individual perfusionists.
 
    In a typical heart/lung bypass procedure, blood is removed via surgically
inserted "cannulae" (hollow tubes with specifically designed tips that
facilitate the drainage or infusion of blood into or out of a patient's body)
from the patient's vena cava (the large vessels leading to the heart). The blood
flows from the patient's vena cava by gravity into a venous blood reservoir
where it is collected and "de-bubbled" (air is eliminated from the blood). In
addition, blood that is suctioned from the patient or drained from the heart is
filtered and de-bubbled through a cardiotomy reservoir. This blood is then also
added to the venous blood reservoir. From the venous blood reservoir, the blood
is mechanically pumped by a blood pump serving as a replacement for the
patient's heart through an oxygenator. The oxygenator serves as a replacement
for the patient's lungs by removing carbon dioxide from and adding oxygen to the
blood. The carbon dioxide and oxygen levels in the blood are monitored with
blood gas monitoring equipment, allowing the perfusionist to make the proper
adjustments to maintain the correct concentrations. The oxygenator also controls
the temperature of the blood by means of an integral heat exchanger connected to
a heater-cooler console. The oxygenated blood is then returned to the patient
through a final (arterial) filter that removes any potential air or small
particles. This artificial heart/lung system is the primary component of the
bypass circuit.
 
    In addition to the artificial heart/lung system, most bypass circuits also
include a cardioplegia delivery system. During most cardiac surgical procedures,
the heart is stopped (arrested) to provide the surgeon with a motionless field
for the delicate surgery. When this occurs, the heart muscle receives very
little blood supply. A cardioplegia system infuses specially formulated
solutions (which often include oxygenated blood) directly into the patient's
coronary arteries. In addition to delivering nutrients to the heart, these
solutions are also used to arrest the heart and maintain prescribed
temperatures.
 
    In order to salvage the patient's own blood during surgery, a cell-saver
circuit may be used to collect and concentrate the patient's blood into washed,
packed cells which can be reinfused at a later time to improve the patient's red
blood cell count without the risks associated with donated blood. Another method
of concentrating the patient's red blood cells is with the use of a
hemoconcentrator. This device removes excess fluid from the patient's blood
(concentrating the red blood cells) and also preserves the plasma of the blood
that is generally discarded with typical blood cell salvaging.
 
    The heart/lung bypass circuit is completed by connecting all of the devices
with tubing. Frequently, this tubing is pre-connected according to the
instructions of individual perfusionists with all or some of the devices in the
circuit and marketed as custom tubing packs. Increasingly, all of the components
in the heart/lung bypass circuit are assembled and packaged in a complete,
single container for a single heart/lung bypass procedure.
 
                                       51
<PAGE>
    MARKETS.  AVECOR's products are primarily sold to hospitals that perform
heart/lung bypass surgery. There were approximately 1,000 hospitals in the
United States and about 400 hospitals in Europe that performed these procedures
in 1997. Over 400,000 heart/lung bypass procedures were performed in the United
States and approximately 265,000 such procedures were performed in Europe in
1997. Coronary bypass surgeries constitute a significant portion of the total
number of heart/lung bypass procedures performed each year. Although the number
of heart/lung bypass procedures performed may have been less than the number of
coronary bypass surgeries due to multiple grafts being performed during some
surgeries, the number of graft procedures performed in the United States each
year grew from less than 200,000 in 1982 to over 400,000 in 1997.
 
    The current annual worldwide market for disposable products and related
hardware and accessories for heart/lung bypass surgery is estimated by industry
analysts to be approximately $800 million, over $600 million of which is
estimated to be attributable to disposable products. The two largest individual
markets for disposable products are the oxygenator market, estimated at
approximately $200 million in annual sales, and the custom tubing pack market,
estimated at approximately $100 million in annual sales. AVECOR's current
proprietary product offerings participate in an annual worldwide market for
disposable products estimated to be approximately $480 million, and AVECOR
anticipates that its proprietary products under development, including
additional products coated with its new TRILLIUM bio-passive surface, should
allow AVECOR to pursue a greater portion of the disposable product market.
 
PRODUCTS
 
    AVECOR currently offers four primary product lines: the AFFINITY line; the
solid silicone membrane oxygenator line; the MYOTHERM cardioplegia delivery
system; and SIGNATURE custom tubing packs. "Other products" include products
distributed by AVECOR which do not represent any of AVECOR's primary product
lines and, combined or individually, do not represent a primary product line
within AVECOR's business. The following table sets forth the amounts and
percentages of AVECOR's consolidated net sales attributable to these four
product lines for the periods shown.
<TABLE>
<CAPTION>
                                                                              YEARS ENDED DECEMBER 31,
                                                          ----------------------------------------------------------------
<S>                                                       <C>        <C>        <C>        <C>        <C>        <C>
                                                                  1997                  1996                  1995
                                                          --------------------  --------------------  --------------------
 
<CAPTION>
                                                                               (DOLLARS IN THOUSANDS)
<S>                                                       <C>        <C>        <C>        <C>        <C>        <C>
AFFINITY line...........................................  $  26,185         56% $  25,488         57% $  18,329         55%
SIGNATURE custom tubing packs...........................      9,803         21      7,402         17      3,459         10
Silicone membrane oxygenator line.......................      7,081         15      7,517         17      7,793         24
MYOTHERM cardioplegia deliver system....................      3,655          8      3,994          9      3,759         11
Other products..........................................        140     --         --         --         --         --
                                                          ---------        ---  ---------        ---  ---------        ---
  TOTAL.................................................  $  46,864        100% $  44,401        100% $  33,340        100%
                                                          ---------        ---  ---------        ---  ---------        ---
                                                          ---------        ---  ---------        ---  ---------        ---
</TABLE>
 
    AFFINITY LINE.  AVECOR's AFFINITY line is currently comprised of the
AFFINITY oxygenator, the AFFINITY blood pump, a hardshell cardiotomy venous
reservoir, and a venous reservoir bag.
 
    The AFFINITY oxygenator is a microporous, hollow fiber membrane oxygenator
which exchanges the carbon dioxide in the patient's blood for oxygen, returning
oxygenated blood to the patient through the heart/lung bypass circuit. This
oxygenator incorporates AVECOR's patented radial flow and graduated density
fiber bundle, both of which were developed through AVECOR's use of
"computational fluid dynamics." Computational fluid dynamics helped AVECOR
design the AFFINITY oxygenator with features such as a lowered blood phase
pressure drop, a more uniform flow of blood through the device's fiber bundle,
and reduced damage to the blood as it passes through the device's blood phase.
The key features of the AFFINITY oxygenator include the following:
 
                                       52
<PAGE>
    - HIGH GAS TRANSFER. AVECOR believes that the AFFINITY oxygenator offers
      superior gas transfer performance. Studies conducted by independent
      investigators have demonstrated that the AFFINITY oxygenator has gas
      transfer performance equal or superior to that of most competing
      oxygenators. AVECOR believes that most perfusionists desire oxygenators
      that provide optimum gas transfer performance to assure safety for
      patients requiring greater oxygen transfer capability, such as larger
      patients and patients operated on under lighter anesthesia or at warmer
      temperatures.
 
    - LOW PRESSURE DROP. Studies conducted by independent investigators have
      determined the pressure drop across the blood phase of the AFFINITY
      oxygenator to be as low or lower than that of other leading products.
      AVECOR believes that perfusionists generally wish to avoid large pressure
      drops during heart/lung bypass procedures due to the risk of line failures
      associated with high pressure drop.
 
    - LOW PRIMING VOLUME. The AFFINITY oxygenator has a priming volume which
      AVECOR believes to be one of the lowest priming volumes among oxygenators
      currently available. Lower priming volume can result in less set-up time
      for the perfusionist, reduced dilution of the patient's blood with priming
      solutions, and a reduced use of the patient's blood for priming, which
      lessens the possibility that costly and potentially dangerous donor blood
      products will need to be introduced during the procedure.
 
    - EASE OF USE. The AFFINITY oxygenator has been designed to be convenient to
      set up, prime, and operate. The AFFINITY oxygenator's relatively small
      size and universal adaptability contribute to its ease of handling, and
      its clear case helps to assure quick, complete priming and ongoing visual
      checks during the procedure. The device's unique casing design and a
      proprietary manufacturing technique result in precise alignment of the
      uppermost blood port with the top of the fiber bundle, allowing for ease
      in venting air during the priming procedure. AVECOR believes that
      perfusionists have a preference for oxygenators that permit easy removal
      of air during priming and ease of monitoring for the presence of air
      during the procedure.
 
    Although competing oxygenators are generally designed to maximize one or
more of these key features, AVECOR believes the performance of the AFFINITY
oxygenator to be equal or superior to competing products across a broad range of
performance characteristics: gas transfer capability, pressure drop, priming
volume, and ease of use.
 
    In July 1993, AVECOR began international marketing of the AFFINITY
oxygenator. AVECOR began the commercial release of the AFFINITY oxygenator in
the U.S. market in February 1994, following marketing clearance from the FDA.
 
    In February 1997, AVECOR received regulatory clearance from the FDA to
market its AFFINITY oxygenator with TRILLIUM bio-passive surface. The TRILLIUM
bio-passive surface is produced by coating all blood-contact surfaces in the
oxygenator with a non-leaching synthetic hydrophilic polymer that contains a
small amount of heparin, a widely used anti-coagulant. This surface is designed
to minimize activation of blood constituents which otherwise occurs as a result
of contact with conventional synthetic surfaces. By adding the AFFINITY
oxygenator with TRILLIUM bio-passive surface, AVECOR will be able to offer a
product option that certain competitors now promote.
 
    In the heart/lung bypass circuit, the blood reservoir serves as a filtering
and storage device. The AFFINITY line offers two blood reservoirs, a hardshell
cardiotomy venous reservoir, and a venous reservoir bag. Computational fluid
dynamics modeling was also used in the development of these reservoirs. The
hardshell reservoir can be used as a stand-alone unit or can be integrated with
the AFFINITY oxygenator in one unit. The venous reservoir bag maintains
simplicity in its design while offering optimum priming ease, efficient air
handling, and excellent mixing characteristics. AVECOR received U.S. marketing
clearance from the FDA for its AFFINITY blood reservoirs in July 1994 and began
marketing the devices following clearance. By offering these blood reservoirs in
the AFFINITY line, AVECOR is able to configure systems to meet its customers'
needs.
 
                                       53
<PAGE>
    The AFFINITY Blood Pump System incorporates a motor and control console, a
rotor housing, rotor assembly, and a disposable pump chamber. AVECOR believes
that the AFFINITY Blood Pump System offers a number of clinical safety
advantages over existing centrifugal or standard roller-type pumps. In
particular, the modified roller-type design of the AFFINITY Blood Pump System is
designed to (i) prevent significant negative pressure at the inlet, which
minimizes the potential for cavitation; (ii) not permit the draining of the
venous reservoir and the resulting introduction of air into the bypass circuit;
(iii) not create high discharge pressures sufficient to disrupt the tubing
connections in the bypass circuit; and (iv) not allow retrograde flow. AVECOR
believes that the AFFINITY Blood Pump System is the first and only available
blood pump to combine these safety features with performance comparable to
available pumps.
 
    There can be no assurance that the AFFINITY Blood Pump System will be
perceived as superior to currently available blood pumps, that competitors will
not introduce future products with superior performance characteristics, or that
the AFFINITY Blood Pump System will achieve market acceptance or generate
material revenues for AVECOR at any time in the near future, if at all.
 
    In August 1997, AVECOR received regulatory clearance from the FDA to market
the AFFINITY Blood Pump System. By adding the AFFINITY Blood Pump System to its
product line, AVECOR is now able to offer a complete line of proprietary devices
comprising the major components of the heart/lung bypass circuit.
 
    SIGNATURE CUSTOM TUBING PACKS.  AVECOR's Signature custom tubing packs
include the tubing and other connections used to integrate the various
components of the heart/lung bypass circuit and ECMO system. The components to
be included in each tubing pack and the manner in which they are arranged and
connected are determined by the specifications provided by AVECOR's individual
customers. AVECOR has developed computer software that allows it to design and
fully document custom tubing packs according to individual customer
specifications and to quote prices based on these specifications within hours of
a customer request. AVECOR believes that this service provides it with a
significant competitive advantage. While many of the devices included in
AVECOR's SIGNATURE custom tubing packs are manufactured by AVECOR, AVECOR
currently does not manufacture all the devices that may be requested by
customers. Consequently, AVECOR is currently required to purchase certain
components of its SIGNATURE custom tubing packs from other medical device
manufacturers. AVECOR received marketing clearance from the FDA for its
SIGNATURE custom tubing packs in June 1993.
 
    In October 1995, AVECOR received FDA clearance to market its AFFINITY
arterial filter. AVECOR began sales of this product to customers in late 1995,
with full worldwide release in the first quarter of 1996. The AFFINITY arterial
filter is the final component in the circuit of specialized medical devices used
in heart/lung bypass surgery, ensuring that the oxygenated blood is free of air
or particulate emboli before re-entering the patient's body. AVECOR believes
that the AFFINITY arterial filter offers low volume priming, high visibility,
and excellent air handling and hemodynamics. The vast majority of AFFINITY
arterial filter devices are sold as components of its SIGNATURE custom tubing
packs. Previously, AVECOR had sold filters from other manufacturers as part of
its custom tubing packs.
 
    SILICONE MEMBRANE OXYGENATOR LINE.  AVECOR's solid silicone membrane
oxygenator line consists of AVECOR's solid silicone membrane oxygenator and
associated cardiotomy reservoirs and AVECOR's ECMO (extracorporeal membrane
oxygenation) devices. This product line was purchased by AVECOR from the
Predecessor Business.
 
    AVECOR's solid silicone membrane oxygenators allow gases to pass to and from
blood using proprietary silicone membrane technology, as opposed to the most
widely used oxygenators that use microporous membrane technology (including the
AFFINITY oxygenator). The solid silicone membrane technology permits, and may be
sold for, extended use applications because it does not experience the
performance deterioration over a longer period of use that occurs in a
microporous membrane oxygenator. In addition, some perfusionists continue to
prefer silicone membrane oxygenators for heart/lung bypass procedures. AVECOR
believes that its solid silicone membrane oxygenator is the only oxygenator
which is approved for sale for extended use of periods greater than 24 hours,
providing AVECOR with a
 
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competitive advantage in this relatively small market. AVECOR markets a full
line of solid silicone membrane oxygenators in several models and sizes.
 
    AVECOR's solid silicone membrane oxygenator is also part of AVECOR's ECMO
system. ECMO is the long-term cardiopulmonary support of premature infants,
newborns, and other patients with life-threatening respiratory disorders. The
ECMO system includes the membrane oxygenator, reservoir bladder bags, and a heat
exchanger.
 
    MYOTHERM CARDIOPLEGIA DELIVERY SYSTEM.  AVECOR's MYOTHERM cardioplegia
delivery system is used to infuse specially formulated solutions, which often
include oxygenated blood, directly into the patient's coronary arteries while
the heart is stopped during heart/lung bypass surgery. In addition to delivering
nutrients to the heart, these solutions are also used to arrest the heart and
maintain prescribed temperatures. AVECOR believes that the MYOTHERM cardioplegia
delivery system provides superior levels of heat exchange performance for
optimum temperature control during both the cooling and warming phases of
heart/lung bypass surgery. The MYOTHERM cardioplegia delivery system also offers
adaptability and convenience for varying cardioplegia techniques used by
cardiovascular surgeons. The perfusionist is able to specify mixtures of
cardioplegia solutions and blood in the MYOTHERM cardioplegia delivery system
without changing the pump set-up. AVECOR released its MYOTHERM cardioplegia
delivery system worldwide in October 1991.
 
    In July 1997, AVECOR received marketing clearance from the FDA for an
improved MYOTHERM cardioplegia delivery system known as the MYOTHERM XP. The
MYOTHERM XP offers lower priming volume, better air handling, and a new safety
valve to prevent an air pressure induced failure of the MYOTHERM XP while
retaining all the other advantages of the predecessor MYOTHERM cardioplegia
delivery system.
 
    ONCOURSE-REGISTERED TRADEMARK- CONTINUOUS QUALITY CONTROL IMPROVEMENT
SOFTWARE.  In addition to AVECOR's medical device products, AVECOR introduced
its ONCOURSE continuous quality improvement (CQI) manager in December 1995. This
Microsoft Windows-Registered Trademark--based software program is currently
offered free of charge to customers who make a major commitment to AVECOR's
products. ONCOURSE CQI Manager guides perfusionists through the necessary steps
in establishing a CQI program. In addition, it generates a variety of useful
reports for perfusionists, including the annual American Board of Cardiovascular
Perfusion clinical activity report and several other specialized reports.
 
    In March 1997, AVECOR released ONCOURSE II, an improved version of its
original ONCOURSE CQI software. The major improvements for ONCOURSE II include
upgraded report generation capabilities, user-defined study parameters, tracking
of blood usage during procedures, and a benchmarking utility to compare the host
hospital data to aggregate data from other hospitals via online communications.
Further improvements and upgrades are planned for 1998. Although AVECOR markets
this product for sale to other customers, AVECOR does not expect that this
product will contribute significantly to its results of operations in the
foreseeable future.
 
RESEARCH AND DEVELOPMENT
 
    AVECOR's research and development strategy encompasses continuing the
development of a complete line of products for the heart/lung bypass circuit,
ensuring that existing products are enhanced or replaced, based on changing on
market conditions and developing products that address new markets and
opportunities outside of the heart/lung bypass market and that leverage AVECOR's
core technologies and expertise.
 
    As an integral part of both its research and development and sales and
marketing strategies, AVECOR strives to involve its customers to a large extent
in its product development activities. Under confidentiality agreements, AVECOR
consults with selected customers from time to time as to market needs and
assessments of products under development by AVECOR. AVECOR believes that this
practice
 
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allows it to receive end-user assessments of products in development at an early
stage and to better assure market acceptance.
 
    AVECOR's research and development staff consisted of approximately 24
full-time engineers, scientists, designers, and technicians as of December 31,
1997. Research and development expenses in 1997 were $3,902,000, as compared
with $3,651,000 in 1996 and $2,773,000 in 1995.
 
MARKETING
 
    AVECOR markets its products in the United States and internationally, with
domestic sales accounting for 59%, 59%, and 58% of consolidated net sales in
1997, 1996, and 1995, respectively. The majority of AVECOR's international sales
are in Europe.
 
    To serve the U.S. market, AVECOR has developed a sales organization that
markets its products directly to cardiovascular surgeons, perfusionists,
neonatologists, and ECMO specialists. This organization consists of a staff of
17 direct sales employees and is supplemented by seven independent sales
representative organizations, all with cardiovascular sales experience. This
network is managed by four regional sales managers and a vice president of
marketing and sales. At its inception, AVECOR marketed its products primarily
through distributors and independent sales representatives. Since that time,
AVECOR has shifted the composition of its distribution network in the United
States to its current direct sales organization. Approximately 93% of AVECOR's
U.S. sales in 1997 occurred through direct sales employees and independent sales
representatives. AVECOR believes that this shift to a larger direct sales force
allows better control of the sales process and assists AVECOR in developing
closer relationships with its customers.
 
    Internationally, AVECOR sells its products through 38 cardiovascular
distributors who cover most major foreign markets. AVECOR's U.K. subsidiary,
AVECOR Ltd., is the base of AVECOR's international marketing efforts, and
manufactures, assembles, and distributes AVECOR's products to the majority of
AVECOR's international distribution network. This international distribution
network is managed by an international sales director and an export sales
manager, both of whom are experienced in marketing heart/lung bypass devices in
Europe. AVECOR's international distribution network is supplemented by seven
direct sales employees, three in the U.K., two in France, and two in Canada. In
October 1995, AVECOR opened a sales office in France, which is organized as a
subsidiary of AVECOR Ltd. Total export sales from the U.S. to unaffiliated
entities (primarily to Europe and Asia and payable in U.S. dollars) and sales
made by AVECOR Ltd. were $4,952,000 and $14,230,000, respectively, for the year
ended December 31, 1997; $4,912,000 and $13,111,000, respectively, for the year
ended December 31, 1996; and $3,480,000 and $10,702,000, respectively, for the
year ended December 31, 1995.
 
    AVECOR currently has written agreements with 21 of its independent sales
representatives and international distributors. These agreements generally
impose geographic exclusivity and noncompetition obligations on AVECOR's
independent sales representatives and distributors. AVECOR's sales
representative agreements typically include a provision that requires AVECOR to
pay a commission to the sales representative for any sales made directly by
AVECOR to customers within such sales representative's or distributor's
territory. Distributor agreements generally do not require AVECOR to pay
commissions. AVECOR may typically terminate these agreements upon breach of the
agreement by the distributor or sales representative, including breach of the
quota or minimum sales obligations imposed by the agreement, as well as certain
extraordinary events. In addition to these written agreements, AVECOR has verbal
arrangements with 17 other international distributors. While AVECOR generally
considers its relationships with its distributors and sales representatives to
be good, the announcement of the Merger with Medtronic may have an adverse
impact on AVECOR's sales of products through certain of its distributors and
sales representatives. The impact of this announcement on AVECOR's relationships
with its distributors could ultimately have a material, adverse impact on
AVECOR's business, financial condition, and
 
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results of operations during the pendancy of the Merger or if the Merger is not
consummated for any reason.
 
    AVECOR's products are primarily sold to hospitals that perform heart/lung
bypass procedures. In the United States, AVECOR believes there are approximately
1,000 hospitals at which heart/lung bypass procedures are performed, while in
Europe approximately 400 hospitals perform such procedures. There are
approximately 118 hospitals worldwide where ECMO is performed. AVECOR's products
are used by perfusionists, and AVECOR estimates that there are about 3,000
perfusionists practicing in the United States.
 
    A small portion of AVECOR's business is subject to longer term (longer than
one year) commitments with customers. These commitments involve fixed pricing
terms and minimum or exclusive purchase obligations. Many of AVECOR's
competitors, which have greater financial resources and broader and
longer-standing product lines than AVECOR, have experienced relatively greater
success in establishing these types of customer commitments. AVECOR anticipates
that there will be increased use of these longer term, firm commitment
arrangements in its markets due to cost concerns and other factors.
 
    AVECOR's sales and marketing strategy includes developing and maintaining a
close working relationship with its customers in order to assess and satisfy
their needs for products and services. AVECOR meets with certain designated
customers several times each year, during which ideas are shared regarding the
marketplace in general, specific products, products under development and
existing or proposed programs. In lieu of expensive advertising and promotional
materials, AVECOR maintains extensive contact with its customers for the purpose
of educating them in AVECOR's technologies and manufacturing methods as well as
to receive input and feedback about AVECOR's product development and customer
service functions. AVECOR believes these efforts to be cost-effective in
producing awareness of, and loyalty to, AVECOR's products.
 
    AVECOR conducts frequent training of its sales force to facilitate response
to customer needs. AVECOR also maintains a 24-hour/day assistance program in
order to respond quickly to clinical questions and problems encountered by its
customers. The assistance services are provided by a former certified clinical
perfusionist employed by AVECOR and are supplemented by other certified clinical
perfusionists employed by AVECOR as well as a network of perfusionist
consultants located across the country.
 
    No single customer accounted for more than 10% of AVECOR's 1997 net sales.
 
COMPETITION
 
    The cardiovascular device market in which AVECOR competes is characterized
by intense competition. This market is dominated by established manufacturers
that have broader product lines, greater distribution capabilities,
substantially greater capital resources, and larger marketing, research, and
development staffs and facilities than AVECOR. Many of these competitors offer
broader product lines within the specific heart/lung bypass product market
and/or in the general field of medical devices and supplies. Broader product
lines give many of AVECOR's competitors the ability to negotiate exclusive,
long-term medical device supply contracts and, consequently, the ability to
offer comprehensive pricing of their competing products. By offering a broader
product line in the general field of medical devices and supplies, competitors
may also have a significant advantage in marketing competing products to group
purchasing organizations, health maintenance organizations, and other
managed-care organizations that increasingly seek to reduce costs through
centralization of purchasing functions. In addition, AVECOR's competitors
continue to use price reductions to preserve market share in the oxygenator and
other product markets. Therefore, AVECOR must present competitive product
pricing when required to protect or improve its market share in certain key
areas. There can be no assurance that AVECOR's competitors will not use more
significant and more prolonged price competition across AVECOR's product lines
in the future.
 
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<PAGE>
    During 1995 and 1996, one of AVECOR's competitors, the Bentley Division of
Baxter Healthcare Corporation, purchased three companies which provide contract
perfusion services to hospitals. AVECOR believes that control of contract
perfusion groups by its competitors will continue to have a negative impact on
AVECOR's ability to market its products to such groups or to hospitals or other
medical providers that contract with competitor-controlled groups for perfusion
services, and could have a material adverse effect on AVECOR's business,
financial condition, and results of operation. This forward-looking statement is
subject to the degree of control exerted by AVECOR's competitors with respect to
purchasing decisions made by controlled groups of perfusionists, the extent of
future acquisitions of contract perfusion groups by AVECOR's competitors, the
breadth of AVECOR's product offerings relative to those competitors controlling
contract perfusion groups, and the degree to which AVECOR's research and
development and marketing efforts result in the successful commercialization of
products with enhanced or superior performance characteristics.
 
    AVECOR's primary competitors within the heart/lung bypass market include
COBE Cardiovascular Inc. (a subsidiary of Gambro, Inc.), Medtronic, the Bentley
Division of Baxter Healthcare Corporation, C.R. Bard Inc., Sorin Biomedical,
Inc., Terumo Medical Corporation, and SARNS Inc. (a subsidiary of 3M Company).
 
    AVECOR believes that the principal competitive factors in the market for
heart/lung bypass and long-term respiratory support products are product
performance, quality, price, ease of use, technical innovation,
cost-effectiveness, field sales support, customer service, and breadth of
product line. AVECOR intends to continue to compete on the basis of its high
performance products, innovative technologies, cost-effective manufacturing
techniques, close customer relations and support, and its strategy to increase
and enhance, as dictated by market conditions, its offerings of products within
the heart/lung bypass circuit and other medical device technologies.
 
MANUFACTURING
 
    AVECOR manufactures oxygenators and other products and assembles custom
tubing packs at its U.S. facility located in Minneapolis, Minnesota. AVECOR also
performs certain final manufacturing processes with respect to its oxygenators
and blood reservoirs and assembles SIGNATURE custom tubing packs at its
Bellshill, Scotland facility.
 
    AVECOR's U.K. and U.S. manufacturing facilities have been inspected by the
British Standards Institute ("BSI") and, as a result, AVECOR has received ISO
9001 certification. BSI is also the "Notified Body" that has verified that
AVECOR's quality certification procedures conform with the essential
requirements necessary for AVECOR to prepare a Declaration of Conformity and
therefore place the "CE" mark on its products. See "Information Regarding
AVECOR--Governmental Regulation."
 
    As a part of the development process for new products, AVECOR simultaneously
designs and develops manufacturing processes and equipment to be used to
manufacture the products. Because of AVECOR's ability to design and produce its
manufacturing equipment internally in conjunction with new product development,
AVECOR has been able to implement a highly automated, cost-efficient
manufacturing process for the products in its AFFINITY line.
 
    AVECOR manufactures its oxygenators, blood pump, blood reservoirs, and
ancillary products from standard raw materials, components, and custom
manufactured components presently purchased from outside suppliers. AVECOR
intends to continue to purchase these raw materials, components, and custom-
manufactured components from outside suppliers in the future. While AVECOR
believes that the raw materials, components, and custom manufactured components
used in the manufacture of its products are readily available from multiple
sources, certain of these items are purchased from single sources. Although
AVECOR has qualified, or is in the process of investigating, alternate sources
of supply for key components and materials, any significant interruption in
supply of these items could have a material
 
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<PAGE>
adverse effect on AVECOR's ability to manufacture its products. AVECOR has not
experienced shortages or significant delays in supply of these materials and
components from its suppliers.
 
GOVERNMENTAL REGULATION
 
    AVECOR's products, development activities, and manufacturing processes are
subject to regulation by numerous governmental authorities, principally the FDA
and corresponding foreign agencies. In the United States, the FDA administers
the Federal Food, Drug and Cosmetics Act and amendments thereto, including the
Safe Medical Devices Act of 1990. AVECOR is subject to the standards and
procedures with respect to manufacture and marketing of medical devices
contained in the Federal Food, Drug and Cosmetics Act and the regulations
promulgated thereunder and is subject to inspection by the FDA for compliance
with such standards and procedures. Noncompliance with applicable requirements
can result in, among other things, fines, injunctions, civil penalties, recall
or seizure of products, total or partial suspension of production, failure of
the government to grant premarket clearance or premarket approval for devices,
withdrawal of marketing approvals and criminal prosecution.
 
    In the United States, medical devices are classified into one of three
classes (class I, II or III), on the basis of the controls deemed necessary by
the FDA to reasonably assure their safety and effectiveness. Under FDA
regulations, class I devices are subject to general controls (e.g., labeling,
premarket notification, and adherence to good manufacturing practices) and class
II devices are subject to general and special controls (e.g., performance
standards, postmarket surveillance, patient registries, and FDA guidelines ). In
general, class III devices (e.g., life-sustaining, life-supporting, and
implantable devices, or new devices that have not been found substantially
equivalent to a legally marketed device), in addition to being subject to
general and special controls, must receive premarket approval ("PMA") by the FDA
to ensure their safety and effectiveness.
 
    Before a new or significantly modified device can be introduced into the
market, the manufacturer must generally obtain marketing clearance through a
510(k) notification or approval of a PMA application. A 510(k) clearance will be
granted if the proposed device is "substantially equivalent" to a predicate
device (I.E., a legally marketed class I or class II medical device, or a class
III medical device for which the FDA has not called for the submission of a PMA
application). Commercial distribution of a device for which a 510(k)
notification is required can begin only after the FDA issues a written
determination that the device is "substantially equivalent" to a predicate
device. The FDA may determine that a proposed device is not substantially
equivalent to a predicate device, or that additional information or data are
needed before a substantial equivalence determination can be made. A request for
additional data may require that clinical studies of the device's safety and
efficacy be performed. The process of obtaining a 510(k) clearance typically can
take several months to a year or longer.
 
    A PMA application must be filed if a proposed device is not substantially
equivalent to a legally marketed class I or class II device, or if it is a class
III device for which the FDA has called for a PMA application. Certain class III
devices that were on the market before May 28, 1976 ("preamendments class III
devices"), and devices that are substantially equivalent to them, can be brought
to market through the 510(k) process until the FDA calls for the submission of
PMA applications for preamendments class III devices.
 
    The process of obtaining a PMA can be expensive, uncertain, and lengthy,
frequently requiring anywhere from one to several years from the date the PMA is
submitted to the FDA, if approval is obtained at all. Moreover, a PMA
application, if granted, may include significant limitations on the indicated
uses for which a product may be marketed. FDA enforcement policy strictly limits
the marketing of approved medical devices for unapproved or "off label" uses. In
addition, product approvals can be withdrawn for failure to comply with
regulatory standards or the occurrence of unforeseen problems following initial
marketing. All of AVECOR's current products have been the subject of successful
510(k)
 
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submissions, and AVECOR believes that its products currently in development will
also be eligible for the 510(k) submission process, although there can be no
assurance that the FDA will agree with this view.
 
    Certain of AVECOR's products are within product categories set forth in an
FDA order dated August 14, 1995, issued to all manufacturers of these devices,
which requires all of such manufacturers to submit additional data to the FDA
regarding the safety and the efficacy of the identified devices. The products
affected include AVECOR's blood oxygenators, arterial filters, and defoamers,
which, by current FDA interpretation, include both cardiotomy and venous blood
reservoirs. Each of these devices is currently classified by the FDA as a class
III medical device which, because it was viewed as substantially equivalent to
preamendments class III devices, was cleared for marketing through the 510(k)
premarket notification process. Through its August 14, 1995 order, the FDA has
requested data from AVECOR and other manufacturers of these devices in order to
make a determination as to whether these products should be reclassified as
either class I or class II medical devices. If the FDA were to determine that
such devices should remain classified as class III medical devices, it would
require manufacturers such as AVECOR to submit PMA applications concerning such
devices within 90 days after the final FDA classification order.
 
    AVECOR has gathered the required data for submission to the FDA, and is
working with various industry groups and the FDA to seek reclassification of
these devices. Although the FDA order requiring the submission of data on blood
oxygenators and arterial filters has characterized these devices as having a
high potential for down-classification, and AVECOR believes that the devices
will be reclassified, there can be no assurance that these devices will be
reclassified. Although the FDA order requesting data on defoamers has
characterized these devices as unlikely to be reclassified, and, therefore,
likely to require PMA submission, AVECOR is currently working to seek
down-classification. AVECOR's efforts, in conjunction with those of other
manufacturers, are based on the belief that the types of blood reservoirs
currently used in heart/lung bypass circuits are significantly different from
the defoamers used with older, bubble-type oxygenators, and based on safety and
efficacy data, should be reclassified. While there can be no assurance that
these efforts will be successful, AVECOR believes that the likelihood of
reclassification of blood reservoirs is currently greater than indicated in the
FDA order. Reclassification data on all of the affected products was submitted
to the FDA for review on February 13, 1998. In the event that any of the devices
are not reclassified, AVECOR and its competitors may be required to submit a PMA
application. During the gathering and submission of data for any such PMA
application and throughout the FDA review of this information, AVECOR and its
competitors would most likely be allowed to continue marketing their products.
As discussed above, the PMA application process can be expensive, uncertain, and
lengthy, and, if required, could have a material adverse effect on AVECOR's
future business, financial condition or results of operations.
 
    AVECOR is also subject to regulation in each of the foreign countries in
which it sells its products with regard to product standards, packaging
requirements, labeling requirements, import restrictions, tariff regulations,
duties, and tax requirements. Many of the regulations applicable to AVECOR's
products in such countries are similar to those of the FDA. The national health
or social security organizations of certain of such countries require AVECOR's
products to be qualified before they can be marketed in those countries. AVECOR
relies on its independent distributors and AVECOR regulatory personnel, in
countries where AVECOR has employed direct sales personnel, to comply with the
majority of the foreign regulatory requirements. To date, AVECOR has not
experienced significant difficulty in complying with these regulations.
 
    AVECOR is subject to periodic inspections by the FDA, which is charged with
auditing AVECOR's compliance with quality assurance systems established by the
FDA and other applicable government standards. AVECOR is also subject to
inspections by the United Kingdom's Medical Devices Directorate ("MDD") and
other European regulatory agencies. Strict regulatory action may be initiated in
response to audit deficiencies or to product performance problems. AVECOR
believes that its manufacturing and quality control procedures are in compliance
with the requirements of the FDA and MDD regulations.
 
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AVECOR's manufacturing facilities and processes are also subject to periodic
inspection and review by BSI in conjunction with AVECOR's ISO 9001
certification. ISO certification is a series of standards that define the basics
of establishing, documenting, and maintaining an effective production quality
management system. AVECOR believes that ISO certification creates value for
AVECOR both internally, by providing an objective criteria for measuring
AVECOR's quality assurance efforts, and externally, through customer recognition
of, and demand for, products manufactured by ISO certified manufacturers.
 
    BSI is also the "Notified Body" that has verified that AVECOR's quality
certification procedures conform with the "essential requirements" set forth by
the MDD for the class of products produced by AVECOR. Conformity with these
essential requirements enables AVECOR to prepare a Declaration of Conformity
which supports the placement of the "CE" mark on AVECOR's products. The CE mark
enables AVECOR's products to be marketed, sold, and used throughout the European
Union (the "EU"), subject to limited "safeguard" powers of member states.
Beginning in June 1998, all of AVECOR's products (and those of its competitors)
are required to comply with the essential requirements in order to be marketed
in the EU.
 
    The financial arrangements through which AVECOR markets, sells, and
distributes its products may be subject to certain federal and state laws as
well as regulations in the United States with respect to the provision of
services or products to patients who are Medicare or Medicaid beneficiaries. The
"fraud and abuse" laws and regulations prohibit the knowing and willful offer,
payment or receipt of anything of value to induce the referral of Medicare or
Medicaid patients for services or goods. In addition, the physician
anti-referral laws prohibit the referral of Medicare or Medicaid patients for
certain "Designated Health Services" to entities in which the referring
physician has an ownership or compensation interest. Violations of these laws
and regulations may result in civil and criminal penalties, including
substantial fines and imprisonment. In a number of states, the scope of fraud
and abuse or physician anti-referral laws and regulations, or both, have been
extended to include the provision of services or products to all patients,
regardless of the source of payment, although there is variation from state to
state as to the exact provisions of such laws or regulations. In other states,
and, on a national level, several health care reform initiatives have been
proposed which would have a similar impact. AVECOR believes that its operations
and its marketing, sales, and distribution practices currently comply in all
respects with all current fraud and abuse and physician anti-referral laws and
regulations, to the extent they are applicable. Although AVECOR does not believe
that it will need to undertake any significant expense or modification to its
operations or its marketing, sales, and distribution practices to comply with
federal and state fraud and abuse and physician anti-referral regulations
currently in effect or proposed, financial arrangements between manufacturers of
medical devices and other health care providers may be subject to increasing
regulation in the future. Compliance with such regulation could adversely affect
AVECOR's marketing, sales, and distribution practices, and may affect AVECOR in
other respects not presently foreseeable, but which could have a material
adverse impact on AVECOR's business, financial condition, and results of
operations.
 
THIRD-PARTY REIMBURSEMENT AND COST CONTAINMENT
 
    AVECOR's products are purchased by hospitals and other users, which then
bill various third-party payors for the health care products and services
provided to the patients. These payors, which include Medicare, Medicaid,
private insurance companies, and managed care organizations, reimburse part or
all of the costs and fees associated with the procedures performed with these
devices.
 
    Medicare and Medicaid reimbursement for hospitals is based on a fixed amount
for admitting a patient with a specific diagnosis. Because of this fixed
reimbursement method, hospitals have incentives to use less costly methods in
treating Medicare and Medicaid patients, and will frequently make capital
expenditures to take advantage of less costly treatment technologies.
Frequently, reimbursement is reduced to reflect the availability of a new
procedure or technique and, as a result, hospitals are generally willing to
implement new cost saving technologies before these downward adjustments take
effect.
 
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<PAGE>
Likewise, because the rate of reimbursement for certain physicians who perform
certain procedures has been, and may in the future be, reduced in the event of
further changes in the resource-based relative value scale method of payment
calculation, physicians may seek greater cost efficiency in treatment to
minimize any negative impact of reduced reimbursement. Any amendments to
existing reimbursement rules and regulations which restrict or terminate the
reimbursement eligibility (or the extent or amount of coverage) of medical
procedures using AVECOR's products or the eligibility (or the extent or amount
of coverage) of AVECOR's products could have a material adverse impact on
AVECOR's business, financial condition, and results of operations.
 
    In response to the focus of national attention on rising health care costs,
a number of changes to reduce costs have been proposed or have begun to emerge.
There have been, and may continue to be, proposals by legislators and regulators
and third-party payors to curb these costs. There has also been a significant
increase in the number of Americans enrolling in some form of managed care plan,
and more than 80% of hospitals participate in or have agreements with HMOs. It
has become a typical practice for hospitals to affiliate themselves with as many
managed care plans as possible. Higher managed care penetration typically drives
down the prices of health care procedures, which in turn places pressure on
medical supply prices. This causes hospitals to implement tighter vendor
selection and certification processes, by reducing the number of vendors used,
purchasing more products from fewer vendors and trading discounts on price for
guaranteed higher volumes to vendors. Hospitals have also sought to control and
reduce costs over the last decade by joining group purchasing organizations or
purchasing alliances. AVECOR cannot predict what continuing or future impact
existing or proposed legislation, regulation or such third-party payor measures
may have on its future business, financial condition or results of operations.
 
    Because the primary application of AVECOR's products is in coronary bypass
procedures, changes in reimbursement policies and practices of third-party
payors with respect to coronary bypass surgery could have a substantial and
material adverse impact on sales of AVECOR's heart/lung bypass products. The
development or increased use of more cost-effective treatments for coronary
artery disease could cause such payors to decrease or deny reimbursement for
coronary bypass surgery or to favor these other treatments.
 
PATENTS AND PROPRIETARY RIGHTS
 
    AVECOR protects its technology by filing patent applications for the
patentable technologies that it considers important to the development of its
business. AVECOR also relies upon trade secrets, know-how, and continuing
technological innovations to develop and maintain its competitive position.
 
    AVECOR currently holds eight U.S. patents and has three pending U.S. patent
applications. In addition, AVECOR has eight pending foreign patent applications.
Four of AVECOR's present U.S. patents cover significant design features of the
AFFINITY oxygenator, including the AFFINITY oxygenator's winding mandrel,
graduated density fiber bundle, and heat exchanger water diverter. AVECOR's
other issued U.S. patents cover the designs of the AFFINITY venous blood
reservoirs and AFFINITY arterial filter. Also, AVECOR owns a patent relating to
the use of its silicone membrane for cell culture applications. AVECOR has
pending U.S. patent applications relating to additional features of the AFFINITY
venous blood reservoir, the AFFINITY arterial filter, and its improved MYOTHERM
XP cardioplegia heat exchanger. AVECOR's pending foreign patent applications
consist of selected overseas filings addressing the same intellectual property
addressed by AVECOR's issued and pending U.S. patents.
 
    The three U.S. patents acquired by AVECOR from the Predecessor Business
cover AVECOR's solid silicone membrane oxygenator product line and have expired.
AVECOR believes that the market for solid silicone membrane oxygenators might
not be large enough to justify the expenses associated with market entry by a
competitor, and therefore, the effect of the expiration of these patents on the
revenues of AVECOR will not be material.
 
                                       62
<PAGE>
    AVECOR, like other firms that engage in the development and marketing of
medical technology products, must address issues and risks relating to patents
and trade secrets. There can be no assurance that any of AVECOR's pending or
future U.S. or foreign patent applications will result in issued patents, that
any current or future U.S. or foreign patents of AVECOR will not be challenged
or circumvented by competitors or others, or that such patents will be found to
be valid or sufficiently broad to protect AVECOR's technology or provide AVECOR
with its desired competitive advantage. The validity and breadth of claims
covered in medical technology patents involve complex legal and factual
questions and therefore may be highly uncertain. AVECOR may be required to
institute litigation to enforce patents issued to AVECOR or to determine the
enforceability, scope, and validity of the proprietary rights of others.
 
    AVECOR also relies on trade secrets and proprietary know-how that it seeks
to protect, in part, through confidentiality agreements with employees,
consultants and other parties. There can be no assurance that these agreements
will not be breached, that AVECOR will have adequate remedies for any breach, or
that AVECOR's trade secrets will not otherwise become known to or independently
developed by competitors.
 
    Claims by competitors and other third parties that AVECOR's products
allegedly infringe the patent rights of others could have a material adverse
effect on AVECOR. The medical device industry is characterized by frequent and
substantial intellectual property litigation. Intellectual property litigation
is complex and expensive, and the outcome of such litigation is difficult to
predict.
 
    In March 1997, AVECOR filed a suit in U.S. District Court for the District
of Minnesota, seeking to invalidate a newly issued U.S. patent held by Minntech
Corporation ("Minntech"), a competing manufacturer of blood oxygenators and
other medical devices, and requesting a determination that AVECOR's AFFINITY
oxygenator does not infringe the Minntech patent. AVECOR filed the suit in
response to a December 1996 letter from Minntech, alleging that the AFFINITY
oxygenator infringes certain claims under Minntech's patent, and requesting
discussion regarding a possible license agreement. On October 6, 1997, the
Magistrate Judge of the United States District Court vacated a previous order
and granted a stay in the proceedings, including the suspension of discovery,
pending the outcome of Minntech's request for re-issuance of the aforementioned
patent.
 
    AVECOR's action against Minntech and any future litigation, regardless of
outcome, could result in substantial expense to AVECOR and significant diversion
of the efforts of AVECOR's technical and management personnel. In addition, if
Minntech were successfully to bring an infringement counterclaim against AVECOR,
or if AVECOR were to be subject to an adverse determination in any other legal
proceeding in the future alleging patent infringement, AVECOR could become
subject to an injunction preventing the manufacture and sale of the infringing
products and to monetary damages, or might be forced to seek a license from the
party alleging patent infringement in order to continue to manufacture and sell
any infringing products, which it might not be able to obtain. The outcome of
any such legal action, including the possibility of entering into such a
license, could have a material adverse effect on AVECOR's business, financial
condition, and results of operations.
 
    Pursuant to an Asset Purchase Agreement dated June 7, 1991 ("Asset Purchase
Agreement"), for approximately $1 million in cash and a $2.5 million note,
AVECOR acquired the business and assets, and assumed certain liabilities, of the
Predecessor Business. In addition, under the terms of a Royalty Agreement also
dated June 7, 1991 ("Royalty Agreement"), AVECOR is obligated to pay to SCIMED
Life Systems, Inc. ("SCIMED") specified royalties based on a percentage of net
sales (as defined) of products previously manufactured by the Predecessor
Business and future products developed from then-existing technology if AVECOR
achieves certain net sales thresholds with those products. The Royalty Agreement
also provides for royalty payments on certain new generations of developed
products, if any, that use certain technology embodied in the then-existing
models of such products. In June 1996, the Royalty Agreement expired with
respect to products previously manufactured by the Predecessor Business
 
                                       63
<PAGE>
and expires with respect to current products under development at the time of
the acquisition and certain new generation products in June 2001. AVECOR has
charged $95,000 in 1996 and $178,000 in 1995 to operations for royalties due
under the Royalty Agreement for sales of products previously manufactured by the
Predecessor Business. No related royalty amounts accrued in 1997. AVECOR
believes that none of the products in the AFFINITY line nor any of AVECOR's
products currently under development (including the products with the TRILLIUM
coating applied) will require royalty payments under the Royalty Agreement.
 
    In connection with the Asset Purchase Agreement, SCIMED also assigned to
AVECOR 10 trademarks (one of which is registered) related to AVECOR's current
line of products previously manufactured by the Predecessor Business.
 
    AVECOR also entered into a royalty agreement in connection with AVECOR's
acquisition of an exclusive license to market the AFFINITY blood pump. The
agreement requires AVECOR to make payments based on net sales of the pump
chamber (the disposable portion of the AFFINITY blood pump system) and net
profits of the pump console (the equipment portion of the AFFINITY blood pump
system) through August 2002. The term of the agreement may be extended by AVECOR
until the expiration of the last to expire of the patents covered by this
agreement or the useful life of the know-how (as defined) licensed, whichever is
longer. Under the terms of the agreement, AVECOR is required to pay minimum
royalties each year. AVECOR incurred royalties of $55,000 for the year ended
December 31, 1997, which amount exceeded the minimum royalty related to the
first year of the royalty agreement.
 
    AVECOR also has use of an exclusive license allowing it to apply its
TRILLIUM bio-passive surface to its products. The agreement requires AVECOR to
make quarterly payments based on a percentage of net sales of products utilizing
the bio-passive surface. AVECOR can retain exclusivity of the license if it pays
minimum annual royalties. AVECOR incurred royalties of $35,000 for the year
ended December 31, 1997 under this agreement.
 
EMPLOYEES
 
    As of December 31, 1997, AVECOR employed 339 persons full-time including 29
in research and development, 223 in manufacturing, 53 in sales and marketing,
and 34 in general and administrative functions. AVECOR's employees are not
represented by a union, and AVECOR considers its relationship with its employees
to be good.
 
                                       64
<PAGE>
                 SELECTED CONSOLIDATED FINANCIAL DATA OF AVECOR
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
    The selected consolidated financial data as of and for the years ended
December 31, 1993, 1994, 1995, 1996 and 1997 of AVECOR has been derived from
financial statements of AVECOR audited by PricewaterhouseCoopers LLP,
independent accountants, and should be read in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations of
AVECOR" included elsewhere in this Proxy Statement/Prospectus.
 
    The selected unaudited consolidated financial data presented below as of and
for the six-month periods ended June 30, 1997 and 1998 have been prepared by
AVECOR and are derived from the unaudited consolidated financial statements of
AVECOR included and incorporated by reference in this Proxy
Statement/Prospectus. In the opinion of AVECOR's management, the unaudited
interim consolidated financial statements include all adjustments (consisting
only of normal recurring adjustments) necessary for a fair presentation of the
consolidated operating results and financial position of AVECOR as of and for
the unaudited periods described above. The results of operations for AVECOR for
the six-month period ended June 30, 1998 are not necessarily indicative of the
results of operations that may be expected for the entire fiscal year ending
December 31, 1998.
<TABLE>
<CAPTION>
                                                  SIX MONTHS ENDED
                                                      JUNE 30                        YEARS ENDED DECEMBER 31
                                                --------------------  -----------------------------------------------------
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                  1998       1997       1997       1996       1995       1994       1993
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                                    (UNAUDITED)
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>        <C>
OPERATING DATA:
  Net sales...................................  $  26,021  $  24,004  $  46,864  $  44,401  $  33,340  $  21,486  $  14,125
  Cost of sales...............................     15,437     13,960     27,574     25,986     18,180     12,556      9,067
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Gross profit..............................     10,584     10,044     19,290     18,415     15,160      8,930      5,058
Operating Expenses:
  Selling, general and administrative.........      7,883      6,832     13,428     11,885      8,727      6,779      5,044
  Litigation expense..........................     --         --         --          4,205        170     --         --
  Research and development....................      1,726      2,076      3,902      3,651      2,773      2,309      1,891
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Operating income (loss)...................        975      1,136      1,960     (1,326)     3,490       (158)    (1,877)
Interest income...............................        164        273        495        725        586        143        204
Interest expense..............................        199        176        383     --         --         --         --
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes.............        940      1,233      2,072       (601)     4,076        (15)    (1,673)
Income tax provision (benefit)................        310        443        745        (34)       780         24        (23)
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
Net income (loss)]............................  $     630  $     790  $   1,327  $    (567) $   3,296  $     (39) $  (1,650)
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
Diluted earnings (loss) per share.............  $     .08  $     .10  $     .17  $    (.07) $     .45  $    (.01) $    (.26)
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
Weighted average common and common equivalent
  shares outstanding(1).......................      8,029      7,979      7,990      7,767      7,353      6,390      6,361
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
BALANCE SHEET DATA:
  Working capital.............................  $  19,974  $  19,776  $  20,204  $  20,563  $  26,247  $  10,150  $   9,725
  Total assets................................     46,049     44,363     42,759     37,161     33,519     15,877     15,031
  Long-term debt..............................      4,632      4,823      4,694     --         --         --         --
  Shareholders equity.........................  $  33,445     31,350     32,618     29,938     29,322     13,145     12,970
</TABLE>
 
- ------------------------
 
(1) Weighted average common and common equivalent shares outstanding are
    calculated according to the definitions of "diluted earnings per share" as
    defined by the Financial Accounting Standards Board (FASB) in Statement on
    Financial Accounting Standards No. 128, "Earnings per Share." All periods
    presented were prepared under this standard for computing earnings per
    share.
 
                                       65
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
            FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF AVECOR
 
    The following is a discussion of the results of operations and financial
condition of AVECOR and should be read in conjunction with AVECOR's Consolidated
Financial Statements and Notes thereto appearing elsewhere in this Proxy
Statement/Prospectus. The discussion set forth below reflects management's
discussion of historical results and trends in the business, financial
condition, and results of operations of AVECOR for periods prior to the public
announcement of the Merger. There can be no assurance that AVECOR's business,
financial condition, and results of operations will not be adversely impacted as
a result of the announcement of the Merger and, in particular, the effect of the
announcement on AVECOR's ability to sell its products through its distributors
and sales representatives.
 
RESULTS OF OPERATIONS
 
COMPARISON OF THE SIX MONTHS ENDED JUNE 30, 1998 WITH THE SIX MONTHS ENDED JUNE
  30, 1997
 
    NET SALES.  Net sales increased 8% to $26,021,000 for the six months ended
June 30, 1998 from $24,004,000 for the six months ended June 30, 1997. This
increase was primarily the result of a higher volume of product shipments of
AVECOR's SIGNATURE custom tubing pack line, AFFINITY line and the MYOTHERM
cardioplegia line. AVECOR received FDA marketing approval for its new AFFINITY
blood pump system in August 1997 and the MYOTHERM XP cardioplegia delivery
system in July 1997. These products positively influenced the comparative sales
growth. Overall, average prices of product shipments declined slightly when
compared to the corresponding period in 1997, principally due to competitive
pressures.
 
    Sales from the SIGNATURE custom tubing pack, AFFINITY and MYOTHERM
cardioplegia lines increased approximately $789,000 (16.5%), $784,000 (5.8%) and
$269,000 (13.8%), respectively, during the six months ended June 30, 1998 as
compared to the corresponding period in 1997.
 
    During the third quarter of 1997, AVECOR terminated agreements with its last
remaining United States distributor and its only Canadian distributor. These
markets are now being served by AVECOR's direct sales force. Sales in the
territories formerly represented by these distributors increased approximately
$1,200,000 in the six month period ended June 30, 1998 as compared to the
corresponding period in 1997. AVECOR cannot be certain whether revenues in these
territories will be maintained, improve or decline.
 
    Sales to customers located outside of the United States were approximately
40% and 41% of net sales for the six month periods ended June 30, 1998 and 1997,
respectively. Sales to customers located outside of the United States could be
adversely impacted in future periods as a result of the announcement of the
Merger and the effect of that announcement on AVECOR's relationships with its
distributors and sales representatives.
 
    AVECOR has continued to experience decreased sales to contract perfusion
groups controlled by certain of its competitors. Sales to contract perfusion
groups controlled by one of AVECOR's competitors decreased $458,000 to $258,000
for the six months ended June 30, 1998 from $716,000 for the six months ended
June 30, 1997. AVECOR believes that control of contract perfusion groups by its
competitors will continue to have a negative impact on AVECOR's ability to
market its products to such groups or to hospitals or other medical providers
that contract with competitor-controlled groups for perfusion services, and
could have a material adverse effect on AVECOR's business, financial condition
and results of operation. This forward-looking statement is subject to the
degree of control exerted by AVECOR's competitors with respect to purchasing
decisions made by controlled groups of perfusionists, the extent of future
acquisitions of contract perfusion groups by AVECOR's competitors, the breadth
of AVECOR's product offerings relative to those competitors controlling contract
perfusion groups, and the degree to which AVECOR's research and development and
marketing efforts result in the successful commercialization of products with
enhanced or superior performance characteristics.
 
                                       66
<PAGE>
    COST OF SALES/GROSS PROFIT.  Gross profit as a percentage of net sales
decreased 1.1% to 40.7% for the six months ended June 30, 1998 from 41.8% for
the six months ended June 30, 1997. The gross profit percentage for the
six-month period ended June 30, 1998 was unfavorably impacted by significant
increases in sales of AVECOR's lower-margin SIGNATURE custom tubing pack line as
well as competitive pricing pressures in the marketplace. The mix of products
sold in any period will influence the cost of sales and gross profit for the
period. Gross margins during the six months ended June 30, 1998 were also
negatively impacted by lower production volumes experienced late in the fourth
quarter of 1997 which continued into the first quarter of 1998.
 
    AFFINITY oxygenator product costs continued to decline due to efficiency and
material cost improvements, although these improvements were largely offset by
an ongoing decrease in average selling prices.
 
    AVECOR's future gross profit margin percentages will be influenced by the
ongoing pressures of the competitive pricing environment, changes in the sales
mix, the required levels of production, new product introductions and the extent
of further product cost improvements through increased manufacturing
efficiencies and reduced material costs, if any. Given the uncertainty
associated with new product introductions, the ultimate realization of any such
product cost improvements and the continuing price pressures characteristic of
AVECOR's markets, AVECOR cannot be certain if its gross profit margin will be
maintained, improve or decline.
 
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, general and
administrative expenses increased 15% to $7,883,000 for the six months ended
June 30, 1998 from $6,832,000 for the six months ended June 30, 1997. This
increase is primarily attributed to costs associated with the continuing
development of a direct sales force in certain of AVECOR's territories formerly
served by distributors and independent sales representatives, marketing costs
incurred for the introduction of new products, including the AFFINITY blood
pump, and increased seasonal trade show costs. Various costs associated with the
acquisition of AVECOR also contributed to the incremental increase in selling,
general and administrative expenses during the six-month period ended June 30,
1998 as compared to the corresponding period in 1997. As a percent of sales,
selling, general and administrative expenses increased to 30.3% for the
six-month period ended June 30, 1998 from 28.5% for the six-month period ended
June 30, 1997.
 
    Without considering the impact of the acquisition of AVECOR, management
anticipates that selling, general and administrative expenses for 1998 will be
higher than 1997 and will approximate 1997 levels as a percentage of sales.
These forward-looking statements will be influenced by revenue increases
achieved by AVECOR, its ability to attract and retain qualified sales personnel
as AVECOR continues to develop its direct sales force, and the timing and extent
of promotional activities associated with the AFFINITY oxygenator with TRILLIUM
bio-passive surface, the new oxygen saturation/hematocrit monitor and other new
product introductions, if any.
 
    RESEARCH AND DEVELOPMENT EXPENSES.  Research and development expenses
decreased 17% to $1,726,000 for the six months ended June 30, 1998 from
$2,076,000 for the six month period ended June 30, 1997. This decreased spending
is a result of the transition from the completion or near completion of major
projects including the AFFINITY blood pump, MYOTHERM XP and the AFFINITY
oxygenator with TRILLIUM bio-passive surface to a new generation of products
including the new oxygen saturation/hematocrit monitor.
 
    Without considering the impact of the acquisition of AVECOR, management
anticipates that research and development expenses for 1998 will approximate
1997 levels, as AVECOR continues to expand and improve its proprietary line of
disposable medical devices. This forward-looking projection is dependent upon
the extent and timing of new product development and the impact of the
regulatory process in obtaining marketing clearance for new products, including
the new oxygen saturation/hematocrit device which was submitted for approval to
the FDA near the end of the second quarter of 1998, and the extent of expenses
related to research studies commenced in an attempt to prove the clinical
efficacy and, thus, market advantage of the TRILLIUM coating. The need or desire
to modify AVECOR's existing products could
 
                                       67
<PAGE>
also influence the level of research and development expenses. There can be no
assurance, however, that AVECOR's research and development efforts will result
in any additional regulatory submissions to the FDA or will result in any
commercially successful products. The forward-looking statements regarding
anticipated regulatory submissions contained in this paragraph will be impacted
by the results of AVECOR's development efforts, the availability of any required
clinical data, any changes in the regulatory scheme for such products, and
AVECOR's assessment of the cost and anticipated benefit of such submissions.
 
    INTEREST INCOME AND EXPENSE.  Interest income decreased to $164,000 for the
six months ended June 30, 1998 from $273,000 for the six months ended June 30,
1997. This decrease in interest income is primarily due to the use of cash and
cash equivalents and investments for the purchase of manufacturing molds and
equipment and additional inventories needed to support AVECOR's new products and
revenue growth. At June 30, 1998, the majority of AVECOR's cash and cash
equivalents was invested with two investment portfolio managers who invested in
bank certificates of deposit, U.S. government securities, agency paper, money
markets, commercial paper, and corporate obligations.
 
    Interest expense for the six-month period ended June 30, 1998 was $199,000
compared to $176,000 for the six-month period ended June 30, 1997. The interest
expense was exclusively due to the mortgage on AVECOR's U.S. facility. The
closing on the facility purchase occurred in late January 1997.
 
    INCOME TAX PROVISION.  For the six-month period ended June 30, 1998, a tax
provision of $310,000 was recorded compared to $443,000 for the six-month period
ended June 30, 1997. The tax provisions recorded correspond to the pretax income
for those respective periods. These provisions vary from the statutory U.S.
federal corporate rate primarily due to losses incurred by AVECOR's French
subsidiary for which no tax benefit has been recognized because of uncertainty
of realization, partially offset by the generation of research and
experimentation credits.
 
    NET INCOME.  Net income was $630,000 or $.08 per share, on a diluted basis,
for the six-month period ended June 30, 1998, compared to $790,000 or $.10 per
share, on a diluted basis, for the six- month period ended June 30, 1997.
 
COMPARISON OF THE YEAR ENDED DECEMBER 31, 1997 WITH THE YEAR ENDED DECEMBER 31,
  1996
 
    NET SALES.  Net sales increased 6% to $46,864,000 for 1997 from $44,401,000
for 1996. This increase was principally the result of a higher volume of product
shipments of AVECOR's SIGNATURE custom tubing packs and AFFINITY product line.
Overall, average prices of product shipments declined slightly when compared to
1996.
 
    SIGNATURE custom tubing pack and the AFFINITY product line net sales
increased $2,401,000 and $697,000 from 1996, respectively. A significant portion
of the AFFINITY revenue increase was attributed to the AFFINITY blood pump which
AVECOR began marketing internationally in June 1997. AVECOR received FDA
marketing approval for this product in August 1997. These increases were
partially offset by decreases in the silicone membrane oxygenator line which
decreased by $436,000 and the MYOTHERM cardioplegia line which decreased by
$339,000. Management believed the decline in net sales of the MYOTHERM
cardioplegia line was temporary as customers delayed their purchasing decisions
in anticipation of AVECOR's launch of its new version of the MYOTHERM
cardioplegia system (MYOTHERM XP). As noted above, the MYOTHERM XP cardioplegia
system received marketing clearance from the FDA in July 1997 and was launched
both in the United States and internationally in early 1998.
 
    Sales to customers located outside of the United States were approximately
41% of consolidated net sales for 1997 and 1996.
 
    During the third quarter of 1997, AVECOR terminated agreements with its last
remaining United States distributor and its only Canadian distributor. Sales in
the territories formerly represented by these
 
                                       68
<PAGE>
distributors decreased approximately $1,400,000 in 1997 when compared to 1996.
These markets are now being served by AVECOR's direct sales force. Management's
belief that these revenue declines were temporary and caused by the transition
to a direct sales force in these territories and the depletion of product
inventories of the former distributors is supported by the previously mentioned
$1,200,000 increase in sales in these territories for the six-month period ended
June 30, 1998 compared to the same period in 1997.
 
    Although revenues from distributors in the continental European countries
and Asia increased about $800,000 during the twelve months ended December 31,
1997 when compared to the corresponding period in 1996, these distributors'
sales for the six-month period ended December 31, 1997 decreased approximately
$690,000 when compared to the six-month period ended December 31, 1996 and
decreased about $983,000 when compared to the six-month period ended June 30,
1997. During the latter half of 1997, currencies in Europe and Asia
substantially weakened relative to the U.S. dollar and the U.K. pound sterling.
AVECOR believes that these types of fluctuations in currency exchange rates
reduce demand for AVECOR's products by increasing the price of AVECOR's products
in the currency of the countries in which the product is sold.
 
    Sales to AVECOR's formerly exclusive Mexican distributor declined about
$340,000 in 1997 when compared to 1996. On October 9, 1997, AVECOR entered into
an agreement with St. Jude Medical to distribute AVECOR's products in Mexico and
in Central and South America. Previous sales in these countries were not
significant to AVECOR. The formerly exclusive Mexican distributor continues to
market AVECOR's silicone membrane product line in Mexico.
 
    The aforementioned factors impacted sales within all of AVECOR's product
lines. The revenue declines discussed above were exceeded by revenue growth in
AVECOR's other domestic and foreign markets.
 
    Sales to contract perfusion groups controlled by one of AVECOR's competitors
decreased $750,000 to $1,100,000 for 1997 from $1,850,000 for 1996.
 
    COST OF SALES/GROSS PROFIT.  Gross profit as a percentage of net sales
decreased to 41.2% for 1997 from 41.5% for 1996. The cost of sales percentage
for 1997 was unfavorably impacted by significant increases in sales of AVECOR's
lower-margin SIGNATURE custom tubing pack line, as well as competitive pricing
pressures in the marketplace. The mix of products sold in any period will
influence the cost of sales and gross profit for the period.
 
    AFFINITY oxygenator costs continued to improve due to material cost and
efficiency improvements, although these improvements were largely offset by an
ongoing decrease in average selling prices and reduced production volume,
primarily in the fourth quarter, due to lower-than-expected sales volume.
 
    SELLING, GENERAL AND ADMINISTRATIVE, AND LITIGATION EXPENSE.  Selling,
general and administrative expenses increased 13% to $13,428,000 for 1997 from
$11,885,000 for 1996. This increase is primarily attributed to costs associated
with the continuing development of a direct sales force in certain of AVECOR's
territories formerly served by distributors and independent sales
representatives and costs incurred for the introduction of new products,
including the AFFINITY blood pump. As a percent of sales, selling, general and
administrative expenses increased to 28.7% for 1997 from 26.8% for 1996.
 
    On July 17, 1996, AVECOR reached an agreement with COBE Laboratories Inc.
(COBE) to settle COBE's patent suit against AVECOR. The terms of the settlement
with COBE provided for AVECOR to make net payments totaling $2,200,000. Two net
payments of $1,100,000 were made in August 1996 and August 1997, respectively.
AVECOR recorded settlement costs and professional expenses of approximately
$4,205,000 in 1996 in connection with the COBE suit. No related expenses were
incurred for the COBE matter in 1997.
 
                                       69
<PAGE>
    RESEARCH AND DEVELOPMENT EXPENSES.  Research and development expenses
increased 7% to $3,902,000 for 1997 from $3,651,000 for 1996. This increased
research and development spending is a result of AVECOR's ongoing efforts to
pursue a number of potential and realized product opportunities including the
MYOTHERM XP, AFFINITY blood pump, the AFFINITY oxygenator with TRILLIUM
bio-passive surface and new oxygen saturation/hematocrit technology. AVECOR
received the appropriate marketing clearances from the FDA for the MYOTHERM XP,
AFFINITY blood pump and AFFINITY oxygenator with TRILLIUM bio-passive surface in
July 1997, August 1997 and February 1998, respectively.
 
    INTEREST.  Interest income decreased to $495,000 for 1997 from $725,000 for
1996. This decrease in interest income is primarily due to the use of cash and
cash equivalents and investments for AVECOR's new facility, the purchase of
manufacturing molds and equipment, additional inventories needed to support
AVECOR's new product lines and revenue growth, and the costs associated with the
COBE matter. Interest income during 1997 and 1996 was earned primarily from the
investment of the remaining net proceeds from AVECOR's June 1995 stock offering.
At December 31, 1997, the majority of these remaining net proceeds were invested
with two investment portfolio managers who invested in U.S. government
securities, agency paper, money markets, commercial paper and corporate
obligations.
 
    Interest expense for 1997 was $383,000 and exclusively due to the mortgage
on the new facility. The closing on the facility purchase occurred in late
January 1997.
 
    INCOME TAX PROVISION.  For 1997, a tax provision of $745,000 was recorded as
compared to a tax benefit of $34,000 for 1996. The 1997 and 1996 effective tax
rates differ from the normal U.S. statutory tax rate primarily due to losses
incurred by AVECOR's French subsidiary for which no tax benefit has been
recognized because of uncertainty of realization partially offset by the
generation of research and experimentation credits.
 
    NET INCOME (LOSS).  Net income was $1,327,000 or $.17 per share, on a
diluted basis, for 1997 compared to net loss of $567,000 or $.07 per share, on a
diluted basis, for 1996. The 1996 loss is primarily due to litigation and
settlement expense incurred during 1996 in connection with the COBE lawsuit,
which resulted in a charge to operations of $4,205,000.
 
COMPARISON OF THE YEAR ENDED DECEMBER 31, 1996 WITH THE YEAR ENDED DECEMBER 31,
  1995
 
    NET SALES.  Net sales increased 33% to $44,401,000 for 1996 from $33,340,000
for 1995. This increase was principally the result of a higher volume of product
shipments of AVECOR's AFFINITY product line and SIGNATURE custom tubing packs.
Overall, average prices associated with 1996 product shipments declined slightly
from those of 1995 in response to competitive pricing in the marketplace.
Selective price increases were implemented in the last half of 1996.
 
    Sales from the AFFINITY product line and SIGNATURE custom tubing packs
increased $7,159,000 and $3,943,000 from 1995, respectively. The favorable
impact of increased net sales of these product lines was partially offset by a
decrease of $276,000 in net sales of AVECOR's older solid silicone membrane
oxygenator product line.
 
    COST OF SALES/GROSS PROFIT.  Gross profit as a percentage of net sales
decreased to 41.5% for 1996 from 45.5% for 1995. The cost of sales percentage
for 1996 was unfavorably impacted by significant increases in sales of AVECOR's
lower-margin SIGNATURE custom tubing pack line, as well as competitive pricing
pressures in the marketplace.
 
    Higher production volumes continued to improve AFFINITY oxygenator product
costs, although these improvements were offset, primarily by an ongoing decrease
in average selling prices due to AVECOR being in a competitive pricing
environment. Also, optimal volume-related manufacturing efficiencies were not
achieved throughout 1996 for production of AVECOR's AFFINITY arterial filter.
Production of the AFFINITY arterial filter began on or about December 31, 1995.
 
                                       70
<PAGE>
    SELLING, GENERAL AND ADMINISTRATIVE AND LITIGATION EXPENSE.  Selling,
general and administrative expenses increased 36% to $11,885,000 for 1996 from
$8,727,000 for 1995. This increase is attributed to costs associated with the
development of a direct sales force in certain of AVECOR's territories formerly
served by distributors and independent sales representatives and the overall
increase in support needed to achieve AVECOR's sales levels. In connection with
AVECOR's development of a direct sales force, in October 1995, AVECOR opened a
sales office in France from which it fields a direct sales force to serve the
French market. AVECOR recorded non-recurring charges in the fourth quarter of
1996 associated with relocation and lease abandonment expenses in connection
with the consolidation of AVECOR's U.S. operations from four leased facilities
into one owned property and the addition and subsequent resignation of a Chief
Operating Officer.
 
    Additionally, AVECOR recorded settlement costs and professional fees of
$4,205,000 in 1996, in connection with the COBE suit, compared to $170,000 in
1995.
 
    RESEARCH AND DEVELOPMENT EXPENSES.  Research and development expenses
increased 32% to $3,651,000 for 1996 from $2,773,000 for 1995. This increased
research and development spending was a result of AVECOR's efforts to pursue a
number of potential product opportunities, including the AFFINITY blood pump.
 
    INTEREST INCOME.  Interest income increased to $725,000 for 1996 from
$586,000 for 1995. Interest income during 1996 and 1995 was earned primarily
from the investment of the remaining net proceeds from AVECOR's June 1995 stock
offering. At December 31, 1996, the majority of these remaining net proceeds was
invested with two investment portfolio managers who invested in U.S. government
securities, agency paper, money markets, commercial paper, and corporate
obligations.
 
    INCOME TAX PROVISION.  For 1996, a tax benefit of $34,000 was recorded as
compared to a tax provision of $780,000 for 1995. The 1996 effective tax rate
differs from the normal statutory tax rate primarily due to losses incurred by
AVECOR's French subsidiary for which no tax benefit has been recognized because
of uncertainty of realization partially offset by the generation of research and
experimentation credits. The 1995 tax provision reflects an effective rate which
benefited from use of previously generated net operating loss carryforwards and
research and experimentation credits.
 
    NET INCOME (LOSS).  Net loss was $567,000 or $.07 per share, on a diluted
basis, for 1996 compared to net income of $3,296,000 or $.45 per share, on a
diluted basis, for 1995. The 1996 loss was primarily due to litigation and
settlement expense incurred during 1996 in connection with the COBE lawsuit,
which resulted in a charge to operations of $4,205,000.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    For the six months ended June 30, 1998, AVECOR's operating activities
provided net cash of $2,848,000 compared to $479,000 provided by operating
activities for the same period in 1997. Net income after adjustments for
depreciation and amortization was $294,000 greater in the six months ended June
30, 1998 as compared to the same period in 1997. The net change of approximately
$2,369,000 is primarily the result of increased accounts payable balances
principally due to the timing of check runs and increased accrued expenses, and
smaller increases in inventories and accounts receivable when compared to the
six months ended June 30, 1997. These net sources of cash were partially offset
by the use of cash for increased other current assets during the six months
ended June 30, 1998.
 
    During 1997, AVECOR used $891,000 in operating activities compared to
$2,470,000 used for operating activities in 1996. The net change of $1,579,000
is primarily the result of $3,100,000 of cash usages during 1996 related to the
COBE litigation compared to $1,100,000 of cash usages during 1997, smaller
increases in levels of inventories and reduced prepaid expenses. These operating
provisions for cash were partially offset by a smaller increase in accrued
expenses in 1997 when compared to 1996, reduced accounts payable and increased
accounts receivable balances in 1997 when compared to 1996.
 
                                       71
<PAGE>
AVECOR's inventories continued to increase as a result of inventories needed to
support AVECOR's new product lines, revenue growth and, in part, as a result of
lower than anticipated shipments of the AFFINITY product line primarily in the
third and fourth quarters of 1997.
 
    AVECOR believes that its existing cash and cash equivalents and investments
as well as anticipated cash generated from operations will be sufficient to
satisfy AVECOR's cash requirements for the foreseeable future.
 
    Cash expenditures for capital additions totaled $2,090,000 for the six
months ended June 30, 1998 compared to $1,911,000 for six months ended June 30,
1997 when excluding the 1997 cash expenditures for AVECOR's U.S. facility and
related furniture, fixtures and equipment. These expenditures were primarily
related to equipment, molds and tooling necessary to further production,
increase production efficiencies, improve quality and reduce raw material costs
of the AFFINITY blood pump, MYOTHERM XP and the AFFINITY oxygenator and related
blood reservoirs. The investment in equipment for the six months ended June 30,
1998 includes $300,000 related to the AFFINITY blood pump. This pump equipment
is placed with customers in exchange for a long-term commitment to purchase
disposable products from AVECOR.
 
    For 1997, cash expenditures for capital additions, other than the purchase
of the new facility and related furniture, fixtures and equipment, totaled
$4,628,000 compared to $1,979,000 in 1996. These expenditures were primarily
related to equipment, molds and tooling necessary to begin the production and
marketing of the AFFINITY blood pump and MYOTHERM XP, and to also increase
production efficiencies and reduce raw material costs of the AFFINITY oxygenator
and related blood reservoirs. The investment in equipment for 1997 included
$1,494,000 related to the AFFINITY blood pump. This pump equipment is placed
with customers in exchange for a long-term commitment to purchase disposable
products from AVECOR. During 1997, the expenditures for furniture, fixtures and
equipment additions related to AVECOR's new U.S. manufacturing, research and
development and administrative facility were approximately $760,000.
 
    Leases for AVECOR's U.S. manufacturing, research and development, and
administrative facilities expired on December 31, 1996. In January 1997, AVECOR
consolidated its four separate facilities into a newly constructed facility,
which AVECOR has purchased. The cost of this facility was approximately
$8,600,000, plus approximately $1,050,000 for the purchase of furniture,
fixtures and manufacturing equipment for the facility. To finance the $9,650,000
total cost of the project, AVECOR entered into a $5,167,000 bank note payable
agreement in January 1997 and, in addition, paid $4,483,000 out of corporate
funds. Closing occurred on January 30, 1997.
 
    The note payable agreement bears interest at 8.11% and requires monthly
principal payments of $21,531, plus interest, through January 2002 with the
remaining principal and interest due February 2002. The note payable is
collateralized by the new corporate headquarters and manufacturing facility and,
among other things, requires AVECOR to maintain certain ratios related to
leverage, debt service and cash flow. As of June 30, 1998 AVECOR was in
compliance with the ratios required by the note payable. Additionally, the bank
note payable agreement prohibits AVECOR from distributing dividends to its
shareholders.
 
    At June 30, 1998, AVECOR had no restricted cash or investments. Of the
$4,450,000 which was restricted at December 31, 1996 for purchase of the new
facility, $1,000,000 was used in payment of the facility and $3,450,000 became
unrestricted, was reinvested and is being used for general corporate purposes,
research and development and working capital.
 
    Without considering the impact of the Merger, AVECOR's capital expenditures
for 1998 are expected to be approximately $4,000,000. This estimate includes
additional equipment, molds and tooling for the new oxygen saturation/hematocrit
device, AFFINITY blood pump, MYOTHERM XP, and for furthering production and
related efficiencies of the AFFINITY oxygenator line.
 
    The foregoing forward-looking statements relating to the amount of capital
expenditures and ultimate cash usage are dependent on the progress of AVECOR's
product development efforts, the outcome of
 
                                       72
<PAGE>
certain patent matters, the timing of the receipt of FDA marketing clearances
for any future products and the investment made in opportunities to further
existing products' production related to production efficiencies and quality,
and reduced cost.
 
FOREIGN CURRENCY TRANSACTIONS
 
    Transactions by AVECOR's international subsidiaries are negotiated, invoiced
and paid in various foreign currencies, primarily pounds sterling, and U.S.
dollars. Accordingly, AVECOR is currently subject to risks associated with
fluctuations in exchange rates between the various currencies.
 
    Substantially all of AVECOR's other international transactions are
denominated in U.S. dollars. Fluctuations in currency exchange rates in other
countries may therefore reduce the demand for AVECOR's products by increasing
the price of AVECOR's products in the currency of the countries in which the
products are sold.
 
YEAR 2000 ISSUES
 
    Computer programs have historically been written to abbreviate dates by
using two digits instead of four digits to identify a particular year. The
so-called "Year 2000" problem or "millennium bug" is the inability of computer
software or hardware to recognize or properly process dates ending in or after
"00." As the year 2000 approaches, significant attention is being focused on
updating or replacing such software and hardware in order to avoid system
failures, miscalculations or business interruptions that might otherwise result.
 
    AVECOR has reviewed its internal information systems and believes that the
costs and effort to address the Year 2000 problem will not be material to its
business, financial condition or results of operations, and, to the extent
necessary, may be resolved through replacement and upgrades to the software it
licenses from third parties. AVECOR has also reviewed its ONCOURSE software
product, the software embedded in its AFFINITY blood pump console and the
software for its saturation/hematocrit monitor under development and believes
them to be Year 2000 compliant. However, the Year 2000 problem may also
adversely impact AVECOR by affecting the business and operations of parties with
which AVECOR transacts business. AVECOR expects to initiate formal communication
with such parties regarding the Year 2000 problem later in 1998. There can be no
assurance that AVECOR will be able to effectively address Year 2000 issues
internally in a cost-efficient manner and without interruption to its business,
or that Year 2000 difficulties encountered by its suppliers, customers or other
parties will not have a material impact on AVECOR's business, financial
condition and results of operations.
 
NEW ACCOUNTING PRONOUNCEMENTS
 
    In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131, "Disclosures About Segments of an
Enterprise and Related Information," a new standard of reporting information
about operating or business segments in financial statements. The new standard
will be effective for AVECOR's annual financial statements in 1998. Although
AVECOR has not specifically evaluated what impact, if any, this new standard
will have on AVECOR's current reporting of operating and business segments,
AVECOR believes it will continue reporting as one operating and business
segment.
 
                                       73
<PAGE>
QUARTERLY OPERATING DATA
 
    The following table sets forth certain unaudited operating data of AVECOR
for the first two quarters in 1998 and each of the four quarters in 1997 and
1996. In the opinion of AVECOR's management, the data include all adjustments,
consisting of only normal recurring adjustments, necessary to present fairly the
information set forth therein.
 
<TABLE>
<CAPTION>
                                                                          FIRST     SECOND      THIRD     FOURTH
                                                                         QUARTER    QUARTER    QUARTER    QUARTER
                                                                        ---------  ---------  ---------  ---------
<S>                                                                     <C>        <C>        <C>        <C>
                                                                                       (UNAUDITED)
                                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
1998
Net sales.............................................................  $  12,456  $  13,565         --         --
Gross profit..........................................................      4,982      5,602         --         --
Net income............................................................        220        410         --         --
Diluted earnings per share............................................  $     .03  $     .05         --         --
1997
Net sales.............................................................  $  12,043  $  11,961  $  11,273  $  11,587
Gross profit..........................................................      4,983      5,061      4,785      4,461
Net income............................................................        387        403        365        172
Diluted earnings per share............................................  $     .05  $     .05  $     .05  $     .02
1996
Net sales.............................................................  $  10,293  $  11,145  $  11,315  $  11,648
Gross profit..........................................................      4,342      4,702      4,534      4,837
Net income (loss).....................................................        211     (1,876)       628        470
Diluted earnings (loss) per share.....................................  $     .03  $    (.24) $     .08  $     .06
</TABLE>
 
    The summation of quarterly diluted earnings (loss) per share may not equate
to the calculation for the year, as quarterly calculations are prepared on a
discrete basis. All earnings per share calculations are presented per the
definition of "diluted earnings per share" from FASB Statement No. 128.
 
                     CERTAIN TRANSACTIONS AND RELATIONSHIPS
                          BETWEEN AVECOR AND MEDTRONIC
 
    STOCK OPTION AGREEMENT.  AVECOR and Medtronic are parties to a Stock Option
Agreement dated July 12, 1998, pursuant to which AVECOR has granted to Medtronic
an option, exercisable under certain specified circumstances, to purchase 19.9%
of the AVECOR Common Stock. See "The Merger--Stock Option Agreement."
 
                                 LEGAL MATTERS
 
    The validity of the Medtronic Common Stock to be issued in connection with
the Merger will be passed upon for Medtronic by Fredrikson & Byron, P.A.,
Minneapolis, Minnesota. Members of such firm own, in the aggregate,
approximately 86,400 shares of Medtronic Common Stock.
 
    Certain legal matters for AVECOR, including the federal income tax
consequences in connection with the Merger, were passed upon by Oppenheimer
Wolff & Donnelly LLP, Minneapolis, Minnesota. Members of such firm own, in the
aggregate, approximately 46,235 shares of Medtronic Common Stock.
 
                                    EXPERTS
 
    The consolidated financial statements incorporated in this Proxy
Statement/Prospectus by reference to the Annual Report on Form 10-K of
Medtronic, Inc. for the year ended April 30, 1998 have been so incorporated in
reliance on the report of PricewaterhouseCoopers LLP, independent accountants,
given on the authority of said firm as experts in auditing and accounting.
 
                                       74
<PAGE>
    The consolidated balance sheets as of December 31, 1997 and 1996 and the
consolidated statements of operations, changes in shareholders' equity and cash
flows for each of the three years in the period ended December 31, 1997 of
AVECOR Cardiovascular Inc. included or incorporated by reference herein have
been included or incorporated by reference herein in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
that firm as experts in auditing and accounting.
 
                                       75
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
AVECOR CARDIOVASCULAR INC.
 
AUDITED FINANCIAL STATEMENTS AND RELATED NOTES
 
  Report of Independent Accountants........................................................................        F-2
 
  Consolidated Balance Sheets as of December 31, 1997 and 1996.............................................        F-3
 
  Consolidated Statements of Operations for the years ended December 31, 1997, 1996 and 1995...............        F-4
 
  Consolidated Statements of Changes in Shareholders' Equity for the years ended December 31, 1997, 1996
    and 1995...............................................................................................        F-5
 
  Consolidated Statements of Cash Flows for the years ended December 31, 1997, 1996 and 1995...............        F-6
 
  Notes to Consolidated Financial Statements...............................................................        F-7
 
UNAUDITED FINANCIAL STATEMENTS AND RELATED NOTES
 
  Consolidated Balance Sheet as of June 30, 1998...........................................................       F-21
 
  Consolidated Statements of Operations for the three months ended June 30, 1998 and 1997, and the six
    months ended June 30, 1998 and 1997....................................................................       F-22
 
  Consolidated Statements of Cash Flow for the six months ended June 30, 1998 and 1997.....................       F-23
 
  Notes to Consolidated Financial Statements...............................................................       F-24
</TABLE>
 
                                      F-1
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Shareholders and Board of Directors of
AVECOR Cardiovascular Inc.:
 
    We have audited the accompanying consolidated balance sheets of AVECOR
Cardiovascular Inc. as of December 31, 1997 and 1996, and the related
consolidated statements of operations, changes in shareholders' equity and cash
flows for each of the three years in the period ended December 31, 1997. 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 financial statements referred to above present fairly,
in all material respects, the consolidated financial position of AVECOR
Cardiovascular Inc. as of December 31, 1997 and 1996, and the consolidated
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1997, in conformity with generally accepted
accounting principles.
 
/s/ Coopers & Lybrand L.L.P.
 
Minneapolis, Minnesota
March 16, 1998
 
                                      F-2
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                          CONSOLIDATED BALANCE SHEETS
 
               (IN THOUSANDS EXCEPT SHARE AND PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                               AS OF DECEMBER 31,
                                                                                              --------------------
<S>                                                                                           <C>        <C>
                                                                                                1997       1996
                                                                                              ---------  ---------
                                                      ASSETS
Current assets:
  Cash and cash equivalents.................................................................  $   1,215  $   6,114
  Short-term investments....................................................................      3,727      2,638
  Accounts receivable, net..................................................................      8,277      7,298
  Inventories...............................................................................     10,634      9,476
  Deferred taxes............................................................................      1,315      1,274
  Other current assets......................................................................        330        744
                                                                                              ---------  ---------
    Total current assets....................................................................     25,498     27,544
Restricted cash and investments.............................................................         --      4,450
Property, plant and equipment, net..........................................................     16,689      4,808
Other assets................................................................................        572        359
                                                                                              ---------  ---------
    Total assets............................................................................  $  42,759  $  37,161
                                                                                              ---------  ---------
                                                                                              ---------  ---------
 
                                       LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................................................  $   1,978  $   2,790
  Accrued expenses..........................................................................      3,058      3,091
  Current maturities of long-term debt......................................................        258         --
  Accrued litigation settlement.............................................................         --      1,100
                                                                                              ---------  ---------
    Total current liabilities...............................................................      5,294      6,981
Deferred grant..............................................................................        153        205
Deferred taxes..............................................................................         --         37
Long-term debt..............................................................................      4,694         --
 
Commitments and contingencies (Notes 5 and 9)
 
Shareholders' equity:
  Serial preferred stock, par value $.01 per share; authorized 2,000,000 shares; none issued
  Common stock, par value $.01 per share; authorized 20,000,000 shares; issued and
    outstanding shares 8,021,000 and 7,812,000 shares at December 31, 1997 and 1996,
    respectively............................................................................         80         78
  Additional paid-in capital................................................................     30,482     29,024
  Retained earnings.........................................................................      1,936        609
  Cumulative translation adjustments........................................................        120        227
                                                                                              ---------  ---------
    Total shareholders' equity..............................................................     32,618     29,938
                                                                                              ---------  ---------
                                                                                              ---------  ---------
    Total liabilities and shareholders' equity..............................................  $  42,759  $  37,161
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-3
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                    FOR THE YEARS ENDED DECEMBER
                                                                                                 31,
                                                                                   -------------------------------
<S>                                                                                <C>        <C>        <C>
                                                                                     1997       1996       1995
                                                                                   ---------  ---------  ---------
Net sales........................................................................  $  46,864  $  44,401  $  33,340
Cost of sales....................................................................     27,574     25,986     18,180
                                                                                   ---------  ---------  ---------
    Gross profit.................................................................     19,290     18,415     15,160
Operating expenses:
  Selling, general and administrative............................................     13,428     11,885      8,727
  Litigation expense.............................................................         --      4,205        170
  Research and development.......................................................      3,902      3,651      2,773
                                                                                   ---------  ---------  ---------
    Operating income (loss)......................................................      1,960     (1,326)     3,490
  Interest income................................................................        495        725        586
  Interest expense...............................................................        383         --         --
                                                                                   ---------  ---------  ---------
Income (loss) before income taxes................................................      2,072       (601)     4,076
Income tax provision (benefit)...................................................        745        (34)       780
                                                                                   ---------  ---------  ---------
    Net income (loss)............................................................  $   1,327  $    (567) $   3,296
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
Earnings per share:
  Basic..........................................................................  $    0.17  $   (0.07) $    0.47
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
  Diluted........................................................................  $    0.17  $   (0.07) $    0.45
                                                                                   ---------  ---------  ---------
                                                                                   ---------  ---------  ---------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-4
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
           CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
 
                                 (IN THOUSANDS)
 
              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
<TABLE>
<CAPTION>
                                                             COMMON STOCK       ADDITIONAL               CUMULATIVE
                                                        ----------------------    PAID-IN    RETAINED    TRANSLATION
                                                         SHARES     PAR VALUE     CAPITAL    EARNINGS    ADJUSTMENTS     TOTAL
                                                        ---------  -----------  -----------  ---------  -------------  ---------
<S>                                                     <C>        <C>          <C>          <C>        <C>            <C>
Balances at December 31, 1994.........................      6,414   $      64    $  15,205   $  (2,120)   $      (4)   $  13,145
Sale of shares pursuant to public stock offering, net
  of expenses of $1,283...............................      1,161          12       12,641          --           --       12,653
Sale of shares for cash pursuant to Employee Stock
  Purchase Plan.......................................         18          --          178          --           --          178
Exercise of stock options.............................         71           1         (155)         --           --         (154)
Tax benefit realized upon exercise of stock options...         --          --          255          --           --          255
Net income for 1995...................................         --          --           --       3,296           --        3,296
Cumulative translation adjustments....................         --          --           --          --          (51)         (51)
                                                        ---------       -----   -----------  ---------       ------    ---------
Balances at December 31, 1995.........................      7,664          77       28,124       1,176          (55)      29,322
Exercise of stock warrants, net of expenses of $35....         85           1          528          --           --          529
Sale of shares for cash pursuant to Employee Stock
  Purchase Plan.......................................         23          --          250          --           --          250
Exercise of stock options.............................         40          --          (70)         --           --          (70)
Tax benefit realized upon exercise of stock options...         --          --          192          --           --          192
Net loss for 1996.....................................         --          --           --        (567)          --         (567)
Cumulative translation adjustments....................         --          --           --          --          282          282
                                                        ---------       -----   -----------  ---------       ------    ---------
Balances at December 31, 1996.........................      7,812          78       29,024         609          227       29,938
Exercise of stock warrants............................          5          --           28          --           --           28
Sale of shares for cash pursuant to Employee Stock
  Purchase Plan.......................................         34          --          283          --           --          283
Exercise of stock options.............................        168           2          975          --           --          977
Shares issued pursuant to Medical Advisory Board
  agreement...........................................          2          --           29          --           --           29
Tax benefit realized upon exercise of stock options...         --          --          143          --           --          143
Net income for 1997...................................         --          --           --       1,327           --        1,327
Cumulative translation adjustments....................         --          --           --          --         (107)        (107)
                                                        ---------       -----   -----------  ---------       ------    ---------
Balances at December 31, 1997.........................      8,021   $      80    $  30,482   $   1,936    $     120    $  32,618
                                                        ---------       -----   -----------  ---------       ------    ---------
                                                        ---------       -----   -----------  ---------       ------    ---------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-5
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                      FOR YEARS ENDED DECEMBER 31,
                                                                                     -------------------------------
<S>                                                                                  <C>        <C>        <C>
                                                                                       1997       1996       1995
                                                                                     ---------  ---------  ---------
Cash flows from operating activities:
  Net income (loss)................................................................  $   1,327  $    (567) $   3,296
  Adjustments to reconcile net income (loss) to net cash (used in) provided by
    operating activities:
    Depreciation and amortization..................................................      1,748      1,375      1,063
    Accretion of discount on investments...........................................       (280)      (508)      (189)
    Provision for bad debts........................................................        214        104         42
    Deferred income taxes..........................................................        (78)      (867)      (370)
    Stock compensation.............................................................         29         --         --
    Deferred grant.................................................................        (52)       (67)       (19)
    Changes in operating assets and liabilities:
      Accounts receivable..........................................................     (1,292)      (958)    (2,088)
      Inventories..................................................................     (1,185)    (3,547)    (1,696)
      Other current assets.........................................................        401       (199)      (127)
      Accounts payable.............................................................       (762)       122        946
      Accrued expenses.............................................................        139      1,542        623
      Accrued litigation settlement................................................     (1,100)     1,100         --
                                                                                     ---------  ---------  ---------
        Net cash (used in) provided by operating activities........................       (891)    (2,470)     1,481
                                                                                     ---------  ---------  ---------
Cash flows from investing activities:
  Purchase of property, plant and equipment........................................    (12,628)    (2,629)    (1,146)
  Purchase of short-term investments...............................................     (6,891)    (6,183)    (7,666)
  Proceeds upon sale or maturity of short-term investments.........................      6,082     11,810      2,000
  Restricted cash and investments..................................................      3,450     (4,450)        --
  Increase in other assets.........................................................       (222)       (53)      (162)
                                                                                     ---------  ---------  ---------
        Net cash used in investing activities......................................    (10,209)    (1,505)    (6,974)
                                                                                     ---------  ---------  ---------
Cash flows from financing activities:
  Net proceeds from sales of common stock..........................................        283        250     12,831
  Net proceeds from options exercised..............................................        977        (70)      (154)
  Net proceeds from warrants exercised.............................................         28        529         --
  Borrowings on long-term debt.....................................................      5,167         --         --
  Principal payments on long-term debt.............................................       (215)        --         --
  Grant proceeds...................................................................         --        102         --
                                                                                     ---------  ---------  ---------
      Net cash provided by financing activities....................................      6,240        811     12,677
                                                                                     ---------  ---------  ---------
Effect of exchange rates on cash...................................................        (39)       100        (41)
                                                                                     ---------  ---------  ---------
Net (decrease) increase in cash and cash equivalents...............................     (4,899)    (3,064)     7,143
Cash and cash equivalents, beginning of year.......................................      6,114      9,178      2,035
                                                                                     ---------  ---------  ---------
Cash and cash equivalents, end of year.............................................  $   1,215  $   6,114  $   9,178
                                                                                     ---------  ---------  ---------
                                                                                     ---------  ---------  ---------
Supplemental disclosure:
  Significant non-cash investing and financing transactions:
    Use of restricted funds for purchase of the U.S. facility......................  $   1,000         --         --
    Accounts payable recorded for the purchase of property, plant and equipment....         --  $     387         --
Cash paid for income taxes.........................................................  $     235  $      57  $     654
Cash paid for interest.............................................................  $     348         --         --
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-6
<PAGE>
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. BUSINESS DESCRIPTION AND SIGNIFICANT ACCOUNTING POLICIES:
 
BUSINESS DESCRIPTION:
 
    AVECOR Cardiovascular Inc. (the "Company") was incorporated on December 13,
1990. The Company develops, manufactures and markets specialty medical devices
for heart/lung bypass surgery and long-term respiratory support.
 
PRINCIPLES OF CONSOLIDATION:
 
    The consolidated financial statements include the accounts of AVECOR
Cardiovascular Inc. and its wholly-owned subsidiaries, AVECOR Cardiovascular
Ltd. and AVECOR Foreign Sales Corporation, after elimination of all significant
intercompany transactions and accounts.
 
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS:
 
    For financial reporting purposes, the Company considers all highly liquid
investments purchased with an original maturity of three months or less to be
cash equivalents. The Company's cash and cash equivalent balances are
concentrated primarily with two investment managers, the majority of which is
invested in daily money market funds.
 
    Short-term investments consist of bank certificates of deposit, U.S.
government securities, agency paper, commercial paper and other corporate
obligations, and money market instruments and are classified as short-term in
the balance sheet based on their maturity date. All of the Company's short-term
investments mature in 1998 and are considered by management to be "available for
sale." At December 31, 1997 and 1996, the estimated fair value of the short-term
investments approximated their cost. Unrealized gains and losses were not
significant.
 
    At December 31, 1997, the Company had no restricted cash or investments. At
December 31, 1996, cash and short-term investments totaling $4,450,000 were
restricted as to their use.
 
CONCENTRATIONS OF CREDIT RISK:
 
    The Company's accounts receivable are primarily due from hospitals and
independent foreign distributors located mainly in the U.S. and Western Europe.
Although the Company does not require collateral from its customers,
concentrations of credit risk in the U.S. are somewhat mitigated by a large
number of geographically dispersed customers. The Company does not presently
anticipate credit risk associated with foreign trade receivables (see Note 6),
although collection could be impacted by the underlying economies of the
respective countries.
 
INVENTORIES:
 
    Inventories are stated at the lower of cost or market, with cost determined
on the first-in, first-out method.
 
PROPERTY, PLANT AND EQUIPMENT:
 
    Property, plant and equipment are carried at cost less accumulated
depreciation and amortization. Depreciation and amortization are generally
recorded using the straight-line method over estimated useful asset lives. The
Company's new U.S. facility carries asset lives of forty, fifteen and seven
years for the building and shell, improvements, and equipment and furniture,
respectively. The cost of molds, tooling and dies is capitalized and depreciated
generally over periods of three to five years using straight-line or
 
                                      F-7
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
1. BUSINESS DESCRIPTION AND SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
units of production methods. Other equipment and leasehold improvements are
generally carry estimated useful lives of five years or less (shorter of asset
life or lease term for leasehold improvements). See "REVENUE RECOGNITION" below
for the Company's policy with regards to its blood pump equipment placed with
customers.
 
    Maintenance, repairs and minor improvements are charged to expense as
incurred while major betterments and renewals are capitalized. When assets are
sold or retired, the cost and related accumulated depreciation and amortization
are removed from the accounts and the resulting gain or loss is included in
operations.
 
LONG-LIVED ASSETS:
 
    The recoverability of long-lived assets is assessed annually or whenever
adverse events or changes in circumstances or business climate indicate that the
expected cash flows previously anticipated warrant reassessment. When such
reassessments indicate the potential of impairment, all business factors are
considered and, if the carrying values of long-lived assets are not likely to be
recovered from future net operating cash flows, they will be written down for
financial reporting purposes.
 
REVENUE RECOGNITION:
 
    For all products, other than when the equipment portion of the AFFINITY
blood pump system is shipped to the customer but title remains with the Company,
the Company recognizes sales upon product shipment.
 
    During 1997, the Company began marketing the AFFINITY blood pump system.
This blood pump system has both equipment and disposable products which are
manufactured and marketed by the Company. Typically, when the equipment portion
of the system is shipped, title to the equipment remains with the Company.
Subsequently, the total cost of this equipment is realized through ongoing sales
of disposable products to the customer, and accordingly is amortized and
recorded as a charge to operations over the life of the equipment, generally
using an asset life of three to five years.
 
RESEARCH AND DEVELOPMENT:
 
    Research and development costs are expensed as incurred.
 
INCOME TAXES:
 
    The Company accounts for income taxes using the liability method. The
liability method provides that deferred tax assets and liabilities are recorded
based on the differences between the tax bases of assets and liabilities and
their carrying amounts for financial reporting purposes ("temporary
differences") using enacted tax rates in effect in the years in which the
differences are expected to reverse. Temporary differences relate primarily to
the allowance for doubtful accounts, obsolete inventory allowances,
depreciation, and accruals for vacation, product liability and warranty costs.
 
NET INCOME (LOSS) PER SHARE:
 
    In February 1997, the Financial Accounting Standards Board issued Statement
No. 128, a new standard for computing and presenting earnings per share. As
required, the Company adopted this new standard in the fourth quarter of 1997.
Net income (loss) per share for all periods presented have been computed by
dividing net income (loss) by the weighted average number of common shares
outstanding
 
                                      F-8
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
1. BUSINESS DESCRIPTION AND SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
("basic EPS") and by the weighted average number of common and common equivalent
shares outstanding ("diluted EPS"). Common equivalent shares relate to stock
options and stock warrants when their effect is not antidilutive.
 
    For all periods presented, the weighted average common and common equivalent
shares outstanding are as follows:
 
<TABLE>
<CAPTION>
                                                                              FOR THE YEARS ENDED DECEMBER 31,
                                                                             ----------------------------------
<S>                                                                          <C>         <C>         <C>
                                                                                1997        1996        1995
                                                                             ----------  ----------  ----------
Weighted average common shares outstanding.................................   7,921,000   7,767,000   7,046,000
Common equivalent shares outstanding:
Option equivalents.........................................................      68,000          --     262,000
Warrant equivalents........................................................       1,000          --      45,000
                                                                             ----------  ----------  ----------
Weighted average common and common equivalent shares outstanding...........   7,990,000   7,767,000   7,353,000
                                                                             ----------  ----------  ----------
                                                                             ----------  ----------  ----------
</TABLE>
 
FOREIGN CURRENCY TRANSLATION:
 
    All assets and liabilities of the Company's international subsidiaries are
translated to U.S. dollars at year-end exchange rates, while elements of the
statement of operations are translated at average exchange rates in effect
during the year. Translation adjustments arising from the use of differing
exchange rates are included in cumulative translation adjustments in
shareholders' equity.
 
USE OF ESTIMATES:
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates. The most
significant areas which require the use of management's estimates relate to the
determination of the allowances for doubtful accounts receivable and obsolete
inventories, the need for a valuation allowance on deferred tax assets and the
determination related to the probability of the patent contingency matter.
 
                                      F-9
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
2. BALANCE SHEET INFORMATION:
 
    The following provides additional information concerning selected balance
sheet accounts as of December 31, 1997 and 1996:
 
<TABLE>
<CAPTION>
                                                                                           1997           1996
                                                                                       -------------  ------------
<S>                                                                                    <C>            <C>
Accounts receivable, net:
  Accounts receivable................................................................  $   8,611,000  $  7,418,000
  Allowance for doubtful accounts....................................................       (334,000)     (120,000)
                                                                                       -------------  ------------
                                                                                       $   8,277,000  $  7,298,000
                                                                                       -------------  ------------
                                                                                       -------------  ------------
Inventories:
  Raw materials......................................................................  $   3,758,000  $  3,424,000
  Work-in-progress...................................................................      2,189,000     2,343,000
  Finished goods.....................................................................      4,687,000     3,709,000
                                                                                       -------------  ------------
                                                                                       $  10,634,000  $  9,476,000
                                                                                       -------------  ------------
                                                                                       -------------  ------------
Property, plant and equipment, net:
  Land...............................................................................  $   1,409,000  $         --
  Building...........................................................................      7,413,000       557,000
  Machinery and equipment............................................................      5,181,000     3,324,000
  Office and laboratory equipment....................................................      3,448,000     2,430,000
  Molds, tooling and dies............................................................      3,011,000     2,183,000
  Leasehold improvements.............................................................        829,000       786,000
  Equipment placed with customers....................................................      1,494,000            --
                                                                                       -------------  ------------
                                                                                          22,785,000     9,280,000
Accumulated depreciation and amortization............................................     (6,096,000)   (4,472,000)
                                                                                       -------------  ------------
                                                                                       $  16,689,000  $  4,808,000
                                                                                       -------------  ------------
                                                                                       -------------  ------------
Accrued expenses:
  Payroll............................................................................  $     150,000  $    472,000
  Vacation...........................................................................        319,000       288,000
  Commissions........................................................................        290,000       447,000
  Income taxes.......................................................................        709,000       616,000
  Real estate taxes..................................................................        355,000            --
  Other..............................................................................      1,235,000     1,268,000
                                                                                       -------------  ------------
                                                                                       $   3,058,000  $  3,091,000
                                                                                       -------------  ------------
                                                                                       -------------  ------------
</TABLE>
 
                                      F-10
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SHAREHOLDERS' EQUITY:
 
SERIAL PREFERRED STOCK:
 
    The Company's Second Restated Articles of Incorporation, as amended, provide
for 2,000,000 shares of preferred stock, par value $.01 per share, issuable in
series ("Serial Preferred Stock"). The Board of Directors is empowered to
authorize the issuance and establish the terms of any shares of the Serial
Preferred Stock without shareholder approval. In 1996, the Board of Directors
authorized 200,000 shares for issuance as Series A Junior Preferred Stock under
the Shareholder Rights Plan.
 
STOCK INCENTIVE PLAN:
 
    The Company's 1991 Stock Incentive Plan ("Plan") provides for granting to
eligible employees and certain other individuals nonqualified and incentive
options. The Company has reserved 1,050,000 shares of common stock for issuance
under the Plan. At December 31, 1997 there were 20,000 options available for
grant under the Plan. In December 1997, the Company's Board of Directors
authorized, subject to shareholder approval, an additional 450,000 shares of
common stock to be reserved for issuance under the Plan. Also, in December 1997,
the Company's Board of Directors authorized 50,000 stock option grants under the
Plan, subject to shareholder approval. Options granted under the Plan are
generally exercisable beginning one year from the date of grant in cumulative
yearly amounts of 25% of the shares under option and expire, if not exercised,
five to ten years after the date of grant.
 
    Pursuant to the terms of the Plan, optionees may use cash, tender previously
owned shares, or be credited for a portion of the shares exercised to reimburse
the Company for the cost of exercising the options and the taxes due on the
recognized gain. The shares tendered from the optionee or credited at time of
exercise are at the fair market value of the stock on the transaction date. No
common shares were credited to optionees to satisfy such obligations in 1997. In
1996, 19,000 common shares valued at $278,000 and, in 1995, 33,000 shares valued
at $486,000 were credited the optionees at the exercise date to satisfy such
obligations.
 
    Upon the occurrence of a change of control (as defined), all outstanding
options become immediately exercisable in full and all restrictions with respect
to outstanding restricted stock awards immediately lapse.
 
    The Plan also provides for stock bonuses and awards of restricted shares of
the Company's common stock to eligible recipients. Restricted shares awarded may
not be sold, assigned, or otherwise transferred by the recipient until the
shares awarded become free of restrictions on transferability. All shares still
subject to restrictions will be forfeited and returned to the Plan if
affiliation with the Company terminates. Plan administrators may waive or
accelerate the lapsing of restrictions.
 
    There were no stock bonuses and no restricted shares issued under the Plan
for the years ended December 31, 1997, 1996 and 1995.
 
                                      F-11
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SHAREHOLDERS' EQUITY: (CONTINUED)
    A summary of option transactions under the Plan for 1997, 1996 and 1995
follows:
 
<TABLE>
<CAPTION>
                                                                                   WEIGHTED
                                                                                    AVERAGE           OPTION
                                                                                   EXERCISE         PRICE RANGE
                                                                      SHARES    PRICE PER SHARE      PER SHARE
                                                                    ----------  ---------------  -----------------
<S>                                                                 <C>         <C>              <C>
Balances, December 31, 1994.......................................     570,000     $    6.65        $1.00-$9.94
  Options granted.................................................      42,000     $   10.63       $8.38-$12.63
  Options exercised...............................................    (104,000)    $    3.20        $1.00-$9.88
  Options cancelled...............................................      (3,000)    $    9.88           $9.88
                                                                    ----------
Balances, December 31, 1995.......................................     505,000     $    7.67       $1.00-$12.63
  Options granted.................................................     309,000     $   12.32       $10.88-$14.75
  Options exercised...............................................     (58,000)    $    3.58       $1.00-$12.00
  Options cancelled...............................................    (113,000)    $   11.99       $9.88-$12.00
                                                                    ----------
Balances, December 31, 1996.......................................     643,000     $    9.51       $2.00-$14.75
  Options granted.................................................     286,000     $    8.28       $7.00-$12.00
  Options exercised...............................................    (168,000)    $    5.81        $2.00-$9.94
  Options cancelled...............................................     (77,000)    $   11.16       $6.38-$14.00
                                                                    ----------
Balances, December 31, 1997.......................................     684,000     $    9.72       $5.13-$14.75
                                                                    ----------
                                                                    ----------
</TABLE>
 
    The following table summarizes information about stock options outstanding
and exercisable at December 31, 1997:
 
<TABLE>
<CAPTION>
                            OPTIONS OUTSTANDING             OPTIONS EXERCISABLE
                   -------------------------------------  ------------------------
<S>                <C>          <C>          <C>          <C>          <C>
                                 WEIGHTED-
                                   AVG.       WEIGHTED-                 WEIGHTED-
    RANGE OF                     REMAINING      AVG.                      AVG.
    EXERCISE         NUMBER     CONTRACTUAL   EXERCISE      NUMBER      EXERCISE
     PRICES        OUTSTANDING     LIFE         PRICE     EXERCISABLE     PRICE
- -----------------  -----------  -----------  -----------  -----------  -----------
   $5.13-$7.00         29,000    2.0 years    $    6.72       19,000    $    6.57
      $7.13           182,000    9.9 years    $    7.13           --           --
  $7.63-$10.00        222,000    3.1 years    $    9.74      114,000    $    9.70
  $10.13-$14.75       251,000    3.4 years    $   11.94       56,000    $   12.00
                   -----------                            -----------
                      684,000    5.0 years    $    9.72      189,000    $   10.08
                   -----------                            -----------
                   -----------                            -----------
</TABLE>
 
1995 NON-EMPLOYEE DIRECTOR PLAN:
 
    In 1995, the Company's Board of Directors authorized, and in 1996, the
Company's shareholders approved, a reserve of 250,000 shares of the Company's
common stock for issuance to Non-Employee Directors of the Company, pursuant to
the 1995 Non-Employee Director Plan (the "1995 Director Plan"). Options granted
under the 1995 Director Plan vest on a cumulative basis, with one third
exercisable as of the date of grant and the remainder becoming exercisable in
equal installments on each of the first and second anniversaries of the date of
grant. Each option expires and is no longer exercisable on the date ten years
from its date of grant. Options to purchase 42,000 shares at $13.38 and 10,500
shares at $12.25 per share were granted during 1995 and 1996, respectively. At
December 31, 1997, there were 197,500 options available for grant under the 1995
Director Plan.
 
                                      F-12
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SHAREHOLDERS' EQUITY: (CONTINUED)
    The following table summarizes information about stock options outstanding
and exercisable at December 31, 1997:
 
<TABLE>
<CAPTION>
                            OPTIONS OUTSTANDING             OPTIONS EXERCISABLE
                   -------------------------------------  ------------------------
<C>                <S>          <C>          <C>          <C>          <C>
                                 WEIGHTED-
                                   AVG.       WEIGHTED-                 WEIGHTED-
    RANGE OF                     REMAINING      AVG.                      AVG.
    EXERCISE         NUMBER     CONTRACTUAL   EXERCISE      NUMBER      EXERCISE
     PRICES        OUTSTANDING     LIFE         PRICE     EXERCISABLE     PRICE
- -----------------  -----------  -----------  -----------  -----------  -----------
  $12.25-$13.38        52,500    7.7 years    $   13.15       49,000    $   13.21
</TABLE>
 
ACCOUNTING FOR STOCK-BASED COMPENSATION:
 
    The Company adopted Financial Accounting Standards Board Issued Statement
No. 123, "Accounting for Stock-Based Compensation", in 1996. The Company has
continued to measure compensation cost for its stock-based compensation plans
using the intrinsic value-based method of accounting and, therefore, the new
standard has had no effect on the Company's operating results.
 
    Had the Company used the fair value-based method of accounting for its 1991
Stock Incentive Plan and 1995 Non-Employee Director Plan beginning with options
granted in 1995 and charged this compensation cost along with the value of the
shares granted through the Employee Stock Purchase Plan against income, over the
plans' vesting periods, based on the fair value of options at the date of grant,
net income (loss) and diluted earnings (loss) per share for 1997, 1996 and 1995
would have been as follows:
 
<TABLE>
<CAPTION>
                                                                               1997         1996          1995
                                                                           ------------  -----------  ------------
<S>                                                        <C>             <C>           <C>          <C>
Net income (loss)........................................  As reported     $  1,327,000  $  (567,000) $  3,296,000
                                                           Pro forma       $  1,011,000  $  (845,000) $  3,117,000
Diluted net earnings (loss) per share....................  As reported     $       0.17  $     (0.07) $       0.45
                                                           Pro forma       $       0.13  $     (0.11) $       0.42
</TABLE>
 
    The pro forma information above only includes stock options granted and
stock purchased under the Employee Stock Purchase Plan in 1995, 1996 and 1997.
 
    The fair value of each option grant was estimated on the date of grant using
the Black-Scholes option-pricing model for the 1991 Stock Incentive Plan and the
1995 Non-Employee Director Plan. The assumptions for 1997, 1996 and 1995 were as
follows:
 
<TABLE>
<CAPTION>
                                             1997                       1996                       1995
                                   -------------------------  -------------------------  -------------------------
<S>                                <C>             <C>        <C>             <C>        <C>             <C>
                                        1991         1995          1991         1995          1991         1995
                                     INCENTIVE     DIRECTOR     INCENTIVE     DIRECTOR     INCENTIVE     DIRECTOR
                                        PLAN         PLAN          PLAN         PLAN          PLAN         PLAN
                                   --------------  ---------  --------------  ---------  --------------  ---------
Risk-free interest rates.........    5.8%-6.6%       6.2%       5.2%-6.8%       6.2%       6.2%-7.8%       6.6%
Expected life....................   4.3-8 years     8 years     4.3 years      8 years     4.3 years      8 years
Expected volatility..............       50%           50%          50%           50%          50%           50%
Expected dividends...............        0%           0%            0%           0%            0%           0%
</TABLE>
 
WARRANTS:
 
    In connection with the completion of its initial public offering of common
shares in 1992, the Company granted to the representatives of the underwriters
warrants for 90,000 shares of common stock at
 
                                      F-13
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
3. SHAREHOLDERS' EQUITY: (CONTINUED)
an exercise price of $6.60 per share. During 1997 and 1996, the Company issued
5,000 and 85,000 shares of common stock, respectively, pursuant to the exercise
of these warrants. At December 31, 1997, there are no outstanding warrants.
 
EMPLOYEE STOCK PURCHASE PLAN:
 
    The AVECOR Cardiovascular Inc. Employee Stock Purchase Plan ("Stock Purchase
Plan"), which is available to substantially all employees, enables eligible
employees to contribute up to 10% of their wages toward quarterly purchases of
the Company's common stock at 85% of market value on the first or last day of
each calendar quarter, whichever had the lower stock price. The Company has
reserved 100,000 shares of common stock for issuance under the Stock Purchase
Plan. Employees purchased 34,000 shares at an average price of $7.72 per share
in 1997, 23,000 shares at an average price of $11.00 per share in 1996, and
18,000 shares at an average price of $10.17 per share in 1995. In 1997, the
Company's Board of Directors authorized, subject to shareholder approval, an
additional 125,000 shares of common stock to be reserved for issuance under the
Stock Purchase Plan as, at December 31, 1997, there were no shares of common
stock available for purchase under this plan.
 
SHAREHOLDER RIGHTS PLAN:
 
    In June 1996, the Company adopted a shareholder rights plan, pursuant to
which the Company declared a dividend distribution of one Preferred Share
Purchase Right on each share of the Company's Common Stock outstanding on August
2, 1996. Each Right entitles the holder to buy one-thousandth of a share of the
Company's Series A Junior Preferred Stock, or a combination of securities and
assets of equivalent value, at an exercise price of $80.00, subject to
adjustment. The description and terms of the Rights are set forth in a Rights
Agreement dated June 26, 1996, as amended, between the Company and Norwest Bank
Minnesota, N.A., as Rights Agent.
 
4. LONG-TERM DEBT:
 
    In January 1997, the Company purchased a new corporate headquarters and
manufacturing facility for $9,650,000 and consolidated its former four separate
U.S. facilities. In connection with this purchase, the Company entered into a
$5,167,000 bank note payable agreement in January 1997 and, in addition,
utilizing restricted cash and investments, funded the remaining cost of the new
building.
 
    The bank note payable agreement bears interest at 8.11% and requires monthly
principal payments of $21,531, plus interest, through January 2002 with the
remaining principal and interest due February 2002. The bank note payable is
collateralized by the new corporate headquarters and manufacturing facility and,
among other things, requires the Company to meet certain ratios related to
leverage, debt service and cash flow. Additionally, the bank note payable
agreement prohibits the Company from distributing dividends to its shareholders.
The Company believes the fair value of this debt approximates its carrying value
at December 31, 1997.
 
                                      F-14
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
4. LONG-TERM DEBT: (CONTINUED)
 
    At December 31, 1997, remaining principal payments on the bank note payable
are as follows:
 
<TABLE>
<CAPTION>
YEAR ENDING DECEMBER 31
- ------------------------------------------------------------------------------------
<S>                                                                                   <C>
1998................................................................................  $    258,000
1999................................................................................       258,000
2000................................................................................       258,000
2001................................................................................       258,000
2002................................................................................     3,920,000
                                                                                      ------------
                                                                                      $  4,952,000
                                                                                      ------------
                                                                                      ------------
</TABLE>
 
5. COMMITMENTS:
 
LEASES:
 
    In 1996 and years prior, the Company leased all of its facilities and
certain equipment pursuant to operating leases. The leases for the Company's
United States operating facilities expired in December 1996, at which time the
Company occupied its new corporate headquarters. The Company's facility near
Glasgow, Scotland is leased for a period of ten years ending in October 2003.
This lease agreement provides for adjustment of minimum rentals based upon
market rates in 1998 and requires minimum monthly rental payments plus real
estate taxes and applicable common facility operating expenses.
 
    Rent expense, including allocated real estate taxes and operating expenses,
under all rental agreements was $325,000, $725,000 and $596,000 for the years
ended December 31, 1997, 1996 and 1995, respectively.
 
    The following is a schedule of future minimum lease payments pursuant to the
terms of the non-cancellable leases for the Glasgow, Scotland facility described
above:
 
<TABLE>
<CAPTION>
YEAR ENDING DECEMBER 31
- --------------------------------------------------------------------------------------
<S>                                                                                     <C>
1998..................................................................................  $  147,000
1999..................................................................................     147,000
2000..................................................................................     147,000
2001..................................................................................     147,000
2002..................................................................................     147,000
2003 and thereafter...................................................................     112,000
                                                                                        ----------
                                                                                        $  847,000
                                                                                        ----------
                                                                                        ----------
</TABLE>
 
ROYALTY AGREEMENTS:
 
    SILICONE PRODUCTS--
 
    In connection with the Company's June 1991 acquisition of the Surgical
Division of SCIMED Life Systems, Inc. (the Predecessor Business), the Company
entered into a royalty agreement with SCIMED. The agreement required the Company
to make payments to SCIMED primarily based on net sales (as defined), through
June 1996, of products previously manufactured by the Predecessor Business as of
the acquisition date. The Company incurred royalties of $95,000 and $178,000 for
the years ended December 31, 1996 and 1995, respectively, under this agreement.
 
                                      F-15
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
5. COMMITMENTS: (CONTINUED)
    The agreement also provides for royalty payments should the Company develop
and sell new products (new generation products) using certain technology
embodied in product models developed by the Predecessor Business. This element
of the agreement expires in June 2001. The Company has not paid or incurred any
such royalties through December 31, 1997.
 
    AFFINITY BLOOD PUMP--
 
    The Company also entered into a royalty agreement in connection with the
Company's acquisition of an exclusive license to market the AFFINITY blood pump.
This agreement requires the Company to make payments based on net sales of the
pump chamber (the disposable portion of the AFFINITY blood pump system) and net
profits of the pump console (the equipment portion of the AFFINITY blood pump
system) through August 2002. The term of the agreement may be extended by the
Company until the expiration of the last-to-expire of the patents covered by
this agreement or the useful life of the know-how (as defined) licensed,
whichever is longer. Under the terms of the royalty agreement, the Company must
pay minimum royalties each year. The Company's royalties incurred of $55,000 for
the year ended December 31, 1997 exceeded the minimum royalty related to the
first year of the royalty agreement.
 
    BIO-PASSIVE SURFACE--
 
    The Company also has use of an exclusive license allowing it to apply a
bio-passive surface to its products. The agreement requires the Company to make
quarterly payments based on a percentage of net sales of products utilizing the
bio-passive surface. The Company can retain exclusivity of the license if it
pays minimum annual royalties. The Company incurred royalties of $35,000 for the
year ended December 31, 1997 under this agreement.
 
PRODUCT LIABILITY:
 
    The Company is self-insured on product liability claims below a certain
dollar limitation and maintains product liability insurance above this
limitation per claim and in the aggregate.
 
CONFIDENTIALITY AND NONCOMPETE AGREEMENTS:
 
    The Company has entered into confidentiality and non-compete agreements with
certain employees. If any of these employees are terminated, the Company is
conditionally required to pay the employee 75% of his or her base salary, as
defined, during the non-compete period (one to two years) if the employee
remains unemployed during this period.
 
6. INDUSTRY SEGMENT INFORMATION:
 
    Since its inception, the Company has operated in the single industry segment
of developing, manufacturing and marketing medical devices.
 
    The Company distributes its products through its direct sales force and
independent sales representatives in the United States, Canada, the United
Kingdom and France. Additionally, the Company distributes its products through
foreign independent distributors, primarily in Europe and Asia, who then market
the products directly to medical institutions. During 1997, the Company
terminated agreements with its last remaining domestic distributor and its only
Canadian distributor. A direct sales force now serves the markets formerly
assigned to these distributors. Management does not believe the Company is
primarily
 
                                      F-16
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6. INDUSTRY SEGMENT INFORMATION: (CONTINUED)
dependent upon any one distributor for the ultimate sale of products to medical
institutions. Sales to distributors accounting for 10% or more of the Company's
net sales were as follows:
 
<TABLE>
<CAPTION>
                                                                       1997         1996          1995
                                                                       -----        -----     ------------
<S>                                                                 <C>          <C>          <C>
Distributor #1....................................................          (1)          (1)  $  3,503,000
</TABLE>
 
- ------------------------
 
(1) Accounted for less than 10% of the Company's net sales.
 
    Total export sales from the U.S. to unaffiliated entities (primarily to
Europe and payable in U.S. dollars) were $4,952,000, $4,912,000 and $3,480,000,
respectively, for the years ended December 31, 1997, 1996 and 1995.
 
    At December 31, 1997 and 1996, consolidated accounts receivable include
$4,366,000 and $3,738,000, respectively, due from customers located outside of
the U.S.
 
<TABLE>
<CAPTION>
                                                                         AVECOR          AVECOR
                                                                     CARDIOVASCULAR  CARDIOVASCULAR
YEAR ENDED DECEMBER 31                                                    INC.            LTD.       CONSOLIDATED
- -------------------------------------------------------------------  --------------  --------------  -------------
<S>                                                                  <C>             <C>             <C>
1997
Sales to unaffiliated customers....................................   $ 32,634,000    $ 14,230,000   $  46,864,000
Operating income...................................................      1,640,000         320,000       1,960,000
Identifiable assets................................................     36,705,000       6,054,000      42,759,000
1996
Sales to unaffiliated customers....................................     31,290,000      13,111,000      44,401,000
Operating income (loss)............................................     (1,738,000)        412,000      (1,326,000)
Identifiable assets................................................     30,699,000       6,462,000      37,161,000
1995
Sales to unaffiliated customers....................................     22,638,000      10,702,000      33,340,000
Operating income...................................................      2,806,000         684,000       3,490,000
Identifiable assets................................................     27,902,000       5,617,000      33,519,000
</TABLE>
 
    During the years ended December 31, 1997, 1996, and 1995, AVECOR
Cardiovascular Ltd. made capital expenditures of approximately $393,000,
$146,000 and $57,000, respectively.
 
    In June 1997, the Financial Accounting Standards Board issued Statement 131,
"Disclosures About Segments of an Enterprise and Related Information," a new
standard of reporting information about operating or business segments in
financial statements. The new standard will be effective for the Company's
annual financial statements in 1998. Although the Company has not evaluated what
impact, if any, this new standard will have on the Company's current reporting
of operating and business segments, the Company believes it will continue
reporting as one operating and business segment.
 
7. RETIREMENT SAVINGS PLAN:
 
    The AVECOR Cardiovascular Inc. Retirement Savings Plan (the "Savings Plan")
is a profit sharing plan which provides for voluntary pre-tax employee
contributions and discretionary employer matching and profit sharing
contributions and is intended to satisfy the requirements of Section 401(k) of
the Internal Revenue Code. Generally, all employees of the Company who are over
21 years of age and who have completed one year of service with the Company are
eligible to participate in the Savings Plan. The
 
                                      F-17
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
7. RETIREMENT SAVINGS PLAN: (CONTINUED)
Company did not make any contributions to the Savings Plan in 1997, and made
contributions of $23,000 and $10,000 to the Savings Plan related to 1996 and
1995, respectively.
 
8. INCOME TAXES:
 
    The components of the Company's income tax provision (benefit) are as
follows:
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31
                                                           ----------------------------------
<S>                                                        <C>         <C>         <C>
                                                              1997        1996        1995
                                                           ----------  ----------  ----------
Current
  U.S. federal...........................................  $  585,000  $  484,000  $  875,000
  U.S. state.............................................      15,000      57,000       5,000
  International..........................................     223,000     292,000     270,000
Deferred.................................................     (78,000)   (867,000)   (370,000)
                                                           ----------  ----------  ----------
                                                           $  745,000  $  (34,000) $  780,000
                                                           ----------  ----------  ----------
                                                           ----------  ----------  ----------
</TABLE>
 
    The variance of the 1997 and 1996 effective tax rate from the U.S. statutory
tax rate was primarily due to losses incurred by the Company's French subsidiary
for which no tax benefit has been recorded because of the uncertainty of their
realization, offset by the generation of research and experimentation credits.
The variance of the 1995 effective tax rate from the U.S. statutory tax rate was
primarily due to utilization of $1,730,000 of net operating loss carryforwards
("NOLs") and $26,000 of state research and experimentation credits.
 
    Components of the Company's deferred tax assets and liabilities are as
follows:
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31
                                                                    --------------------------
<S>                                                                 <C>           <C>
                                                                        1997          1996
                                                                    ------------  ------------
Deferred tax assets:
  Patent settlement...............................................  $         --  $    418,000
  Research and experimentation credits............................       881,000       560,000
  French subsidiary NOL carryforwards.............................       226,000       119,000
  AMT carryforwards...............................................       195,000            --
  Other, primarily certain accrued expenses.......................       239,000       296,000
  Valuation allowance.............................................      (226,000)     (119,000)
                                                                    ------------  ------------
                                                                       1,315,000     1,274,000
Deferred tax liabilities:
  Depreciation....................................................            --       (37,000)
                                                                    ------------  ------------
Net deferred tax assets...........................................  $  1,315,000  $  1,237,000
                                                                    ------------  ------------
                                                                    ------------  ------------
</TABLE>
 
    The Company has established a valuation allowance to offset its deferred tax
asset related to its French subsidiary's NOL carryforwards due to the
uncertainty of their realization. The NOL carryforwards expire from 2000 to
2002. The Company expects its future taxable income will be sufficient to
realize its other deferred tax assets; therefore, there is no valuation
allowance offsetting them.
 
                                      F-18
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
8. INCOME TAXES: (CONTINUED)
    Available research and experimentation credits at December 31, 1997,
represent federal and state amounts of approximately $632,000 and $249,000,
respectively, with expiration dates ranging from 2007 to 2012. The Company's AMT
credit carryforwards do not expire.
 
    Domestic and international components of income (loss) before income taxes
are as follows:
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31
                                                     -----------------------------------------
                                                         1997          1996           1995
                                                     ------------  -------------  ------------
<S>                                                  <C>           <C>            <C>
AVECOR Cardiovascular Inc..........................  $  1,663,000  $  (1,088,000) $  3,351,000
AVECOR Cardiovascular Ltd..........................       409,000        487,000       725,000
                                                     ------------  -------------  ------------
                                                     $  2,072,000  $    (601,000) $  4,076,000
                                                     ------------  -------------  ------------
                                                     ------------  -------------  ------------
</TABLE>
 
    Undistributed earnings of the Company's foreign subsidiary are indefinitely
reinvested in foreign operations. Accordingly, no provision has been made for
income taxes that might be payable upon remittance.
 
9. PATENT MATTERS:
 
    In March 1997, the Company filed suit in U.S. District Court for the
District of Minnesota, seeking to invalidate a newly issued U.S. patent held by
a competing manufacturer of blood oxygenators and other medical devices, and
requesting a determination that the Company's AFFINITY oxygenator does not
infringe the competitor's patent. The Company filed suit in response to a
December 1996 letter from the competitor, alleging that the AFFINITY oxygenator
infringes certain claims under the competitor's patent, and requesting
discussion regarding a possible license agreement. The Company reviewed the
subject patent and concluded, based on an opinion from its patent counsel, that
none of the claims in the patent are infringed by the AFFINITY oxygenator, and
that the patent is, in any event, invalid. On October 6, 1997, the Magistrate
Judge of the United States District Court vacated a previous order and granted a
stay in the proceedings, including the suspension of discovery, pending the
outcome of the competitor's request for re-issuance of the aforementioned
patent. The expense and effort potentially required to bring this action, as
well as the outcome of any counterclaim successfully brought against the Company
by the competitor, could have a material adverse effect on the Company's
business, financial condition and results of operations.
 
    In 1996, the Company reached an agreement with COBE Laboratories Inc. (COBE)
to settle COBE's patent suit against the Company. The terms of the settlement
with COBE provided for the Company to make net payments totaling $2,200,000. Two
net payments of $1,100,000 were made in August 1996 and August 1997,
respectively. The net settlement costs of $2,200,000 and the associated legal
costs were recognized as a charge to operations in 1996.
 
                                      F-19
<PAGE>
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
10. QUARTERLY DATA (UNAUDITED):
 
    The following table sets forth certain unaudited operating data for the four
quarters in 1997 and 1996. In the opinion of management, the data include all
adjustments, consisting of only normal recurring adjustments, necessary to
present fairly the information set forth therein.
 
<TABLE>
<CAPTION>
                                                                          FIRST     SECOND      THIRD     FOURTH
                                                                         QUARTER    QUARTER    QUARTER    QUARTER
                                                                        ---------  ---------  ---------  ---------
<S>                                                                     <C>        <C>        <C>        <C>
                                                                                       (UNAUDITED)
                                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
1997
Net sales.............................................................  $  12,043  $  11,961  $  11,273  $  11,587
Gross profit..........................................................      4,983      5,061      4,785      4,461
Net income............................................................        387        403        365        172
Diluted income per share..............................................  $     .05  $     .05  $     .05  $     .02
 
1996
Net sales.............................................................  $  10,293  $  11,145  $  11,315  $  11,648
Gross profit..........................................................      4,342      4,702      4,534      4,837
Net income (loss).....................................................        211     (1,876)       628        470
Diluted income (loss) per share.......................................  $     .03  $    (.24) $     .08  $     .06
</TABLE>
 
    The summation of quarterly diluted earnings (loss) per share may not equate
to the calculation for the year as quarterly calculations are prepared on a
discrete basis. All earnings per share calculations are presented per the
definition of "diluted earnings per share" from FASB Statement No. 128.
 
11. NEW ACCOUNTING STANDARD:
 
    In June 1997, the Financial Accounting Standards Board issued Statement 130,
"Reporting Comprehensive Income," a new standard requiring the reporting and
display of "comprehensive income" (defined as the change in equity of a business
enterprise during a period from sources other than those resulting from
investments by owners and distributors to owners) and its components in a full
set of general purpose financial statements. The new standard will be effective
for the Company's annual financial statements in 1998. The Company's cumulative
translation adjustment is considered a component of "comprehensive income,"
however the Company has not evaluated what other components of its changes in
equity would be components of "comprehensive income."
 
                                      F-20
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                           CONSOLIDATED BALANCE SHEET
 
                                  (UNAUDITED)
 
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                         JUNE 30,
                                                                                                           1998
                                                                                                         ---------
<S>                                                                                                      <C>
                                                      ASSETS
 
Current assets:
  Cash and cash equivalents............................................................................  $   3,837
  Short-term investments...............................................................................      1,966
  Accounts receivable, net.............................................................................      9,443
  Inventories..........................................................................................     10,837
  Deferred taxes.......................................................................................      1,315
  Other current assets.................................................................................        412
                                                                                                         ---------
    Total current assets...............................................................................     27,810
 
Property, plant and equipment, net.....................................................................     17,658
Other assets...........................................................................................        581
                                                                                                         ---------
    Total assets.......................................................................................  $  46,049
                                                                                                         ---------
                                                                                                         ---------
 
                                       LIABILITIES AND SHAREHOLDERS' EQUITY
 
Current liabilities:
  Accounts payable.....................................................................................  $   3,845
  Accrued expenses.....................................................................................      3,733
  Current portion of long-term debt....................................................................        258
                                                                                                         ---------
    Total current liabilities..........................................................................      7,836
Deferred grant.........................................................................................        136
Long-term debt.........................................................................................      4,632
 
Shareholders' equity:
  Serial preferred stock, par value $.01 per share; authorized 2,000,000 shares; none issued...........
  Common stock, par value $.01 per share; authorized 20,000,000 shares; issued and outstanding shares
    8,042,000 and 8,021,000 shares at June 30, 1998 and December 31, 1997, respectively................         80
  Additional paid-in capital...........................................................................     30,622
  Retained earnings....................................................................................      2,566
  Cumulative translation adjustments...................................................................        177
                                                                                                         ---------
    Total shareholders' equity.........................................................................     33,445
                                                                                                         ---------
    Total liabilities and shareholders' equity.........................................................  $  46,049
                                                                                                         ---------
                                                                                                         ---------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-21
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
                                  (UNAUDITED)
 
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                  THREE MONTHS ENDED       SIX MONTHS ENDED
                                                                       JUNE 30,                JUNE 30,
                                                                ----------------------  ----------------------
<S>                                                             <C>         <C>         <C>         <C>
                                                                   1998        1997        1998        1997
                                                                ----------  ----------  ----------  ----------
Net sales.....................................................  $   13,565  $   11,961  $   26,021  $   24,004
Cost of sales.................................................       7,963       6,900      15,437      13,960
                                                                ----------  ----------  ----------  ----------
    Gross profit..............................................       5,602       5,061      10,584      10,044
Operating expenses:
  Selling, general and administrative.........................       4,075       3,482       7,883       6,832
  Research and development....................................     895,000         974       1,726       2,076
                                                                ----------  ----------  ----------  ----------
    Operating income..........................................         632         605         975       1,136
  Interest income.............................................          78         129         164         273
  Interest expense............................................         (99)       (105)       (199)       (176)
                                                                ----------  ----------  ----------  ----------
Income before income taxes....................................         611         629         940       1,233
Income tax provision..........................................         201         226         310         443
                                                                ----------  ----------  ----------  ----------
    Net income................................................  $      410  $      403  $      630  $      790
                                                                ----------  ----------  ----------  ----------
                                                                ----------  ----------  ----------  ----------
Earnings per share:
  Basic.......................................................  $     0.05  $     0.05  $     0.08  $     0.10
                                                                ----------  ----------  ----------  ----------
                                                                ----------  ----------  ----------  ----------
  Diluted.....................................................  $     0.05  $     0.05  $     0.08  $     0.10
                                                                ----------  ----------  ----------  ----------
                                                                ----------  ----------  ----------  ----------
Weighted average common shares outstanding....................   8,032,000   7,914,000   8,027,000   7,880,000
  Common equivalents:
    Options...................................................       2,000      63,000       2,000      97,000
    Warrants..................................................          --       2,000          --       2,000
                                                                ----------  ----------  ----------  ----------
Weighted average common and common equivalents................   8,034,000   7,979,000   8,029,000   7,979,000
                                                                ----------  ----------  ----------  ----------
                                                                ----------  ----------  ----------  ----------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-22
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                                  (UNAUDITED)
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                               FOR THE SIX MONTHS
                                                                                                 ENDED JUNE 30,
                                                                                              ---------------------
<S>                                                                                           <C>        <C>
                                                                                                1998        1997
                                                                                              ---------  ----------
Cash flows from operating activities:
  Net income................................................................................  $     630  $      790
  Adjustments to reconcile net income to net cash provided by operating activities:
    Depreciation and amortization...........................................................      1,191         737
    Accretion of discount on investments....................................................        (83)       (170)
    Changes in operating assets and liabilities:
      Accounts receivable...................................................................     (1,118)     (1,524)
      Inventories...........................................................................       (197)       (782)
      Other current assets..................................................................        (80)        277
      Accounts payable......................................................................      1,845         758
      Accrued expenses......................................................................        660         393
                                                                                              ---------  ----------
        Net cash provided by operating activities...........................................      2,848         479
                                                                                              ---------  ----------
Cash flows from investing activities:
  Purchase of property, plant and equipment.................................................     (2,090)     (9,911)
  Purchase of investments...................................................................         --      (8,768)
  Proceeds upon sale or maturity of short-term investments..................................      1,844       5,140
  Cash and investments restricted as to use.................................................         --       3,450
  Increase in other assets..................................................................        (11)       (154)
                                                                                              ---------  ----------
    Net cash used in investing activities...................................................       (257)    (10,243)
                                                                                              ---------  ----------
Cash flows from financing activities:
  Net proceeds from sales of common stock...................................................        140         130
  Net proceeds from options exercised.......................................................         --         582
  Borrowings on long-term debt..............................................................         --       5,167
  Principal payments on long-term debt......................................................       (129)        (86)
                                                                                              ---------  ----------
    Net cash provided by financing activities...............................................         11       5,793
                                                                                              ---------  ----------
Effect of exchange rates on cash............................................................         20         (35)
                                                                                              ---------  ----------
Net increase (decrease) in cash and cash equivalents........................................      2,622      (4,006)
Cash and cash equivalents at beginning of period............................................      1,215       6,114
                                                                                              ---------  ----------
Cash and cash equivalents at end of period..................................................  $   3,837       2,108
                                                                                              ---------  ----------
                                                                                              ---------  ----------
Significant non-cash investing and financing transactions:
Acquisition of equipment through capital leases.............................................  $      67          --
                                                                                              ---------  ----------
                                                                                              ---------  ----------
Use of restricted funds for purchase of the U.S. facility...................................         --  $    1,000
                                                                                              ---------  ----------
                                                                                              ---------  ----------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-23
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                                  (UNAUDITED)
 
1. BASIS OF PRESENTATION
 
    The consolidated financial statements included in this Proxy
Statement/Prospectus have been prepared by AVECOR Cardiovascular Inc. (the
Company), without audit, pursuant to the rules and regulations of the Securities
and Exchange Commission (SEC). Certain information and footnote disclosures
normally included in financial statements prepared in accordance with generally
accepted accounting principles have been condensed, or omitted, pursuant to
these rules and regulations. The year-end balance sheet was derived from audited
financial statements, but does not include all disclosures required by generally
accepted accounting principles. These unaudited consolidated interim financial
statements should be read in conjunction with the audited financial statements
and related notes included elsewhere in this Proxy Statement/Prospectus.
 
    The consolidated interim financial statements presented herein as of June
30, 1998 and for the three and six month periods ended June 30, 1998 and 1997
reflect, in the opinion of management, all adjustments (which include only
normal, recurring adjustments) necessary for a fair presentation of financial
position and the results of operations and cash flows for the periods presented.
The results of operations for any interim period are not necessarily indicative
of results for the full year.
 
ORGANIZATION
 
    The Company was incorporated on December 13, 1990. The Company designs,
develops, manufactures and markets specialty medical devices for heart/lung
bypass surgery and long-term respiratory support.
 
    The consolidated financial statements include the accounts of AVECOR
Cardiovascular Inc. and its wholly-owned subsidiaries, AVECOR Cardiovascular
Ltd. and AVECOR Foreign Sales Corporation after elimination of all significant
intercompany transactions and accounts.
 
3. INVENTORIES
 
    Inventories consist of the following:
 
<TABLE>
<CAPTION>
                                                                                   JUNE 30,
                                                                                     1998
                                                                                 -------------
<S>                                                                              <C>
Raw materials..................................................................  $   3,735,000
Work-in-process................................................................      2,121,000
Finished goods.................................................................      4,981,000
                                                                                 -------------
                                                                                 $  10,837,000
                                                                                 -------------
                                                                                 -------------
</TABLE>
 
4. INDUSTRY SEGMENT INFORMATION
 
    The Company distributes its products through its direct sales force and
independent sales representatives in the United States, Canada, the United
Kingdom and France. Additionally, the Company distributes its products through
foreign independent distributors who then market the products directly to
medical institutions. No one independent distributor or other customer accounted
for 10% or more of the Company's net sales for the six months ended June 30,
1998 or 1997.
 
                                      F-24
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
4. INDUSTRY SEGMENT INFORMATION (CONTINUED)
    Total export sales from the U.S. to unaffiliated entities (primarily to
Europe and payable in U.S. dollars) were $1,960,000 and $3,338,000 for the three
and six month periods ended June 30, 1998, respectively, compared to $1,248,000
and $2,563,000 for the three and six month periods ended June 30, 1997,
respectively. Sales to customers located outside of the United States were
approximately 41% and 40% of net sales for the three and six month periods ended
June 30, 1998, respectively, compared to 41% for the three and six month periods
ended June 30, 1997.
 
    At June 30, 1998, consolidated accounts receivable included $4,943,000 due
from customers located outside of the U.S.
 
    In June 1997, the Financial Accounting Standards Board issued Statement 131,
"Disclosures About Segments of an Enterprise and Related Information," a new
standard of reporting information about operating or business segments in
financial statements. The new standard will be effective for the Company's
annual financial statements in 1998. Although the Company has not specifically
evaluated what impact, if any, this new standard will have on the Company's
current reporting of operating and business segments, the Company believes it
will continue reporting as one operating and business segment.
 
5. COMPREHENSIVE INCOME
 
    In the first quarter of 1998, the Company adopted Statement of Financial
Accounting Standards No. 130, "Reporting Comprehensive Income." The standard
requires the display and reporting of comprehensive income, which includes all
changes in shareholders' equity with the exception of additional investments by
shareholders or distributions to shareholders. Comprehensive income for the
Company includes net income and foreign currency translation which is charged or
credited to the cumulative translation account within shareholders' equity.
Comprehensive income for the three and six months ended June 30, 1998 and 1997
and the year ended December 31, 1997, was as follows:
 
<TABLE>
<CAPTION>
                                                                     THREE MONTHS ENDED      SIX MONTHS ENDED,
                                                                          JUNE 30,                JUNE 30,
                                                                   ----------------------  ----------------------
<S>                                                                <C>         <C>         <C>         <C>
                                                                      1998        1997        1998        1997
                                                                   ----------  ----------  ----------  ----------
Net income.......................................................  $  410,000  $  403,000  $  630,000  $  790,000
Changes in cumulative translation................................      (9,000)     74,000      58,000     (90,000)
                                                                   ----------  ----------  ----------  ----------
Comprehensive income.............................................  $  401,000  $  477,000  $  688,000  $  700,000
                                                                   ----------  ----------  ----------  ----------
                                                                   ----------  ----------  ----------  ----------
</TABLE>
 
6. PATENT MATTERS
 
    In March 1997, the Company filed suit in U.S. District Court for the
District of Minnesota, seeking to invalidate a newly issued U.S. patent held by
a competing manufacturer of blood oxygenators and other medical devices, and
requesting a determination that the Company's AFFINITY oxygenator does not
infringe the competitor's patent. The Company filed suit in response to a
December 1996 letter from the competitor, alleging that the AFFINITY oxygenator
infringes certain claims under the competitor's patent, and requesting
discussion regarding a possible license agreement. The Company reviewed the
subject patent and concluded, based on an opinion from its patent counsel, that
none of the claims in the patent are infringed by the AFFINITY oxygenator, and
that the patent is, in any event, invalid. On October 6, 1997, the Magistrate
Judge of the U.S. District Court vacated a previous order and granted a stay in
the proceedings,
 
                                      F-25
<PAGE>
                           AVECOR CARDIOVASCULAR INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
6. PATENT MATTERS (CONTINUED)
including the suspension of discovery, pending the outcome of the competitor's
request for re-issuance of the aforementioned patent. The expense and effort
potentially required to bring this action, as well as the outcome of any
counterclaim successfully brought against the Company by the competitor, could
have a material adverse effect on the Company's business, financial condition
and results of operations.
 
7. ACQUISITION OF THE COMPANY
 
    On July 12, 1998, Medtronic, Inc. ("Medtronic") and the Company entered into
an agreement under which Medtronic will acquire the Company in a transaction
valued at approximately $91 million. The transaction calls for the Company's
shareholders to receive $11.125 in Medtronic stock for each share of the
Company's stock they hold at the transaction close date. In addition to
shareholder approval, the transaction is subject to customary conditions
including Hart-Scott-Rodino clearance. The companies expect completion of the
transaction in late 1998.
 
                                      F-26
<PAGE>
   
                                   APPENDIX A
    
 
   
                                 PLAN OF MERGER
                                       OF
                                AC MERGER CORP.
                                      INTO
                           AVECOR CARDIOVASCULAR INC.
    
 
                                   ARTICLE 1
                       NAMES OF CONSTITUENT CORPORATIONS
 
   
    1.1  CONSTITUENT CORPORATIONS.  The names of the Constituent Corporations
are AC Merger Corp., a Minnesota corporation ("Merger Subsidiary"), and AVECOR
Cardiovascular Inc., a Minnesota corporation (the "Company"). The Constituent
Corporations shall be combined by the merger of Merger Subsidiary into the
Company as the Surviving Corporation (the "Merger"), pursuant to the applicable
provisions of the Minnesota Business Corporation Act ("MBCA").
    
 
    1.2  CERTAIN DEFINITIONS.  As used in this Plan of Merger, the following
capitalized terms shall have the following meanings:
 
        (a) "Company Common Stock" means common stock of the Company, par value
    $.01 per share.
 
        (b) "Company Options" means all options to purchase shares of Company
    Common Stock that are outstanding at the Effective Time.
 
        (c) "Conversion Fraction" means as defined in Section 2.2(a) hereof.
 
        (d) "Merger Agreement" means that certain Agreement and Plan of Merger
    dated July 12, 1998, by and among Medtronic, Inc., a Minnesota corporation
    and sole shareholder of Merger Subsidiary ("Parent"), Merger Subsidiary, and
    the Company, a copy of which shall be maintained at the Surviving
    Corporation's principal executive office and made available to any
    shareholder of either Constituent Corporation upon request.
 
        (e) "Merger Subsidiary Common Stock" means common stock of Merger
    Subsidiary, par value $.01 per share.
 
        (f) "Parent Average Stock Price" shall mean the average (rounded to the
    nearest full cent, with the cents rounded up if the third decimal place is 5
    or more) of the daily closing sale prices of a share of Parent Common Stock
    as reported on the New York Stock Exchange ("NYSE") Composite Tape, as
    reported in The Wall Street Journal, for the 18 consecutive NYSE trading
    days ending on and including the second NYSE trading day immediately
    preceding the Effective Time.
 
        (g) "Parent Common Stock" means common stock of Parent, par value $.10
    per share.
 
        (h) "Surviving Corporation" means the Company as the surviving
    corporation of the merger of Merger Subsidiary with and into the Company.
 
        (i) "Surviving Corporation Common Stock" means common stock of the
    Surviving Corporation, par value $.01 per share.
 
                                   ARTICLE 2
                              TERMS AND CONDITIONS
 
    2.1  MERGER; EFFECTIVE TIME.  The Merger shall be effective upon the filing
with the Minnesota Secretary of State of Articles of Merger including this Plan
of Merger and such other documents as are
 
                                      A-1
<PAGE>
required by the MBCA to be filed with the Secretary of State of Minnesota (the
time of such filing being the "Effective Time"). At the Effective Time, the
separate existence of Merger Subsidiary shall cease and the Company shall alone
continue in existence as the Surviving Corporation. All transactions on and
after the Effective Time shall be deemed transactions of and for the account of
the Company as the Surviving Corporation.
 
    2.2  CONVERSION OF SHARES.  At the Effective Time, by virtue of the Merger
and without any action on the part of any holder of any share of capital stock
of the Company or Merger Subsidiary:
 
        (a) Each share of Company Common Stock issued and outstanding
    immediately prior thereto (except for Dissenting Shares, as defined in
    Section 2.3 hereof, and except for shares referred to in Section 2.2(b)
    hereof) shall be converted into the right to receive the fraction of a share
    (subject to adjustment as provided below, the "Conversion Fraction") of
    Parent Common Stock equal to $11.125 divided by the Parent Average Stock
    Price.
 
        Notwithstanding the foregoing, if the sum of the number of shares of
    Company Common Stock outstanding immediately prior to the Effective Time
    plus the number of shares subject to then outstanding options, warrants, or
    other rights to acquire shares of Company Common Stock (collectively,
    "Company Stock Acquisition Rights") is greater than 8,879,725 shares plus
    that number of shares issuable pursuant to the current offering period in
    process as of the date of the Merger Agreement under the Company's Employee
    Stock Purchase Plan or if the aggregate exercise price of all such Company
    Stock Acquisition Rights then outstanding is less than the aggregate
    exercise price reflected in Section 3.4 of the Merger Agreement, then the
    $11.125 amount per share of Company Common Stock, as described above, shall
    be reduced to an amount, if lower, equal to (i) $11.125 times [8,879,725
    shares plus that number of shares issuable pursuant to the current offering
    period in process as of the date of the Merger Agreement under the Company's
    Employee Stock Purchase Plan] minus the aggregate exercise price reflected
    in Section 3.4 of the Merger Agreement plus the aggregate amount received by
    the Company as a result of any issuance of Company Common Stock after the
    date of this Agreement and prior to the Effective Time plus the aggregate
    exercise price of all Company Stock Acquisition Rights outstanding
    immediately prior to the Effective Time divided by (ii) the sum of (A) the
    number of shares of Company Common Stock outstanding immediately prior to
    the Effective Time plus (B) the number of shares subject to Company Stock
    Acquisition Rights then outstanding.
 
        An appropriate adjustment shall similarly be made in the event that,
    prior to the Effective Time, the outstanding shares of Company Common Stock,
    without new consideration, are changed into or exchanged for a different
    kind of shares or securities through a reorganization, reclassification,
    stock dividend, stock combination, or other like change in the Company's
    capitalization. Notwithstanding the foregoing, nothing in this section shall
    be deemed to constitute authorization or permission for or consent from
    Parent or Merger Subsidiary to any increase in the number of shares of
    Company Common Stock outstanding or subject to outstanding Company Stock
    Acquisition Rights, to any decrease in the exercise price of such Rights, or
    to any reorganization, reclassification, stock dividend, stock combination,
    or other like change in capitalization.
 
        (b) Each share of Company Common Stock issued and outstanding
    immediately prior to the Effective Time that is then owned beneficially or
    of record by Parent, Merger Subsidiary, or any direct or indirect subsidiary
    of Parent or the Company shall be cancelled without payment of any
    consideration therefor and without any conversion thereof.
 
        (c) Each share of any other class of capital stock of the Company (other
    than Company Common Stock) shall be cancelled without payment of any
    consideration therefor and without any conversion thereof.
 
                                      A-2
<PAGE>
        (d) Each share of Merger Subsidiary Common Stock issued and outstanding
    immediately prior to the Effective Time shall be converted into one share of
    Surviving Corporation Common Stock.
 
    2.3  DISSENTING SHARES.  Notwithstanding any provision of the Merger
Agreement to the contrary, each outstanding share of Company Common Stock, the
holder of which has demanded and perfected such holder's right to dissent from
the Merger and to be paid the fair value of such shares in accordance with
Sections 302A.471 and 302A.473 of the MBCA and, as of the Effective Time, has
not effectively withdrawn or lost such dissenters' rights ("Dissenting Shares"),
shall not be converted into or represent a right to receive the Parent Common
Stock into which shares of Company Common Stock are converted pursuant to
Section 2.2 hereof, but the holder thereof shall be entitled only to such rights
as are granted by the MBCA. Parent shall cause the Company to make all payments
to holders of shares of Company Common Stock with respect to such demands in
accordance with the MBCA. The Company shall give Parent (i) prompt written
notice of any notice of intent to demand fair value for any shares of Company
Common Stock, withdrawals of such notices, and any other instruments served
pursuant to the MBCA or any other provisions of Minnesota law and received by
the Company, and (ii) the opportunity to conduct jointly all negotiations and
proceedings with respect to demands for fair value for shares of Company Common
Stock under the MBCA. The Company shall not, except with the prior written
consent of Parent, voluntarily make any payment with respect to any demands for
fair value for shares of Company Common Stock or offer to settle or settle any
such demands.
 
    2.4  EXCHANGE OF COMPANY COMMON STOCK.
 
        (a) Promptly after the Effective Time, Parent shall cause Parent's stock
    transfer agent or such other person as Parent may appoint to act as exchange
    agent (the "Exchange Agent") to mail to each holder of record (other than
    Parent, Merger Subsidiary, or any other subsidiary of Parent or the Company)
    of a certificate or certificates that immediately prior to the Effective
    Time represented outstanding shares of Company Common Stock ("Company
    Certificates") a form letter of transmittal (which shall specify that
    delivery shall be effective, and risk of loss and title to the Company
    Certificate(s) shall pass, only upon delivery of the Company Certificate(s)
    to the Exchange Agent) and instructions for such holder's use in effecting
    the surrender of the Company Certificates in exchange for certificates
    representing shares of Parent Common Stock.
 
        (b) As soon as practicable after the Effective Time, the Exchange Agent
    shall distribute to holders of shares of Company Common Stock, upon
    surrender to the Exchange Agent of one or more Company Certificates for
    cancellation, together with a duly-executed letter of transmittal, (i) one
    or more Parent certificates representing the number of whole shares of
    Parent Common Stock into which the shares represented by the Company
    Certificate(s) shall have been converted pursuant to Section 2.2(a), and
    (ii) a bank check in the amount of cash into which the shares represented by
    the Company Certificate(s) shall have been converted pursuant to Section
    2.4(f) (relating to fractional shares), and the Company Certificate(s) so
    surrendered shall be cancelled. In the event of a transfer of ownership of
    Company Common Stock that is not registered in the transfer records of the
    Company, it shall be a condition to the issuance of shares of Parent Common
    Stock that the Company Certificate(s) so surrendered shall be properly
    endorsed or be otherwise in proper form for transfer and that such
    transferee shall (i) pay to the Exchange Agent any transfer or other taxes
    required, or (ii) establish to the satisfaction of the Exchange Agent that
    such tax has been paid or is not payable.
 
        (c) Holders of Company Common Stock will be entitled to any dividends or
    other distributions pertaining to the Parent Common Stock received in
    exchange therefor that become payable to persons who are holders of record
    of Parent Common Stock as of a record date on the same date as or after the
    Effective Time, but only after they have surrendered their Company
    Certificates for exchange. Subject to the effect, if any, of applicable law,
    the Exchange Agent shall receive, hold, and remit any such dividends or
    other distributions to each such record holder entitled thereto, without
    interest, at the time that such Company Certificates are surrendered to the
    Exchange Agent for exchange.
 
                                      A-3
<PAGE>
    Holders of Company Common Stock will not be entitled, however, to dividends
    or other distributions that become payable before or after the Effective
    Time to persons who were holders of record of Parent Common Stock as of a
    record date that is prior to the Effective Time.
 
        (d) All shares of Parent Common Stock issued upon the surrender for
    exchange of Company Common Stock in accordance with the terms hereof
    (including any cash paid for fractional shares pursuant to Section 2.4(f)
    hereof) shall be deemed to have been issued in full satisfaction of all
    rights pertaining to such shares of Company Common Stock.
 
        (e) After the Effective Time, there shall be no further registration of
    transfers on the stock transfer books of the Surviving Corporation of the
    shares of Company Common Stock that were outstanding immediately prior to
    the Effective Time. If, after the Effective Time, Company Certificates
    representing such shares are presented to the Surviving Corporation, they
    shall be cancelled and exchanged as provided in this Article 2. As of the
    Effective Time, the holders of Company Certificates representing shares of
    Company Common Stock shall cease to have any rights as shareholders of the
    Company, except such rights, if any, as they may have pursuant to the MBCA.
    Except as provided above, until such Company Certificates are surrendered
    for exchange, each such Company Certificate shall, after the Effective Time,
    represent for all purposes only the right to receive the number of whole
    shares of Parent Common Stock into which the shares of Company Common Stock
    shall have been converted pursuant to the Merger as provided in Section
    2.2(a) hereof and the right to receive the cash value of any fraction of a
    share of Parent Common Stock as provided in Section 2.4(f) hereof.
 
        (f) No fractional shares of Parent Common Stock and no certificates or
    scrip therefor, or other evidence of ownership thereof, shall be issued upon
    the surrender for exchange of Company Certificates, no dividend or other
    distribution of Parent shall relate to any fractional share, and such
    fractional share interests shall not entitle the owner thereof to vote or to
    any rights of a shareholder of Parent. All fractional shares of Parent
    Common Stock to which a holder of Company Common Stock immediately prior to
    the Effective Time would otherwise be entitled, at the Effective Time, shall
    be aggregated if and to the extent multiple Company Certificates of such
    holder are submitted together to the Exchange Agent. If a fractional share
    results from such aggregation, then (in lieu of such fractional share) the
    Exchange Agent shall pay to each holder of shares of Company Common Stock
    who otherwise would be entitled to receive such fractional share of Parent
    Common Stock an amount of cash (without interest) determined by multiplying
    (i) the Parent Average Stock Price by (ii) the fractional share of Parent
    Common Stock to which such holder would otherwise be entitled. Parent will
    make available to the Exchange Agent any cash necessary for this purpose.
 
        (g) In the event any Company Certificates shall have been lost, stolen,
    or destroyed, the Exchange Agent shall issue in exchange for such lost,
    stolen, or destroyed Company Certificates, upon the making of an affidavit
    of that fact by the holder thereof, such shares of Parent Common Stock and
    cash for fractional shares, if any, as may be required pursuant to this
    Article 2; provided, however, that Parent may, in its discretion and as a
    condition precedent to the issuance thereof, require the owner of such lost,
    stolen, or destroyed Company Certificate to deliver a bond in such sum as
    Parent may direct as indemnity against any claim that may be made against
    Parent or the Exchange Agent with respect to such Company Certificate
    alleged to have been lost, stolen, or destroyed.
 
        (h) Each person entitled to receive shares of Parent Common Stock
    pursuant to this Article 2 shall receive together with such shares the
    number of Parent preferred share purchase rights (pursuant to the Rights
    Agreement dated as of June 27, 1991, between Parent and Norwest Bank
    Minnesota, N.A., the "Parent Rights Plan") per share of Parent Common Stock
    equal to the number of Parent preferred share purchase rights associated
    with one share of Parent Common Stock at the Effective Time.
 
    2.5  EXCHANGE OF MERGER SUBSIDIARY COMMON STOCK.  From and after the
Effective Time, each outstanding certificate previously representing shares of
Merger Subsidiary Common Stock shall be
 
                                      A-4
<PAGE>
deemed for all purposes to evidence ownership of and to represent the number of
shares of Surviving Corporation Common Stock into which such shares of Merger
Subsidiary Common Stock shall have been converted. Promptly after the Effective
Time, the Surviving Corporation shall issue to Parent a stock certificate or
certificates representing such shares of Surviving Corporation Common Stock in
exchange for the certificate or certificates that formerly represented shares of
Merger Subsidiary Common Stock, which shall be cancelled.
 
    2.6  STOCK OPTIONS.
 
        (a) Except as provided below with respect to the Company's Employee
    Stock Purchase Plan, each option to purchase shares of Company Common Stock
    that is outstanding at the Effective Time (a "Company Option") shall, by
    virtue of the Merger and without any action on the part of the holder
    thereof, be assumed by Parent (and a registration statement on Form S-8
    therefor shall be filed promptly after the Effective Time) in such manner
    that Parent (i) is a corporation "assuming a stock option in a transaction
    to which Section 424(a) applies" within the meaning of Section 424 of the
    Code and the regulations thereunder or (ii) to the extent that Section 424
    of the Code does not apply to any such Company Option, would be such a
    corporation were Section 424 of the Code applicable to such Company Option.
    From and after the Effective Time, all references to the Company in the
    Company Options shall be deemed to refer to Parent (other than for purposes
    of determining whether there has been a change in control of the Company).
    The Company Options assumed by Parent shall be exercisable upon the same
    terms and conditions as under the Company Options (including provisions
    thereof, if any, relating to the acceleration of vesting upon a change in
    control of the Company) except that (i) such Company Options shall entitle
    the holder to purchase from Parent the number of shares of Parent Common
    Stock (rounded to the nearest whole number of such shares) that equals the
    product of the Conversion Fraction multiplied by the number of shares of
    Company Common Stock subject to such option immediately prior to the
    Effective Time, and (ii) the option exercise price per share of Parent
    Common Stock shall be an amount (rounded to the nearest full cent) equal to
    the option exercise price per share of Company Common Stock in effect
    immediately prior to the Effective Time divided by the Conversion Fraction;
    provided, however, that in the case of any Company Option to which Section
    421 of the Code applies by reason of its qualification under Section 422 of
    the Code ("incentive stock option"), the option price, the number of shares
    purchasable pursuant to such option and the terms and conditions of exercise
    of such options shall be determined in order to comply with Section 424(a)
    of the Code. As promptly as practicable after the Effective Time, Parent
    shall issue to each holder of a Company Option a written instrument
    informing such holder of the assumption by Parent of such Company Option.
 
        (b) The current offering period in process as of the date of the Merger
    Agreement under the Company's Employee Stock Purchase Plan shall continue
    and shares shall be issued to participants thereunder as provided under, and
    subject to the terms and conditions of, such Plan; provided, however, that
    if the Effective Time occurs prior to the originally scheduled expiration of
    such current offering period on September 30, 1998, then immediately prior
    to the Effective Time, the current offering period under the Company's
    Employee Stock Purchase Plan shall be ended, and each participant shall be
    deemed to have purchased immediately prior to the Effective Time, to the
    extent of payroll deductions accumulated by such participant as of such
    offering period end, the number of whole shares of Company Common Stock at a
    per share price determined pursuant to the provisions of the Company's
    Employee Stock Purchase Plan, and each participant shall receive a cash
    payment equal to the balance, if any, of such accumulated payroll deductions
    remaining after such purchase of such shares. As of the Effective Time, all
    such shares shall be converted in the manner provided in Section 2.2. No
    offering periods under the Company's Employee Stock Purchase Plan that are
    subsequent to the current offering period in process as of the date of the
    Merger Agreement shall be commenced, and, the Company's Employee Stock
    Purchase Plan and all purchase rights thereunder shall terminate effective
    as of the Effective Time.
 
                                      A-5
<PAGE>
    2.7  CAPITALIZATION CHANGES.  If, between the date of the Merger Agreement
and the Effective Time, the outstanding shares of Parent Common Stock shall have
been changed into a different number of shares or a different class by reason of
any reclassification, recapitalization, split-up, combination, exchange of
shares, or stock dividend, the Conversion Fraction and all per-share price
amounts and calculations set forth in the Merger Agreement shall be
appropriately adjusted.
 
                                   ARTICLE 3
                   ORGANIZATION OF THE SURVIVING CORPORATION
 
    3.1  ARTICLES OF INCORPORATION OF THE SURVIVING CORPORATION.  The Articles
of Incorporation of the Company, as the Surviving Corporation, shall, as of the
Effective Time, be amended so as to be restated in their entity to read as set
forth on Schedule A-1 attached to this Plan of Merger.
 
    3.2  BYLAWS OF THE SURVIVING CORPORATION.  The Bylaws of Merger Subsidiary,
as in effect immediately prior to the Effective Time, shall be the Bylaws of the
Surviving Corporation until thereafter amended in accordance with applicable
law.
 
    3.3  DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION.  The directors and
officers of Merger Subsidiary immediately prior to the Effective Time shall be
the directors and officers, respectively, of the Surviving Corporation until
their respective successors shall be duly elected and qualified.
 
                                   ARTICLE 4
                               GENERAL PROVISIONS
 
    4.1  CERTAIN EFFECTS OF THE MERGER.  As of the Effective Time, the Company,
as the Surviving Corporation, shall succeed to and possess all the rights,
privileges, powers, immunities, franchises, concessions, certificates and
authority, of a public as well as a private nature, of each of the Constituent
Corporations; and all property, real, personal and mixed, and every interest
therein, and all other choses in action of or belonging to either of the
Constituent Corporations on whatever account shall be vested in the Company as
the Surviving Corporation, without any further act or deed; and all property,
assets, rights, privileges, powers, immunities, franchises, concessions,
certificates and authority shall be thereafter as effectively the property of
the Company, as the Surviving Corporation, as they were or would be of the
Constituent Corporations or either of them; and title to any real estate or any
interest therein vested by deed or otherwise in either of the Constituent
Corporations shall not revert or be in any way impaired by reason of the Merger.
 
    4.2  RIGHTS AND DUTIES OF SURVIVING CORPORATION.  The Company, as the
Surviving Corporation, shall be responsible and liable for all the debts,
liabilities, duties and obligations of each of the Constituent Corporations, and
as of the Effective Time all such debts, liabilities, duties and obligations
shall attach to the Company, as the Surviving Corporation, and may be enforced
against it to the same extent as if such debts, liabilities, duties and
obligations had been originally incurred or contracted by it; and any claim
existing or action or proceeding pending by or against either of the Constituent
Corporations may be prosecuted to judgment as if the merger had not taken place;
or the Company, as the Surviving Corporation, may be substituted in its place;
and neither the rights of creditors nor any liens upon property of either of the
Constituent Corporations shall be impaired by the merger.
 
    4.3  FURTHER ASSURANCES.  If at any time after the Effective Time the
Surviving Corporation shall consider or be advised that any instruments of
further assurance are desirable in order to evidence the vesting in it of the
title of either of the Constituent Corporations to any of the property rights of
the Constituent Corporations, the appropriate officers or directors of Merger
Subsidiary and the Company are hereby authorized to execute, acknowledge, and
deliver all such instruments of further assurance and to do all acts or things,
either in the name of Merger Subsidiary or the Company, as may be requisite or
desirable to carry out the provisions hereof.
 
                                      A-6
<PAGE>
   
                                                                    SCHEDULE A-1
    
 
   
                       RESTATED ARTICLES OF INCORPORATION
                                       OF
                           AVECOR CARDIOVASCULAR INC.
    
 
   
                                ARTICLE 1--NAME
    
 
   
   1.1)  The name of the corporation shall be Medtronic AVECOR Cardiovascular,
Inc.
    
 
   
                     ARTICLE 2--REGISTERED OFFICE AND AGENT
    
 
   
   2.1)  The registered office of the corporation in the State of Minnesota is
405 Second Avenue South, Minneapolis, Minnesota 55401. The name of its
registered agent at such address is CT Corporation System, Inc.
    
 
   
                                ARTICLE 3--STOCK
    
 
   
    3.1)  AUTHORIZED SHARES.  The aggregate number of shares the corporation has
authority to issue shall be 2,500 shares of Common Stock, $.10 par value.
Holders of Common Stock shall be entitled to one vote for each share of Common
Stock held of record.
    
 
   
    3.2)  ISSUANCE OF SHARES TO HOLDERS OF ANOTHER CLASS OR SERIES.  The Board
of Directors is authorized to issue shares of the corporation of one class or
series to holders of that class or series or to holders of another class or
series to effectuate share dividends or splits.
    
 
   
                       ARTICLE 4--RIGHTS OF SHAREHOLDERS
    
 
   
    4.1)  NO PREEMPTIVE RIGHTS.  No holder of any class of stock of the
corporation shall be entitled to subscribe for or purchase such holder's
proportionate share of stock of any class of the corporation now or hereafter
authorized or issued.
    
 
   
    4.2)  NO CUMULATIVE VOTING RIGHTS.  No shareholder shall be entitled to
cumulate votes for the election of directors and there shall be no cumulative
voting for any purpose whatsoever.
    
 
   
    4.3)  VOTING AGREEMENTS.  A written agreement among shareholders or
subscribers for shares to be issued, relating to the voting of their shares, is
valid and specifically enforceable by and against the parties to the agreement
under Section 302A.455 of the Minnesota Statutes.
    
 
   
                     ARTICLE 5--WRITTEN ACTION BY DIRECTORS
    
 
   
   5.1)  Any action required or permitted to be taken at a Board meeting may be
taken by written action signed by all of the directors or, in cases where the
action need not be approved by the shareholders, by written action signed by the
number of directors that would be required to take the same action at a meeting
of the Board at which all directors were present.
    
 
   
                  ARTICLE 6--LIMITATION OF DIRECTOR LIABILITY
    
 
   
   6.1)  A director of the corporation shall not be personally liable to the
corporation or its shareholders for monetary damages for breach of fiduciary
duty as a director, except to the extent provided by applicable law (i) for any
breach of the director's duty of loyalty to the corporation or its shareholders,
(ii) for acts or omissions not in good faith or that involve intentional
misconduct or a knowing violation of law, (iii) under Sections 302A.559 or
80A.23 of the Minnesota Statutes, as amended, (iv) for any transaction from
which the director derived an improper personal benefit, or (v) for any act or
omission occurring prior to the date that this Article becomes effective. No
amendment to or repeal of this Article shall apply to or have any effect on the
liability or alleged liability of any director of the corporation for or with
respect to any acts or omissions of such director occurring prior to such
amendment or repeal.
    
 
                                      A-7
<PAGE>
   
                                   APPENDIX B
    
 
   
                            AGREEMENT AND PLAN OF MERGER
                                  BY AND AMONG
                                MEDTRONIC, INC.,
                                AC MERGER CORP.,
                                      AND
                           AVECOR CARDIOVASCULAR INC.
    
 
                                 JULY 12, 1998
 
                                      B-1
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<S>        <C>        <C>                                                                        <C>
ARTICLE 1             THE MERGER; CONVERSION OF SHARES.........................................        B-5
                 1.1  The Merger...............................................................        B-5
                 1.2  Effective Time...........................................................        B-5
                 1.3  Conversion of Shares.....................................................        B-6
                 1.4  Dissenting Shares........................................................        B-7
                 1.5  Exchange of Company Common Stock.........................................        B-7
                 1.6  Exchange of Merger Subsidiary Common Stock...............................        B-9
                 1.7  Stock Options............................................................        B-9
                 1.8  Capitalization Changes...................................................       B-10
                 1.9  Articles of Incorporation of the Surviving Corporation...................       B-10
                1.10  Bylaws of the Surviving Corporation......................................       B-10
                1.11  Directors and Officers of the Surviving Corporation......................       B-11
 
ARTICLE 2             CLOSING..................................................................       B-11
                 2.1  Time and Place...........................................................       B-11
                 2.2  Filings at the Closing...................................................       B-11
 
ARTICLE 3             REPRESENTATIONS AND WARRANTIES OF THE COMPANY............................       B-11
                 3.1  Disclosure Schedule......................................................       B-11
                 3.2  Organization.............................................................       B-11
                 3.3  Authorization............................................................       B-12
                 3.4  Capitalization...........................................................       B-12
                 3.5  Reports and Financial Statements.........................................       B-13
                 3.6  Absence of Undisclosed Liabilities.......................................       B-14
                 3.7  Consents and Approvals...................................................       B-14
                 3.8  Compliance with Laws.....................................................       B-15
                 3.9  Litigation...............................................................       B-15
                3.10  Absence of Material Adverse Changes......................................       B-15
                3.11  Environmental Laws and Regulations.......................................       B-16
                3.12  Officers, Directors and Employees........................................       B-17
                3.13  Taxes....................................................................       B-17
                3.14  Contracts................................................................       B-18
                3.15  Title to Properties; Liens...............................................       B-19
                3.16  Permits, Licenses, Etc...................................................       B-19
                3.17  Intellectual Property Rights.............................................       B-19
                3.18  Benefit Plans............................................................       B-20
                3.19  Minute Books.............................................................       B-22
                3.20  Insurance Policies.......................................................       B-22
                3.21  Bank Accounts............................................................       B-22
                3.22  Powers of Attorney.......................................................       B-22
                3.23  Product Liability Claims.................................................       B-22
                3.24  Warranties...............................................................       B-22
                3.25  Inventories..............................................................       B-22
                3.26  Relations with Suppliers and Customers...................................       B-23
                3.27  No Finders...............................................................       B-23
                3.28  Proxy Statement..........................................................       B-23
                3.29  Merger Filings...........................................................       B-23
                3.30  Fairness Opinion.........................................................       B-24
                3.31  State Takeover Laws......................................................       B-24
</TABLE>
 
                                      B-2
<PAGE>
<TABLE>
<S>        <C>        <C>                                                                        <C>
ARTICLE 4             REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER
                      SUBSIDIARY...............................................................       B-24
                 4.1  Organization.............................................................       B-24
                 4.2  Authorization............................................................       B-25
                 4.3  Capitalization...........................................................       B-25
                 4.4  Consents and Approvals...................................................       B-25
                 4.5  Reports; Financial Statements; Absence of Changes........................       B-26
                 4.6  Registration Statement...................................................       B-27
                 4.7  Merger Filings...........................................................       B-27
                 4.8  No Finders...............................................................       B-27
 
ARTICLE 5             COVENANTS................................................................       B-27
                 5.1  Conduct of Business of the Company.......................................       B-27
                 5.2  No Solicitation..........................................................       B-30
                 5.3  Access and Information...................................................       B-31
                 5.4  Approval of Shareholders; Proxy Statement; Registration Statement........       B-31
                 5.5  Consents.................................................................       B-32
                 5.6  Affiliates' Letters......................................................       B-33
                 5.7  Expenses.................................................................       B-33
                 5.8  Further Actions..........................................................       B-33
                 5.9  Regulatory Approvals.....................................................       B-33
                5.10  Certain Notifications....................................................       B-34
                5.11  Voting of Shares.........................................................       B-34
                5.12  Noncompetition Agreements................................................       B-34
                5.13  NYSE Listing Application.................................................       B-34
                5.14  Indemnification..........................................................       B-34
                5.15  .........................................................................
                5.16  Subsidiary Shares........................................................       B-35
                5.17  Stock Option Agreement...................................................       B-35
                5.18  Benefit Plans and Employee Matters.......................................       B-35
                5.19  Tax......................................................................       B-35
 
ARTICLE 6             CLOSING CONDITIONS.......................................................       B-35
                 6.1  Conditions to Obligations of Parent, Merger Subsidiary, and the
                      Company..................................................................       B-35
                 6.2  Conditions to Obligations of Parent and Merger Subsidiary................       B-36
                 6.3  Conditions to Obligations of the Company.................................       B-37
 
ARTICLE 7             TERMINATION AND ABANDONMENT..............................................       B-38
                 7.1  Termination..............................................................       B-38
                 7.2  Effect of Termination....................................................       B-39
 
ARTICLE 8             MISCELLANEOUS............................................................       B-40
                 8.1  Amendment and Modification...............................................       B-40
                 8.2  Waiver of Compliance; Consents...........................................       B-40
                 8.3  Investigation; Survival of Representations and Warranties................       B-40
                 8.4  Notices..................................................................       B-41
                 8.5  Assignment...............................................................       B-42
</TABLE>
 
                                      B-3
<PAGE>
<TABLE>
<S>        <C>        <C>                                                                        <C>
                 8.6  Governing Law............................................................       B-42
                 8.7  Counterparts.............................................................       B-42
                 8.8  Knowledge................................................................       B-42
                 8.9  Interpretation...........................................................       B-42
                8.10  Publicity................................................................       B-42
                8.11  Entire Agreement.........................................................       B-42
</TABLE>
 
<TABLE>
<S>           <C>
EXHIBITS:
 
Exhibit A:    Form of Plan of Merger
Exhibit B:    Form of Affiliate's Letter
Exhibit C:    Form of Agreement to Facilitate Merger
Exhibit D:    Form of Noncompetition Agreement
Exhibit E:    Form of Stock Option Agreement
Exhibit F:    Form of Opinion of the Company's Counsel
Exhibit G:    Form of Opinion of Parent's Counsel
</TABLE>
 
                                      B-4
<PAGE>
                          AGREEMENT AND PLAN OF MERGER
 
   
    THIS AGREEMENT is dated as of July 12, 1998, by and among MEDTRONIC, INC., a
Minnesota corporation ("Parent"), AC MERGER CORP., a Minnesota corporation and
wholly-owned subsidiary of Parent ("Merger Subsidiary"), and AVECOR
CARDIOVASCULAR INC., a Minnesota corporation (the "Company").
    
 
    WHEREAS, the Boards of Directors of Parent, Merger Subsidiary, and the
Company have approved the merger of Merger Subsidiary with and into the Company
(the "Merger") upon the terms and subject to the conditions set forth herein;
and
 
    WHEREAS, for federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization within the meaning of Section 368(a)(1)(A) and
(a)(2)(E) of the Internal Revenue Code of 1986, as amended (the "Code"); and
 
    WHEREAS, prior to the execution of the Stock Option Agreement described in
Section 5.17, officers and directors of the Company have, to induce Parent to
execute this Agreement, executed and delivered to Parent the Agreements to
Facilitate Merger described in Section 5.11; and
 
    WHEREAS, as a further and subsequent inducement to have Parent execute this
Agreement, Parent and the Company are entering into the Stock Option Agreement
described in Section 5.17 hereof after execution and delivery of the Agreements
to Facilitate Merger described in Section 5.11; and
 
    WHEREAS, the parties hereto desire to make certain representations,
warranties, and agreements in connection with the Merger and also to prescribe
various conditions to the Merger;
 
    NOW, THEREFORE, in consideration of the foregoing premises and the mutual
representations, warranties, covenants, and agreements contained herein, the
parties hereto agree as follows:
 
                                   ARTICLE 1
                        THE MERGER; CONVERSION OF SHARES
 
    1.1  THE MERGER.  Subject to the terms and conditions of this Agreement, at
the Effective Time (as defined in Section 1.2 hereof), Merger Subsidiary shall
be merged with and into the Company in accordance with the provisions of the
Minnesota Business Corporation Act (the "MBCA"), whereupon the separate
corporate existence of Merger Subsidiary shall cease, and the Company shall
continue as the surviving corporation (the "Surviving Corporation"). From and
after the Effective Time, the Surviving Corporation shall possess all the
rights, privileges, powers, and franchises and be subject to all the
restrictions, disabilities, and duties of the Company and Merger Subsidiary, all
as more fully described in the MBCA.
 
    1.2  EFFECTIVE TIME.  As soon as practicable after each of the conditions
set forth in Article 6 has been satisfied or waived, the Company and Merger
Subsidiary will file, or cause to be filed, with the Secretary of State of the
State of Minnesota Articles of Merger for the Merger, which Articles shall be in
the form required by and executed in accordance with the applicable provisions
of the MBCA and shall include as a part thereof a plan of merger (the "Plan of
Merger") substantially in the form attached hereto as Exhibit A. The Merger
shall become effective at the time such filing is made or, if agreed to by
Parent and the Company, such later time or date set forth in the Articles of
Merger (the "Effective Time").
 
    1.3  CONVERSION OF SHARES.  At the Effective Time, by virtue of the Merger
and without any action on the part of any holder of any share of capital stock
of the Company or Merger Subsidiary:
 
        (a) Each share of common stock of the Company, par value $.01 per share
    ("Company Common Stock"), issued and outstanding immediately prior thereto
    (except for Dissenting Shares, as defined in Section 1.4 hereof, and except
    for shares referred to in Section 1.3(b) hereof) shall be converted into the
    right to receive the fraction of a share (subject to adjustment as provided
    below, the "Conversion Fraction") of common stock of Parent, par value $.10
    per share ("Parent Common Stock"), equal to
 
                                      B-5
<PAGE>
    $11.125 divided by the Parent Average Stock Price. The "Parent Average Stock
    Price" shall mean the average (rounded to the nearest full cent, with the
    cents rounded up if the third decimal place is 5 or more) of the daily
    closing sale prices of a share of Parent Common Stock as reported on the New
    York Stock Exchange ("NYSE") Composite Tape, as reported in The Wall Street
    Journal, for the 18 consecutive NYSE trading days ending on and including
    the second NYSE trading day immediately preceding the Effective Time.
 
        Notwithstanding the foregoing, if the sum of the number of shares of
    Company Common Stock outstanding immediately prior to the Effective Time
    plus the number of shares subject to then outstanding options, warrants, or
    other rights to acquire shares of Company Common Stock (collectively,
    "Company Stock Acquisition Rights") is greater than 8,879,725 shares plus
    that number of shares issuable pursuant to the current offering period in
    process as of the date of this Agreement under the Company's Employee Stock
    Purchase Plan or if the aggregate exercise price of all such Company Stock
    Acquisition Rights then outstanding is less than the aggregate exercise
    price reflected in Section 3.4 hereof, then the $11.125 amount per share of
    Company Common Stock, as described above, shall be reduced to an amount, if
    lower, equal to (i) $11.125 times [8,879,725 shares plus that number of
    shares issuable pursuant to the current offering period in process as of the
    date of this Agreement under the Company's Employee Stock Purchase Plan]
    minus the aggregate exercise price reflected in Section 3.4 hereof plus the
    aggregate amount received by the Company as a result of any issuance of
    Company Common Stock after the date of this Agreement and prior to the
    Effective Time plus the aggregate exercise price of all Company Stock
    Acquisition Rights outstanding immediately prior to the Effective Time
    divided by (ii) the sum of (A) the number of shares of Company Common Stock
    outstanding immediately prior to the Effective Time plus (B) the number of
    shares subject to Company Stock Acquisition Rights then outstanding.
 
        An appropriate adjustment shall similarly be made in the event that,
    prior to the Effective Time, the outstanding shares of Company Common Stock,
    without new consideration, are changed into or exchanged for a different
    kind of shares or securities through a reorganization, reclassification,
    stock dividend, stock combination, or other like change in the Company's
    capitalization. Notwithstanding the foregoing, nothing in this Section shall
    be deemed to constitute authorization or permission for or consent from
    Parent or Merger Subsidiary to any increase in the number of shares of
    Company Common Stock outstanding or subject to outstanding Company Stock
    Acquisition Rights, to any decrease in the exercise price of such Rights, or
    to any reorganization, reclassification, stock dividend, stock combination,
    or other like change in capitalization.
 
        (b) Each share of Company Common Stock issued and outstanding
    immediately prior to the Effective Time that is then owned beneficially or
    of record by Parent, Merger Subsidiary, or any direct or indirect subsidiary
    of Parent or the Company shall be cancelled without payment of any
    consideration therefor and without any conversion thereof.
 
        (c) Each share of any other class of capital stock of the Company (other
    than Company Common Stock) shall be cancelled without payment of any
    consideration therefor and without any conversion thereof.
 
        (d) Each share of common stock of Merger Subsidiary, par value $.01 per
    share ("Merger Subsidiary Common Stock"), issued and outstanding immediately
    prior to the Effective Time shall be converted into one share of the common
    stock of the Surviving Corporation, par value $.01 per share ("Surviving
    Corporation Common Stock").
 
    1.4  DISSENTING SHARES.  Notwithstanding any provision of this Agreement to
the contrary, each outstanding share of Company Common Stock, the holder of
which has demanded and perfected such holder's right to dissent from the Merger
and to be paid the fair value of such shares in accordance with Sections
302A.471 and 302A.473 of the MBCA and, as of the Effective Time, has not
effectively withdrawn or lost such dissenters' rights ("Dissenting Shares"),
shall not be converted into or represent a right to
 
                                      B-6
<PAGE>
receive the Parent Common Stock into which shares of Company Common Stock are
converted pursuant to Section 1.3 hereof, but the holder thereof shall be
entitled only to such rights as are granted by the MBCA. Parent shall cause the
Company to make all payments to holders of shares of Company Common Stock with
respect to such demands in accordance with the MBCA. The Company shall give
Parent (i) prompt written notice of any notice of intent to demand fair value
for any shares of Company Common Stock, withdrawals of such notices, and any
other instruments served pursuant to the MBCA and received by the Company, and
(ii) the opportunity to conduct jointly all negotiations and proceedings with
respect to demands for fair value for shares of Company Common Stock under the
MBCA. The Company shall not, except with the prior written consent of Parent or
as otherwise required by law, voluntarily make any payment with respect to any
demands for fair value for shares of Company Common Stock or offer to settle or
settle any such demands.
 
    1.5  EXCHANGE OF COMPANY COMMON STOCK.
 
        (a) Promptly after the Effective Time, Parent shall cause Parent's stock
    transfer agent or such other person as Parent may appoint to act as exchange
    agent (the "Exchange Agent") to mail to each holder of record (other than
    Parent, Merger Subsidiary, or any other subsidiary of Parent or the Company)
    of a certificate or certificates that immediately prior to the Effective
    Time represented outstanding shares of Company Common Stock ("Company
    Certificates") a form letter of transmittal (which shall specify that
    delivery shall be effective, and risk of loss and title to the Company
    Certificate(s) shall pass, only upon delivery of the Company Certificate(s)
    to the Exchange Agent) and instructions for such holder's use in effecting
    the surrender of the Company Certificates in exchange for certificates
    representing shares of Parent Common Stock.
 
        (b) As soon as practicable after the Effective Time, the Exchange Agent
    shall distribute to holders of shares of Company Common Stock, upon
    surrender to the Exchange Agent of one or more Company Certificates for
    cancellation, together with a duly-executed letter of transmittal, (i) one
    or more Parent certificates representing the number of whole shares of
    Parent Common Stock into which the shares represented by the Company
    Certificate(s) shall have been converted pursuant to Section 1.3(a), and
    (ii) a bank check in the amount of cash into which the shares represented by
    the Company Certificate(s) shall have been converted pursuant to Section
    1.5(f) (relating to fractional shares), and the Company Certificate(s) so
    surrendered shall be cancelled. In the event of a transfer of ownership of
    Company Common Stock that is not registered in the transfer records of the
    Company, it shall be a condition to the issuance of shares of Parent Common
    Stock that the Company Certificate(s) so surrendered shall be properly
    endorsed or be otherwise in proper form for transfer and that such
    transferee shall (i) pay to the Exchange Agent any transfer or other taxes
    required, or (ii) establish to the satisfaction of the Exchange Agent that
    such tax has been paid or is not payable.
 
        (c) Holders of Company Common Stock will be entitled to any dividends or
    other distributions pertaining to the Parent Common Stock received in
    exchange therefor that become payable to persons who are holders of record
    of Parent Common Stock as of a record date on the same date as or after the
    Effective Time, but only after they have surrendered their Company
    Certificates for exchange. Subject to the effect, if any, of applicable law,
    the Exchange Agent shall receive, hold, and remit any such dividends or
    other distributions to each such record holder entitled thereto, without
    interest, at the time that such Company Certificates are surrendered to the
    Exchange Agent for exchange. Holders of Company Common Stock will not be
    entitled, however, to dividends or other distributions that become payable
    before or after the Effective Time to persons who were holders of record of
    Parent Common Stock as of a record date that is prior to the Effective Time.
 
        (d) All shares of Parent Common Stock issued upon the surrender for
    exchange of Company Common Stock in accordance with the terms hereof
    (including any cash paid for fractional shares pursuant to Section 1.5(f)
    hereof) shall be deemed to have been issued in full satisfaction of all
    rights pertaining to such shares of Company Common Stock.
 
                                      B-7
<PAGE>
        (e) After the Effective Time, there shall be no further registration of
    transfers on the stock transfer books of the Surviving Corporation of the
    shares of Company Common Stock that were outstanding immediately prior to
    the Effective Time. If, after the Effective Time, Company Certificates
    representing such shares are presented to the Surviving Corporation, they
    shall be cancelled and exchanged as provided in this Article 1. As of the
    Effective Time, the holders of Company Certificates representing shares of
    Company Common Stock shall cease to have any rights as shareholders of the
    Company, except such rights, if any, as they may have pursuant to the MBCA.
    Except as provided above, until such Company Certificates are surrendered
    for exchange, each such Company Certificate shall, after the Effective Time,
    represent for all purposes only the right to receive the number of whole
    shares of Parent Common Stock into which the shares of Company Common Stock
    shall have been converted pursuant to the Merger as provided in Section
    1.3(a) hereof and the right to receive the cash value of any fraction of a
    share of Parent Common Stock as provided in Section 1.5(f) hereof.
 
        (f) No fractional shares of Parent Common Stock and no certificates or
    scrip therefor, or other evidence of ownership thereof, shall be issued upon
    the surrender for exchange of Company Certificates, no dividend or other
    distribution of Parent shall relate to any fractional share, and such
    fractional share interests shall not entitle the owner thereof to vote or to
    any rights of a shareholder of Parent. All fractional shares of Parent
    Common Stock to which a holder of Company Common Stock immediately prior to
    the Effective Time would otherwise be entitled, at the Effective Time, shall
    be aggregated if and to the extent multiple Company Certificates of such
    holder are submitted together to the Exchange Agent. If a fractional share
    results from such aggregation, then (in lieu of such fractional share) the
    Exchange Agent shall pay to each holder of shares of Company Common Stock
    who otherwise would be entitled to receive such fractional share of Parent
    Common Stock an amount of cash (without interest) determined by multiplying
    (i) the Parent Average Stock Price by (ii) the fractional share of Parent
    Common Stock to which such holder would otherwise be entitled. Parent will
    make available to the Exchange Agent any cash necessary for this purpose.
 
        (g) In the event any Company Certificates shall have been lost, stolen,
    or destroyed, the Exchange Agent shall issue in exchange for such lost,
    stolen, or destroyed Company Certificates, upon the making of an affidavit
    of that fact by the holder thereof, such shares of Parent Common Stock and
    cash for fractional shares, if any, as may be required pursuant to this
    Article 1; provided, however, that Parent may, in its discretion and as a
    condition precedent to the issuance thereof, require the owner of such lost,
    stolen, or destroyed Company Certificate to deliver a bond in such sum as
    Parent may direct as indemnity against any claim that may be made against
    Parent or the Exchange Agent with respect to such Company Certificate
    alleged to have been lost, stolen, or destroyed.
 
        (h) Each person entitled to receive shares of Parent Common Stock
    pursuant to this Article 1 shall receive together with such shares the
    number of Parent preferred share purchase rights (pursuant to the Rights
    Agreement dated as of June 27, 1991, between Parent and Norwest Bank
    Minnesota, N.A., the "Parent Rights Plan") per share of Parent Common Stock
    equal to the number of Parent preferred share purchase rights associated
    with one share of Parent Common Stock at the Effective Time.
 
    1.6  EXCHANGE OF MERGER SUBSIDIARY COMMON STOCK.  From and after the
Effective Time, each outstanding certificate previously representing shares of
Merger Subsidiary Common Stock shall be deemed for all purposes to evidence
ownership of and to represent the number of shares of Surviving Corporation
Common Stock into which such shares of Merger Subsidiary Common Stock shall have
been converted. Promptly after the Effective Time, the Surviving Corporation
shall issue to Parent a stock certificate or certificates representing such
shares of Surviving Corporation Common Stock in exchange for the certificate or
certificates that formerly represented shares of Merger Subsidiary Common Stock,
which shall be cancelled.
 
                                      B-8
<PAGE>
    1.7  STOCK OPTIONS.
 
        (a) Except as provided below with respect to the Company's Employee
    Stock Purchase Plan, each option to purchase shares of Company Common Stock
    that is outstanding at the Effective Time (a "Company Option") shall, by
    virtue of the Merger and without any action on the part of the holder
    thereof, be assumed by Parent (and a registration statement on Form S-8
    therefor shall be filed promptly after the Effective Time) in such manner
    that Parent (i) is a corporation "assuming a stock option in a transaction
    to which Section 424(a) applies" within the meaning of Section 424 of the
    Code and the regulations thereunder or (ii) to the extent that Section 424
    of the Code does not apply to any such Company Option, would be such a
    corporation were Section 424 of the Code applicable to such Company Option.
    From and after the Effective Time, all references to the Company in the
    Company Options shall be deemed to refer to Parent (other than for purposes
    of determining whether there has been a change in control of the Company).
    The Company Options assumed by Parent shall be exercisable upon the same
    terms and conditions as under the Company Options (including provisions
    thereof, if any, relating to the acceleration of vesting upon a change in
    control of the Company) except that (i) such Company Options shall entitle
    the holder to purchase from Parent the number of shares of Parent Common
    Stock (rounded to the nearest whole number of such shares) that equals the
    product of the Conversion Fraction multiplied by the number of shares of
    Company Common Stock subject to such option immediately prior to the
    Effective Time, and (ii) the option exercise price per share of Parent
    Common Stock shall be an amount (rounded to the nearest full cent) equal to
    the option exercise price per share of Company Common Stock in effect
    immediately prior to the Effective Time divided by the Conversion Fraction;
    provided, however, that in the case of any Company Option to which Section
    421 of the Code applies by reason of its qualification under Section 422 of
    the Code ("incentive stock options"), the option price, the number of shares
    purchasable pursuant to such option and the terms and conditions of exercise
    of such options shall be determined in order to comply with Section 424(a)
    of the Code. As promptly as practicable after the Effective Time, Parent
    shall issue to each holder of a Company Option a written instrument
    informing such holder of the assumption by Parent of such Company Option.
 
        (b) The current offering period in process as of the date of this
    Agreement under the Company's Employee Stock Purchase Plan shall continue
    and shares shall be issued to participants thereunder as provided under, and
    subject to the terms and conditions of, such Plan; provided, however, that
    if the Effective Time occurs prior to the originally scheduled expiration of
    such current offering period on September 30, 1998, then immediately prior
    to the Effective Time, such current offering period under the Company's
    Employee Stock Purchase Plan shall be ended, and each participant shall be
    deemed to have purchased immediately prior to the Effective Time, to the
    extent of payroll deductions accumulated by such participant as of such
    offering period end, the number of whole shares of Company Common Stock at a
    per share price determined pursuant to the provisions of the Company's
    Employee Stock Purchase Plan, and each participant shall receive a cash
    payment equal to the balance, if any, of such accumulated payroll deductions
    remaining after such purchase of such shares. As of the Effective Time, all
    such shares shall be converted in the manner provided in Section 1.3. No
    offering periods under the Company's Employee Stock Purchase Plan that are
    subsequent to the current offering period in process as of the date of this
    Agreement shall be commenced, and the Company's Employee Stock Purchase Plan
    and all purchase rights thereunder shall terminate effective as of the
    Effective Time.
 
    1.8  CAPITALIZATION CHANGES.  If, between the date of this Agreement and the
Effective Time, the outstanding shares of Parent Common Stock shall have been
changed into a different number of shares or a different class by reason of any
reclassification, recapitalization, split-up, combination, exchange of shares,
or stock dividend, the Conversion Fraction and all per-share price amounts and
calculations set forth in this Agreement shall be appropriately adjusted.
 
                                      B-9
<PAGE>
    1.9  ARTICLES OF INCORPORATION OF THE SURVIVING CORPORATION.  The Articles
of Incorporation of Merger Subsidiary, as in effect immediately prior to the
Effective Time, shall be the Articles of Incorporation of the Surviving
Corporation until thereafter amended in accordance with applicable law;
provided, however, that upon the Effective Time, Article 1 of the Articles of
Incorporation of the Surviving Corporation shall be amended to read in its
entirety as follows: "The name of the corporation shall be Medtronic AVECOR
Cardiovascular, Inc."
 
    1.10  BYLAWS OF THE SURVIVING CORPORATION.  The Bylaws of Merger Subsidiary,
as in effect immediately prior to the Effective Time, shall be the Bylaws of the
Surviving Corporation until thereafter amended in accordance with applicable
law.
 
    1.11  DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION.  The directors
and officers of Merger Subsidiary immediately prior to the Effective Time shall
be the directors and officers, respectively, of the Surviving Corporation until
their respective successors shall be duly elected and qualified.
 
                                   ARTICLE 2
                                    CLOSING
 
    2.1  TIME AND PLACE.  Subject to the satisfaction or waiver of the
provisions of Article 6, the closing of the Merger (the "Closing") shall take
place at 10:00 a.m., local time, on the day the Merger is approved by the
shareholders of the Company at the Company Shareholders Meeting (as defined in
Section 5.4 hereof), or as soon thereafter as all conditions to Closing have
been satisfied or waived, or on such other date and/or at such other time as
Parent and the Company may mutually agree. The date on which the Closing
actually occurs is herein referred to as the "Closing Date." The Closing shall
take place at the corporate headquarters offices of Parent, or at such other
place or in such other manner (E.G., by telecopy exchange of signature pages
with originals to follow by overnight delivery) as the parties hereto may agree.
 
    2.2  FILINGS AT THE CLOSING.  At the Closing, subject to the provisions of
Article 6, Parent, Merger Subsidiary, and the Company shall cause Articles of
Merger to be filed in accordance with the provisions of Section 302A.615 of the
MBCA, and take any and all other lawful actions and do any and all other lawful
things necessary to cause the Merger to become effective.
 
                                   ARTICLE 3
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    The Company represents and warrants to Parent and Merger Subsidiary as of
the date hereof as follows:
 
   
    3.1  DISCLOSURE SCHEDULE.  As of the date hereof, the Company has not
completed its internal investigation and review for purposes of confirming and
verifying the representations and warranties of the Company contained in this
Agreement. On or prior to the close of business on the tenth business day after
the date hereof, the Company shall deliver to Parent a disclosure schedule ( the
"Disclosure Schedule") with each disclosure therein set forth in the Section or
subsection which corresponds by number for purposes of exceptions to a
representation or warranty to the applicable Section or subsection of this
Article 3. In the event that Parent determines that the Disclosure Schedule
contains information which in Parent's good faith, reasonable business judgment
adversely affects the value of the Company's business or prospects, then Parent
shall have the right, within 10 business days of the receipt of the full and
complete Disclosure Schedule, to terminate this Agreement as set forth in
Section 7.1(i) hereto.
    
 
    3.2  ORGANIZATION.  The Company and each subsidiary of the Company (referred
to herein as a "Subsidiary") is a corporation duly organized, validly existing,
and in good standing under the laws of its respective jurisdiction of
incorporation and has all requisite corporate power and authority to own, lease,
and operate its properties and to carry on its business as now being conducted.
The Company and each Subsidiary is duly qualified and in good standing to do
business in each jurisdiction in which the property
 
                                      B-10
<PAGE>
owned, leased, or operated by it or the nature of the business conducted by it
makes such qualification necessary and where the failure to qualify could
reasonably be expected to have a Company Material Adverse Effect (as defined
below). "Company Material Adverse Effect" means any effect, change or event
that, individually or in the aggregate with all similar effects, changes or
events, is or would reasonably be expected to be material and adverse: (i)
either before or immediately after the Effective Time, to the business,
properties, liabilities, results of operation, or financial condition of the
Company and its Subsidiaries, considered as a whole; or (ii) to the Company's
ability to perform any of its obligations under this Agreement or to consummate
the Merger; provided, however, that Company Material Adverse Effect shall not be
deemed to include the impact of actions or omissions of the Company taken with
the prior written consent of Parent in contemplation of the transactions
contemplated hereby, or the effects of the Merger (or any announcement with
respect thereto) and compliance with the provisions of this Agreement on the
operating performance or prospects of the Company and its subsidiaries,
including without limitation, any such loss of customer or distributor
relationships or employees following the announcement of the Merger. The
jurisdictions in which the Company and each Subsidiary are qualified are listed
on the Disclosure Schedule. The Company has heretofore delivered to Parent
complete and accurate copies of the Articles of Incorporation and Bylaws of the
Company and each Subsidiary, as currently in effect. Except to the extent
specifically disclosed on the Disclosure Schedule, or any entity in which the
Company owns, directly or indirectly, an equity interest of less than 1% of the
fair market value of such entity's outstanding equity securities, neither the
Company nor any Subsidiary, directly or indirectly, owns or controls or has any
capital, equity, partnership, participation, or other ownership interest in any
corporation, partnership, joint venture, or other business association or
entity.
 
    3.3  AUTHORIZATION.  The Company has the requisite corporate power and
authority to execute and deliver this Agreement and, subject to obtaining the
necessary approval of its shareholders, the requisite corporate power and
authority to consummate the transactions contemplated hereby, and to file and
distribute the Proxy Statement/Prospectus (as defined in Section 5.4 hereof).
The execution and delivery of this Agreement by the Company and the consummation
of the transactions contemplated hereby have been duly and validly authorized
and approved by the Company's Board of Directors and, in accordance with Section
302A.673 of the MBCA, by the required committee of such Board of Directors, no
other corporate proceedings on the part of the Company or any Subsidiary are
necessary to authorize this Agreement, and, subject to obtaining the approval of
the Company's shareholders, no other corporate action on the part of the Company
or any Subsidiary is necessary to consummate the transactions contemplated
hereby. This Agreement has been duly and validly executed and delivered by the
Company and constitutes the valid and binding obligation of the Company,
enforceable against the Company in accordance with its terms, subject to laws of
general application relating to bankruptcy, insolvency, reorganization,
moratorium or other similar laws affecting creditors' rights generally and rules
of law governing specific performance, injunctive relief, or other equitable
remedies. To the Company's knowledge, each Agreement to Facilitate Merger and
Affiliate's Letter (as described in Sections 5.11 and 5.6) has been duly and
validly executed and delivered by the Company shareholder who is a party thereto
and constitutes the valid and binding obligation of such shareholder,
enforceable in accordance with its terms, subject to laws of general application
relating to bankruptcy, insolvency, reorganization, moratorium or other similar
laws affecting creditors' rights generally and rules of law governing specific
performance, injunctive relief, or other equitable remedies.
 
    3.4  CAPITALIZATION.  The authorized capital stock of the Company consists
of (i) 20,000,000 shares of Company Common Stock, par value $.01 per share, of
which 8,044,475 shares are issued and outstanding, and (ii) 2,000,000 shares of
Company Preferred Stock, par value $.01 per share, including 200,000 shares of
Series A Junior Preferred Stock, none of which are issued or outstanding. Except
as set forth on the Disclosure Schedule, all issued and outstanding shares of
capital stock of each Subsidiary are owned, beneficially and of record, by the
Company, free and clear of any Liens (as defined in Section 3.15). All issued
and outstanding shares of Company Common Stock have been validly issued, are
fully paid and nonassessable, and have not been issued in violation of and are
not currently subject to any preemptive
 
                                      B-11
<PAGE>
rights. Except as set forth on the Disclosure Schedule and except for options to
purchase an aggregate 832,250 shares of Company Common Stock at an aggregate
exercise price of $8,005,782 granted pursuant to the Company's 1991 Stock
Incentive Plan and 1995 Non-Employee Director Option Plan (collectively, the
"Company Option Plans") listed, together with their respective exercise prices,
on the Disclosure Schedule, and except for the rights to purchase under the
Company's Employee Stock Purchase Plan shares of Company Common Stock (estimated
to be approximately 10,000 shares, at a per share price of $7.44, based on the
current contribution rates of the participants, as listed on the Disclosure
Schedule, and assuming the current Plan offering period in process as of the
date of this Agreement is ended on September 30, 1998 for this purpose), there
are not any outstanding or authorized subscriptions, options, warrants, calls,
rights, convertible securities, commitments, restrictions, arrangements, or any
other agreements of any character to which the Company or any Subsidiary is a
party that, directly or indirectly, (i) obligate the Company or any Subsidiary
to issue any shares of capital stock or any securities convertible into, or
exercisable or exchangeable for, or evidencing the right to subscribe for, any
shares of capital stock, (ii) call for or relate to the sale, pledge, transfer,
or other disposition or encumbrance by the Company or any Subsidiary of any
shares of its capital stock, or (iii) to the knowledge of the Company, relate to
the voting or control of such capital stock. The Disclosure Schedule sets forth
a complete and accurate list of all stock options, warrants, and other rights to
acquire Company Common Stock, including the name of the holder, the date of
grant, acquisition price, expiration date, number of shares, exercisability
schedule, and, in the case of options, the type of option under the Code. The
Disclosure Schedule also sets forth the contractual restrictions to which any
shares of Company Common Stock issued pursuant to the Company Option Plans or
otherwise are currently subject and also sets forth the restrictions to which
such shares will be subject immediately after the Effective Time, other than as
set forth in the Company Option Plans or stock option agreements thereunder. No
consent of holders or participants under the Company Option Plans or Employee
Stock Purchase Plan is required to carry out the provisions of Section 1.7. All
actions, if any, required on the part of the Company under the Company Option
Plans or Employee Stock Purchase Plan to allow for the treatment of Company
Options and the Employee Stock Purchase Plan as is provided in Section 1.7, has
been, or prior to the Closing will be, validly taken by the Company, and the
Company will not from and after the date hereof allow any increase in the rate
of a participant's contributions to the Employee Stock Purchase Plan, any new
enrollments or re-enrollments in the current offering period in process as of
the date of this Agreement under such Plan or the commencement of any offering
periods under such Plan subsequent to the current offering period in process as
of the date of this Agreement.
 
    3.5  REPORTS AND FINANCIAL STATEMENTS.  The Company has filed all forms,
reports, registration statements, and documents required to be filed by it with
the Securities and Exchange Commission ("SEC") since January 1, 1995 (such
forms, reports, registration statements, and documents, together with any
amendments thereto, are referred to as the "Company SEC Filings"). As of their
respective dates, the Company SEC Filings (i) complied as to form in all
material respects with the applicable requirements of the Securities Act of 1933
and the rules and regulations thereunder (the "1933 Act") and the Securities
Exchange Act of 1934 and the rules and regulations thereunder (the "1934 Act"),
as the case may be, and (ii) did not contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements made therein, in light of the circumstances under which
they were made, not misleading. The audited financial statements and unaudited
interim financial statements included or incorporated by reference in the
Company SEC Filings, including but not limited to the Company's audited
financial statements at and for the year ended December 31, 1997 (the "Company
1997 Financials"), (i) were prepared in accordance with generally accepted
accounting principles applied on a consistent basis during the periods involved
(except as may be indicated therein or in the notes thereto), subject, in the
case of unaudited interim financial statements, to the absence of notes and to
year-end adjustments, (ii) complied as of their respective dates in all material
respects with applicable accounting requirements and the published rules and
regulations of the SEC with respect thereto, and (iii) fairly presented the
consolidated financial position of the Company as of the dates thereof and the
 
                                      B-12
<PAGE>
income, cash flows, and changes in shareholders' equity for the periods
involved. The statements of earnings included in the audited or unaudited
interim financial statements in the Company SEC Filings do not contain any items
of special or nonrecurring income or any other income not earned in the ordinary
course of business, except as expressly specified in the applicable statement of
operations or notes thereto. Prior to the date hereof, the Company has delivered
to Parent complete and accurate copies of all Company SEC Filings since January
1, 1995. The Company has also delivered to Parent complete and accurate copies
of all statements on Schedule 13D and Schedule 13G known to the Company to have
been filed with the SEC since January 1, 1997, with respect to capital stock of
the Company. Since January 1, 1997, the Company has filed in a timely manner all
reports required to be filed by it pursuant to Sections 13, 14, or 15(d) of the
1934 Act.
 
    3.6  ABSENCE OF UNDISCLOSED LIABILITIES.  Except to the extent specifically
disclosed on the Disclosure Schedule, neither the Company nor any Subsidiary has
any liabilities or obligations of any nature (whether absolute, accrued,
contingent, or otherwise) which would have a Company Material Adverse Effect
except (a) liabilities or obligations that are accrued or reserved against in
the audited consolidated balance sheet of the Company as of December 31, 1997
contained in the Company 1997 Financials (the "Company Audited Balance Sheet")
or in the unaudited consolidated balance sheet of the Company as of March 31,
1998 contained in the Company's Quarterly Report on Form 10-Q for the fiscal
quarter ended March 31, 1998 (the "Company Interim Balance Sheet"), and (b)
liabilities or obligations disclosed in this Agreement.
 
    3.7  CONSENTS AND APPROVALS.  Except for (i) any applicable requirements of
the 1933 Act, the 1934 Act, state securities laws, the Hart-Scott-Rodino
Antitrust Improvements Act of 1976 and the regulations thereunder (the "HSR
Act"), and the antitrust, competition, foreign investment, or similar laws of
any foreign countries or supranational commissions or boards that require
pre-merger notifications or filings with respect to the Merger (collectively,
"Foreign Merger Laws"), (ii) approval by the Company's shareholders, (iii) the
filing and recordation of appropriate merger documents as required by the MBCA,
(iv) compliance with Sections 302A.471 and 302A.473 of the MBCA regarding
dissenters' rights, or (v) any items disclosed on the Disclosure Schedule, the
execution and delivery of this Agreement and the Stock Option Agreement by the
Company, and, to the Company's knowledge, the execution and delivery of the
Agreements to Facilitate Merger, and the consummation of the transactions
contemplated hereby and thereby will not: (a) violate any provision of the
Articles of Incorporation or Bylaws of the Company or any Subsidiary; (b)
violate any statute, rule, regulation, order, or decree of any federal, state,
local, or foreign body or authority (including, but not limited to, the Food and
Drug Administration (the "FDA") or any nongovernmental self-regulatory agency)
by which the Company or any Subsidiary or any of their respective properties or
assets may be bound; (c) require any filing with or permit, consent, or approval
of any federal, state, local, or foreign public body or authority (including,
but not limited to, the FDA or any nongovernmental self-regulatory agency); or
(d) result in any violation or breach of, or constitute (with or without due
notice or lapse of time or both) a default under, result in the loss of any
material benefit under, or give rise to any right of termination, cancellation,
increased payments, or acceleration under, or result in the creation of any Lien
(as defined in Section 3.15) on any of the properties or assets of the Company
or any Subsidiary under, any of the terms, conditions, or provisions of any
note, bond, mortgage, indenture, license, franchise, permit, authorization,
agreement, or other instrument or obligation to which the Company or any
Subsidiary is a party, or by which it or any of its properties or assets may be
bound, except, (x) in the cases of clauses (b) or (c), where such violation,
failure to make any such filing or failure to obtain such permit, consent or
approval, would not prevent or delay consummation of this Merger or otherwise
prevent the Company from performing its obligations under this Agreement and
would not have a Company Material Adverse Effect, and (y) in the case of clause
(d), for any such violations, breaches, defaults, or other occurrences that
would not prevent or delay consummation of any of the transactions contemplated
hereby in any material respect, or otherwise prevent the Company from performing
its obligations under this Agreement in any material respect, and would not have
a Company Material Adverse Effect.
 
                                      B-13
<PAGE>
    3.8  COMPLIANCE WITH LAWS.  Except to the extent specifically disclosed on
the Disclosure Schedule, all activities of the Company and each Subsidiary have
been, and are currently being, conducted in compliance with all applicable
federal, state, local, and foreign laws, ordinances, regulations,
interpretations, judgments, decrees, injunctions, permits, licenses,
certificates, governmental requirements (including, but not limited to FDA Good
Manufacturing Practices), orders, and other similar items of any court or other
governmental entity (including, but not limited to, those of the FDA or any
nongovernmental self-regulatory agency), the failure to comply with which could
reasonably be expected to have a Company Material Adverse Effect. The Company
and each Subsidiary has timely filed or otherwise provided all registrations,
reports, data, and other information and applications with respect to its
medical device, pharmaceutical, consumer, health care, and other governmentally
regulated products (the "Regulated Products") required to be filed with or
otherwise provided to the FDA or any other federal, state, local, or foreign
governmental authorities with jurisdiction over the manufacture, use, or sale of
the Regulated Products, and all regulatory licenses or approvals in respect
thereof are in full force and effect, except where the failure to file timely
such registrations, reports, data, information, and applications or the failure
to have such licenses and approvals in full force and effect would not have a
Company Material Adverse Effect.
 
    3.9  LITIGATION.  Except to the extent specifically disclosed on the
Disclosure Schedule, to the Company's knowledge, no investigation or review by
any federal, state, local, or foreign body or authority (including, but not
limited to, the FDA or any nongovernmental self-regulatory agency) with respect
to the Company or any Subsidiary is pending or threatened, nor has any such body
or authority (including, but not limited to, the FDA or any nongovernmental
self-regulatory agency) indicated to the Company or any Subsidiary an intention
to conduct the same. Except to the extent specifically disclosed on the
Disclosure Schedule, there are no claims, actions, suits, or proceedings by any
private party that could reasonably be expected to involve individually an
amount in excess of $50,000 or collectively an aggregate amount in excess of
$200,000, or by any governmental body or authority (including, but not limited
to, the FDA or any nongovernmental self-regulatory agency), against or affecting
the Company or any Subsidiary, pending or, to the knowledge of the Company,
threatened at law or in equity, or before any federal, state, local, foreign, or
other governmental department, commission, board, bureau, agency, or
instrumentality (including, but not limited to, the FDA or any nongovernmental
self-regulatory agency).
 
    3.10  ABSENCE OF MATERIAL ADVERSE CHANGES.  Except to the extent
specifically disclosed in the Disclosure Schedule, since December 31, 1997 there
has not been any (a) change or circumstance that could reasonably be expected to
have a Company Material Adverse Effect; (b) action by the Company or any
Subsidiary that, if taken on or after the date of this Agreement, would require
the consent or approval of Parent pursuant to Section 5.1 hereof, except for
actions as to which consent or approval has been given as provided therein or
actions prior to March 31, 1998; (c) damage, destruction, or loss, whether or
not covered by insurance, that could reasonably be expected to have a Company
Material Adverse Effect; (d) change by the Company or any Subsidiary in
accounting methods or principles used for financial reporting purposes, except
as required by a change in generally accepted accounting principles and
concurred with by the Company's independent public accountants; or (e)
agreement, whether in writing or otherwise, to take any action described or
referenced in this Section 3.10.
 
    3.11  ENVIRONMENTAL LAWS AND REGULATIONS.  The Disclosure Schedule
completely and accurately sets forth the following: (a) a list of all
above-ground storage tanks or underground storage tanks for Hazardous Materials
(as defined below) on real property now or at any time in the past owned,
leased, or occupied by the Company or any Subsidiary (such real property
referred to in this Section as the "Real Property"); (b) the identity of any
Hazardous Materials (as defined below) used, generated, transported or disposed
of by the Company or any Subsidiary now or at any time in the past, together
with a brief description and location of each activity using such Hazardous
Materials; (c) a summary of the identity of, to the Company's knowledge, any
Hazardous Materials that have been disposed of or found on, above or below any
Real Property; and (d) a list of all reports, studies, and tests in the
possession of the Company or
 
                                      B-14
<PAGE>
any Subsidiary or initiated by the Company or any Subsidiary pertaining to the
existence of Hazardous Materials on, above, or below any Real Property or any
property adjoining or which could reasonably be expected to affect the Real
Property, or concerning compliance with or liability under the Regulations (as
defined below). The Company has heretofore delivered to Parent complete and
accurate copies of such reports, studies, and tests.
 
    The Company and each Subsidiary have obtained, and maintained in full force
and effect, all required environmental permits and other governmental approvals
and are in compliance with all applicable Regulations (as defined below), except
where the failure to so obtain and maintain or to be in compliance would not
have a Company Material Adverse Effect. Neither the Company nor any Subsidiary
(i) has received a written notice or Claim (as defined below) alleging potential
liability under any of the Regulations or alleging a violation of the
Regulations or (ii) has any knowledge that such a notice or Claim may be issued
in the future. Neither the Company nor any Subsidiary has any knowledge of any
notices to or Claims against any persons, alleging potential liability under any
of the Regulations with respect to the Real Property or any adjoining properties
or which could reasonably be expected to affect the Real Property. Neither the
Company nor any Subsidiary (i) has been or is presently subject to or, to the
knowledge of the Company, threatened with any administrative or judicial
proceeding pursuant to the Regulations, or (ii) has any information that it may
be subject to or, to the knowledge of the Company, threatened with such a
proceeding in the future. Neither the Company nor any Subsidiary has knowledge
of any conditions or circumstances that could reasonably be expected to result
in the determination of liability against the Company or any Subsidiary relating
to environmental matters that would have a Company Material Adverse Effect,
including, but not limited to, any Claim arising from past or present
environmental practices with respect to Hazardous Materials, the Real Property,
or any disposal sites. To the knowledge of the Company, and except as allowed
under applicable Laws or Regulations, no Hazardous Materials have been or are
threatened to be discharged, emitted, or released into the air, water, soil, or
subsurface at or from the Real Property by the Company.
 
    For purposes of this Section 3.11, the following terms shall have the
following meanings: (i) "Hazardous Materials" means asbestos, urea formaldehyde,
polychlorinated biphenyls, nuclear fuel or materials, chemical waste,
radioactive materials, explosives, known human carcinogens, petroleum products
or other substances or materials listed, identified, or designated as toxic or
hazardous or as a pollutant or contaminant in, or the use, release or disposal
of which is regulated by, the Regulations; (ii) "Regulations" means the
Comprehensive Environmental Response Compensation and Liability Act ("CERCLA")
as amended by the Superfund Amendments and Reauthorization Act of 1986 ("SARA"),
42 U.S.C. Section Section 9601 ET SEQ.; the Federal Resource Conservation and
Recovery Act of 1976 ("RCRA"), 42 U.S.C. Section Section 6901 ET SEQ.; the Clean
Water Act, 33 U.S.C. Section Section 1321 ET SEQ.; the Clean Air Act, 42 U.S.C.
Section Section 7401 ET SEQ., and any other federal, state, county, local,
foreign, or other governmental statute, regulation, or ordinance, as adopted and
in effect as of the date hereof, that relates to or deals with employee safety
and human health, pollution, health, or the environment including, but not
limited to, the use, generation, discharge, transportation, disposal,
recordkeeping, notification, and reporting of Hazardous Materials; and (iii)
"Claim" means any and all claims, demands, causes of actions, suits,
proceedings, administrative proceedings, losses, judgments, decrees, debts,
damages, liabilities, court costs, penalties, attorneys' fees, and any other
expenses incurred, assessed, sustained or alleged by or against the Company or
any Subsidiary.
 
    3.12  OFFICERS, DIRECTORS AND EMPLOYEES.  Prior to the date hereof, the
Company has provided to Parent a list that completely and accurately sets forth
the name and current annual salary rate of each officer or exempt employee of
the Company or any Subsidiary whose total remuneration for the last fiscal year
was, or for the current fiscal year has been set at, in excess of $50,000,
together with a summary of the bonuses, commissions and additional compensation,
if any, paid or payable to such persons for the last fiscal year and proposed
for the current fiscal year. The Disclosure Schedule completely and accurately
sets forth (i) the names of all former employees whose employment with the
Company or any Subsidiary
 
                                      B-15
<PAGE>
has terminated either voluntarily or involuntarily during the preceding 12-month
period; and (ii) the names of the officers (with all positions and titles
indicated) and directors of the Company and each Subsidiary. No unfair labor
practice complaint against the Company or any Subsidiary is pending before the
National Labor Relations Board, and there is no labor strike, slowdown or
stoppage pending or, to the knowledge of the Company, threatened against or
involving the Company or any Subsidiary. Since January 1, 1995, no unionizing
efforts have, to the knowledge of the Company, been made by employees of the
Company or any Subsidiary, neither the Company nor any Subsidiary is a party to
or subject to any collective bargaining agreement, and no collective bargaining
agreement is currently being negotiated by the Company or any Subsidiary. There
is no material labor dispute pending or, to the knowledge of the Company,
threatened between the Company or any Subsidiary and its employees.
 
    3.13  TAXES.  The Company has previously furnished to Parent complete and
accurate copies of all tax or assessment reports and tax returns (including any
applicable information returns) required by any law or regulation (whether
United States, foreign, state, local, or other jurisdiction) and filed by the
Company for each of the three fiscal years ended December 31, 1995, 1996, and
1997 and of all such returns filed separately by any Subsidiary for fiscal years
ended during or after 1995. The Company and each Subsidiary has filed, or has
obtained extensions to file (which extensions have not expired without filing),
all state, local, United States, foreign, or other tax reports and returns
required to be filed by any of them. The Company and each Subsidiary has duly
paid, or accrued on its books of account, all taxes (including estimated taxes)
shown as due on such reports and returns (or such extension requests), or
assessed against it, or that it is obligated to withhold from amounts owed by it
to any person. The liabilities and reserves for taxes reflected on the Company
Audited Balance Sheet or the Company Interim Balance Sheet are adequate to cover
all taxes payable by the Company and its Subsidiaries for all taxable periods
and portions thereof ending on or before the dates thereof. There are no Liens
(as defined in Section 3.14) for taxes upon any property or asset of the Company
or any Subsidiary. Neither the Company nor any Subsidiary is delinquent in the
payment of any tax assessment (including, but not limited to, any applicable
withholding taxes). None of the tax returns or reports for the tax periods ended
December 31, 1995, 1996, and 1997 have been audited by the Internal Revenue
Service (the "IRS") or by any other taxing authority. Further, to the knowledge
of the Company, except as set forth in the Disclosure Schedule, no state of
facts exists or has existed that could reasonably be expected to subject the
Company or any Subsidiary to an additional tax liability for any taxes
assessable by either the IRS or any separate state, local, foreign, or other
taxing authority with respect to any reports or returns filed on or before the
date hereof (other than extension requests for which returns have not been filed
as of the date hereof) that would have a Company Material Adverse Effect.
Neither the Company nor any Subsidiary has, with regard to any assets or
property held, acquired or to be acquired by any of them, filed a consent to the
application of Section 341(f)(2) of the Code. Except to the extent specifically
disclosed on the Disclosure Schedule, neither the Company nor any Subsidiary has
(i) received notification of any pending or proposed examination by either the
IRS or any state, local, foreign, or other taxing authority, (ii) received
notification of any pending or proposed deficiency by either the IRS or any
state, local, foreign, or other taxing authority, or (iii) granted any extension
of the limitations period applicable to any claim for taxes.
 
    For the purposes of this Section 3.12, "tax" shall mean and include taxes,
additions to tax, penalties, interest, fines, duties, withholdings, assessments,
and charges assessed or imposed by any governmental authority, including but not
limited to all federal, state, county, local, and foreign income, profits, gross
receipts, import, ad valorem, real and personal property, franchise, license,
sales, use, value added, stamp, transfer, withholding, payroll, employment,
excise, custom, duty, and any other taxes, obligations and assessments of any
kind whatsoever; "tax" shall also include any liability arising as a result of
being (or ceasing to be) a member of any affiliated, consolidated, combined, or
unitary group as well as any liability under any tax allocation, tax sharing,
tax indemnity, or similar agreement.
 
    3.14  CONTRACTS.  Except as set forth on the Disclosure Schedule, neither
the Company nor any Subsidiary (i) is a party to any collective bargaining
agreement or contract with any labor union, (ii) is a
 
                                      B-16
<PAGE>
party to any written or oral contract for the employment of any officer,
individual employee or other person on a full-time or consulting basis, or
relating to severance pay for any such person, (iii) is a party to any (A)
written or oral agreement or understanding to repurchase assets previously sold
(or to indemnify or otherwise compensate the purchaser in respect of such
assets) or (B) agreement for the sale of any capital asset, (iv) is a party to
any contract, arrangement, commitment or understanding (whether written or oral)
which provides for future payments by the Company in excess of $50,000 and is
not terminable by the Company nor any Subsidiary within 60 days without payment
of a penalty or premium, other than employment contracts, benefit plans and
leases otherwise disclosed in the Disclosure Schedule or listed as an exhibit in
the Company SEC Filings, (v) is a party to any independent sales representative,
OEM, supply, distribution, manufacturers' representative, dealer, licensing
(except for immaterial licenses, which include without limitation, licenses for
off-the-shelf software) joint development, joint venture, research and
development, or similar contract, (vi) is a party to any contract, arrangement,
commitment or understanding which is a material contract (as defined in Item
601(b)(10) of Regulation S-K of the SEC) to be performed after the date of this
Agreement that has not been filed or incorporated by reference in the Company
SEC Filings, (vii) is a party to any confidentiality agreement or any agreement
which prohibits the Company or the Subsidiary from freely engaging in any
business anywhere in the world, (viii) is a party to any agreement or indenture
relating to the borrowing of money, (ix) has guaranteed any obligation for
borrowed money, or (x) is a party to any agreement or contract that obligates
the Company to pay consequential damages. The Company and each Subsidiary has
performed all obligations required to be performed by it under any listed or
material contract, plan, agreement, understanding, or arrangement made or
obligation owed by or to the Company or any Subsidiary, except where the failure
would not have a Company Material Adverse Effect; there has not been any event
of default (or any event or condition which with notice or the lapse of time,
both or otherwise, would constitute an event of default) thereunder on the part
of the Company, any Subsidiary, or, to the Company's knowledge, any other party
to any thereof that would have a Company Material Adverse Effect; the same are
in full force and effect and valid and enforceable by the Company or its
Subsidiaries in accordance with their respective terms subject to laws of
general application relating to bankruptcy, insolvency, reorganization,
moratorium or other similar laws affecting creditors' rights generally and rules
or law governing specific performance, injunctive relief, and other equitable
remedies; and the performance of any such contracts, plans, agreements,
understandings, arrangements, or obligations would not have a Company Material
Adverse Effect.
 
    3.15  TITLE TO PROPERTIES; LIENS.  The Company and/or its Subsidiaries have
good and marketable title to all properties and assets reflected on the Company
Audited Balance Sheet or the Company Interim Balance Sheet or acquired after the
dates thereof (except for properties and assets sold or otherwise disposed of in
the ordinary course of business since the dates thereof), which includes each
asset the absence or unavailability of which would have a Company Material
Adverse Effect, subject only to (a) statutory Liens arising or incurred in the
ordinary course of business with respect to which the underlying obligations are
not delinquent, (b) with respect to personal property, the rights of customers
of the Company or any Subsidiary with respect to inventory or work in progress
under orders or contracts entered into by the Company or any Subsidiary in the
ordinary course of business, (c) Liens reflected on the Company Audited Balance
Sheet or the Company Interim Balance Sheet, (d) Liens for taxes not yet
delinquent, and (e) and defects in title that would not have a Company Material
Adverse Effect. The term "Lien" as used in this Agreement means any mortgage,
pledge, security interest, encumbrance, lien, claim, or charge of any kind. All
properties and assets purported to be leased by the Company or any Subsidiary
are subject to valid and effective leases that are in full force and effect, and
there does not exist, and the Merger will not result in, any default or event
that with notice or lapse of time, or both or otherwise, would constitute a
default under any such leases which would have a Company Material Adverse
Effect. The properties and assets of the Company and each Subsidiary are in good
working condition. 3.16 Permits, Licenses, Etc. Except as specifically disclosed
on the Disclosure Schedule, the Company and each Subsidiary has all rights,
permits, certificates, licenses, consents, franchises, approvals, registrations,
and
 
                                      B-17
<PAGE>
other authorizations necessary to sell its products and services and otherwise
carry on and conduct its business and to own, lease, use, and operate its
properties and assets at the places and in the manner now conducted and
operated, except those the absence of which would not have a Company Material
Adverse Effect. Neither the Company nor any Subsidiary has received any notice
or claim pertaining to the failure to obtain any permit, certificate, license,
franchise, approval, registration, or other authorization required by any
federal, state, local, or foreign body or authority (including, but not limited
to, any nongovernmental self-regulatory agency) except for any such notice or
claim regarding any such failure that would not have a Company Material Adverse
Effect, nor has the Company or any Subsidiary received any notice or claim
pertaining to the failure to obtain any permit, certificate, license, franchise,
approval, registration, or other authorization from the FDA or any similar
foreign regulatory agency.
 
    3.17  INTELLECTUAL PROPERTY RIGHTS.  The Disclosure Schedule contains a
complete and accurate list of all patents, trademarks, trade names, service
marks, and all applications for or registrations of any of the foregoing that
the Company uses in its business (other than generally available computer
software) as to which the Company or any Subsidiary is the owner or a licensee
(indicating whether such license is exclusive or nonexclusive). To the knowledge
of the Company and except as disclosed on the Disclosure Schedule, the Company
and each Subsidiary exclusively owns, free and clear of any Lien (as defined in
Section 3.14), or is exclusively (unless otherwise indicated in the Disclosure
Schedule) licensed to use, all patents, trademarks, trade names, service marks,
applications for or registrations of any of the foregoing, processes,
inventions, designs, technology, formulas, computer software programs, know-how,
and trade secrets used in or necessary for the conduct of its respective
business as currently conducted or proposed to be conducted and where the lack
of ownership or such license would have a Company Material Adverse Effect (the
"Company Intellectual Property"). Except to the extent specifically disclosed on
the Disclosure Schedule, no claim has been asserted or, to the knowledge of the
Company, threatened by any person, and, to the Company's knowledge, its patent
counsel has not concluded that any claim exists, with respect to the Company's
ownership of the Company Intellectual Property or challenging or questioning the
validity or effectiveness of any license or agreement to which the Company is a
party with respect thereto. To the knowledge of the Company, neither the use of
the Company Intellectual Property by the Company or any Subsidiary in the
present or planned conduct of its business nor any product or service of the
Company or any Subsidiary infringes on the intellectual property rights of any
person. No current or former shareholder, employee, or consultant of the Company
or any Subsidiary has any material rights in or to any of the Company
Intellectual Property. All Company Intellectual Property listed on the
Disclosure Schedule has the status indicated therein and all applications are
still pending in good standing and have not been abandoned. Except to the extent
disclosed on the Disclosure Schedule: (i) to the Company's knowledge, patents
included within the Company Intellectual Property are valid and have not been
challenged in any judicial or administrative proceeding; (ii) the Company and
each Subsidiary have made all statutorily required filings, if any, to record
their interests, and taken reasonable actions to protect their rights, in the
Company Intellectual Property, where the failure to make any such filing, record
such interest or take such other actions could reasonably be expected to have a
Company Material Adverse Effect; (iii) to the knowledge of the Company, no
person or entity nor such person's or entity's business or products has
infringed or misappropriated any Company Intellectual Property or currently is
infringing or misappropriating any Company Intellectual Property; and (iv) no
other person or entity has any right to receive or any obligation to pay a
royalty with respect to any Company Intellectual Property or any product or
service of the Company or any Subsidiary.
 
    3.18  BENEFIT PLANS.
 
        (a) Except to the extent specifically disclosed on the Disclosure
    Schedule, neither the Company nor any Subsidiary sponsors, maintains,
    contributes to, or has sponsored, maintained, or contributed to or been
    required to contribute to, any "employee pension benefit plan" ("Pension
    Plan"), as such term is defined in Section 3(2) of the Employee Retirement
    Income Security Act of 1974, as amended ("ERISA"), including, solely for the
    purpose of this subsection, a plan excluded from coverage by
 
                                      B-18
<PAGE>
    Section 4(b)(5) of ERISA. No failure to comply with applicable provisions of
    ERISA, the Code and other applicable law in connection with any Pension Plan
    presently maintained by the Company or any Subsidiary could reasonably be
    expected to have a Company Material Adverse Effect.
 
        (b) Neither the Company nor any Subsidiary sponsors, maintains,
    contributes to, or has sponsored, maintained, or contributed to or been
    required to contribute to, any Pension Plan that is a "Multiemployer Plan"
    within the meaning of Section 4001(a)(3) of ERISA.
 
        (c) Except to the extent specifically disclosed on the Disclosure
    Schedule, neither the Company nor any Subsidiary sponsors, maintains,
    contributes to, or has sponsored, maintained, contributed to, or been
    required to contribute to, any "employee welfare benefit plan" ("Welfare
    Plan"), as such term is defined in Section 3(1) of ERISA, whether insured or
    otherwise. No failure to comply with applicable provisions of ERISA, the
    Code and other applicable law, including, but not limited to, Section 4980B
    of the Code and Part 6 of Subtitle B of Title I of ERISA, in connection with
    any Welfare Plan presently maintained by the Company or any Subsidiary could
    reasonably be expected to have a Company Material Adverse Effect. Neither
    the Company nor any Subsidiary has established or contributed to any
    "voluntary employees' beneficiary association" within the meaning of Section
    501(c)(9) of the Code.
 
        (d) Except to the extent specifically disclosed on the Disclosure
    Schedule, neither the Company nor any Subsidiary sponsors, maintains, or
    contributes to, or has sponsored, maintained, or contributed to, a
    "self-insured medical reimbursement plan" within the meaning of Section
    105(h) of the Code and the regulations thereunder.
 
        (e) Except to the extent specifically disclosed on the Disclosure
    Schedule, neither the Company nor any Subsidiary currently maintains or
    contributes to any oral or written bonus, profit-sharing, compensation
    (incentive or otherwise), commission, stock option, or other stock-based
    compensation, retirement, severance, change of control, vacation, sick or
    parental leave, dependent care, deferred compensation, cafeteria,
    disability, hospitalization, medical, death, retiree, insurance, or other
    benefit or welfare or other similar plan, policy, agreement, trust, fund, or
    arrangement providing for the remuneration or benefit of all or any
    employees or shareholders or any other person, that is neither a Pension
    Plan nor a Welfare Plan (collectively, the "Compensation Plans").
 
        (f) To the knowledge of the Company, neither any Pension Plans or
    Welfare Plans nor any trust created or insurance contract issued thereunder
    nor any trustee, fiduciary, custodian, or administrator thereof, nor any
    officer, director, or employee of the Company or any Subsidiary, custodian,
    or any other "disqualified person" within the meaning of Section 4975(e)(2)
    of the Code, or "party in interest" within the meaning of Section 3(14) of
    ERISA, with respect to any such plan has engaged in any act or omission that
    could reasonably be expected to result in a Company Material Adverse Effect
    in connection with a liability for breach of fiduciary duties under ERISA or
    a tax or penalty imposed by Section 502 of ERISA.
 
        (g) Except to the extent specifically disclosed on the Disclosure
    Schedule, (i) full and timely payment has been made of all amounts that the
    Company or any Subsidiary is required, under applicable law, with respect to
    any Pension Plan, Welfare Plan, or Compensation Plan, or any agreement
    relating to any Pension Plan, Welfare Plan, or Compensation Plan, to have
    paid as a contribution to each Pension Plan, Welfare Plan, or Compensation
    Plan, (ii) to the extent required by generally accepted accounting
    principles, the Company has made adequate provisions for reserves to meet
    contributions that have not been made because they are not yet due under the
    terms of any Pension Plan, Welfare Plan, or Compensation Plan or related
    agreements, (iii) there will be no change on or before the Closing Date in
    the operation of any Pension Plan, Welfare Plan, or Compensation Plan or
    documents under which any such plan is maintained that will result in an
    increase in the benefit liabilities under such plan, except as may be
    required by law or as provided by the terms of the Pension Plan, Welfare
    Plan, Compensation Plan or document in effect on the date of this Agreement,
 
                                      B-19
<PAGE>
    to the extent disclosed in or attached to the Disclosure Schedule, (iv) the
    IRS has issued favorable determination letters with respect to all Company
    and Subsidiary Pension Plans that are intended to be qualified under Section
    401(a) of the Code, and (v) the Company has made available to Parent
    complete and accurate copies of all Pension Plans, Welfare Plans,
    Compensation Plans, and related agreements, annual reports (Form 5500),
    favorable determination letters, current summary plan descriptions, and all
    employee handbooks or manuals.
 
        (h) Except to the extent specifically disclosed on the Disclosure
    Schedule, the execution of, and performance of the transactions contemplated
    in, this Agreement will not (either alone or upon the occurrence of any
    additional or subsequent events) result in forgiveness of indebtedness or an
    increase in benefits or result in the acceleration of vesting, funding,
    benefit accruals or benefit payments under any Pension Plan, Welfare Plan or
    Compensation Plan. Except to the extent specifically disclosed on the
    Disclosure Schedule, no amount that could reasonably be expected to be
    received (whether in cash or property or the vesting of property) by any
    employee, officer, or director of the Company or any of its affiliates who
    is a "disqualified individual" (as such term is defined in proposed Treasury
    Regulation Section 1.280G-1) under any Pension Plan, Welfare Plan, or
    Compensation Plan currently in effect as a result of any of the transactions
    contemplated by this Agreement would be an "excess parachute payment" (as
    such term is defined in Section 280G(b)(1) of the Code).
 
    3.19  MINUTE BOOKS.  The minute books of the Company and the Subsidiaries,
as previously made available to Parent and its representatives, contain records
of all actions taken at all meetings of and corporate actions or written
consents by the shareholders, Boards of Directors, and committees of the Boards
of Directors of the Company and the Subsidiaries, except for the absence of such
records as would not have a Company Material Adverse Effect.
 
    3.20  INSURANCE POLICIES.  The Disclosure Schedule sets forth a complete and
accurate list of all policies of insurance (with copies attached) maintained by
the Company or any Subsidiary with respect to any of its officers, directors,
employees, shareholders, agents, properties, buildings, machinery, equipment,
furniture, fixtures or operations and a description of each claim made in excess
of $5,000 by the Company or any Subsidiary during the three-year period
preceding the date hereof under any such policy of insurance. All such policies
of insurance are in full force and effect.
 
    3.21  BANK ACCOUNTS.  The Disclosure Schedule sets forth a list of each
bank, broker, or other depository with which the Company or any Subsidiary has
an account or safe deposit box, the names and numbers of such accounts or boxes
and the names of all persons authorized to draw thereon or execute transactions.
 
    3.22  POWERS OF ATTORNEY.  The Disclosure Schedule sets forth the names of
all persons, if any, holding powers of attorney from the Company or any
Subsidiary and a description of the scope of each such power of attorney. The
Company has delivered to Parent prior to the date hereof complete and accurate
copies of all such powers of attorney.
 
    3.23  PRODUCT LIABILITY CLAIMS.  Except to the extent specifically disclosed
on the Disclosure Schedule, during the three-year period preceding the date
hereof neither the Company nor any Subsidiary has received a claim for or based
upon breach of product warranty (other than warranty service and repair claims
in the ordinary course of business not material in amount or significance),
strict liability in tort, negligent manufacture of product, negligent provision
of services or any other allegation of liability, including or resulting in, but
not limited to, product recalls, arising from the materials, design, testing,
manufacture, packaging, labeling (including instructions for use), or sale of
its products or from the provision of services (hereafter collectively referred
to as "Product Liability").
 
    3.24  WARRANTIES.  The terms of all product and service warranties and
product return, sales credit, discount, warehouse allowance, advertising
allowance, demo sales, and credit policies of the Company and each Subsidiary
are specifically set forth on the Disclosure Schedule. The Company has attached
to the Disclosure Schedule complete and accurate copies of all such warranties
and policies.
 
                                      B-20
<PAGE>
    3.25  INVENTORIES.  Except as specifically set forth on the Disclosure
Schedule, all inventories of the Company and its Subsidiaries consist of items
of merchantable quality and quantity usable or salable in the ordinary course of
business, are salable at prevailing market prices that are not less than the
book value amounts thereof or the price customarily charged by the Company or
the applicable Subsidiary therefor, conform to the specifications established
therefor, and have been manufactured in accordance with applicable regulatory
requirements, except to the extent that the failure of such inventories so to
consist, be saleable, conform, or be manufactured would not have a Company
Material Adverse Effect. Except as specifically set forth on the Disclosure
Schedule, the quantities of all inventories, materials, and supplies of the
Company and each Subsidiary (net of the obsolescence reserve therefor shown on
the Company Interim Balance Sheet and determined in the ordinary course of
business consistent with past practice) are not obsolete, damaged, slow-moving,
defective, or excessive, and are reasonable and balanced in the circumstances of
the Company and its Subsidiaries, except to the extent that the failure of such
inventories to be in such conditions would not have a Company Material Adverse
Effect. The Disclosure Schedule sets forth a true and complete list of the
addresses of all warehouses or other facilities in which inventories of the
Company or any Subsidiary are located.
 
    3.26  RELATIONS WITH SUPPLIERS AND CUSTOMERS.  Since January 1, 1995, no
current supplier of the Company or any Subsidiary has cancelled any contract or
order for provision of, and, to the knowledge of the Company, there has been no
threat by any such supplier not to provide, raw materials, products, supplies,
or services to the businesses of the Company and its Subsidiaries either prior
to or following the Merger except for any cancellation or threat which would not
have a Company Material Adverse Effect. Except as specifically set forth on the
Disclosure Schedule, neither the Company nor any Subsidiary has, to the
knowledge of the Company, received any information from any customer that
accounted for more than 5% of the revenues of the Company and its Subsidiaries
during the last full fiscal year reasonably to the effect that such customer
intends to materially decrease the amount of business it does with the
businesses of the Company and its Subsidiaries either prior to or following the
Merger. The Disclosure Schedule lists each supplier to the Company or any
Subsidiary that is the sole source of a particular raw material, product,
supply, or service.
 
    3.27  NO FINDERS.  No act of the Company or any Subsidiary has given or will
give rise to any claim against any of the parties hereto for a brokerage
commission, finder's fee, or other like payment in connection with the
transactions contemplated herein, except payments in the amounts specified on
the Disclosure Schedule to those parties identified thereon who have acted as a
finder for the Company or have been retained by the Company as financial
advisors pursuant to the agreements or other documents described in the
Disclosure Schedule, copies of which have been provided to Parent prior to the
date of this Agreement.
 
    3.28  PROXY STATEMENT.  The Proxy Statement/Prospectus (as defined in
Section 5.4 hereof) and any amendments or supplements thereto will comply as to
form in all material respects with the provisions of the 1934 Act as amended,
and the rules and regulations promulgated thereunder, and none of the
information relating to the Company or its affiliates included or incorporated
therein or in any amendments or supplements thereto, or any schedules required
to be filed with the SEC in connection therewith, will, as of the date mailed to
the Company's shareholders and at the time of the Company Shareholders Meeting,
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading; provided, however, that no representation or warranty is made by the
Company with respect to information relating to Parent or any affiliate of
Parent.
 
    3.29  MERGER FILINGS.  The information as to the Company and the
Subsidiaries or any of their affiliates or shareholders included in the
Company's filing, or submitted to Parent for inclusion in its filing, if any,
required to be submitted under the HSR Act or under any Foreign Merger Laws
shall be true, correct, and complete in all material respects and shall comply
in all material respects with the applicable
 
                                      B-21
<PAGE>
requirements of the HSR Act, the rules and regulations issued by the Federal
Trade Commission pursuant thereto, and the Foreign Merger Laws.
 
    3.30  FAIRNESS OPINION.  The Company has received a written opinion from
Piper Jaffray, Inc. to the effect that, as of the date hereof, the consideration
to be received by the holders of Company Common Stock in the Merger is fair to
such holders from a financial point of view, and the Company will promptly
deliver a copy of such opinion to Parent.
 
    3.31  STATE TAKEOVER LAWS; RIGHTS AGREEMENT.
 
        (a) The Board of Directors of the Company and, in accordance with
    Section 302A.673 of the MBCA, the required committee of such Board of
    Directors have approved the transactions contemplated by this Agreement, the
    Agreements to Facilitate Merger described in Section 5.11 hereof, and the
    Stock Option Agreement described in Section 5.17 hereof such that the
    provisions of Sections 302A.671 and 302A.673 of the MBCA will not apply to
    this Agreement or the Agreements to Facilitate Merger or the Stock Option
    Agreement or any of the transactions contemplated hereby or thereby.
 
        (b) The Company has taken all action and completed all amendments, if
    any, necessary or appropriate so that (i) the Rights Agreement dated as of
    June 26, 1996, as amended, between the Company and Northwest Bank Minnesota,
    N.A. (the "Company Rights Agreement"), is inapplicable to the transactions
    contemplated by the Agreements to Facilitate Merger, the Stock Option
    Agreement and this Agreement, (ii) the execution of this Agreement, the
    Stock Option Agreement, and the Agreements to Facilitate Merger, and the
    consummation of the transactions contemplated hereby and thereby, do not and
    will not result in the ability of any person to exercise any Rights under
    the Company Rights Agreement or enable or require the Rights to separate
    from the shares of Company Common Stock to which they are attached or to be
    triggered or become exercisable, or otherwise result in the occurrence of a
    "Distribution Date" or "Stock Acquisition Date" (as such terms are defined
    in the Company Rights Agreement), and (iii) immediately prior to the
    Effective Time, the Rights under the Company Rights Agreement shall, without
    any payment by the Company or Parent, expire with neither the Company nor
    Parent having any obligations under, and no holder of Rights having any
    rights under, the Rights or the Company Rights Agreement.
 
                                   ARTICLE 4
                         REPRESENTATIONS AND WARRANTIES
                        OF PARENT AND MERGER SUBSIDIARY
 
    Parent and Merger Subsidiary hereby jointly and severally represent and
warrant to the Company as of the date hereof as follows:
 
    4.1  ORGANIZATION.  Each of Parent and Merger Subsidiary is a corporation
duly organized, validly existing, and in good standing under the laws of the
state of Minnesota and has all requisite corporate power and authority to own,
lease, and operate its properties and to carry on its business as now being
conducted. Each of Parent and Merger Subsidiary is duly qualified and in good
standing to do business in each jurisdiction in which the property owned,
leased, or operated by it or the nature of the business conducted by it makes
such qualification necessary and where the failure to qualify could reasonably
be expected to have a Parent Material Adverse Effect (as defined below). "Parent
Material Adverse Effect" means any effect, change or event that, individually or
in the aggregate with all similar effects, changes or events, is or would
reasonably be expected to be material and adverse: (i) to the business,
properties, liabilities, results of operation, or financial condition of Parent
and its subsidiaries, considered as a whole, or (ii) to Parent's ability to
perform any of its obligations under this Agreement or to consummate the Merger.
 
                                      B-22
<PAGE>
    4.2  AUTHORIZATION.  Each of Parent and Merger Subsidiary has the requisite
corporate power and authority to execute and deliver this Agreement and to
consummate the transactions contemplated hereby, and Parent has full corporate
power and authority to prepare, file, and distribute the Registration Statement
(as defined in Section 5.4 hereof). The execution and delivery of this Agreement
by Parent and Merger Subsidiary and the consummation of the transactions
contemplated hereby have been duly and validly authorized and approved by the
Boards of Directors of Parent and Merger Subsidiary and by Parent as the sole
shareholder of Merger Subsidiary, and no other corporate proceedings on the part
of Parent and Merger Subsidiary are necessary to authorize this Agreement or to
consummate the transactions contemplated hereby. This Agreement has been duly
and validly executed and delivered by each of Parent and Merger Subsidiary and
constitutes the valid and binding obligation of Parent and Merger Subsidiary,
enforceable against each of them in accordance with its terms, subject to laws
of general application relating to bankruptcy, insolvency, reorganization,
moratorium or other similar laws affecting creditors' rights generally and rules
of law governing specific performance, injunctive relief, or other equitable
remedies.
 
    4.3  CAPITALIZATION.  As of July 2, 1998, the authorized capital stock of
Parent consisted of (a) 800,000,000 shares of Common Stock with a par value of
$.10 per share, of which there were 469,350,541 shares issued and outstanding
and no shares held in Parent's treasury, and (b) 2,500,000 shares of Preferred
Stock with a par value of $1.00 per share, of which there were no shares issued
and outstanding. The authorized capital stock of Merger Subsidiary consists of
2,500 shares of Merger Subsidiary Common Stock, 100 of which are issued and
outstanding and owned by Parent. All issued and outstanding shares of Parent
Common Stock and Merger Subsidiary Common Stock are, and the shares of Parent
Common Stock to be issued and delivered in the Merger pursuant to Article 1
hereof shall be, at the time of issuance and delivery, validly issued, fully
paid, nonassessable, and free of preemptive rights. The shares of Parent Common
Stock to be issued and delivered in the Merger pursuant to Article 1 hereof
shall be registered under the 1933 Act and duly listed for trading on the NYSE,
subject to official notice of issuance.
 
    4.4  CONSENTS AND APPROVALS.  Except for (i) any applicable requirements of
the 1933 Act, the 1934 Act, state securities laws, the NYSE, the HSR Act, and
Foreign Merger Laws, (ii) the filing and recordation of appropriate merger
documents as required by the MBCA, and (iii) compliance with Sections 302A.471
and 302A.473 of the MBCA regarding dissenters' rights of the Company's
shareholders, the execution and delivery of this Agreement by Parent and Merger
Subsidiary and the consummation of the transactions contemplated hereby will
not: (a) violate any provision of the Articles of Incorporation or Bylaws of
Parent or Merger Subsidiary; (b) violate any statute, rule, regulation, order,
or decree of any public body or authority (including, but not limited to, the
FDA or any nongovernmental self-regulatory agency) by which Parent or any of its
subsidiaries or any of their respective properties or assets may be bound; (c)
require any filing with or permit, consent, or approval of any public body or
authority (including, but not limited to, the FDA or any nongovernmental
self-regulatory agency); or (d) result in any violation or breach of, or
constitute (with or without due notice or lapse of time or both) a default
under, result in the loss of any material benefit under, or give rise to any
right of termination, cancellation, increased payments, or acceleration under,
or result in the creation of any Lien on any of the properties or assets of
Parent or its subsidiaries under, any of the terms, conditions, or provisions of
any note, bond, mortgage, indenture, license, franchise, permit, agreement, or
other instrument or obligation to which Parent or any of its subsidiaries is a
party, or by which any of them or any of their respective properties or assets
may be bound, except (x) in the cases of clauses (b) or (c), where such
violation, failure to make any such filing or failure to obtain such permit,
consent or approval, would not prevent or delay consummation of this Merger or
otherwise prevent Parent from performing its obligations under the Agreement and
would not have a Parent Material Adverse Effect, and (y) in the case of clause
(d), for any such violations, breaches, defaults, or other occurrences that
would not prevent or delay consummation of any of the transaction contemplated
hereby in any material respect, or otherwise prevent Parent from performing its
 
                                      B-23
<PAGE>
obligations under this Agreement in any material respect, and would not have a
Parent Material Adverse Effect.
 
    4.5  REPORTS; FINANCIAL STATEMENTS; ABSENCE OF CHANGES.  Parent has filed
all forms, reports, registration statements, and documents required to be filed
by it with the SEC since January 1, 1995 (such forms, reports, registration
statements and documents, together with any amendments thereto, are referred to
as the "Parent SEC Filings"). As of their respective dates, the Parent SEC
Filings (i) complied as to form in all material respects with the applicable
requirements of the 1933 Act and the 1934 Act, as the case may be, and (ii) did
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements made
therein, in light of the circumstances under which they were made, not
misleading. The audited financial statements and unaudited interim financial
statements included or incorporated by reference in the Parent SEC Filings (i)
were prepared in accordance with generally accepted accounting principles
applied on a consistent basis during the periods involved (except as may be
indicated therein or in the notes thereto), (ii) complied as of their respective
dates in all material respects with applicable accounting requirements and the
published rules and regulations of the SEC with respect thereto, and (iii)
fairly present the consolidated financial position of Parent as of the dates
thereof and the income, cash flows, and changes in shareholders' equity for the
periods involved. Except to the extent disclosed in Parent's subsequent filings
with the SEC or specifically disclosed on SCHEDULE 4.5, since April 30, 1997,
there has not been any change or circumstance that would have a Parent Material
Adverse Effect or as of the date hereof any liabilities or obligations of any
nature (whether absolute, accrued, contingent or otherwise) that would have a
Parent Material Adverse Effect. Except to the extent disclosed in the Parent SEC
Filings or on SCHEDULE 4.5, (i) to Parent's knowledge, there is no
investigation, review, claim, action, suit or proceeding by any federal, state,
local or foreign body or authority (including, but not limited to, the FDA or
any nongovernmental self-regulatory agency) or private party with respect to
Parent that could reasonably be expected to have a Parent Material Adverse
Effect, (ii) all activities of Parent and its subsidiaries have been, and are
currently being, conducted in compliance with all applicable federal, state,
local, and foreign laws, ordinances, regulations, interpretations, judgments,
decrees, injunctions, permits, licenses, certificates, governmental
requirements, orders and other similar items of any court or other governmental
entity (including, but not limited to, those of the FDA or any nongovernmental
self-regulatory agency), the failure to comply with which could reasonably be
expected to have a Parent Material Adverse Effect, (iii) Parent and each of its
subsidiaries has timely filed or otherwise provided all registrations, reports,
data, and other information and applications with respect to its Regulated
Products required to be filed with or otherwise provided to the FDA or any other
federal, state, local, or foreign governmental authorities with jurisdiction
over the manufacture, use or sale of the Regulated Products, and all regulatory
licenses or approvals in respect thereof are in full force and effect, except
for the failure to file timely such registrations, reports, data, information,
and applications or the failure to have such licenses and approvals in full
force and effect would not have a Parent Material Adverse Effect.
 
    4.6  REGISTRATION STATEMENT.  The Registration Statement (as defined in
Section 5.4 hereof) and any amendments or supplements thereto will comply in all
material respects as to form with the 1933 Act, and none of the information
relating to Parent or its affiliates included or incorporated therein or in any
amendments or supplements thereto, or any schedules required to be filed with
the SEC in connection therewith, will, at the time the Registration Statement
becomes effective or as of the date of the Company Shareholders Meeting, contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading; provided, however, that no representation or warranty is made by
Parent with respect to information relating to the Company or any affiliate of
the Company.
 
    4.7  MERGER FILINGS.  The information as to Parent and Merger Subsidiary or
any of their affiliates or shareholders included in Parent's filing, or
submitted to the Company for inclusion in its filing, if any,
 
                                      B-24
<PAGE>
required to be submitted under the HSR Act or under any Foreign Merger Laws
shall be true, correct, and complete in all material respects and shall comply
in all material respects with the applicable requirements of the HSR Act, the
rules and regulations issued by the Federal Trade Commission pursuant thereto,
and Foreign Merger Laws.
 
    4.8  NO FINDERS.  No act of Parent or Merger Subsidiary has given or will
give rise to any claim against any of the parties hereto for a brokerage
commission, finder's fee, or other like payment in connection with the
transactions contemplated herein.
 
                                   ARTICLE 5
                                   COVENANTS
 
    5.1  CONDUCT OF BUSINESS OF THE COMPANY.  Except as contemplated by this
Agreement or to the extent that Parent otherwise consents in writing, during the
period from the date of this Agreement to the Effective Time, the Company and
each Subsidiary will conduct its respective operations according to its ordinary
and usual course of business and consistent with past practice, and the Company
and each Subsidiary will use all reasonable efforts to preserve intact in all
material respects its respective business organizations, to maintain its present
and planned business, to keep available the services of its respective officers
and employees and to maintain satisfactory relationships with licensors,
licensees, suppliers, contractors, distributors, physicians, consultants,
customers, and others having business relationships with it; provided, however,
that the Company will not be required to make any payments or enter into or
amend any contractual arrangements or understandings to satisfy the foregoing
obligations. Without limiting the generality of the foregoing, and except as
otherwise expressly provided in or contemplated by this Agreement, prior to the
Effective Time, neither the Company nor any Subsidiary will, without the prior
written consent of Parent:
 
        (a) amend its Articles of Incorporation or Bylaws;
 
        (b) authorize for issuance, issue, sell, pledge, or deliver (whether
    through the issuance or granting of additional options, warrants,
    commitments, subscriptions, rights to purchase, or otherwise) any stock of
    any class or any securities convertible into shares of stock of any class
    (other than the issuance of the number of shares of Company Common Stock
    indicated in Section 3.4 hereof upon the exercise in accordance with the
    current terms of the stock options and other rights listed in the Disclosure
    Schedule hereof as outstanding on the date of this Agreement, and the actual
    number of shares issued for the final offering period under the Company's
    Employee Stock Purchase Plan in accordance with the Section 3.3 hereof);
 
        (c) split, combine, or reclassify any shares of its capital stock,
    declare, set aside, or pay any dividend or other distribution (whether in
    cash, stock, or property or any combination thereof) in respect of its
    capital stock; or redeem or otherwise acquire any shares of its capital
    stock or other securities; or amend or alter any material term of any of its
    outstanding securities;
 
        (d) other than in the ordinary course of business and consistent with
    past practice, create, incur, or assume any indebtedness for borrowed money,
    or assume, guarantee, endorse, or otherwise become liable or responsible
    (whether directly, contingently, or otherwise) for the obligations of any
    other person, or make any loans, advances or capital contributions to, or
    investments in, any other person; or create, incur or assume any Lien on any
    material asset;
 
        (e) knowingly take any action that would have the effect of jeopardizing
    the qualification of the Merger as a reorganization within the meaning of
    Section 368(a)(2)(E) of the Code;
 
        (f) (i) increase in any manner the compensation of any of its directors,
    officers, employees, shareholders, or consultants, except in the ordinary
    course of business and consistent with past practice or consistent with
    existing contractual commitments, in each case to the extent disclosed in
 
                                      B-25
<PAGE>
    the Disclosure Schedule or accelerate the payment of any such compensation
    (whether or not any such acceleration is consistent with past practice)
    other than as required by existing contractual commitments to the extent
    disclosed in the Disclosure Schedule; (ii) pay or accelerate or otherwise
    modify the payment, vesting, exercisability, Company matching amount, or
    other feature or requirement of any pension, retirement allowance,
    severance, change of control, stock option, or other employee benefit not
    required by any existing plan, agreement, or arrangement or by applicable
    law to any such director, officer, employee, shareholder, or consultant,
    whether past or present, except as determined by the Company to be necessary
    to comply with applicable law or maintain tax-favored status (and any
    nonmaterial changes incidental thereto); or (iii) except for normal
    increases in the ordinary course of business in accordance with its
    customary past practices or consistent with existing contractual
    commitments, in each case to the extent disclosed in the Disclosure
    Schedule, commit itself to any additional or increased pension,
    profit-sharing, bonus, incentive, deferred compensation, stock purchase,
    stock option, stock appreciation right, group insurance, severance, change
    of control, retirement or other benefit, plan, agreement, or arrangement, or
    to any employment or consulting agreement, with or for the benefit of any
    person, or amend any of such plans or any of such agreements in existence on
    the date hereof;
 
        (g) except in the ordinary course of business and consistent with past
    practice or pursuant to contractual obligations existing on the date hereof,
    (i) sell, transfer, mortgage, or otherwise dispose of or encumber any real
    or personal property, (ii) pay, discharge, or satisfy any material claim,
    liability, or obligation (absolute, accrued, contingent, or otherwise), or
    (iii) cancel any debts or waive any claims or rights, which involve payments
    or commitments to make payments that individually exceed $50,000 or, in the
    aggregate, exceed $100,000;
 
        (h) acquire or agree to acquire (i) by merging or consolidating with, or
    by purchasing a substantial portion of the assets of, or by any other
    manner, any portion of the assets of, or by any other manner, any business
    of any corporation, partnership, joint venture, association, or other
    business organization or division thereof or (ii) any assets that are
    material, individually or in the aggregate, to the Company, except as
    provided in subSection (i) below and except purchases of inventory in the
    ordinary course of business consistent with past practice;
 
        (i) make or agree to make any new capital expenditure or expenditures
    that, individually, is in excess of $50,000 or, in the aggregate, are in
    excess of $100,000;
 
        (j) enter into, amend, or terminate any joint ventures or any other
    agreements, commitments, or contracts that, individually or in the
    aggregate, are material to the Company or any Subsidiary (except agreements,
    commitments, or contracts expressly provided for or contemplated by this
    Agreement or for the purchase, sale, or lease of goods, services, or
    properties in the ordinary course of business, consistent with past
    practice), or otherwise make any material change in the conduct of the
    business or operations of the Company or any Subsidiary;
 
        (k) enter into or terminate, or amend, extend, renew, or otherwise
    modify (including, but not limited to, by default or by failure to act) any
    distribution, OEM, independent sales representative, noncompetition,
    licensing, franchise, research and development, supply, or similar contract,
    agreement, or understanding (except agreements, commitments, or contracts
    expressly provided for or contemplated by this Agreement or for the
    purchase, sale, or lease of goods, services, or properties in the ordinary
    course of business, consistent with past practice);
 
        (l) change in any material respect its credit policy as to sales of
    inventories or collection of receivables or its inventory consignment
    practices;
 
        (m) remove or permit to be removed from any building, facility, or real
    property any machinery, equipment, fixture, vehicle, or other personal
    property or parts thereof, except in the ordinary course of business;
 
                                      B-26
<PAGE>
        (n) alter or revise its accounting principles, procedures, methods, or
    practices, except as required by a change in generally accepted accounting
    principles and concurred with by the Company's independent public
    accountants;
 
        (o) institute, settle, or compromise any claim, action, suit, or
    proceeding pending or threatened by or against it involving amounts in
    excess of $100,000, at law or in equity or before any federal, state, local,
    foreign, or other governmental department, commission, board, bureau,
    agency, or instrumentality (including, but not limited to, the FDA or any
    nongovernmental self-regulatory agency);
 
        (p) distribute or otherwise circulate any notices, directives, or other
    communications directed to all or groups of customers, vendors, employees,
    distributors, or others associated with its business relating to the
    transactions contemplated hereby or to the operation of business after
    completion of the Merger without consulting with Parent, giving Parent
    reasonable opportunity to comment thereon, and obtaining prior to
    distribution Parent's approval thereof, which shall not unreasonably be
    withheld;
 
        (q) knowingly take any action that would cause the condition set forth
    in Section 6.2(a) not to be met; or
 
        (r) agree, whether in writing or otherwise, to do any of the foregoing.
 
provided, however, that in the event that the Company or any of its Subsidiaries
would be prohibited from taking any action by reason of this Section 5.1 without
the prior written consent of Parent, such action may nevertheless be taken if
the Company or any of its Subsidiaries is expressly required to do so by law and
the Company prior to taking such action informs Parent in writing of such
requirement.
 
    5.2  NO SOLICITATION.  From the date hereof until the termination of this
Agreement, the Company will not and will cause its Subsidiaries and its and
their respective officers, directors, employees, representatives, agents, or
affiliates (including, but not limited to any investment banker, attorney, or
accountant retained by the Company or any Subsidiary), to not, directly or
indirectly, solicit, encourage, initiate, or participate in any way in
discussions or negotiations with, or knowingly provide any information to, any
corporation, partnership, person, or other entity or group (other than Parent or
any affiliate or agent of Parent) concerning any merger, sale or licensing of
any significant portion of the assets, sale of shares of capital stock
(including without limitation any proposal or offer to the Company's
shareholders), or similar transactions involving the Company or any Subsidiary
(an "Alternative Proposal"), or otherwise facilitate any effort or attempt to
make or implement an Alternative Proposal. The Company will promptly communicate
to Parent the terms of any proposal or inquiry that it has received or may
receive in respect of any such transaction or of any such information requested
from it or of any such negotiations or discussions being sought to be initiated
with the Company and may inform any third party who contacts the Company on an
unsolicited basis concerning an Alternative Proposal that the Company is
obligated hereunder to disclose such to Parent. Notwithstanding the foregoing,
this Section shall not prohibit the Board of Directors of the Company from (i)
furnishing information to or entering into discussions or negotiations with, any
person or entity that makes an unsolicited bona fide Alternative Proposal, if,
and only to the extent that, (a) the Board of Directors of the Company
determines in good faith, after receipt of advice to such effect from outside
legal counsel, that such action is so required for the board of Directors to
comply with its fiduciary duties to shareholders imposed by law, (b) prior to
furnishing information to, or entering into discussions and negotiations with,
such person or entity, the Company promptly provides written notice to Parent to
the effect that it is furnishing information to, or entering into discussions or
negotiations with, such person or entity, and (c) the Company keeps Parent
informed of the status and all material terms and events with respect to any
such Alternative Proposal; and (ii) to the extent applicable, complying with
Rules 14d-9 and 14e-2 promulgated under the 1934 Act, as amended, with regard to
an Alternative Proposal. Nothing in this Section shall (x) permit the Company to
terminate this Agreement (except as specifically provided in Article 7 hereof),
(y) permit the Company to enter into any agreement with respect to an
Alternative Proposal for as long as this Agreement remains in effect (it
 
                                      B-27
<PAGE>
being agreed that for as long as this Agreement remains in effect, the Company
shall not enter into any agreement with any person that provides for, or in any
way facilitates, an Alternative Proposal), or (z) affect any other obligation of
the Company under this Agreement while this Agreement remains in effect.
 
    5.3  ACCESS AND INFORMATION.  The Company shall afford to Parent, and to
Parent's accountants, officers, directors, employees, counsel, and other
representatives, reasonable access during normal business hours, from the date
hereof through the Effective Time, to all of its properties, books, contracts,
commitments, and records, and, during such period, the Company shall furnish
promptly to Parent all information concerning the Company's and its
Subsidiaries' businesses, prospects, properties, liabilities, results of
operations, financial condition, testing, clinicals, officers, employees,
investigators, distributors, customers, suppliers, and others having dealings
with the Company as Parent may reasonably request and reasonable opportunity to
contact and obtain information from such officers, employees, investigators,
distributors, customers, suppliers, and others having dealings with the Company
as Parent may reasonably request, subject, however, to limitations under
existing confidentiality agreements with other bidders with respect to prior
offers. During the period from the date hereof to the Effective Time, the
parties shall in good faith meet and correspond on a regular basis for mutual
consultation concerning the conduct of the Company's and the Subsidiaries'
businesses and, in connection therewith, Parent shall be entitled to have
employees or other representatives present at the offices of the Company and its
Subsidiaries to observe, and be kept informed concerning, the Company's and the
Subsidiaries' operations and business planning. Parent shall hold in confidence
all such nonpublic information as required and in accordance with the
confidentiality letter agreement dated June 2, 1998, between Parent and the
Company, as amended by the amendment to confidentiality letter agreement dated
the same date (the "Confidentiality Agreement").
 
    5.4  APPROVAL OF SHAREHOLDERS; PROXY STATEMENT; REGISTRATION STATEMENT.
 
        (a) The Company shall take all action necessary in accordance with
    Minnesota law and the Company's Articles of Incorporation and Bylaws to
    cause a special meeting of the Company's shareholders (the "Company
    Shareholders Meeting") to be duly called and held as soon as reasonably
    practicable following the date upon which the Registration Statement (as
    defined below) becomes effective for the purpose of voting upon the Merger.
    The shareholder vote or consent required for approval of the Plan of Merger
    and the Merger shall be no greater than that set forth in the MBCA and the
    Company's Articles of Incorporation as previously provided to Parent.
    Accordingly, the Company represents and warrants that the affirmative vote
    of the holders of record of a majority of the outstanding shares of Company
    Common Stock is all that is necessary to obtain shareholder approval of the
    Plan of Merger and the Merger. The Company shall use all reasonable efforts
    to obtain the approval by the Company's shareholders of this Agreement, the
    Plan of Merger, and the Merger. In accordance therewith, the Company shall,
    with the cooperation of Parent, prepare and file, as soon as reasonably
    practicable, a proxy statement/prospectus included as part of the
    Registration Statement (such proxy statement/prospectus, together with
    notice of meeting, form of proxy, and any letter or other materials to the
    Company's shareholders included therein are referred to in this Agreement as
    the "Proxy Statement/Prospectus"). The Company shall use all reasonable
    efforts to cause the definitive Proxy Statement/Prospectus to be mailed to
    the shareholders of the Company, as soon as reasonably practicable following
    its effectiveness, with the date of mailing as mutually determined by the
    Company and Parent. The Company will, through its Board of Directors,
    recommend to its shareholders approval of the Merger in the definitive Proxy
    Statement/Prospectus.
 
        (b) Parent shall, with the cooperation of the Company, prepare and file,
    as soon as reasonably practicable, a registration statement under the 1933
    Act registering the shares of Parent Common Stock to be issued in the Merger
    (the "Registration Statement"), which Registration Statement shall include
    the Proxy Statement/Prospectus. Parent will use all reasonable efforts to
    have the Registration Statement declared effective by the SEC as promptly
    thereafter as practicable. Parent shall also take any action required to be
    taken under state blue sky or securities laws in connection with the
    issuance
 
                                      B-28
<PAGE>
    of Parent Common Stock pursuant to the Merger. The Company shall furnish to
    Parent all information concerning the Company and its Subsidiaries and the
    holders of its capital stock, and shall take such other action and otherwise
    cooperate, as Parent may reasonably request in connection with any such
    action.
 
        (c) Parent shall notify the Company promptly of the receipt of the
    comments of the SEC and of any request by the SEC for amendments or
    supplements to the Registration Statement and shall supply the Company with
    copies of all correspondence with the SEC with respect to the Registration
    Statement.
 
        (d) If at any time prior to the Company Shareholders Meeting, any event
    should occur relating to the Company, any Subsidiary, or the Company's
    officers or directors that is required to be described in an amendment or
    supplement to the definitive Proxy Statement/Prospectus or the Registration
    Statement, the Company shall promptly inform Parent. If at any time prior to
    the Company Shareholders Meeting, any event shall occur relating to Parent
    or Merger Subsidiary or their respective officers or directors that is
    required to be described in an amendment or supplement to the definitive
    Proxy Statement/Prospectus or the Registration Statement, Parent shall
    promptly inform the Company. Whenever any event occurs that should be
    described in an amendment of, or supplement to, the definitive Proxy
    Statement/Prospectus or the Registration Statement, the Company or Parent,
    as the case may be, shall, upon learning of such event, promptly notify the
    other and consult and cooperate with the other in connection with the
    preparation of a mutually acceptable amendment or supplement. The parties
    shall promptly file such amendment or supplement with the SEC and mail such
    amendment or supplement as soon as practicable after it is cleared by the
    SEC.
 
    5.5  CONSENTS.  The Company will, at its cost and expense, use all
reasonable efforts to obtain all approvals and consents of all third parties
necessary on the part of the Company or its Subsidiaries to consummate the
transactions contemplated hereby. Parent agrees to cooperate with the Company in
connection with obtaining such approvals and consents. Parent will, at its cost
and expense, use all reasonable efforts to obtain all approvals and consents of
all third parties necessary on the part of Parent to consummate the transactions
contemplated hereby. The Company agrees to cooperate with Parent in connection
with obtaining such approvals and consents.
 
    5.6  AFFILIATES' LETTERS.
 
        (a) The Company has delivered to Parent a list of names and addresses of
    those persons, in the Company's reasonable judgment after consultation with
    outside legal counsel, who, as of the date hereof, are affiliates within the
    meaning of Rule 145 of the rules and regulations promulgated under the
    Securities Act (each such person, an "Affiliate") of the Company. The
    Company shall provide Parent such information and documents as Parent shall
    reasonably request for purposes of reviewing such list and shall promptly
    update such list to reflect any changes thereto. The Company has caused to
    be delivered to Parent an affiliate's letter in the form attached hereto as
    EXHIBIT B, executed by each of the Affiliates of the Company identified in
    the foregoing list who were available, and shall use all reasonable efforts
    to deliver or cause to be delivered to Parent as soon as practicable prior
    to the Effective Time such an affiliate's letter executed by any Affiliate
    who was not available to sign and deliver such letter on or prior to the
    date hereof and by any additional persons who become Affiliates after the
    date hereof. Parent shall be entitled to place legends as specified in such
    affiliates' letters on the certificates evidencing any of the Parent Common
    Stock to be received by such Affiliates pursuant to the terms of this
    Agreement, and to issue appropriate stop transfer instructions to the
    transfer agent for the Parent Common Stock, consistent with the terms of
    such letters.
 
        (b) For so long as resales of shares of Parent Common Stock issued
    pursuant to the Merger are subject to the resale restrictions set forth in
    Rule 145 under the Securities Act, Parent will use all reasonable efforts to
    comply with Rule 144(c)(1) under the Securities Act.
 
                                      B-29
<PAGE>
    5.7  EXPENSES.  Whether or not the Merger is consummated, all costs and
expenses incurred in connection with this Agreement, the transactions
contemplated hereby, the Proxy Statement/Prospectus, and the Registration
Statement will be paid by the party incurring such costs and expenses, except
that the Company and Parent will share equally the cost of printing and filing
with the SEC the Proxy Statement/ Prospectus and the Registration Statement, the
filing fees required under the HSR Act or any Foreign Merger Laws, and the fees
charged by PricewaterhouseCoopers LLP for the letters described in Section 5.15
(the "Shared Expenses").
 
    5.8  FURTHER ACTIONS.  Subject to the terms and conditions herein provided
and without being required to waive any conditions herein (whether absolute,
discretionary, or otherwise), each of the parties hereto agrees to use all
commercially reasonable efforts to take, or cause to be taken, all action, and
to do, or cause to be done, all things necessary, proper, or advisable to
consummate and make effective the transactions contemplated by this Agreement.
In case at any time after the Effective Time any further action is necessary or
desirable to carry out the purposes of this Agreement, the proper officers and
directors of each party to this Agreement shall take all such necessary action.
 
    5.9  REGULATORY APPROVALS.  The Company and Parent will take all reasonable
action as may be necessary under federal or state securities laws or the HSR Act
or Foreign Merger Laws applicable to or necessary for, and will file as soon as
reasonably practicable and, if appropriate, use all reasonable efforts to have
declared effective or approved all documents and notifications with the SEC and
other governmental or regulatory bodies (including, without limitation, the FDA
and equivalent foreign regulatory bodies, and other foreign regulatory bodies
that administer Foreign Merger Laws, and any foreign labor councils or bodies as
may be required) that they deem necessary or appropriate for, the consummation
of the Merger and the transactions contemplated hereby, and each party shall
give the other information reasonably requested by such other party pertaining
to it and its subsidiaries and affiliates to enable such other party to take
such actions. Notwithstanding the foregoing or anything herein to the contrary,
neither Parent nor Merger Subsidiary shall be required to make arrangements for
or to effect the cessation, sale, or other disposition of particular assets or
categories of assets or businesses of Parent, Merger Subsidiary, the Company, or
any of their affiliates.
 
    5.10  CERTAIN NOTIFICATIONS.  From time to time prior to the Effective Time
within 5 days of the end of each calendar month, the Company will provide
written notice to the Parent of any matter which, if existing, occurring or
known at the date of this Agreement, would have been required to be set forth or
described in the Disclosure Schedule or which is necessary to correct any
information in the Disclosure Schedule which has been rendered inaccurate
thereby, or (b) would constitute a breach of any covenant contained in this
Agreement. For purposes of determining the accuracy of the representations and
warranties of the Company contained in Article 3 of this Agreement in order to
determine the fulfillment of the conditions set forth in Section 6.2(a) and to
determine whether a breach has occurred for purposes of Section 6.2(b) or
pursuant to Section 7.1(g) hereof, the Disclosure Schedule delivered by Company
in accordance with Section 3.1 shall be deemed to include only the information
contained therein when delivered in accordance with Section 3.1 and shall be
deemed to exclude any information contained in any subsequent notifications
hereunder.
 
    5.11  VOTING OF SHARES.  To induce Parent to execute this Agreement, certain
officers and directors of the Company have executed and delivered as of the date
hereof (and prior to the Company's execution and delivery of the Stock Option
Agreement described in Section 5.17 below) Agreements to Facilitate Merger in
the form attached hereto as EXHIBIT C, pursuant to which each such person has
agreed to vote his or her shares of Company Common Stock in favor of the Merger
at the Company Shareholders Meeting. At the request of Parent, after the
execution of this Agreement the Company will use all reasonable efforts to have
other officers and directors of the Company also execute Agreements to
Facilitate Merger.
 
    5.12  NONCOMPETITION AGREEMENTS.  To induce Parent to execute this
Agreement, the Company has caused Anthony Badolato and Allan Seck to execute and
deliver to Parent as of the date hereof (but
 
                                      B-30
<PAGE>
expressly contingent upon the Closing of the Merger), noncompetition agreements
substantially in the form of EXHIBIT D hereto each with a term of 42 months from
the Effective Time, and the Company shall use all reasonable efforts to cause
Gregory Melsen, William Haworth and Bradley Goskowicz to execute and deliver to
Parent within 30 days of the date hereof (but expressly contingent upon the
Closing of the Merger) noncompetition agreements substantially in the form of
EXHIBIT D hereto each with a term of 24 months from the Effective Time.
 
    5.13  NYSE LISTING APPLICATION.  Parent shall prepare and submit to the NYSE
a listing application for the Parent Common Stock to be issued in the Merger
pursuant to Article 1 of this Agreement. The Company shall cooperate with Parent
in such listing application.
 
    5.14  INDEMNIFICATION.  Parent agrees that it will, after the Effective
Time, provide to those individuals who have served as directors or officers of
the Company or its Subsidiaries indemnification equivalent to that provided by
the Articles of Incorporation and Bylaws of the Company with respect to matters
occurring prior to the Effective Time, including without limitation the
authorization of this Agreement and the transactions contemplated hereby, for a
period of six years from the Effective Time (or, in the case of matters
occurring prior to the Effective Time which, have not been resolved prior to the
sixth anniversary, until such matters are finally resolved). To the extent
permitted by law, Parent will advance expenses in connection with the foregoing
indemnification. In the event the Surviving Corporation or any of its successors
or assigns (i) consolidates with or merges into any other person and the
Surviving Corporation shall not be the continuing or surviving corporation or
entity of such consolidation or merger or (ii) transfers all or substantially
all of its properties and assets to any person, then, and in each such case,
proper provision shall be made so that the successors and assigns of the
Surviving Corporation shall assume the obligations set forth in this Section
5.14. For a period of six years after the Effective Time, Parent will provide
that portion of directors' and officers' liability insurance that serves to
reimburse officers and directors of the Company and its Subsidiaries with
respect to claims against such officers and directors arising from facts or
events that occurred before the Effective Time of at least the same coverage and
amounts, and containing terms and conditions no less advantageous, as that
coverage currently provided by the Company and its Subsidiaries.
 
    5.15  [INTENTIONALLY OMITTED]
 
    5.16  SUBSIDIARY SHARES.  At or prior to the Closing, the Company shall
cause all issued and outstanding Subsidiary shares owned by any person other
than the Company to be transferred for no or nominal consideration to such
person or persons designated by Parent.
 
    5.17  STOCK OPTION AGREEMENT.  To induce Parent to execute this Agreement,
the Company has executed and delivered to Parent as of the date hereof (and
after the execution and delivery of certain Agreements to Facilitate Merger
described in Section 5.11 above) a Stock Option Agreement in the form attached
hereto as EXHIBIT E, pursuant to which the Company has granted to Parent an
option to acquire from the Company such number of shares of Company Common Stock
as equals 19.9% of the aggregate number of outstanding shares of Company Common
Stock, at an exercise price equal to $11.125 per share or such lesser amount as
is described in the second paragraph of Section 1.3(a) hereof. Such option shall
become exercisable only in the events described in the Stock Option Agreement.
 
    5.18  BENEFIT PLANS AND EMPLOYEE MATTERS.  From and after the Effective
Time, Parent shall to the extent practicable cause the Surviving Corporation to
provide employee benefits and programs to the Company's employees that, in the
aggregate, are substantially comparable or more favorable than those in
existence as of the date hereof and disclosed in writing to Parent prior to the
date hereof.
 
    5.19  TAX.  Parent agrees that it will not knowingly take any action that
would have the effect of jeopardizing the qualification of the Merger as a
reorganization within the meaning of Section 368(a)(2)(E) of the Code.
 
                                      B-31
<PAGE>
                                   ARTICLE 6
                               CLOSING CONDITIONS
 
    6.1  CONDITIONS TO OBLIGATIONS OF PARENT, MERGER SUBSIDIARY, AND THE
COMPANY.  The respective obligations of each party to consummate the Merger
shall be subject to the fulfillment at or prior to the Closing of the following
conditions:
 
        (a) NO INJUNCTION. None of Parent, Merger Subsidiary, or the Company
    shall be subject to any final order, decree, or injunction of a court of
    competent jurisdiction within the United States that (i) prevents or
    materially delays the consummation of the Merger, or (ii) would impose any
    material limitation on the ability of Parent effectively to exercise full
    rights of ownership of the Company or the assets or business of the Company.
 
        (b) SHAREHOLDER APPROVAL. The approval of the shareholders of the
    Company referred to in Section 5.4 hereof shall have been obtained, in
    accordance with the MBCA and the Company's Articles of Incorporation and
    Bylaws.
 
        (c) REGISTRATION STATEMENT. The Registration Statement (as amended or
    supplemented) shall have become effective under the 1933 Act and shall not
    be subject to any "stop order," and no action, suit, proceeding, or
    investigation by the SEC to suspend the effectiveness or qualification
    thereof shall have been initiated and be continuing or have been threatened
    and be unresolved. Parent shall also have received all state securities law
    or blue sky authorizations necessary to carry out the transactions
    contemplated hereby.
 
        (d) NYSE LISTING. The shares of Parent Common Stock to be delivered
    pursuant to the Merger shall have been duly listed on the NYSE, subject to
    official notice of issuance.
 
        (e) WAITING PERIODS. The waiting periods applicable to the consummation
    of the Merger under the HSR Act and any Foreign Merger Laws shall have
    expired or been terminated.
 
    6.2  CONDITIONS TO OBLIGATIONS OF PARENT AND MERGER SUBSIDIARY.  The
respective obligations of Parent and Merger Subsidiary to consummate the Merger
shall be subject to the fulfillment at or prior to the Closing of the following
additional conditions:
 
        (a) REPRESENTATIONS AND WARRANTIES TRUE. Each representation and
    warranty of the Company contained in this Agreement, without regard to any
    qualification or reference to immateriality or "Company Material Adverse
    Effect," shall be true and correct on the date hereof and on the Closing
    Date as though such representations and warranties were made on such date
    (except those representations and warranties that address matters only as of
    a particular date shall remain true and correct as of such date), except for
    any inaccuracies that, individually or in the aggregate, have not had, and
    would not have, a Company Material Adverse Effect.
 
        (b) PERFORMANCE. The Company shall have performed and complied in all
    material respects with all agreements, obligations, and conditions required
    by this Agreement to be performed or complied with by it on or prior to the
    Closing, and Parent shall have received a certificate to such effect signed
    by the Chief Executive Officer of the Company.
 
        (c) CONSENTS. The Company shall have obtained all permits,
    authorizations, consents, and approvals required on its part to perform its
    obligations under, and consummate the transactions contemplated by, this
    Agreement, in form and substance reasonably satisfactory to Parent, and
    Parent and Merger Subsidiary shall have received evidence reasonably
    satisfactory to them of the receipt of such permits, authorizations,
    consents, and approvals.
 
        (d) OPINION OF COUNSEL FOR THE COMPANY. Parent and Merger Subsidiary
    shall have received an opinion of Oppenheimer Wolff & Donnelly LLP, counsel
    to the Company, dated the Closing Date, in form and substance reasonably
    satisfactory to Parent, to the effect set forth in EXHIBIT F hereto.
 
                                      B-32
<PAGE>
        (e) AFFILIATES' LETTERS. Parent shall have received a letter from each
    of the Affiliates pursuant to Section 5.6 hereof.
 
        (f) NONCOMPETITION AGREEMENTS. Parent shall have received executed
    agreements from such persons, and in such form satisfactory to Parent, as
    described in Section 5.12 hereof.
 
        (g) RESIGNATIONS. Such officers and directors of the Company or of any
    Subsidiary as shall have been specified Parent shall have tendered their
    respective resignations effective as of the Effective Time.
 
        (h) [Intentionally omitted]
 
        (i) CONTINUED EMPLOYMENT OF CEO. The chief executive officer of the
    Company shall have agreed to continue his employment with the Company
    following the Merger on such terms as are mutually satisfactory to Parent
    and such officer.
 
        (j) SUBSIDIARY SHARES. The transfer of Subsidiary shares as provided in
    Section 5.16 shall have occurred.
 
    6.3  CONDITIONS TO OBLIGATIONS OF THE COMPANY.  The obligation of the
Company to consummate the Merger shall be subject to the fulfillment at or prior
to the Closing of the following additional conditions:
 
        (a) REPRESENTATIONS AND WARRANTIES TRUE. Each representation and
    warranty of Parent contained in this Agreement, without regard to any
    qualification or reference to immateriality or "Parent Material Adverse
    Effect," shall be true and correct on the date of this Agreement and on the
    Closing Date as though such representations and warranties were made on such
    date (except those representations and warranties that address matters only
    as of a particular date shall remain true and correct as of such date),
    except for any inaccuracies that, individually or in the aggregate, have not
    had, and would not have, a Parent Material Adverse Effect.
 
        (b) PERFORMANCE. Parent and Merger Subsidiary shall have performed and
    complied in all material respects with all agreements, obligations, and
    conditions required by this Agreement to be performed or complied with by
    them on or prior to the Closing.
 
        (c) CONSENTS. Parent and Merger Subsidiary shall have obtained all
    permits, authorizations, consents, and approvals required on their part to
    perform their obligations under, and consummate the transactions
    contemplated by, this Agreement, in form and substance satisfactory to the
    Company, and the Company shall have received evidence satisfactory to it of
    the receipt of such permits, authorizations, consents, and approvals.
 
        (d) OPINION OF COUNSEL FOR PARENT. The Company shall have received an
    opinion of Fredrikson & Byron, P.A., counsel to Parent, dated the Closing
    Date, in form and substance reasonably satisfactory to the Company, to the
    effect set forth in Exhibit G hereto.
 
        (e) TAX OPINION. The Company shall have received an opinion of
    Oppenheimer Wolff & Donnelly LLP, counsel to the Company, to the effect
    that, subject to customary conditions and representations, the Merger will
    be treated for federal income tax purposes as a reorganization within the
    meaning of Section 368(a)(2)(E) of the Code. This condition shall be deemed
    waived in the event that such tax opinion is not rendered because the
    Company or its shareholders have failed to provide such customary
    representations.
 
                                   ARTICLE 7
                          TERMINATION AND ABANDONMENT
 
    7.1  TERMINATION.  This Agreement may be terminated at any time prior to the
Effective Time, whether before or after approval by the shareholders of the
Company, only:
 
                                      B-33
<PAGE>
        (a) by mutual written consent duly authorized by the Board of Directors
    of Parent and the Board of Directors of the Company;
 
        (b) by either Parent or the Company if the Merger shall not have been
    consummated on or before the date that is six months after the date hereof;
    provided, however, that the terminating party shall not have breached in any
    material respect its obligations under this Agreement in any manner that
    shall have been the proximate cause of, or resulted in, the failure to
    consummate the Merger by such date and provided further, however, that, if a
    request for additional information is received from the U.S. Federal Trade
    Commission ("FTC") or Department of Justice ("DOJ") pursuant to the HSR Act
    or additional information is requested by an authority (a "Foreign
    Authority") pursuant to Foreign Merger Laws, such date shall be extended to
    the 90th day following acknowledgment by the FTC, DOJ, or Foreign Authority,
    as applicable, that Parent and the Company have complied with such request,
    but in any event not later than nine months from the date hereof;
 
        (c) by either Parent or the Company if a court of competent jurisdiction
    or an administrative, governmental, or regulatory authority has issued a
    final nonappealable order, decree, or ruling, or taken any other action,
    having the effect of permanently restraining, enjoining, or otherwise
    prohibiting the Merger;
 
        (d) by either Parent or the Company if, at the Company Shareholders
    Meeting, the requisite vote of the shareholders of the Company is not
    obtained, except that the right to terminate this Agreement under this
    Section 7.1(d) will not be available to any party whose failure to perform
    any material obligation under this Agreement has been the proximate cause
    of, or resulted in, the failure to obtain the requisite vote of the
    shareholders of the Company;
 
        (e) by Parent if either (i) the Company has breached its obligations
    under Section 5.2 in any material respect, (ii) the Board of Directors of
    the Company has recommended, approved, accepted, or entered into an
    agreement regarding, an Alternative Proposal, as defined in Section 5.2,
    (iii) the Board of Directors of the Company has withdrawn or modified in a
    manner adverse to Parent its recommendation of the Merger, or (iv) a tender
    offer or exchange offer for 15% or more of the outstanding shares of Company
    Common Stock is commenced, and the Board of Directors of the Company, within
    10 business days after such tender offer or exchange offer is so commenced,
    either fails to recommend against acceptance of such tender offer or
    exchange offer by its shareholders or takes no position with respect to the
    acceptance of such tender offer or exchange offer by its shareholders;
 
        (f) by the Company if (i) it is not in material breach of its
    obligations under Section 5.2, (ii) the Board of Directors of the Company
    has authorized acceptance of an Alternative Proposal, and (iii) the Company
    has paid to Parent the fee required by Section 7.2 to be paid to Parent in
    the manner therein provided;
 
        (g) by Parent if (i) Parent is not in material breach of its obligations
    under this Agreement and (ii) there has been a material breach by the
    Company of any of its representations, warranties, or obligations under this
    Agreement of by an Affiliate of the Company under such person's affiliate's
    letter described in Section 5.6 or by an officer or director of the Company
    under such person's Agreement to Facilitate Merger described in Section 5.11
    such that the conditions in Section 6.2 will not be satisfied, and the
    breach is not curable or, if curable, is not cured by the Company within 30
    calendar days after receipt by the Company of written notice from Parent of
    such breach;
 
        (h) by the Company if (i) the Company is not in material breach of its
    obligations under this Agreement and (ii) there has been a material breach
    by Parent of any of its representations, warranties, or obligations under
    this Agreement such that the conditions in Section 6.3 will not be
    satisfied, and the breach is not curable or, if curable, is not cured by
    Parent within 30 calendar days after receipt by Parent of written notice
    from the Company of such breach.
 
                                      B-34
<PAGE>
        (i) by Parent if, within 10 business days following receipt of the
    Disclosure Schedule as described in Section 3.1, Parent determines that the
    Disclosure Schedule contains information which in Parent's good faith,
    reasonable business judgment adversely affects the value of the Company's
    business or prospects.
 
    7.2  EFFECT OF TERMINATION.
 
        (a) In recognition of the time, efforts, and expenses expended and
    incurred by Parent with respect to the Company and the opportunity that the
    acquisition of the Company presents to Parent, if:
 
           (i) this Agreement is terminated pursuant to Section 7.1(e) or
       7.1(f); or
 
           (ii) any third party makes an Alternative Proposal to which the
       Company has made a response or any third party acquires 15% or more of
       the outstanding Company Common Stock prior to the Company Shareholders
       Meeting, and either (A) the requisite vote of the shareholders of the
       Company to approve the Merger is not obtained or (B) this Agreement is
       terminated pursuant to Section 7.1(g) where the Company's breach is
       willful and intentional or is terminated pursuant to Section 7.1(d),
 
    then, in any such event, the Company will pay to Parent, upon the
    termination date in the event of termination pursuant to Section 7.1(f), and
    immediately upon the date of entering into an agreement providing for an
    Alternative Proposal (if such agreement is entered into within 12 months of
    the termination of this Agreement), in the case of a termination pursuant to
    Section 7.1(e) or in the case of the events specified in clause (ii) above
    (by wire transfer of immediately available funds to an account designated by
    Parent for such purpose), a fee equal to $2.75 million. The Company
    acknowledges that the agreements contained in this Section 7.2 are an
    integral part of the transactions contemplated by this Agreement and are not
    a penalty, and that, without these agreements, Parent would not enter into
    this Agreement. If the Company fails to pay promptly the fee due pursuant to
    this Section 7.2, the Company shall also pay to Parent Parent's costs and
    expenses (including legal fees and expenses) in connection with any action,
    including the filing of any lawsuit or other legal action, taken to collect
    payment, together with interest on the amount of the unpaid fee under this
    section, accruing from its due date, at an interest rate per annum equal to
    two percentage points in excess of the prime commercial lending rate quoted
    by Norwest Bank Minnesota, N.A. Any change in the interest rate hereunder
    resulting from a change in such prime rate shall be effective at the
    beginning of the day of such change in such prime rate.
 
        (b) Except as provided in the next sentence of this paragraph, in the
    event of the termination of this Agreement pursuant to any paragraph of
    Section 7.1, the obligations of the parties to consummate the Merger will
    expire, and none of the parties will have any further obligations under this
    Agreement except pursuant to Sections 5.3, 5.7, and 7.2(a) and which shall
    survive termination of this Agreement. In the event of the termination of
    this Agreement pursuant to any paragraph of Section 7.1 that is caused by a
    breach of a party, the party whose breach was the basis for the termination
    will not be relieved from any liability for its breach or its obligations
    pursuant to Section 7.2(a), and the other party will have no further
    obligations under this Agreement except as provided in Sections 5.3 and 5.7
    and Article 8.
 
                                   ARTICLE 8
                                 MISCELLANEOUS
 
    8.1  AMENDMENT AND MODIFICATION.  Subject to applicable law, this Agreement
may be amended, modified, or supplemented only by written agreement of Parent,
Merger Subsidiary, and the Company at any time prior to the Effective Time with
respect to any of the terms contained herein. This Agreement may not be amended
except by an instrument in writing signed on behalf of each of the parties
hereto.
 
                                      B-35
<PAGE>
    8.2  WAIVER OF COMPLIANCE; CONSENTS.  Any failure of Parent or Merger
Subsidiary on the one hand, or the Company on the other hand, to comply with any
obligation, covenant, agreement, or condition herein may be waived by the
Company or Parent, respectively, only by a written instrument signed by an
officer of the party granting such waiver, but such waiver or failure to insist
upon strict compliance with such obligation, covenant, agreement, or condition
shall not operate as a waiver of, or estoppel with respect to, any subsequent or
other failure. Whenever this Agreement requires or permits consent by or on
behalf of any party hereto, such consent shall be given in writing. Merger
Subsidiary agrees that any consent or waiver of compliance given by Parent
hereunder shall be conclusively binding upon Merger Subsidiary, whether or not
given expressly on its behalf.
 
    8.3  INVESTIGATION; SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  The
respective representations and warranties of Parent and the Company contained
herein or in any certificates or other documents delivered prior to or at the
Closing shall not be deemed waived or otherwise affected by any investigation
made by any party hereto. Each and every representation and warranty contained
herein shall be deemed to be conditions to the Merger and shall not survive the
Merger. This Section 8.3 shall have no effect upon any other obligation of the
parties hereto, whether to be performed before or after the Closing. Parent
acknowledges and agrees that (i) other than the representations and warranties
of the Company and its Subsidiaries specifically contained in this Agreement,
including for this purpose the Disclosure Schedule and other matters referred to
in this Agreement or the Disclosure Schedule, there are no representations or
warranties of the Company or its Subsidiaries either expressed or implied with
respect to the Company, its Subsidiaries or their respective assets, liabilities
and businesses, and (ii) other than as incorporated, referred to or repeated in
the representations and warranties of the Company made in this Agreement or in
the Disclosure Schedule, it shall have no claim or right to indemnification with
respect to any information (whether written or oral), documents or material
furnished by the Company, its Subsidiaries or any of their respective officers,
directors, employees, agents or advisors to Parent, including any information,
documents or material made available to Parent in certain "data rooms,"
management presentations or any other form in expectation of the transactions
contemplated by this Agreement
 
    8.4  NOTICES.  All notices and other communications hereunder shall be in
writing and shall be deemed given when delivered personally by commercial
courier service or otherwise, or by telecopier, or three days after such notice
is mailed by registered or certified mail (return receipt requested) to the
parties at the following addresses (or at such other address for a party as
shall be specified by like notice):
 
        (a) if to Parent or Merger Subsidiary, to it at:
 
            Medtronic, Inc.
            7000 Central Avenue, N.E.
            Minneapolis, MN 55432
 
            with separate copies thereof addressed to
 
            Attention:  General Counsel
                        FAX: (612) 572-5459
 
            and
 
            Attention:  Vice President and Chief Development Officer
                        FAX: (612) 572-5404
 
        (b) If to the Company, to it at:
 
   
            AVECOR Cardiovascular Inc.
            7611 Northland Drive
            Minneapolis, MN 55428
            FAX: (612) 391-9020
            Attention: Anthony Badolato, CEO
    
 
                                      B-36
<PAGE>
            with a copy to:
 
            Oppenheimer Wolff & Donnelly LLP
            Plaza VII Building, Suite 3400
            45 South Seventh Street
            Minneapolis, MN 55402
            FAX: (612) 607-7100
            Attention: Richard Lareau
 
    8.5  ASSIGNMENT.  This Agreement and all of the provisions hereof shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns, but neither this Agreement nor any of the
rights, interests, or obligations hereunder shall be assigned by any of the
parties hereto without the prior written consent of the other parties, nor is
this Agreement intended to confer upon any other person except the parties
hereto any rights or remedies hereunder, except that Section 5.14 of this
Agreement shall inure to the benefit of the persons identified therein.
 
    8.6  GOVERNING LAW.  This Agreement shall be governed by, construed and
enforced in accordance with the laws of the State of Minnesota (regardless of
the laws that might otherwise govern under applicable Minnesota principles of
conflicts of law).
 
    8.7  COUNTERPARTS.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, and all of which
together shall constitute one and the same instrument.
 
    8.8  KNOWLEDGE.  As used in this Agreement or the instruments, certificates
or other documents required hereunder, the term "knowledge" of an entity shall
mean knowledge actually possessed by any director or officer of such entity.
 
    8.9  INTERPRETATION.  The Table of Contents, article and Section headings
contained in this Agreement are inserted for reference purposes only and shall
not affect the meaning or interpretation of this Agreement. This Agreement shall
be construed without regard to any presumption or other rule requiring the
resolution of any ambiguity regarding the interpretation or construction hereof
against the party causing this Agreement to be drafted.
 
    8.10  PUBLICITY.  Upon execution of this Agreement by Parent, Merger
Subsidiary, and the Company, the parties shall jointly issue a press release, as
agreed upon by them. The parties intend that all future statements or
communications to the public or press regarding this Agreement or the Merger
will be mutually agreed upon by them and neither party shall, without such
mutual agreement or the prior consent of the other, issue any statement or
communication to the public or to the press regarding this Agreement, or any of
the terms, conditions, or other matters with respect to this Agreement, except
as required by law or the rules of the NYSE or Nasdaq and then only (a) upon the
advice of such party's legal counsel; (b) to the extent required by law or the
rules of the NYSE or Nasdaq; and (c) following prior notice to the other party
and an opportunity for the other party to discuss with the disclosing party
(which notice shall include a copy of the proposed statement or communication to
be issued to the press or public). The foregoing shall not restrict Parent's or
the Company's communications with their employees or customers in the ordinary
course of business.
 
    8.11  ENTIRE AGREEMENT.  This Agreement, including the exhibits and
schedules hereto and the Confidentiality Agreement referred to herein, embodies
the entire agreement and understanding of the parties hereto in respect of the
subject matter contained herein. This Agreement and the Confidentiality
Agreement supersede all prior agreements and the understandings between the
parties with respect to such subject matter. No discussions regarding or
exchange of drafts or comments in connection with the transactions contemplated
herein shall constitute an agreement among the parties hereto. Any agreement
among the parties shall exist only when the parties have fully executed and
delivered this Agreement.
 
                                      B-37
<PAGE>
    IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.
 
   
<TABLE>
<S>                             <C>  <C>
                                MEDTRONIC, INC.
 
                                BY   /S/ MICHAEL D. ELLWEIN
                                     -----------------------------------------
                                     Its: Vice President
 
                                AC MERGER CORP.
 
                                BY   /S/ MICHAEL D. ELLWEIN
                                     -----------------------------------------
                                     Its: President
 
                                AVECOR CARDIOVASCULAR INC.
 
                                BY   /S/ ANTHONY BADOLATO
                                     -----------------------------------------
                                     Its: CEO
</TABLE>
    
 
                                      B-38
<PAGE>
                                   APPENDIX C
                       MINNESOTA BUSINESS CORPORATION ACT
 
302A.471. RIGHTS OF DISSENTING SHAREHOLDERS
 
    SUBDIVISION 1. ACTIONS CREATING RIGHTS.  A shareholder of a corporation may
dissent from, and obtain payment for the fair value of the shareholder's shares
in the event of, any of the following corporate actions:
 
    (a) An amendment of the articles that materially and adversely affects the
rights or preferences of the shares of the dissenting shareholder in that it:
 
        (1) alters or abolishes a preferential right of the shares;
 
        (2) creates, alters, or abolishes a right in respect of the redemption
    of the shares, including a provision respecting a sinking fund for the
    redemption or repurchase of the shares;
 
        (3) alters or abolishes a preemptive right of the holder of the shares
    to acquire shares, securities other than shares, or rights to purchase
    shares or securities other than shares;
 
        (4) excludes or limits the right of a shareholder to vote on a matter,
    or to cumulate votes, except as the right may be excluded or limited through
    the authorization or issuance of securities of an existing or new class or
    series with similar or different voting rights; except that an amendment to
    the articles of an issuing public corporation that provides that section
    302A.671 does not apply to a control share acquisition does not give rise to
    the right to obtain payment under this section;
 
    (b) A sale, lease, transfer, or other disposition of all or substantially
all of the property and assets of the corporation, but not including a
transaction permitted without shareholder approval in section 302A.661,
subdivision 1, or a disposition in dissolution described in section 302A.725,
subdivision 2, or a disposition pursuant to an order of a court, or a
disposition for cash on terms requiring that all or substantially all of the net
proceeds of disposition be distributed to the shareholders in accordance with
their respective interests within one year after the date of disposition;
 
    (c) A plan of merger, whether under this chapter or under chapter 322B, to
which the corporation is a party, except as provided in subdivision 3;
 
    (d) A plan of exchange, whether under this chapter or under chapter 322B, to
which the corporation is a party as the corporation whose shares will be
acquired by the acquiring corporation, if the shares of the shareholder are
entitled to vote on the plan; or
 
    (e) Any other corporate action taken pursuant to a shareholder vote with
respect to which the articles, the bylaws, or a resolution approved by the board
directs that dissenting shareholders may obtain payment for their shares.
 
    SUBD. 2. BENEFICIAL OWNERS.  (a) A shareholder shall not assert dissenters'
rights as to less than all of the shares registered in the name of the
shareholder, unless the shareholder dissents with respect to all the shares that
are beneficially owned by another person but registered in the name of the
shareholder and discloses the name and address of each beneficial owner on whose
behalf the shareholder dissents. In that event, the rights of the dissenter
shall be determined as if the shares as to which the shareholder has dissented
and the other shares were registered in the names of different shareholders.
 
    (b) The beneficial owner of shares who is not the shareholder may assert
dissenters' rights with respect to shares held on behalf of the beneficial
owner, and shall be treated as a dissenting shareholder under the terms of this
section and section 302A.473, if the beneficial owner submits to the corporation
at the time of or before the assertion of the rights a written consent of the
shareholder.
 
                                      C-1
<PAGE>
    SUBD. 3. RIGHTS NOT TO APPLY.  (a) Unless the articles, the bylaws, or a
resolution approved by the board otherwise provide, the right to obtain payment
under this section does not apply to a shareholder of the surviving corporation
in a merger, if the shares of the shareholder are not entitled to be voted on
the merger.
 
    (b) If a date is fixed according to section 302A.445, subdivision 1, for the
determination of shareholders entitled to receive notice of and to vote on an
action described in subdivision 1, only shareholders as of the date fixed, and
beneficial owners as of the date fixed who hold through shareholders, as
provided in subdivision 2, may exercise dissenters' rights.
 
    SUBD. 4. OTHER RIGHTS.  The shareholders of a corporation who have a right
under this section to obtain payment for their shares do not have a right at law
or in equity to have a corporate action described in subdivision 1 set aside or
rescinded, except when the corporate action is fraudulent with regard to the
complaining shareholder or the corporation.
 
302A.473. PROCEDURES FOR ASSERTING DISSENTERS' RIGHTS
 
    SUBDIVISION 1. DEFINITIONS.  (a) For purposes of this section, the terms
defined in this subdivision have the meanings given them.
 
    (b) "Corporation" means the issuer of the shares held by a dissenter before
the corporate action referred to in section 302A.471, subdivision 1 or the
successor by merger of that issuer.
 
    (c) "Fair value of the shares" means the value of the shares of a
corporation immediately before the effective date of the corporate action
referred to in section 302A.471, subdivision 1.
 
    (d) "Interest" means interest commencing five days after the effective date
of the corporate action referred to in section 302A.471, subdivision 1, up to
and including the date of payment, calculated at the rate provided in section
549.09 for interest on verdicts and judgments.
 
    SUBD. 2. NOTICE OF ACTION.  If a corporation calls a shareholder meeting at
which any action described in section 302A.471, subdivision 1 is to be voted
upon, the notice of the meeting shall inform each shareholder of the right to
dissent and shall include a copy of section 302A.471 and this section and a
brief description of the procedure to be followed under these sections.
 
    SUBD. 3. NOTICE OF DISSENT.  If the proposed action must be approved by the
shareholders, a shareholder who wishes to exercise dissenters' rights must file
with the corporation before the vote on the proposed action a written notice of
intent to demand the fair value of the shares owned by the shareholder and must
not vote the shares in favor of the proposed action.
 
    SUBD. 4. NOTICE OF PROCEDURE; DEPOSIT OF SHARES.  (a) After the proposed
action has been approved by the board and, if necessary, the shareholders, the
corporation shall send to all shareholders who have complied with subdivision 3
and to all shareholders entitled to dissent if no shareholder vote was required,
a notice that contains:
 
        (1) The address to which a demand for payment and certificates of
    certificated shares must be sent in order to obtain payment and the date by
    which they must be received;
 
        (2) Any restrictions on transfer of uncertificated shares that will
    apply after the demand for payment is received;
 
        (3) A form to be used to certify the date on which the shareholder, or
    the beneficial owner on whose behalf the shareholder dissents, acquired the
    shares or an interest in them and to demand payment; and
 
        (4) A copy of section 302A.471 and this section and a brief description
    of the procedures to be followed under these sections.
 
                                      C-2
<PAGE>
    (b) In order to receive the fair value of the shares, a dissenting
shareholder must demand payment and deposit certificated shares or comply with
any restrictions on transfer of uncertificated shares within 30 days after the
notice required by paragraph (a) was given, but the dissenter retains all other
rights of a shareholder until the proposed action takes effect.
 
    SUBD. 5. PAYMENT; RETURN OF SHARES.  (a) After the corporate action takes
effect, or after the corporation receives a valid demand for payment, whichever
is later, the corporation shall remit to each dissenting shareholder who has
complied with subdivisions 3 and 4 the amount the corporation estimates to be
the fair value of the shares, plus interest, accompanied by:
 
        (1) The corporation's closing balance sheet and statement of income for
    a fiscal year ending not more than 16 months before the effective date of
    the corporate action, together with the latest available interim financial
    statements;
 
        (2) An estimate by the corporation of the fair value of the shares and a
    brief description of the method used to reach the estimate; and
 
        (3) A copy of section 302A.471 and this section, and a brief description
    of the procedure to be followed in demanding supplemental payment.
 
    (b) The corporation may withhold the remittance described in paragraph (a)
from a person who was not a shareholder on the date the action dissented from
was first announced to the public or who is dissenting on behalf of a person who
was not a beneficial owner on that date. If the dissenter has complied with
subdivisions 3 and 4, the corporation shall forward to the dissenter the
materials described in paragraph (a), a statement of the reason for withholding
the remittance, and an offer to pay to the dissenter the amount listed in the
materials if the dissenter agrees to accept that amount in full satisfaction.
The dissenter may decline the offer and demand payment under subdivision 6.
Failure to do so entitles the dissenter only to the amount offered. If the
dissenter makes demand, subdivisions 7 and 8 apply.
 
    (c) If the corporation fails to remit payment within 60 days of the deposit
of certificates or the imposition of transfer restrictions on uncertificated
shares, it shall return all deposited certificates and cancel all transfer
restrictions. However, the corporation may again give notice under subdivision 4
and require deposit or restrict transfer at a later time.
 
    SUBD. 6. SUPPLEMENTAL PAYMENT; DEMAND.  If a dissenter believes that the
amount remitted under subdivision 5 is less than the fair value of the shares
plus interest, the dissenter may give written notice to the corporation of the
dissenter's own estimate of the fair value of the shares, plus interest, within
30 days after the corporation mails the remittance under subdivision 5, and
demand payment of the difference. Otherwise, a dissenter is entitled only to the
amount remitted by the corporation.
 
    SUBD. 7. PETITION; DETERMINATION.  If the corporation receives a demand
under subdivision 6, it shall, within 60 days after receiving the demand, either
pay to the dissenter the amount demanded or agreed to by the dissenter after
discussion with the corporation or file in court a petition requesting that the
court determine the fair value of the shares, plus interest. The petition shall
be filed in the county in which the registered office of the corporation is
located, except that a surviving foreign corporation that receives a demand
relating to the shares of a constituent domestic corporation shall file the
petition in the county in this state in which the last registered office of the
constituent corporation was located. The petition shall name as parties all
dissenters who have demanded payment under subdivision 6 and who have not
reached agreement with the corporation. The corporation shall, after filing the
petition, serve all parties with a summons and copy of the petition under the
rules of civil procedure. Nonresidents of this state may be served by registered
or certified mail or by publication as provided by law. Except as otherwise
provided, the rules of civil procedure apply to this proceeding. The
jurisdiction of the court is plenary and exclusive. The court may appoint
appraisers, with powers and authorities the court deems proper, to receive
evidence on and recommend the amount of the fair value of the shares. The court
shall determine whether the
 
                                      C-3
<PAGE>
shareholder or shareholders in question have fully complied with the
requirements of this section, and shall determine the fair value of the shares,
taking into account any and all factors the court finds relevant, computed by
any method or combination of methods that the court, in its discretion, sees fit
to use, whether or not used by the corporation or by a dissenter. The fair value
of the shares as determined by the court is binding on all shareholders,
wherever located. A dissenter is entitled to judgment in cash for the amount by
which the fair value of the shares as determined by the court, plus interest,
exceeds the amount, if any, remitted under subdivision 5, but shall not be
liable to the corporation for the amount, if any, by which the amount, if any,
remitted to the dissenter under subdivision 5 exceeds the fair value of the
shares as determined by the court, plus interest.
 
    SUBD. 8. COSTS; FEES; EXPENSES.  (a) The court shall determine the costs and
expenses of a proceeding under subdivision 7, including the reasonable expenses
and compensation of any appraisers appointed by the court, and shall assess
those costs and expenses against the corporation, except that the court may
assess part or all of those costs and expenses against a dissenter whose action
in demanding payment under subdivision 6 is found to be arbitrary, vexatious, or
not in good faith.
 
    (b) If the court finds that the corporation has failed to comply
substantially with this section, the court may assess all fees and expenses of
any experts or attorneys as the court deems equitable. These fees and expenses
may also be assessed against a person who has acted arbitrarily, vexatiously, or
not in good faith in bringing the proceeding, and may be awarded to a party
injured by those actions.
 
    (c) The court may award, in its discretion, fees and expenses to an attorney
for the dissenters out of the amount awarded to the dissenters, if any.
 
                                      C-4
<PAGE>
                                   APPENDIX D
 
                                                                    [LETTERHEAD]
 
July 12, 1998
 
The Board of Directors
AVECOR Cardiovascular Inc.
7611 Northland Drive
Minneapolis, MN 55428
 
Members of the Board:
 
    In connection with the proposed transaction ("Transaction") in which
Medtronic Merger Corporation, a wholly-owned subsidiary of Medtronic, Inc.
("Medtronic"), will be merged with and into AVECOR Cardiovascular Inc.
("AVECOR") and AVECOR will become a wholly-owned subsidiary of Medtronic, you
have requested our opinion as to the fairness, from a financial point of view,
to the shareholders of AVECOR of the proposed consideration to be received by
the shareholders of AVECOR in the Transaction pursuant to the Agreement referred
to below. Under the terms of the Agreement and Plan of Merger (the "Agreement"),
at the effective time of the Transaction, each issued and outstanding share of
AVECOR Common Stock will be converted into the fraction of a share of Medtronic
common stock which is equivalent to $11.125 per share based upon the average of
the daily closing stock price of Medtronic for the 18 consecutive trading days
ending on and including the second trading day immediately preceding the
closing. The terms and conditions of the Merger are more fully set forth in the
Agreement. The Transaction is intended to qualify as a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the
"Code").
 
    Piper Jaffray Inc., as a customary part of its investment banking business,
is engaged in the valuation of businesses and their securities in connection
with mergers and acquisitions, underwriting and secondary distributions of
securities, private placements and valuations for estate, corporate and other
purposes. We have acted as exclusive financial advisor to AVECOR in connection
with the Transaction and will receive a fee for our services which is contingent
upon consummation of the Transaction. In addition, we will receive a separate
fee for providing this opinion, which will be credited against the fee for our
services. This opinion fee is not contingent upon the consummation of the
Transaction. AVECOR has also agreed to indemnify us against certain liabilities
in connection with our services. We acted as lead manager of a public stock
offering of AVECOR Common Stock on June 21, 1995. In the ordinary course of our
business, we and our affiliates may actively trade securities of Medtronic and
AVECOR for our own account or the account of our customers and, accordingly, may
at any time hold a long or short position in such securities.
 
    In arriving at our opinion, we have undertaken such review, analyses and
inquiries as we deemed necessary and appropriate under the circumstances. Among
other things, we have reviewed (i) a draft dated July 10, 1998 of the Agreement
and Plan of Merger, (ii) certain public information related to Medtronic, (iii)
certain publicly available financial and securities data of Medtronic and
selected public companies deemed comparable to Medtronic, (iv) certain analyst
reports on Medtronic, (v) to the extent publicly available, information
concerning selected transactions deemed comparable to the proposed Transaction ,
(vi) certain publicly available information relative to AVECOR and selected
public companies deemed comparable to AVECOR, (vii) certain internal financial
information of AVECOR on a stand-alone basis prepared for financial planning
purposes, and furnished by AVECOR management and (viii) certain publicly
available financial and securities data of AVECOR. We had discussions with
members of the management of AVECOR concerning the financial condition, current
operating results and business outlook for AVECOR on a stand-alone basis.
 
                                      D-1
<PAGE>
    We have relied upon and assumed the accuracy, completeness and fairness of
the financial statements and other information provided to us by AVECOR, or
otherwise made available to us, and have not assumed responsibility for the
independent verification of such information. AVECOR has advised us that it does
not publicly disclose internal financial information of the type provided to us
and that such information was prepared for financial planning purposes and not
with the expectation of public disclosure. We have relied upon the assurance of
the management of AVECOR that the information provided to us by AVECOR has been
prepared on a reasonable basis, and, with respect to financial planning data and
other business outlook information, reflects the best currently available
estimates, and that they are not aware of any information or facts that would
make the information provided to us incomplete or misleading.
 
    We have assumed that the final form of the Agreement will be substantially
similar to the last draft reviewed by us, without modification of material terms
or conditions by AVECOR or Medtronic. We have also assumed that the Transaction
contemplated by the Agreement will constitute a "reorganization" within the
meaning of Section 368(a) of the Code. In addition, we have assumed that, in the
course of obtaining the necessary regulatory approvals for the Transaction, no
restrictions, including any divestiture requirements, will be imposed that will
have a material adverse effect on the contemplated benefits of the Transaction.
 
    In arriving at our opinion, we have not performed any appraisals or
valuations of any specific assets or liabilities of AVECOR or Medtronic, and
have not been furnished with any such appraisals or valuations. We express no
opinion regarding the liquidation value of any entity.
 
    This opinion is necessarily based upon the information available to us and
facts and circumstances as they exist and are subject to evaluation on the date
hereof; events occurring after the date hereof could materially affect the
assumptions used in preparing this opinion. We are not expressing any opinion
herein as to the price at which shares of AVECOR or Medtronic Common Stock have
traded or may trade at any future time. We have not undertaken to reaffirm or
revise this opinion or otherwise comment upon any events occurring after the
date hereof and do not have any obligation to update, revise or reaffirm this
opinion.
 
    This opinion is directed to and is for the use and benefit of the Board of
Directors of AVECOR and is rendered to the Board of Directors in connection with
its consideration of the Transaction. This opinion is not intended to be and
does not constitute a recommendation to any shareholder as to how such
shareholder should vote with respect to the Transaction. We were not requested
to opine as to, and this opinion does not address, the basic business decision
to proceed with or effect the Transaction. This opinion shall not be published
or otherwise used, nor shall any public references to us be made, without our
prior written approval.
 
    Based upon and subject to the foregoing and based upon such other factors as
we consider relevant, it is our opinion that the consideration proposed to be
received by the shareholders of AVECOR in the Transaction pursuant to the
Agreement is fair, from a financial point of view, to the shareholders of AVECOR
as of the date hereof.
 
Sincerely,
 
   
/s/ Piper Jaffray Inc.
PIPER JAFFRAY INC.
    
 
                                      D-2
<PAGE>

                                      PART II
                                          
                       INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Minnesota Statutes Section 302A.521, Subd. 2, requires Medtronic to 
indemnify a person made or threatened to be made a party to a proceeding by 
reason of the former or present official capacity of the person with respect 
to Medtronic, against judgments, penalties, fines, settlements, and 
reasonable expenses, including attorneys' fees and disbursements, incurred by 
the person in connection with the proceeding if certain statutory standards 
are met.  In addition, Section 302A.521, Subd. 3, requires payment by 
Medtronic, upon written request, of reasonable expenses in advance of final 
disposition of the proceeding in certain circumstances.  A decision as to 
required indemnification is made by a disinterested majority of the Board of 
Directors present at a meeting at which a disinterested quorum is present, or 
by a designated committee of the Board, by special legal counsel, by the 
shareholders, or by a court. Section 302A.521 contains detailed terms 
regarding such right of indemnification and reference is made thereto for a 
complete statement of such indemnification rights.

     Medtronic's Bylaws provide for indemnification by Medtronic to the full 
extent permitted by Minnesota Statutes Section 302A.521, as now enacted or 
hereafter amended, against and with respect to threatened, pending, or 
completed actions, suits, or proceedings arising from, or alleged to arise 
from, a party's actions or omissions as a director, officer, employee, or 
agent of Medtronic or any subsidiary of Medtronic or of any other 
corporation, partnership, joint venture, trust, or other enterprise that has 
served in such capacity at the request of Medtronic if such acts or omissions 
occurred, or were or are alleged to have occurred, while such party was a 
director or officer of Medtronic. Generally, under Minnesota law, 
indemnification will be available only where an officer or director can 
establish that he or she acted in good faith and in a manner such person 
reasonably believed to be in or not opposed to the best interests of 
Medtronic.  As permitted by Minnesota Statutes Section 302A.521, Medtronic's 
Restated Articles of Incorporation provide that a director shall have no 
personal liability to Medtronic or its shareholders for breach of his or her 
fiduciary duty as a director, to the fullest extent permitted by law.

     In addition to providing indemnification as outlined above, Medtronic 
also purchases individual insurance coverage for its directors and officers.  
Subject to the stated conditions, the policy insures the directors and 
officers of Medtronic against liability arising out of actions taken in their 
official capacities.  To the extent that such actions cannot be indemnified 
by Medtronic, the policy provides individual liability insurance protection 
for the directors and officers of Medtronic. 

Item 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

   
<TABLE>
<S>         <C>
     (a)    Exhibits

     2*     Agreement and Plan of Merger, dated July 12, 1998, by and among
            Medtronic, Inc., AVECOR Cardiovascular Inc., and AC Merger Corp.,
            including the Exhibits thereto. (The Agreement and Plan of Merger
            and Exhibit A thereto are furnished as Appendices B and A,
            respectively, to the Proxy Statement/Prospectus forming a part of
            this Registration Statement.)  Upon the request of the Commission,
            Medtronic agrees to furnish supplementally to the Commission a copy
            of any disclosure schedules to the Agreement and Plan of Merger.
</TABLE>
    

                                       II-1

<PAGE>

   
<TABLE>
<S>         <C>
     5**    Opinion and Consent of Fredrikson & Byron, P.A. regarding validity
            of shares.

     8**    Opinion and Consent of Oppenheimer Wolff & Donnelly LLP
            regarding certain tax matters.

     23.1** Consent of Fredrikson & Byron, P.A. (included in Exhibit 5).

     23.2** Consent of Oppenheimer Wolff & Donnelly LLP regarding certain tax
            matters (included in Exhibit 8).

     23.3** Consent of PricewaterhouseCoopers LLP, independent accountants for
            Medtronic, Inc. 

     23.4** Consent of PricewaterhouseCoopers LLP, independent accountants for
            AVECOR Cardiovascular Inc.

     23.5*  Consent of Piper Jaffray Inc.

     24*    Power of Attorney.

     99.1** Form of Proxy to be used by AVECOR Cardiovascular Inc.
            shareholders.

     (b)    Financial Statement Schedules.

            Not applicable.

     (c)    Reports, Opinions and Appraisals Materially Related to the
            Transaction.

            Opinion of Piper Jaffray Inc. is furnished as Appendix D to the
            Proxy Statement/Prospectus forming a part of this Registration
            Statement.
</TABLE>
    
     ---------
   
     * Filed with the Registration Statement to which this Pre-Effective 
       Amendment No. 1 relates.
    ** Filed herewith.
    

Item 22. UNDERTAKINGS.

     (a)    The undersigned registrant hereby undertakes that, for purposes 
of determining any liability under the Securities Act of 1933, each filing of 
the registrant's annual report pursuant to Section 13(a) or Section 15(d) of 
the Securities Exchange Act of 1934 (and, where applicable, each filing of an 
employee benefit plan's annual report pursuant to Section 15(d) of the 
Securities Exchange Act of 1934) that is incorporated by reference in the 
registration statement 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.

     (b)    (i)     The undersigned registrant hereby undertakes as follows: 
that prior to any public reoffering of the securities registered hereunder 
through use of a prospectus which is a part of this registration statement, 
by any person or party who is deemed to be an underwriter within the meaning 
of Rule 145(c), the issuer undertakes that such reoffering prospectus will 
contain the information called for by the applicable registration form with 
respect to reofferings by persons who may be deemed underwriters, in addition 
to the information called for by the other Items of the applicable form.

                                       II-2

<PAGE>

            (ii)    The registrant undertakes that every prospectus [a] that 
is filed pursuant to paragraph (b)(i) immediately preceding, or [b] that 
purports to meet the requirements of Section 10(a)(3) of the Securities Act 
and is used in connection with an offering of securities subject to Rule 415, 
will be filed as a part of an amendment to the registration statement and 
will not be used until such amendment is effective, and that, for purposes of 
determining any liability under the Securities Act of 1933, 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.

     (c)    Insofar as indemnification for liabilities arising under the 
Securities Act of 1933 may be permitted to directors, officers and 
controlling persons of the registrant pursuant to the foregoing provisions, 
or otherwise, the registrant has been advised that in the opinion of the 
Securities and Exchange Commission such indemnification is against public 
policy as expressed in the Securities Act and is, therefore, unenforceable.  
In the event that a claim for indemnification against such liabilities (other 
than the payment by the registrant of expenses incurred or paid by a 
director, officer or controlling person of the registrant 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 registrant 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 whether such indemnification by it is 
against public policy as expressed in the Securities Act and will be governed 
by the final adjudication of such issue.

     (d)    The undersigned registrant hereby undertakes to respond to 
requests for information that is incorporated by reference into the 
prospectus pursuant to Items 4, 10(b), 11, or 13 of this Form, within one 
business day of receipt of such request, and to send the incorporated 
documents by first class mail or other equally prompt means.  This includes 
information contained in documents filed subsequent to the effective date of 
the registration statement through the date of responding to the request.

     (e)    The undersigned registrant hereby undertakes to supply by means 
of a post-effective amendment all information concerning a transaction, and 
the company being acquired involved therein, that was not the subject of and 
included in the registration statement when it became effective.

                                       II-3

<PAGE>

   
                                     SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the 
Registrant has duly caused this Pre-Effective Amendment No. 1 to the 
Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Minneapolis, State of Minnesota, 
on September 23, 1998.
    
                                   MEDTRONIC, INC.


                                   By /s/ William W. George           
                                      -----------------------------------
                                       William W. George, Chairman
                                        and Chief Executive Officer


                                       II-4

<PAGE>

   
     Pursuant to the requirements of the Securities Act of 1933, this 
Pre-Effective Amendment No. 1 to the Registration Statement has been signed 
on September 23, 1998 by the following persons in the capacities indicated.
    
   
<TABLE>
<CAPTION>
Signature                               Title
- ---------                               -----
<S>                                     <C>                                                  <C>
 /s/ William W. George                  Chairman, Chief Executive Officer and                September 23, 1998
- ---------------------------------       Director (principal executive officer)
William W. George               

 /s/ Robert L. Ryan                     Senior Vice President and Chief                      September 23, 1998
- ---------------------------------       Financial Officer (principal
Robert L. Ryan                          financial and accounting officer)

               *                        Vice Chairman and Director       )
- ---------------------------------                                        )
Glen D. Nelson, M.D.                                                     )
                                                                         )
               *                        Director                         )
- ---------------------------------                                        )
William R. Brody, M.D., Ph.D.                                            )
                                                                         )
               *                        Director                         )       * By /s/ Ronald E. Lund
- ---------------------------------                                        )           -------------------
Paul W. Chellgren                                                        )            Ronald E. Lund
                                                                         )            Attorney-in-Fact
               *                        Director                         )
- ---------------------------------                                        )
Arthur D. Collins, Jr.                                                   )            Date: September 23, 1998
                                                                         )
               *                        Director                         )
- ---------------------------------                                        )
Antonio M. Gotto, Jr., M.D.                                              )
                                                                         )
               *                        Director                         )
- ---------------------------------                                        )
Bernadine P. Healy, M.D.                                                 )
                                                                         )
               *                        Director                         )
- ---------------------------------                                        )
Thomas E. Holloran                                                       )
                                                                         )
               *                        Director                         )
- ---------------------------------                                        )
Richard L. Schall                                                        )
                                                                         )
                 *                      Director                         )
- ---------------------------------                                        )
Jack W. Schuler                                                          )
                                                                         )
                 *                      Director                         )
- ---------------------------------                                        )
Gerald W. Simonson                                                       )
                                                                         )
                 *                      Director                         )
- ---------------------------------                                        )
Gordon M. Sprenger                                                       )
                                                                         )
                 *                      Director                         )
- ---------------------------------                                        )
Richard A. Swalin, Ph.D.                                                 )


- ---------------------------------       Director
Jean-Pierre Rosso
</TABLE>
    

<PAGE>

                         SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C.  20549

                               ---------------------

                                   EXHIBIT INDEX
                                         TO
                          FORM S-4 REGISTRATION STATEMENT

                               ---------------------

- -------------------------------------------------------------------------------

                                  MEDTRONIC, INC.
     
- -------------------------------------------------------------------------------

   
<TABLE>
<CAPTION>
Exhibit     Description  
- -------     -----------
<S>         <C>
2*          Agreement and Plan of Merger, dated July 12, 1998, by and among
            Medtronic, Inc., AVECOR Cardiovascular Inc., and AC Merger Corp.,
            including the Exhibits thereto (The Agreement and Plan of Merger and
            Exhibit A thereto are furnished as Appendices B and A, respectively, to
            the Proxy Statement/Prospectus forming a part of this Registration
            Statement)
          
5           Opinion and Consent of Fredrikson & Byron, P.A. regarding validity of 
            shares
          
8           Opinion and Consent of Oppenheimer Wolff & Donnelly LLP regarding 
            certain tax matters
          
23.1        Consent of Fredrikson & Byron, P.A. (included in Exhibit 5)
          
23.2        Consent of Oppenheimer Wolff & Donnelly LLP regarding certain tax
            matters (included in Exhibit 8)
          
23.3        Consent of PricewaterhouseCoopers LLP, independent accountants for Medtronic, Inc.
          
23.4        Consent of PricewaterhouseCoopers LLP, independent accountants for AVECOR Cardiovascular Inc.
          
23.5*       Consent of Piper Jaffray Inc. 
          
24*         Power of Attorney of certain officers and directors
          
99.1        Form of Proxy to be used by AVECOR Cardiovascular Inc. shareholders
</TABLE>
    
   
     ---------
     * Previously filed.
    



<PAGE>
                                                                 Exhibit 5
                              FREDRIKSON & BYRON, P.A.
                                  ATTORNEYS AT LAW
                             1100 International Centre
                              900 Second Avenue South
                            Minneapolis, MN  55402-3397
                                   (612) 347-7000
                                FAX: (612) 347-7077

   
                                September 23, 1998
    

Medtronic, Inc.
7000 Central Avenue N.E.
Minneapolis, Minnesota  55432

Re:  REGISTRATION STATEMENT ON FORM S-4

Ladies/Gentlemen:

   
          We are acting as counsel for Medtronic, Inc. (the "Company"), a 
Minnesota corporation, in connection with the registration by the Company of 
1,638,387 shares of the Company's Common Stock, par value $.10 (the 
"Shares"), each of which shares includes the Preferred Stock Purchase Rights 
attached thereto (the "Rights"), pursuant to the Company's Pre-Effective 
Amendment No. 1 to the Registration Statement on Form S-4 being filed with 
the Securities and Commission (the "Registration Statement").  The Shares and 
the Rights are to be issued in connection with the merger of AC Merger Corp. 
("Merger Subsidiary"), a wholly-owned subsidiary of the Company, with and 
into AVECOR Cardiovascular Inc. ("AVECOR"), pursuant to the Agreement and 
Plan of Merger dated as of July 12, 1998 by and among the Company, Merger 
Subsidiary, and AVECOR (the "Merger Agreement").
    
     
          In connection with rendering this opinion, we have examined and 
relied upon originals or copies, certified or otherwise identified to our 
satisfaction, of such corporate records, agreements and other instruments, 
certificates of officers, certificates of public officials and other 
documents as we have deemed necessary or appropriate as a basis for the 
opinions expressed herein.
     
          In connection with our examination, we have assumed the genuineness 
of all signatures, the authenticity of all documents tendered to us as 
originals, the legal capacity of all natural persons and the conformity to 
original documents of all documents submitted to us as certified or 
photostatic copies.
     
          Based on, and subject to, the foregoing, it is our opinion that:
     
          1.  The Company has the corporate authority to issue the Shares and 
the Rights in the manner and under the terms set forth in the Registration 
Statement.
     
          2.  The Shares have been duly authorized and, when issued and 
delivered to holders of AVECOR common stock in accordance with the Merger 
Agreement, will be validly issued, fully paid and nonassessable.
     
          3.  The Rights have been duly authorized and, when issued and 
delivered in accordance with the Shareholder Rights Plan referred to in the 
Registration Statement, will be validly issued, fully paid and nonassessable.

<PAGE>
     
   
          We hereby consent to the filing of this opinion as Exhibit 5 to the 
Pre-Effective Amendment No. 1 to the Registration Statement, to its use as a 
part of the Registration Statement and to the use of our name under the 
caption "Legal Matters" in the Proxy Statement/Prospectus constituting a part 
of the Registration Statement.
    
     
                                       Very truly yours,
     
                                       /s/ Fredrikson & Byron, P.A.
     
                                       FREDRIKSON & BYRON, P.A.


<PAGE>
                                                                 Exhibit 8

   
                        OPPENHEIMER WOLFF & DONNELLY LLP
                                  Plaza VII
                           45 South Seventh Street
                                  Suite 3400
                        Minneapolis, Minnesota 55402-1609
                                (612) 607-7000
                              Fax (612) 607-7100
    
   
                              September 23, 1998
    

AVECOR Cardiovascular Inc.
7611 Northland Drive
Minneapolis, Minnesota 55428

Ladies and Gentlemen:

We are acting as your counsel in connection with the proposed acquisition by 
Medtronic, Inc. ("Medtronic") of AVECOR Cardiovascular Inc. ("AVECOR") 
pursuant to the proposed merger (the "Merger") of AC Merger Corp., a 
wholly-owned subsidiary of Medtronic ("Merger Subsidiary"), into AVECOR, with 
AVECOR surviving the Merger.  The Merger will be consummated pursuant to the 
Agreement and Plan of Merger by and among Medtronic, Merger Subsidiary and 
AVECOR dated July 12, 1998 (the "Merger Agreement").

   
Medtronic has filed with the Securities and Exchange Commission under the 
Securities Act of 1933, as amended (the "1933 Act"), a Pre-Effective 
Amendment No. 1 to the Registration Statement on Form S-4 (the "Registration 
Statement") with respect to the common stock of Medtronic to be issued to the 
holders of shares of common stock of AVECOR in connection with the Merger.  
In addition, Medtronic has prepared, and we have reviewed, a Proxy 
Statement/Prospectus which is contained in and made a part of the 
Registration Statement (the "Proxy Statement"), and the Appendices and 
Exhibits thereto, including the Merger Agreement.  In rendering the opinion 
set forth below, we have relied upon the facts stated in the Proxy Statement 
and upon such other documents as we have deemed appropriate, including the 
representations of Medtronic and AVECOR referred to in the Proxy Statement 
and set forth in certain tax representation letters from Medtronic and AVECOR.
    

We have assumed that all parties to the Merger Agreement have acted, and will 
act, in accordance with the terms of such Merger Agreement and that the 
Merger Agreement will be consummated at the effective time pursuant to the 
terms and conditions set forth in the Merger Agreement without the waiver or 
modification of any such terms and conditions.

   
Based upon and subject to the foregoing, and to the qualifications, 
limitations, representations and assumptions contained in the portion of the 
Proxy Statement captioned "The Merger--Certain Federal Income Tax 
Consequences," and in certain tax representation letters from Medtronic and 
AVECOR, and the further assumption that any post-Merger open market purchases 
by Medtronic of Medtronic Common Stock will not violate the "continuity of 
interest" requirements of Section 1.368-1(e) of the Treasury Regulations with 
respect to the Merger, it is our opinion that the portion of the Proxy 
Statement captioned "The Merger--Certain Federal Income Tax Consequences" 
describes the principal federal income tax consequences of the Merger to 
Medtronic, Merger Subsidiary, AVECOR and the holders of outstanding AVECOR 
common stock.  No opinion is expressed on any matters other than those 
specifically referred to herein.
    

This opinion is furnished to you for use in connection with the Registration 
Statement and may not be used for any other purpose without our prior express 
written consent.  We hereby consent to the filing of this opinion as an 
exhibit to the Registration Statement and to the use of our name in that 
portion of the Proxy Statement captioned "The Merger--Certain Federal Income 
Tax Consequences." In giving such 

<PAGE>

consent, we do not thereby admit that we are in the category of persons whose 
consent is required under Section 7 of the 1933 Act.

                                       Very truly yours,

   
                                       /s/ Oppenheimer Wolff & Donnelly LLP
    


<PAGE>
                                                                 Exhibit 23.3
   
                       CONSENT OF INDEPENDENT ACCOUNTANTS
    

   
We hereby consent to the incorporation by reference in the Proxy 
Statement/Prospectus constituting part of this Amendment No. 1 to the 
Registration Statement on Form S-4 of Medtronic, Inc. of our report dated May 
26, 1998, which appears on page 5 of Medtronic's 1998 Annual Report--Financial
Review, which is incorporated by reference in its Annual Report on Form 10-K 
for the year ended April 30, 1998. We also consent to the incorporation by 
reference of our report on the Financial Statement Schedule, which appears on 
page 13 of such Annual Report on Form 10-K. We also consent to the reference 
to us under the heading "Experts" in the Proxy Statement/Prospectus.
    

/s/ PricewaterhouseCoopers LLP
     
PRICEWATERHOUSECOOPERS LLP

   
Minneapolis, Minnesota
September 22, 1998
    


<PAGE>
                                                                 Exhibit 23.4
     
                       CONSENT OF PRICEWATERHOUSECOOPERS LLP

   
We consent to the inclusion or incorporation by reference in this Amendment 
No. 1 to Registration Statement on Form S-4 of Medtronic, Inc. of our reports 
dated March 16, 1998 on our audits of the consolidated financial statements 
and related financial statement schedule of AVECOR Cardiovascular Inc.  We 
also consent to the references to our firm under the caption "Experts" in 
this Amendment No. 1 to Registration Statement on Form S-4.
    

/s/ PricewaterhouseCoopers LLP

PRICEWATERHOUSECOOPERS LLP

   
Minneapolis, Minnesota
September 23, 1998
    


<PAGE>
                                                                    EXHIBIT 99.1
                           AVECOR CARDIOVASCULAR INC.
                        SPECIAL MEETING OF SHAREHOLDERS
 
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS.
 
   
    The undersigned shareholder hereby appoints Anthony Badolato and Gregory J.
Melsen and each of them, as proxies, each with full power of substitution, and
hereby authorizes each of them to represent and to vote, as designated below,
all shares of common stock of AVECOR Cardiovascular Inc. held of record by the
undersigned as of September 23, 1998, at the Special Meeting of Shareholders to
be held on October 28, 1998, at 9:00 a.m., local time, at 7611 Northland Drive,
Minneapolis, Minnesota, and at any adjournment or adjournments thereof, upon the
following proposal:
    
 
    To approve the Plan of Merger and the Agreement and Plan of Merger providing
for the merger of AC Merger Corp. into AVECOR Cardiovascular Inc., with AVECOR
Cardiovascular Inc. to be the surviving corporation and a wholly-owned
subsidiary of Medtronic, Inc., copies of which Plan of Merger and Agreement and
Plan of Merger are attached as Appendices A and B to the Proxy
Statement/Prospectus for the Special Meeting.
 
            / /  FOR            / /  AGAINST            / /  ABSTAIN
 
   
    THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED AS SPECIFIED BY THE
SHAREHOLDER, BUT IF NO CHOICE IS SPECIFIED, THIS PROXY WILL BE VOTED FOR
APPROVAL OF THE PLAN OF MERGER AND THE AGREEMENT AND PLAN OF MERGER.
    
 
            (CONTINUED AND TO BE SIGNED AND DATED ON THE OTHER SIDE)
<PAGE>
    IMPORTANT: Please sign exactly as name or names appear on this Proxy. Joint
owners should each sign personally. When signing as attorney, executor,
administrator, trustee or guardian, please give your full title as such. When
signing as a corporation, partnership or other entity, please sign in the name
of the entity by an authorized person.
                                              Dated: ___________________________
                                              __________________________________
                                               (Please sign name exactly as it
                                                       appears hereon)
                                              __________________________________
                                              (Signature of joint owner, if any)
 
   
                                              PLEASE MARK, DATE, SIGN AND RETURN
                                              THIS PROXY IN THE ENCLOSED PROXY
                                              RETURN ENVELOPE, WHICH REQUIRES NO
                                              POSTAGE IF MAILED IN THE UNITED
                                              STATES. IF AN ENVELOPE IS NOT
                                              ENCLOSED OR HAS BEEN MISPLACED,
                                              PLEASE RETURN THIS COMPLETED PROXY
                                              TO NORWEST SHAREOWNER SERVICES,
                                              P.O. BOX 64859, ST. PAUL, MN
                                              55164-0859.
    


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