DIAMETRICS MEDICAL INC
SC 13D/A, 1998-08-14
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                  SCHEDULE 13D
                                 AMENDMENT NO. 1
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13D-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13D-2(a)

                            Diametrics Medical, Inc.
- ----------------------------------------------------------------------------
                                (Name of Issuer)

                          COMMON STOCK, par value $0.01
- ----------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  [252532 10 6]
- ----------------------------------------------------------------------------
                                  CUSIP Number

                             BCC Acquisition II LLC
                            c/o Bay City Capital LLC
                               750 Battery Street
                                    Suite 600
                         San Francisco, California 94111
                                 (415) 676-3830

                                 with a copy to:

                             Timothy G. Hoxie, Esq.
                         Heller Ehrman White & McAuliffe
                                 333 Bush Street
                         San Francisco, California 94104
                                 (415) 772-6052
- ----------------------------------------------------------------------------
                       (Name, address and telephone number
           of person authorized to receive notices and communications)

                                  August 4,1998
                              --------------------
                          (Date of Event which requires
                            filing of this statement)

If the filing person has previously filed a statement on Schedule 13G to 
report the acquisition that is the subject of this Schedule 13D, and is 
filing this statement because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check 
the following box: / /

                         (Continued on following pages)

                              (Page 1 of 15 Pages)
<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 2 of 15 pages
                                 AMENDMENT NO. 1
- ------------------------------------------------------------------------------

- ------------------------------------------------------------------------------
1)  NAMES OF REPORTING PERSONS                         BCC Acquisition II LLC

- ------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a) / /
                                                                 (b) /X/
- ------------------------------------------------------------------------------
3)  SEC USE ONLY

- ------------------------------------------------------------------------------
4)  SOURCE OF FUNDS                                               WC, AF

- ------------------------------------------------------------------------------
5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEM 2(d) or 2(e)
                                                                    / /
- ------------------------------------------------------------------------------
6)  CITIZENSHIP OR PLACE OF ORGANIZATION                         Delaware

- ------------------------------------------------------------------------------
NUMBER OF SHARES              (7) SOLE VOTING
 BENEFICIALLY OWNED                 POWER                          -0-
 BY EACH REPORTING           -------------------------------------------------
 PERSON WITH                  (8) SHARED VOTING
                                    POWER                 3,400,541 shares
                             -------------------------------------------------
                              (9) SOLE DISPOSITIVE
                                    POWER                          -0-
                             -------------------------------------------------
                             (10) SHARED DISPOSITIVE
                                    POWER                  3,400,541 shares
- ------------------------------------------------------------------------------
11)   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                           3,400,541 shares
- ------------------------------------------------------------------------------
12)        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
           CERTAIN SHARES
                                                                    / /
- ------------------------------------------------------------------------------
13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)            13.8%

- ------------------------------------------------------------------------------
14)  TYPE OF REPORTING PERSON                                       OO
- ------------------------------------------------------------------------------
<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 3 of 15 pages
                                 AMENDMENT NO. 1
- ------------------------------------------------------------------------------
1)  NAMES OF REPORTING PERSONS               The Bay City Capital Fund I, L.P.

- ------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a) / /
                                                                 (b) /X/
- ------------------------------------------------------------------------------
3)  SEC USE ONLY

- ------------------------------------------------------------------------------
4)  SOURCE OF FUNDS                                                WC, AF

- ------------------------------------------------------------------------------
5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEM 2(d) or 2(e)
                                                                    / /
- ------------------------------------------------------------------------------
6)  CITIZENSHIP OR PLACE OF ORGANIZATION                           Delaware
- ------------------------------------------------------------------------------
NUMBER OF SHARES              (7) SOLE VOTING
 BENEFICIALLY OWNED                 POWER                             -0-
 BY EACH REPORTING           -------------------------------------------------
 PERSON WITH                  (8) SHARED VOTING
                                    POWER                     3,400,541 shares
                             -------------------------------------------------
                              (9) SOLE DISPOSITIVE
                                    POWER                             -0-
                             -------------------------------------------------
                             (10) SHARED DISPOSITIVE
                                    POWER                     3,400,541 shares
- ------------------------------------------------------------------------------
11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                              3,400,541 shares
- ------------------------------------------------------------------------------
12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES
                                                                    / /
- ------------------------------------------------------------------------------
13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)       13.8%

- ------------------------------------------------------------------------------
14)  TYPE OF REPORTING PERSON                                   PN

- ------------------------------------------------------------------------------
<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 4 of 15 pages
                                 AMENDMENT NO. 1
- ------------------------------------------------------------------------------
1)  NAMES OF REPORTING PERSONS               Bay City Capital Management LLC

- ------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a) / /
                                                                 (b) /X/
- ------------------------------------------------------------------------------
3)  SEC USE ONLY

- ------------------------------------------------------------------------------
4)  SOURCE OF FUNDS                                                 AF

- ------------------------------------------------------------------------------
5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEM 2(d) or 2(e)
                                                                    / /
- ------------------------------------------------------------------------------
6)  CITIZENSHIP OR PLACE OF ORGANIZATION                           Delaware

- ------------------------------------------------------------------------------
NUMBER OF SHARES              (7) SOLE VOTING
 BENEFICIALLY OWNED                 POWER                            -0-
 BY EACH REPORTING           -------------------------------------------------
 PERSON WITH                  (8) SHARED VOTING
                                    POWER                    3,400,541 shares
                             -------------------------------------------------
                              (9) SOLE DISPOSITIVE
                                    POWER                            -0-
                             -------------------------------------------------
                             (10) SHARED DISPOSITIVE
                                    POWER                    3,400,541 shares
- ------------------------------------------------------------------------------
11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                             3,400,541 shares
- ------------------------------------------------------------------------------
12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES
                                                                    / /
- ------------------------------------------------------------------------------
13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)       13.8%

- ------------------------------------------------------------------------------
14)  TYPE OF REPORTING PERSON                                    OO
- ------------------------------------------------------------------------------
<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 5 of 15 pages
                                 AMENDMENT NO. 1
- ------------------------------------------------------------------------------
1)  NAMES OF REPORTING PERSONS               Bay City Capital LLC

- ------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a) / /
                                                                 (b) /X/
- ------------------------------------------------------------------------------
3)  SEC USE ONLY

- ------------------------------------------------------------------------------
4)  SOURCE OF FUNDS                                                AF

- ------------------------------------------------------------------------------
5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    PURSUANT TO ITEM 2(d) or 2(e)
                                                                    / /
- ------------------------------------------------------------------------------
6)  CITIZENSHIP OR PLACE OF ORGANIZATION                        Delaware

- ------------------------------------------------------------------------------
NUMBER OF SHARES              (7) SOLE VOTING
 BENEFICIALLY OWNED                 POWER                        -0-
 BY EACH REPORTING           -------------------------------------------------
 PERSON WITH                  (8) SHARED VOTING
                                    POWER                 3,400,541 shares
                             -------------------------------------------------
                              (9) SOLE DISPOSITIVE
                                    POWER                        -0-
                             -------------------------------------------------
                             (10) SHARED DISPOSITIVE
                                    POWER                  3,400,541 shares
- ------------------------------------------------------------------------------
11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                           3,400,541 shares
- ------------------------------------------------------------------------------
12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES
                                                                    / /
- ------------------------------------------------------------------------------
13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)       13.8%

- ------------------------------------------------------------------------------
14)  TYPE OF REPORTING PERSON                                    OO
- ------------------------------------------------------------------------------
<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 6 of 15 pages
                                 AMENDMENT NO. 1

                                  INTRODUCTION

           BCC Acquisition II LLC, a Delaware limited liability company ("BCC 
Acquisition"), hereby files this Amendment No. 1 (the "Amendment") to the 
Statement on Schedule 13D (the "Statement") on behalf of the Reporting 
Persons (as defined under Item 2 of the Statement) identified in the 
Statement pursuant to the Agreement with respect to Schedule 13D attached to 
the Statement as Exhibit 7(1). Defined terms not otherwise defined herein 
have the meanings ascribed thereto in the Statement.

           Pursuant to a Common Stock Purchase Agreement (the "Common Stock 
Purchase Agreement"), dated June 30, 1998, among Diametrics Medical, Inc., a 
Minnesota corporation (the "Issuer"), BCC Acquisition and certain other 
purchasers (named in the Common Stock Purchase Agreement attached to the 
Statement as Exhibit 7(2)), the Issuer agreed to issue 1,952,191 shares 
("Shares") of its common stock ("Common Stock") to BCC Acquisition and 
190,667 shares of Common Stock to certain other purchasers.

           Pursuant to the Common Stock Purchase Agreement, the Issuer also 
agreed to issue to BCC Acquisition a warrant or warrants ("Warrant" or 
"Warrants") to acquire, at any time and from time to time, 650,731 additional 
shares of Common Stock, and to issue to certain other purchasers a Warrant or 
Warrants to acquire 63,555 additional shares of Common Stock. The Warrant or 
Warrants would be issued in the form attached to the Statement as Exhibit 
7(3)).

           The purchase and sale transaction was conditioned upon BCC 
Acquisition arranging for a $7.3 million financing to enable the Issuer to 
repay an outstanding note to Howmedica, Inc. in the same principal amount. 
The terms of the financing are set forth in a note purchase agreement ("Note 
Purchase Agreement") that is an exhibit to the Common Stock Purchase 
Agreement and the notes to be issued pursuant thereto ("Notes"). A copy of 
the Note Purchase Agreement is attached to the Statement as Exhibit 7(4) and 
a copy of the form of Notes is attached to the

<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 7 of 15 pages
                                 AMENDMENT NO. 1

Statement as Exhibit 7(5). The terms of the Note Purchase Agreement include 
the rights of holders of the Notes to convert all or a portion of the 
obligations evidenced thereby at any time into the Issuer's Common Stock at a 
conversion price of $8.40 per share.

           The Note Purchase Agreement contemplated that BCC Acquisition 
would acquire Notes for $6.7 million and certain other purchasers listed on 
the schedule attached to the Note Purchase Agreement would acquire Notes for 
$600,000. If converted, in accordance with the proposed Note Purchase 
Agreement, BCC Acquisition would acquire an additional 797,619 shares of 
Common Stock.

           On August 4, 1998, BCC Acquisition and the Issuer closed the 
transactions contemplated by the Common Stock Purchase Agreement, the Warrant 
Agreement and the Note Purchase Agreement. Pursuant to those agreements, all 
of the following occurred at the Closing: (1) BCC Acquisition paid the cash 
purchase price of $13,665,337 and received from the Issuer 1,952,191 Shares 
and a Warrant to purchase 650,731 additional shares of Common Stock; (2) BCC 
Acquisition paid $6.7 million to, and received from, the Issuer, Convertible 
Senior Secured Fixed Rate Notes evidencing obligations of $6.7 million of 
original principal amount; (3) the Issuer repaid the outstanding Howmedica, 
Inc. note with the proceeds of the sale of the Notes to BCC Acquisition and 
certain other purchasers; and (4) the Issuer's board of directors appointed 
BCC Acquisition's nominee, David V. Milligan, as a director of the Issuer.

           The number of shares of Common Stock issued by the Issuer to BCC 
Acquisition constitutes approximately 8.4% (or approximately 10.9% if BCC 
Acquisition were to exercise all of its Warrants to acquire an additional 
650,731 shares of the Issuer's Common Stock) of the number of shares of the 
Issuer's Common Stock outstanding immediately after the Closing. If, 
immediately after the Closing, BCC Acquisition had converted all of the Note 
obligations into shares of the Issuer's Common Stock as provided in the Note 
Purchase Agreement, and had

<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 8 of 15 pages
                                 AMENDMENT NO. 1

exercised all of its Warrants, then the number of shares of Common Stock that 
would have been issued by the Issuer to BCC Acquisition (3,400,541 shares) 
would have constituted approximately 13.8% of the number of shares of the 
Issuer's Common Stock outstanding immediately following the Closing.

           Section 10.1 of the Common Stock Purchase Agreement provides that 
the Issuer will file a registration statement covering the Shares issued or 
issuable under the Common Stock Purchase Agreement, the Warrant Agreement, 
and the Note Purchase Agreement within 45 days after the Closing.

           Only those Items amended are reported herein.

           Item 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

           Item 3 is amended in its entirety by the following paragraphs:

           On August 4, 1998, BCC Acquisition and the Issuer closed the 
transactions contemplated by the Common Stock Purchase Agreement, the Warrant 
Agreement and the Note Purchase Agreement. Pursuant to those agreements, all 
of the following occurred at the Closing: (1) BCC Acquisition paid the cash 
purchase price of $13,665,337 and received from the Issuer 1,952,191 Shares 
and a Warrant to purchase 650,731 additional shares of Common Stock; (2) BCC 
Acquisition paid $6.7 million to, and received from, the Issuer Convertible 
Senior Secured Fixed Rate Notes evidencing obligations of $6.7 million of 
original principal amount; (3) the Issuer repaid the outstanding Howmedica, 
Inc. note with the proceeds of the sale of the Notes to BCC Acquisition and 
certain other purchasers; and (4) the Issuer's board of directors appointed 
BCC Acquisition's nominee, David V. Milligan, as a director of the Issuer.

<PAGE>

CUSIP NO. 252532 10 6                 13D                   Page 9 of 15 pages
                                 AMENDMENT NO. 1

           The number of shares of Common Stock issued by the Issuer to BCC 
Acquisition constitutes approximately 8.4% (or approximately 10.9% if BCC 
Acquisition were to exercise all of its Warrants to acquire an additional 
650,731 shares of the Issuer's Common Stock) of the number of shares of the 
Issuer's Common Stock outstanding immediately after the Closing. If, 
immediately after the Closing, BCC Acquisition had converted all of the Note 
obligations into shares of the Issuer's Common Stock as provided in the Note 
Purchase Agreement, and had exercised all of its Warrants, then the number of 
shares of Common Stock that would have been issued by the Issuer to BCC 
Acquisition (3,400,541 shares) would have constituted approximately 13.8% of 
the number of shares of the Issuer's Common Stock outstanding immediately 
following the Closing.

           The total funds required by BCC Acquisition to purchase the Common 
Stock and the Warrants, pursuant to the Common Stock Purchase Agreement, was 
$13,665,337. An additional $6,700,000 was required for purchase of the Notes. 
Therefore, the total funds required of BCC Acquisition at Closing was 
$20,365,337.

           Pursuant to the LLC Agreement for BCC Acquisition II LLC, attached 
to the Statement as Exhibit 7(6) and the First Amendment to the LLC Operating 
Agreement for BCC Acquisition II LLC, attached hereto as Exhibit 7(7), BCC 
contributed $10,000,000 to BCC Acquisition and BIG contributed $10,047,004. 
Under participation agreements entered into by BCC Acquisition with each of 
two Swiss entities, Banca della Svizzera Italiana and Banca del Gottardo, 
(collectively, "the Swiss Investors"), attached hereto as Exhibits 7(8) and 
7(9) respectively, the Swiss Investors provided $318,334.80 toward BCC 
Acquisition's purchase of the Notes.

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 10 of 15 pages
                                 AMENDMENT NO. 1

           Item 4.   PURPOSE OF TRANSACTION.

           Item 4 is amended by adding the following paragraph immediately 
prior to the next to last paragraph thereof:

           The Issuer's board of directors appointed BCC Acquisition's 
nominee, David V. Milligan, to serve as a member of the board commencing 
immediately after the Closing.

           Item 5. INTEREST IN SECURITIES OF THE ISSUER.

           Item 5, paragraphs (a) and (b), are amended and restated to read 
as follows:

           (a) and (b)

           The aggregate number of shares and percentage of Common Stock of 
the Issuer (based upon the representation of the Issuer in the Common Stock 
Purchase Agreement that it had 21,189,923 shares of Common Stock outstanding 
as of August 4, 1998 immediately prior to Closing) beneficially owned by each 
person named in Item 2 of the Statement, as well as the number of shares of 
Common Stock as to which such person is deemed to have sole power to vote or 
to direct the vote, shared power to vote or to direct the vote, sole power to 
dispose or to direct the disposition, or shared power to dispose or direct 
the disposition, is set forth in the following table.

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 11 of 15 pages
                                 AMENDMENT NO. 1

(This table shows the number of shares of Common Stock of the Issuer that 
were acquired upon purchase and payment pursuant to the Common Stock Purchase 
Agreement and Note Purchase Agreement, and includes the Warrant Shares that 
would be received upon complete exercise of any Warrant or Warrants and 
complete conversion of any Note or Notes.)

<TABLE>
<CAPTION>

Reporting Person            No. of Shares        Percentage           Power to Vote        Power to Dispose
                             Beneficially          of Class        Shared       Sole     Shared         Sole
                               Owned(1)
- ----------------            -------------        ----------        ---------    ----     ---------      ----
<S>                          <C>                   <C>             <C>          <C>      <C>            <C>
BCC Acquisition              3,400,541             13.8%           3,400,541             3,400,541
BCC                          3,400,541             13.8%           3,400,541             3,400,541
BCC Management               3,400,541             13.8%           3,400,541             3,400,541
BCC LLC                      3,400,541             13.8%           3,400,541             3,400,541
</TABLE>

           The information required by Item 5 with respect to persons with 
whom voting or dispositive power is shared is set forth in Item 2 of the 
Statement.

           The Reporting Persons have been advised that: (a) certain trusts
primarily for the benefit of the lineal descendants of Nicholas J. Pritzker,
deceased (the "RA Trusts") own indirect interests in each of BCC Acquisition,
BCC, BCC Management and BCC LLC; (b) as of August 4, 1998, the RA Trusts owned
indirectly 25,319 shares of common stock of the Issuer; (c) as of August 4,
1998, a limited liability company, the members of which are other trusts
primarily for the benefit of the lineal descendants of Nicholas J. Pritzker,
deceased ("Amarfour"), owned 1,789,100 shares of common stock of the Issuer; (d)
as of August 4, 1998, other trusts primarily for the benefit of the lineal
descendants Nicholas J. Pritzker, deceased (the "Hoinfad Trusts")

- --------

     (1) This filing shall not be deemed an admission that the Reporting 
Persons presently are, for purposes of Section 13 of the Act, Beneficial 
Owners of any shares that the Swiss Investors would be entitled to upon 
conversion of the Notes. Upon their election to convert their Participation 
in the Notes, the Swiss Investors would receive an aggregate of 37,897 shares.

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 12 of 15 pages
                                 AMENDMENT NO. 1

owned less than a 10% interest in AEOW 96, LLC ("AEOW"), which is a party to 
the Common Stock Purchase Agreement, and which owned 60,089 shares of common 
stock of the Issuer; (e) different individuals serve as trustees of the RA 
Trusts and the member trusts of Amarfour on the one hand and the Hoinfad 
Trusts on the other hand, and there is no overlap in trusteeships between the 
Hoinfad Trusts and the RA Trusts, but there is overlap in trusteeships 
between the RA Trusts and the member trusts of Amarfour; (f) none of the RA 
Trusts, the Hoinfad Trusts, Amarfour, AEOW or the Reporting Persons have any 
express or implied agreement to act together for the purpose of acquiring, 
holding, voting or disposing of the common stock or any other securities of 
the Issuer; and (g) the RA Trusts expressly disclaim (i) the existence of any 
group with any or all of Amarfour, the Hoinfad Trusts, AEOW or the Reporting 
Persons, and (ii) beneficial ownership of the shares of common stock 
currently or hereafter owned by any or all of Amarfour, the Hoinfad Trusts, 
AEOW or the Reporting Persons.

           A response to Item 5(c) is added as follows:

           Other than the closing of the transactions contemplated by the 
Common Stock Purchase Agreement, the Warrant Agreement and the Note Purchase 
Agreement which are described in this Amendment, there have been no 
transactions by the Reporting Persons in the Issuer's Common Stock since the 
date of the filing of the Statement.

           Item 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS 
                   WITH RESPECT TO SECURITIES OF THE ISSUER.

           Item 6 is amended by adding the following at the end thereof:

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 13 of 15 pages
                                 AMENDMENT NO. 1

           (d) FIRST AMENDMENT TO THE LLC OPERATING AGREEMENT.

           The First Amendment to the LLC Operating Agreement by and between 
BCC and BIG, provides that BCC's capital contribution and commitment will 
remain at $10,000,000 and that the aggregate capital contribution and 
commitment of BIG be increased from $9,047,004 to $10,047,004. The First 
Amendment to the LLC Operating Agreement is attached hereto as Exhibit 7(7).

           (e) SWISS PARTICIPATION AGREEMENTS.

           Pursuant to the two participation agreements, BCC Acquisition 
agreed to sell an undivided interest and participation in the Notes to the 
Swiss Investors on the terms and conditions set forth therein. The 
Participation Amount (as defined in the participation agreements attached 
hereto as Exhibits 7(8) and 7(9)) was equal to an aggregate purchase price of 
$318,334.80. At the Closing (as defined in Item 3 of this Amendment), the 
Swiss Investors, Banca della Svizzera Italiana and Banca del Gottardo, paid 
$159,171.60 and $159,163.20, respectively, to BCC Acquisition and received an 
undivided interest and participation in the Notes (as more fully described in 
Exhibits 7(8) and 7(9) attached hereto).

           Item 7. MATERIAL TO BE FILED AS EXHIBITS.

Exhibit 7(7).   First Amendment to the LLC Operating Agreement

Exhibit 7(8).   Participation Agreement by and between BCC Acquisition II and 
                Banca della Svizzera Italiana

Exhibit 7(9).   Participation Agreement by and between BCC Acquisition II and 
                Banca del Gottardo

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 14 of 15 pages
                                 AMENDMENT NO. 1

                                LIST OF EXHIBITS
<TABLE>
<CAPTION>
Exhibit No            Description                                             Page
- ----------            -----------                                             ----
<C>          <S>                                                              <C>
7(7)         First Amendment to the Limited Liability Operating 
             Agreement for BCC Acquisition II LLC

7(8)         Participation Agreement by and between BCC
             Acquisition II LLC and Banca della Svizzera
             Italiana.

7(9)         Participation Agreement by and between BCC Acquisition II LLC 
             and Banca del Gottardo.
</TABLE>

<PAGE>

CUSIP NO. 252532 10 6                 13D                  Page 15 of 15 pages
                                 AMENDMENT NO. 1

                                   SIGNATURE

           After reasonable inquiry and to the best of the undersigned's 
knowledge and belief, the undersigned certifies that the information set 
forth in this statement is true, complete and correct.

Dated: August __, 1998               
                        BCC Acquisition II LLC

                        By:       Its Manager
                                  The Bay City Capital Fund I, L.P.

                                  By:        Its General Partner
                                             Bay City Capital Management
                                             LLC

                        By:      /s/ Fred B. Craves
                            ---------------------------------------------
                        Its:      Manager




<PAGE>

                               FIRST AMENDMENT TO THE
                              LLC OPERATING AGREEMENT
                                        FOR
                               BCC ACQUISITION II LLC

     THIS FIRST AMENDMENT TO THE LLC OPERATING AGREEMENT ("First Amendment") 
is made and entered into as of July __, 1998, by and between The Bay City 
Capital Fund I, L.P. (the "MANAGER" and a "MEMBER") and Bay Investment Group, 
L.L.C. ("BIG", a "MEMBER" and, with the Manager, the "MEMBERS").  This First 
Amendment amends that certain LLC Operating Agreement, by and between the 
Manager and BIG dated as of June 30, 1998 (the "LLC OPERATING AGREEMENT").

                                      RECITAL

     The Manager and BIG desire to modify the capital commitment and capital 
contribution provisions of the LLC Operating Agreement.

                                     AGREEMENT

     Accordingly, the parties hereto agree as follows:

     1.1  SUBSECTION 2.1  CAPITAL COMMITMENT of the LLC Operating Agreement is 
amended in its entirety to read as follows:

          The Manager's aggregate capital commitment hereunder is 
     $10,000,000. BIG's aggregate capital commitment hereunder is $10,047,004.

     1.2  SUBSECTION 2.2  CAPITAL CONTRIBUTION of the LLC Operating Agreement 
is amended in its entirety to read as follows:

          Upon the request of the Manager for capital contributions, each of 
     the Members shall make capital contributions to the Company up to such 
     Member's aggregate capital commitment, provided that no Member shall be 
     obligated to make a capital contribution other than related to the 
     Common Stock Purchase Agreement dated June 30, 1998 between the Company 
     and Diametrics Medical, Inc., the Note Purchase Agreement referred to 
     therein and the transactions contemplated by either of such documents or 
     operating expenses of the Company.  All capital contributions shall be 
     made first by the Manager (up to $10,000,000 in the aggregate) and then 
     by BIG (up to $10,047,004 in the aggregate).

<PAGE>

     IN WITNESS WHEREOF, each of the Members of BCC ACQUISITION II LLC have 
executed this First Amendment, effective as of the date written above.

                                       THE BAY CITY CAPITAL FUND I, L.P.

                                       Address:  c/o Bay City Capital LLC
                                                 750 Battery Street, Suite 600
                                                 San Francisco, CA  94111

                                       By:  Bay City Capital Management LLC

                                       Its:  General Partner

                                       By:  /s/ Roger H. Salquist
                                            ------------------------------------
                                       Name:   Roger H. Salquist
                                       Title:  Managing Partner


                                       BAY INVESTMENT GROUP, L.L.C.

                                       Address:  200 West Madison Street
                                                 Suite 3800
                                                 Chicago, IL  60606

                                       By:  /s/ Thomas J. Pritzker
                                            ------------------------------------
                                       Name:   Thomas J. Pritzker
                                       Title:  Co-Trustee of R.A. Trust No. 25, 
                                               a general partner of R.A.
                                               Investment Group, a member of 
                                               Bay Investment Group, L.L.C.



                                       By:  /s/ Marshall E. Eisenberg
                                            ------------------------------------
                                       Name:   Marshall E. Eisenberg
                                       Title:  Co-Trustee of R.A. Trust No. 25, 
                                               a general partner of R.A.
                                               Investment Group, a member of 
                                               Bay Investment  Group, L.L.C.

                                       2

<PAGE>

                           PARTICIPATION AGREEMENT

                                                                 July __, 1998

Banca della Svizzera Italiana
via Peri, 23
6900 Lugano
Switzerland

Attn:  A. De Angelis
                    Re:  Diametrics Medical, Inc. Note or Notes
                         --------------------------------------

Ladies and Gentlemen:

     We refer to the Note Purchase Agreement to be executed at the Closing 
pursuant to the Common Stock Purchase Agreement dated June 30, 1998 between 
Diametrics Medical, Inc. (the "BORROWER") and certain signatories thereto 
identified as "Purchasers" (including us), a copy of which has been furnished 
to you.  That Note Purchase Agreement, as it may hereafter be amended or 
otherwise modified from time to time, is sometimes referred to in this 
participation agreement (the "PARTICIPATION AGREEMENT") as the "NPA" and the 
terms defined in the NPA and not otherwise defined in this Participation 
Agreement have the same meaning when used herein.

     Pursuant to the NPA, we intend to purchase a Note or Notes from the 
Borrower in an aggregate amount of US$6,700,000 (the "AGGREGATE NOTE 
AMOUNT"). We hereby confirm that we will sell and transfer to you under this 
Participation Agreement and you agree to buy and receive from us, an 
undivided interest and participation (your "PARTICIPATION") in the total 
amount of UNITED STATES DOLLARS ONE HUNDRED FIFTY NINE THOUSAND ONE HUNDRED 
SEVENTY ONE AND 60/100THS (US$159,171.60) (the "PARTICIPATION AMOUNT") in our 
Note or Notes, on the following terms and conditions:

     1.   PURCHASE OF PARTICIPATION.  (a) At the Closing, you will pay to us, 
at our account #07695-08132 at Bank of America, San Francisco, California 
(ABA#121-000-358), as the purchase price for your Participation in our Note 
or Notes, an amount equal to the Participation Amount in United States 
dollars and in same day available funds.  We will, promptly upon our receipt 
of this purchase price from you, send you a participation certificate at your 
address below, in substantially the form of Exhibit A, confirming and 
evidencing your Participation.

     (b)  For purposes of this Participation Agreement, "PURCHASED INTEREST" 
means the pro rata fractional interest, expressed as a percentage, of: (i) 
the actual amount paid by you to us under Section 1(a) above as the purchase 
price for your Participation, divided by (ii) the Aggregate Note Amount.

<PAGE>

     (c)  If, for any reason other than a failure to close under the NPA, you 
fail to make timely payment to us of your Participation Amount, in addition 
to other rights and remedies which we may have, we shall be entitled to 
collect interest from you on the unpaid portion of your Participation Amount 
for the period from the date when payment was due until payment is made at 
the overnight rate for Federal funds transactions between member banks of the 
Federal Reserve System, as published by the Federal Reserve Bank of New York 
(the "FEDERAL FUNDS RATE"), for each day during that period.

     (d)  The rights of a Holder pursuant to the NPA and our Note or Notes 
include the right to convert all or part of the Aggregate Note Amount into 
Conversion Shares of the Borrower.  If you give us irrevocable written notice 
of your desire to convert all or part of your Participation into Conversion 
Shares, we will promptly exercise our conversion rights in accordance with 
the NPA with respect to your Purchased Interest in the Aggregate Note Amount 
and cause the corresponding Conversion Shares or other securities to be 
transferred to your name and delivered to you.  Any costs or expenses 
incidental thereto shall be reimbursed to us as set forth in Section 7 below.

     2.   PAYMENTS.  (a) Whenever we receive a payment of principal, 
interest, fees or other payment, or whenever we make an application of funds, 
in connection with our Note or Notes (including, without limitation, any 
payment or application from any property or deposit held or taken by us in 
connection with our Note or Notes, whether as collateral or otherwise), we 
will promptly pay over to you, in United States dollars (or, if another 
currency was received or applied by us, in such other currency) and in the 
kind of funds so received or applied by us, an amount equal to your Purchased 
Interest of such payment or application.

     (b)  All computations of interest, fees, and other costs shall be made 
as set forth in the NPA.  Any determination made by us as to the allocation 
of payments received or amounts applied to your Participation in our Note or 
Notes shall be conclusive and binding for all purposes, absent manifest error.

     (c)  If, for any reason, we make any payment to you before we have 
received the corresponding payment or made the corresponding application (it 
being understood that we are under no obligation to do so), and we do not 
receive the corresponding payment or make the corresponding application 
within three business days of our payment to you, you will, at our request, 
promptly return that payment to us (together with interest on that payment at 
the Federal Funds Rate for each day from the making of that payment to you 
until its return to us).

     (d)  If, after we have paid to you your Purchased Interest of any such 
payment received by us or any such application made by us, such payment or 
application is rescinded or must otherwise be returned or must be paid over 
by us to any other person or entity, whether pursuant to any bankruptcy or 
insolvency law or otherwise, you will, at 

                                       2
<PAGE>

our request, promptly pay back to us your Purchased Interest of the payment 
or application so returned or paid over, together with your Purchased 
Interest of any interest or other amount required to be paid by us with 
respect to such payment or application.

     3.   RESPONSIBILITIES OF SELLER.  We will administer our Note or Notes 
with the same degree of care as is customary generally for the administration 
of corporate loans in the San Francisco financial market, provided that, we 
will not be liable for any error of judgment, or for any action taken or 
omitted to be taken by us, except for our own gross negligence or willful 
misconduct. Without limitation of the generality of the foregoing, we: (a) 
may consult with legal counsel (including counsel for the Borrower), 
independent public accountants and other experts selected by us and shall not 
be liable for any action taken or omitted to be taken in good faith by us in 
accordance with the advice of such counsel, accountants or experts; (b) make 
no warranty or representation and shall not be responsible for any 
statements, warranties or representations (whether written or oral) made in 
or in connection with the NPA or any document relating thereto or for the 
financial condition of the Borrower or for the value of any collateral; (c) 
shall not have any duty to ascertain or to inquire as to the performance or 
observance of any of the terms, covenants or conditions of the NPA or any 
document relating thereto on the part of the Borrower or to inspect the 
property (including the books and records) of the Borrower; (d) shall not be 
responsible for the due execution, legality, validity, enforceability, 
genuineness sufficiency or value of the NPA, our Note or Notes, or any 
document relating thereto or any collateral therefor; and (e) shall incur no 
liability under, or in respect of, the NPA, our Note or Notes, the Conversion 
Shares or any document or collateral related to the foregoing by acting upon 
any notice, certificate or other instrument or writing (which may be by 
telecopier, telegram, cable or telex) believed by us to be genuine and signed 
or sent by the proper party or parties.

     4.   AGREEMENTS OF PURCHASER.  You acknowledge that you have, 
independently and without reliance upon us, and based on your review of the 
NPA and such other financial statements, documents, and information as you 
have deemed appropriate, made your own credit analysis and decision to enter 
into this Participation Agreement.  You also acknowledge that you will, 
independently and without reliance upon us, and based on such financial 
statements, documents, and information as you shall deem appropriate at the 
time, continue to make your own credit decisions in taking or not taking 
action under this Participation Agreement.  You acknowledge that we have 
advised you that your interest in these transactions and your rights under 
the NPA and its related documents may not be the same from your Participation 
as they would be if you had executed such documents as a party.  You 
acknowledge that we may, in our sole discretion, assign or sell other 
participations with respect to our Note or Notes.  You agree to accept any 
Conversion Shares or securities issued in lieu thereof subject to the terms 
and restrictions set forth in the NPA and such other restrictions as may 
apply to us with respect to our Conversion Shares.

                                       3
<PAGE>

     5.   AGREEMENTS OF SELLER.  (a) As of the date of your purchase of a 
Participation in our Note or Notes hereunder and before giving effect 
thereto, (i) we will be the legal owner of such Note or Notes and the 
beneficial owner of such Note or Notes, free and clear of any adverse claim 
(other than your and any other participations), and (ii) we will not have 
actual knowledge of the existence of any Event of Default (as defined in the 
NPA).

     (b)  We have furnished you with copies of the NPA and the other 
documents delivered to us in connection with the NPA and requested by you.  
Upon your request, we will furnish to you copies of the publicly-available 
financial statements and other publicly-available documents, and (subject to 
any duty of confidentiality to which we are subject) such other documents as 
we shall receive pursuant to the NPA, but we assume no responsibility with 
respect to the authenticity, validity, accuracy or completeness thereof.  You 
agree to maintain the confidentiality of any confidential information 
included in this documentation.

     (c)  We will give you prompt notice of the occurrence of any Event of 
Default under the NPA of which we shall have actual knowledge, but no failure 
to give you any such notice shall result in any liability on our part to you.

     6.   ADMINISTRATION BY SELLER.  (a) We will carry out our administrative 
duties to you under this Participation Agreement in accordance with the terms 
of this Participation Agreement and as otherwise required by applicable law.

     (b)  We shall not, without your prior written consent, agree to the 
amendment, modification, or waiver of any of the terms of the NPA, our Note 
or Notes, or any agreement or document relating thereto or any collateral 
therefor, consent to any action or failure to act by the Borrower or any 
other party, or exercise any rights we may have in respect thereof, if, in 
any case, such amendment, modification, waiver, consent or exercise would: 
(i) increase the amount of the Aggregate Note Amount, (ii) reduce the 
principal amount of or rate of interest on our Note or Notes or any fee or 
other charge of which you are entitled to receive a share under this 
Participation Agreement and payable under the NPA, (iii) postpone any date 
fixed for any payment of principal of or interest on our Note or Notes or any 
fee or charge of which you are entitled to receive a share under this 
Participation Agreement and payable under the NPA, (iv) release any 
collateral, except as otherwise contemplated in any document relating thereto 
or (v) amend the conversion rights set forth in the NPA or our Note or Notes. 
If we shall request your written consent to any of the actions described in 
this paragraph (b), and shall not receive your consent or a denial thereof in 
writing within 10 days of the making of such request, you shall be deemed to 
have given your consent.

     (c)  Except as otherwise expressly provided in this Section 6, we 
reserve the right, in our sole discretion, in each instance, without prior 
notice to you, to agree to the 

                                       4
<PAGE>

amendment, modification or waiver of any of the terms of the NPA, our Notes 
or Notes, or any agreement or document relating thereto, to consent to any 
action or failure to act by the Borrower or any other party, and to exercise 
or refrain from exercising any powers or rights which we may have under or in 
respect of the NPA, our Note or Notes, or any agreement or document relating 
thereto or any collateral therefor, including, without limitation, the right 
to enforce the obligations of the Borrower or any other party.


     7.   REIMBURSEMENT OF EXPENSES.  You will on demand reimburse us to the 
extent of your Purchased Interest for any and all reasonable costs, expenses 
and disbursements (including, without limitation, reasonable attorneys' fees) 
which may be incurred or made by us in connection with our Note or Notes, and 
any action which may be taken by us to collect or enforce any obligation of 
the Borrower or any other party in respect of our Note or Notes or the NPA, 
for which we are not reimbursed at any time by or on behalf of the Borrower.  
We shall be entitled to deduct from any payments to be made to you under this 
Participation Agreement, and to retain, your Purchased Interest of, any and 
all reasonable costs, expenses and disbursements which may be incurred or 
made by us in connection with the enforcement of any obligation of the 
Borrower or any other person in respect of our Note or Notes or the NPA.

     8.   SHARING OF PAYMENTS.  If you shall obtain any payment (whether 
voluntary, involuntary, through the exercise of any right of set-off, or 
otherwise) on account of our Note or Notes which is in excess of your 
Purchased Interest in payments on account of our Note or Notes obtained by 
us, you shall forthwith purchase from us such additional Participation in our 
Note or Notes as shall be necessary to cause you to share such excess payment 
ratably with us, PROVIDED, HOWEVER, that if all or any portion of such excess 
payment is thereafter recovered from you, such purchase from us shall be 
rescinded and we shall repay to you the purchase price to the extent of such 
recovery (together with interest on that amount at the Federal Funds Rate for 
each day from the date of payment of such purchase price to us until the 
return of such purchase price to you).

     9.   PROPERTY OR COLLATERAL.  With respect to any and all property or 
collateral taken by us, you shall have no interest in that property or 
collateral, except that if that property or collateral, or the proceeds 
thereof, shall be applied in reduction of amounts outstanding in connection 
with our Note or Notes, then you shall be entitled to your Purchased Interest 
therein (determined in accordance with Section 2).

     10.  TAXES.  (a)  With respect to any payment made to or by you 
hereunder, you agree to pay (or, alternatively, to permit us to pay on your 
behalf) any present or future taxes, levies, imposts, deductions, charges, or 
withholdings, and all liabilities with respect thereto, excluding taxes 
imposed on net income and all income and franchise taxes of the United States 
and any political subdivisions thereof (all such non-excluded taxes, levies, 
imposts, deductions, charges, withholdings and liabilities being hereinafter 
referred to as "TAXES").

                                       5
<PAGE>

     (b)  In addition, you agree to pay any present or future stamp or 
documentary taxes or any other excise or property taxes, charges, or similar 
levies which arise from any payment made hereunder or from the execution, 
delivery, registration, or otherwise with respect to this Participation 
Agreement or the transfer to you of your Conversion Shares or securities 
issued in lieu thereof (hereinafter referred to as "OTHER TAXES").

     (c)  You will indemnify us for the full amount of Taxes or Other Taxes 
(including, without limitation, any Taxes or Other Taxes imposed by any 
jurisdiction on amounts payable under this Section 10) paid by us and any 
liability (including penalties, interest or expenses) arising therefrom or 
with respect thereto, whether or not such Taxes or Other Taxes were correctly 
or legally asserted.  This indemnification shall be made within 30 days from 
the date we make written demand therefor.

     (d)  You agree to provide to us, from time to time, completed and signed 
copies of any forms that may be required by the United States Internal 
Revenue Service in order to certify your exemption from United States 
withholding taxes with respect to payments to be made to you under this 
Participation Agreement.

     11.  SILENT PARTICIPATION; SUBPARTICIPATIONS.     (a)  You shall not, 
without our prior written consent, notify or contact the Borrower with 
respect to any Participation.  Notwithstanding the foregoing, you shall have 
the right to disclose this Participation, and the name of the Borrower with 
respect thereto, in any filing, prospectus or other document made available 
publicly or to your customers or otherwise as required by law.

     (b)  You shall not subparticipate, assign, or transfer your 
Participation in our Note or Notes without our prior written consent, except 
as provided in this Section 11.  You may, upon prior written notice to us, 
but without our consent, subparticipate all or any part of your Participation 
in our Note or Notes, or for the benefit of, any of your subsidiaries or 
affiliates, provided that: (i) your obligations under this Participation 
Agreement shall remain unchanged and you shall remain solely responsible for 
the performance of your obligations under this Participation Agreement, and 
(ii) we shall continue to deal solely and directly with you in connection 
with your rights and obligations under this Participation Agreement.

     12.  TERMINATION.  This Participation Agreement is a continuing 
agreement and shall remain in full force and effect until the indefeasible 
payment in full of all amounts owing under our Note or Notes.

     13.  NOTICES AND PAYMENTS.  All notices and other communications 
provided for under this Participation Agreement shall be in writing 
(including telecopier, telegram, cable or telex communications), unless 
otherwise specified, and shall be sent to you at the 

                                       6
<PAGE>

address set forth above or to us at the address set forth below (or such 
other address as you or we may designate in writing).

     14.  GOVERNING LAW.  This Participation Agreement shall be governed by 
and construed in accordance with the laws of the State of California.

                       [SIGNATURE PAGE FOLLOWS THIS PAGE]




                                       7
<PAGE>

     Please confirm your agreement with the foregoing by executing the 
enclosed copy hereof and returning the same to us by July 31, 1998.

                                       Very truly yours,


                                       BCC ACQUISITION II LLC


                                       By: /s/ Roger H. Salquist
                                           ------------------------------------
                                           Name:
                                           Title:

                                       Address:



Agreed and Accepted:

    July 30          1998
- --------------------   --


BANCA DELLA SVIZZERA ITALIANA



By: /s/ B. Ripamonti                           /s/ A. De Angelis
    --------------------------------       --------------------------------
    Name:   B. Ripamonti                        A. De Angelis
    Title:  Vice President                      First Vice-President


                                       S-1
<PAGE>

                                    EXHIBIT A

                            PARTICIPATION CERTIFICATE


                                                       [Date of Participation]
Banca della Svizzera Italiana
via Peri, 23
6900 Lugano
Switzerland


                    Re:  Diametrics Medical, Inc. Note or Notes
                         ----------------------------------------

Ladies and Gentlemen:

     We hereby confirm that we have sold and transferred to you for your 
account and risk, upon the terms and conditions of our Participation 
Agreement with you, dated July__, 1998, an undivided interest and 
participation (your "Participation") to the extent of _______% (your 
"Purchased Interest") in and to our aggregate loan of US$6,700,000 
("Aggregate Note Amount") made by us on August __, 1998, to Diametrics 
Medical, Inc. (the "Borrower") pursuant to the Note Purchase Agreement, dated 
as of August __, 1998, between the Borrower and the undersigned.

     We acknowledge receipt from you of the sum of US$159,171.60 in payment 
of your Participation in such Aggregate Note Amount.

                                       Very truly yours,

                                       BCC ACQUISITION II LLC


                                       By 
                                          ------------------------------------
                                          Name:
                                          Title:


<PAGE>

                               PARTICIPATION AGREEMENT


                                                                 July __, 1998


Banca del Gottardo
via Francini, 8
6901 Lugano
Switzerland

Attn:   A. Polli

                     Re:  Diametrics Medical, Inc. Note or Notes
                          --------------------------------------

Ladies and Gentlemen:

     We refer to the Note Purchase Agreement to be executed at the Closing 
pursuant to the Common Stock Purchase Agreement dated June 30, 1998 between 
Diametrics Medical, Inc. (the "BORROWER") and certain signatories thereto 
identified as "Purchasers" (including us), a copy of which has been furnished 
to you.  That Note Purchase Agreement, as it may hereafter be amended or 
otherwise modified from time to time, is sometimes referred to in this 
participation agreement (the "PARTICIPATION AGREEMENT") as the "NPA" and the 
terms defined in the NPA and not otherwise defined in this Participation 
Agreement have the same meaning when used herein.

     Pursuant to the NPA, we intend to purchase a Note or Notes from the 
Borrower in an aggregate amount of US$6,700,000 (the "AGGREGATE NOTE 
AMOUNT"). We hereby confirm that we will sell and transfer to you under this 
Participation Agreement and you agree to buy and receive from us, an 
undivided interest and participation (your "PARTICIPATION") in the total 
amount of United States Dollars ONE HUNDRED FIFTY NINE THOUSAND ONE HUNDRED 
SIXTY THREE AND 20/100THS (US$159,163.20) (the "PARTICIPATION AMOUNT") in our 
Note or Notes, on the following terms and conditions:

     1.   PURCHASE OF PARTICIPATION.  (a) At the Closing, you will pay to us, 
at our account #07695-08132 at Bank of America, San Francisco, California 
(ABA#121-000-358), as the purchase price for your Participation in our Note 
or Notes, the Participation Amount in United States dollars and in same day 
available funds.  We will, promptly upon our receipt of this purchase price 
from you, send you a participation certificate at your address below, in 
substantially the form of Exhibit A, confirming and evidencing your 
Participation.

<PAGE>

     (b)  For purposes of this Participation Agreement, "PURCHASED INTEREST" 
means the pro rata fractional interest, expressed as a percentage, of: (i) 
the actual amount paid by you to us under Section 1(a) above as the purchase 
price for your Participation, divided by (ii) the Aggregate Note Amount.

     (c)  If, for any reason other than a failure to close under the NPA, you 
fail to make timely payment to us of your Participation Amount, in addition 
to other rights and remedies which we may have, we shall be entitled to 
collect interest from you on the unpaid portion of your Participation Amount 
for the period from the date when payment was due until payment is made at 
the overnight rate for Federal funds transactions between member banks of the 
Federal Reserve System, as published by the Federal Reserve Bank of New York 
(the "FEDERAL FUNDS RATE"), for each day during that period.

     (d)  The rights of a Holder pursuant to the NPA and our Note or Notes 
include the right to convert all or part of the Aggregate Note Amount into 
Conversion Shares of the Borrower.  If you give us irrevocable written notice 
of your desire to convert all or part of your Participation into Conversion 
Shares, we will promptly exercise our conversion rights in accordance with 
the NPA with respect to your Purchased Interest in the Aggregate Note Amount 
and cause the corresponding Conversion Shares or other securities to be 
transferred to your name and delivered to you.  Any costs or expenses 
incidental thereto shall be reimbursed to us as set forth in Section 7 below.

     2.   PAYMENTS.  (a) Whenever we receive a payment of principal, 
interest, fees or other payment, or whenever we make an application of funds, 
in connection with our Note or Notes (including, without limitation, any 
payment or application from any property or deposit held or taken by us in 
connection with our Note or Notes, whether as collateral or otherwise), we 
will promptly pay over to you, in United States dollars (or, if another 
currency was received or applied by us, in such other currency) and in the 
kind of funds so received or applied by us, an amount equal to your Purchased 
Interest of such payment or application.

     (b)  All computations of interest, fees, and other costs shall be made 
as set forth in the NPA.  Any determination made by us as to the allocation 
of payments received or amounts applied to your Participation in our Note or 
Notes shall be conclusive and binding for all purposes, absent manifest error.

     (c)  If, for any reason, we make any payment to you before we have 
received the corresponding payment or made the corresponding application (it 
being understood that we are under no obligation to do so), and we do not 
receive the corresponding payment or make the corresponding application 
within three business days of our payment to you, you will, at our request, 
promptly return that payment to us (together 

                                       2
<PAGE>

with interest on that payment at the Federal Funds Rate for each day from the 
making of that payment to you until its return to us).

     (d)  If, after we have paid to you your Purchased Interest of any such 
payment received by us or any such application made by us, such payment or 
application is rescinded or must otherwise be returned or must be paid over 
by us to any other person or entity, whether pursuant to any bankruptcy or 
insolvency law or otherwise, you will, at our request, promptly pay back to 
us your Purchased Interest of the payment or application so returned or paid 
over, together with your Purchased Interest of any interest or other amount 
required to be paid by us with respect to such payment or application.

     3.   RESPONSIBILITIES OF SELLER.  We will administer our Note or Notes 
with the same degree of care as is customary generally for the administration 
of corporate loans in the San Francisco financial market, provided that, we 
will not be liable for any error of judgment, or for any action taken or 
omitted to be taken by us, except for our own gross negligence or willful 
misconduct. Without limitation of the generality of the foregoing, we: (a) 
may consult with legal counsel (including counsel for the Borrower), 
independent public accountants and other experts selected by us and shall not 
be liable for any action taken or omitted to be taken in good faith by us in 
accordance with the advice of such counsel, accountants or experts; (b) make 
no warranty or representation and shall not be responsible for any 
statements, warranties or representations (whether written or oral) made in 
or in connection with the NPA or any document relating thereto or for the 
financial condition of the Borrower or for the value of any collateral; (c) 
shall not have any duty to ascertain or to inquire as to the performance or 
observance of any of the terms, covenants or conditions of the NPA or any 
document relating thereto on the part of the Borrower or to inspect the 
property (including the books and records) of the Borrower; (d) shall not be 
responsible for the due execution, legality, validity, enforceability, 
genuineness sufficiency or value of the NPA, our Note or Notes, or any 
document relating thereto or any collateral therefor; and (e) shall incur no 
liability under, or in respect of, the NPA, our Note or Notes, the Conversion 
Shares or any document or collateral related to the foregoing by acting upon 
any notice, certificate or other instrument or writing (which may be by 
telecopier, telegram, cable or telex) believed by us to be genuine and signed 
or sent by the proper party or parties.

     4.   AGREEMENTS OF PURCHASER.  You acknowledge that you have, 
independently and without reliance upon us, and based on your review of the 
NPA and such other financial statements, documents, and information as you 
have deemed appropriate, made your own credit analysis and decision to enter 
into this Participation Agreement.  You also acknowledge that you will, 
independently and without reliance upon us, and based on such financial 
statements, documents, and information as you shall deem appropriate at the 
time, continue to make your own credit decisions in taking or not taking 
action under this Participation Agreement.  You acknowledge that we have 
advised you that your interest in these transactions and your rights under 
the NPA and its related 

                                       3
<PAGE>

documents may not be the same from your Participation as they would be if you 
had executed such documents as a party.  You acknowledge that we may, in our 
sole discretion, assign or sell other participations with respect to our Note 
or Notes.  You agree to accept any Conversion Shares or securities issued in 
lieu thereof subject to the terms and restrictions set forth in the NPA and 
such other restrictions as may apply to us with respect to our Conversion 
Shares.

      5.   AGREEMENTS OF SELLER.  (a) As of the date of your purchase of a 
Participation in our Note or Notes hereunder and before giving effect 
thereto, (i) we will be the legal owner of such Note or Notes and the 
beneficial owner of such Note or Notes, free and clear of any adverse claim 
(other than your and any other participations), and (ii) we will not have 
actual knowledge of the existence of any Event of Default (as defined in the 
NPA).

     (b)  We have furnished you with copies of the NPA and the other 
documents delivered to us in connection with the NPA and requested by you.  
Upon your request, we will furnish to you copies of the publicly-available 
financial statements and other publicly-available documents, and (subject to 
any duty of confidentiality to which we are subject) such other documents as 
we shall receive pursuant to the NPA, but we assume no responsibility with 
respect to the authenticity, validity, accuracy or completeness thereof.  You 
agree to maintain the confidentiality of any confidential information 
included in this documentation.

     (c)  We will give you prompt notice of the occurrence of any Event of 
Default under the NPA of which we shall have actual knowledge, but no failure 
to give you any such notice shall result in any liability on our part to you.

     6.   ADMINISTRATION BY SELLER.  (a) We will carry out our administrative 
duties to you under this Participation Agreement in accordance with the terms 
of this Participation Agreement and as otherwise required by applicable law.

     (b)  We shall not, without your prior written consent, agree to the 
amendment, modification, or waiver of any of the terms of the NPA, our Note 
or Notes, or any agreement or document relating thereto or any collateral 
therefor, consent to any action or failure to act by the Borrower or any 
other party, or exercise any rights we may have in respect thereof, if, in 
any case, such amendment, modification, waiver, consent or exercise would: 
(i) increase the amount of the Aggregate Note Amount, (ii) reduce the 
principal amount of or rate of interest on our Note or Notes or any fee or 
other charge of which you are entitled to receive a share under this 
Participation Agreement and payable under the NPA, (iii) postpone any date 
fixed for any payment of principal of or interest on our Note or Notes or any 
fee or charge of which you are entitled to receive a share under this 
Participation Agreement and payable under the NPA, (iv) release any 
collateral, except as otherwise contemplated in any document relating thereto 
or (v) amend the 

                                       4
<PAGE>

conversion rights set forth in the NPA or our Note or Notes. If we shall 
request your written consent to any of the actions described in this 
paragraph (b), and shall not receive your consent or a denial thereof in 
writing within 10 days of the making of such request, you shall be deemed to 
have given your consent.

     (c)  Except as otherwise expressly provided in this Section 6, we 
reserve the right, in our sole discretion, in each instance, without prior 
notice to you, to agree to the amendment, modification or waiver of any of 
the terms of the NPA, our Notes or Notes, or any agreement or document 
relating thereto, to consent to any action or failure to act by the Borrower 
or any other party, and to exercise or refrain from exercising any powers or 
rights which we may have under or in respect of the NPA, our Note or Notes, 
or any agreement or document relating thereto or any collateral therefor, 
including, without limitation, the right to enforce the obligations of the 
Borrower or any other party.

     7.   REIMBURSEMENT OF EXPENSES.  You will on demand reimburse us to the 
extent of your Purchased Interest for any and all reasonable costs, expenses 
and disbursements (including, without limitation, reasonable attorneys' fees) 
which may be incurred or made by us in connection with our Note or Notes, and 
any action which may be taken by us to collect or enforce any obligation of 
the Borrower or any other party in respect of our Note or Notes or the NPA, 
for which we are not reimbursed at any time by or on behalf of the Borrower.  
We shall be entitled to deduct from any payments to be made to you under this 
Participation Agreement, and to retain, your Purchased Interest of, any and 
all reasonable costs, expenses and disbursements which may be incurred or 
made by us in connection with the enforcement of any obligation of the 
Borrower or any other person in respect of our Note or Notes or the NPA.

     8.   SHARING OF PAYMENTS.  If you shall obtain any payment (whether 
voluntary, involuntary, through the exercise of any right of set-off, or 
otherwise) on account of our Note or Notes which is in excess of your 
Purchased Interest in payments on account of our Note or Notes obtained by 
us, you shall forthwith purchase from us such additional Participation in our 
Note or Notes as shall be necessary to cause you to share such excess payment 
ratably with us, PROVIDED, HOWEVER, that if all or any portion of such excess 
payment is thereafter recovered from you, such purchase from us shall be 
rescinded and we shall repay to you the purchase price to the extent of such 
recovery (together with interest on that amount at the Federal Funds Rate for 
each day from the date of payment of such purchase price to us until the 
return of such purchase price to you).

     9.   PROPERTY OR COLLATERAL.  With respect to any and all property or 
collateral taken by us, you shall have no interest in that property or 
collateral, except that if that property or collateral, or the proceeds 
thereof, shall be applied in reduction of amounts outstanding in connection 
with our Note or Notes, then you shall be entitled to your Purchased Interest 
therein (determined in accordance with Section 2).

                                       5
<PAGE>

     10.  TAXES.  (a)  With respect to any payment made to or by you 
hereunder, you agree to pay (or, alternatively, to permit us to pay on your 
behalf) any present or future taxes, levies, imposts, deductions, charges, or 
withholdings, and all liabilities with respect thereto, excluding taxes 
imposed on net income and all income and franchise taxes of the United States 
and any political subdivisions thereof (all such non-excluded taxes, levies, 
imposts, deductions, charges, withholdings and liabilities being hereinafter 
referred to as "TAXES").

     (b)  In addition, you agree to pay any present or future stamp or 
documentary taxes or any other excise or property taxes, charges, or similar 
levies which arise from any payment made hereunder or from the execution, 
delivery, registration, or otherwise with respect to this Participation 
Agreement or the transfer to you of your Conversion Shares or securities 
issued in lieu thereof (hereinafter referred to as "OTHER TAXES").

     (c)  You will indemnify us for the full amount of Taxes or Other Taxes 
(including, without limitation, any Taxes or Other Taxes imposed by any 
jurisdiction on amounts payable under this Section 10) paid by us and any 
liability (including penalties, interest or expenses) arising therefrom or 
with respect thereto, whether or not such Taxes or Other Taxes were correctly 
or legally asserted.  This indemnification shall be made within 30 days from 
the date we make written demand therefor.

     (d)  You agree to provide to us, from time to time, completed and signed 
copies of any forms that may be required by the United States Internal 
Revenue Service in order to certify your exemption from United States 
withholding taxes with respect to payments to be made to you under this 
Participation Agreement.

     11.  SILENT PARTICIPATION; SUBPARTICIPATIONS.  (a)  You shall not, 
without our prior written consent, notify or contact the Borrower with 
respect to any Participation.  Notwithstanding the foregoing, you shall have 
the right to disclose this Participation, and the name of the Borrower with 
respect thereto, in any filing, prospectus or other document made available 
publicly or to your customers or otherwise as required by law.

     (b)  You shall not subparticipate, assign, or transfer your 
Participation in our Note or Notes without our prior written consent, except 
as provided in this Section 11.  You may, upon prior written notice to us, 
but without our consent, subparticipate all or any part of your Participation 
in our Note or Notes, or for the benefit of, any of your subsidiaries or 
affiliates, provided that: (i) your obligations under this Participation 
Agreement shall remain unchanged and you shall remain solely responsible for 
the performance of your obligations under this Participation Agreement, and 
(ii) we shall continue to deal solely and directly with you in connection 
with your rights and obligations under this Participation Agreement.

                                       6
<PAGE>

     12.  TERMINATION.  This Participation Agreement is a continuing 
agreement and shall remain in full force and effect until the indefeasible 
payment in full of all amounts owing under our Note or Notes.

     13.  NOTICES AND PAYMENTS.  All notices and other communications 
provided for under this Participation Agreement shall be in writing 
(including telecopier, telegram, cable or telex communications), unless 
otherwise specified, and shall be sent to you at the address set forth above 
or to us at the address set forth below (or such other address as you or we 
may designate in writing).

     14.  GOVERNING LAW.  This Participation Agreement shall be governed by 
and construed in accordance with the laws of the State of California.

                         [SIGNATURE PAGE FOLLOWS THIS PAGE]



                                       7
<PAGE>

     Please confirm your agreement with the foregoing by executing the 
enclosed copy hereof and returning the same to us by July 31, 1998.

                                       Very truly yours,


                                       BCC ACQUISITION II LLC


                                       By: /s/ Roger H. Salquist
                                           -------------------------------
                                           Name:
                                           Title:

                                       Address:


Agreed and Accepted:
July 30, 1998

BANCA DEL GOTTARDO

By: /s/ Fabio Testori                              /s/ Claudio Poli
    -------------------------------------        ------------------------------
   Name:   Fabio Testori                           Claudio Poli
   Title:  Member of the Executive Board           Officer

                                      S-1
<PAGE>

                                   EXHIBIT A

                           PARTICIPATION CERTIFICATE


                                                         [Date of Participation]
Banca del Gottardo
via Francini, 8
6901 Lugano
Switzerland

Attn:  A. Polli

                    Re:  Diametrics Medical, Inc. Note or Notes
                         --------------------------------------

Ladies and Gentlemen:

     We hereby confirm that we have sold and transferred to you for your 
account and risk, upon the terms and conditions of our Participation 
Agreement with you, dated July __, 1998, an undivided interest and 
participation (your "Participation") to the extent of _______% (your 
"Purchased Interest") in and to our aggregate loan of US$6,700,000 
("Aggregate Note Amount") made by us on August __, 1998, to Diametrics 
Medical, Inc. (the "Borrower") pursuant to the Note Purchase Agreement, dated 
as of August __, 1998, between the Borrower and the undersigned.

     We acknowledge receipt from you of the sum of US$159,163.20 in payment 
of your Participation in such Aggregate Note Amount.

                                       Very truly yours,

                                       BCC ACQUISITION II LLC


                                       By:
                                           -------------------------------
                                           Name:
                                           Title:



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