DIAMETRICS MEDICAL INC
SC 13D, 1997-04-21
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  Schedule 13D

                   Under the Securities Exchange Act of 1934
                         (Amendment No. _____________)*


                            DIAMETRICS MEDICAL, INC.
                            ------------------------
                                (Name of Issuer)


                          Common Stock, $.01 par value
                          ----------------------------
                         (Title of Class of Securities)


                                  252532 10 6
                      -------------------------------------
                                 (CUSIP Number)


   Mindy C. Sircus, Esq., Neal, Gerber & Eisenberg, 2 North LaSalle Street,
- ------------------------------------------------------------------------------
                    Chicago, Illinois 60602, (312) 269-8000
                    ---------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                                April 10, 1997
                      -----------------------------------
                         (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 which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Note: Six copies of this Statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter disclosure
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


                       (Continued on following page(s))

                              Page 1 of 10 Pages

                      INDEX TO EXHIBITS APPEARS ON PAGE 8
<PAGE>
 
                                      13D
- -----------------------                                  ---------------------
  CUSIP NO.                                                PAGE 2 OF 10 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      AMARFOUR, L.L.C.                                   
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
           00
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
           Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF                  947,000 shares of Common Stock       
                             
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                                0
     OWNED BY                    
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING                   947,000 shares of Common Stock
                         
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                                0 
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
            947,000 shares of Common Stock
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
            See Item 5.                                             [X]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
            Approximately 5.2%      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
            00
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
Item 1.   Security and Issuer.
          ------------------- 

     The class of equity securities to which this statement relates is the
common stock, $.01 par value per share (the "Common Stock") of Diametrics
Medical, Inc., a Minnesota corporation (the "Issuer").  The principal executive
offices of the Issuer are located at 2658 Patton Road, Roseville, Minnesota
55113.

Item 2.   Identity and Background.
          ----------------------- 

     This statement is filed on behalf of AMARFOUR, L.L.C., Delaware limited
liability company ("Amarfour" or the "Reporting Person"), the principal offices
of which are located at 200 West Madison Street, Suite 3800, Chicago, Illinois
60606. Certain information regarding the members of Amarfour and the controlling
persons thereof is included in Appendix A attached hereto and incorporated
herein by this reference.

     During the last five years, neither the Reporting Person nor, to the best
of its knowledge, any of its members or any person controlling such members has
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors) or has been a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violation with respect to such laws.

Item 3.   Source and Amount of Funds or Other Consideration.
          ------------------------------------------------- 

     From March 18, 1996 through April 17, 1996, Amarfour purchased a total of
322,000 shares of Common Stock on the open market for an aggregate purchase
price (inclusive of commissions) of $1,996,815.  In addition, on January 30,
1997, Amarfour purchased a total of 125,000

                                  Page 3 of 10
<PAGE>
 
shares of the Issuer's Series I Junior Participating Preferred Stock, $.01 par
value (the "Preferred Stock"), from the Issuer for an aggregate purchase price
of $2,000,000. Each share of Preferred Stock was automatically convertible into
four shares of Common Stock upon approval by the Issuer's shareholders of an
increase in the number of authorized shares of Common Stock. (See Item 5 below).
In connection with its purchase of Preferred Stock, Amarfour also received
detachable warrants with an exercise price (subject to adjustment) equal to
$5.0625 per share (the "Warrants"), to purchase 125,000 shares of Common Stock.
Amarfour used contributions from its members in purchasing its shares of Common
Stock. In purchasing its shares of Preferred Stock and Warrants, on January 30,
1997, Amarfour borrowed $2,000,000 from Diversified Capital, L.P., an associated
entity. This loan is payable on demand and bears interest at prime.

Item 4.   Purposes of Transaction.
          ----------------------- 

     Amarfour acquired the shares of Common Stock, Preferred Stock and Warrants
for investment.  Pursuant to the Stock Purchase Agreement (as hereinafter
defined), Amarfour has the right (through January 29, 2002) to advance notice
of, and to invest in, certain proposed sales of securities by the Issuer.
Amarfour has no present plans or proposals which relate to or would result in
any of the other actions referred to in clauses (a) through (j) of Item 4 of
Schedule 13D.  However, depending on market conditions, the business and
prospects of the Issuer and other relevant factors, Amarfour may (i) purchase
additional shares of Common Stock on such terms and at such times as it
considers desirable, including, without limitation, by exercising the Warrants,
(ii) continue to hold the shares of Common Stock which it beneficially owns,
(iii) dispose of all or a portion of the Common Stock which it beneficially owns
or (iv) implement plans or proposals which relate to or would result in any of
the actions referred to in clauses (a) through (j) of Item 4 of Schedule 13D.

                                  Page 4 of 10

<PAGE>
 
Item 5.   Interest in Securities of the Issuer.
          ------------------------------------ 

          (a)-(b) For the purpose of Rule 13d-3 promulgated under the Securities
Exchange Act of 1934, as amended (the "Exchange Act") as of the date hereof,
Amarfour beneficially owns, and has sole power to vote and to dispose of,
947,000 shares of Common Stock, representing approximately 5.2% of the
outstanding Common Stock of the Issuer.

     An affiliate of Amarfour owns approximately a 5.57% limited partnership
interest in Frazier Healthcare Investments, L.P., a shareholder of the Issuer,
and 16.95 limited partnership units in Frazier & Company, L.P., the general
partner of the general partner of Frazier Healthcare Investments, L.P.  In
addition, another affiliate of Amarfour owns an 8% membership interest in
Frazier Management, L.L.C., the general partner of Frazier & Company, L.P.
Amarfour disclaims beneficial ownership of the Issuer's securities owned by each
of Frazier Healthcare Investments, L.P., Frazier & Company, L.P. and Frazier
Management, L.L.C.

          (c) As disclosed in Item 3 above, Amarfour purchased 125,000 shares of
Preferred Stock from the Issuer on January 30, 1997 for an aggregate purchase
price of $2,000,000 (or $16.00 per share), and in connection therewith, received
Warrants to purchase 125,000 shares of Common Stock.  Each share of Preferred
Stock was automatically converted into four shares of Common Stock on April 10,
1997, the date on which the Issuer's shareholders approved an increase in the
number of authorized shares of Common Stock.

     During the past 60 days, neither Amarfour, nor, to the best knowledge of
Amarfour, any of the persons identified in Appendix A hereof, have effected any
other transactions in the Common Stock.

          (d)  None.

          (e)  Not applicable.

                                  Page 5 of 10

<PAGE>
 
Item 6.   Contracts, Arrangements, Understandings or Relationships with Respect
          ---------------------------------------------------------------------
          to Securities of the Issuer.
          --------------------------- 

     Amarfour purchased the Preferred Stock and Warrants in accordance with the
terms of the Stock Purchase Agreement dated as of January 30, 1997, by and
between the Issuer and Amarfour, among others (the "Stock Purchase Agreement"),
including, Exhibit I thereto, Form of Warrant.  In connection therewith,
Amarfour, the Issuer and others also entered into the Registration Rights
Agreement dated as of January 30, 1997 (the "Registration Rights Agreement").

     Except for the Stock Purchase Agreement and the Registration Rights
Agreement, to the best knowledge of the Reporting Person, there are no
contracts, arrangements, understandings or relationships (legal or otherwise)
between the persons enumerated in Item 2, and any other person, with respect to
any securities of the Issuer, including, but not limited to, transfer or voting
of any of the securities, finder's fees, joint ventures, loan or option
arrangements, puts or calls, guarantees of profits, division of profits or loss,
or the giving or withholding of proxies.

Item 7.   Material to be Filed as Exhibits.
          -------------------------------- 

     Exhibit 1:  Stock Purchase Agreement dated as of January 30, 1997 by and
                 among the Issuer and Amarfour, among others, including,
                 Exhibit I thereto, Form of Warrant.

     Exhibit 2:  Registration Rights Agreement dated as of January 30, 1997, by
                 and between the Issuer and Amarfour, among others.

                                  Page 6 of 10

<PAGE>
 
                                   SIGNATURES

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

Date: April 21, 1997        AMARFOUR, L.L.C., a Delaware limited
                            liability company


                         By:  AMARILLO RESIDUARY TRUST NO. 1, a member



                         By:  /s/ Marshall E. Eisenberg
                            -------------------------------------------
                            Marshall E. Eisenberg, not individually,
                            but solely as Trustee of Amarillo Residuary
                            Trust No. 1

                                  Page 7 of 10
<PAGE>
 
                                 EXHIBIT INDEX
                                 -------------
<TABLE>
<CAPTION>
Exhibit          Description                                     Page
- -------          -----------                                     ----
<S>              <C>                                             <C>
 
Exhibit 1:       Stock Purchase Agreement dated as of January
                 30, 1997 by and among the Issuer and
                 Amarfour, among others, including, Exhibit I
                 thereto, Form of Warrant.
 
Exhibit 2:       Registration Rights Agreement dated as of
                 January 30, 1997, by and between the Issuer
                 and Amarfour, among others.
</TABLE>

                                  Page 8 of 10
<PAGE>
 
                                   APPENDIX A
                                   ----------


     Set forth below is certain information regarding the members of Amarfour
and the controlling persons thereof.

     1.   Information Regarding AMARFOUR, L.L.C.
          --------------------------------------

     The members of Amarfour are the ten separate and distinct Amarillo
Residuary Trusts Nos. 1-10 (collectively, the "Trusts"), each of which is
governed by the laws of Illinois.  The business address for the Trusts is 200
West Madison Street, Suite 3800, Chicago, Illinois.  The Trusts were created for
the benefit of certain lineal descendants of Nicholas J. Pritzker, deceased.

     2.   Information Regarding the Trustees of the Trusts
          ------------------------------------------------

     The name, business address and present principal occupation or employment
of each trustee of the trusts and the name and principal business of any
corporation or other organization in which such employment is conducted is set
forth below.  Each trustee listed below is a United States citizen.

                                   Present Principal Occupation
Name and Business Address                 Or Employment
- -------------------------                 -------------

Thomas J. Pritzker                 President of Hyatt Corporation, a
200 West Madison Street            diversified company primarily
Chicago, Illinois  60606           engaged in real estate and hotel
(Co-Trustee of Trusts 2-10)        management activities.

Marshall E. Eisenberg              Partner in the law firm of
2 North LaSalle Street             Neal, Gerber & Eisenberg.
Suite 2200
Chicago, Illinois  60602
(Trustee of Trust 1 and 
Co-Trustee of Trusts 2-10)

     To the best of Amarfour's knowledge, neither Messrs. Pritzker or Eisenberg
have, during the last five years, (i) been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors) or (ii) been a party to a
civil proceeding of a judicial

                                  Page 9 of 10
<PAGE>
 
or administrative body of competent jurisdiction and as a result of such
proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to federal
or state securities laws, or finding any violation with respect to such laws.

                                 Page 10 of 10


<PAGE>
 
                                                                     EXHIBIT 4.1


                           STOCK PURCHASE AGREEMENT

     AGREEMENT, made as of January 30, 1997, between DIAMETRICS MEDICAL, INC. a
Minnesota corporation (the "Company") and the purchasers (the "Purchasers")
listed on Schedule A hereto.

     WHEREAS, the Company wishes to raise additional capital; and

     WHEREAS, the Company does not yet have sufficient authorized shares of its
$.01 par value common stock ("Common Stock") for purposes of a private placement
of 3,000,000 shares of its Common Stock; and

     WHEREAS, the Company does have 5,000,000 authorized shares of undesignated
preferred stock; and

     WHEREAS, the Company will call a special shareholders meeting to approve an
increase in its authorized Common Stock; and

     WHEREAS, the Purchasers desire to purchase shares of a series of the
Company's preferred stock (the "Preferred Stock") that will be convertible into
Common Stock upon approval by shareholders of an increase in the authorized
Common Stock together with detachable warrants to purchase additional shares of
Common Stock.

     NOW THEREFORE, the parties hereto hereby agree as follows:

     1.   Purchase of Preferred Stock.  The Purchasers hereby agree to purchase
          ---------------------------                                 
from the Company and the Company hereby agrees to sell to Purchasers the number
of shares of Preferred Stock (the "Preferred Stock") set forth opposite the name
of each Purchaser in Schedule A at a purchase price equal to $16.00 per share,
together with a detachable warrant in the form attached hereto as Exhibit I (the
"Warrant"). Each Warrant will (subject to adjustment) have an exercise price
equal to $5.0625 per share, and will be exercisable (subject to adjustment) into
a number of shares of Common Stock equal to 1/4 of the number of shares of
Common Stock into which the shares of Preferred Stock are initially convertible.
Pursuant to the terms of this Agreement, Additional Warrants (as hereinafter
defined) may be issued. Each share of Preferred Stock shall be convertible into
four shares of the Company's Common Stock upon approval of an increase in the
authorized number of shares of Common Stock at the special shareholders meeting
referred to in Article 7, and shall contain the terms and conditions as
specified in Exhibit II. The Purchasers will receive certain registration rights
with respect to the shares of Common Stock issuable upon conversion of the
Preferred Stock and exercise of the Warrants and Additional Warrants, if any,
pursuant to an agreement in substantially the form attached hereto as Exhibit
III (the "Registration Rights Agreement").
<PAGE>
 
     2.    Closing Date.  The closing of the purchase and sale of the Preferred
           ------------                                              
Stock hereunder (the "Closing") will be held at the offices of Dorsey & Whitney
LLP, 220 South Sixth Street, Minneapolis, Minnesota 55402 at such time and date
as the Company and the Purchasers may agree (the "Closing Date").

     3.    Delivery.  At the Closing, the Company will deliver to each Purchaser
           --------                                                   
a certificate dated the Closing Date registered in such Purchaser's name
representing the Preferred Stock purchased by such Purchaser, together with a
Warrant registered in such Purchaser's name representing the number of shares of
Common Stock purchasable upon the exercise of such Warrant. At the Closing each
Purchaser will pay to the Company the amount of the purchase price set forth
opposite the name of such Purchaser in Schedule A attached hereto by certified
check, wire transfer or any combination of the above.

     4.    Representations and Warranties of the Company.  The Company hereby
           ---------------------------------------------                     
makes the following representations and warranties to the Purchasers which
representations and warranties survive the purchase of the Preferred Stock and
Warrants by the Purchasers:

     4.1   Corporate Existence and Power.  The Company is duly incorporated,
           -----------------------------                                    
validly existing and in good standing under the laws of the State of Minnesota.
The Company's only subsidiary is Diametrics Medical, Ltd., a private limited
company incorporated in England and Wales (the "Subsidiary") and, other than in
the ordinary course of business and with respect to the Subsidiary, has made no
investment in any Person. Each of the Company and the Subsidiary has all
corporate powers and authority and all governmental licenses, authorizations,
consents and approvals (collectively, the "Permits") required to carry on its
business as now conducted, except where the failure to obtain such Permits,
individually or in the aggregate, would not have a Material Adverse Effect (as
defined below) on the Company. Each of the Company and the Subsidiary is duly
qualified to do business as a foreign corporation and is in good standing in
each jurisdiction where the character of the property owned or leased by it or
the nature of its activities makes such qualification necessary, except for
those jurisdictions where the failure to be so qualified would not, individually
or in the aggregate, have a Material Adverse Effect. The Company has made
available to Purchasers, if requested by Purchasers, true and complete copies of
the Company's articles of incorporation and bylaws as currently in effect. For
purposes of this Agreement, a "Material Adverse Effect" means, with respect to
any Person, a material adverse effect, on the condition (financial or
otherwise), business, assets or properties of such Person and its subsidiaries
taken as a whole or on the ability of such Person to perform its obligations
hereunder. For purposes of this Agreement, any reference to any event, change or
effect being "material" with respect to any Person means an event, change or
effect, whether existing or prospective, which is material in relation to the

                                      -2-
<PAGE>
 
condition (financial or otherwise), business, assets or properties of such
Person and its subsidiaries taken as a whole or on the ability of such Person to
perform its obligations hereunder. For the purposes of this Agreement, "Person"
means any individual, partnership, firm, corporation, limited liability company
or partnership, association, trust, unincorporated organization or other entity,
as well as any syndicate or group that would be deemed to be a person under
Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act").

     4.2   Corporate Authorization.  The execution, delivery and performance by
           -----------------------                                          
the Company of this Agreement, the Warrants, and the Registration Rights
Agreement and the consummation by the Company of the transactions contemplated
hereby and thereby are within the Company's corporate powers and, except for any
required approval by the Company's stockholders in connection with the
authorization of additional shares of Common Stock necessary to permit the
conversion of the Preferred Stock, have been duly authorized by all necessary
corporate action. Each of this Agreement, the Warrants and the Registration
Rights Agreement constitutes a valid and binding agreement of the Company,
enforceable against the Company in accordance with its terms except as such
enforcement may be subject to (a) bankruptcy, insolvency, reorganization,
moratorium or other similar laws now or hereafter in effect relating to
creditors' rights generally, (b) general principles of equity (whether
considered in a proceeding in equity or at law) and, (c) insofar as they relate
to indemnification provisions, the effect of federal and state securities laws
and public policy relating thereto.

     4.3   Consents; Approvals.  The execution, delivery and performance by the
           -------------------
Company of this Agreement, the Warrants and the Registration Rights Agreement
and consummation of the transactions contemplated hereby and thereby by the
Company require no action, by or in respect of, notices to, or filing with, any
governmental body, agency, official or authority or any third party, other than
those that have been or will be taken or made in a timely manner.

     4.4  Non-Contravention.  The execution, delivery and performance by the
          -----------------                                             
Company of this Agreement, the Warrants and the Registration Rights Agreement
and the consummation by the Company of the transactions contemplated hereby and
thereby do not and will not (except in the case of clauses (b), (c) and (d) of
this Section 4.4, for any such matters that, individually or in the aggregate,
have not had, and will not have, a Material Adverse Effect on the Company) (a)
contravene or conflict with the articles of incorporation or bylaws of the
Company, (b) contravene or conflict with or constitute a violation of any
provision of any law, regulation, judgment, injunction, order or decree binding
upon or applicable to the Company or any of its properties or assets, (c)
constitute a default under or give rise to a right of termination, cancellation,
restriction or acceleration of any right or obligation of the Company or to a
loss of any benefit to which the Company is entitled under any provision of any
agreement, contract or other instrument binding upon or

                                      -3-
<PAGE>
 
applicable to the Company or any of its properties or assets or any license,
franchise, permit or other similar authorization held by or applicable to the
Company, or (d) result in the creation or imposition of any Lien on any asset of
the Company. For purposes of this Agreement, "Lien" means, with respect to any
asset, any mortgage, lien, pledge, charge, security interest or encumbrance of
any kind in respect of such asset.

     4.5   Capitalization.  The authorized capital stock of the Company consists
           --------------                                              
of 20,000,000 shares of Common Stock and 5,000,000 shares of preferred stock,
par value $0.01 per share (the "Preferred Stock"). As of the date hereof (i)
15,210,614 shares of Common Stock are issued and outstanding and (ii) no shares
of Preferred Stock are issued and outstanding. As of the date hereof 2,431,570
shares of Common Stock are reserved for issuance pursuant to the exercise of
outstanding stock options and 786,814 shares of Common Stock are reserved for
issuance pursuant to the exercise of outstanding warrants. All outstanding
shares of capital stock of the Company have been duly authorized and validly
issued, are fully paid and nonassessable, are free from preemptive rights and
were issued in compliance with all state and federal securities laws. Assuming
in each case proper payment is made therefor, each share of Preferred Stock
issued to the Purchasers pursuant hereto and each share of Additional Preferred
Stock (as hereinafter defined), if any, will be, and upon the conversion of the
Preferred Stock, the Additional Preferred Stock, if any, and/or exercise of the
Warrants, each share of Common Stock issued in respect thereof will be, duly
authorized, validly issued and outstanding, fully paid and nonassessable, free
from preemptive rights and issued in compliance with all state and federal
securities laws. Except as set forth in this Section, there are outstanding (a)
no other shares of capital stock or other voting securities of the Company, (b)
no securities of the Company convertible into or exchangeable for shares of
capital stock or voting securities of the Company, and (c) no other options or
other rights to acquire from the Company, and no obligation of the Company to
issue, any capital stock, voting securities or securities convertible into or
exchangeable for capital stock or voting securities of the Company (the items in
clauses (a), (b) and (c) being referred to collectively as the "Company
Securities"). There are no outstanding obligations of the Company to repurchase,
redeem or otherwise acquire any Company Securities.

     4.6   SEC Filings.
           ----------- 

           (a)  The Company has filed all required reports, schedules, forms,
     statements and other documents filed or required to be filed by the Company
     with the Securities and Exchange Commission (the "SEC") since January 1,
     1995. The Company has delivered to Purchasers (i) the annual reports on
     Form 10-K for its fiscal year ended 1995 (ii) its quarterly report on Form
     10-Q for its fiscal quarter ended September 30, 1996, (iii) its proxy or
     information statements relating to meetings of, or actions taken without a
     meeting by, the

                                      -4-
<PAGE>
 
     stockholders of the Company held since January 1, 1996, and (iv) all of its
     other reports, statements, schedules and registration statements filed by
     the Company with the SEC since January 1, 1996 (collectively, "SEC
     Reports").

           (b)  Except to the extent that information contained in any SEC
     Report has been revised or superseded by a later-filed SEC Report, filed
     and publicly available prior to the date of this Agreement, as of the date
     of this Agreement, none of the SEC Reports contains any untrue statement of
     a material fact or omits 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. As of their
     respective dates, the SEC Reports complied as to form in all material
     respects with the requirements of the Securities Act of 1933, as amended,
     (the "Securities Act"), or the Exchange Act, as the case may be, and the
     rules and regulations of the SEC promulgated thereunder applicable to such
     SEC Reports.

     4.7   Financial Statements.
           -------------------- 

           (a)  Except to the extent that information contained in any SEC
     Report has been revised or superseded by a later-filed SEC Report, filed
     and publicly available prior to the date of this Agreement, the audited
     financial statements and unaudited interim financial statements of the
     Company included in its annual reports on Form 10-K and the quarterly
     reports on Form 10-Q referred to in Section 4.6 are true and correct and
     fairly present, in conformity with generally accepted accounting
     principles, applied on a consistent basis (except as may be indicated in
     the notes thereto), the financial position of the Company as of the dates
     thereof and results of operations and changes in financial position for the
     periods then ended (subject to non-material normal year-end adjustments in
     the case of any unaudited interim financial statements). For purposes of
     this Agreement "Balance Sheet" means the Company's balance sheet as of
     September 30, 1996, including the notes thereto, as set forth in the
     Company's 10-Q referred to in Section 4.6 and "Balance Sheet Date" means
     the date of the Balance Sheet.

           (b)  Except and to the extent set forth in the Balance Sheet, the
     Company does not have any liability or obligation of any nature (whether
     accrued, absolute, contingent or otherwise), except for liabilities and
     obligations incurred after the Balance Sheet Date in the ordinary course of
     business which would not, individually or in the aggregate, have a Material
     Adverse Effect on the Company.

                                      -5-
<PAGE>
 
     4.8   Disclosure Documents.
           -------------------- 

           (a)  Each document required to be filed by the Company with the SEC
     in connection with the transactions contemplated by this Agreement (the
     "Company Disclosure Documents"), will, when filed, comply as to form in all
     material respects with the applicable requirements of the Exchange Act.

           (b)  The Company Disclosure Documents will not contain any untrue
     statement of a material fact or omit to state any material fact necessary
     in order to make the statements made therein, in the light of the
     circumstances under which they were made, not misleading. The
     representations and warranties contained in this Section 4.8 will not apply
     to statements or omissions included in the Company Disclosure Documents
     based upon information furnished to the Company in writing by Purchasers
     specifically for use therein.

     4.9   Intellectual Property.  Each of the Company and the Subsidiary owns 
           --------------------- 
or has the right to use (without material payment) the Intellectual Property (as
defined below) as is necessary or appropriate for the conduct of its business as
it is now being conducted, as it is anticipated to be conducted and with respect
to the transactions contemplated by this Agreement (collectively, the "Company
Intellectual Property"). To the Company's knowledge after due inquiry, no
infringement or unauthorized use by the Company or the Subsidiary of any
Intellectual Property of any third party exists, has occurred or is threatened.
Other than as disclosed in the Company's reports or statements previously filed
pursuant to the Exchange Act, no current or former shareholder, officer,
director, consultant, employee or affiliate of the Company or the Subsidiary has
any right, title or interest in any Company Intellectual Property. For the
purposes of this Agreement, "Intellectual Property" means any and all of a
Person's right, title and interest in and to United States and foreign patents,
copyrights, mask works, trade and service names and marks, whether or not
registered, pending, issued or applied for; technical knowledge; works,
processes and designs; hardware; software (in source code and object code form,
including all related annotations and listings); inventions; trade secrets and
other intellectual property rights; all things authored, made for hire,
discovered, developed, designed or acquired by a Person or, to the extent that a
Person has any right, title or interest thereto, any of their respective agents,
contractors and employees in any stage of development, regardless of whether any
or all of the foregoing constitutes copyrightable or patentable subject matter
or is in tangible or intangible form; and all embodiments, expressions,
representations, fruits and products of any of the foregoing.

                                      -6-
<PAGE>
 
     4.10  Absence of Certain Changes.  Since the Balance Sheet Date, the 
           --------------------------        
Company has conducted its business in the ordinary course consistent with past
practice and there has not been:

           (a)  any event, occurrence or development which has had or reasonably
     could be expected to have a Material Adverse Effect on the Company; or

           (b)  any declaration, setting aside or payment of any dividend or
     other distribution with respect to any shares of capital stock of the
     Company or any repurchase, redemption or other acquisition by the Company
     of any outstanding shares of capital stock or other securities of, or other
     ownership interests in, the Company.

     4.11  Litigation.  There is no action, suit, investigation or proceeding 
           ----------                                                        
(or any basis therefor) pending against or, to the knowledge of the Company,
threatened against or affecting, the Company or the Subsidiary or any of its
properties before any court or arbitrator or any governmental body, agency or
official which, if determined or resolved adversely to the Company or the
Subsidiary, could reasonably be expected to have a Material Adverse Effect on
the Company, nor is there any judgment, decree, injunction, rule or order of any
court, governmental department, commission, agency, instrumentality or
arbitrator outstanding against the Company or the Subsidiary having, or which,
insofar as can reasonably be foreseen, may have, any such effect.

     4.12  Compliance with Laws and Agreements.  Except as disclosed in the SEC
           -----------------------------------                                 
Reports and except in the case of clauses (b), (c) and (d) for breaches,
violations and defaults which in the aggregate do not, and insofar as reasonably
can be foreseen could not, have a Material Adverse Effect on the Company,
neither the Company nor the Subsidiary is in violation of, nor has it violated,
nor to the best knowledge is it under investigation with respect to, nor has it
received notice or been charged with any violation of, any applicable provisions
of any laws, statutes, ordinances or regulations. Neither the Company nor the
Subsidiary is in breach or violation of or in default in the performance or
observance of any term or provision of, and no event has occurred which, with
lapse of time or action by a third party, could result in a default under, (a)
the articles of incorporation, bylaws or similar governing documents of the
Company or the Subsidiary, (b) any contract, commitment, agreement, indenture,
mortgage, loan agreement, note, lease, bond, license, approval or other
instrument to which the Company or the Subsidiary is a party or by which it is
bound or to which any of its property is subject, (c) any order, writ,
injunction, decree, statute, rule or regulation applicable to the Company or the
Subsidiary or any of their respective properties or assets, or (d) any
certificate, license, Permit, registration, accreditation or other consent or
approval of governmental agencies or accreditation organizations.

                                      -7-
<PAGE>
 
     4.13  Finders' Fees.  There is no investment banker, broker, finder or 
           -------------                           
other intermediary which has been retained by or is authorized to act on behalf,
of the Company who might be entitled to any fee or commission upon consummation
of the transactions contemplated by this Agreement.

     4.14  Full Disclosure; No Misrepresentations.  No information contained in
           --------------------------------------                              
the representations and warranties of the Company set forth in this Agreement or
in any of the certificates, schedules, lists, documents, exhibits or other
instruments relating hereto or to be delivered to Purchasers hereunder contains
any untrue statement of a material fact or omits to state a material fact
necessary to make the statement contained herein or therein, in light of the
circumstances under which they were made, not misleading. To the knowledge of
the Company, there is no fact or condition which has not been heretofore
disclosed to Purchasers in writing which has a Material Adverse Effect on the
Company, or reasonably could be expected to have a Material Adverse Effect on
the Company.

     5.    Representations and Warranties of the Purchasers.  Each Purchaser
           ------------------------------------------------                 
hereby makes the following representations and warranties to the Company which
representations and warranties survive the issuance of the Preferred Stock and
Warrants by the Company:

     5.1   Availability of Information.  Purchaser has been given access to full
           ---------------------------                                          
and complete information regarding the Company (including the opportunity to
meet with officers of the Company and review such documents as it may have
requested in writing) and has utilized such access to its satisfaction for the
purpose of obtaining information.

     5.2   Risk of Investment. Purchaser:
           ------------------              

           (a)  realizes that the purchase of the Preferred Stock and Warrants
                represents a speculative investment involving a high degree of
                risk;

           (b)  can bear the economic risk of an investment in the Preferred
                Stock and Warrants for an indefinite period of time, can afford
                to sustain a complete loss of such investment, has no need for
                liquidity in connection with an investment in the Preferred
                Stock and Warrants; and can afford to hold the Preferred Stock
                and Warrants indefinitely;

           (c)  realizes that the Preferred Stock and Warrants have not been
                registered for sale under the Securities Act or applicable state
                securities laws (the "State Laws"), and may be sold only
                pursuant

                                      -8-
<PAGE>
 
                to registration under the Securities Act and State Laws, or an
                opinion of counsel that such registration is not required; and

           (d)  is experienced and knowledgeable in financial and business
                matters, capable of evaluating the merits and risks of investing
                in the Preferred Stock and Warrants, and does not need or desire
                the assistance of a knowledgeable representative to aid in the
                evaluation of such risks.

     5.3   Investment Intent.
           ----------------- 

           (a)  Purchaser acknowledges that it has been advised that the
                Preferred Stock and Warrants are being offered and sold pursuant
                to exemptions from the Securities Act and applicable State Laws,
                and the Company's reliance upon such exemptions is predicated in
                part on Purchaser's representations contained herein.

           (b)  The Preferred Stock and Warrants are being purchased for
                Purchaser's own account and for investment and without the
                current intention of reselling or redistributing the Preferred
                Stock.

           (c)  Purchaser has made no agreement with others regarding any of the
                Preferred Stock or Warrants.

           (d)  Purchaser acknowledges that the shares of Preferred Stock and
                the shares of Common Stock into which the Preferred Stock is
                convertible are further restricted by a legend placed on the
                certificate representing the Preferred Stock and/or Common Stock
                containing substantially the following language:

                "The securities represented by this certificate have not been
                registered under either the Securities Act of 1933 or applicable
                state securities laws and may not be sold, transferred,
                assigned, offered, pledged or otherwise distributed for value
                unless there is an effective registration statement under such
                Act and such laws covering such securities, or the Company
                receives an opinion of counsel acceptable to the Company stating
                that such sale, transfer, assignment, offer, pledge or other
                distribution for value is exempt from the registration and
                prospectus delivery requirements of such Act and such laws."

                                      -9-
<PAGE>
 
     5.4   Residence.  The principal office or residence of each Purchaser is
           ---------                                                         
located at the address set forth in Schedule A.

     5.5   Accredited Status .  Each Purchaser is an "accredited investor" as
           ------------------                                                
that term is defined under Regulation D promulgated pursuant to the Securities
Act.

     6.    Covenant of Purchasers.  Each Purchaser agrees that if such Purchaser
           ----------------------                                               
should later desire to dispose of or transfer any of the Preferred Stock or
Warrants in any manner, Purchaser shall not do so without first obtaining (i) an
opinion of counsel satisfactory to the Company that such proposed disposition or
transfer may be made lawfully without the registration of such Preferred Stock
pursuant to the Securities Act and applicable State Laws, or (ii) registration
of such Preferred Stock pursuant to the Securities Act and applicable State
Laws.

     7.    Affirmative Covenants of the Company.  The Company covenants to each
           ------------------------------------                                
of the Purchasers as follows:

     7.1   Special Shareholder Meeting.  The Company will, as soon as reasonable
           ---------------------------                                          
and practicable, properly call a special shareholders meeting to approve an
increase in the authorized capital stock of the Company in an amount sufficient
to allow the conversion of all of the shares of Preferred Stock purchased
pursuant to this Agreement and the Additional Preferred Stock, if any, into
shares of Common Stock. The Company shall use its best efforts to cause the
shareholders to approve such increase. Pursuant to the terms specified in
Exhibit II to this Agreement, neither the Preferred Stock nor the Additional
Preferred Stock, if any, shall be convertible into Common Stock unless and until
such approval is obtained. If such approval is not obtained within six months of
the Closing Date, the Company will use its best efforts to seek to have the
shares of Preferred Stock and the Additional Preferred Stock (as hereinafter
defined), if any, listed for inclusion on the automated quotation system of the
National Association of Securities Dealers, Inc. or any national securities
exchange on which a class of the Company's equity securities is listed.

     7.2   Additional Warrants.  The Company will issue additional warrants (the
           -------------------                                                  
"Additional Warrants") to the Purchasers exercisable for 187,500 shares of
Series I Junior Participating Preferred Stock (the "Additional Preferred Stock")
at a per share purchase price equal to $20.25 in the event that the Company
breaches its obligations set forth in Section 3 of the Registration Rights
Agreement. The Company will take all necessary corporate and other action in
connection with such issuance.

     7.3   Reservation of Capital Stock.  The Company shall reserve and maintain
           ----------------------------                                         
a sufficient number of shares of Common Stock for issuance upon conversion of
all of the outstanding shares of Preferred Stock and Additional

                                     -10-
<PAGE>
 
Preferred Stock, if any, and exercise of all Warrants; provided, however, that
                                                       -----------------      
in the case of the Preferred Stock and the Additional Preferred Stock, if any,
such reservation shall be subject to the approval by the shareholders of the
Company of an increase in the authorized capital stock of the Company in an
amount sufficient to allow the conversion of the Preferred Stock and the
Additional Preferred Stock, if any. The Company shall reserve and maintain a
sufficient number of shares of preferred stock for issuance upon exercise of the
Additional Warrants, if any.

     7.4   Additional Covenants.  For the period commencing on the Closing Date
           --------------------                                                
and ending on the later of the conversion of all of the Preferred Stock and the
Additional Preferred Stock, if any, into Common Stock or the date that the
registration statement described in Section 3 of the Registration Rights
Agreement is declared effective by the SEC, the Company covenants to each of the
Purchasers as follows:

           (a)  The Company will promptly pay and discharge, or cause to be paid
     and discharged, when due and payable, all lawful Taxes imposed upon the
     income, profits, property, or business of the Company or any of its
     subsidiaries; provided, however, that any such Tax need not be paid if the
                   --------  -------                                           
     validity thereof shall currently be contested in good faith by appropriate
     proceedings and if the Company or any such subsidiary, as the case may be,
     shall have set aside on its books adequate reserves therefor; and provided,
                                                                       -------- 
     further, that the Company or any such subsidiary, as the case may be, will
     -------                                                                   
     pay all such Taxes forthwith upon the commencement of proceedings to
     foreclose any lien that may have attached as security therefor.  The
     Company will promptly pay or cause to be paid when due, or in conformance
     with customary trade terms, all other indebtedness incident to the
     operations of the Company or its subsidiaries.  For purposes of this
     Agreement, "Taxes" shall mean all taxes, charges, fees, levies or other
     assessments, including, without limitation, all net income, gross income,
     gross receipts, sales, use, ad valorem, goods and services, capital,
                                 ----------                              
     transfer, franchise, profits, license, withholding, payroll, employment,
     employer health, excise, estimated, severance, stamp, occupation, property
     or other taxes, customs duties, fees, assessments or charges of any kind
     whatsoever, together with any interest and any penalties, additions to tax
     or additional amounts imposed by any taxing authority;

           (b)  The Company will keep, and will cause each of its subsidiaries
     to keep, its properties in good repair, working order, and condition,
     reasonable wear and tear excepted, and from time to time make all necessary
     and proper repairs, renewals, replacements, additions, and improvements
     thereto; and the Company will at all times, and will cause each of its
     subsidiaries to, comply with the provisions of all material leases to which
     it is a party or

                                     -11-
<PAGE>
 
     under which it occupies property so as to prevent any loss or forfeiture
     thereof or thereunder;

           (c)  The Company will keep, and will cause each of its subsidiaries
     to keep, its assets that are of an insurable character insured by
     financially sound and reputable insurers against loss or damage by fire,
     extended coverage, and explosion insurance in amounts customary for
     companies in similar businesses similarly situated; and the Company will
     maintain, and will cause each of its subsidiaries to maintain, with
     financially sound and reputable insurers, insurance against other hazards,
     risks, and liabilities to persons and property to the extent and in the
     manner customary for companies in similar businesses similarly situated;

           (d)  The Company will keep, and will cause its subsidiaries to keep,
     true records and books of account in which full, true and correct entries
     will be made of all dealings or transactions in relation to its business
     and affairs in accordance with generally accepted accounting principles;

           (e)  The Company will comply, and will cause its subsidiaries to
     comply, with the requirements of all applicable provisions of any laws,
     statutes, ordinances or regulations, a breach of which could have a
     Material Adverse Effect;

           (f)  The Company shall, and shall cause each of its subsidiaries to,
     maintain in full force and effect its corporate existence, rights, and
     franchises and all licenses and other rights to use patents, processes,
     licenses, trademarks, trade names, or copyrights owned or possessed by it
     and deemed by the Company to be necessary to the conduct of its business.

           (g)  The Company shall require all persons now or hereafter employed
     by the Company who have access to confidential and proprietary information
     of the Company to enter into agreements of confidentiality. The Company
     will cause its subsidiaries to use reasonable efforts to require all
     persons hereafter employed by such subsidiaries who have access to
     confidential and proprietary information of the Company or any such
     subsidiary to enter into agreements of confidentiality.

     7.5   Purchasers' Rights in Any Future Private Financing.  For a period
           --------------------------------------------------               
commencing on the date of this Agreement and ending on the fifth anniversary of
this Agreement, in the event of any proposed sale of securities of the Company
(including, without limitation, the sale of Common Stock, preferred stock,
convertible securities and debt instruments, other than commercial loans or
extensions of credit made by a bank, insurance company or other third-party
financial institution), other than pursuant to grants of employee stock options,

                                     -12-
<PAGE>
 
warrants in lieu of compensation, performance warrants and similar arrangements
and shares issued upon the exercise of stock options and warrants outstanding as
of the date of this Agreement, each Purchaser shall be provided at least 30
days' advance notice and have the right to invest in such sale of securities, on
the same terms as offered to any third party, in a percentage amount based on
such Purchaser's pro rata investment in the Preferred Stock sold pursuant to
this Agreement; provided, however, that such right does not include any sale of
                -----------------                                              
the Company's equity securities in connection with a public offering pursuant to
a registration statement filed with the SEC.

     7.6   Transfer of Registered Stock.  Following effectiveness of a
           ----------------------------                               
registration statement filed with the SEC pursuant to Section 3 of the
Registration Rights Agreement, upon attempted transfer of securities registered
under such registration statement pursuant to the terms of the Registration
Rights Agreement and in accordance with applicable laws, rules and regulations,
the Company will, as promptly as practicable following receipt of all
documentation reasonably requested by the Company from the transferor, take all
action necessary to cause its transfer agent to permit transfer of such
securities without restrictive legend.

     8.    Conditions to Closing.
           --------------------- 

           8.1  Conditions to Purchasers' Obligations at the Closing.  The
                ----------------------------------------------------      
obligations of each Purchaser to purchase the Preferred Stock at the Closing are
subject to the fulfillment on or before the Closing of each of the following
conditions, the waiver of which shall not be effective against any Purchaser who
does not consent in writing thereto:

           (a)  The representations and warranties made by the Company in
                Section 4 hereof shall be true and correct in all material
                respects as of the Closing Date with the same force and effect
                as if they had been made as of the Closing Date, and the Company
                shall have performed all obligations and conditions herein
                required to be performed or observed by it on or prior to the
                Closing.

           (b)  On the Closing Date, the sale and issuance of the Preferred
                Stock and Warrants and the proposed issuance of the Company's
                Common Stock upon conversion of the Preferred Stock or exercise
                of the Warrants shall be legally permitted by all laws and
                regulations to which Purchasers and the Company are subject.

           (c)  The Registration Rights Agreement shall have been executed and
                delivered by the parties thereto.

                                     -13-
<PAGE>
 
           (d)  The Purchasers shall have received on the Closing Date, a
                certificate or certificates of the chief executive officer and
                the chief financial officer of the Company to the effect that,
                as of such Closing Date, each of them severally represents that
                the representations and warranties of the Company set forth in
                Section 4 of this Agreement are true and correct in all material
                respects as of the Closing Date and the Company has performed
                all of its obligations under this Agreement to be performed at
                or prior to such Closing Date.

           (e)  The Purchaser shall have received on the Closing Date the
                opinion of Dorsey & Whitney LLP, counsel for the Company, dated
                the Closing Date substantially in the form attached hereto as
                Exhibit IV.

           (f)  A copy of (i) the Articles of Incorporation, as amended, of the
                Company, certified by the secretary of state of Minnesota, as of
                a date not earlier than ten (10) business days prior to the
                Closing Date and accompanied by a certificate of the Secretary
                or Assistant Secretary of the Company, dated as of the Closing
                Date, stating that no amendments have been made to such Articles
                of Incorporation since the date of the last filing indicated in
                the secretary of states' certificate, and (ii) the By-laws of
                the Company, certified by the Secretary or Assistant Secretary
                of the Company, each of which to be in the form and substance as
                previously made available to the Purchasers pursuant to Section
                4.1.

           (g)  Good standing certificates for the Company from the Secretary of
                State of Minnesota and the Secretary of State of each
                jurisdiction in which it is qualified to do business in each
                case dated as of the date not earlier than five (5) business
                days prior to the Closing Date.

           (h)  A certificate signed by a duly authorized officer of the Company
                certifying that since the Balance Sheet Date no event or events
                has occurred, or is reasonably likely to occur, which,
                individually or in the aggregate, has, or could reasonably be
                expected to have, a Material Adverse Effect.

           (i)  Evidence reasonably satisfactory to the Purchasers that the
                Certificate of Designation (Exhibit II) has been filed with the
                Secretary of State of Minnesota.

                                     -14-
<PAGE>
 
           8.2  Conditions to Obligations of the Company.  The obligations of 
                ---------------------------------------- 
the Company to each Purchaser under this Agreement are subject to the
fulfillment on or before the Closing of each of the following conditions by each
Purchaser:

           (a)  The representations and warranties made by the Purchasers in
                Section 5 hereof shall be true and correct in all material
                respect at the Closing Date with the same force and effect as if
                they had been made on and as of said date.

           (b)  The Purchasers shall have performed and complied with all
                agreements and conditions herein required to be performed or
                complied with by the Purchasers on or before the Closing.

9.   Indemnification of Purchasers.
     ----------------------------- 

     9.1   Survival.  All agreements, covenants, representations and warranties
           --------                                                            
contained herein and made in writing by or on behalf of the parties hereto in
connection with the transactions contemplated hereby shall survive the execution
and delivery of this Agreement and the consummation of the transactions
contemplated hereby and shall survive until the fifth anniversary of the date of
this Agreement (the "Indemnity Period").

     9.2   Purchasers' Right to Indemnification.  Subject to the provisions of
           ------------------------------------                               
this Section 9, the Company hereby agrees to indemnify and hold harmless
Purchasers, and their respective employees, agents, directors, officers,
successors, predecessors and assigns (collectively, the "Purchaser Indemnified
Parties") from and against (i) any and all losses, obligations, liabilities,
damages, claims, deficiencies, costs and expenses (including, but not limited
to, the amount of any settlement entered into pursuant hereto and all reasonable
legal and other expenses incurred in connection with the investigation,
prosecution or defense of the matter but excluding consequential damages)
(collectively, "Claims"), which may be asserted against or sustained or incurred
by the Purchaser Indemnified Parties in connection with, arising out of, or
relating to (A) any breach or alleged breach of any of the representations,
warranties, agreements and covenants made by the Company herein or in any
certificate or other document delivered to any Purchaser Indemnified Party by or
on behalf of the Company in connection with this Agreement; or (B) any false,
incorrect or misleading representation or warranty made by or on behalf of the
Company herein or in any certificate or other document delivered to any
Purchaser Indemnified Party by or on behalf of the Company in connection with
this Agreement; and (ii) any and all costs and expenses (including, but not
limited to, reasonable legal expenses) incurred by any Purchaser Indemnified
Party in connection with the enforcement of its rights under this Agreement. No
claim for indemnification under Section 9 may be commenced after the Indemnity
Period; provided, however, that claims made within the applicable time period
        -----------------                                                    
shall

                                     -15-
<PAGE>
 
survive to the extent of such claim until such claim is finally determined and,
if applicable, paid. The parties to this Agreement acknowledge that such
indemnification provisions apply only with respect to the Preferred Stock, the
Warrants, the Additional Warrants (if any) and the shares of Common Stock
issuable upon the conversion of the Preferred Stock and/or exercise of the
Warrants and the Additional Warrants, if any, and the shares of Common Stock
issued or issuable as dividends on, or other distributions with respect to the
Preferred Stock, the Warrants, the Additional Warrants (if any) and the shares
of Common Stock issuable upon the conversion of the Preferred Stock and/or
exercise of the Warrants and the Additional Warrants; and any other security
issued or issuable in exchange for, or in replacement of, the Preferred Stock,
the Warrants, the Additional Warrants (if any) and the shares of Common Stock
issuable upon the conversion of the Preferred Stock and/or exercise of the
Warrants and the Additional Warrants.

     9.3   Procedure for Claims.
           -------------------- 

           (a)  Notice of Claim.  Promptly, but in any event within 10 days 
                --------------- 
     after obtaining knowledge of any claim or demand which may give rise to, or
     could reasonably give rise to, a claim for indemnification hereunder
     (referred to herein as an "Indemnification Claim"), a Purchaser shall give
     written notice to the Company of such Indemnification Claim ("Notice of
     Claim"). A Notice of Claim shall be given with respect to all
     Indemnification Claims; provided, however, that the failure to give a
                             -----------------
     timely Notice of Claim to the Company shall not relieve the Company from
     any liability that it may have to the Purchaser Indemnified Parties
     hereunder to the extent that the Company is not prejudiced by such failure.
     The Notice of Claim shall set forth the amount (or a reasonable estimate)
     of the loss, damage or expense suffered, or which may be suffered, by the
     Purchaser Indemnified Party as a result of such Indemnification Claim and
     the aggregate amount of all Indemnification Claims to date and a brief
     description of the facts giving rise to such Indemnification Claim.
     Purchasers shall furnish to the Company such information (in reasonable
     detail) as Purchasers may have with respect to such Indemnification Claim
     (including copies of any summons, complaint or other pleading which may
     have been served on it and any written claim, demand, invoice, billing or
     other document evidencing or asserting the same).

     (b)   Third Party Claims.
           ------------------ 

                (i)   If the claim or demand set forth in the Notice of Claim is
           a claim or demand asserted by a third party (a "Third Party Claim"),
           the Company shall have fifteen days (or such shorter period (but not
           less than ten days) if an answer or other response or filing with
           respect to the pleadings served by the third party is required prior
           to the fifteenth

                                     -16-
<PAGE>
 
           day) after the date of receipt by the Company of the Notice of Claim
           (the "Notice Date") to notify Purchasers in writing of the election
           by the Company to defend the Third Party Claim on behalf of the
           Purchaser Indemnified Parties.

                (ii)  If the Company elects to defend a Third Party Claim on
           behalf of the Purchaser Indemnified Parties, Purchasers shall make
           available to the Company and its agents and representatives all
           records and other materials in Purchasers' possession which are
           reasonably required in the defense of the Third Party Claim and the
           Company shall pay any expenses payable in connection with the defense
           of the Third Party Claim as they are incurred (whether incurred by
           Purchasers or the Company).

                (iii) If the Company has assumed control of the defense, the
           Company may contest or settle the Third Party Claim on such terms as
           the Company may choose, provided, however, that the Company will not
                                   -----------------                           
           have the right, without Purchasers' prior written consent, to settle
           any such claim if such settlement (i) arises from or is part of any
           criminal action, suit or proceeding (ii) contains a stipulation to,
           confession of judgment with respect to, or admission or
           acknowledgment of, any liability or wrongdoing on the part of any
           Purchaser Indemnified Party, (iii) relates to any foreign federal,
           state or local tax matters, (iv) provides for injunctive relief, or
           other relief other than damages, which is binding on any Purchaser
           Indemnified Party, (v) does not fully release all Purchaser
           Indemnified Parties with respect to the relevant Third Party Claim or
           (vi) has any res judicata or collateral estoppel effect that could be
           adverse to any Purchaser Indemnified Party.

                (iv)  If the Company elects to defend a Third Party Claim, the
           Purchaser Indemnified Parties shall have the right to participate in
           the defense of the Third Party Claim, at the Purchaser Indemnified
           Parties' expense (and without the right to indemnification for such
           expense under this Agreement); provided, however, that the reasonable
                                          -----------------                     
           fees and expenses of counsel retained by the Purchaser Indemnified
           Parties shall be at the expense of the Company if (A) the use of the
           counsel chosen by the Company to represent the Purchaser Indemnified
           Parties would present such counsel with a conflict of interest; (B)
           the parties to such proceeding include both Purchaser Indemnified
           Parties and the Company and there may be legal defenses available to
           Purchaser Indemnified Parties which are different from or additional
           to those available to the Company; (C) within ten days after being
           advised by the Company of the identity of counsel to be retained to
           represent

                                     -17-
<PAGE>
 
           Purchaser Indemnified Parties, Purchasers shall have objected to the
           retention of such counsel for valid reasons (which shall be stated in
           a written notice to the Company), and the Company shall not have
           retained different counsel reasonably satisfactory to Purchasers; or
           (iv) the Company shall authorize the Purchaser Indemnified Parties to
           retain separate counsel at the expense of the Company.

                (v)   If the Company elects to defend a Third Party Claim, and
           does not defend a Third Party Claim in good faith, the Purchaser
           Indemnified Parties shall have the right, in addition to any other
           right or remedy it may have hereunder, at the sole and exclusive
           expense of the Company, to defend such Third Party Claim; provided,
                                                                     --------
           however, that such expenses shall be payable by the Company only if
           -------                                                            
           and when such Third Party Claim becomes payable.

           (c)  Cooperation in Defense.  Purchasers shall cooperate with the
                ----------------------                                      
     Company in the defense of Third Party Claims. Subject to the foregoing, (i)
     the Purchaser Indemnified Parties shall not have any obligation to
     participate in the defense of or to defend any Third Party Claim and (ii)
     the Purchaser Indemnified Parties' defense of or its participation in the
     defense of any Third Party Claim shall not in any way diminish or lessen
     its right to indemnification as provided in this Agreement.

     10.   Entire Agreement.  This Agreement and the other documents referenced
           ----------------                                                    
herein contain the entire agreement between the parties with respect to the
subject matter hereof and supersede any and all prior arrangements and
understandings, both written and oral, with respect thereto.

     11.   Severability.  It is the desire and intent of the parties that the
           ------------                                                      
provisions of this Agreement be enforced to the fullest extent permissible under
the law and public policies applied in each jurisdiction in which enforcement is
sought. Accordingly, in the event that any provision of this Agreement would be
held in any jurisdictions to be invalid, prohibited or unenforceable for any
reason, such provision, as to such jurisdiction, shall be ineffective, without
invalidating the remaining provisions of this Agreement or affecting the
validity or enforceability of such provision in any other jurisdiction.
Notwithstanding the foregoing, if such provision could be more narrowly drawn so
as not to be invalid, prohibited or unenforceable in such jurisdiction, it
shall, as to such jurisdiction, be so narrowly drawn without invalidating the
remaining provisions of this Agreement or affecting the validity or
enforceability of such provision in any other jurisdiction.

     12.   Successors and Assigns.  The provisions of this Agreement shall be
           ----------------------                                            
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns, provided that no party may assign, delegate or otherwise

                                     -18-
<PAGE>
 
transfer any of its rights or obligations under this Agreement without obtaining
the prior written consent of the other party hereto.

     13.   Governing Law.  This Agreement shall be construed in accordance with
           -------------                                                       
and governed by the law of the State of Minnesota, without giving effect to the
principles of conflict of laws thereof.

     14.   Counterparts; Effectiveness.  This Agreement may be signed in any
           ---------------------------                                      
number of counterparts, each of which shall be an original, with the same effect
as if the signatures thereof and hereto were upon the same instrument. This
Agreement shall become effective when each party hereto shall have received
counterparts hereof signed by all of the other parties hereto.

     15.   Notice.  Whenever a party to this Agreement is required to give 
           ------                                                          
notice to the other party hereunder at the address set forth in this paragraph,
such notice shall be made in writing and deemed to have been duly delivered when
(a) delivered by hand, (b) one day after upon confirmation of delivery by a
national recognized overnight delivery service, (c) three days after sent by
Certified U.S. Mail, return receipt requested or (d) by telecopy when received.
The address for notices given hereunder shall be: if to a Purchaser, at the
address set forth on Schedule A hereto, and if to the Company, at 2658 Patton
Road, Roseville, Minnesota 55113, Attention: President (telecopy: (612) 639-
8549), or at such other address as the parties designate to each by giving
notice hereunder.

     16.   Expenses.  Except as otherwise specified in this Agreement, all costs
           --------                                                             
and expenses, including, without limitation, fees and disbursements of counsel,
financial advisors and accountants, incurred in connection with this Agreement
and the transactions contemplated hereby shall be paid by the party incurring
such costs and expenses; provided, however, that the Company shall pay the fees
                         -----------------                                     
and costs of Neal, Gerber & Eisenberg relating to this Agreement and the
transactions contemplated hereby.

                                     -19-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                         DIAMETRICS MEDICAL, INC.


                                         By /s/ Laurence L. Betterley
                                            ----------------------------------
                                            Its  Chief Financial Officer
                                               -------------------------------



                                         PURCHASERS:

                                         [SIGNATURES OF PURCHASERS]

<PAGE>
 
                                                                     EXHIBIT 4.2

                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------

 
     Registration Rights Agreement (the "Agreement"), dated as of January 30,
1997, by and between Diametrics Medical, Inc., a Minnesota corporation (the
"Company"), and the Persons whose signatures appear on the signature pages
hereto as of the date hereof or hereafter.

                               R E C I T A L S:
                               --------------- 

     A.  This Agreement is made pursuant to the Stock Purchase Agreement dated
as of the date hereof (the "Purchase Agreement") between the Company and the
purchasers signatories thereto (the "Purchasers").  Capitalized terms not
otherwise defined herein shall have the meanings set forth in the Purchase
Agreement.

     B.  The Purchase Agreement provides, among other things, for the sale and
issuance by the Company to the Purchasers of units each consisting of (i) one
share of the Company's Series I Junior Participating Preferred Stock, par value
$0.01 per share (the "Preferred Stock"), and (ii) a detachable warrant to
purchase one share of common Stock for each share of Preferred Stock purchased
(the "Warrants").  The Purchase Agreement also provides for the issuance of
certain additional warrants under certain circumstances (the "Additional
Warrants") for the purchase of additional shares of the Company's Series I
Junior Participating Preferred Stock, par value $0.01 per share (the "Additional
Preferred Stock").  Each share of Preferred Stock is, and each share of
Additional Preferred Stock, if any, will be, convertible (subject to approval of
the stockholders of the Company for the authorization of additional shares of
Common Stock sufficient to accommodate the conversion of the Preferred Stock)
into four shares (subject to adjustment) of Common Stock as provided in the
Certificate of Designation relating to the Preferred Stock.

     C.  In order to induce the Purchasers to enter into and perform its
obligations under the Purchase Agreement, the Company has agreed to provide the
registration rights set forth in this Agreement.

     NOW,THEREFORE, the parties hereby agree as follows:

     1.  Definitions.
         ----------- 

     In addition to terms defined elsewhere in this Agreement, as used in this
Agreement, the following capitalized terms shall have the following meanings:

         "Common Stock" means the common stock of the Company, $0.01 per share.
          ------------                                                         
<PAGE>
 
         "Exchange Act" means the Securities Exchange Act of 1934, as amended,
          ------------                                                        
or any similar or successor federal statute and the rules and regulations of the
SEC promulgated thereunder, all as the same shall be in effect at the time.

         "Holder" means any Person who executes a counterpart of this Agreement
          ------  
on or after the date hereof and any Person who becomes a Holder after the date
of this Agreement pursuant to Paragraph 14(a).

         "Indemnified Party" has the meaning set forth in Paragraph 8(c).
          -----------------                                              

         "Indemnifying Party" has the meaning set forth in Paragraph 8(c).
          ------------------                                              

         "NASD" means the National Association of Securities Dealers, Inc.
          ----                                                            

         "Person" means an individual, partnership, corporation, limited
          ------                                                        
liability company, trust or unincorporated organization, or a government or
agency or political subdivision thereof, or any other entity of any kind.

         "Registered Securities" means Registrable Securities which have been
          ---------------------                                              
registered under the Securities Act pursuant to a registration statement filed
with and declared effective by the SEC.

         "Registrable Securities" means (i) the Shares; (ii) the shares of
          ----------------------   
Common Stock issued or issuable as dividends on, or other distributions with
respect to the Shares; and (iii) any other security issued or issuable in
exchange for, or in replacement of, any of the Shares, in each case until any
such security ceases to be a Registrable Security in accordance with Paragraph 2
hereof.

         "Registration Expenses" means all expenses (excluding Selling Expenses)
          ---------------------                                                 
incident to the Company's performance of or compliance with Paragraphs 3, 4 and
5 of this Agreement, including without limitation all registration and filing
fees, including fees with respect to filings required to be made with any stock
exchange or the NASD, fees and expenses of compliance with state securities or
blue sky laws (including reasonable fees and disbursements of counsel in
connection with blue sky qualifications of the Registrable Securities),
messenger, telephone and delivery expenses, and the fees and expenses of counsel
for the underwriter, costs of printing prospectuses, and fees and disbursements
of counsel for the Company and of all independent certified public accountants
of the Company (including the expenses of any special audit and "cold comfort"
letters required by or incident to such performance).

         "Registration Statement" means any registration statement of the
          ----------------------
Company which includes any of the Registrable Securities pursuant to the
provisions of this Agreement, including the prospectus included or deemed

                                      -2-
<PAGE>
 
included in the Registration Statement and all amendments and supplements to the
Registration Statement or the prospectus, including post-effective amendments,
and all exhibits to, and all materials incorporated by reference in, the
Registration Statement.

         "SEC" means the United States Securities and Exchange Commission or any
          ---                                                                   
similar agency then having the authority to enforce the Exchange Act or the
Securities Act.

         "Securities Act" means the Securities Act of 1933, as amended, or any
          --------------                                                      
similar or successor statute, and the rules and regulations of the SEC
promulgated thereunder, all as the same shall be in effect at the time.

         "Selling Expenses" means (i) all fees and expenses of counsel and
          ----------------                                                
accountants for the Holder(s), (ii) all discounts, commissions or fees of
underwriters, selling brokers, dealer managers or similar securities industry
professionals relating to the distribution of the Registrable Securities, (iii)
transfer taxes and (iv) any other expenses of the Holder(s) incident to this
Agreement (excluding Registration Expenses).

         "Selling Holders" has the meaning set forth in Paragraph 6(b).
          ---------------                                              

         "Shares" means the shares of Common Stock into which the shares of
          ------                                                           
Preferred Stock, the shares of Additional Preferred Stock, if any, and the
Warrants are convertible or exercisable, as the case may be.  The Preferred
Stock, the Additional Preferred Stock, if any, and the shares of Additional
Preferred Stock into which the Additional Warrants, if any, are convertible,
shall be deemed to be Shares if and when it is listed for inclusion on the
automated quotation system of the National Association of Securities Dealers,
Inc. ("NASD") or any national securities exchange on which a class of the
Company's equity securities is listed.

     2.  Securities Subject to this Agreement.  The securities entitled to the
         ------------------------------------                                 
benefits of this Agreement are the Registrable Securities, but such benefits
shall continue with respect to each such security only so long as such security
continues to be a Registrable Security.  A security ceases to be a Registrable
Security when (a) a Registration Statement covering the sale of such Registrable
Security has been declared effective under the Securities Act and the
Registrable Security has been sold in accordance with the Registration
Statement; (b) it is distributed to the public pursuant to Rule 144 (or any
similar provision then in force) under the Securities Act; (c) a new certificate
representing such security has been delivered (to the original Holder or any
subsequent transferee) by the Company free from any restrictive legend and
without issuance of stop transfer or other instructions to the Company's
transfer agent and the Holder of such security has been advised by counsel
reasonably acceptable to it that subsequent disposition of such security will

                                      -3-
<PAGE>
 
not require registration or qualification under the Securities Act then in
effect; or (d) the security has ceased to be outstanding.

     3.  Shelf Registration.
         ------------------ 

         (a)   The Company shall file within 60 days following the date hereof
with the SEC, and shall use its best efforts to cause the SEC to promptly
declare effective, a Registration Statement relating to the Registrable
Securities, which Registration Statement shall provide for the sale by the
holders thereof of the Registrable Securities from time to time on a delayed or
continuous basis pursuant to Rule 415 under the Securities Act (the "Shelf
Registration").

         (b)   The foregoing notwithstanding, the Company shall have the right
in order to avoid the disclosure of any corporate development that the Company
is not otherwise obligated to disclose to delay the filing of the Registration
Statement with respect to the Shelf Registration for a reasonable length of time
(a "Delay Period"); provided, that the aggregate number of days in the Delay
                    --------                                                
Period shall not exceed 30.  The Company shall provide written notice to each
holder of Registrable Securities to be covered by the Shelf Registration of the
beginning and end of the Delay Period.

         (c)   Failure to file a Registration Statement or cause such
Registration Statement to become effective pursuant to the provisions of this
Section 3 by reason of delays caused by any of the Holders in connection with
their rights set forth in Section 6(l) of this Agreement shall not result in a
breach of this Section 3.

         (d)   To the extent that the holders of Registrable Securities would
not be adversely effected, the Company may include other securities in such
Shelf Registration (whether for the account of the Company or otherwise,
including without limitation any securities of the Company held by security
holders, if any, who have piggyback registration rights with respect thereto) or
otherwise combine the offering of the Registrable Securities with any offering
of other securities of the Company (whether for the account of the Company or
otherwise).

     4.  Preferred Stock Shelf Registration.
         ---------------------------------- 

         (a)   If the Shelf Registration is not declared effective by the SEC
prior to such time as the Preferred Stock and the Additional Preferred Stock, if
any, is listed (the "Listing") for inclusion on the automated quotation system
of the NASD or any national securities exchange on which a class of the
Company's equity securities is listed, the Company shall file within 60 days
following the Listing with the SEC, and shall use its best efforts to cause the
SEC to promptly declare effective, a new or appropriately amended Registration
Statement relating to the Registrable 

                                      -4-
<PAGE>
 
Securities, which Registration Statement shall provide for the sale by the
holders thereof of the Registrable Securities from time to time on a delayed or
continuous basis pursuant to Rule 415 under the Securities Act (the "Preferred
Stock Shelf Registration").

         (b)   The foregoing notwithstanding, the Company shall have the right
in order to avoid the disclosure of any corporate development that the Company
is not otherwise obligated to disclose to delay the filing of the Registration
Statement with respect to the Preferred Stock Shelf Registration for a
reasonable length of time (a "Preferred Stock Delay Period"); provided, that 
                                                              --------          
the aggregate number of days in the Preferred Stock Delay Period shall not
exceed 30. The Company shall provide written notice to each holder of
Registrable Securities to be covered by the Shelf Registration of the beginning
and end of the Preferred Stock Delay Period.

         (c)   Failure to file a Registration Statement or cause such
Registration Statement to become effective pursuant to the provisions of this
Section 4 by reason of delays caused by any of the Holders in connection with
their rights set forth in Section 6(l) of this Agreement shall not result in a
breach of this Section 4.

         (d)   To the extent that the holders of Registrable Securities would
not be adversely effected, the Company may include other securities in such
Preferred Stock Shelf Registration (whether for the account of the Company or
otherwise, including without limitation any securities of the Company held by
security holders, if any, who have piggyback registration rights with respect
thereto) or otherwise combine the offering of the Registrable Securities with
any offering of other securities of the Company (whether for the account of the
Company or otherwise).

     5.  Registration under the Securities Act:  Piggy-Back Registration.
         --------------------------------------------------------------- 

         (a)   Piggy-Back Registration.  If at any time the Company proposes to
               -----------------------                                         
register for itself or any of its stockholders any of its capital stock under
the Securities Act in connection with the public offering of such securities on
a form and in a manner that would permit registration of Registrable Securities
for sale to the public under the Securities Act, then:

               (i)   the Company in each case will notify in writing each Holder
of the filing or intended filing of a Registration Statement in connection
therewith prior to the proposed effective date thereof;

               (ii)  the Company will offer each Holder the opportunity to
include in such registration all or such lesser amount of Registrable Securities
as 

                                      -5-
<PAGE>
 
each Holder may request.  Upon the request of one or more Holders given in
writing within 20 days after receipt of the notice described under clause (i)
above, the Company, subject to the provisions of Paragraph 5(b), shall cause any
of the Registrable Securities specified by such Holder to be included in the
Registration Statement; and

               (iii) if the registration of which the Company gives written
notice under clause (i) above involves an underwriting, the Company shall use
its best efforts to cause the managing underwriter(s) of the proposed
underwritten offering to permit Holders to include their Registrable Securities
in the underwriting on the same terms and conditions as similar terms of the
Company included therein.

         (b)   Limitations on the Company's Obligations to Effect Piggy-Back
               -------------------------------------------------------------
Registration.  Notwithstanding the provisions of Paragraph 5(a) above:
- ------------                                                          

               (i)   if and to the extent that the managing underwriter(s)
advise the Company in writing that, in its good faith determination, inclusion
of the number of Registrable Securities held by Holders requesting inclusion in
the Registration Statement would materially interfere with the underwriter's
ability to effectuate the registration and sale of securities proposed to be
offered and sold pursuant to the Registration Statement, the managing
underwriter(s) shall select the permissible quantity of Registrable Securities
to be sold by the Holders (which may be none) by reducing the total number of
securities to be sold by the holders of securities other than Registrable
Securities and the Holders on a pro rata basis; provided, however, that no such
                                --- ---- 
reduction may reduce the securities being offered by the Company for its own
account. For purposes of apportionment pursuant to this Paragraph 5(b), for any
selling holder that is a partnership or a corporation, the affiliates of such
partnership or corporation shall collectively, with such holder be deemed to be
one "selling holder," and any pro rata reduction with respect to such "selling
holder" shall be based upon the aggregate amount of shares carrying registration
rights owned by entities and individuals included in such "selling holder"; and

               (ii)  if, at any time after giving such written notice of its
intention to register any of its securities and prior to the effective date of
the applicable Registration Statement filed in connection with such
registration, the Company shall determine for any reason not to register such
securities, the Company may, at its election, give written notice of such
determination to each holder of Registrable Securities and thereupon shall be
relieved of its obligation to register any Registrable Securities in connection
with such registration.

         (c)   Underwritten Offer.  If the registration of which the Company
               ------------------                                           
gives written notice under Paragraph 5(a)(i) above involves an underwriting, the

                                      -6-
<PAGE>
 
Company shall so advise in such written notice.  In such event the right of any
Holder to registration pursuant to Paragraph 5(a) shall be conditioned upon such
Holders's participation in such underwriting and the inclusion of such Holder's
Registrable Securities in such underwriting.  All Holders proposing to
distribute their Registrable Securities through such underwriting shall
(together with the Company and the other holders distributing their Registrable
Securities through such underwriting) enter into an underwriting agreement in
customary form with the underwriter or underwriters selected for such
underwriting by the Company.  If any Holder disapproves of the terms of any such
underwriting, such Holder may elect to withdraw from the underwriting by prompt
written notice to the Company and the underwriter.

     6.  Registration Obligations of the Company.  In connection with the
         ---------------------------------------                         
filing of a Registration Statement pursuant to Paragraphs 3, 4 and 5 the Company
shall:

         (a)   Use its best efforts to cause such Registration Statement to
remain in effect until the earlier of (i) the completion of the distribution of
the Registrable Securities included in the Registration Statement, and (ii) two
years after the date on which the Registration Statement is declared effective.

         (b)   Notify the Holders whose Registrable Securities are included in
such Registration Statement (the "Selling Holders") as to the filing of the
Registration Statement and of all amendments or supplements thereto filed prior
to the effective date of such Registration Statement;

         (c)   Notify the Selling Holders, promptly after the company shall
receive notice thereof, of the time when such Registration Statement became
effective or when any amendment or supplement to any prospectus forming a part
of said Registration Statement has been filed;

         (d)   Notify the Selling Holders promptly of any request by the SEC for
the amending or supplementing of such Registration Statement or prospectus or
for additional information;

         (e)   During the period in which the Company is obligated to use its
reasonable best efforts to keep a Registration Statement effective pursuant to
this Paragraph 6, prepare and promptly file with the SEC and promptly notify the
Selling Holders of the filing of any amendments or supplements to such
Registration Statement or prospectus as may be necessary to correct any
statements or omissions if, at any time when a prospectus relating to the
Registrable Securities is required to be delivered under the Securities Act, any
event with respect to the Company shall have occurred as a result of which any
such prospectus or any other prospectus as then in effect would include an
untrue statement of a material fact or omit to state any material fact necessary
to make the statements therein not misleading; and, in

                                      -7-
<PAGE>
 
addition, during such period, prepare and file with the SEC, promptly upon the
Selling Holders' written request, any amendments or supplements to such
Registration Statement or prospectus which may be reasonably necessary or
advisable in connection with the distribution of the Registrable Securities;

         (f)   Prepare promptly upon request of the Selling Holders or any
underwriters for the Selling Holders made during the period in which the Company
is obligated to use its best efforts to keep a Registration Statement effective,
such amendment or amendments to such Registration Statement and such prospectus
or prospectuses as may be reasonably necessary to permit compliance with the
requirements of Section 10(a)(3) of the Securities Act;

         (g)   Advise the Selling Holders promptly after the Company shall
receive notice or obtain knowledge of the issuance of any stop order by the SEC
suspending the effectiveness of any such Registration Statement or amendment
thereto or of the initiation or threatening of any proceeding for that purpose,
and promptly use its reasonable best efforts to prevent the issue of any stop
order or obtain its withdrawal promptly if such stop order should be issued;

         (h)   Use its best efforts to qualify as soon as reasonably practicable
the Registrable Securities for sale under the securities or blue sky laws of
such states and jurisdictions within the United States as shall be reasonably
requested by the Selling  Holders; provided that the Company shall not be
required in connection therewith or as a condition thereto to qualify to do
business, to become subject to taxation or to file a consent to service of
process generally in any of the aforesaid states or jurisdictions;

         (i)   Furnish the Selling Holders, as soon as available, copies of any
Registration Statement and each preliminary or final prospectus, or supplement
or amendment required to be prepared pursuant hereto, all in such quantities as
the Selling Holders may from time to time reasonably request;

         (j)   Furnish each Selling Holder with copies of such opinions of
counsel and accountants' "comfort" letters as it reasonably may request with
respect to the registration of its Registrable Securities, the Registration
Statement covering such Registrable Securities and the financial statements
included therein;

         (k)   Apply for listing and use its best efforts to list the
Registrable Securities, if any, being registered on any national securities
exchange on which a class of the Company's equity securities is listed (and to
maintain such listing during the pendency of the relevant registration period)
or, if the Company does not have a class of equity securities listed on a
national securities exchange, apply for qualification and use its reasonable
best efforts to qualify the Registrable Securities, if any, being registered for
inclusion on the automated quotation system of the NASD

                                      -8-
<PAGE>
 
(and to maintain such qualification during the pendency of the relevant
registration period);

         (l)   In connection with the preparation and filing of each
Registration Statement registering Registrable Securities under the Securities
Act, give the holders of Registrable Securities on whose behalf such Registrable
Securities are to be so registered and their underwriters, if any, and their
respective counsel and accountants, the opportunity to participate in the
preparation of such Registration Statement, each prospectus included therein or
filed with the SEC, and each amendment thereof or supplement thereto, and will
give each of them such access to its books and records and such opportunities to
discuss the business of the Company with its officers and the independent public
accountants who have certified its financial statements as shall be necessary,
in the opinion of such holders and such underwriters, or their respective
counsel, to conduct a reasonable investigation within the meaning of the
Securities Act; and

         (m)   Make senior executives of the Company reasonably available to
assist the underwriters with respect to, and accompanying the underwriters on
the so-called "road show", in connection with marketing efforts for, and the
distribution and sale of Registrable Securities pursuant to a Registration
Statement in connection with an underwritten public offering.

     7.  Expenses.  The Company will pay all Registration Expenses in
         --------                                                    
connection with registrations of Registrable Securities effected pursuant to
Paragraphs 3, 4 and 5.  All Selling Expenses in connection with any registration
effected pursuant to this Agreement shall be borne by the Holder(s).

     8.  Indemnification.
         --------------- 

         (a)   To the extent permitted by applicable law, the Company will
indemnify each Holder of the Registrable Securities requesting or joining in a
registration, each Person who controls such Holder within the meaning of Section
15 of the Securities Act, and each underwriter of the securities so registered
and each person who controls such underwriter, and their respective officers,
directors, partners, agents, employees and successors (each a "Section 8(a)
Indemnitee"), against all costs, expenses, demands, claims, losses, damages,
liabilities, fines and penalties (or actions in respect thereof), to which such
Section 8(a) Indemnitee may become subject under the Securities Act, the
Exchange Act or otherwise, insofar as such claims, losses, damages, liabilities,
fines and penalties arise out of or are based on any untrue statement (or
alleged untrue statement) of a material fact contained in any Registration
Statement or prospectus, or arise out of or are based upon any omission (or
alleged omission) to state therein a fact required to be stated therein or
necessary to make the statements therein not misleading, or any violation or
alleged violation by the Company of the Securities Act, the Exchange Act, any
state

                                      -9-
<PAGE>
 
securities law or any rule or regulation promulgated under the Securities Act,
the Exchange Act or any state securities law and will reimburse each such
Section 8(a) Indemnitee for (and will make periodic advances to cover) any legal
and any other expenses reasonably incurred in connection with investigating or
defending any such demand, claim, loss, damage, liability or action promptly
after submission of supporting materials with respect to such expenses;
provided, however, that the Company shall not be required to indemnify any
- --------  -------                                                         
Section 8(a) Indemnitee for any cost, expense, demand, claim, loss, damage,
liability, fine or penalty which arises out of or is based upon (i) any written
information provided by any such Section 8(a) Indemnitee, respectively,
expressly for inclusion in the Registration Statement or (ii) the circumstances
set forth in clause (y) of paragraph (b) below.

         (b)   To the extent permitted by applicable law, each Holder requesting
or joining in a registration, severally and not jointly, will indemnify the
Company, each of its officers, directors, employees, agents, successors and
controlling persons (within the meaning of Section 15 of the Exchange Act)
(each, a "Section 8(b) Indemnitee"), against all costs, expenses, demands,
claims, losses, damages, liabilities, fines and penalties (or actions in respect
thereof) to which such Section 8(b) Indemnitee may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such losses, claims,
damages, liabilities, fines and penalties arise out of or are based upon an
untrue statement (or alleged untrue statement) of a material fact contained in
any Registration Statement or prospectus, or arise out of or are based upon (x)
the omission (or alleged omission) to state therein a fact required to be stated
therein or necessary to make the statements therein not misleading, in each case
to the extent, but only to the extent, that such untrue statement (or alleged
untrue statement or omission (or alleged omission) was made in any Registration
Statement or prospectus in reliance upon and in conformity with information
furnished to the Company by such Holder requesting or joining in a registration
specifically for use in the preparation thereof, or (y) any untrue statement or
alleged untrue statement of a material fact contained in, or any omission or
alleged omission of a material fact from, a prospectus if (i) a later prospectus
corrected the untrue statement or alleged untrue statement, or omission or
alleged omission, (ii) at such time the Company had advised the Holder of the
availability of the revised prospectus, and (iii) there would have been no such
liability had such later prospectus actually been delivered to the purchaser at
or prior to confirmation of sale; provided, however, that the obligations of
                                  --------  -------                         
such Holders hereunder shall be limited to an amount equal to the proceeds to
each Holder of the Registrable Securities sold in connection with such
registration.

         (c)   Each party entitled to indemnification under this Paragraph 8
(the "Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has received written notice of any claim as to which indemnity may be sought,
and shall permit the Indemnifying Party to assume the defense of any such claim
or any

                                      -10-
<PAGE>
 
litigation resulting therefrom, provided such counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not be unreasonably
withheld or delayed).  The Indemnified Party may participate in such defense at
such party's expense; provided, however, that the Indemnifying Party shall bear
the expense of such defense of the Indemnified Party if (i) the Indemnifying
Party has agreed in writing to pay such expenses, (ii) the Indemnifying Party
shall have failed to assume the defense of such claim or employ counsel
reasonably satisfactory to the Indemnified Party, or (iii) in the reasonable
judgment of the Indemnified Party, based upon the written advice of such
Indemnified Party's counsel, representation of both parties by the same counsel
would be inappropriate due to actual or potential conflicts of interest.  In the
event that the Indemnifying Party properly does not assume such defense, the
Indemnifying Party shall not be subject to any liability for any settlement made
without its prior written consent, which consent shall not be unreasonably
withheld or delayed.  The failure of any Indemnified Party to give notice as
provided herein shall relieve the Indemnifying Party of its obligations under
this Paragraph 8 only to the extent that such failure to give notice shall
materially adversely prejudice the Indemnifying Party in the defense of any such
claim or any such litigation.  No Indemnifying Party, in the defense of any such
claim or litigation, shall, except with the prior written consent of each
Indemnified Party, consent to entry of any judgment or enter into any settlement
which does not include as an unconditional term thereof the giving by the
claimant or plaintiff to such Indemnified Party of a release from all liability
in respect to such claim or litigation in form and substance reasonably
satisfactory to such Indemnified Party.

     9.  Contribution.
         ------------ 

         (a)   If the indemnification provided for in Paragraph 8 from the
Indemnifying Party is unavailable to or unenforceable by the Indemnified Party
in respect to any losses, claims, damages, liabilities or expenses referred to
herein, then the Indemnifying Party, in lieu of indemnifying such Indemnified
Party, shall contribute to the amount paid or payable by such Indemnified Party
as a result of such losses, claims, damages, liabilities or expenses in such
proportion as is appropriate to reflect the relative fault of the Indemnifying
Party and Indemnified Parties in connection with the actions which resulted in
such losses, claims, damages, liabilities or expenses, as well as any other
relevant equitable considerations.  The relative fault of such Indemnifying
Party and Indemnified Parties shall be determined by reference to, among other
things, whether any action in question, including any untrue or alleged untrue
statement of a material fact or omission or alleged omission to state a material
fact, has been made by, or relates to information supplied by, such Indemnifying
Party or Indemnified Parties, and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such action.  The
amount paid or payable by a party as a result of the losses, claims, damages,
liabilities and expenses referred to above shall be deemed to

                                      -11-
<PAGE>
 
include, subject to the limitations set forth in Paragraph 8, any legal or other
fees or expenses reasonably incurred by such party in connection with any
investigation or proceeding.

         (b)   The Company and the Holders agree that it would not be just and
equitable if contribution pursuant to this Paragraph 9 were determined by pro
                                                                          ---
rata allocation or by any other method of allocation which does not take into
- ----                                                                         
account the equitable considerations referred to in the immediately preceding
paragraph.  No Person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any Person who was not guilty of such fraudulent misrepresentation.

         (c)   If Indemnification is available under Paragraph 8, the
Indemnifying Parties shall indemnify each Indemnified Party to the full extent
provided in Paragraph 8 without regard to the relative fault of the Indemnifying
Party or Indemnified Party or any other equitable consideration provided for in
this Paragraph 9.

     10. Holdback Agreements.
         --------------------

         (a)   Restrictions on Public Sale by Holder of Registrable Securities.
               ---------------------------------------------------------------- 
To the extent requested by the Company and the managing underwriter with respect
to the applicable Registration Statement, each Holder whose Registrable
Securities are included in a Registration Statement filed pursuant to Paragraphs
3, 4 and 5  hereof agrees not to effect any public sale or distribution of the
issue being registered or any similar security of the Company, including a sale
pursuant to Rule 144 or Rule 144A under the Securities Act, during the seven
(7)-day period prior to, and during the 90-day period beginning on, the
effective date of such Registration Statement, to the extent such sales may
prevent the Company from being in compliance with the Exchange Act; provided,
                                                                    ---------
however, that all officers and directors of the Company enter into similar
- --------                                                                  
agreements.  Such agreement shall be in writing reasonably satisfactory to the
Company and such managing underwriter.

         (b)   Restrictions on Public Sale by the Company and Others.  The
               ------------------------------------------------------     
Company shall not make any public or nonpublic sale or distribution of any
securities of the same class as those being registered, or any securities
convertible into or exchangeable or exercisable for any such securities, during
the seven day period prior to, and during the 60-day period beginning on, the
effective date of any Registration Statement in which holders of Registrable
Securities are participating or the commencement of a public distribution of
Registrable Securities pursuant to any such Registration Statement (except (i)
as part of such registration or pursuant to registrations on SEC Forms S-4 or S-
8 or any similar or successor form, or on any form filed in connection with an
exchange offer or an offering of securities solely to the existing stockholders
or employees of the Company or (ii) for sales or other

                                      -12-
<PAGE>
 
issuances of securities pursuant to outstanding options, warrants, rights or
similar obligations).

     11. Rule 144 and Stock Exchange Listings.
         -------------------------------------

         To the extent that the Company is subject to the filing and reporting
requirements of the Securities Act and the Exchange Act, and so long as there
are Registrable Securities outstanding:

         (a)   The Company will file the reports required to be filed by it
under the Securities Act and the Exchange Act and the rules and regulations
adopted by the SEC thereunder, and will take such further action as any holder
of Registrable Securities may reasonably request, all to the extent required
from time to time to enable such holder to sell Registrable Securities without
registration under the Securities Act within the limitation of the exemptions
provided by (i) Rule 144 or Rule 144A under the Securities Act, as such Rule may
be amended from time to time, or (ii) any similar rule or regulation hereafter
adopted by the SEC. Upon the request of any holder of Registrable Securities,
the Company will deliver to such holder a written statement as to whether it has
complied with such information and requirements

         (b)   The Company will use its best efforts to avoid taking any action
which would cause the Common Stock to cease to be eligible for inclusion on
either of the NASD Automated Quotation System or for listing on any securities
exchange on which it may become listed.

     12. Obligations of Holder.
         ----------------------

         (a)   Each Holder of Registrable Securities included in any
registration shall furnish to the Company such information regarding such Holder
and the distribution proposed by such Holder, and shall otherwise use reasonable
best efforts to cooperate with the Company and any underwriter(s), as the
Company may reasonably request and as shall be reasonably required in connection
with any registration, qualification or compliance referred to in this
Agreement.

         (b)   Each Holder of the Registrable Securities agrees by acquisition
of such Registered Securities that upon receipt of any notice from the Company
pursuant to Paragraph 6(g), such Holder will forthwith discontinue such Holder's
disposition of Registered Securities pursuant to the Registration Statement
relating to such Registered Securities under such Holder's receipt of the copies
of the supplemented or amended prospectus contemplated by Paragraph 6(g) and if
so directed by the Company, will deliver to the Company (at the Company's
expense) all copies, other than permanent file copies, then in such Holder's
possession of the prospectus relating to such Registered Securities at the time
of receipt of such notice.

                                      -13-
<PAGE>
 
     13. Mergers, etc.
         -------------

     The Company shall not, directly or indirectly, enter into any merger,
consolidation or reorganization in which the Company shall not be the surviving
corporation unless the surviving corporation shall, prior to such merger,
consolidation or reorganization, agree in writing to assume the obligations of
the Company under this Agreement, and for that purpose references hereunder to
"Registrable Securities" shall be deemed to include the securities which the
Holders would be entitled to receive in exchange for Common Stock under any such
merger, consolidation or reorganization, provided that to the extent such
securities to be received are convertible into shares of common stock of the
issuer thereof, then any such shares of common stock or other securities as are
issued or issuable upon conversion of said convertible securities shall also be
included within the definition of "Registrable Securities."

     14. Miscellaneous
         -------------

         (a)   Transfer of Certain Rights.  The rights granted to the Holders
               --------------------------                                    
under this Agreement may be transferred only to a transferee who delivers to the
Company, within a reasonable time after such transfer, a written instrument by
which such transferee agrees to be bound by the applicable terms of this
Agreement.  Notwithstanding the foregoing, nothing herein shall prohibit:  (i)
any Holder from transferring any of its rights under this Agreement to any
wholly-owned subsidiary of such Holder or to any entity which merges or
consolidates with or acquires all or substantially all of the equity securities
or assets of such Holder, (ii) any Holder which is a partnership from
transferring any of its rights under this Agreement to a partner of such
partnership where such partner receives Registrable Securities in a distribution
from such partnership, (iii) any Holder who is an individual from transferring
any of its rights under this Agreement to such Holder's spouse or to other
relatives, or to a trust for the benefit of the Holder, or his or her spouse or
other relatives; or (iv) any trustee of a trust which holds Registerable
Securities from distributing such Registrable Securities to the beneficiaries of
such trusts; provided that any such transferee under subparagraphs (i), (ii),
             --------                                                        
(iii) or (iv) above will hold the Registrable Securities subject to the terms
and conditions of this Agreement.  Upon any transfer of the rights of a Holder
permitted by and completed in compliance with the terms of this Agreement, the
transferee shall become a "Holder" for purposes of this Agreement.

         (b)   Remedies.  In the event of a breach by the Company of its
               --------                                                 
obligations under this Agreement, each holder of Registrable Securities, in
addition to being entitled to exercise all rights granted by law, including
recovery of damages, will be entitled to specific performance of its rights
under this Agreement.  The Company agrees that monetary damages would not be
adequate compensation for any loss incurred by reason of a breach by it of any
of the provisions of this

                                      -14-
<PAGE>
 
Agreement and hereby agrees to waive the defense in any action for specific
performance that a remedy at law would be adequate.

         (c)   Amendments and Waivers.  The provisions of this Agreement may not
               ----------------------                                           
be amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given without the written consent of the
Company and Holders of at least a majority of the Registrable Securities
affected by such amendment, modification, supplementation, waiver or consent.
Notwithstanding the foregoing, a waiver or consent to departure from the
provisions hereof with respect to a matter which relates exclusively to the
rights of Holders of Registrable Securities whose securities are being sold
pursuant to a Registration Statement and which does not directly or indirectly
affect the rights of other Holders of Registrable Securities may be given by the
Holders of a majority of the Registrable Securities being sold by such Holders,
provided that the provisions of this sentence may not be amended, modified, or
supplemented except in accordance with the provisions of the immediately
preceding sentence.

         (d)   Notices.  All notices and other communications provided for or
               -------                                                       
permitted hereunder shall be made in writing and shall be delivered by hand,
overnight courier service, registered or certified first-class mail, return
receipt requested, or telecopier; if to a Holder, at the address set forth
opposite such Holder's name on the signature pages attached hereto or such other
address as may have been furnished to the Company in writing; if to the Company,
at 2658 Patton Road, Roseville, Minnesota 55113, Attention:  President and
thereafter at such other address, notice of which is given in accordance with
the provisions of this Paragraph 13(d).

         All such notices and communications shall be deemed to have been duly
given when delivered by hand, if personally delivered; one business day after
sent if sent by courier service.

         (e)   No Inconsistent Agreements.  The Company shall not on or after
               --------------------------                                    
the date of this Agreement enter into any agreement with respect to its
securities which is inconsistent with the rights granted to the holders of
Registrable Securities in this Agreement or otherwise conflicts with the
provisions hereof. To the extent the Company on or after the date of this
Agreement grants any superior or more favorable rights or terms to any Person
with respect to its securities, any such superior or more favorable rights or
terms shall also be deemed to have been granted simultaneously to the holders of
Registrable Securities. The Company agrees to deliver to representatives of the
initial Holders hereunder, upon the request of such initial Holders, copies of
all agreements which it has previously entered into or become a party to, or by
which it is bound, with respect to its securities granting any registration
rights to any Person which is inconsistent with the rights granted hereunder.
The rights granted to the holders of Registrable

                                      -15-
<PAGE>
 
Securities hereunder do not in any way conflict with and are not inconsistent
with the rights granted to the holders of the securities of the Company under
any other agreements.

         (f)   Governing Law; Forum.  This Agreement shall be governed by and
               --------------------                                          
construed in accordance with the laws of the State of Minnesota without
regarding to the conflict of laws provisions thereof.  The parties irrevocably
agree that all actions arising directly or indirectly as a result or in
consequence of this Agreement and the transactions contemplated hereby, shall be
instituted and litigated only on federal, state or local courts sitting in the
City of Minneapolis, Minnesota and each of the parties hereby consents to the
exclusive jurisdiction and venue of any such court, and waives any objection
based on forum nonconveniens.
         ----- ------------- 

         (g)   Counterparts.  This Agreement may be executed in any number of
               ------------                                                  
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

         (h)   Headings.  The headings in this Agreement are for convenience of
               --------                                                        
reference only and shall not limit or otherwise affect the meaning hereof.

         (i)   Severability.  In the event that any one or more of the
               ------------                                           
provisions contained herein, or the application thereof in any circumstances, is
held invalid, illegal or unenforceable, the validity, legality and
enforceability of any such provisions in every other respect and of the
remaining provisions contained herein shall not be affected or impaired thereby.

         (j)   Entire Agreement.  This Agreement and the Purchase Agreement (and
               ----------------                                                 
all exhibits and/or schedules attached hereto and thereto) is intended by the
parties as a final expression of their agreement and intended to be a complete
and exclusive statement of the agreement and understanding of the parties hereto
in respect of the subject matter contained herein.  There are no restrictions,
promises, warranties or undertakings, other than those set forth or referred to
herein with respect to the registration rights granted by the Company with
respect to the securities now or hereafter owned by the Holders.

         (k)   Attorneys' Fees.  If any legal action or other proceeding is
               ---------------                                             
brought for the enforcement of this Agreement, or because of an alleged dispute,
breach, default or misrepresentation in connection with any of the provisions of
this Agreement, the prevailing party shall be entitled to recover reasonable
attorneys' fees and other costs incurred in that action or proceeding, in
addition to any other relief to which it may be entitled.

                                      -16-
<PAGE>
 
         IN WITNESS WHEREOF, the Agreement has been duly executed by the
parties as of the date first above written.

                                   DIAMETRICS MEDICAL, INC.


                                   By  /s/  Laurence L. Betterley
                                       -----------------------------------
                                       Its    Chief Financial Officer
                                           -------------------------------


                                   HOLDERS:


                                   [SIGNATURES OF HOLDERS]

                                      -17-


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