OXBORO MEDICAL INTERNATIONAL INC
SC 13D, 1998-02-13
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>

                                    UNITED STATES
                         SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, D.C.  20549
                                          
                                    SCHEDULE 13D
                                          
                     UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO. _________)*
                                          
                                          
                         OXBORO MEDICAL INTERNATIONAL, INC.
                                  (NAME OF ISSUER)
                                          
                            COMMON STOCK $.01 PAR VALUE
                           (TITLE OF CLASS OF SECURITIES)
                                          
                                    691384 10 1
                                   (CUSIP NUMBER)


                                 Larry A. Rasmusson
                                1485 - 139th Lane NW
                                  Andover, MN 55304

                                    (612) 757-9738
            ---------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notice and
Communications)

                                     January 15, 1998
    ----------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to 
report the acquisition 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 filing on this form with respect the subject class of securities, 
and for any subsequent amendment containing information which would alter 
disclosures 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).

<PAGE>

                                  SCHEDULE 13D

CUSIP No. 691384 10 1                 Page 2 of 28 pages, including exhibits

- -------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only)

    Larry A. Rasmusson

- -------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / /
                                                      (b) /x/

- -------------------------------------------------------------------------------
 3  SEC USE ONLY

- -------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*

    SC
- -------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d) OR 2(e)   

    N/A
- -------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
    United States
- -------------------------------------------------------------------------------
                            7    SOLE VOTING POWER
         NUMBER OF
           SHARES                655,751
        BENEFICIALLY        ---------------------------------------------------
          OWNED BY          8    SHARED VOTING POWER
           EACH
          REPORTING              -0-
           PERSON           ---------------------------------------------------
            WITH            9    SOLE DISPOSITIVE POWER

                                 655,751
                            ---------------------------------------------------
                            10   SHARED DISPOSITIVE POWER

                                 -0-
- -------------------------------------------------------------------------------
 11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     436,155
- -------------------------------------------------------------------------------
 12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/
            
     219,596 unvested shares held by the Employee Stock Ownership Plan over 
     which Mr. Rasmusson, as Trustee, has sole voting and sole dispositive 
     power.
- -------------------------------------------------------------------------------
 13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     16.4 percent.  Based upon 2,658,942 shares outstanding, including the
     shares reported in Row 11 
- -------------------------------------------------------------------------------
 14  TYPE OF REPORTING PERSON*
     IN
- -------------------------------------------------------------------------------

                                       2

<PAGE>

                                    SCHEDULE 13D

CUSIP No. 691384 10 1                    Page 3 of 28 pages, including exhibits

ITEM 1.  SECURITY AND ISSUER

     State the title of the class of equity securities to which this statement
relates and the name and address of the principal executive officers of the
issuer of such securities.

     Common Stock, $.01 par value
     Oxboro Medical International, Inc.
     13828 Lincoln Street  N.E.
     Ham Lake, Minnesota 55304


ITEM 2.  IDENTITY AND BACKGROUND

     (a)  Name:  

          Larry A. Rasmusson

     (b)  Business address:

          13828 Lincoln Street NE, Ham Lake, Minnesota  55304

     (c)  Present principal occupation or employment and the name, principal
          business and address of any corporation or other organization in which
          such employment is conducted:
     
          Chairman of Board, CEO & CFO of Oxboro Medical International, Inc.,
          13828 Lincoln Street NE, Ham Lake, Minnesota  55304

      (d) Whether or not, during the last five years, such person has been
          convicted in a criminal proceeding (excluding traffic violations or
          similar misdemeanors) and, if so, give the dates, nature of
          conviction, name and location of court, and penalty imposed, or other
          disposition of the case:
     
          N/A
     
     (e)  Whether or not, during the last five years, such person was 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;
          and, if so, identify and describe such proceedings and summarize the
          terms of such judgment, decree or final order:
     
          N/A
     
     (f)  Citizenship:
     
          United States

                                       3

<PAGE>

                                 SCHEDULE 13D

CUSIP No. 691384 10 1                    Page 4 of 28 pages, including exhibits

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     Mr. Rasmusson exercised options to purchase 220,364 shares of common stock
of the Issuer effective January 15, 1998.  The exercise price of $230,546 was
paid by delivery of two nonrecourse promissory notes to the Issuer, one in the
amount of $200,000 and one in the amount of $30,546, each providing for payment
of the principal amount in five equal annual installments, commencing in January
1999, together with all interest accrued and unpaid as of the date of payment,
and interest at an annual rate of 6%.  The shares have been pledged to and are
being held by the Issuer as security for the repayment of the note.

ITEM 4.  PURPOSE OF TRANSACTION

     The purpose of the acquisition was for investment and, secondarily, in 
response to the solicitation of proxies in opposition to management in 
connection with the 1998 Annual Meeting.  Mr. Rasmusson intends to vote all 
shares (including shares acquired after the record date for the meeting, to 
the extent that he obtains proxies for such shares) in favor of management
proposals and nominees to the Board of Directors.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

     (a)  Aggregate number and percentage of the class of securities
          beneficially owned:

          436,155 shares of Common Stock, representing 16.4% of the total 
          shares of the Issuer outstanding as of January 16, 1998, as 
          disclosed in the Issuer's definitive proxy statement dated February 
          4, 1998.  In addition, under Section 13d-3(b) (under some 
          interpretations) Mr. Rasmusson may be deemed to be the beneficial 
          owner of 40,000 shares of the Issuer's common stock in which Dennis 
          Mikkelson has a beneficial interest, 40,000 shares of the Issuer's 
          common stock in which John R. Walter has a beneficial interest and 
          219,596  shares of the Issuer's common stock held by the Company's 
          Employee Stock Ownership Plan over which Mr. Rasmusson, as Trustee, 
          has sole voting power.  (Each of the foregoing has reported his or 
          its beneficial ownership on a Schedule 13D.)  If combined. such 
          shares would equal 27.7% of the Issuer's outstanding shares as of 
          January 16, 1998.

      (b) Number of shares as to which there is sole power to vote or to direct
          the vote, shared power to vote or to direct the vote, sole power to
          dispose or to direct the disposition, or shared power to dispose or to
          direct the disposition:

          Mr. Rasmusson has sole power to vote and dispose of 655,751 shares
          (including 219,596 unvested shares held in the Employee Stock 
          Ownership Plan of which Mr. Rasmusson is Trustee).

     (c)  Transactions in the securities effected during the past sixty days:

          Mr. Rasmusson acquired 200,000 shares of the Common Stock of the
          Issuer on January 15, 1998 for a purchase price of $1.00 per share. 
          Mr. Rasmusson also acquired 20,364 shares of the Common Stock of the
          Issuer on January 15, 1998 for a purchase price of $1.50 per share.

     (d)  No other person has the right to receive or the power to direct the
          receipt of dividends from, or the proceeds from the sale of, such
          securities.

                                      4

<PAGE>

                                SCHEDULE 13D

CUSIP No. 691384 10 1                     Page 5 of 28 pages, including exhibits

     (e)  The date on which the reporting person ceased to be the beneficial
          owner of more than five percent of the class of securities:

          N/A.

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

     Except as described above, there are no contracts, arrangements,
understandings or relationships (legal or otherwise) among the persons named in
Item 2 and between such persons and any 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.

     1    Stock Option Agreement dated August 17, 1995.  Filed as Exhibit 10.7
          to and incorporated by reference from the Issuer's Report on Form
          10-KSB for the year ended September 30, 1995.

     2    Stock Option Agreement dated October 1, 1997.  Filed as Exhibit
          10.7(b) to and incorporated by reference from the Issuer's Report on
          Form 10-KSB for the year ended September 30, 1997.

     3    Stock Option Agreement dated October 1, 1997.  Filed as Exhibit
          10.7(c) to and incorporated by reference from the Issuer's Report on
          Form 10-KSB for the year ended September 30, 1997.

     4    Stock Option Exercise and Loan Agreement dated January 15, 1998 for
          200,000 Shares of Common Stock

     5    Secured Promissory Note dated January 15, 1998 for $200,000.

     6    Instrument Security Agreement dated January 15, 1998.

     7    Stock Option Exercise and Loan Agreement dated January 15, 1998 for
          20,356 Shares of Common Stock

     8    Secured Promissory Note dated January 15, 1998 for $30,356.

     9    Instrument Security Agreement dated January 15, 1998.

                                      5

<PAGE>


                                    SCHEDULE 13D

CUSIP No. 691384 10 1                    Page 6 of 28 pages, including exhibits

SIGNATURE

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


   February 10, 1998                              /s/Larry A. Rasmusson
- ------------------------                        -------------------------
         Date                                           Signature

                                      6

<PAGE>

                       STOCK OPTION EXERCISE AND LOAN AGREEMENT


     THIS STOCK PURCHASE AGREEMENT, by and between Oxboro Medical 
International, Inc., a Minnesota corporation (the "Company"), and Larry A. 
Rasmusson, an individual residing in the State of Minnesota ("Rasmusson"), 
effective the 15th day of January, 1998.

                                      RECITALS
                                      --------

     WHEREAS, Rasmusson desires to exercise an outstanding option to purchase 
100,000 shares of the Company's Common Stock, $.01 par value (the "Shares"), 
for a purchase price of $1.00 per Share; and 
     
     WHEREAS, Rasmusson desires to exercise a deferred option to purchase 
100,000 shares of the Company's Common Stock, $.01 a value (the "Shares") for 
a purchase price of $1.00 per Share; and 
          
     WHEREAS, the Company desires to waive the terms of the deferred option 
to allow Rasmusson to exercise the deferred option as of the date hereof upon 
the terms and conditions set forth herein; and

     WHEREAS, the Company has agreed to lend funds to Rasmusson to pay the 
purchase price of the Shares under both options upon the terms and conditions 
set forth herein,

     NOW, THEREFORE, in consideration of the foregoing and the mutual 
promises contained herein, the parties hereto agree as follows:

     1.   AGREEMENT FOR LOAN.  The Company agrees to lend to Rasmusson 
$200,000 to purchase from the Company 200,000 Shares of the Company's Common 
Stock for $1.00 per share.  

     2.   EXERCISE OF OPTIONS.  Concurrently with the execution of this 
Agreement, Rasmusson will exercise the option to purchase the Shares by (a) 
delivery of notices of option exercise, (b) execution and delivery of a 
promissory note substantially in the form attached hereto as Exhibit A (the 
"Note"), in the aggregate amount of $200,000, and (c) execution and delivery 
of the Instruments Security Agreement attached hereto as Exhibit B (the 
"Security Agreement"), together with the Collateral (as defined in the 
Security Agreement).

<PAGE>

     3.   FORFEITURE OF DEFERRED OPTION SHARES.  In the event Rasmusson is 
not employed by the Company on October 1, 1998, and the deferred option would 
not have been otherwise exerciseable as provided in Paragraph a. of the 
Deferred Nonqualified Stock Option Agreement, then 100,000 Shares represented 
by said Deferred Option, of the total 200,000 Shares described herein, shall 
be returned to the Company.  The Company shall hereby have the power of 
attorney to cancel said 100,000 Shares in such event, and $100,000.00 shall 
be deducted from the above-referenced loan.

     4.   REPRESENTATION AND WARRANTIES OF RASMUSSON.  Rasmusson hereby 
represents and warrants to the Company as follows:

          (a)  INFORMATION ABOUT THE COMPANY.  Rasmusson has received and is
     familiar with the Company's Annual Report for the year ended September 30,
     1997.  Rasmusson has had the opportunity to receive any additional
     information concerning the Company he considers necessary or advisable in
     order to form a decision concerning this investment and has either received
     such information or waived such opportunity.
     
          (b)  ABILITY TO BEAR THE RISK.  Given Rasmusson's current and
     reasonably foreseeable future economic circumstances, Rasmusson can, for an
     indefinite period of time, bear the economic risk inherent in the
     acquisition of the Shares and can afford to sustain a complete loss of such
     investment.
     
          (c)  BUSINESS SOPHISTICATION.  Rasmusson is experienced and
     knowledgeable in financial and business matters and capable of evaluating
     the merits and risks of purchasing the Shares.
     
          (d)  AFFILIATION WITH THE COMPANY.  Rasmusson is a consultant to the
     Company and is a member of its Board of Directors.
     
          (e)  HOLDING PERIOD UNDER RULE 144.  Rasmusson understands that his
     ownership of the Shares for purposes of calculating the "holding period"
     required for resales pursuant to Rule 144 under the Securities Act of 1933
     may not commence until the consideration for the particular Shares has been
     paid in full.
     
     5.   SECURITY FOR NOTE.  The Note will be secured by Shares of the 
Company's Common Stock purchased by Rasmusson herein (the "Pledged Shares"). 
The Pledged Shares delivered or transferred to the Company shall be referred 
to herein as the "Collateral."  To the extent that any portion of the Note is 
not paid in accordance with the terms thereof, the Company shall have the 
right to foreclose upon and redeem such portion of the Collateral as shall 
satisfy the unpaid installment or portion of the Note.  Rasmusson agrees to 
execute and deliver any documents that may be required to establish the 
Company's security interest in the Collateral, including the certificates 
representing the Pledged Shares.  This security interest shall not affect 

                                       2

<PAGE>

Rasmusson's rights to vote the Pledged Shares or to receive dividends paid 
thereon.  However, any dividends paid on Pledged Shares subject to this 
security interest shall be applied to the amounts due on the Note, in such 
order of application as shall be determined by the Company.  The Company 
agrees to release its security interest in the Collateral, or the appropriate 
portion thereof, as the principal balance on the Note is paid.  For purposes 
of releasing Pledged Shares from this Security Agreement, the Pledged Shares 
shall be valued at the then current market price.

     6.   INVESTMENT PURPOSE IN ACQUIRING THE SHARES.  Rasmusson and the 
Company acknowledge that the Shares have not been registered under the 
Securities Act of 1933, as amended (the "Act"), or the securities laws of any 
state or foreign jurisdiction and will be issued to Rasmusson in reliance on 
exemptions from the registration requirements of the Act and of applicable 
state securities laws and in reliance on Rasmusson's representations and 
agreements contained herein. Rasmusson is acquiring the Shares for his own 
account for investment purposes only and not with a view to their resale or 
distribution.  Rasmusson has no present intention to divide his participation 
with others or to resell or otherwise dispose of all or any part of the 
Shares.  In making these representations, Rasmusson understands that in the 
view of the Securities and Exchange Commission, exemption of the Shares from 
the registration requirements of the Act would not be available, if, 
notwithstanding the representations of Rasmusson, Rasmusson has in mind 
merely acquiring the Shares for resale upon the occurrence or nonoccurrence 
of some predetermined event.

     7.   COMPLIANCE WITH SECURITIES ACT.  Rasmusson agrees that if the 
Shares or any part thereof are sold or distributed in the future, Rasmusson 
shall sell or distribute them pursuant to the requirements of the Act and of 
appropriate state securities laws.  Rasmusson agrees that he will not 
transfer any part of the Shares without either (a) obtaining an opinion of 
counsel satisfactory in form and substance to counsel for the Company stating 
that the proposed transaction does not require registration under the Act or 
applicable state securities laws or (b) such registration.

     8.   RESTRICTIVE LEGEND.  Rasmusson agrees that the Company may place on 
the certificates representing the Shares a restrictive legend containing 
substantially the following language:

          The securities represented by this certificate have not been
          registered under the Securities Act of 1933, as amended,
          have not been registered under the securities laws of any
          state or foreign jurisdiction, and are subject to an
          investment letter.  They may not be sold, offered for sale,
          or transferred in the absence of either an effective
          registration under the Securities Act of 1933, as amended,
          and under the applicable state securities laws or an opinion
          of counsel for the Company that such transaction does not
          require registration under the Act or applicable state
          securities laws.

                                      3

<PAGE>

     9.   STOP TRANSFER ORDER.  Rasmusson agrees that the Company may place a
stop transfer order with its registrar and stock transfer agent (if any)
covering all certificates representing the Shares.

     10.  NO GUARANTEE OF CONTINUED SERVICE.  This Agreement shall not enlarge
or diminish any rights Rasmusson may have to serve as an officer or as a
director of the Company.

     11.  BINDING EFFECT.  Neither this Agreement nor any interest herein shall
be assignable by Rasmusson without the prior written consent of the Company. 
The provisions of this Agreement shall be binding upon and inure to the benefit
of the parties hereto and their respective heirs, legal representatives,
successors, and assigns.

     12.  REPRESENTATIONS TO SURVIVE DELIVERY.  The representations, warranties,
and agreements of Rasmusson contained in this Agreement will remain operative
and in full force and effect and will survive payment of the purchase price and
delivery of certificates representing the Shares.

     13.  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Minnesota.

     14.  NOTICES.  All notices, requests, demands and other communications
under this Agreement shall be in writing and shall be deemed to have been duly
given on the date of service if served personally on the party to whom it is
given; or on the third day after mailing if mailed to the party to whom notice
is to be given, by first-class mail, registered or certified, postage prepaid,
and properly addressed as follows:

          The Company:        13818 Lincoln Street N.E.
                              Ham Lake, MN  55304

          Rasmusson:          13818 Lincoln Street N.E.
                              Ham Lake, MN  55304

     IN WITNESS WHEREOF, the undersigned have duly executed this Agreement on
the day and year first above written.

                                     /s/Larry A. Rasmusson
                                    ----------------------------
                                    Larry A. Rasmusson

                                    Print Name: Larry A. Rasmusson
                                                ------------------------
                                    Address:    1485 - 139th Lane NW
                                                ------------------------
                                                Andover, Minnesota  55304
                                                ------------------------

                                      4

<PAGE>

                                       OXBORO MEDICAL INTERNATIONAL, INC.


                                       By     /s/Dennis L. Mikkelson
                                          ------------------------------------
                                                Dennis L. Mikkelson
                                                Its Secretary and Director

                                       By     /s/John R. Walter
                                          ------------------------------------
                                                John R. Walter
                                                Its Director


                                      5

<PAGE>

                            SECURED PROMISSORY NOTE


$30,546.00                                                 Due January 15, 2003
                                                         Minneapolis, Minnesota

                                                               January 15, 1998


     The undersigned, for value received, promises to pay to the order of 
Oxboro Medical International, Inc., a Minnesota corporation (the "Lender"), 
at its main office in Ham Lake, Minnesota, in lawful money of the United 
States of America the principal sum of Thirty Thousand Five Hundred Forty-Six 
and No/100 Dollars ($30,546.00), together with interest (calculated on the 
basis of actual days elapsed and a 360-day year) on the unpaid principal 
hereof until this Note is fully paid at an annual rate of six (6%) percent.

     One-fifth of the original principal amount of this Note ($6,109.20) 
shall be paid on each of January 15, 1999, January 15, 2000, January 15, 
2001, January 15, 2002 and January 15, 2003, together with all interest 
accrued and unpaid as of each payment date.

     This Note is initially secured by certain shares of Common Stock of the 
Lender ("Collateral") pursuant to and is subject to the terms of a Stock 
Option Exercise and Loan Agreement dated January 15, 1998, and an Instruments 
Security Agreement of even date herewith.

     If any interest hereon or any principal amount hereof is not paid when 
due, then, in such event, the holder hereof may, at its option, transfer a 
number of shares held as Collateral equal to $30,546.00 plus interest accrued 
to the installment payment date divided by the per-share market value of the 
Stock as of the close of trading on the installment payment date, as payment 
thereof.

     This Note may be prepaid without penalty.

     This Note shall become automatically due and payable (including unpaid 
interest accrued hereon) without notice or demand should the undersigned:  
(i) fail to pay any or all of the Obligations (as defined in the Instruments 
Security Agreement) when due or shall fail to observe or perform any covenant 
or agreement herein or therein binding on it; (ii) any representation or 
warranty by the undersigned made to the Lender in any financial statements or 
reports submitted to the Lender by or on behalf of the undersigned shall 
prove materially false or misleading; (iii) a garnishment summons or a writ 
of attachment shall be issued against or served upon the Lender for the 
attachment of any property of the undersigned or any indebtedness owing to 
the undersigned; or (iv) the undersigned shall (A) be or become insolvent 
(however defined); or (B) 

<PAGE>

voluntarily file, or have filed against him involuntarily, a petition under 
the United States Bankruptcy Code; or (C) die.

     The undersigned agrees to pay all attorneys' fees and legal expenses as 
a result of the undersigned unsuccessfully contesting actions taken by the 
Lender hereunder in the event this Note is not paid.  Presentment or other 
demand for payment, notice of dishonor and protest are hereby waived by the 
undersigned.

     This Note shall be governed by the substantive laws of the State of 
Minnesota, except insofar as the Lender may rely on the laws of the United 
States to justify the interest rate charged hereunder.  The undersigned 
hereby irrevocably submits to the jurisdiction of the Minnesota District 
Court, Fourth Division, and the Federal District Court, District of 
Minnesota, Fourth Division, over any action or proceeding arising our of or 
relating to this Note and agrees that all claims in respect of such action or 
proceeding may be heard and determined in any such court.

                                          /s/Larry A. Rasmusson
                                       ---------------------------------
                                       Larry A. Rasmusson

                                      2


<PAGE>

                        INSTRUMENTS SECURITY AGREEMENT


                                                         DATE: January 15, 1998




DEBTOR                                                            SECURED PARTY

Larry A. Rasmusson                           Oxboro Medical International, Inc.
13828 Lincoln Street N.E.                             13828 Lincoln Street N.E.
Ham Lake, MN  55304                                         Ham Lake, MN  55304

_______________________________________________________________________________


     1.   SECURITY INTEREST AND COLLATERAL.  To secure the debt, liability or 
obligation of the Debtor to secured party evidenced by the following:  that 
certain Promissory Note dated January 15, 1998, and any extensions, renewals 
or replacements thereof (herein referred to as the "Obligations"), Debtor 
hereby grants Secured Party a security interest (herein called the "Security 
Interest") in the property owned by Debtor and held by Secured Party that is 
described as follows:  Share Certificate Nos. A-10007 and A-10008 of Oxboro 
Medical International, Inc., each representing 100,000 shares, together 
representing 200,000 shares, with all rights in connection with such property 
(herein called the "Collateral").

     2.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  Debtor represents, 
warrants and covenants that:

          (a)  Debtor will duly endorse, in blank, each and every instrument
     constituting Collateral by signing on said instrument or by signing a
     separate document of assignment or transfer, if required by Secured Party.
     
          (b)  Debtor is the owner of the Collateral free and clear of all
     liens, encumbrances, security interests and restrictions, except the
     Security Interest and any restrictive legend appearing on any instrument
     constituting Collateral.
     
          (c)  Debtor will keep the Collateral free and clear of all liens,
     encumbrances and security interests, except the Security Interest.
     
          (d)  Debtor will pay when due all taxes and other governmental charges
     levied or assessed upon or against any Collateral.

<PAGE>

          (e)  At any time, upon request by Secured Party, Debtor will deliver
     to Secured Party all notices, financial statements, reports or other
     communications received by Debtor as an owner or holder of the Collateral.

          (f)  Debtor will upon receipt deliver to Secured Party in pledge as
     additional Collateral all securities distributed on account of the
     Collateral such as stock dividends and securities resulting from stock
     splits, reorganizations and recapitalizations.

     3.   RIGHTS OF SECURED PARTY.  Debtor agrees that Secured Party may at 
any time, whether before or after the occurrence of an Event of Default and 
without notice or demand of any kind, (a) notify the obligor on or issue of 
any Collateral to make payment to Secured Party of any amounts due or 
distributable thereon, (b) in Debtor's name or Secured Party's name enforce 
collection of any Collateral by suit or otherwise, or surrender, release or 
exchange all or any part of it, or compromise, extend or renew for any period 
any obligation evidenced by the Collateral, (c) receive all proceeds of the 
Collateral, and (d) hold any increase or profits received from the Collateral 
as additional security for the Obligations, except that any money received 
from the Collateral shall, at Secured Party's option, be applied in reduction 
of the Obligations, in such order of application as Secured Party may 
determine, or be remitted to Debtor.

     4.   EVENTS OF DEFAULT.  Each of the following occurrences shall 
constitute an event of default under this Agreement (herein called "Event of 
Default"); (a) Debtor shall fail to observe or perform any covenant or 
agreement herein binding on him; (b) any representation or warranty by Debtor 
set forth in this Agreement shall prove materially false or misleading; (c) a 
garnishment summons or a writ of attachment shall be issued against or served 
upon the secured Party for the attachment of any property of the Debtor or 
any indebtedness owing to Debtor; or (d) Debtor shall (i) be or become 
insolvent (however defined); (ii) voluntarily file, or have filed against him 
involuntarily, a petition under the United States Bankruptcy Code; or (iii) 
die.

     5.   REMEDIES UPON EVENT OF DEFAULT.  Upon the occurrence of an Event of 
Default and at any time thereafter, Secured Party may exercise any one or 
more of the following rights or remedies:  (a) if any interest hereon or any 
principal amount hereof is not paid when due, then, in such event, the holder 
hereof may, at its option, transfer a number of shares held as Collateral 
equal to $40,000.00 plus interest accrued to the installment payment date 
divided by the per-share market value of the Stock as of the close of trading 
on the installment payment date, as payment thereof; (b) on January 15, 2003, 
declare all unmatured Obligations to be immediately due and payable, and the 
same shall thereupon be immediately due and payable, without presentment or 
other notice or demand; (c) exercise all voting and other rights as a holder 
of the Collateral; (d) exercise and enforce any or all rights and remedies 
available upon default to a secured party under the Uniform Commercial Code, 
including the right to offer and sell the Collateral privately to purchasers 
who will agree to take the Collateral for investment and not with a view to 
distribution and who will agree to the imposition of restrictive legends on 
the certificates representing the 

                                      2

<PAGE>

Collateral, and the right to arrange for a sale which would otherwise qualify 
as exempt from registration under the Securities Act of 1933; and if notice 
to Debtor of any intended disposition of the Collateral or any other intended 
action is required by law in a particular instance, such notice shall be 
deemed commercially reasonable if given at lease 10 calendar days prior to 
the date of intended disposition or other action; (e) exercise or enforce any 
or all other rights or remedies available to Secured Party by law or 
agreement against the Collateral, against Debtor or against any other person 
or property.  Upon the occurrence of the Event of Default described in 
Section 4(d)(ii), all Obligations shall be immediately due and payable 
without demand or notice thereof.  Any disposition of the Collateral in the 
manner provided in this Section 5 shall be deemed commercially reasonable.  
In the event Debtor fails to pay principal and accrued interest outstanding 
on January 15, 2003, then the sole remedy of the Secured Party shall be to 
cancel the Certification or Certificates representing the remaining 
Collateral or to sell said Collateral to a third party and, in either event, 
such cancelation or sale shall be in full and complete satisfaction of said 
outstanding principal and accrued interest and Debtor shall have no further 
obligation or liability to Secured Party under the Obligations.

     6.   MISCELLANEOUS.  This Agreement can be waived, modified, amended, 
terminated or discharged, and the Security Interest can be released, only 
explicitly in a writing signed by Secured Party.  A waiver signed by Secured 
Party shall be effective only in the specific instance and for the specific 
purpose given.  Mere delay or failure to act shall not preclude the exercise 
or enforcement of any of Secured Party's rights or remedies.  All rights and 
remedies of Secured Party shall be cumulative and may be exercised singularly 
or concurrently, at Secured Party's option, and the exercise or enforcement 
of any one such right or remedy shall neither be a condition to nor bar the 
exercise or enforcement of any other.

     All notices to be given to Debtor shall be deemed sufficiently given if 
delivered or mailed b registered or certified mail, postage prepaid, to 
Debtor at its address set forth above or at the most recent address shown on 
Secured Party's records.

     Secured Party's duty of care with respect to Collateral in its 
possession (as imposed by law) shall be deemed fulfilled if Secured Party 
exercises reasonable care in physically safekeeping such Collateral or, in 
the case of Collateral in the custody of possession of a bailee or other 
third person, exercises reasonable care in the selection of the bailee or 
other third person, and Secured Party need not otherwise preserve, protect, 
insure or care for any Collateral.  Secured Party shall not be obligated to 
preserve any rights Debtor may have against prior parties, to exercise at all 
or in any particular manner any voting rights which may be available with 
respect to any Collateral, to realize on the Collateral at all or in any 
particular manner or order, or to apply any cash proceeds of Collateral in 
any particular order of application. Debtor will reimburse Secured Party for 
all expenses (including reasonable attorneys' fees and legal expenses) 
incurred by Secured Party in the protection, defense or enforcement of the 
Security Interest, including expenses incurred in any litigation or 
bankruptcy or insolvency proceedings.

                                       3

<PAGE>

     This Agreement shall be binding upon and inure to the benefit of Debtor 
and Secured Party and their respective heirs, representatives, successors and 
assigns and shall take effect when signed by Debtor and delivered to Secured 
Party, and Debtor waives notice of Secured Party's acceptance hereof.

     This Agreement shall be governed by the substantive law of the State of 
Minnesota and, unless the context otherwise requires, all terms used herein 
which are defined in Articles 1 and 9 of the Uniform Commercial Code, as in 
effect in Minnesota, shall have the meanings therein stated.  If any 
provision or application of this Agreement is held unlawful or unenforceable 
in any respect, such illegality or unenforceability shall not affect other 
provisions or applications which can be given effect, and this Agreement 
shall be construed as if the unlawful or unenforceable provision or 
application had never been contained herein or prescribed hereby.

     All representations and warranties contained in this Agreement shall 
survive the execution, delivery and performance of this Agreement and the 
creation and payment of the Obligations.  The Debtor hereby irrevocably 
submits to the jurisdiction of the Minnesota District Court, Fourth Division, 
and the Federal District Court, District of Minnesota, Fourth Divisions, over 
any action or proceeding arising out of or relating to this Agreement and 
agrees that all claims in respect of such action or proceeding may be heard 
and determined in any such court.

SECURED PARTY                          DEBTOR

OXBORO MEDICAL INTERNATIONAL, INC.


By   /s/Dennis L. Mikkelson             /s/Larry    A. Rasmusson
  --------------------------------     -------------------------------
   Dennis L. Mikkelson                 Larry A. Rasmusson
   Title:  Secretary and Director


By    /s/John R. Walter
  -------------------------------
    John R. Walter
    Title:  Director

                                       4

<PAGE>

                      STOCK OPTION EXERCISE AND LOAN AGREEMENT


     THIS STOCK PURCHASE AGREEMENT, by and between Oxboro Medical International,
Inc., a Minnesota corporation (the "Company"), and Larry A. Rasmusson, an
individual residing in the State of Minnesota ("Rasmusson"), effective the 15th
day of January, 1998.


                                      RECITALS
                                      --------

     WHEREAS, Rasmusson desires to exercise an outstanding option to purchase
20,364 shares of the Company's Common Stock, $.01 per value (the "Shares"), for
a purchase price of $1.50 per Share; and 


     WHEREAS, the Company has agreed to lend funds to Rasmusson to pay the
purchase price of the Shares upon the terms and conditions set forth herein,


     NOW, THEREFORE, in consideration of the foregoing and the mutual promises
contained herein, the parties hereto agree as follows:


     1.   AGREEMENT FOR LOAN.  The Company agrees to lend to Rasmusson
$30,546.00 to purchase from the Company 20,364 shares of the Company's Common
Stock for $1.50 per share.  


     2.   EXERCISE OF OPTION.  Concurrently with the execution of this
Agreement, Rasmusson will exercise the option to purchase the Shares by (a)
delivery of a notice of option exercise, (b) execution and delivery of a
promissory note substantially in the form attached hereto as Exhibit A (the
"Note"), in the aggregate amount of $30,546.00, and (c) execution and delivery
of the Instruments Security Agreement attached hereto as Exhibit B (the
"Security Agreement"), together with the Collateral (as defined in the Security
Agreement).


     3.   REPRESENTATION AND WARRANTIES OF RASMUSSON.  Rasmusson hereby
represents and warrants to the Company as follows:

<PAGE>

          (a)  INFORMATION ABOUT THE COMPANY.  Rasmusson has received and is
     familiar with the Company's Annual Report for the year ended September 30,
     1997.  Rasmusson has had the opportunity to receive any additional
     information concerning the Company he considers necessary or advisable in
     order to form a decision concerning this investment and has either received
     such information or waived such opportunity.
     
     
          (b)  ABILITY TO BEAR THE RISK.  Given Rasmusson's current and
     reasonably foreseeable future economic circumstances, Rasmusson can, for an
     indefinite period of time, bear the economic risk inherent in the
     acquisition of the Shares and can afford to sustain a complete loss of such
     investment.
     
     
          (c)  BUSINESS SOPHISTICATION.  Rasmusson is experienced and
     knowledgeable in financial and business matters and capable of evaluating
     the merits and risks of purchasing the Shares.
     
     
          (d)  AFFILIATION WITH THE COMPANY.  Rasmusson is a consultant to the
     Company and is a member of its Board of Directors.
     
     
          (e)  HOLDING PERIOD UNDER RULE 144.  Rasmusson understands that his
     ownership of the Shares for purposes of calculating the "holding period"
     required for resales pursuant to Rule 144 under the Securities Act of 1933
     may not commence until the consideration for the particular Shares has been
     paid in full.
     
     
     4.   SECURITY FOR NOTE.  The Note will be secured by Shares of the
Company's Common Stock purchased by Rasmusson herein (the "Pledged Shares"). 
The Pledged Shares delivered or transferred to the Company shall be referred to
herein as the "Collateral."  To the extent that any portion of the Note is not
paid in accordance with the terms thereof, the Company shall have the right to
foreclose upon and redeem such portion of the Collateral as shall satisfy the
unpaid installment or portion of the Note.  Rasmusson agrees to execute and
deliver any documents that may be required to establish the Company's security
interest in the Collateral, including the certificates representing the Pledged
Shares.  This security interest shall not affect Rasmusson's rights to vote the
Pledged Shares or to receive dividends paid thereon.  However, any dividends
paid on Pledged Shares subject to this security interest shall be applied to the
amounts due on the Note, in such order of application as shall be determined by
the Company.  

                                      2

<PAGE>

The Company agrees to release its security interest in the Collateral, or the 
appropriate portion thereof, as the principal balance on the Note is paid.  
For purposes of releasing Pledged Shares from this Security Agreement, the 
Pledged Shares shall be valued at the then current market price.

     5.   INVESTMENT PURPOSE IN ACQUIRING THE SHARES.  Rasmusson and the 
Company acknowledge that the Shares have not been registered under the 
Securities Act of 1933, as amended (the "Act"), or the securities laws of any 
state or foreign jurisdiction and will be issued to Rasmusson in reliance on 
exemptions from the registration requirements of the Act and of applicable 
state securities laws and in reliance on Rasmusson's representations and 
agreements contained herein. Rasmusson is acquiring the Shares for his own 
account for investment purposes only and not with a view to their resale or 
distribution.  Rasmusson has no present intention to divide his participation 
with others or to resell or otherwise dispose of all or any part of the 
Shares.  In making these representations, Rasmusson understands that in the 
view of the Securities and Exchange Commission, exemption of the Shares from 
the registration requirements of the Act would not be available, if, 
notwithstanding the representations of Rasmusson, Rasmusson has in mind 
merely acquiring the Shares for resale upon the occurrence or nonoccurrence 
of some predetermined event.

     7.   COMPLIANCE WITH SECURITIES ACT.  Rasmusson agrees that if the 
Shares or any part thereof are sold or distributed in the future, Rasmusson 
shall sell or distribute them pursuant to the requirements of the Act and of 
appropriate state securities laws.  Rasmusson agrees that he will not 
transfer any part of the Shares without either (a) obtaining an opinion of 
counsel satisfactory in form and substance to counsel for the Company stating 
that the proposed transaction does not require registration under the Act or 
applicable state securities laws or (b) such registration.

     8.   RESTRICTIVE LEGEND.  Rasmusson agrees that the Company may place on 
the certificates representing the Shares a restrictive legend containing 
substantially the following language:

          The securities represented by this certificate have not been
          registered under the Securities Act of 1933, as amended,
          have not been registered under the securities laws of any
          state or foreign jurisdiction, and are subject to an
          investment letter.  They may not be sold, offered for sale,
          or transferred in the absence of either an effective
          registration under the Securities Act of 1933, as amended,

                                      3

<PAGE>

          and under the applicable state securities laws or an opinion
          of counsel for the Company that such transaction does not
          require registration under the Act or applicable state
          securities laws.


     9.   STOP TRANSFER ORDER.  Rasmusson agrees that the Company may place a
stop transfer order with its registrar and stock transfer agent (if any)
covering all certificates representing the Shares.


     10.  NO GUARANTEE OF CONTINUED SERVICE.  This Agreement shall not enlarge
or diminish any rights Rasmusson may have to serve as a director of the Company.


     11.  BINDING EFFECT.  Neither this Agreement nor any interest herein shall
be assignable by Rasmusson without the prior written consent of the Company. 
The provisions of this Agreement shall be binding upon and inure to the benefit
of the parties hereto and their respective heirs, legal representatives,
successors, and assigns.


     12.  REPRESENTATIONS TO SURVIVE DELIVERY.  The representations, warranties,
and agreements of Rasmusson contained in this Agreement will remain operative
and in full force and effect and will survive payment of the purchase price and
delivery of certificates representing the Shares.


     13.  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Minnesota.

     14.  NOTICES.  All notices, requests, demands and other communications
under this Agreement shall be in writing and shall be deemed to have been duly
given on the date of service if served personally on the party to whom it is
given; or on the third day after mailing if mailed to the party to whom notice
is to be given, by first-class mail, registered or certified, postage prepaid,
and properly addressed as follows:

          The Company:   13818 Lincoln Street N.E.
                         Ham Lake, MN  55304

          Rasmusson:     13818 Lincoln Street N.E.
                         Ham Lake, MN  55304

                                       4

<PAGE>

     IN WITNESS WHEREOF, the undersigned have duly executed this Agreement on
the day and year first above written.


                                         /s/Larry A. Rasmusson
                                       -------------------------------
                                       Larry A. Rasmusson

                                       Print Name:  Larry A. Rasmusson
                                                    --------------------------
                                       Address:     1485 - 139th Lane NW
                                                    --------------------------
                                                    Andover, Minnesota  55304
                                                    --------------------------


                                       OXBORO MEDICAL INTERNATIONAL, INC.


                                       By   /s/Dennis L. Mikkelson
                                          -------------------------------
                                            Dennis L. Mikkelson
                                            Its Secretary and Director


                                       By   /s/John R. Walter
                                          -------------------------------
                                            John R. Walter
                                            Its Director


                                       5

<PAGE>
                          SECURED PROMISSORY NOTE


$200,000.00                                              Due January 15, 2003
                                                       Minneapolis, Minnesota

                                                             January 15, 1998


     The undersigned, for value received, promises to pay to the order of 
Oxboro Medical International, Inc., a Minnesota corporation (the "Lender"), 
at its main office in Ham Lake, Minnesota, in lawful money of the United 
States of America the principal sum of Two Hundred Thousand and No/100 
Dollars ($200,000.00), together with interest (calculated on the basis of 
actual days elapsed and a 360-day year) on the unpaid principal hereof until 
this Note is fully paid at an annual rate of six (6%) percent.

     On-fifth of the original principal amount of this Note ($40,000.00) 
shall be paid on each of January 15, 1999, January 15, 2000, January 15, 
2001, January 15, 2002 and January 15, 2003, together with all interest 
accrued and unpaid as of each payment date.

     This Note is initially secured by certain shares of Common Stock of the 
Lender ("Collateral") pursuant to and is subject to the terms of a Stock 
Option Exercise and Loan Agreement dated January 15, 1998, and an Instruments 
Security Agreement of even date herewith.

     If any interest hereon or any principal amount hereof is not paid when 
due, then, in such event, the holder hereof may, at its option, transfer a 
number of shares held as Collateral equal to $40,000.00 plus interest accrued 
to the installment payment date divided by the per-share market value of the 
Stock as of the close of trading on the installment payment date, as payment 
thereof..

     This Note may be prepaid without penalty.

     This Note shall become automatically due and payable (including unpaid 
interest accrued hereon) without notice or demand should the undersigned:  
(i) fail to pay any or all of the Obligations (as defined in the Instruments 
Security Agreement) when due or shall fail to observe or perform any covenant 
or agreement herein or therein binding on it; (ii) any representation or 
warranty by the undersigned made to the Lender in any financial statements or 
reports submitted to the Lender by or on behalf of the undersigned shall 
prove materially false or misleading; (iii) a garnishment summons or a writ 
of attachment shall be issued against or served upon the Lender for the 
attachment of any property of the undersigned or any indebtedness owing to 
the undersigned; (iv) the undersigned shall (A) be or become insolvent 
(however defined); or (B)


<PAGE>

voluntarily file, or have filed against it involuntarily, a petition under 
the United States Bankruptcy Code; or (C) die.

          The undersigned agrees to pay all attorneys' fees and legal 
expenses as a result of the undersigned unsuccessfully contesting actions 
taken by the Lender in the event this Note is not paid when due.  Presentment 
or other demand for payment, notice of dishonor and protest are hereby waived 
by the undersigned.

     This Note shall be governed by the substantive laws of the State of 
Minnesota, except insofar as the Lender may rely on the laws of the United 
States to justify the interest rate charged hereunder.  The undersigned 
hereby irrevocably submits to the jurisdiction of the Minnesota District 
Court, Fourth Division, and the Federal District Court, District of 
Minnesota, Fourth Division, over any action or proceeding arising our of or 
relating to this Note and agrees that all claims in respect of such action or 
proceeding may be heard and determined in any such court.


                                        /s/ Larry A. Rasmusson
                                     -------------------------------------
                                     Larry A. Rasmusson


                                      2

<PAGE>

                         INSTRUMENTS SECURITY AGREEMENT


                                                         DATE: January 15, 1998


DEBTOR                                                            SECURED PARTY

Larry A. Rasmusson                           Oxboro Medical International, Inc.
13828 Lincoln Street N.E.                             13828 Lincoln Street N.E.
Ham Lake, MN  55304                                         Ham Lake, MN  55304

______________________________________________________________________________

     1.   SECURITY INTEREST AND COLLATERAL.  To secure the debt, liability or
obligation of the Debtor to secured party evidenced by the following:  that
certain Promissory Note dated January 15, 1998, and any extensions, renewals or
replacements thereof (herein referred to as the "Obligations"), Debtor hereby
grants Secured Party a security interest (herein called the "Security Interest")
in the property owned by Debtor and held by Secured Party that is described as
follows:  Share Certificate No. A-10005 of Oxboro Medical International, Inc.,
representing 20,364 shares, with all rights in connection with such property
(herein called the "Collateral").

     2.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  Debtor represents,
warrants and covenants that:

          (a)  Debtor will duly endorse, in blank, each and every instrument
     constituting Collateral by signing on said instrument or by signing a
     separate document of assignment or transfer, if required by Secured Party.
     
          (b)  Debtor is the owner of the Collateral free and clear of all
     liens, encumbrances, security interests and restrictions, except the
     Security Interest and any restrictive legend appearing on any instrument
     constituting Collateral.
     
          (c)  Debtor will keep the Collateral free and clear of all liens,
     encumbrances and security interests, except the Security Interest.
     
          (d)  Debtor will pay when due all taxes and other governmental charges
     levied or assessed upon or against any Collateral.

<PAGE>

          (e)  At any time, upon request by Secured Party, Debtor will deliver
     to Secured Party all notices, financial statements, reports or other
     communications received by Debtor as an owner or holder of the Collateral.
     
          (f)  Debtor will upon receipt deliver to Secured Party in pledge as
     additional Collateral all securities distributed on account of the
     Collateral such as stock dividends and securities resulting from stock
     splits, reorganizations and recapitalizations.
     
     3.   RIGHTS OF SECURED PARTY.  Debtor agrees that Secured Party may at any
time, whether before or after the occurrence of an Event of Default and without
notice or demand of any kind, (a) notify the obligor on or issue of any
Collateral to make payment to Secured Party of any amounts due or distributable
thereon, (b) in Debtor's name or Secured Party's name enforce collection of any
Collateral by suit or otherwise, or surrender, release or exchange all or any
part of it, or compromise, extend or renew for any period any obligation
evidenced by the Collateral, (c) receive all proceeds of the Collateral, and (d)
hold any increase or profits received from the Collateral as additional security
for the Obligations, except that any money received from the Collateral shall,
at Secured Party's option, be applied in reduction of the Obligations, in such
order of application as Secured Party may determine, or be remitted to Debtor.

     4.   EVENTS OF DEFAULT.  Each of the following occurrences shall constitute
an event of default under this Agreement (herein called "Event of Default"); (a)
Debtor shall fail to observe or perform any covenant or agreement herein binding
on him; (b) any representation or warranty by Debtor set forth in this Agreement
shall prove materially false or misleading; (c) a garnishment summons or a writ
of attachment shall be issued against or served upon the secured Party for the
attachment of any property of the Debtor or any indebtedness owing to Debtor; or
(d) Debtor shall (i) be or become insolvent (however defined); (ii) voluntarily
file, or have filed against him involuntarily, a petition under the United
States Bankruptcy Code; or (iii) die.

     5.   REMEDIES UPON EVENT OF DEFAULT.  Upon the occurrence of an Event of
Default and at any time thereafter, Secured Party may exercise any one or more
of the following rights or remedies:  (a) if any interest hereon or any
principal amount hereof is not paid when due, then, in such event, the holder
hereof may, at its option, transfer a number of shares held as Collateral equal
to $6,190.20 plus interest accrued to the installment payment date divided by
the per-share market value of the Stock as of the close of trading on the
installment payment date, as payment thereof; (b) on January 15, 2003, declare
all unmatured Obligations to be immediately due and payable, and the same shall
thereupon be immediately due and payable, without presentment or other notice or
demand; (c) exercise all voting and other rights as a holder of the Collateral;
(d) exercise and enforce any or all rights and remedies available upon default
to a secured party under the Uniform Commercial Code, including the right to
offer and sell the Collateral privately to purchasers who will agree to take the
Collateral for investment and not with a view to distribution and who will agree
to the imposition of restrictive legends on the certificates representing the

                                       2

<PAGE>

Collateral, and the right to arrange for a sale which would otherwise qualify 
as exempt from registration under the Securities Act of 1933; and if notice 
to Debtor of any intended disposition of the Collateral or any other intended 
action is required by law in a particular instance, such notice shall be 
deemed commercially reasonable if given at lease 10 calendar days prior to 
the date of intended disposition or other action; (e) exercise or enforce any 
or all other rights or remedies available to Secured Party by law or 
agreement against the Collateral, against Debtor or against any other person 
or property.  Upon the occurrence of the Event of Default described in 
Section 4(d)(ii), all Obligations shall be immediately due and payable 
without demand or notice thereof.  Any disposition of the Collateral in the 
manner provided in this Section 5 shall be deemed commercially reasonable.  
In the event Debtor fails to pay principal and accrued interest outstanding 
on January 15, 2003, then the sole remedy of the Secured Party shall be to 
cancel the Certification or Certificates representing the remaining 
Collateral or to sell said Collateral to a third party and, in either event, 
such cancelation or sale shall be in full and complete satisfaction of said 
outstanding principal and accrued interest and Debtor shall have no further 
obligation or liability to Secured Party under the Obligations.

     6.   MISCELLANEOUS.  This Agreement can be waived, modified, amended, 
terminated or discharged, and the Security Interest can be released, only 
explicitly in a writing signed by Secured Party.  A waiver signed by Secured 
Party shall be effective only in the specific instance and for the specific 
purpose given.  Mere delay or failure to act shall not preclude the exercise 
or enforcement of any of Secured Party's rights or remedies.  All rights and 
remedies of Secured Party shall be cumulative and may be exercised singularly 
or concurrently, at Secured Party's option, and the exercise or enforcement 
of any one such right or remedy shall neither be a condition to nor bar the 
exercise or enforcement of any other.

     All notices to be given to Debtor shall be deemed sufficiently given if 
delivered or mailed b registered or certified mail, postage prepaid, to 
Debtor at its address set forth above or at the most recent address shown on 
Secured Party's records.

     Secured Party's duty of care with respect to Collateral in its 
possession (as imposed by law) shall be deemed fulfilled if Secured Party 
exercises reasonable care in physically safekeeping such Collateral or, in 
the case of Collateral in the custody of possession of a bailee or other 
third person, exercises reasonable care in the selection of the bailee or 
other third person, and Secured Party need not otherwise preserve, protect, 
insure or care for any Collateral.  Secured Party shall not be obligated to 
preserve any rights Debtor may have against prior parties, to exercise at all 
or in any particular manner any voting rights which may be available with 
respect to any Collateral, to realize on the Collateral at all or in any 
particular manner or order, or to apply any cash proceeds of Collateral in 
any particular order of application. Debtor will reimburse Secured Party for 
all expenses (including reasonable attorneys' fees and legal expenses) 
incurred by Secured Party in the protection, defense or enforcement of the 
Security Interest, including expenses incurred in any litigation or 
bankruptcy or insolvency proceedings.

                                      3

<PAGE>

     This Agreement shall be binding upon and inure to the benefit of Debtor and
Secured Party and their respective heirs, representatives, successors and
assigns and shall take effect when signed by Debtor and delivered to Secured
Party, and Debtor waives notice of Secured Party's acceptance hereof.

     This Agreement shall be governed by the substantive law of the State of
Minnesota and, unless the context otherwise requires, all terms used herein
which are defined in Articles 1 and 9 of the Uniform Commercial Code, as in
effect in Minnesota, shall have the meanings therein stated.  If any provision
or application of this Agreement is held unlawful or unenforceable in any
respect, such illegality or unenforceability shall not affect other provisions
or applications which can be given effect, and this Agreement shall be construed
as if the unlawful or unenforceable provision or application had never been
contained herein or prescribed hereby.

     All representations and warranties contained in this Agreement shall
survive the execution, delivery and performance of this Agreement and the
creation and payment of the Obligations.  The Debtor hereby irrevocably submits
to the jurisdiction of the Minnesota District Court, Fourth Division, and the
Federal District Court, District of Minnesota, Fourth Divisions, over any action
or proceeding arising out of or relating to this Agreement and agrees that all
claims in respect of such action or proceeding may be heard and determined in
any such court.



SECURED PARTY                          DEBTOR

OXBORO MEDICAL INTERNATIONAL, INC.


By  /s/Dennis L. Mikkelson                   /s/Larry A. Rasmusson
  ----------------------------------       ------------------------------
   Dennis L. Mikkelson                     Larry A. Rasmusson
   Title:  Secretary and Director

By   /s/John R. Walter
  ----------------------------------
   John R. Walter
   Title:  Director

                                       4


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