Document:

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                                                                   EXHIBIT 10.13

August 26, 1999

Blair Mowery
CV Dynamics, Inc. dba Medical Incorporated
9605 West Jefferson Trail
Inver Grove Heights, MN 55077

Dear Blair:

Riverside Bank (the "Bank") is pleased to provide this revised financing
commitment to CV Dynamics, Inc. (the "Borrower") for your consideration. The
terms and conditions are as follows:

<Table>
<Caption>
<S>                   <C>
FACILITY 1
Amount:               $850,000 SBA Export Working Capital Line of Credit
Rate:                 Wall Street Journal Prime rate, adjusted daily.
Fees:                 $8,500 origination fee payable to the Bank, $1,000
                      packaging fee payable to the Bank, $1,875 guaranty fee
                      payable to the SBA.
Term:                 One year note, interest payments due monthly.
Collateral:           First security interest in Accounts Receivable, Second
                      security interest in all business assets.
Guarantor:            None.
Use of Proceeds:      Finance new customer orders.  Advances will be limited to
                      80% of eligible accounts receivable per a weekly borrowing
                      base certificate.
Prepayment:           No penalty.

FACILITY 2
Amount:               $2,500,000 Revolving Offer to Lend.
Rate:                 Wall Street Journal Prime rate, adjusted daily.
Fees:                 $25,000 commitment fee payable to the Bank.
Term:                 One year note, interest only payments due monthly.
                      Based on your actual note usage and anticipated
                      future cash needs, the Bank is willing to term out
                      this note at maturity on a three year term and
                      maximum 15 year amortization at the same interest
                      rate.
Collateral:           First real estate mortgage on commercial property located
                      in Inver Grove Heights, first security interest in all
                      business assets, excluding accounts receivable. $1,350,000
                      of marketable securities pledged by Paul Miller.
Guarantor:            $2,000,000 personal guaranty of Paul Miller.
Use of Proceeds:      Payoff Norwest first mortgage of approximately $650,000
                      and finance future working capital growth.
Prepayment:           No penalty.

</Table>

In addition, this commitment is subject to the following terms and conditions:

         1.       THE BANK REQUIRES THE RECEIPT OF QUARTERLY INTERNALLY PREPARED
                  FINANCIAL STATEMENTS, WEEKLY BORROWING BASE CERTIFICATES (ONLY
                  ON FACILITY 1), MONTHLY ACCOUNTS RECEIVABLE AND ACCOUNTS
                  PAYABLE AGINGS, ANNUAL CPA AUDITED FINANCIAL STATEMENTS, AND
                  ANNUAL PERSONAL FINANCIAL STATEMENTS ON THE GUARANTOR. It is
                  also common for our customers to provide us a monthly cash
                  flow budget annually.

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         2.       THE BANK REQUIRES THE RECEIPT OF INSURANCE CERTIFICATES
                  PROVIDING EVIDENCE OF APPROPRIATE INSURANCE COVERAGE ON THE
                  COLLATERAL WITH THE BANK NAMED AS ADDITIONAL INSURED.

         3.       THE BANK REQUIRES THE RECEIPT OF THE JULY 31, 1999 INTERNAL
                  STATEMENT. These results must be substantially on projections.

         4.       THE BANK REQUIRES THE RECEIPT OF THE APRIL 30, 1999 AUDITED
                  FINANCIAL STATEMENT.

         5.       THE BANK REQUIRES THE EXECUTION OF A LOAN AGREEMENT, ALONG
                  WITH OTHER STANDARD DOCUMENTS, WITH THE INCLUSION OF A
                  TANGIBLE NET WORTH FLOOR OF $3,000,000 AS OF APRIL 30, 1999
                  AND QUARTERLY THEREAFTER.

         6.       THE BANK REQUIRES THAT CV DYNAMICS PAY ALL CLOSING COSTS,
                  INCLUDING, BUT NOT LIMITED TO, LEGAL, APPRAISAL,
                  ENVIRONMENTAL, AND TITLE FEES. We would expect these costs to
                  be approximately $5,500 for the appraisal, $1,500 for the
                  environmental phase I, and $6,200 for the title and mortgage
                  filing costs. Legal costs could be as low as $1,000.00, but
                  may be higher depending on whether the Loan Agreement and
                  other documents are drafted by Bank legal counsel.

         7.       THE BANK REQUIRES A Y2K QUESTIONNAIRE BE COMPLETED.

         8.       THE BANK REQUIRES THE APPROVAL OF THE SBA ON FACILITY 1.

         9.       THE BANK REQUIRES THE RECEIPT OF PAUL MILLER'S PERSONAL
                  FINANCIAL STATEMENT AND 1997 TAX RETURN.

         10.      THE BANK REQUIRES THE MAINTENANCE OF ALL BORROWER DEPOSITORY
                  ACCOUNTS. We offer several innovative cash management products
                  and would like to explain these to you in more detail. These
                  products include receivable lock box processing and Execubank
                  on line banking.

The Bank estimates being able to close in approximately 8 weeks. The appraisal
will take 4-6 weeks while the Bank will need an additional 2 weeks to prepare
documents and provide them to you for your review. Therefore, a bridge loan of
$1,000,000 can be made readily available. This note will be secured by the same
marketable securities to be pledged by Paul Miller.

Facilities 1 and 2 represent a total financing package for your consideration,
but you may accept facility 2 alone. Facility 1 will remain committed to you
during the Facility 2 note term unless there are any conditions of default on
Facility 2. Depending on your anticipated cash needs over the next 6-12 months,
we are also willing to consider a financing request under the Export Import Bank
programs.

By your acknowledgment of this letter, you agree not to directly disclose,
divulge, publish, disseminate or otherwise make available any portion of this
letter to any person (including, without limitation, any lender or
representative of any lender other than Riverside Bank) other than employees of
CV Dynamics who have a need to know its contents to perform their duties as
employees. You also agree to instruct such employees to hold the content of this
letter in strictest confidence.

This commitment shall be deemed binding upon the Bank only if the Bank receives
an unqualified acceptance by the Borrower of the terms and conditions contained
herein, evidenced by the Borrower properly executing this document below and
delivering it to the Bank, together with the applicable nonrefundable commitment
fee, on or before September 3, 1999.

I have enjoyed our brief business relationship and look forward to our ongoing
working relationship. Please call me at 531-4963 with any questions.

                                       2
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                                             Very truly yours,

                                             /s/ Roger D. Hamilton
                                             ---------------------
                                             Roger D. Hamilton
                                             Vice President

We agree to the conditions set forth in this loan commitment and enclose a check
for the non-refundable commitment fee.

                                             Acknowledged and agreed:

                                             CV DYNAMICS, INC.

                                             By /s/ Adel A. Mikhail
                                                --------------------------------

                                             Its: President/CEO
                                                  ------------------------------

                                             Dated: September 1, 1999
                                                    ----------------------------

                                       3<Page>

                                                                   EXHIBIT 10.14

                            CHANGE IN TERMS AGREEMENT

<Table>
<S>                 <C>        <C>           <C>         <C>    <C>          <C>        <C>       <C>
-----------------------------------------------------------------------------------------------------------
    PRINCIPAL        LOAN       MATURITY     LOAN NO.    CALL   COLLATERAL   ACCOUNT    OFFICER    INITIALS
  $2,500,000.00      DATE      11-23-2002    90510600     17       4000      129774       RDH
-----------------------------------------------------------------------------------------------------------
References in the shaded area are for Lender's use only and do not limit the
applicability of this document to any particular loan or item.
-------------------------------------------------------------------------------------------------------------------------------

BORROWER:    MEDICAL CV, INC. FKA CV DYNAMICS, INC.                         LENDER:   ASSOCIATED BANK MINNESOTA
             9605 WEST JEFFERSON TRAIL                                                NORTHLAND PARK OFFICE
             INVER GROVE HEIGHTS, MN 55077                                            7100 NORTHLAND CIRCLE, SUITE 102
                                                                                      BROOKLYN PARK, MN 55428

=========================================================================== ===================================================
</Table>

PRINCIPAL AMOUNT:  $2,500,000.00          DATE OF AGREEMENT:  NOVEMBER 23, 2000

DESCRIPTION OF EXISTING INDEBTEDNESS. PROMISSORY NOTE #90510600 DATED NOVEMBER
23, 1999 IN THE ORIGINAL AMOUNT OF $2,500,000.00.

DESCRIPTION OF COLLATERAL. LEUTHOLD CORE INVESTMENT FUND PLEDGED BY PAUL K.
MILLER PER A COMMERCIAL PLEDGE AND SECURITY AGREEMENT DATED NOVEMBER 23, 1999.
REAL PROPERTY LOCATED AT 9605 WEST JEFFERSON TRAIL, INVER GROVE HEIGHTS,
MINNESOTA, PER A MORTGAGE, SECURITY AGREEMENT, FIXTURE STATEMENT, AND ASSIGNMENT
OF LEASES AND RENTS DATED NOVEMBER 23, 1999. ALL CORPORATE ASSETS, EXCLUDING
ACCOUNTS RECEIVABLE, PER A COMMERCIAL SECURITY AGREEMENT DATED NOVEMBER 23,
1999. ALL FIXTURES PER A COMMERCIAL SECURITY AGREEMENT DATED NOVEMBER 23, 1999.

DESCRIPTION OF CHANGE IN TERMS.  WORKING CAPITAL LINE OF CREDIT.

PROMISE TO PAY, MEDICAL CV, INC. FKA CV DYNAMICS, INC. ("BORROWER") PROMISES TO
PAY TO ASSOCIATED BANK MINNESOTA ("LENDER"), OR ORDER, IN LAWFUL MONEY OF THE
UNITED STATES OF AMERICA, THE PRINCIPAL AMOUNT OF TWO MILLION FIVE HUNDRED
THOUSAND & 00/100 DOLLARS ($2,500,000.00) OR SO MUCH AS MAY BE OUTSTANDING,
TOGETHER WITH INTEREST ON THE UNPAID OUTSTANDING PRINCIPAL BALANCE OF EACH
ADVANCE. INTEREST SHALL BE CALCULATED FROM THE DATE OF EACH ADVANCE UNTIL
REPAYMENT OF EACH ADVANCE.

PAYMENT. BORROWER WILL PAY THIS LOAN IN ONE PAYMENT OF ALL OUTSTANDING PRINCIPAL
PLUS ALL ACCRUED UNPAID INTEREST ON NOVEMBER 23, 2002. IN ADDITION, BORROWER
WILL PAY REGULAR MONTHLY PAYMENTS OF ACCRUED UNPAID INTEREST BEGINNING DECEMBER
23, 2000, AND ALL SUBSEQUENT INTEREST PAYMENTS ARE DUE ON THE SAME DAY OF EACH
MONTH AFTER THAT. The annual interest rate for this Agreement is computed on a
365/360 basis; that is, by applying the ratio of the annual interest rate over a
year of 360 days, multiplied by the outstanding principal balance, multiplied by
the actual number of days the principal balance is outstanding. Borrower will
pay Lender at Lender's address shown above or at such other place as Lender may
designate in writing. Unless otherwise agreed or required by applicable law,
payments will be applied first to accrued unpaid interest, then to principal,
and any remaining amount to any unpaid collection costs and late charges.

VARIABLE INTEREST RATE. The interest rate on this Agreement is subject to change
from time to time based on changes in an independent index which is the PRIME
RATE OF INTEREST AS PUBLISHED EACH BUSINESS DAY IN THE MONEY RATES SECTION OF
THE WALL STREET JOURNAL (the "Index"). The Index is not necessarily the lowest
rate charged by Lender on its loans. If the Index becomes unavailable during the
term of this loan, Lender may designate a substitute index after notice to
Borrower. Lender will tell Borrower the current Index rate upon Borrower's
request. Borrower understands that Lender

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                                                                          Page 2

may make loans based on other rates as well. The interest rate change will
not occur more often than each DAY. THE INDEX CURRENTLY IS 9.500% PER ANNUM.
THE INTEREST RATE TO BE APPLIED TO THE UNPAID PRINCIPAL BALANCE OF THIS
AGREEMENT WILL BE AT A RATE EQUAL TO THE INDEX, RESULTING IN AN INITIAL RATE
OF 9.500% PER ANNUM. NOTICE: Under no circumstances will the interest rate on
this Agreement be more than the maximum rate allowed by applicable law.

PREPAYMENT. Borrower may pay without penalty all or a portion of the amount
owed earlier than it is due. Early payment will not, unless agreed to by
Lender in writing, relieve Borrower or Borrower's obligation to continue to
make payments of accrued unpaid interest. Rather, they will reduce the
principal balance due.

LATE CHARGE. If a payment is 10 DAYS OR MORE LATE, Borrower will be charged
5.000% OF THE UNPAID PORTION OF THE REGULARLY SCHEDULE PAYMENT.

DEFAULT. Borrower will be in default if any of the following happens: (a)
Borrower fails to make any payment when due. (b) Borrower breaks any promise
Borrower has made to Lender, or Borrower fails to comply with or to perform
when due any other term, obligation, covenant, or condition contained in this
Agreement or any agreement related to this Agreement, or in any other
agreement or loan Borrower has with Lender. (c) Borrower defaults under any
loan, extension of credit, security agreement, purchase or sales agreement,
or any other agreement, in favor of any other creditor or person that may
materially affect any of Borrower's property or Borrower's ability to repay
this Note or perform Borrower's obligations under this Note or any of the
Related Documents. (d) Any representation or statement made or furnished to
Lender by Borrower or on Borrower's behalf is false or misleading in any
material respect either now or at the time made or furnished. (e) Borrower
becomes insolvent, a receiver is appointed for any part of Borrower's
property, Borrower makes an assignment for the benefit of creditors, or any
proceeding is commenced either by Borrower or against Borrower under any
bankruptcy or insolvency laws. (f) Any creditor tries to take any of
Borrower's property on or in which Lender has a lien or security interest.
This includes a garnishment of any of Borrower's accounts with Lender. (g)
Any guarantor dies or any of the other events described in this default
section occurs with respect to any guarantor of this Agreement. (h) A
material adverse change occurs in Borrower's financial condition, or Lender
believes the prospect of payment or performance of the Indebtedness is
impaired. (i) Failure to meet the deadlines required in the Year 2000
Compliance Agreement to be Year 2000 Compliant or a reasonable likelihood
that Borrower cannot be Year 2000 Compliant on or before December 31, 1999.
(j) Lender in good faith deems itself insecure.

If any default, other than a default in payment, is curable and if Borrower
has not been given a notice of a breach of the same provision of this
Agreement within the preceding twelve (12) months, it may be cured (and no
event of default will have occurred) if Borrower, after receiving written
notice from Lender demanding cure of such default: (a) cures the default
within fifteen (15) days; or (b) if the cure requires more than fifteen
(15) days, immediately initiates steps which Lender deems in Lender's sole
discretion to be sufficient to cure the default and thereafter continues and
completes all reasonable and necessary steps sufficient to produce compliance
as soon as reasonably practical.

LENDER'S RIGHTS. Upon default, Lender may declare the entire unpaid principal
balance on this Agreement and all accrued unpaid interest immediately due,
without notice, and then Borrower will pay that amount. Upon default,
including failure to pay upon final maturity, Lender, at its option, may
also, if permitted under applicable law, increase the variable interest rate
on this Agreement to 2.000 percentage points over the Index. The interest
rate will not exceed the maximum rate permitted by applicable law. Lender may
hire or pay someone else to help collect this Agreement if Borrower does not
pay. Borrower also will pay Lender that amount. This includes, subject to any
limits under applicable law, Lender's attorneys' fees and Lender's legal
expenses whether or not there is a lawsuit, including attorneys' fees and
legal expenses for bankruptcy proceedings (including efforts to modify or
vacate any automatic stay or injunction), appeals, and any anticipated
post-judgment collection services. If not prohibited by applicable law,
Borrower also will pay any court costs, in addition to all other sums
provided by law. THIS AGREEMENT HAS BEEN DELIVERED TO LENDER AND ACCEPTED BY
LENDER IN THE STATE OF MINNESOTA. IF THERE IS A LAWSUIT, BORROWER AGREES UPON
LENDER'S REQUEST TO SUBMIT TO THE JURISDICTION OF THE COURTS OF HENNEPIN
COUNTY, THE STATE OF

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                                                                          Page 3

MINNESOTA. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF MINNESOTA.

RIGHT OF SETOFF. Borrower grants to Lender a contractual security interest
in, and hereby assigns, conveys, delivers, pledges, and transfers to Lender
all Borrower's right, title and interest in and to, Borrower's accounts with
Lender (whether checking, savings, or some other account), including without
limitation all accounts held jointly with someone else and all accounts
Borrower may open in the future, excluding however, all IRA and Keogh
accounts, and all trust accounts for which the grant of a security interest
would be prohibited by law. Borrower authorizes Lender, to the extent
permitted by applicable law, to charge or setoff all sums owing on this
Agreement against any and all such accounts.

LINE OF CREDIT. This Agreement evidences a revolving line of credit. Advances
under this Agreement may be requested either orally or in writing by Borrower
or by an authorized person. Lender may, but need not, require that all oral
requests be confirmed in writing. All communications, instructions, or
directions by telephone or otherwise to Lender are to be directed to Lender's
office shown above. Borrower agrees to be liable for all sums either: (a)
advanced in accordance with the instructions of an authorized person or (b)
credited to any of Borrower's accounts with Lender. The unpaid principal
balance owing on this Agreement at any time may be evidenced by endorsements
on this Agreement or by Lender's internal records, including daily computer
print-outs. Lender will have no obligation to advance funds under this
Agreement if: (a) Borrower or any guarantor is in default under the terms of
this Agreement or any agreement that Borrower or any guarantor has with
Lender, including any agreement made in connection with the signing of this
Agreement; (b) Borrower or any guarantor ceases doing business or is
insolvent; (c) any guarantor seeks, claims or otherwise attempts to limit,
modify or revoke such guarantor's guarantee of this Agreement or any other
loan with Lender; (d) Borrower has applied funds provided pursuant to this
Agreement for purposes other than those authorized by Lender; or (e) Lender
in good faith deems itself insecure under this Agreement or any other
agreement between Lender and Borrower.

CONTINUING VALIDITY. Except as expressly changed by this Agreement, the terms
of the original obligation or obligations, including all agreements evidenced
or securing the obligation(s), remain unchanged and in full force and effect.
Consent by Lender to this Agreement does not waive Lender's right to strict
performance of this obligation(s) as changed, nor obligate Lender to make any
future change in terms. Nothing in this Agreement will constitute a
satisfaction of the obligation(s). It is the intention of Lender to retain as
liable parties all makers and endorsers of the original obligation(s),
including accommodation parties, unless a party is expressly released by
Lender in writing. Any maker or endorser, including accommodation makers,
will not be released by virtue of this Agreement. If any person who signed
the original obligation does not sign this Agreement below, then all persons
signing below acknowledge that this Agreement is given conditionally, based
on the representation to Lender that the non-signing party consents to the
changes and provisions of this Agreement or otherwise will not be released by
it. This waiver applies not only to any initial extension, modification or
release, but also to all such subsequent actions.

SECURITIES DEFAULT. IF THE CURRENT MARKET VALUE OF THE SECURITIES PLEDGED AS
COLLATERAL TO THIS LOAN DECREASES TO LESS THAN $1,100,000.00, THE LOAN WILL
BE IN DEFAULT. MARKET VALUE TODAY IS $1,520,593.00.

CONTINUING GUARANTY. A COMMERCIAL GUARANTY SIGNED BY PAUL K. MILLER DATED
NOVEMBER 23, 1999.

MISCELLANEOUS PROVISIONS. Lender may delay or forgo enforcing any of its rights
or remedies under this Agreement without losing them. Borrower and any other
person who signs, guarantees or endorses this Agreement, to the extent allowed
by law, waive presentment, demand for payment, protest and notice of dishonor.
Upon any change in the terms of this Agreement, and unless otherwise expressly
stated in writing, no party who signs this Agreement, whether as maker,
guarantor, accommodation maker or endorser, shall be released from liability.
All such parties agree that Lender may renew or extend (repeatedly and for any
length of time) this loan, or release any party or guarantor or collateral; or
impair, fail to realize upon or perfect Lender's security interest in the
collateral; and take any other action deemed necessary by Lender without the

<Page>
                                                                          Page 4

consent of or notice to anyone. All such parties also agree that Lender may
modify this loan without the consent of or notice to anyone other than the
party with whom the modification is made.

SECTION DISCLOSURE.  This loan is made under Minnesota Statutes,
Section 47.59.

PRIOR TO SIGNING THIS AGREEMENT, BORROWER READ AND UNDERSTOOD ALL THE
PROVISIONS OF THIS AGREEMENT, INCLUDING THE VARIABLE INTEREST RATE
PROVISIONS. BORROWER AGREES TO THE TERMS OF THE AGREEMENT AND ACKNOWLEDGES
RECEIPT OF A COMPLETED COPY OF THE AGREEMENT.

BORROWER:

MEDICAL CV, INC. FKA CV DYNAMICS, INC.

By:  /s/ Adel A. Mikhail                   By:  /s/ Gene Stobbs
     -------------------                        ---------------
     Adel A. Mikhail, President/CEO             Gene Stobbs, Vice President Of
                                                Operations

By:  /s/ George M. Wettstaedt
     ------------------------
     George M. Wettstaedt, CFO

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