Document:

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Exhibit 10.15

               Norwest Bank Minnesota North, National Association

                      Fourth Amendment to Credit Agreement

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THIS FOURTH AMENDMENT TO CREDIT AGREEMENT (the "Amendment") is dated as of the
1st day of June 2000, and is by and between A.S.V., Inc. (the "Borrower") and
Norwest Bank Minnesota North, --- --------- National Association, a national
banking association (the "Bank").

REFERENCE IS HEREBY MADE to that certain Credit Agreement dated May 22, 1997
(the "Agreement") and First Amendment to Credit Agreement dated June 30, 1998
and Second Amendment to Credit Agreement dated January 25, 1999 and Third
Amendment to Credit Agreement dated June 9, 1999, ("the Agreement") whereby the
Bank agreed to provide a Ten Million and 00/100 Dollars ($10,000,000.00) line of
credit to be used for working capital with a Line Expiration Date of the earlier
of Demand or June 1, 2000.

WHEREAS, the Bank is willing to grant the Borrower's request, subject to the
provisions of the Amendment;

NOW, THEREFORE, the Bank and the Borrower agree as follows:

1.       All references in the Agreement to the Line Expiration Date of June 1,
         2000 are hereby amended to on the earlier of DEMAND or June 1, 2001.

2.       Page 6, Tangible Net Worth, of the Agreement is amended in its entirety
         as follows: Maintain a minimum Tangible Net Worth of at least
         $38,500,000.00 as of the end of each fiscal year.

THE BORROWER hereby represents and warrants to the Bank as follows:

         A. The Agreement constitutes a valid, legal and binding obligation owed
         by the Borrower to the Bank, subject to no counterclaim, defense,
         offset, abatements or recoupment.

         B. As of the date of the Amendment, (i) all of the representations and
         warranties contained in the Agreement are true and (ii) there exists no
         Event of Default and no event which, with the giving of notice or the
         passage of time, or both, could become an Event of Default.

         C. The execution, delivery and performance of this Amendment by the
         Borrower are within its corporate powers, have been duly authorized,
         and are not in contravention of law or the terms of the Borrower's
         Articles of Incorporation or by-laws, or of any undertaking to which
         the Borrower is a party or by which it is bound.

         D. Except as modified by the Amendment, the Agreement remains unchanged
         and in full force and effect.
<PAGE>

IN WITNESS WHEREOF, the Borrower and the Bank have executed this Amendment as of
the date first written above.

A.S.V., Inc.                                NORWEST BANK MINNESOTA NORTH,
                                            NATIONAL ASSOCIATION
By:/s/ Thomas R. Karges                     By: /s/ Gerald K. Johnson
  ----------------------------------            --------------------------------
Its CFO                                     Its Vice President<PAGE>

                                                                    Exhibit 10.3

     Agreement dated as of December 31, 1993, between Medi-Ject Corporation,
1840 Berkshire Lane, Minneapolis, Minnesota, USA 55441 ("Medi-Ject"), and
Ferring N.V., Pietermaai 15, Willemstad, Curacao, Netherlands Antilles
("Ferring").

     Medi-Ject is the owner of rights with respect to a needle-free device for
subcutaneous administration of pharmaceutical drugs, the specifications for
which are attached as Schedule A. Ferring wishes to have Medi-Ject further
develop such device for the administration of recombinant human growth hormone
("hGH") in accordance with the specifications attached as Schedule B and, in
connection therewith, to have exclusive rights with respect to the use and sale
of such modified device in the Territory (as hereafter defined) for the
administration of hGH.

The parties agree as follows:

1)   Definitions. As used in this Agreement, the following definitions will
     -----------
     apply:

     (a)  "Affiliate: means any person or entity that directly, or indirectly
through one or more intermediaries, controls, or is controlled by, or is under
common control with, another person or entity.

     (b)  "Health Regulatory Agencies" means health regulatory agencies in the
various countries in the Territory and the United States Food and Drug
Administration.

     (c)  "Product" means a device for subcutaneous administration of hGH
meeting the specifications set forth in Schedules A and B with such
modifications as may result from the development work to be carried out by Medi-
Ject pursuant to Section 2 hereof and as submitted to and approved by Health
Regulatory Agencies, and including any improvements thereon hereafter made by
Medi-Ject or with respect to which Medi-Ject obtains rights.

                                       1
<PAGE>

     (d)  "Regulatory Filings" means those registrations, applications and other
filings with Health Regulatory Agencies by Medi-Ject or its Affiliates, or by
Ferring or its Affiliates, now or hereafter existing during the term of this
Agreement relating to the Product.

     (e)  "Technology" means any proprietary information, including, without
limitation, all techniques, processes, know-how, methods of analysis,
formulations and any other information now or hereafter owned by Medi-Ject or
its Affiliates, or in the possession of Medi-Ject or its Affiliates and with
respect to which they have the right to license, which relate to the Product.

     (f)  "Territory" means each and every country of Europe, now existing or
hereafter created, and each and every country which was once a part of the
U.S.S.R.

2.   Development Stage.
     -----------------

     (a)  In consideration of the payments by Ferring pursuant to Section 2 (b)
, Medi-Ject will use its best efforts diligently to develop the Product to meet
the specifications set forth in Schedule B with a target completion date on or
before July 1, 1994. During such development stage, Medi-Ject will provide
Ferring with needle-free administration devices for the purpose of laboratory
tests and pre-clinical trials. Ferring will provide Medi-Ject with the results
of such tests and trials, which Medi-Ject may use as part of a Drug Master File
in device applications with Health Regulatory Agencies.

     (b)  Attached as Schedule C is a description of milestones for the
development stage as well as performance criteria for the various milestones. In
full consideration of the development work to be performed hereunder by Medi-
Ject, Ferring will pay the following amounts:

          (i)  $50,000 upon execution of this Agreement, receipt of which is
acknowledged, which amount will be non-refundable;

                                       2
<PAGE>

          (ii)   $50,000 upon successful completion of Stage 3 as set forth in
Schedule C or May 1, 1994, whichever is earlier, which amount will be non-
refundable;

          (iii)  $50,000 upon successful completion of either Stage 4 or 5 as
set forth in Schedule C, or if this has not occurred by December 31, 1994,
$25,000 on December 31, 1994 and $25,000 upon such successful completion or June
30, 1995, whichever is earlier, which amounts will be non-refundable; and

          (iv)   with respect to each of the following countries, the amount set
forth opposite the name of the country upon the receipt of all technical and
other regulatory approvals required in that country for the commercial
introduction of the Product for the administration of hGH:

                 (A)    France      $10,000
                 (B)    Germany     $10,000
                 (C)    Italy       $15,000
                 (D)    Spain       $15,000

     If such approvals have not been received in France by January 31, 1995, in
Germany by January 31, 1996 or in Italy or Spain by July 31, 1996, then one-half
of the amount listed above shall be paid on the applicable respective date and
the balance shall be paid upon receipt of approval or December 1, 1996,
whichever is earlier. Such amounts will be non-refundable.

     (c)  At any time prior to the receipt of all technical and other regulatory
approvals referred to in Section 2(b)(iv) in one of the four countries listed in
that Section, Ferring may, upon written notice to Medi-Ject terminate this
Agreement, in which event neither party will have any further obligation to the
other except with respect to Section 11 hereof, which obligation will survive
the termination.

3.   Grant of Rights.
     ----------------

                                       3
<PAGE>

     (a)  Medi-Ject grants to Ferring the exclusive rights in the Territory with
respect to the Product and the Technology to use and market, but not
manufacture, the Product for the administration of hGH, as well as the exclusive
rights to cross-reference all Regulatory Filings relating to such use of the
Product. Medi-Ject agrees to notify Health Regulatory Agencies of Ferring's
right to cross-reference and to file all necessary documents required to allow
Ferring to exercise such right.

     (b)  Medi-Ject will communicate and deliver to Ferring all of the
information, data and know-how relating to the Technology presently under Medi-
Ject's control or that may come under the control of Medi-Ject hereafter during
the term of this Agreement.

     (c)  Medi-Ject will provide such technical assistance as may be reasonably
requested by Ferring and shall cooperate with Ferring's efforts to obtain the
necessary information, and to develop the necessary experience, to permit
Ferring to utilize effectively the Technology and to obtain from Health
Regulatory Agencies the necessary registrations to market the Product. Any
reasonable out-of-pocket expenses incurred by Medi-Ject in providing such
assistance or cooperation will be reimbursed by Ferring.

4.   Supplies.
     ---------

     (a)  Requirements.  Subject to the terms and conditions hereof, and
          ------------
following successful development of the Product, Medi-Ject will sell to Ferring,
on an exclusive basis, for subcutaneous administration of hGH all of Ferring's
requirements of the Product in the Territory.

     (b)  Forecasts.   At least 120 days prior to the first requested shipment
          ---------
date to Ferring and at six month intervals thereafter, Ferring will provide
Medi-Ject with a forecast of its purchase requirements for the Product for the
succeeding twelve months. Such forecasts will not be legally binding on Ferring
but will be prepared in good faith and will represent Ferring's reasonable
expectation of its purchase requirements for the forecasted year and Ferring
will attempt, in good faith, to purchase the volume of the Product projected by
such forecasts, it being understood,

                                       4
<PAGE>

however, that there will be no minimum purchase obligation hereunder. The
forecasts will be broken down on a quarterly basis and Medi-Ject will maintain
an inventory sufficient to cover the forecasted requirements of Ferring for two
quarterly periods.

     (c)  Maintenance of Supply.  If at any time Medi-Ject does not satisfy the
          ---------------------
requirements of the last sentence of Section 4 (b) , it shall immediately advise
Ferring. If Medi-Ject is unable to cure the deficiency within ninety days
following such advice, Medi-Ject shall immediately arrange for Ferring to
receive the Product from an alternative source which shall be able to maintain
an inventory of the Product sufficient to satisfy Ferring's requirements for a
six month period as required pursuant to Section 4 (b). At such time as the
inventory of the Product of Medi-Ject and of any alternative source arranged for
by Medi-Ject aggregates less than the equivalent of Ferring's requirements of
the Product for a period of three months, Ferring shall have the right to obtain
an alternative source of its choice. In such event, Medi-Ject agrees to give
Ferring such technical assistance on a confidential basis as is necessary to
permit Ferring to obtain the benefits of this Section 4 (c), and shall
reimburse Ferring for all reasonable expenses incurred by it in arranging for an
alternative supply source including, without limitation, expenses incurred with
respect to required regulatory approvals. Medi-Ject shall, 'in any event, give
Ferring notice as far in advance as possible of any circumstances which have
arisen or may arise which may cause the provisions of this Section 4 (c) to
become operative. Ferring shall use reasonable efforts to terminate its purchase
obligations relating to any agreement it may enter into with an alternate
supplier selected by Ferring as promptly as possible after Medi-Ject has cured
any supply deficiency.

5.   Product Price and Payments.
     ---------------------------

     (a)  Transfer Price.  The initial transfer price per unit of the Product
          ---------------
will be $225. Prices may be modified, but in no event more often than once every
twelve months commencing one year after the initial order by Ferring for
commercial sale. Any price increase shall in no event exceed the lesser of (i)
three percent and (ii) the increase in the Producer Price Index, All
Commodities, Not Seasonally Adjusted, as reported by the U.S. Department of
Labor, Bureau of

                                       5
<PAGE>

Labor Statistics for the period from the date of this Agreement or the date of
the last increase, whichever is later.

     (b)  Payment.  Payment of invoices will be in U.S. Dollars net thirty days
          --------
after receipt of goods.

6.   Orders and Shipment.  Following the initial order by Ferring for commercial
     --------------------
sale, orders for the Product will be placed by Ferring at six month intervals.
All orders for the Product will be initiated by a purchase order sent to Medi-
Ject by Ferring, it being understood that the terms of this Agreement take
precedence over any terms contained in any purchase order. All orders within the
current forecast will be deemed accepted by Medi-Ject upon receipt. For orders
in excess of the forecast, any order not rejected by Medi-Ject within thirty
days of receipt will be deemed accepted. Accepted orders will be shipped within
ninety days after receipt or by the shipment request date set forth in the
purchase order, whichever is later.

7.   Quality of Products.
     --------------------

     (a)  Quality.  The Products sold by Medi-Ject to Ferring pursuant hereto
          -------
will meet the respective specifications therefor submitted to and approved by
the applicable Health Regulatory Agencies.

     (b)  Applicable Laws. The Products sold pursuant hereto will conform in all
          ----------------
respects to the applicable laws, regulations and approvals governing the
manufacture of the Product, and Medi-Ject will assume full responsibility in
connection therewith, provided that Medi-Ject's obligation under this Section
7(b) as to any labelling of the Product is limited to conforming to the
labelling instructions specified by Ferring to Medi-Ject.

     (c)  Manufacturing Practices.  Medi-Ject agrees that the manufacture of the
          ------------------------
Products will be in accordance with good manufacturing practices as the same are
established by applicable statutes and regulations.

                                       6
<PAGE>

     (d)  Quality Control Protocol.  Each shipment of the Products to Ferring
          ------------------------
will be accompanied by a quality control protocol certified as being in
accordance with good manufacturing practices and a certificate specifying that
the Products conform to the specifications therefor.

(e)  Non-Conforming Product. In the event that any quantity of the Products
     ------------------------
delivered to Ferring pursuant hereto fails to satisfy the requirements of this
Section or fails to meet specifications agreed in writing by the parties Ferring
may reject the same by giving notice to Medi-Ject within thirty days of
Ferring's receipt of such Products. Such notice will specify the manner in which
the Products fail to meet specifications or are otherwise defective. In the
event of any dispute as to whether any quantity of the Products sold to Ferring
fails to meet such requirements or such specifications or is otherwise
defective, such dispute will be resolved by an independent testing organization
acceptable to both Ferring and Medi-Ject, the costs of which will be borne by
the losing party.

8.   Use of Name and Advertising. In the event the parties subsequently agree to
     -----------------------------
a design change in the outside sleeve for the Product solely for use by Ferring,
all sales of the Product by Ferring, and all advertising related thereto, will
be under a trademark, tradename or servicemark owned or approved by Ferring, and
Medi-Ject will have no claim or right to any name, trademark, tradename,
servicemark, goodwill or other intangible value resulting from such sales or
advertising. If such change is not made, the Product will bear the name "Medi-
Jector" which is solely the property of Medi-Ject.

9.   Representations, Warranties and Covenants of Medi-Ject.  Medi-Ject
     -------------------------------------------------------
represents, warrants and covenants that:

     (a)  Corporate Power. Medi-Ject has all requisite corporate power and
          ---------------
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.

                                       7
<PAGE>

     (b)  Rights. Medi-Ject has the right to grant to Ferring the rights granted
          ------
hereunder and to sell the Product to Ferring as contemplated hereby. Medi-Ject
has not granted and will not grant any other right or license to use the
Technology or use or sell the Product in the Territory for the administration of
hGH during the term of validity of this Agreement.

     (c)  No Other Sales. Neither Medi-Ject nor any of its Affiliates will sell
          --------------
the Product or any products competitive with the Product to any other person,
firm or corporation in the Territory for the administration of hGH during the
term of validity of this Agreement, using its best endeavors to satisfy itself
that any such usage is not intended by any prospective purchaser.

     (d)  No Infringement. The sale of the Product by Medi-Ject to Ferring, or
          ---------------
the use or sale of the Product by Ferring as contemplated hereby, will not
involve, to the best knowledge of Medi-Ject, any infringement of any patent or
other rights of any other person or entity.

     (e)  Independent Contractor. Medi-Ject is not authorized to and will not
          ----------------------
incur any liability for which Ferring may become directly, indirectly or
contingently liable, nor will Medi-Ject hold itself out as having authority to
represent or act on behalf of Ferring in any capacity whatsoever, nor will the
relationship between Ferring and Medi-Ject be construed as a co-partnership,
joint verture or principal-agent relationship.

10.  Representations, Warranties and Covenants of Ferring.  Ferring represents,
     -----------------------------------------------------
warrants and covenants that:

     (a)  Corporate Power. Ferring has all requisite corporate power and
          ---------------
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.

     (b)  Regulatory Affairs. etc. Ferring will be responsible for the
          -----------------------
maintenance of product licenses for the Product and other regulatory affairs.
Medi-Ject will have no property rights with respect to any such licenses. Medi-
Ject will have the right to cross-reference Ferring's Regulatory Filings solely
for the purposes of a Drug Master File for the Product for

                                       8
<PAGE>

administration of hGH in device applications with Health Regulatory Agencies.
Ferring agrees to notify Health Regulatory Agencies of Medi-Ject's right to
cross-reference and to file all necessary documents required to allow Medi-Ject
to exercise such right.

     (c)  Independent Contractor. Ferring is not authorized to and will not
          ----------------------
incur any liability for which Medi-Ject may become directly, indirectly or
contingently liable, nor will Ferring hold itself out as having authority to
represent or act on behalf of Medi-Ject in any capacity whatsoever, nor will the
relationship between Ferring and Medi-Ject be construed as a co-partnership,
joint venture or principal-agent relationship.

11.  Confidentiality.
     ----------------

     (a)  Each of the parties agrees to hold in confidence any confidential or
proprietary information disclosed to it by the other. Each party will take such
precautions as it normally takes with its own confidential or proprietary
information to prevent the improper disclosure to an independent third party of
information disclosed to it pursuant to this Agreement. Notwithstanding the
preceding provision, the obligation of confidence with respect to information
disclosed does not include:

          (i)   information which, at the time of disclosure, is known to the
recipient, as evidenced by records of the recipient;

          (ii)  information which, at the time of disclosure, is published,
known publicly, or is otherwise in the public domain;

          (iii) information which, after disclosure, is published, becomes known
publicly or otherwise becomes part of the public domain through no fault of the
recipient;

                                       9
<PAGE>

          (iv)  information which has been or is disclosed to the recipient in
good faith by 4 third party who was not and is not under any obligation of
confidence or secrecy at the time of such disclosure; and

          (v)   information which is required to be submitted to a governmental
agency f or the purpose of obtaining product approval, provided that the
recipient will make a good faith attempt to obtain confidential treatment by
such agency.

     (b)  Upon termination of this Agreement, each party will promptly return to
the other any confidential or proprietary information disclosed to it by the
other prior to termination and agrees to keep confidential such information for
a period of five years after the effective date of such termination.

12.  Indemnification. Each party will indemnify and hold the other party
     ---------------
harmless from and against any and all claims, judgments, costs, awards, expenses
(including reasonable attorneys' fees) and liabilities of every kind arising out
of any breach by such party of its warranties and covenants or other obligations
contained herein; provided that, with respect to product liability, Medi-Ject's
liability will be limited to claims arising from its fault or negligence in
manufacturing or delivering the Product and Ferring will be liable for any other
such claims. Any party asserting a right to indemnification hereunder will
notify the other party within thirty days of receiving notice of any third party
claim, provide the other party with all available information and assistance and
afford the other party the opportunity, at such other party's expense, to defend
or settle the claim.

13.  Term and Termination.
     ---------------------

     (a)  Term. Subject to Section 2 (c) the term of this Agreement shall be for
          ----
a period of ten years from the date on which all necessary approvals and
registrations have been obtained by Ferring to permit the marketing of the
Product in France, Germany, Italy and Spain and may be extended at Ferring's
option for additional periods of two years each, provided that not later than

                                       10
<PAGE>

one year prior to the expiration date of any such period the parties will begin
discussion of any appropriate modifications for the subsequent extension term.

     (b)  Termination. Subject to Section 2 (c), this Agreement may be
          -----------
terminated immediately upon written notice of termination given by:

          (i)  the non-defaulting party in the event that the other party:

                (1)  commits a material breach or default under this Agreement
(other than the payment of money when due), which breach or default is not
remedied within 45 days after receipt of written notice thereof by the party in
breach or default;

                (2)  has made a material misrepresentation of any representation
or warranty contained herein; or

                (3)  under the laws of The Netherlands Antilles or the United
States, (A) makes an assignment for the benefit of creditors, (B) permits the
appointment of a trustee or receiver of all or a substantial part of its assets,
(C) admits in writing its inability to meet its obligations when due or commits
any other act of bankruptcy or (D) institutes voluntary proceedings in
bankruptcy or insolvency, or permits voluntary institution of such proceedings
against it;

          (ii)  Medi-Ject in the event that Ferring fails to make any payment of
money to Medi-Ject when due and such failure continues for thirty days after
receipt of written notice thereof, for purposes of this subparagraph (ii) each
payment received from Ferring being credited against its longest past due
payment obligation; or

          (iii) Ferring in the event that the use and sale of the Product by
Ferring under the circumstances contemplated hereby results in an infringement
of any patent or other proprietary right of any other person, firm or
corporation.

                                       11
<PAGE>

     (c)  Continuation of Certain Rights. Termination of this Agreement or any
          ------------------------------
of the rights granted hereunder will be without prejudice to any rights of
either party against the other that may have accrued to the date of such
termination. Upon such termination, Medi-Ject will have the option, exercisable
within twenty days of the effective date of such termination by notice thereof,
to repurchase from Ferring any unsold Product at Ferring's total cost in
connection therewith, including shipping costs, duties, taxes, and the like. If
Medi-Ject does not repurchase the unsold Product from Ferring, Ferring will
thereafter have the right to sell, for the sole purpose of subcutaneous
administration of hGH, any units of the Product then remaining unsold.

14.  Information and Improvements.
     ----------------------------

     (a)  Medi-Ject Information. If at any time during the term of this
          ---------------------
Agreement Medi-Ject has any information concerning the Product or its use,
including protocols, clinical studies, case records, statistical analyses and
other pertinent information relating thereto, or develops any improvements to
the Product, it will promptly communicate all details in respect thereof to
Ferring, which will be entitled to use the same during the term of this
Agreement.

     (b)  Ferring Information. If at any time during the term of this Agreement
          -------------------
Ferring has any information concerning the Product or its use, including
protocols, clinical studies, case records, statistical analyses and other
pertinent information relating thereto, or develops any improvements to the
Product, it will promptly communicate all details in respect thereof to
                          -----------
Medi-Ject which will be entitled to use the same.

15.  Force Majeure. Neither party hereto will be liable for damages or otherwise
     -------------
for failure to satisfy or perform any obligation or duty to be satisfied or
performed pursuant to the terms and provisions of this Agreement, if such
failure is occasioned by act of God, war, civil disorder, strikes, labor
disputes, acts or regulations of governmental agencies and authorities, or
similar circumstances beyond the control of the party hereto who has failed to
satisfy or perform. However, any such obligation or duty, although the
satisfaction or performance thereof has been

                                       12
<PAGE>

postponed pursuant to this Section, will remain in force and will be satisfied
and performed pursuant to this Agreement as soon as such satisfaction and
performance becomes legally and practicably possible.

16.  Arbitration. All disputes and controversies arising out of or relating to
     -----------
this Agreement, other than as provided in Section 7(e) hereof will be determined
by arbitration in London, England in accordance with the Rules and Regulations
of the International Chamber of Commerce by three arbitrators appointed in
accordance with such Rules and judgment on the award rendered in such
arbitration may be entered by any court having jurisdiction thereof. Any such
arbitration shall be conducted in the English language.

17.  General Provisions.
     ------------------

     (a)  Assignability. This Agreement will be binding upon and inure to the
          -------------
benefit of the parties hereto and their successors and assigns. Neither the
rights nor the obligations of Ferring and Medi-Ject hereunder may be assigned or
delegated without the prior written consent of the other party, except that
Ferring may, without consent, assign this Agreement to an Affiliate, and Ferring
may also sublicense to an Affiliate the rights granted to it pursuant to Section
3 hereof.

     (b)  Governing Law. This Agreement will be governed by and construed in
          -------------
accordance with the laws of the State of Minnesota.

     (c)  Counterparts. This Agreement may be executed simultaneously in two or
          ------------
more counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument.

     (d)  Section Headings. All section headings herein are inserted for
          ----------------
convenience only and will not modify or affect the construction or
interpretation of any provision of this Agreement.

                                       13
<PAGE>

     (e)  Amendment. This Agreement may be modified, amended and supplemented by
          ---------
mutual written agreement of the parties. Each party may waive any condition
intended to be for its benefit. Each amendment, modification, supplement or
waiver will be in writing signed by the party to be charged.

     (f)  Entire Agreement. This Agreement contains the entire agreement of the
          ----------------
parties regarding the subject matter contained herein. All prior agreements,
negotiations and discussions between the parties which are not reflected or set
forth in this Agreement are merged into this Agreement and have no force or
effect.

     (g)  Severability. In case any one or more of the provisions of this
          ------------
Agreement should be invalid, illegal or unenforceable in any respect, the
validity, legality and enforceability of the remaining provisions will not in
any way be affected or impaired thereby.

     (h)  Notices. All notices, requests, demands and other communications
          -------
hereunder will be addressed to the addresses set forth at the head of this
Agreement and deemed to have been duly given upon receipt when delivered
personally, mailed by registered mail, return receipt requested, or telexed or
telefaxed with confirmed answer back or to such other -address designated in
accordance with the foregoing.

       IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first written above.

                                             Medi-Ject Corporation

                                             By____________________________

                                             Ferring N.V.

                                             By____________________________

                                       14
<PAGE>

                                  SCHEDULE A

                            Product Specifications
                            ----------------------

Medi-Ject has provided to Ferring technical drawings for the Medi-Jector EZ,
copies of which are attached.

This model is currently under modification; the modified device is presently
as the MJ6. Medi-Ject will, prior to March 31, 1994, provide Ferring, subject to
Ferring's approval, comparable technical drawings for the MJ6, which drawings
will then constitute Schedule A of this Agreement.

                                       15
<PAGE>

                                  SCHEDULE B

                            Ferring Specifications
                            ----------------------

Dose reading in International Units (IU) of hGH. The number scale will reflect
0.5 IU up to a total of 5.0 IU increasing in 0.5 unit increments. Total volume
capacity will remain 0.50 ml.

Size of numbers in the dosage window will be increased at least fifteen percent.

Pictograms for dose reading, power setting and locked/unlocked function will be
provided.

Any other modifications requested by Ferring will be agreed in writing by the
parties. Ferring will pay all agreed costs for such modifications.

                                       16
<PAGE>

                                  SCHEDULE C

                                  Milestones
                                  ----------

Stage 1:       Successful completion of an investigation regarding
               the formation of antibodies:
               ---------------------------

In a clinical setting, patients should be treated with jet injected growth
hormone for several months and the anti-GH antibody tiers determined. Sufficient
patients (30-50) should be treated with 6-7 administrations per week for at
least 3 months (the shortest time antibody formation can be expected and
successfully determined). Antibody formation is defined as 15% or more binding
of the administered growth hormone to antibodies, corrected for the value at the
start of the study.

Stage 2:       Successful completion of an investigation regarding
               local tolerance:
               ---------------

Normally this test is performed in rabbits.  Since this is impossible to perform
with the Medi-Jector, human data should be collected.  These should come from 2
sources; in the antibody study the local injection site should be inspected and
no reaction of the skin may occur. The other source is comparable data,
generated by Medi-Ject with jet injected insulin.

Stage 3:       Successful completion of an investigation regarding
               the effects of high pressure on hGH integrity:
               ---------------------------------------------

In a laboratory experiment the Medi-Jector loaded with reconstituted GH solution
should be emptied in a suitable receptacle. The integrity of the collected GH,
with regard to dimer, polymer, oxidized and diamidated forms, should be
determined. This should be identical to those of the freshly reconstituted
solution or at least fall within the limits as set for the final product.

                                       17
<PAGE>

Stage 4:       Successful completion of an investigation studying
               the bioequivalence of hGH by a s.c. injection as
                   ---------------
               compared to the administration with the product.

Bioequivalence should be proven between Medi-Ject injected and needle injected
growth hormone. The study should be performed double blind, cross-over in 12-18
healthy volunteers as stated in the guidelines issued by the EC.

Stage 5:       Successful completion of a clinical efficacy study.
                                                   ---------------

This multicentre study should show the clinical efficacy of hGH delivered with
the product in at least 100 patients with growth retardation due to growth
hormone deficiency over a treatment period of at least 6 months.

Stage 6:       Receipt of all technical and other regulatory
               approvals in France, Germany, Italy and Spain.

                                       18
<PAGE>

     Amendment dated as of October 26, 1994 to Agreement dated as of December
31, 1993 between Medi-Ject Corporation ("Medi-Ject") and Ferring NV ("Ferring")
(the "Agreement").

     Medi-Ject is developing the Product (as defined in the Agreement) to meet
the specifications set forth in Schedules A and B of the Agreement. The parties
wish to provide for the development of additional modifications and to expand
the Territory covered by the Agreement.

     The parties agree as follows:

     1)   Section 1 (c) of the Agreement is amended to read as follows:

          "(c) 'Product' means a device for subcutaneous administration of hGH
meeting the specifications set forth in Schedules A and B hereof and Exhibit A
to the Amendment dated as of October 26, 1994, with such modifications as may
result from the development work to be carried out by Medi-Ject pursuant to
Section 2 hereof and pursuant to paragraph 2 of the Amendment dated as of
October 26, 1994, and as submitted to and approved by Health Regulatory
Agencies, and including any improvements thereon hereafter made by Medi-Ject or
with respect to which Medi-Ject obtains rights."

     2)   In consideration of the payment by Ferring to Medi-Ject of $150, 000
upon execution of this Amendment, receipt of which is acknowledged, Medi-Ject
will use its best efforts diligently to develop the Product to meet the
specifications set forth in Exhibit A hereto with a target completion date for a
prototype model on or before October 24, 1995 and for a final production model
on or before July 24, 1996. All costs in excess of $150,000, including for
production molds and tooling, will be borne by Medi-Ject.

     3)   The second sentence of Section 2(a) of the Agreement is amended to
read as follows:

                                       19
<PAGE>

          "During such development stage and the additional development under
paragraph 2 of the Amendment dated as of October 26, 1994, Medi-Ject will
provide Ferring with needle-free administration devices for the purpose of
laboratory tests and pre-clinical trials."

     4)   Section 1(f) of the Agreement is amended to read as follows:

          "(f) 'Territory' means each and every country of the world other than
the United States, Canada, Japan and Korea; provided, however, that Medi-Ject
will afford Ferring a first right of refusal with respect to Korea before
granting to any third party the rights in such country with respect to the
Product and the Technology to use and market the Product f or the administration
of hGH."

     5)   In consideration of the amendment referred to in paragraph 4 hereof,
Ferring is paying to Medi-Ject $50,000 upon execution of this Amendment, receipt
of which is acknowledged. Subject to the last sentence of this paragraph,
Ferring will use its best efforts to obtain regulatory approvals for the Product
and to commercialize the Product after obtaining such regulatory approvals in
the countries in the Territory. Ferring will pay to Medi-Ject $40,000 upon the
first commercial sale of the Product in each country not included in the
definition of the Territory as originally defined in the Agreement (the "New
Countries") (such payment is herein referred to as a "Commercialization
Licensing Fee"). Upon Ferring paying to Medi-Ject five such Commercialization
Licensing Fees, a cumulative amount of $200,000, no further Commercialization
Licensing Fee shall be payable. If, after one year following the completion date
f or the final production model f or the Product, commercial introduction of the
Product has not taken place in. at least five New Countries, Ferring will pay to
Medi-Ject the amount of $100,000 less the sum of any payments previously made
pursuant to the preceding provisions of this paragraph 5, and the balance with
respect to such number of New Countries less than five in which commercial
introduction has not taken place will be paid on commercial introduction. Any
payment pursuant to the preceding sentence will be applied pro rata to the
number of New Countries less than five for which no payment had previously been
made during the one-year period. If, however, prior to the end of one year
following the completion date for the final

                                       20
<PAGE>

production model for the Product, there have occurred significant changes in the
market for hGH such that commercial introduction of the Product is not, in the
reasonable judgment of Ferring, commercially viable, Ferring may, without
further payment of any Commercialization Licensing terminate its rights with
respect to the New Countries.

     6)   In all other respects the Agreement shall remain in full force and
effect.

                                             Medi-Ject Corporation

                                             By____________________________

                                             Ferring NV

                                             By____________________________

                                       21
<PAGE>

                                   EXHIBIT A
                                   ---------

          SPECIFICATIONS FOR A "POWER SETTING" READING IN THE FERRING
                          SPECIFIC MEDI-JECTOR MJ6-F

Functional specification
------------------------

The power setting reading should allow, through mechanical or electronic means,
reading of the set power of penetration, in a window or comparable device, on
the outside of the Medi-Jector.

Setting the power - Power settings will cover the range of power settings
currently in the Medi-Jector device with discrete power setting stepped readout
or a continuum of adjust ability with not less than 5 discrete steps as a
readout.

Specification of design
-----------------------

The power setting readout should be in a window, comparable to that for dose
readout, and adjacent to the existing readout or as a LCD window that
incorporates both dosage and power as unique and separate readouts.

A mechanical readout of the power setting is desired for regulatory reasons if
feasible within the existing or modified housing of the device. However, either
an electrical or a mechanical solution is acceptable.

The design of the MJ-6F will be compatible and consistent with the targeted
patient population of children from six (6) to eighteen (18) years of age. It is
understood that the current Medi-Jector EZ device is considered consistent with
the targeted patient population.

                                       22
<PAGE>

     Amendment dated as of June 30, 1997 to Agreement dated as of December 31,
1993, as amended, between Medi-Ject Corporation ("Medi-Ject") and Ferring GmbH
("Ferring") (as successor in interest) (the "Agreement").

     The parties agree that the Agreement is amended as follows:

     1.   Section 1 (c) of the Agreement is amended to read as follows:

          "(c) 'Product' means a device for subcutaneous administration of hGH
meeting the specifications for the components thereof set forth in Exhibits A
(MJ6-B or Zomajet 2), B (needle-free syringe for the device described in Exhibit
A), C (adapter for the device described in Exhibit A) and D (adapter cap for the
device described in Exhibit A) to the Amendment dated as of June 30, 1997, with
such modifications as may result from the development work to be carried out by
Medi-Ject pursuant to Section 2 hereof, and as submitted to and approved by
Health Regulatory Agencies, and including any improvements thereon hereafter
made by Medi-Ject or with respect to which Medi-Ject obtains rights, excluding
any such improvements which result in a device materially smaller than the
device described in Exhibits A and B. Until first delivery of the Product as
defined in the preceding sentence to Ferring, expected January 1, 1998, the
Product shall meet the specifications set forth in Schedules A and B (MJ4) to
the Agreement as initially executed as of December 31, 1993."

     2.   Section 2(a) of the Agreement is amended to read as follows:

          "(a) Medi-Ject will use its best efforts diligently to develop the
Product to meet the specifications set forth in Exhibits A, B C and D to the
Amendment dated as of June 30, 1997 with a target completion date on or before
January 1, 1998. Medi-Ject will provide Ferring with such number of needle-free
administration devices as the parties may reasonably agree for the
purpose of laboratory tests and

                                       23
<PAGE>

pre-clinical trials. Ferring will provide Medi-Ject with the results of such
tests and trials, which Medi-Ject may use as part of a Drug Master File in
device applications with Health Regulatory Agencies."

     3.   Section 5(a) of the Agreement is amended by deleting the first
sentence and inserting in lieu thereof the following:

          "(a)  Effective July 1, 1997, the transfer price per unit of the
Product as defined in the second sentence of Section 1(c) will be $230.40.

          The initial transfer price per unit for each component of the Product
as defined in the first sentence of Section 1(c) will be $230.40 for the Zomajet
2, $2.00 for the needle-free syringe, and $1.40 for the adapter and $.25 for the
adapter cap, with the adapter and adapter cap packaged sterile together in a one
to one ratio."

     4.   Section 5(b) of the Agreement is amended to read as follows:

          "(b)  Payment. Payment of invoices will be in U.S. Dollars net thirty
                -------
days after receipt of goods meeting the applicable specifications."

     5.   Section 7 of the Agreement is amended by adding a new subsection (f)
to read as follows:

          "(f)  Warranty. Notwithstanding anything to the contrary contained
                --------
Medi-Ject warrants that for a period of one year from the date a Product is
delivered to the end user thereof (but, with respect to any Product delivered to
Ferring after June 30, 1997, in no event more than two years from the date of
delivery to Ferring) such Product shall be free from defects in material and
workmanship. Medi-Ject will replace any defective Product free of charge."

                                       24
<PAGE>

     6.   The Agreement is amended by adding a new Section 8A to read as
follows:

          "SA. Adapter Molds. Ferring has paid Medi-Ject for expenses related to
               -------------
the production of cavity molds for the manufacture of adapters and adapter caps
meeting the specifications set forth in Exhibits C and D to the Amendment dated
as of June 30, 1997, which molds shall be the property of Ferring (subject to
Medi-Ject's rights under the following two sentences) but shall remain in the
control of Medi-Ject. Medi-Ject shall retain the right to use adapters and
adapter caps produced from such molds for research and development purposes.
Medi-Ject shall also have the right to sell adapters and adapter caps produced
from such molds to third parties for resale or use with drugs other than human
growth hormone drugs with Medi-Ject needle-free drug delivery systems other than
the Product; provided that Medi-Ject shall pay to Ferring a fee of $.10 per unit
sold to third parties on all sales in excess of 100,000 units. Such fees shall
be paid by Medi-Ject within 45 days after the end of the semi-annual period to
which such fees apply accompanied by a report showing the amount and calculation
of the fees."

     7.   If in any country of the Territory in which Ferring is not marketing
recombinant human growth hormone, Medi-Ject has the opportunity to sell the
Product to a third party for the administration of human growth hormone, the
parties will in good faith discuss appropriate terms under which Medi-Ject may
market the Product in such country.

     In all other respects, the Agreement shall remain in full force and effect.

                                             Medi-Ject Corporation

                                             By: ______________________

                                             Ferring GmbH

                                             By: ______________________

                                       25
<PAGE>

                                   EXHIBIT A
                                   ---------

         SPECIFICATIONS FOR A MEDI-JECTOR 6B (or Zomajet 2) POWER PACK

Functional specification, power pack
------------------------------------

The power pack will be cylindrically shaped with no exposed external metal body
housing components at either the fully compressed or at the fully unwound spring
setting. The cylindrical portion of the power pack proximal to the connection
point for the disposable front end chamber (DFEC) will at the dosage window be
approximately 1. 15 inches along its smallest diameter and approximately 1.20
inches at its biggest diameter. These diameters represent approximate
measurements close to the dosage label display window and indicate a slight
deformation of the cylindrical shape by increasing the diameter in one
orientation to accommodate the lens. The device will accept a plastic disposable
front end chamber that will connect to the power pack via a bayonet connection
requiring less than 90(degrees) of rotation.

Power settings will cover the range of power settings currently in the Medi-
Jector device with discrete power setting stepped readout or a continuum of
adjustability with not less than five (5) discrete steps as a readout.

Design specification, power pack
--------------------------------

The dosage display will be mechanical and will require the viewing of a dosage
label through a lens. The display will be at least equal to the MJ4 dosage
display in terms of the size of the numbers displayed. The power setting, if
adjusted, will change the dosage displayed, and this may happen without changing
the actual dosage that the device will deliver.

The design of the device will be compatible and consistent with targeted patient
population of children from six (6) to eighteen (18) years of age. It is
understood that the current MJ4 device

                                       26
<PAGE>

(Medi-Jector EZ device) is consistent with this specification and a similar
device would be also consistent with this intended use and patient population.

Attached part drawing is for reference only and subsequent revision level
changes to such drawing will not invalidate contract or reference to such part
drawing.

                                       27
<PAGE>

                                   EXHIBIT B
                                   ---------

            SPECIFICATIONS OF DISPOSABLE FRONT END CHAMBER ("DFEC")
                       FOR MEDI-JECTOR 6B (or Zomajet 2)

Functional specification, disposable front end chamber (DFEC)
-------------------------------------------------------------

The disposable front end chamber (DFEC) will consist of three parts: the
injector tip, the plunger and the seal. The injector tip and plunger will be
made of polycarbonate plastic resin and the seal will be made of nitrile rubber.
The DFEC will serve as the means with which the power pack holds drug to be
injected. The DFEC is the part of the needle-free injection system which comes
in contact with the injection site. The DFEC assembly will be singly packaged
and provided sterile and pyrogen free. The DFEC will be used for seven (7)
injections or one week, whichever comes first. The components of the DFEC
include the injector tip, the plunger and the seal, which will each be
biocompatible as appropriate for a transient contact, blood path indirect,
medical device. The DFEC will be compatible with recombinant human growth
hormone, The materials used for the components and packaging of the DFEC will be
compatible with the sterilization method chosen for the assembly.

Design specification, disposable front end chamber (DFEC)
---------------------------------------------------------

The disposable front end chamber (DFEC) will be designed such that it can
connect to the Medi-Jector 6B (Zomajet2) power pack. The DFEC will allow
approximately 1/3 of a total dose to be visible to the user. In general, the
DFEC will be cylindrical in form, with pronounced variations in diameter to
accommodate a means for adapter connection and positioning as well as
positioning on the power pack. The adapter connection with the DFEC will be via
a rotational motion.

The design of the DFEC will be compatible and consistent with targeted patient
population of children from six (6) to eighteen (18) years of age. It is
understood that the current MJ4 device

                                       28
<PAGE>

(Medi-Jector EZ device) front end chamber is consistent with this specification
and a similar disposable system would be also consistent with this intended use
and patient population.

Attached part drawing is for reference only and subsequent revision level
changes to such drawing will not invalidate contract or reference to such part
drawing.

                                       29
<PAGE>

                                   EXHIBIT C
                                   ---------

          SPECIFICATIONS OF ADAPTER FOR MEDI-JECTOR 6B (or Zomajet 2)

Functional specification, adapter
---------------------------------

One end of the adapter is intended to connect with the drug vial will have a
hollow spike. The opposite end of the adapter will connect to the DFEC to serve
as a connection to facilitate the aspiration of human growth hormone from a vial
(or bottle) into the DFEC. The adapter components will be made of polycarbonate
plastic resin and elastomeric silicone. The adapter will be singly packaged and
provided sterile and pyrogen free. The adapter components will be compatible
with human growth hormone under the usage conditions currently in practice with
the MJ4 adapter. The materials used for the components and the packaging of the
adapter will be compatible with the sterilization method chosen for this
assembly.

Design specification, adapter
-----------------------------

The adapter will be cylindrical in shape and will connect to a drug vial with a
20-mm finish. The sides of the adapter will shroud a spike that is intended to
penetrate the drug vial, and this spike will allow the aspiration of drug out of
the drug vial. The adapter portion that is designed to connect with the DFEC
shall create a liquid path allowing the aspiration of drug into the DFEC.

The design of the adapter will be compatible and consistent with targeted
patient population of children from six (6) to eighteen (18) years of age. It is
understood that the current MJ4 device (Medi-Jector EZ device) has an adapter
that is consistent with this specification and a similar assembly would be also
consistent with this intended use and patient population.

Attached part drawing is for reference only and subsequent revision level
changes to such drawing will not invalidate contract or reference to such part
drawing.

                                       30
<PAGE>

                                   EXHIBIT D
                                   ---------

        SPECIFICATIONS OF ADAPTER CAP FOR MEDI-JECTOR 6B (or Zomajet 2)

Functional specification, adapter cat)
--------------------------------------

The adapter cap will connect to the adapter, opposite to the adapter/vial
connection and it will serve as a closure to prevent access to the drug and
vial. The adapter cap will be made of polycarbonate plastic resin. The adapter
cap will be singly packaged and provided sterile and pyrogen free. The adapter
components will be compatible with human growth hormone under the usage or
packaging conditions in practice during 1997 with the MJ4 adapter assembly. The
materials used for the components and the packaging of the adapter assembly will
be compatible with the sterilization method chosen for this assembly.

Design specification, adapter cap
---------------------------------

The adapter cap will be cylindrical in shape and will connect to the adapter end
that is designed to connect with the DFEC. The connection is intended to prevent
any liquid from expelling from the adapter when it is connected to a vial (or
bottle) of human growth hormone under normal storage conditions.

The design of the adapter cap will be compatible and consistent with targeted
patient population of children from six (6) to eighteen (18) years of age. It is
understood that the current MJ4 device (Medi-Jector EZ device) has an adapter
cap that is consistent with this specification and a similar assembly would be
also consistent with this intended use and patient population.

Attached part drawing is for reference only and subsequent revision level
changes to such drawing will not invalidate contract or reference to such part
drawing.

                                       31
<PAGE>

     Amendment dated as of August 15, 1998 to Agreement dated as of December 31,
1993, 29 amended, between Medi-Ject Corporation ("Medi-Ject) and Ferring GmbH
("Ferring") (the "Agreement).

     The parties agree that the Agreement is amended as follows:

     1.   Section I (f) of the Agreement is amended to read as follows:

          "(f) "Territory" means each and every country of Europe now existing
or hereafter created, and each and every country which was once port of the
USSR."

     2.   Section 5 of the Amendment dated as of October 26, 199A to the
Agreement is deleted in its entirety.

     3.   In consideration of the foregoing amendments, Medi-Ject is paying to
Ferring $75,000 upon execution of this Amendment As additional consideration
Medi-Ject agrees to pay to Ferring a fee equal to 10% of Medi-Ject's Net Sales
of the Product in countries outside of the Territory, other than the United
States, Canada, Japan and Korea, until Ferring has received an aggregate amount
of $75,000. "Net Sales" means the gross amount invoiced on sales of the Product
less returns. sales taxes and cash and trade discounts. Such fees shall be paid
by Medi-Ject within 45 days after the and of the quarterly annual period to
which such fees apply accompanied by a report showing a calculation of the
amount and fees. Medi-Ject will afford access to Ferring and its
representatives, not more often than once in any calendar year, upon reasonable
notice, to the books and records of Medi-Ject as they relate to Net Sales solely
for the purpose of verifying the correctness of such information.

     4.   Medi-Ject acknowledges that Ferring has provided to it certain highly
confidential technical information relating to Ferring's application of the
Product for the administration of human growth hormone, which information,
subject to the provisions of Section 11 of the Agreement, may be useful to Medi-
Ject in registering the Product with Health Regulatory Agencies in countries
outside of the Territory or for related purposes. Medi-Ject will give Ferring
written notice prior to using any such information for such purposes and will
cooperate with Ferring in devising procedures to maintain strict confidential
treatment of such information.

In all other respect the Agreement shall remain in full force and effect.

                                        Medi-Ject Corporation

                                        By_____________________________

                                        Ferring GmbH

                                        By_____________________________

                                       32
<PAGE>

Agreement, may be useful to Medi-Ject in registering the Product with Health
Regulatory Agencies in countries outside of the Territory or for related
purposes. Medi-Ject will give Ferring written notice prior to using any such
information for such purposes and will cooperate with Ferring in devising
procedures to maintain strict confidential treatment of such information.

In all other respect the Agreement shall remain in full force and effect.

                                        Medi-Ject Corporation

                                        By_____________________________

                                        Ferring GmbH

                                        By_____________________________

                                       33

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