OPTICAL SENSORS INC
8-K, 1998-02-05
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

                              __________________

                                   FORM 8-K
                                CURRENT REPORT

    Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

                              __________________

               Date of Report (Date of earliest event reported):
                                January 7, 1998

                              ___________________

                         OPTICAL SENSORS INCORPORATED

            (Exact name of registrant as specified in its charter)

              Delaware                0-27600               41-164359
 (State or other of Incorporation)    (Commission       (I.R.S. Employer
                                      File Number)      Identification No.)


7615 Golden Triangle Drive, Suite A, Minneapolis, Minnesota           55344-3733
(Address of principal executive offices)                              (Zip Code)


                                 (612) 944-5857
               (Company's telephone number, including area code)


                                Not applicable.
         (Former name or former address, if changed since last report)
<PAGE>
 
Item 5.  Other Events.
         ------------ 

On January 7, 1998, Optical Sensors Incorporated, a Delaware corporation (the
"Company") and Instrumentation Laboratory Company, a Delaware corporation
("IL"), entered into a Private Label Reseller Agreement for worldwide
distribution of the Company's SensiCath(R) Sensors and OpticalCAM(TM)
instrumentation (the "Reseller Agreement").  Also on January 7, 1998 and in
connection with the Reseller Agreement, the Company and Grupo CH Werfen, S.A., a
company organized under the laws of the Kingdom of Spain ("Werfen") entered into
a Stock Purchase Agreement, pursuant to which the Company agreed to sell 441,203
shares of Common Stock at a price of $5.00 per share (the "Purchase Agreement").
Werfen is the majority shareholder of IL's parent company.

Reseller Agreement
- ------------------

Pursuant to the Reseller Agreement, the Company has agreed to manufacture for
and supply to IL the Company's SensiCath Sensors, on an exclusive basis, through
December 31, 2004 and on a non-exclusive basis through December 31, 2007.  The
Company has also agreed to manufacture for and supply to IL the Company's
OpticalCAM Instruments, on a semi-exclusive basis, through December 31, 2004.
These product will be labeled and marketed under both the Company's and IL's
trademarks for sale worldwide.  The Company retains the right OpticalCAM
Instruments to manufacturers of physiological monitoring, ventilator and
anesthesia delivery systems.  IL is required to purchase sufficient quantities
of products from the Company under the Reseller Agreement that will result in
preestablished annual minimum revenues to the Company.  These quotas increase
each year during the first five years of the Reseller Agreement.  If IL fails to
meet the quota requirements, the Company has the right to convert IL's exclusive
right to a non-exclusive right.  As long as IL maintains its exclusive
distribution rights, IL may not sell any patient-attached in vitro diagnostic
blood gas monitoring system which competes directly or indirectly with the
Company's SensiCath Sensors and OpticalCAM ABG instrumentation, except for IL's
GEM 6 product line and improvements or modifications to the GEM 6 product line.
If there is a change in control of the Company, the Company will have the right
to convert the Reseller Agreement into a non-exclusive distributorship
agreement.  If the Company exercises this right, IL will have the right to
terminate the Reseller Agreement.

Purchase Agreement
- ------------------

Werfen assigned its rights under the Purchase Agreement to IL, and on January
26, 1998, IL purchased 441,203 shares (the "Shares") of the Company's Common
Stock at a price of $5.00 per share (the closing price of the Company's Common
Stock on January 6, 1998, the day prior to signing of the Purchase Agreement).
The total purchase price was $2,206,015, and the Shares represent 4.99% of the
Company's outstanding Common Stock following completion of the transaction.  The
Purchase Agreement provides IL and its affiliates with certain pre-emptive
rights to participate in future sales of equity securities by the Company, and
certain demand and incidental registration rights under a registration rights
agreement previously entered into by the Company and shareholders that purchased
shares of stock in private transactions prior to the Company's initial public
offering in February 1996.  IL is prohibited from selling or otherwise
transferring the Shares for a period of one year from the closing date of the
Purchase Agreement, except to an affiliate or pursuant to the exercise of its
registration rights.  Werfen and IL and their affiliates are 

                                       2
<PAGE>
 
also subject to certain standstill provisions for a period of five years from
the closing date that prohibit them from (a) acquiring more than 5.0% of the
Company's outstanding Common Stock, (b) entering into a voting agreement with
respect to the Shares (c) participating in any proxy solicitation or becoming a
participant in an election contest, or (d) joining a group for the purpose of
acquiring, holding, voting or disposing of shares of Common Stock.

Item 7.  Financial Statements and Exhibits.
         --------------------------------- 

     (a) Financial Statements of Businesses Acquired.

         Not Applicable

     (b) Pro Forma Financial Information.
 
         Not Applicable 

     (c) Exhibits.

<TABLE>
<CAPTION>
 Exhibit                              Description                               Method of Filing
- ---------  ------------------------------------------------------------------  ------------------
<S>        <C>                                                                 <C>
10.1       Private Label Reseller Agreement, dated as of January 7, 1998,       Filed herewith.
           between the Company and Instrumentation Laboratory Company. (1)
 
10.2       Stock Purchase Agreement, dated as of January 7, 1998, between       Filed herewith.
           the Company and Grupo CH Werfen, S.A.
 
99.1.      Press Release of the Company, dated January 7, 1998.                 Filed herewith.
 
99.2.      Press Release of the Company, dated January 15, 1998.                Filed herewith.
 
99.3       Press Release of the Company, dated January 27, 1998.                Filed herewith.
</TABLE>

(1)  Confidential treatment has been requested with respect to designated
     portions contained within document.  Such portions have been omitted and
     filed separately with the Commission pursuant to Rule 24b-2 of the
     Securities Exchange Act of 1934, as amended.

                                       3
<PAGE>
 
                                  SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Company has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                       OPTICAL SENSORS INCORPORATED


                                       By:   /s/ Sam B. Humphries
                                          -------------------------------
                                          Sam B. Humphries
                                          President and Chief Executive Officer

Dated:  February 4, 1998

                                       4
<PAGE>
 
                               INDEX TO EXHIBITS
                               -----------------
<TABLE>
<CAPTION>
 Exhibit                              Description                               Method of Filing
- ---------  ------------------------------------------------------------------  ------------------
<S>        <C>                                                                 <C>
10.1       Private Label Reseller Agreement, dated as of January 7, 1998,       Filed herewith.
           between the Company and Instrumentation Laboratory Company. (1)
 
10.2       Stock Purchase Agreement, dated as of January 7, 1998, between       Filed herewith.
           the Company and Grupo CH Werfen, S.A.
 
99.1.      Press Release of the Company, dated January 7, 1998.                 Filed herewith.
 
99.2.      Press Release of the Company, dated January 15, 1998.                Filed herewith.
 
99.3.      Press Release of the Company, dated January 27, 1998.                Filed herewith.
</TABLE>

(1)  Confidential treatment has been requested with respect to designated
     portions contained within document.  Such portions have been omitted and
     filed separately with the Commission pursuant to Rule 24b-2 of the
     Securities Exchange Act of 1934, as amended.




<PAGE>
 
                                                                    EXHIBIT 10.1

                        PRIVATE LABEL RESELLER AGREEMENT

     This Agreement (the "Agreement") is made as of January 7, 1998 (the
"Effective Date") by and between Optical Sensors Incorporated, a Delaware
corporation with a regular place of business at 7615 Golden Triangle Drive,
Technology Park Drive, Minneapolis, MN 55344 ("OSI") and Instrumentation
Laboratory Company, a Delaware corporation with a regular place of business at
101 Hartwell Avenue, Lexington, MA 02173 ("IL").

                                    RECITALS
                                    --------
                                        
     WHEREAS, OSI has developed and manufactures patient-attached arterial blood
gas ("ABG") monitoring systems including measurement instruments, interconnect
cables, sensors, and replacement parts for the measurement instruments, and

     WHEREAS, OSI is willing, in consideration of and on the terms and
conditions set forth herein, to manufacture for distribution by IL under both
IL's name and OSI's name, OSI's patient-attached ABG monitoring systems, and

     WHEREAS, IL desires to purchase from OSI and distribute OSI's patient-
attached blood gas monitoring systems to end-users, on the terms and conditions
contained in this Agreement.

     NOW THEREFORE, in consideration of the mutual covenants set forth herein,
the parties to this Agreement agree as follows:

     1.0  DEFINITIONS.

     As used in this Agreement, the following terms, and others defined
parenthetically throughout the Agreement, shall have the following respective
meanings:

     1.1  "Affiliate" of a specified party shall mean an entity that directly,
or indirectly through one or more intermediaries, controls or is controlled by,
or is under common control with, the party specified.

     1.2  "Average Selling Price" for a Product shall mean the average selling
price of such Product for a particular period, determined by dividing the
aggregate amount IL invoices non-Affiliated parties for the sales of such
Product during such period (excluding sales, use, value added or excise tax,
freight, duty or insurance included therein, discounts, and credits or
repayments due to rejection, defects or returns) by the aggregate number of
units of such Product sold during the same period.

     1.3  "Change of Control" shall mean the sale of all or substantially all of
the assets of a party, a merger of a party into another entity in which such
party does not survive, and the
<PAGE>
 
acquisition after the date of this Agreement by another entity, person, or
persons, other than a party that is an Affiliate as of the date of this
Agreement, acting together and controlling at least 50% of the outstanding
voting capital stock of such party.

     1.4  "Control" shall mean ownership of more than 50% of the shares of stock
entitled to vote for the election of directors in the case of a corporation, and
more than 50% of the voting power in the case of a business entity other than a
corporation.

     1.5  "Customer" shall mean any end-user who purchases any Product from IL.

     1.6  "Documentation" shall mean current and future versions of the user
manuals and technical specifications that describe the functional capabilities,
limitations, and operating requirements of the Products.

     1.7  "Effective Date" shall mean the date set forth in the first paragraph
of this Agreement.

     1.8  "IL's Trademarks" shall mean the trademarks owned by IL that are to be
used on and in connection with the Products, including logos used on and in
connection with the Products.

     1.9  "Instrument(s)" shall mean, in combination, OSI's OpticalCAM(TM) Blood
Measurement System, OpticalCAM(TM) Printer Package and OpticalCAM(TM) Roll
Stand,  as described in Exhibit A.

     1.10 "Target ABG Market" shall mean worldwide market potential all patients
that could benefit from at least ten (10) patient-attached blood gas
measurements during their stay in critical care units.  Estimated annual Target
ABG Market is listed in Exhibit C hereto.  The parties acknowledge and agree
that the Target ABG Market is currently 1.4 million patients throughout the
world and is anticipated to grow approximately three percent (3%) per year.

     1.11 "Product(s)" shall mean the Instruments, the Sensor, the Replacement
Parts, and other parts listed in Exhibit A either separately or in combination
and all modifications and improvements thereof that are attached to the
patients, including but not limited to modifications and improvements which
permits measurement of other physiological parameters including but not limited
to electrolytes and metabolites.

     1.12 "Proprietary Information and Technology" shall mean certain
commercially valuable, proprietary, confidential or non-public information
identified as such in writing at the time of transfer to the other party and
trade secrets with respect to each party's business and products, including
without limitation, the Products, and the designs, documentation and
specifications relating thereto.

     1.13 "Replacement Part(s)" shall mean any replacement parts for the
Instrument including a fiber optic interconnect cable that connects an ABG
module to a Sensor, and other replacement parts listed in Exhibit A.

                                       2
<PAGE>
 
     1.14 "Sensor(s)" shall mean OSI's disposable fiber optical sensor assembly
listed in Exhibit A hereto, which is attached to a patient through an arterial
pressure monitoring line and detects physiological parameters including, but not
limited to, oxygen, carbon dioxide and pH in blood.  The term "Sensors" includes
the initialization and quality assurance solutions manufactured by OSI for use
with the Sensors, other components included with the Sensors and training units,
all of which are listed in Exhibit A hereto.

     1.15 "Specifications" shall mean the technical specifications that describe
the functional capabilities, limitations, and operating requirements of the
Products.

     1.16 "Transfer Price" shall mean the price, at which OSI conveys any
Product to IL.  The Transfer Price is established in Section 6.1.

     2.0  MANUFACTURE AND PURCHASE.

     2.1  Instruments.  OSI shall manufacture for IL, and IL shall purchase from
OSI, from time to time, the Instruments from the Effective Date to December 31,
2004 at the Transfer Price established pursuant to Section 6.1.

     2.2  Sensors and Replacement Parts.  OSI shall manufacture for IL, and IL
shall purchase from OSI, from time to time, the Sensors and Replacement Parts
from the Effective Date to December 31, 2007 at the Transfer Prices established
pursuant to Section 6.1.

     2.3  Limitations on OSI.  Except as set forth in this Section 2.3, OSI
shall not, on its own or through others, manufacture for, license any technology
which would enable one to distribute or sell to any party other than IL, any
Products (under any name or designation) from the Effective Date to December 31,
2004.  OSI may sell the Instruments and Replacement Parts to the companies
listed in Exhibit B, attached hereto and made a part hereof, and other companies
in the business of manufacturing physiological monitoring, ventilator, and
anesthesia delivery systems provided that such other companies do not
manufacture or sell critical care in-vitro diagnostic systems.

     2.4  Limitations on IL.  So long as IL's rights under Section 5.1 and 5.2
are exclusive and OSI does not appoint other competitive distributors, IL shall
not sell any patient-attached in-vitro diagnostic blood gas monitoring systems
which compete directly or indirectly with any Product. Notwithstanding the
foregoing, IL shall be permitted to sell the GEM 6 product line and any
improvement or modification of the GEM 6 product line.

     2.5  Inspection of Products.  Products shall be subject to inspection by
IL.  In the event any shipment of Products by OSI to IL, or any portion thereof,
does not conform to the Purchase Order or the applicable Specifications, IL
shall notify OSI within thirty (30) days for nonconformance with the Purchase
Order and ninety (90) days for nonconformance with the Specifications of IL's
receipt of such Products in a writing which specifies how the Products are

                                       3
<PAGE>
 
nonconforming.  All shipments and all Products shall be deemed accepted by IL if
IL does not provide such written notice to OSI.  OSI shall confirm receipt of
IL's written notice within five (5) business days of receipt.  IL may, upon
receipt of OSI's confirmation which does not contain other instructions,
acceptable to IL, concerning the replacement or repair of the Products, reject
the nonconforming Products and promptly return them to OSI.  OSI agrees that in
the event a latent defect is discovered by IL or Customers, within the
applicable warranty period set forth in Section 9, the applicable provisions of
Section 9 shall apply.

     2.6  Rejected Products.  If IL rejects any Products as provided in Section
2.5 above, OSI shall provide, at IL's option, (i) a refund or credit to IL's
account for the amount paid or credit for the amount payable for such rejected
Products; or (ii) a replacement of such rejected Products.  If IL requests
replacement, OSI shall, within thirty (30) days of receipt of such written
request, ship replacements from OSI's available inventory.

     2.7  Demonstration Instruments.  OSI shall sell to IL, and IL has the right
to purchase from OSI, up to XXXXXXXX (XXXX) Instruments in combination, which
are intended for demonstration purposes, ("Demonstration Instruments") at a
price of XXXXXXXX dollars ($XXXX) per Instrument. IL shall take delivery of
XXXXXXXX (XXXX) Demonstration Instruments no later than June 30, 1998. IL has
the right to purchase an additional XXXXXXXX (XXXX) Demonstration Instruments,
at a price of XXXXXXXX dollars ($XXXX) per Demonstration Instrument, prior to
March 31, 1999. If IL desires to purchase more than a total of XXXXXXXX (XXXX)
Demonstration Instruments, IL shall pay the Transfer Price established pursuant
to Section 6.1, less XXXXXXXX (XXXX%) for each additional Demonstration
Instruments. The warranties set forth in Section 9 shall not apply to the
Demonstration Instruments.  [PORTIONS OF THIS SECTION HAVE BEEN OMITTED PURSUANT
TO A REQUEST FOR CONFIDENTIALITY UNDER RULE 24B-2 OF THE SECURITIES EXCHANGE ACT
OF 1934, AS AMENDED.  A COPY OF THIS AGREEMENT WITH THIS SECTION INTACT HAS BEEN
FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.]

     2.8  Market Launch Instruments.  OSI shall sell to, and IL shall purchase
from OSI, at a price of XXXXXXXX  dollars ($XXXX) per Instrument, such number of
Instruments as IL places at no charge to Customers that sign written agreements
to purchase Sensors, up to a maximum of XXXXXXXX  (XXXX) Instruments. IL will
use commercially reasonable efforts to place Instruments at such Customer
locations within thirty (30) days of Customer's signature of agreement to buy
Sensors. The Instruments shall be placed at those Customer locations listed in
Exhibit D and at such other Customer locations as are jointly selected by IL and
OSI.  The Instruments purchased and placed pursuant to this Section 2.8 are
intended to accelerate market penetration for Sensors, and parties expect these
Customers to purchase the Sensors at retail prices.  [PORTIONS OF THIS SECTION
HAVE BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIALITY UNDER RULE 24B-2 OF
THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.  A COPY OF THIS AGREEMENT WITH
THIS SECTION INTACT HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION.]

     2.9  Demonstration Sensors.  OSI shall sell to, and IL shall purchase from
OSI, reasonable quantities of Sensors, as IL may request from time to time,
which shall be used for 

                                       4
<PAGE>
 
demonstration purposes only ("Demonstration Sensors"). The Demonstration Sensors
shall be sold to IL at a price equal to eighty percent (80%) of the applicable
Transfer Price for Sensors set forth in Exhibit C. The Sensors purchased
pursuant to this Section 2.9 are for salesforce demonstration and customer
training purposes only and may not be resold.

     3.0  DEVELOPMENT DUTIES.

     3.1  Interface Systems.  OSI and IL shall jointly develop interface systems
for interfacing the Products with IL's physiological monitoring systems,
information management systems, or both.

     3.2  Timetable.  OSI and IL agree to develop the interface systems
described in Section 3.1 by January 1, 1999 subject to receipt of any regulatory
approvals or clearances.

     4.0  REGULATORY MATTERS

     4.1  General.  OSI shall, at its own expense, obtain and provide (1) any
information, including but not limited to information relating to clinical
investigation, required by Section 510K of the Food, Drug, and Cosmetic Act (21
USCS 360(k)) to sell Products in the United States; (2) export certificates
required for international sale of Products to IL; and (3) approvals from
certification authorities, including, without limitation, the Canadian Standards
Association National Recognized Testing Laboratory, Underwriter's Laboratory
(UL) that meet IC 1010 requirements and CE Mark.  OSI shall mark all Products,
as required by any applicable law or regulation, with all necessary regulatory
approval symbols.  OSI shall prepare and maintain technical files for the
Products as required by Medical Diagnostic Device regulations.

     4.2  Regulatory Approvals.  OSI represents and warrants to IL that it has
obtained all necessary licenses, permits and approvals of any third party,
including without limitation any administrative or regulatory body or any
governmental agency, necessary for sale of Products in U.S., Canada, Japan, and
European Community.  In addition, OSI shall use commercially reasonable efforts
to obtain country-specific regulatory approvals for such other countries in the
world as the parties may mutually agree based upon the anticipated benefits from
IL's marketing efforts in such country and OSI's anticipated time and expense in
seeking the necessary regulatory approval in such country.  OSI and IL shall
work together to establish the strategy for obtaining in the most timely and
efficient manner the regulatory approvals to be obtained pursuant to this
Section 4.2.  Except as otherwise required by law or agreed by the parties, OSI
will be responsible for all dealings with and obtaining permits, approvals or
licenses from, the appropriate administrative or regulatory body or governmental
agency, including competent authorities such as Notification, Medical Device
Vigilance and national labeling issues.  Unless prohibited by applicable law or
regulations, all regulatory approvals shall be in the name of OSI.  

                                       5
<PAGE>
 
IL shall, as soon as reasonably practicable, notify, document and forward to OSI
or OSI's authorized representative all customer complaints received by IL such
that OSI can comply with Medical Device Reporting (MDR) regulations and
vigilance.

     5.0  RIGHTS AND LICENSES.

     5.1  Sensors and Replacement Parts.  OSI hereby grants to IL, and IL hereby
accepts, an exclusive right and license to sell directly or through distributors
the Sensors and the Replacement Parts worldwide from the Effective Date to
December 31, 2004 and a non-exclusive right and license to sell directly or
through distributors the Sensors and the Replacement Parts worldwide from
January 1, 2005 to December 31, 2007.

     5.2  Instruments.  Subject to the second sentence of this Section 5.2, OSI
hereby grants to IL, and IL hereby accepts, an exclusive right and license to
sell directly or through distributors the Instruments worldwide from the
Effective Date to December 31, 2004.  OSI retains the right to enter into
agreements for distribution of the Instruments with the companies listed in
Exhibit B and other companies in the business of manufacturing physiological
monitoring, ventilator, and anesthesia delivery systems provided that such other
companies do not manufacture or sell critical care in-vitro diagnostic systems.

     5.3  Subdistributors.  IL may appoint subdistributors for the sale or
distribution of Products and will provide to OSI a list of such subdistributors
from time to time.  IL will distribute the Products through the same
distribution channels that it uses for other IL Blood Gas Point of Care
products.  IL represents that it currently maintains a direct sales force in the
United States, United Kingdom, France and Germany.  Notwithstanding such
appointment of subdistributors, IL shall remain fully responsible for the
performance of all of its covenants and obligations hereunder.  IL shall
indemnify and hold OSI harmless from and against any claim, loss, damage or
expense (including reasonable attorneys' fees) suffered or incurred by OSI
relating to any claim made against OSI regarding this Agreement by any
subdistributor or subagent appointed by IL.

     5.4  Trademarks.  OSI hereby grants to IL a non-exclusive, non-transferable
right and license to use the trademarks SensiCath(R) and OpticalCAM(TM) in
connection with the distribution of the Products as long as such trademarks are
used by IL in accordance with OSI's standards, specifications and instructions,
but in no event beyond the term of this Agreement.  IL shall not acquire any
right, title or interest under the laws of any nation in such trademarks, trade
names or logotypes of OSI other than the foregoing limited license and shall not
attempt to assert or register any such right, title or interest.  Upon
termination of IL's right to distribute the Products, IL shall cease using the
trademarks SensiCath(R) and OpticalCAM(TM).

                                       6
<PAGE>
 
     5.5  New Products.  If OSI develops any non-patient-attached version of the
Product, OSI shall notify IL promptly after OSI estimates the date that such
non-patient-attached version of the Product will be available for commercial
sale, and IL will have the right for a period of sixty (60) days after the date
of such notice to negotiate exclusively with OSI for the right to distribute
such non-patient-attached version of the Product on terms that are consistent
with this Agreement, provided that IL gives OSI written notice within thirty
(30) days after receipt of OSI's notice that IL intends to pursue such
negotiations. During such sixty (60) day period, OSI will not negotiate with or
enter into an agreement with any other party for the distribution of such non-
patient-attached version of the Product. If the parties fail to reach mutual
agreement on the terms of a definitive agreement for distribution of the non-
patient-attached version of the Product within such sixty (60) day period, then
OSI shall have the right to negotiate and enter into agreements with third
parties for the distribution of such non-patient-attached versions of the
Product.

     5.6  IL Terms and Conditions.  IL shall ensure that IL's standard terms and
conditions of sale of Products to Customers shall include terms and conditions
regarding each party's Proprietary Rights and Technology that are at least as
restrictive as those provided herein, and shall enforce such terms and
conditions.

     5.7  No Other Rights.  No party grants any license, other than as set forth
expressly herein, by implication or otherwise, under any of its copyrights,
patents, trade secrets, trademarks or tradename rights, as a result of the
disclosure of any Proprietary Information and Technology.

     6.0  PRICING AND PAYMENT.

     6.1  Transfer Prices.  The Transfer Prices for the Instruments and the
Sensors from the Effective Date through December 31, 1998 shall be the prices
for 1998 set forth in Exhibit C.  For each calendar year after 1998, the
Transfer Price of the Instruments shall be equal to OSI's direct cost of
manufacturing (i.e., direct material cost, direct labor cost and manufacturing
overhead), or having third parties manufacture, the Instruments, plus warranty
and service costs, or the Transfer Prices for the applicable year as set forth
in Exhibit C, whichever is lower.  For each calendar year after 1998, the
Transfer Price of the Sensors shall be equal to the percentage for such year on
the line designated "IL Discount %" set forth in Exhibit C multiplied by the
Average Selling Price of Sensors to Customers for the prior calendar year,
provided that IL achieved the prior calendar year sales Quotas, as described in
Section 7.2.  If IL becomes a non-exclusive distributor pursuant to Section 7.2,
the parties shall negotiate in good faith the Transfer Price of the Sensors to
IL as a non-exclusive distributor.  The Transfer Prices of all Replacement Parts
shall be equal to OSI's direct cost of manufacturing (i.e., direct material
cost, direct labor 

                                       7
<PAGE>
 
cost and manufacturing overhead), or having third parties manufacture, such
Replacement Parts, plus ten percent (10%).

     6.2  No More Favorable Terms.  OSI agrees not to sell the Products to any
reseller on financial terms more favorable than those provided for herein.

     6.3  Taxes.  Transfer Prices for all Products and replacement parts are
exclusive of all federal, state, and local excise, sales, use, value added and
similar taxes, and all export and import duties, which taxes and duties,
exclusive of taxes on the income of OSI, shall be paid by IL and if paid by OSI
shall be promptly reimbursed by IL to OSI.

     6.4  Delivery Terms.  All prices shall be F.O.B. OSI's facility, provided
the facility is located in the continental United States or, with respect to
Products that are to be shipped to IL in any European country, the facility is
located in Europe.  If Products are shipped from any other location, all prices
shall be F.O.B. destination.  IL assumes all risk of loss upon OSI's delivery of
the Products to the carrier at the F.O.B. Point and OSI shall have no further
responsibility for risk of damage to or loss or delay of Products after their
delivery at the F.O.B. Point.  All Product deliveries shall be made by a common
carrier specified by IL or, in the event that no carrier shall have been
specified by IL on or before the date fifteen (15) days prior to the requested
shipment date, a common carrier reasonably selected by OSI.  IL agrees to pay
(or reimburse OSI if OSI makes such payment), all loading, freight, shipping,
insurance, forwarding and handling charges, taxes, fees, storage, and all other
charges applicable to the Products after they are delivered by OSI at the F.O.B.
Point.

     6.5  Payment Terms.  All payments for Products shall be due thirty (30)
days after receipt of Products and receipt of invoice for such Products.
Payments shall be made in full, on or before the due date, in United States
dollars to OSI at its address as shown in the preamble to this Agreement.  All
payments which are not made when due shall accrue interest at the rate (to the
extent permitted by law) of one percent (1%) per month.

     7.0  MINIMUM PURCHASE OBLIGATIONS.

     7.1  General Obligations and Quota.  IL agrees to use commercially
reasonable efforts to promote and distribute the Products throughout the world.
To retain exclusive nature of the Agreement, IL agrees to purchase from OSI
during each calendar year a sufficient quantity of Products to achieve at least
the minimum Total OSI Minimum Revenue from sales of Products set forth in
Exhibit C hereto for such year (the "Quota").  IL and OSI may revise the Quota
pursuant to Section 7.2.  The parties acknowledge that the Quota is based on
reasonable penetration rates of the Products into the Target ABG Market. In the
event IL is unable to sell Product due to regulatory restrictions that prevent
sale of the Product in the US, Canada, Japan and the European Community, failure
of the Product to perform substantially in accordance with 

                                       8
<PAGE>
 
the Specifications or failure of OSI to supply Product in accordance with this
Agreement, then the Quota per annum shall be reduced on a pro rata basis for
each day IL is unable to sell or market the Product.

     7.2  Termination of Exclusivity.  If IL does not order at least fifty
percent (50%) of the applicable Quota during any calendar year, OSI shall be
entitled, in its sole discretion, by written notice at anytime after the end of
such year, to convert IL's exclusive distribution rights for Products under this
Agreement to a non-exclusive right as of the end of such year.  If IL achieves
more than fifty percent (50%) but less than one hundred percent (100%) of the
applicable Quota during any calendar year and does not elect to make the
Shortfall payment described below, the parties shall meet within thirty (30)
days of the end of such calendar year to evaluate the reasons for such
deficiency and to establish Quotas for the following calendar year.  If the
parties are unable to agree upon Quotas for such following calendar year, the
Quota for the first six months of such following calendar year shall be equal to
50% of the annual Quota set forth in Exhibit C for such following year.  If IL
does not order a sufficient quantity of Products to achieve at least the
applicable Quota for the first six months during the first two quarters of such
following calendar year, OSI shall be entitled, in its sole discretion, by
written notice at anytime after June 30 of such following calendar year, to
convert IL's exclusive distribution rights for Products under this Agreement to
a non-exclusive right.  If IL orders a sufficient quantity of Products to
achieve more than fifty percent (50%) of the applicable Quota but less than one
hundred percent (100%) of the applicable Quota during any calendar year, IL may
elect to cure such deficiency by either (a) issuing a purchase order for the
purchase of sufficient quantities of Products to make up the amount by which
IL's purchases for such calendar year were below the Quota (the "Shortfall") and
paying for such Products within thirty (30) days after shipment thereof, or (ii)
paying OSI cash in the amount of the Shortfall.  IL must issue a purchase order
for the Shortfall or pay OSI the amount of such Shortfall within thirty (30)
days of the end of the calendar year to which the Shortfall relates.  If IL pays
OSI cash in the amount of the Shortfall, such payment shall be treated as a
prepayment for Products to be ordered by IL in the future and shall be applied
toward the purchase price of such future Product Purchase Orders as IL directs.
Future Product purchases to which such Shortfall payment applies shall not be
counted as Product purchases for purposes of determining whether the Quota for
such future period is met.

     8.0  FORECASTS, ORDERS AND DELIVERY.

     8.1  Forecasts. IL shall provide OSI, on a monthly basis, beginning with
the first month after the first full month after execution of the Agreement, a
six (6) month rolling forecast of estimated quantities of Products it intends to
purchase pursuant to this Agreement.  IL shall provide such forecasts within the
first week of each such month. The first two (2) months of each 

                                       9
<PAGE>
 
forecast shall constitute a firm order to purchase the number of Instruments
specified in the forecast, and the first one (1) month of each forecast shall
constitute a firm order to purchase the number of Sensors specified in the
forecast. The remaining portion of each forecast shall constitute a non-binding
good faith estimate of expected orders for Products, but in any event, an actual
order for a particular period shall be within thirty percent (30%) of the
estimate provided for the particular period.

     8.2  Purchase Orders.  IL shall submit purchase orders for Products to OSI
in writing, whether by mail, facsimile, telegram or otherwise, at the time that
each forecast is delivered to OSI pursuant to Section 8.1.  Each Purchase Order
shall cover at least the portion of the forecast that becomes a firm order under
Section 8.1 and shall, at a minimum, set forth the part  numbers, quantities,
delivery dates, shipping instructions, and shipping addresses for all Products
ordered.  Each purchase order shall give rise to a contract between IL and OSI
for the sale of the Products ordered and shall be subject to and governed by the
terms of this Agreement.  Each Purchase Order shall specify a delivery date
which shall be at least ninety (90) days after the date of such Purchase Order
but which shall not be beyond the termination date of this Agreement.  The terms
and conditions of this Agreement shall take precedence over the terms and
conditions of any Purchase Order and IL agrees to be bound hereby.  No term or
condition of any IL Purchase Order or any other document or instrument of IL
shall amend or modify or supplement this Agreement.  No purchase order shall be
modified or canceled except upon the mutual agreement of the parties.  Mutually
agreed change orders shall be subject to all provisions of this Agreement,
whether or not the changed purchase order so states.

     8.3  Shipments and Compliance with Laws.  OSI agrees to ship Products to IL
pursuant to properly issued Purchase Orders hereunder.  IL hereby agrees: (a) to
assist OSI, at OSI's expense, in obtaining any licenses or permits which OSI may
require to ship Products, by supplying such documentation or information as may
be reasonably requested by OSI, (b) to comply with any decrees, statutes, rules
and regulations of the government of the United States and agencies thereof
applicable to the shipment of Products hereunder, (c) to maintain any records
necessary to comply with any such decrees, statutes, rules and regulations, (d)
not to re-export any Products except in compliance with such decrees, statutes,
rules and regulations, and (e) to obtain all governmental approvals and licenses
necessary to import the Products into any country into which Products are being
imported, and (f) not to sell, transfer, or otherwise dispose of the Products in
violation of the export laws of the United States.

     8.4  Packaging.  All Products ordered by IL shall be packaged for shipment
and storage in accordance with OSI's standard commercial practices.  IL shall
notify OSI of any special packaging requirements (which shall be made at IL's
expense and with OSI's approval).

                                       10
<PAGE>
 
     9.0  WARRANTIES AND COVENANTS OF OSI.

     9.1  Records Maintenance.  OSI shall maintain accurate and complete records
relating to the manufacture of the Products including, without limitation, all
records necessary or appropriate to ensure (a) traceability of the Products,
from manufacture to the date of shipment, in compliance with all applicable laws
and (b) that corrective actions may be made in accordance with Section 19.2
hereto.  OSI shall provide IL copies of all such records and access to all such
records, as reasonably requested by IL, subject to the provisions of Section
13.3.

     9.2  Instruments.  OSI warrants that the Instruments (except for
demonstration Instruments sold pursuant to Section 2.7) and related software
provided by OSI pursuant to this Agreement will be free from defects in design,
material, and workmanship in normal use and service for a period of three (3)
years from the date of shipment to IL by OSI.  If any Instrument or related
software covered by this warranty is returned within the warranty period to the
original shipping point, transportation prepaid, and OSI reasonably determines
that such Instrument was defective under the warranty set forth in this Section
9.2, OSI will, at OSI's option:  (a) repair or replace the Instrument or the
defective part thereof within 30 days of receipt; (b) refund or credit the
original purchase price of the Instrument to IL; or at IL's option, (c) provide
IL the parts and components necessary for IL to repair the Instruments or the
defective part.

     9.3  Sensors.  OSI warrants that the Sensors manufactured and sold by OSI
to IL pursuant to this Agreement will be free from defects in design, material,
and workmanship in normal use and service, and will conform with the
Specifications with respect to stability, for a period of two hundred (200) days
from the date of shipment to IL by OSI.  OSI will use commercially reasonable
efforts to increase the Sensor stability period to three-hundred and sixty-five
(365) days from the date of shipment to IL by OSI by December 31, 1998.  If any
Sensor covered by this warranty is returned within the warranty period to the
original shipping point, transportation prepaid, and OSI reasonably determines
that such Sensor was defective under the warranty set forth in this Section 9.3,
OSI will, at OSI's option: (a) replace the non-conforming Sensor; or (b) refund
or credit the original purchase price of the non-conforming Sensor to IL.

     9.4  Software.  If, at any time during the period ending one (1) year after
the date of shipment of any Instrument to IL, IL shall report and document any
error in any software forming a component of such Instrument which error limits
or prevents the Product from performing the functions described in the
Documentation, OSI shall, at OSI's option:  (a) use reasonable efforts to
correct any such error; (b) replace such Software at no charge to IL; (c)
provide IL with any alternative means of performing such functions; or (d)
refund or credit the original purchase price of the related Instrument to IL.
This warranty shall apply only to those portions of the software that were
developed by OSI or on its behalf and that incorporate all 

                                       11
<PAGE>
 
program corrections and modifications, if any, delivered to IL. This warranty
shall not apply to any error or failure resulting from: (i) IL's failure to
follow operating instructions; (ii) negligence, misuse, abuse or accident; or
(iii) unreasonable modifications by any person or entity other than OSI.

     9.5  Termination and/or Limitation of Warranties.  Notwithstanding the
foregoing, the warranties set forth in this Section 9 shall not cover damages to
any Product resulting from (a) natural disasters, including fire, smoke, water,
earthquakes, lightning or static electricity, (b) causes external to the Product
such as, but not limited to, electrical power fluctuations or failures, (c) the
neglect, accident, misuse (including faulty repair or maintenance by other than
OSI), improper storage of the Product or other failure to comply with the
instructions set forth in the Documentation and or manual constituting part of
the Product, (d) a modification of the Product not provided by OSI, (e) a
malfunction of any equipment not provided by OSI with which the Product is used
or combined or (f) use of the Product in a manner for which it was not designed.
The warranties set forth in this Section 9 shall not apply to (i) supplies,
accessories, or other materials which are by their nature expendable, (ii) any
services, including, without limitation, installation, alterations,
modifications, maintenance or removal of, or relating to, any item not furnished
by OSI, (iii) any services related to work external to the Product, including,
without limitation, electrical work, cable routing or changes which affect the
Product or any Product from which OSI's serial number and/or proprietary
information protection notice has been removed or defaced.  Prior to returning
any Product alleged to be defective, IL shall notify OSI in writing of the
claimed defect and shall include the model and lot/serial number of such
Product, as well as the number and date of the invoice therefor.  No Product
shall be returned without first requesting a returned goods authorization number
from OSI.

     9.6  LIMITATION OF WARRANTIES.  THE WARRANTIES SET FORTH IN SECTION 9 ARE
INTENDED SOLELY FOR THE BENEFIT OF IL.  ALL CLAIMS HEREUNDER SHALL BE MADE BY IL
AND MAY NOT BE MADE BY IL'S CUSTOMERS.  THE WARRANTIES SET FORTH ABOVE ARE IN
LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, WHICH ARE HEREBY DISCLAIMED
AND EXCLUDED BY OSI, INCLUDING WITHOUT LIMITATION ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE AND ALL OBLIGATIONS
OR LIABILITIES ON THE PART OF OSI FOR DAMAGES ARISING OUT OF OR IN CONNECTION
WITH THE USE, REPAIR OR PERFORMANCE OF THE PRODUCTS.

     9.7  Quality.  Each party will permit the other to inspect the production,
development and testing facilities relating to the Products, at mutually
convenient, reasonable times and upon reasonable notice, not more than one time
in any twelve (12) month period, in order to determine 

                                       12
<PAGE>
 
that the quality of the Products is being maintained and that each party remains
in compliance with the terms and conditions of this Agreement. Each party
acknowledges that the information obtained in each such inspection is
confidential and/or proprietary in accordance with Section 13.3.

     10.0 WARRANTIES AND COVENANTS OF IL.

     10.1 Compliance with Laws.  IL represents and warrants to OSI that it has
obtained all necessary licenses, permits and approvals of any third party,
including without limitation any administrative or regulatory body or any
governmental agency, necessary for its performance under this Agreement.

     10.2 Records Maintenance.  IL shall maintain accurate and complete records
relating to the Products, any products incorporating the Products, and the
marketing and distribution thereof from the date of shipment by OSI, including,
without limitation, all records necessary or appropriate to ensure (a)
traceability of the Products in compliance with all applicable laws and (b) that
corrective actions may be made in accordance with Section 19.  IL shall provide
OSI copies of all such records and access to all such records, as reasonably
requested by OSI.

     11.0 LIMITATION OF LIABILITY.

     11.1 EXCEPT FOR CLAIMS UNDER SECTION 12.1, IN NO EVENT SHALL EITHER PARTY
BE LIABLE TO THE OTHER PARTY FOR ANY INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES
OR LOST PROFITS ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE PERFORMANCE
OR BREACH THEREOF, EVEN IF THE PARTY HAS BEEN ADVISED OF THE POSSIBILITY
THEREOF.
 
     12.0 INFRINGEMENT MATTERS AND INDEMNITY.

     12.1 Defense and Indemnity of Intellectual Property Infringement Claims.
In the event that any claim is made by any party against IL or a Customer that
any of the Products infringes any U.S. patent, trade secret, copyright, or other
intellectual property right of any third party, OSI will defend IL, the
Customer, or both, at OSI's expense against such claim, and will pay any
settlements or judgments ultimately awarded against IL, the Customer, or both,
as a result of such claim, provided that:  (a) OSI has been notified in writing
promptly after IL has received notice of such a claim and OSI has received  a
copy of all communications received by IL in connection with such claim, (b) OSI
is allowed to exercise sole control over the defense of the claim and all
related settlement negotiations, and the incurring of any expenses relating
thereto, and (c) IL provides to OSI, at OSI's expense, all reasonably necessary
assistance, information and authority to perform the above.

                                       13
<PAGE>
 
     12.2 Limitation of Liability.  OSI shall have no liability or obligation to
IL under Section 12.1 if such claim is based upon, arises out of, or results
solely from (i) a modification of the Product not provided by OSI, (ii) any
equipment not manufactured or provided by OSI with which the Product is used or
combined, or (iii) use of the Product in a manner for which it was not designed
or intended to be used.

     12.3  Rights in the Event of Infringement Claims.  In the event that any
claim of infringement under Section 12.1 is, or in OSI's judgment is likely to
be, made or substantiated, OSI shall use commercially reasonable efforts, at its
expense and at its sole discretion, either to:  (a) obtain a license from the
third party for IL and its Customers to continue using the infringing Products,
or (b) modify the infringing Products to avoid such infringement without
materially diminishing its functional capabilities.  If, after reasonable
business efforts, the parties are unable to effect a satisfactory solution to
any such infringement claim under paragraphs (a) or (b) of this Section 12.3,
either party will have the right to terminate this Agreement.

     12.4 Defense and Indemnity of Other Claims.  In the event that any claim is
made by any party against IL or OSI arising out of or relating to any action
taken by the other party, in accordance with OSI's written instructions,
pursuant to Section 19.2, OSI will defend IL at OSI's expense against such
claim, and will pay any settlements or judgments ultimately awarded against IL
as a result of such claim, provided that:  (a) OSI has been notified in writing
promptly after IL has received notice of such a claim and OSI has received  a
copy of all communications received by IL in connection with such claim, (b) OSI
is allowed to exercise sole control over the defense of the claim and all
related settlement negotiations and the incurring of all expenses related to
such claim, and (c) IL provides to OSI, at OSI's expense, all reasonably
necessary assistance, information and authority to perform the above.

     12.5 Product Liability Claims.  OSI agrees to hold IL harmless from and
indemnify IL with respect to any and all claims, damages, and expenses of every
kind or nature whatsoever, including reasonable attorneys' fees, arising from
claims of third parties for personal injury or loss of or damage to property
relating to or arising out of any Product ("Product Liability Claim") (excluding
normal product technical support and failure notifications); provided that IL
has not made any changes, additions or modifications to the Products or any
unauthorized representations with respect to the Products.  IL shall notify OSI
in writing of any Product Liability Claim within twenty (20) days of receipt
thereof and agrees to furnish OSI with full information concerning any such
Product Liability Claim.  OSI shall have full control over the defense of any
Product Liability Claim and shall have the right, in its sole discretion, to
compromise or settle any such claim.  IL agrees to cooperate fully with OSI in
order to facilitate a settlement or defense of any Product Liability Claim.

                                       14
<PAGE>
 
     12.6 Breach of Agreement.  IL and OSI shall indemnify and hold each other
harmless from and against any claim, loss, damage or expense (including
reasonable attorneys' fees) suffered or incurred by a third party as a result of
a breach of this Agreement by the other.

     13.0 PROTECTION OF PROPRIETARY RIGHTS.

     13.1 Intellectual Property.  IL acknowledges that as between OSI and IL,
all intellectual property, excluding  IL's Trademarks, embodied by the Products
is the sole and exclusive property of OSI, and that no title or ownership of the
intellectual property embodied by the Products is transferred to IL, and that
all such intellectual property is subject to obligations of confidentiality set
forth in Section 13.3 of this Agreement.

     13.2 Markings.  IL agrees that all patent, copyright, trademark, other
proprietary notices, serial numbers, labels and other identifying symbols or
legends of OSI affixed to or displayed on the Products, Documentation or
packaging will not be removed or modified by IL; and IL will not instruct
customers to do so.  IL agrees to include all such patent, copyright and/or
trademark notices and other notices of OSI proprietary rights on any and all
copies of Products and/or Documentation.

     13.3 Confidential Information.  In addition to the other obligations of
confidence imposed under this Agreement, each party hereto agrees as follows:

          (a) To keep strictly confidential all Proprietary Information and
Technology received by it and to use such Proprietary Information and Technology
solely for the purposes of performing this Agreement;

          (b) To take commercially reasonable steps to maintain and protect all
of the other party's Proprietary Information and Technology as confidential and
not to disclose the Proprietary Information and Technology to any third party.
In no event shall a receiving party treat the Proprietary Information and
Technology of a disclosing party with any less care than that used in connection
with the receiving party's own Proprietary Information and Technology.  Each
party represents and warrants to the other party that it maintains reasonable
and customary procedures to protect the confidentiality of its own Proprietary
Information and Technology.

          (c) To use commercially reasonable efforts to ensure compliance with
this Section 13.3 by its employees, agents, and consultants having access to the
Proprietary Information and Technology and to provide such Proprietary
Information and Technology to employees, agents, or consultants only on a need
to know basis. Both parties agree that Customer Lists, pricing information and
the information contained in Exhibits B, C and D, which pertain to customer
information, pricing and marketing strategies are to be treated as confidential.

          (d) To return within three (3) days of a request, copies of any
Proprietary Information and Technology which was previously provided by the
other party.

                                       15
<PAGE>
 
          (e) A party's obligations as to the Proprietary Information and
Technology shall not apply to any portion of the Proprietary Information and
Technology that:  (i) a party's written records show it presently had knowledge
of or which was in its possession prior to disclosure by the disclosing party,
and of which it did not learn through any contact with the other party previous
to the date hereof, (ii) is presently or later becomes through no violation of
this Agreement, publicly available or a matter of public knowledge generally,
(iii) a party's written records show is lawfully received by the party from a
third party who is (or was) not bound in any confidential relationship to the
other party hereto, (iv) is independently developed by the recipient by
personnel without access to or knowledge of the Proprietary Information and
Technology, or (vi) is approved for release or disclosure by the disclosing
party without restriction.  Each party may disclose Proprietary Information and
Technology which it is legally obligated to disclose, provided that it shall (i)
use its best efforts to avoid such obligation, (ii) strictly limit its
disclosure as permitted by such obligation, and (iii) provide sufficient notice
to the other party of such obligation to enable the other party may challenge or
seek to restrict such disclosure.

     14.0 PRODUCT LABELS AND LITERATURE

     14.1 Tradenames.  IL and OSI agree to include OSI tradename on the Products
and packaging for the Sensors.  IL, at its sole discretion, may include IL
tradename on the Products and packaging for the Sensors.

     14.2 Labeling.  IL will provide to OSI IL's logos, artwork and other
materials to be placed on the Products.  OSI agrees to label the Products, in
accordance with the reasonable instructions of IL, using the logos, artwork and
other materials necessary therefor, provided by IL.  OSI agrees to determine the
work necessary to place IL's Trademarks on the Products and to notify IL of such
work and the costs therefor.  OSI will perform such work, at IL's sole cost and
expense, upon receipt of IL's approval therefor, which shall not be unreasonably
withheld, delayed or conditioned.  The failure of IL to respond to OSI's request
for approval hereunder within thirty (30) days of OSI's request therefor shall
be deemed approval hereunder.  OSI agrees to use IL's Trademarks only on the
Products, and not on any product sold on its or any other entity's behalf, or
for any other purpose.

     14.3 Trademarks.  IL and OSI agree that the Sensors shall bear the
trademark SensiCath(R) as well as IL's Trademark to be selected by IL.

     14.4 Translations.  OSI shall provide, at OSI's expense, Instruments with
displays in the English, German, French, Spanish, Japanese (Kanji only) and
Italian languages.  OSI shall furnish at no cost to IL reasonable quantities of
the Documentation in English, German, French,

                                       16
<PAGE>
 
Spanish, Japanese (Kanji only) and Italian languages.  IL shall be responsible,
at its own expense, for translating the Documentation into such other foreign
languages as IL determines.

     15.0 SUPPORT, SERVICE, MAINTENANCE AND TRAINING.

     15.1 Product Service During Warranty Period.  IL shall make available
service depots that IL maintains for other products sold by IL for the repair or
service of Instruments during the applicable warranty period for such
Instruments.  Instruments that are alleged to be defective and covered by the
warranty set forth in Section 9.2 shall be shipped to such service depots.  OSI
shall maintain an inventory of fifteen (15) loaner Instruments at such depots
which IL may make available to Customers on a loaner basis until such time as
OSI has repaired or replaced such Instrument in accordance with Section 9.2.  If
IL elects to obtain parts or components to repair the Instruments in accordance
with Section 9.2, IL shall repair such Instrument and return it to the Customer.

     15.2 Post Warranty Product Service and Maintenance.  From and after the
expiration of the applicable warranty set forth in Section 9, IL will have sole
responsibility for the maintenance, service and support of Products.  IL agrees
that it will maintain and service Products at various maintenance depots, at its
sole cost and expense; provided, however, that OSI will provide IL up to twenty
four (24) hours of maintenance and service training prior to the expiration of
the applicable warranty period for each type of Product sold hereunder.  OSI
will bear its own personnel expense, including any travel, hotel, and meal
expense, and the expense of providing training materials, to fulfill its
obligations under this provision.

     15.3 Telephone Support.  IL agrees to provide telephone support of the
Products, in accordance with a support plan jointly determined by IL and OSI.
OSI and IL shall jointly review IL's current capability for providing Customer
support and jointly create an action plan to address any deficiencies.  OSI
agrees to provide IL up to 40 hours of telephone support training.  OSI will
bear its own personnel expense, including any travel, hotel, meal expense, and
the expense of providing training materials, to fulfill its obligations under
this provision.

     15.4 Customer Training.  IL agrees to train the Customers in the use of the
Products sold by IL.  OSI agrees to provide IL a complete customer training
program.  OSI will bear its own personnel expense, including any travel, hotel,
and meal expense and the expense of providing the training materials, to fulfill
its obligations under this provision.

     15.5 OSI Technical Support.  OSI agrees to use reasonable efforts to assist
IL in resolving complex maintenance and support issues, relating to the design
and/or manufacture of the Products.  OSI agrees not to take the initiative to
contact any Customer regarding maintenance, service, and/or support unless
directed by IL to do so; provided, however, that OSI shall not be deemed in
breach of this Agreement for a response to a Customer inquiry.  OSI shall

                                       17
<PAGE>
 
notify IL of any Customer contact with OSI.  All service, maintenance and
support provided by OSI hereunder, other than warranty service, will be provided
in accordance with OSI's then current terms and conditions.

     16.0 INFORMATION EXCHANGE

     16.1 Outside U.S.   IL agrees to provide OSI (i) the number of Instruments
sold or leased and the number of Sensors sold, (ii) the number of Sensors given
away for demonstration, (iii) names and contact information of certain key
clients who have purchased the Products, (iv) information regarding performance
of the Products, and (v) information relating to sales opportunities, in each
case on a quarterly basis for each country outside the United States.  IL shall
determine at its sole discretion which of the clients are considered to be the
key clients.

     16.2 Inside U.S.   IL agrees to provide OSI (i) the number of instruments
sold and a list of Customers to whom the Instruments have been sold in the
United States on a monthly basis and (ii) the number of Sensors sold and a list
of Customers to whom the Sensors have been sold in the United States on a
quarterly basis.

     16.3 Customer Lists.     During the term of this Agreement, IL and OSI will
have access to the customer lists, provided under Section 16.1 and 16.2, only so
long as access within each party's organization is limited to specific and
limited groups of employees on a "need to know" basis.  IL and OSI acknowledge
that the customer lists constitute confidential information subject to Section
13.3.

     17.0 MARKETING AND SALES.

     17.1 Annual Meetings.  IL and OSI agree to coordinate advertisement and
promotional activities for the Products.  IL and OSI shall hold an annual
meeting at a place and time to be determined to discuss mutual marketing plans
and to create complementary marketing programs for the upcoming year.  Each
party shall bear its own expenses related to attending the annual meetings.
Each party shall bear the expenses related to the marketing activities initiated
by the party.

     17.2 Support.  IL and OSI shall jointly determine the level of sales
support to be provided in various territories.  IL shall be responsible for
actually providing the sales support.

     17.3 IL Meetings.  OSI shall participate in IL's marketing and sales
meetings as reasonably requested by IL at OSI's own expense.

     17.4 Customer Finance Programs.  IL, at it's sole discretion, shall
coordinate and implement financing programs for Customers, which are consistent
with IL's existing policies and practices.

                                       18
<PAGE>
 
     18.0 EXPORT LAWS.

     18.1 IL hereby expressly acknowledges that technical data and the direct
product thereof are subject to export controls of the United States and agrees
that neither technical data nor the direct product thereof will be transferred,
directly or indirectly, to any destination contrary to the requirements of the
laws of the United States or to the terms of any applicable export license.
Further, IL hereby provides its assurance that it will not knowingly participate
in any transaction which may involve any commodity or technical data, or the
direct product thereof, exported or to be exported from the United States, if a
person denied export privileges from the United States may obtain any benefit
from or have any interest in, directly or indirectly, such transaction.

     19.0 RECALLS; COMPLAINTS; INCIDENTS.

     19.1 Complaints and Incidents.  In the event a party hereto becomes aware
of an event or incident required to be reported to a governmental agency or
which is likely, with the passage of time, to be required to be reported to a
governmental agency, such party shall promptly notify the other party.  The
notifying party shall use reasonable efforts to give such notice to the other
party within 24 hours after notice of the complaint or event.  Within thirty
(30) days after the commencement of each calendar quarter during the Term, IL
shall provide OSI with a summary report regarding complaints and/or incidents it
has received that relate to the design and/or manufacture of the Products.  The
parties shall cooperate with each other concerning the investigation of any such
complaints.  If any regulatory body contacts either party hereto to inquire
about or investigate any Product, the party contacted shall (unless it has been
requested to maintain confidentiality about the inquiry by the regulatory
authority) use its best efforts to give notice to the other party, within 24
hours of receipt of such contact from such regulatory body.

     19.2 Recalls.  In the event OSI, IL, or both parties deem it necessary to
take any corrective action (including notifications or recalls) with respect to
any Products sold or distributed by IL, regardless of whether such action is
initiated to comply with applicable laws or regulations or for other reasons,
the parties agree that (a) IL shall be the point of contact for Customers, (b)
OSI shall be responsible for replacing or repairing the recalled Products, (c)
OSI will reimburse IL for all direct costs and expenses incurred in the process
of recall, including but not limited to the cost of replacing or repairing the
Products, cost of receiving and handling returned Products and the cost of
transporting the Products back to the Customers and (d) IL will bear the cost of
notifying the Customers of recall and Customer costs of returning the recalled
Products to IL.  In the event of a recall, IL and OSI shall jointly (i) define
the corrective action strategy, (ii) define the level of recall (e.g.,
distributor level or end-user), and (iii) define the effective check procedure
(to establish that the corrective action has been completed).

                                       19
<PAGE>
 
     20.0 TERM AND TERMINATION.

     20.1 Term.  This Agreement will commence on the Effective Date and, unless
terminated in accordance with the terms hereof, will continue until December 31,
2004 with respect to the sections relating to distribution of the Instruments
and until December 31, 2007 with respect to the sections relating to
distribution of the Sensors and the Replacement Parts.

     20.2 Termination for Cause.  Either party has the right to terminate this
Agreement if, after thirty (30) days written notice to the other party, the
other party remains in breach of any material obligation under this Agreement.

     20.3 Bankruptcy, Etc.  Either party has the right to terminate this
Agreement by written notice to the other party upon the other party's bankruptcy
or its inability to pay its debts as they mature, or its making of an assignment
for the benefit of creditors, or its application for the appointment of a
trustee or receiver for the other party, or for any part of its property, or the
institution by or against the other party of any bankruptcy, reorganization,
arrangement, insolvency or liquidation proceedings or other proceedings for
relief of debtors which is allowed against the other party or is consented to or
is not dismissed, stayed or otherwise nullified within sixty (60) days after the
institution thereof, or upon the sale of all or substantially all of the other
party's assets pertaining to OSI's technology to a competitor of such party.

     20.4 Force Majeure.  Either party may terminate this Agreement by giving
notice in writing to the other party should an event of Force Majeure preventing
performance by such other party continue for more than one hundred eighty (180)
consecutive days as provided in Section 21.7.

     20.5 Change in Control of OSI.  OSI shall have the right, at its sole
discretion, to convert this Agreement into a non-exclusive distributorship
agreement upon  a Change in Control of OSI during the term of this Agreement.
Should OSI convert this Agreement to a non-exclusive distributorship agreement
due to a Change in Control of OSI, IL shall have the right, at its sole
discretion, to terminate this Agreement.

     20.6 Rights and Obligations on Termination.  In the event of termination of
this Agreement for any reason, the parties shall have the following rights and
obligations:

     (a)  Termination of this Agreement shall not release either party from the
          obligation to make payment of all amounts then or thereafter due and
          payable.

     (b)  Upon termination of this Agreement, IL, at its sole option, shall have
          the right to sell to Customers or to return to OSI any Product in IL's
          possession or control that are in the original packaging and in good
          repair and have more than forty-five (45) days' remaining shelf-life
          for a refund of invoiced price (exclusive of any shipping or packaging
          charges or taxes) to IL for such Product.  In the event, IL

                                       20
<PAGE>
 
          elects to sell to Customers, the licenses granted to IL in Section 5
          hereof shall extend to those Products that IL elects to sell to
          Customers.

     (c)  Upon termination of this Agreement, all licenses granted to IL prior
          to the Effective Date of termination shall terminate; except any and
          all rights granted by IL to its Customers to use the Products shall
          survive termination, and OSI shall not object to or interfere with the
          continued use of the Products by such Customers.

     (d)  If this Agreement terminates prior to December 31, 2004, OSI agrees to
          sell to IL Sensors and Replacement Parts, at the prices in effect at
          the time of termination, for IL's sales to Customers for three (3)
          years following the date of termination.  If this Agreement terminates
          between January 1, 2005 and December 31, 2007, OSI agrees to sell to
          IL Sensors and Replacement Parts, at the prices in effect at the time
          of termination, for IL's sales to Customers until December 31, 2007.

     (e)  Subject to Section 20.5(f), the terminating party shall have the
          right, at its option, to cancel any or all purchase orders which
          provide for delivery after the effective date of termination.

     (f)  If OSI terminates this Agreement and IL in good faith disputes such
          termination and in good faith attempts to resolve such dispute, OSI
          shall continue to supply to IL Products at the prices in effect at the
          time of termination on a non-exclusive basis, until such time as the
          dispute is resolved for a period of not more than twelve (12) months.

     (g)  The parties obligations pursuant to Section 9, 12, and 13.3 shall
          survive termination of this Agreement.

     (h)  Upon termination of this Agreement, OSI may not sell directly or
          through any other party the Products manufactured by OSI to the
          customers listed on the Customer Lists in Section 16.1 and 16.2, until
          the earlier of three (3) years after termination or December 31, 2007
          provided IL continues to sell Product or New Product to such Customers
          at substantially equivalent levels prior to termination.

     20.7 Non-Exclusive Remedies.  The rights and remedies set forth in this
Section 20 are in addition to any other rights or remedies which otherwise may
be available, in law or in equity, consistent with the terms of this Agreement.

     20.8 Subdistributors.  If OSI terminates this Agreement in accordance with
its rights under this Section 20, or this Agreement expires in accordance with
its terms, IL shall have sole responsibility for termination of any
subdistributor, including any costs or expenses associate therewith, and shall
indemnify and hold OSI harmless from and against any claim, loss, damage

                                       21
<PAGE>
 
or expense (including reasonable attorneys' fees) suffered or incurred by OSI
relating to the termination of any subdistributor appointed by IL.

     21.0 GENERAL.

     21.1 Notices.  All notices and other communications given hereunder shall
be sent to the parties at the addresses set forth below (or such other address
of which any party will have given written notice to the other party) by
facsimile, overnight air courier, service fee prepaid, or certified or
registered mail, postage prepaid and return receipt requested.  Notices so given
shall be effective upon the earlier of:  (a) receipt by the party to which
notice is given (which, in the instance of a facsimile, shall be deemed to have
occurred at the time that the machine transmitting the facsimile verifies a
successful transmission of the facsimile); (b) on the fifth business day
following the date such notice was deposited in the mail; or (c) on the second
business day such notice was delivered to a commercial air delivery service.

OSI:                                IL:
Optical Sensor Incorporated         Instrumentation Laboratory Company
7615 Golden Triangle Drive          101 Hartwell Avenue
Technology Park Drive               Lexington, MA 02173
Minneapolis, MN 55344               Attention:  Vice President, Critical Care

Attention: President and CEO        Facsimile:  (781) 862-8964

Facsimile: (612) 914-9441

     21.2   Severability.  If any provision of this Agreement is or becomes, at
any time or for any reason, unenforceable or invalid, no other provision of this
Agreement shall be affected thereby, and the remaining provisions of this
Agreement shall continue with the same effect as if such unenforceable or
invalid provision shall not have been inserted in this Agreement, provided that
the essential bargained-for performance of the parties shall not thereby have
been impaired.

     21.3 Waiver of Compliance.  Any failure by any party to this Agreement to
enforce at any time any term or condition under this Agreement will not be
considered a waiver of that party's right thereafter to enforce each and every
term and condition of this Agreement. Waivers hereunder must be in writing to be
enforceable.

     21.4 Scope of Agreement.  This Agreement, including the exhibits' attached
hereto and incorporated as an integral part of this Agreement, constitutes the
entire agreement of the parties with respect to the subject matter hereof, and
supersedes all previous proposals, oral or written, and all negotiations,
conversations or discussions heretofore had between the parties related to this
Agreement.

     21.5 Governing Law.  This Agreement and its performance and all claims
arising from 

                                       22
<PAGE>
 
the relationship between the parties contemplated herein, whether or not arising
directly under this Agreement, will be governed by and construed in accordance
with the laws of the Commonwealth of Massachusetts.

     21.6 Assignment.  This Agreement is not assignable by either party hereto
without prior written consent of the other party, other than in connection with
a Change in Control; provided, however, that both parties shall be authorized to
assign this Agreement or any obligation or benefit hereunder to an Affiliate
without the other party's consent.  Any attempt by either party to effect any
prohibited assignment without such consent shall be void.  All terms and
conditions of this Agreement shall be binding on and inure to the benefit of the
successors and permitted assigns of the parties.

     21.7   Force Majeure.  Neither party shall be held responsible for any
delay or failure in performance hereunder (other than the obligation to pay
money) caused in whole or in part by fires, strikes, floods, embargoes, labor
disputes, acts of sabotage, riots, accidents, delays of carriers or suppliers,
voluntary or mandatory compliance with any governmental act, regulation or
request, or acts of God or by public enemy.  If any such contingency shall
occur, either party may elect to either (i) suspend this Agreement for the
duration of the delaying cause; or (ii) extend the duration of this Agreement by
the length of time the contingency endured.

     21.8 Arbitration.  Any dispute, controversy or claim arising out of or
relating to this Agreement, or the breach, termination or invalidity thereof,
shall be finally settled by arbitration in accordance with the Commercial
Arbitration Rules of the American Arbitration Association in effect on the date
of this Agreement by a single arbitrator who shall be experienced in the medical
device industry and who shall be appointed in accordance with such rules.  If
the arbitration is initiated by OSI, the place of arbitration shall be Boston,
Massachusetts, if the arbitration is initiated by IL, the place of arbitration
shall be Minneapolis, Minnesota.

     21.9 Amendment.  This Agreement shall not be deemed or construed to be
modified, amended, rescinded, canceled or waived, in whole or in part, other
than by written amendment signed by the parties hereto, except as expressly
provided in this Agreement.

     21.10   Independent Contractor.  Each party shall be deemed an independent
contractor hereunder, and as such, shall not be deemed, nor hold itself out to
be, an agent or employee of the other party.  Under no circumstances shall any
of the employees of either party hereto be deemed to be employees of the other
party for any purpose.  This Agreement shall not be construed as authority for
either party to act for the other party in any agency or other capacity, or to
make commitments of any kind of the account of or on behalf of the other except
to the extent and for the purposes provided herein.

                                       23
<PAGE>
 
     21.11  Counterparts.  This Agreement may be executed in one or more
counterparts, each of which will be deemed to be an original and all of which
together will be deemed to be one and the same instrument.

     21.12  Publicity.  No public release or announcement concerning the
transactions contemplated hereby shall be issued by any party hereto without the
prior consent of the other party hereto (which consent shall not be unreasonably
withheld), except as such release or announcement may be required by law or the
rules or regulations of the Securities and Exchange Commission, in which case
the party required to make the release or announcement shall give the other
party notice in advance of such issuance. IL acknowledges that OSI will file
this Agreement with the Securities and Exchange Commission, and OSI will use its
best efforts to obtain confidential treatment for the pricing information
contained in this Agreement and for Exhibits B, C and D.

                    [REST OF PAGE INTENTIONALLY LEFT BLANK]

                                       24
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Agreement to be executed
by their respective duly authorized representatives as of the Effective Date.

<TABLE>
<CAPTION>
<S>                                            <C>
OSI:                                           IL:
 
OPTICAL SENSORS                                INSTRUMENTATION LABORATORY
INCORPORATED                                   COMPANY
 
By:   /s/ Sam B. Humphries                     By:     /s/ John J. Sperzel
      --------------------------------------         --------------------------------------
 
Name:     Sam B. Humphries                     Name:   John J. Sperzel
      --------------------------------------         --------------------------------------
 
Title: President and Chief Executive Officer   Title: V.P. Critical Care
      --------------------------------------         --------------------------------------
 
Date:  January 7, 1998                         Date:  January 7, 1998
      --------------------------------------         --------------------------------------
</TABLE>

                                       25
<PAGE>
 
                                   EXHIBIT A

     Part Number            Title / Description
     -----------            -------------------

     01658                  OpticalCAM(TM)  BLOOD MEASUREMENT SYSTEM
                              Monitor
                              Power cord
                              ABG module
                              Interconnect cable
                              Operator's manual

     01832                  SENSICATH(R) OPTICAL SENSOR UNIT - SC+
                              SensiCath Sensor Device
                              3 way stopcock (2 ea)
 
     01252                  STANDARD SET-UP COMPONENTS
                              Volume restricted syringe,
                              12" tubing w/ stopcock,
                              48" pressure line w/Luer locks
 
     01253                  MODIFIED SET-UP COMPONENTS
                              6" Extension tubing
 
     01821                  INITIALIZATION PACK WITH QA POUCH - 1,2,QA
                              Level #1 & Level #2 Pouch
                              6" Extension tubing w/ spike
                              10 cc Syringe w/ needle (2 ea)
                              20 ml Sodium Chloride, Inj.
                              Male Luer cap (2 ea)
                              QA Check Pouch

     01822                  QA CHECK PACK - QA
                              QA Check Pouch
                              6" Extension tubing w/ spike
                              10 cc Syringe w/ needle
                              20 ml Sodium Chloride, Inj.
                              Male Luer cap (2 ea)

     01660                  OPTICALCAM PRINTER PACKAGE
                              Hewlett-Packard printer (1 roll paper, 4 AA
                              batteries) Printer holder w/ 3 screws

     01641                  OPTICALCAM ROLL STAND (GCX)
                              Cart with mounting bracket
                              Basket
 

                                       26
<PAGE>
 
                                   EXHIBIT B

[THIS EXHIBIT HAS BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIALITY UNDER
RULE 24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.  A COPY OF THIS
AGREEMENT WITH THIS EXHIBIT INTACT HAS BEEN FILED SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION.]

                                       27
<PAGE>
 
                                   EXHIBIT C
                                        
[THIS EXHIBIT HAS BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIALITY UNDER
RULE 24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.  A COPY OF THIS
AGREEMENT WITH THIS EXHIBIT INTACT HAS BEEN FILED SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION.]

                                       28
<PAGE>
 
                                   EXHIBIT D


[THIS EXHIBIT HAS BEEN OMITTED PURSUANT TO A REQUEST FOR CONFIDENTIALITY UNDER
RULE 24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.  A COPY OF THIS
AGREEMENT WITH THIS EXHIBIT INTACT HAS BEEN FILED SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION.]

                                       29

<PAGE>
 
                                                                    EXHIBIT 10.2
================================================================================

                                 STOCK PURCHASE

                                   AGREEMENT

                                    between

                          OPTICAL SENSORS INCORPORATED

                                      and

                             GRUPO CH WERFEN, S.A.

                          Dated as of January 7, 1998

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                         Page
                                                                         ----
ARTICLE I DEFINITIONS..................................................    1 
 Section 1.1   Definitions.............................................    1

ARTICLE II PURCHASE AND SALE; CLOSING..................................    4
 Section 2.1   Issuance, Purchase and Sale of the Shares...............    4
 Section 2.2   Closing.................................................    4
 Section 2.3   Actions at the Closing..................................    4

ARTICLE III REPRESENTATIONS AND WARRANTIES OF THE COMPANY..............    4
 Section 3.1   Organization and Qualification..........................    4
 Section 3.2   Authority...............................................    5
 Section 3.3   SEC Reports.............................................    5
 Section 3.4   Financial Statements; Material Adverse Change...........    5
 Section 3.5   Capitalization..........................................    6
 Section 3.6   The Purchased Shares....................................    6
 Section 3.7   Reseller Agreement......................................    7

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF WERFEN....................    7
 Section 4.1   Organization and Qualification..........................    7
 Section 4.2   Authority...............................................    7
 Section 4.3   Investment..............................................    8

ARTICLE V TRANSFER.....................................................    8
 Section 5.1   Legend..................................................    8
 Section 5.2   Limitation on Transfer..................................    9

ARTICLE VI COVENANTS...................................................    9
 Section 6.1   Standstill..............................................    9
 Section 6.2   Anti-Dilution Rights....................................   10
 Section 6.3   Registration Rights; Warrant............................   11
 Section 6.4   Access..................................................   12

AR TICLE VII CONDITIONS TO WERFEN'S OBLIGATIONS........................   12
 Section 7.1   Representations, Warranties, Covenants, Material Change.   12
 Section 7.2   No Prohibition; Litigation..............................   12
 Section 7.3   Certificates and Resolutions............................   12
 Section 7.4   Legal Opinion...........................................   13
 Section 7.5   Due Diligence...........................................   13
 Section 7.6   Regulatory Approvals....................................   13

                                      -i-
<PAGE>
 
 Section 7.7   Registration Right; Warrant.............................   13

ARTICLE VIII TERMINATION...............................................   13
 Section 8.1   Termination.............................................   13
 Section 8.2   Effect on Obligations...................................   14

ARTICLE IX MISCELLANEOUS...............................................   14
 Section 9.1   Survival................................................   14
 Section 9.2   Expenses................................................   14
 Section 9.3   Exclusive Agreement; No Third-Party Beneficiaries.......   14
 Section 9.4   Governing Law, Etc. ....................................   14
 Section 9.5   Successors and Assigns..................................   15
 Section 9.6   Publicity...............................................   15
 Section 9.7   Severability............................................   15
 Section 9.8   Notices.................................................   16
 Section 9.9   Counterparts; Facsimile Signatures......................   17
 Section 9.10  Interpretation..........................................   17
 Section 9.11  Amendment...............................................   17
 Section 9.12  Extension; Waiver.......................................   17
 Section 9.13  Indemnity...............................................   18

ANNEX A INDEMNIFICATION................................................  A-1
 Section A.1   Losses..................................................  A-1
 Section A.2   Indemnification by the Company..........................  A-1
 Section A.3   Indemnification by Werfen...............................  A-1
 Section A.4   Claims..................................................  A-1
 Section A.5   Exclusive Remedy........................................  A-2

                                     -ii-
<PAGE>
 
                            STOCK PURCHASE AGREEMENT
                            ------------------------

     THIS STOCK PURCHASE AGREEMENT, dated as of January 7, 1998 (with the Annex
attached hereto, this "Agreement"), between Optical Sensors Incorporated, a
Delaware corporation (the "Company"), and Grupo CH Werfen, S.A., a company
organized under the laws of the Kingdom of Spain ("Werfen").

     WHEREAS, on the date hereof the Company is entering into a Private Label
Reseller Agreement (the "Reseller Agreement") with Instrumentation Laboratory
Company, a Delaware corporation ("ILC");

     WHEREAS, in connection with entering into the Reseller Agreement, the
Company desires to sell and Werfen desires to buy shares of common stock of the
Company on the terms and conditions set forth herein; and

     WHEREAS, the Company and Werfen desire to provide for such sale and to
establish various rights and obligations in connection therewith.

     NOW THEREFORE, in consideration of the premises and the mutual covenants
and agreements herein set forth, the parties hereto hereby agree as follows:

                                   ARTICLE I

                                  DEFINITIONS
                                  -----------

     Section 1.1 Definitions. As used in this Agreement or the Annex hereto, the
following terms have the respective meanings set forth below:

               "Affiliate":  means (i) with respect to a Person, any other
     Person directly or indirectly controlling, controlled by or under common
     control with such Person or (ii) with respect to an individual, any
     individual in such individual's immediate family.

               "Anti-Dilution Notice Period":  as defined in Section 6.2.

               "Anti-Dilution Rights Notice":  as defined in Section 6.2.

               "Anti-Dilution Shares":  as defined in Section 6.2.

               "Business Day":  shall mean any day other than a Saturday or
     Sunday, which is a day (i) on which banking institutions in the State of
     New York are authorized or obligated by law or executive order to close and
     (ii) which is a regular trading day on the Nasdaq National Market.

               "Closing":  as defined in Section 2.2.

                                       1
<PAGE>
 
               "Closing Date":  as defined in Section 2.2.

               "Commission":  the Securities and Exchange Commission or any
     other Federal agency at the time administering the Securities Act.

               "Common Stock":  as defined in Section 3.5.

               "Common Stock Equivalents":  shall mean any rights, warrants or
     options to purchase stock or other securities (including rights under the
     Rights Agreement, dated December 3, 1996, between the Company and Norwest
     Bank Minnesota, N.A.), exchangeable for or convertible into Common Stock.

               "Company":  as defined in the preamble to this Agreement.

               "Exchange Act":  the Securities Exchange Act of 1934, as amended,
     and the rules and regulations promulgated thereunder.

               "ILC":  as defined in the preamble to this Agreement.

               "Indemnified Party":  as defined in Section A.4.

               "Indemnifying Party":  as defined in Section A.4.

               "Lien":  shall mean all liens, claims, charges, security
     interests, pledges, mortgages, rent charges, covenants, easements,
     restrictions or other encumbrances, obligations or restrictions or rights
     or claims of others (including, without limitation, any options or similar
     rights) of any character whatsoever which impair the relevant Person's
     right, title or interest in, or the value, use or enjoyment of, the asset
     subject thereto, except with respect to securities, Liens imposed by
     applicable securities laws.

               "Losses":  as defined in Section A.1.

               "Material Adverse Effect":  as defined in Section 3.1.

               "New Equity Securities":  shall mean any Common Stock or Common
     Stock Equivalents of the Company which are not outstanding on the Closing
     Date; provided, however, that "New Equity Securities" shall not include (i)
     Common Stock and Common Stock Equivalents which are granted to the
     Company's officers, directors, employees or consultants pursuant to any
     stock option, stock purchase or similar employee benefit plan approved by
     the Company's board of directors, (ii) Common Stock issued upon the
     exercise or conversion of the Common Stock Equivalents outstanding on the
     date hereof or

                                       2
<PAGE>
 
     referred to in clause (i) of this definition and (iii) Common Stock issued
     in an underwritten public offering.

               "Person":  any natural person, corporation, partnership, limited
     liability company, firm association, trust, government, government agency
     or other entity, whether acting in an individual, fiduciary or other
     capacity.

               "Preferred Stock":  as defined in Section 3.5.

               "Purchase Price":  the product of (i) $5.00 times (ii) the number
     of Shares included in the Purchased Shares.

               "Purchased Shares":  441,203 Shares.

               "Record Holder":  as defined in Section 6.2.

               "Registration Rights Agreement":  the Registration Rights
     Agreement, as amended through November 14, 1995, between the Company and
     each of the several Persons named on Schedule I thereto.

               "Reseller Agreement":  as defined in the preamble to this
     Agreement.

               "SEC Reports":  as defined in Section 3.3.

               "Securities Act":  as defined in Section 4.3.

               "Shares":  shares of Common Stock.

               "Subsidiary":  of any Person shall mean any corporation or other
     legal entity of which such Person (either alone or through or together with
     any other Subsidiary) owns, directly or indirectly, 50% or more of the
     stock or other equity interest, the holders of which are generally entitled
     to vote for the election of the board of directors or other governing body
     of such Person.

               "Third Party Claim":  as defined in Section A.4.

               "Transfer":  as defined in Section 5.3.

               "Warrant":  a warrant issued to Werfen or its assignee pursuant
     to which Werfen or its assignee is granted the right to acquire (in one or
     more transactions), on or prior to the Warrant Exercise Date, at $5.00 per
     Share, up to 168,011 Shares, subject to customary anti-dilution provisions,
     including, without limitation, stock splits, in a form satisfactory to
     Werfen.

                                       3
<PAGE>
 
               "Warrant Exercise Date":  the third anniversary of the Closing
     Date.

               "Werfen":  as defined in the preamble to this Agreement.

                                   ARTICLE II

                           PURCHASE AND SALE; CLOSING
                           --------------------------

     Section 2.1 Issuance, Purchase and Sale of the Shares. Upon the terms and
subject to the conditions of this Agreement, (i) the Company shall sell to
Werfen, and Werfen shall purchase from the Company the Purchased Shares and (ii)
Werfen shall pay or cause to be paid to the Company, the Purchase Price.

     Section 2.2 Closing. Subject to the terms and conditions of this Agreement,
the consummation of the purchase and sale of the Purchased Shares (the
"Closing") shall take place at the offices of Fried, Frank, Harris, Shriver &
Jacobson, One New York Plaza, New York, New York, 10004, at 10:00 a.m., local
time, on the first Business Day immediately following the day on which the last
to be fulfilled or waived of the conditions set forth in Article VII shall be
fulfilled or waived in accordance herewith (or, if contemplated to be satisfied
simultaneously with the Closing, are capable of being satisfied), or at such
other time, date or place as is agreed to in writing by the parties hereto. The
date on which the Closing shall occur is hereinafter referred to as the "Closing
Date".

     Section 2.3 Actions at the Closing. At the Closing, (i) the Company shall
deliver, at the direction of Werfen, certificates representing the Purchased
Shares, duly authorized and issued in the name of Werfen, free and clear of all
Liens and (ii) Werfen shall deliver or cause to be delivered, to the Company,
the Purchase Price, by wire transfer in immediately available funds, to an
account or accounts designated at least two days prior to the Closing Date by
the Company in a written notice to Werfen.

                                  ARTICLE III

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                 ---------------------------------------------

     The Company hereby represents and warrants to Werfen as follows:

     Section 3.1 Organization and Qualification. The Company is a corporation
duly organized, validly existing and in good standing under the laws of the
jurisdiction in which it is incorporated and has all requisite power to own its
property and to carry on its business as now being conducted. The Company is
duly qualified as a foreign corporation to do business and is in good standing
in every jurisdiction in which the nature of the business conducted or property
owned by it makes such qualification necessary and where the failure so to
qualify would be, individually or in the aggregate, reasonably likely to cause a
material adverse effect on the business, condition (financial

                                       4
<PAGE>
 
or otherwise), operations, assets or prospects of the Company (a "Material
Adverse Effect").  The Company does not have any Subsidiaries.

     Section 3.2 Authority. The execution and delivery of this Agreement and the
issuance and the sale of the Purchased Shares, (i) are within the corporate
power and authority of the Company, (ii) do not or will not require the approval
or consent of the stockholders of the Company, (iii) have been duly authorized
by all requisite corporate proceedings on the part of the Company, except for
approval of this Agreement by the board of directors of the Company which shall
have been obtained by the Closing Date and (iv) do not conflict with, or result
in, a breach of, any law or regulation of any governmental authority applicable
to the Company or any agreement to which the Company is a party. This Agreement
has been duly executed and delivered by the Company and constitutes a valid and
binding agreement of the Company, enforceable in accordance with its terms,
subject to bankruptcy, insolvency, fraudulent transfer, moratorium and other
similar laws of general applicability relating to or affecting creditors' rights
and to general equity principles. Werfen acknowledges that the Company's
obligations are subject to the approval of the Company's board of directors
which will be obtained prior to January 14, 1998.

     Section 3.3 SEC Reports. The Company has timely filed all proxy statements,
reports and other documents required to be filed by it under the Securities Act
and the Exchange Act (collectively, the "SEC Reports"). Each SEC Report was in
compliance with the requirements of its respective report form and did not on
the date of filing contain any untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

     Section 3.4 Financial Statements; Material Adverse Change. The financial
statements (including any related notes) included in the SEC Reports have been
prepared in accordance with Regulation S-X under the Securities Act and the
Exchange Act and in accordance with United States generally accepted accounting
principles consistently followed (except as indicated in the notes thereto)
throughout the periods involved and fairly present the financial condition,
results of operations, statement of cash flows and changes in stockholders'
equity of the Company as of the dates thereof and for the periods ended on such
dates (in each case subject, as to interim statements, to changes resulting from
year-end adjustments, none of which will be material in amount or effect). The
Company has no material liabilities, contingent or otherwise, not reflected on
the Company's balance sheet as of September 30, 1997 included in the SEC
Reports, other than any such liabilities incurred in the ordinary course of
business since September 30, 1997. Since September 30, 1997, the Company has
operated its business only in the ordinary course and there has been no Material
Adverse Effect since such date.

                                       5
<PAGE>
 
     Section 3.5 Capitalization. The authorized capital stock of the Company
consists of 5,000,000 shares of preferred stock, par value $.01 per share (the
"Preferred Stock") and 30,000,000 shares of common stock, par value $.01 per
share (the "Common Stock"). No shares of Preferred Stock are outstanding and
8,400,554 shares of Common Stock are outstanding. Except as set forth in the
preceding sentence, no shares of capital stock of the Company are issued or
outstanding. All of the outstanding shares of Common Stock have been validly
issued and are fully paid and nonassessable. No capital stock of the Company is
entitled to preemptive rights or contracts, commitments, understandings, or
arrangements by which the Company is or may become bound to issue additional
shares of its capital stock or rights to purchase or acquire any shares of its
capital stock. The Company is not subject to any obligation (contingent or
otherwise) to repurchase or otherwise acquire or retire any of the shares of its
capital stock. Except for options to purchase an aggregate of not more than
830,000 Shares, warrants to purchase 134,604 Shares and rights under the Rights
Agreement, dated December 3, 1996, between the Company and Norwest Bank
Minnesota, N.A., there are no Common Stock Equivalents outstanding, as of the
date hereof. Except for the right of certain Persons pursuant to the
Registration Rights Agreement to register approximately 3,500,000 Shares and
134,604 Shares which are issuable upon the exercise of warrants, no Person has
any right to request or require the Company to register any Common Stock or any
Common Stock Equivalents under the Securities Act.

     Section 3.6 The Purchased Shares. Upon the issuance of the Purchased Shares
to Werfen, the Purchased Shares will be validly issued, fully paid and
nonassessable. Other than this Agreement, upon the issuance of the Purchased
Shares to Werfen at the Closing, the Purchased Shares will not be subject to any
voting trust agreement or other contract, agreement, arrangement, commitment or
understanding to which the Company is a party, including any such agreement,
arrangement, commitment or understanding restricting or otherwise relating to
the voting, dividend rights or disposition of the Purchased Shares.

     Section 3.7 Reseller Agreement. The execution and delivery of the Reseller
Agreement, (i) are within the corporate power and authority of the Company, (ii)
do not or will not require the approval or consent of the stockholders of the
Company, (iii) have been duly authorized by all requisite corporate proceedings
on the part of the Company and (iv) do not conflict with, or result in, a breach
of, any law or regulation of any governmental authority applicable to the
Company or any agreement to which the Company is a party. The Reseller Agreement
has been duly executed and delivered by the Company and constitutes a valid and
binding agreement of the Company, enforceable in accordance with its terms,
subject to bankruptcy, insolvency, fraudulent transfer, moratorium and other
similar laws of general applicability relating to or affecting creditors' rights
and to general equity principles.

                                       6
<PAGE>
 
                                   ARTICLE IV

                    REPRESENTATIONS AND WARRANTIES OF WERFEN
                    ----------------------------------------

     Werfen hereby represents and warrants to the Company as follows:

     Section 4.1 Organization and Qualification. Werfen is a company duly
organized, validly existing and in good standing (where applicable) under the
laws of the Kingdom of Spain and has all requisite power to own its respective
property and to carry on its respective business as now being conducted. Werfen
indirectly owns 54.3% of the outstanding capital stock of Instrumentation
Laboratory S.p.A., a company organized under the laws of Italy, which owns 100%
of the outstanding common stock of ILC.

     Section 4.2 Authority. The execution and delivery of this Agreement and the
purchase of the Purchased Shares, (i) are within the corporate power and
authority of Werfen, (ii) do not or will not require the approval or consent of
the stockholders of Werfen and (iii) have been duly authorized by all requisite
corporate proceedings on the part of Werfen. This Agreement has been duly
executed and delivered by Werfen and constitutes a valid and binding agreement
of Werfen, enforceable in accordance with its terms, subject to bankruptcy,
insolvency, fraudulent transfer, moratorium and other similar laws of general
applicability relating to or affecting creditors' rights and to general equity
principles.

     Section 4.3 Investment. (a) The Purchased Shares are being acquired for
investment for Werfen's own account and not with the view to, or for resale in
connection with, any distribution or public offering thereof. Werfen understands
that the Purchased Shares have not been registered under the Securities Act of
1933, as amended (the "Securities Act"), or any state securities laws by reason
of their contemplated issuance in transactions exempt from the registration
requirements of the Securities Act and applicable state securities laws and that
the reliance of the Company and others upon these exemptions is predicated in
part upon this representation by Werfen. Werfen further understands that the
Purchased Shares may not be transferred or resold without registration under the
Securities Act and any applicable state securities laws, or an exemption from
the requirements of the Securities Act and applicable state securities laws.

     (b) Werfen's principal office is located at the address set forth in
Section 9.8(b) hereof and is not a U.S Person within the meaning of Rule 902
under the Securities Act.

     (c) Werfen qualifies as an "accredited investor" as defined in Rule 501
under the Securities Act.  Werfen acknowledges that the Company has made
available to Werfen at a reasonable time prior to the execution of this
Agreement the opportunity to ask questions and receive answers concerning the
business, operations and financial

                                       7
<PAGE>
 
condition of the Company and the terms and conditions of the issuance of the
Purchased Shares contemplated by this Agreement and to obtain any additional
information (which the Company possesses or can acquire without unreasonable
effort or expense) as may be necessary to verify the accuracy of information
furnished to Werfen. Werfen is able to bear the loss of its entire investment in
the Purchased Shares without any material adverse affect on its business,
operations or prospects, and has such knowledge and experience of financial and
business matters that it is capable of evaluating the merits and risks of an
investment in the Purchased Shares.

                                   ARTICLE V

                                    TRANSFER
                                    --------

     Section 5.1 Legend. Werfen acknowledges that the certificate representing
the Purchased Shares will bear the following or a substantially similar legend:

     THE SHARES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE U.S.
     SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND MAY NOT BE
     OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT (1) IN AN OFFSHORE
     TRANSACTION MEETING THE REQUIREMENTS OF RULE 903 OR RULE 904 OF REGULATION
     S UNDER THE SECURITIES ACT, (2) PURSUANT TO AN EXEMPTION FROM REGISTRATION
     UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE),
     (3) TO AN ACCREDITED INVESTOR WITHIN THE MEANING OF REGULATION D UNDER THE
     SECURITIES ACT IN A TRANSACTION EXEMPT FROM THE REGISTRATION REQUIREMENTS
     OF THE SECURITIES ACT (IF AVAILABLE) OR (4) PURSUANT TO AN EFFECTIVE
     REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND, IN EACH CASE (1)
     THROUGH (4), IN ACCORDANCE WITH ALL APPLICABLE SECURITIES LAWS OF THE
     STATES OF THE UNITED STATES AND OTHER JURISDICTIONS AND, IN THE CASE OF
     (3), RECEIPT BY THE COMPANY OF AN OPINION OF COUNSEL REASONABLY
     SATISFACTORY TO THE COMPANY THAT SUCH TRANSFER IS EXEMPT FROM THE
     REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

     Section 5.2 Limitation on Transfer. Werfen covenants and agrees that it
shall not directly or indirectly sell, transfer, assign, pledge or otherwise
dispose of (a "Transfer") all or a part of the Purchased Shares prior to the
first anniversary of the 

                                       8
<PAGE>
 
Closing Date, and any Transfer in violation of this section will be null and
void; provided, however, that Werfen may, prior to the first anniversary of the
Closing Date (i) Transfer all or a part of the Purchased Shares to any Affiliate
of Werfen, provided that such Affiliate becomes a signatory to, and agrees to be
bound by, this Agreement and (ii) Transfer all or a part of the Purchased Shares
pursuant to the Registration Rights Agreement, as amended in accordance with
Section 6.3(i).

                                   ARTICLE VI

                                   COVENANTS
                                   ---------

     Section 6.1 Standstill. At any time prior to the fifth anniversary of the
Closing Date:

     (a) Werfen covenants and agrees that it and its Affiliates shall not, and
shall not act in concert with any Person so as to form a group (as such term is
used in Rule 13d promulgated under the Exchange Act) to, in any manner, acquire,
agree to acquire or make any proposal to acquire, directly or indirectly, any
Common Stock in excess of 5% of the outstanding Shares at the time of such
acquisition, without the prior approval of the board of directors of the Company
except for (i) Shares purchased pursuant to the anti-dilution right provided for
in Section 6.2, (ii) Shares issued as a dividend on or other distribution with
respect to or in exchange, replacement or in subdivision of, the Purchased
Shares, (iii) Shares purchased by or on behalf of a pension, retirement, 401(k)
or similar plan provided, however, that the Shares acquired pursuant to this
clause (iii) are voted by the plan participants or by a trustee for the benefit
of the participants or (iv) Shares issued pursuant to the exercise the Warrant.

     (b) For so long as Werfen and its Affiliates own greater than 2 1/2 percent
of the then outstanding Shares, Werfen shall not, directly or indirectly,
through one or more intermediaries or otherwise, and shall cause each of its
Affiliates not to, singly or as part of a partnership, limited partnership,
syndicate or other group (as those terms are used within the meaning of Section
13(d)(3) of the Exchange Act:

               (i) deposit any Shares in a voting trust or subject any Shares to
     any arrangement or agreement with respect to the voting of such Shares;

               (ii) make, or in any way participate in, any "solicitation" of
     "proxies" (as such terms are defined or used in Regulation 14A under the
     Exchange Act) with respect to any Shares (including by the execution of
     actions by written consent), become a "participant" in an "election
     contest" (as such terms are defined or used in Rule 14a-11 under the
     Exchange Act) with respect to the Company or seek to advise, encourage or
     influence any Person or entity with respect to the voting of any Shares; or

                                       9
<PAGE>
 
               (iii)  join any partnership, limited partnership, syndicate or
     other group, otherwise act in concert with any other person for the purpose
     of acquiring, holding, voting or disposing of Shares, or otherwise become a
     "person" within the meaning of Section 13(d)(3) of the Exchange Act (in
     each case other than solely with its Affiliates who are bound by the terms
     of this Agreement).

     Section 6.2 Anti-Dilution Rights. At any time prior to the fifth
anniversary of the Closing Date, the Company covenants and agrees that for so
long as Werfen and any Affiliate of Werfen is the holder of record (each holder,
a "Record Holder") of, in the aggregate, greater than 2 1/2 percent of the then
outstanding Shares (for purposes of determining the number of outstanding Shares
pursuant to this Section, Shares issued after the date hereof in a transaction
in which Werfen or its Affiliates was not given a right to purchase its pro-rata
portion of Shares at the time of such issuance in accordance with Section 6.2,
shall not be considered outstanding), the Record Holder shall have the right to
purchase a pro rata portion of New Equity Securities which the Company, from
time to time, proposes to sell or issue. Such record holder's pro rata portion,
for purposes of this Section 6.2, is the ratio of the number of (x) Shares and
(y) Shares issuable upon the exercise, conversion or exchange of Common Stock
Equivalents which each Record Holder then owns to the total number of (x) Shares
and (y) Shares issuable upon the exercise, conversion or exchange of Common
Stock Equivalents then outstanding. In the event that the Company proposes to
undertake an issuance or sale of New Equity Securities, the Company shall
furnish to each Record Holder written notice (the "Anti-Dilution Rights Notice")
of such proposal, describing the type of New Equity Securities and the price and
the terms upon which the Company proposes to issue or sell the same. For a
period of five Business Days (the "Anti-Dilution Notice Period") following the
delivery of the Anti-Dilution Rights Notice by the Company, the Company shall be
deemed to have irrevocably offered to sell to each Record Holder its pro rata
share of such New Equity Securities for the price and upon the terms specified
in the Anti-Dilution Rights Notice. Each Record Holder may exercise its purchase
rights hereunder by giving written notice to the Company and stating therein the
quantity of New Equity Securities to be purchased (the "Anti-Dilution Shares"),
which quantity shall not exceed such Record Holder's pro rata share. The closing
of the purchase and sale of the Anti-Dilution Shares shall occur concurrently
with (or within two Business Days after) and at the same price and upon the same
terms as the sale or issuance of the other New Equity Securities, which closing
shall occur within ninety Business Days from the expiration of the Anti-Dilution
Notice Period. If no Record Holder exercises its purchase right hereunder, the
Company may sell the New Equity Securities within ninety Business Days of the
expiration of the Anti-Dilution Notice Period, at a price and upon terms no more
favorable to the purchaser thereof than those specified in the Anti-Dilution
Notice.

          In addition, the Company also covenants and agrees that for so long as
Werfen and any Affiliate of Werfen is the holder of record of, in the aggregate,
greater

                                       10
<PAGE>
 
than 2 1/2 percent of the then outstanding Shares (for purposes of determining
the number of outstanding Shares pursuant to this Section, Shares issued after
the date hereof in a transaction in which Werfen or its Affiliates was not given
a right to purchase its pro-rata portion of Shares at the time of such issuance
in accordance with Section 6.2, shall not be considered outstanding), the
Company will use commercially reasonable efforts to permit Werfen and such
Affiliates to participate in any underwritten public offering of Shares to the
extent necessary to enable such Record Holder to purchase at the price sold by
the Company, a pro rata portion of Shares sold in such underwritten public
offering, calculated in accordance with this Section 6.2.

     Section 6.3 Registration Rights; Warrant. The Company covenants and agrees
that, (i) it will use its reasonable efforts to cause prior to January 23, 1998
the Registration Rights Agreement to be amended, in accordance with its terms to
provide that (x) Werfen will become a party to such agreement and (y) the
definition of Restricted Stock shall include the Purchased Shares or (ii) if the
Registration Rights Agreement has not been amended in accordance with subsection
(i) of this Section 6.3, at the Closing, it will issue the Warrant to Werfen.

     Section 6.4 Access. For so long as Werfen and any Affiliate of Werfen is
the holder of record of, in the aggregate, greater than 2 1/2 percent of the
then outstanding Shares (for purposes of determining the number of outstanding
Shares pursuant to this Section, Shares issued after the date hereof in a
transaction in which Werfen or its Affiliates was not given a right to purchase
its pro-rata portion of Shares at the time of such issuance in accordance with
Section 6.2, shall not be considered outstanding), the Company covenants and
agrees that from the date hereof, the Company shall (i) deliver copies to Werfen
of all filings with the Commission made by the Company and (ii) deliver copies
to Werfen of all press releases issued by the Company.

                                  ARTICLE VII

                       CONDITIONS TO WERFEN'S OBLIGATIONS
                       ----------------------------------

     The obligation of Werfen to consummate the transactions contemplated by
this Agreement shall be subject to the satisfaction (or waiver, where
permissible) at or prior to the Closing of all of the following conditions:

     Section 7.1 Representations, Warranties, Covenants, Material Change. The
Company shall have complied with all of their agreements and covenants contained
herein to be performed on or prior to the Closing Date, and all representations
and warranties of the Company contained herein shall be true on and as of the
Closing Date with the same effect as though made on and as of the Closing Date.
Werfen shall have received a certificate executed by an executive officer of the
Company, dated as of the Closing Date, certifying as to the fulfillment of the
conditions set forth in this Section 7.1.

                                       11
<PAGE>
 
     Section 7.2 No Prohibition; Litigation. No statute, rule or regulation or
order of any court or administrative agency shall be in effect which prohibits
the parties from consummating the transactions contemplated hereby and there
shall not be any pending, or threatened by any Person, litigation which might
prohibit the parties from consummating the transactions contemplated hereby.

     Section 7.3 Certificates and Resolutions. Werfen shall have received
copies, in form and substance reasonably satisfactory to it, of such
certificates of good standing, board resolutions, officers and secretaries'
certificates and other documents with respect to the Company as Werfen or its
counsel shall reasonably request.

     Section 7.4 Legal Opinion. Werfen shall have received an opinion from
counsel to the Company (who shall be satisfactory to Werfen), addressed to
Werfen, in form and substance reasonably satisfactory to Werfen, covering the
authorization, execution, delivery and enforceability of this Agreement and the
valid issuance of the Purchased Shares.

     Section 7.5 Due Diligence. The results of Werfen's review of the Company
and its products, business plan, forecasts and financial position are
satisfactory to Werfen, provided, however, that this Section 7.5 shall be deemed
satisfied if Werfen does not give the Company written notice that this Section
7.5 shall not be deemed so satisfied prior to 6:00 p.m., Minneapolis, Minnesota
time, on January 14, 1998.

     Section 7.6 Regulatory Approvals. Werfen shall have received all necessary
governmental consents and approvals for the consummation of the transactions
contemplated by this Agreement.

     Section 7.7 Registration Right; Warrant. The Company shall have (i) amended
the Registration Rights Agreement in accordance with Section 6.3(i) or (ii)
issued the Warrant in accordance with Section 6.3(ii).


                                  ARTICLE VIII

                                  TERMINATION
                                  -----------

     Section 8.1 Termination. This Agreement may be terminated at any time prior
to the Closing,

               (a) by the mutual written consent of the parties hereto; or

               (b) by either Werfen, on the one hand, or the Company, on the
     other hand, if the Closing shall not have occurred on or before January 31,
     1998.

                                       12
<PAGE>
 
     Section 8.2 Effect on Obligations. Termination of this Agreement pursuant
to this Article VIII shall terminate all rights and obligations of the parties
hereunder and none of the parties shall have any liability to the other parties
hereunder, except that Section 9.6 shall remain in effect, and provided that
nothing herein shall relieve any party from liability for any breach of any
covenant or agreement in this Agreement prior to such termination.

                                   ARTICLE IX

                                 MISCELLANEOUS
                                 -------------

     Section 9.1 Survival. All representations and warranties by the parties
herein shall survive the Closing until (and no claim for indemnification in
respect of a breach thereof shall be made following) two Business Days after the
audited financial statements for the fiscal year ended December 31, 1998 have
been filed with the Commission on Form 10-K, except in all cases with respect to
and to the extent of any claims of which written notice specifying, in
reasonable detail (to the extent known), the nature and amount of the claims has
been given by Werfen to the Company, or by the Company to Werfen, as the case
may be, prior to such expiration, which claims shall survive without limitation
as to time. Nothing in this Agreement is intended to impose any time limitations
in connection with covenants or agreements which are not to be performed at or
prior to the Closing.

     Section 9.2 Expenses. Each party hereto shall pay all fees and expenses
incurred by it in connection with this Agreement and the transactions
contemplated hereby, including fees and expenses of its accountants and counsel.

     Section 9.3 Exclusive Agreement; No Third-Party Beneficiaries. This
Agreement and the Reseller Agreement constitute the sole understanding of the
parties with respect to the subject matter hereof and any verbal or written
communication between the parties prior to the adoption of this Agreement shall
be deemed merged herein and of no further force and effect. Notwithstanding
anything contained in this Agreement to the contrary, nothing in this Agreement,
express or implied, is intended to confer on any Person other than the parties
hereto or their respective heirs, successors, executors, administrators and
permitted assigns any rights, remedies, obligations or liabilities under or by
reason of this Agreement.

     Section 9.4 Governing Law, Etc. This Agreement shall be construed in
accordance with and governed by the laws of the State of Delaware applicable to
agreements made and to be performed wholly within such jurisdiction.

     Section 9.5 Successors and Assigns. The terms and conditions of this
Agreement shall inure to the benefit of and be binding upon the respective
successors and  

                                       13
<PAGE>
 
assigns of the parties hereto. This Agreement may not be assigned (by operation
of law or otherwise) by either party without the prior written consent of the
other party, and any such assignment shall be void and of no force or effect;
provided however that Werfen may, at its election, assign all or part of its
rights under this Agreement (including the right to acquire the Purchased
Shares), (i) to any Affiliate of Werfen, (ii) except for the right provided for
in Section 6.2 which may not be assigned pursuant to this clause (ii), with the
consent of the Company, which consent shall not be unreasonably withheld, to any
other Person, or (iii) with the consent of the Company, to any other Person,
provided that such Affiliate or Person becomes a signatory to, and agrees to be
bound by this Agreement but no such assignment of this Agreement or any of the
rights or obligations hereunder shall relieve Werfen of any of its obligations
under this Agreement. In addition, either party may assign this Agreement in
connection with a Change in Control, as defined in the Reseller Agreement, of
such party.

     Section 9.6 Publicity. No public release or announcement concerning the
transactions contemplated hereby or by the Reseller Agreement shall be issued by
any party hereto without the prior consent of the other party hereto (which
consent shall not be unreasonably withheld), except as such release or
announcement may be required by law or the rules or regulations of any United
States or foreign securities exchange, in which case the party required to make
the release or announcement shall give the other party notice in advance of such
issuance. Werfen acknowledges that the Company will file this Agreement with the
Commission.

     Section 9.7 Severability. If any term or other provision of this Agreement
is invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the economic or legal substance of
the transactions contemplated hereby is not affected in any adverse manner to
any party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an acceptable manner so that the transactions
contemplated hereby are fulfilled to the greatest extent possible.

     Section 9.8 Notices. All notices and other communications given hereunder
shall be sent to the parties at the addresses set forth below (or such other
address of which any party will have given written notice to the other party) by
facsimile, overnight air courier, service fee prepaid, or certified or
registered mail, postage prepaid and return receipt requested. Notices so given
shall be effective upon the earlier of: (i) receipt by the party to which notice
is given (which in the case of a facsimile, shall be deemed to have occurred at
the time that the machine transmitting the facsimile verifies a successful
transmission of the facsimile); (ii) on the fifth Business Day following the
date such 

                                       14
<PAGE>
 
notice was deposited in the mail; or (iii) on the second Business Day such
notice was delivered to a commercial air delivery service:

          (a)  If to the Company, to:

               Optical Sensor Incorporated
               7615 Golden Triangle Drive
               Technology Park Drive
               Minneapolis, MN  55344
               Attention:  President and CEO
               Facsimile:  (612) 914-9441

               with a copy to:

               Oppenheimer, Wolff & Donnelly
               3400 Plaza VII
               45 South Seventh Street
               Minneapolis, MN  55402
               Attention:  Thomas A. Letscher
               Facsimile:  (612) 607-7100

          (b)  If to Werfen, to:

               Grupo CH Werfen, S.A.
               Viladomat, 162
               08015 Barcelona
               Spain
               Attention: Jose Luis Martin
               Facsimile:  34(3) 451 37 45

               with a copy to:

               Instrumentation Laboratory Company
               101 Hartwell Avenue
               Lexington, MA  02173
               Attention:  E. Hunterson Henrie, II
               Facsimile:  781 861 4496

               and with a copy to:

               Fried, Frank, Harris, Shriver & Jacobson
               4 Chiswell Street
               London, EC1Y 4UP

                                       15
<PAGE>
 
               England
               Attention:  Timothy E. Peterson
               Facsimile:  011 44 171 972 9602


     Section 9.9 Counterparts; Facsimile Signatures. This Agreement may be
executed in any number of counterparts, each of which shall be deemed to be an
original, but all of which together shall constitute but one and the same
agreement. Delivery of a photocopy or transmission by facsimile of a signed
signature page of this Agreement shall constitute delivery of such signed
signature page.

     Section 9.10 Interpretation. When a reference is made in this Agreement to
Articles, Sections, or an Annex, such reference is to an Article or a Section of
or an Annex to, this Agreement, unless otherwise indicated. The table of
contents and headings contained in this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement. Whenever the words "include," "includes" or "including" are used in
this Agreement, they shall be understood to be followed by the words "without
limitation."

     Section 9.11 Amendment. This Agreement may not be amended except by an
instrument in writing signed on behalf of each of the parties.

     Section 9.12 Extension; Waiver. At any time the parties may extend the time
for the performance of any of the obligations or other acts of the other
parties, waive any inaccuracies in the representations and warranties contained
in this Agreement and waive compliance with any of the agreements or conditions
contained in this Agreement. Any agreement on the part of a party to any such
extension or waiver shall be valid only if set forth in an instrument signed on
behalf of such party. The waiver by any party hereto of a breach of any
provision hereunder shall not operate to be construed as a waiver of any prior
or subsequent breach of the same or any other provision hereunder.

     Section 9.13 Indemnity. The Parties agree to comply with the terms of Annex
A relating to Indemnification.

                                       16
<PAGE>
 
          IN WITNESS WHEREOF, this Agreement has been signed on behalf of each
of the parties hereto as of the date first above written.

                                       OPTICAL SENSORS INCORPORATED

                                       /s/ Sam B. Humphries
                                       ----------------------------------
                                       By:  Sam. B. Humphries

                                       Title:  President and Chief 
                                               Executive Officer

                                       GRUPO CH WERFEN, S.A.
        
                                       /s/ E. Hunterson Henrie, II
                                       ----------------------------------
                                       By:  E. Hunterson Henrie, II
                                       Title:

                                       17
<PAGE>
 
                                                                         ANNEX A

                                    ANNEX A
                                INDEMNIFICATION
                                ---------------

     Section A.1 Losses. For purposes of this Agreement, the terms "Loss" or
"Losses" shall mean each and all of the following items to the extent actually
incurred: claims, losses, liabilities, damages, judgments, fines, penalties,
amounts paid in settlement and reasonable costs and expenses incurred in
connection therewith (including, without limitation, interest which is imposed
in connection therewith, costs and expenses of suits and proceedings, and
reasonable fees and disbursements of counsel).

     Section A.2 Indemnification by the Company. The Company shall indemnify and
hold harmless Werfen, its shareholders and Affiliates, their respective
officers, directors, shareholders, successors and permitted transferees and
assigns from and against any and all Losses based upon, arising out of, or
resulting from, any of the following:

               (i) any breach by the Company of any of the representations or
     warranties made by the Company in this Agreement; or

               (ii) any failure by the Company to perform any of its covenants
     or agreements contained in this Agreement.

     Section A.3 Indemnification by Werfen. Werfen shall indemnify and hold
harmless the Company, its shareholders and Affiliates and their respective
officers, directors, shareholders, successors and permitted transferees and
assigns, from and against any and all Losses based upon or resulting from any of
the following:

               (i) any breach by Werfen of any of the representations or
     warranties made by Werfen in this Agreement; or

               (ii) any failure by Werfen to perform any of its covenants or
     agreements contained in this Agreement.

     Section A.4 Claims. (a) When a party seeking indemnification under Sections
A.2 or A.3 (the "Indemnified Party") receives notice of any claims made by third
parties ("Third Party Claims") or has any other claim for indemnification other
than a Third Party Claim, which is to be the basis for a claim for
indemnification hereunder, the Indemnified Party shall give prompt written
notice thereof to the other party or parties (the "Indemnifying Party")
reasonably indicating (to the extent known) the nature of such claims and the
basis thereof; provided, however, that failure of the Indemnified Party to give
the Indemnifying Party prompt notice as provided herein shall not relieve the
Indemnifying Party of any of its obligations hereunder unless and only to the
extent that the Indemnifying Party shall have been prejudiced thereby. Upon
notice from the Indemnified Party, the Indemnifying Party may, but shall not be
required to, assume the

                                      A-1
<PAGE>
 
defense of any such Third Party Claims, including its compromise or settlement,
and the Indemnifying Party shall pay all reasonable costs and expenses thereof
and shall be fully responsible for the outcome thereof; provided, however, that
in such case, the Indemnifying Party shall have no obligation to pay any further
costs or expenses of legal counsel of the Indemnified Party thereafter incurred
in connection with such defense.  No compromise or settlement in respect of any
Third Party Claims may be effected by the Indemnifying Party without the
Indemnified Party's prior written consent (which consent shall not be
unreasonably withheld or delayed), unless the sole relief is monetary damages
that are paid in full by the Indemnifying Party (and satisfactory releases are
delivered to the Indemnified Party).  The Indemnifying Party shall give notice
to the Indemnified Party as to its intention to assume the defense of any such
Third Party Claims within thirty (30) days after the date of receipt of the
Indemnified Party's notice in respect of such Third Party Claims.  If an
Indemnifying Party does not, within thirty (30) days after the Indemnified
Party's notice is given, give notice to the Indemnified Party of its assumption
of the defense of the Third Party Claims, the Indemnifying Party shall be deemed
to have waived rights to control the defense thereof.  If the Indemnified Party
assumes the defense of any Third Party Claims because of the failure of the
Indemnifying Party to do so in accordance with this Section A.4, it may do so in
such reasonable manner as it may deem appropriate, and the Indemnifying Party
shall pay any judgment entered against the Indemnified Party and all reasonable
costs and expenses of such defense.  The Indemnifying Party shall have no
liability with respect to any compromise or settlement thereof effected without
its prior written consent (which consent shall not be unreasonably withheld or
delayed), unless the sole relief granted was equitable relief for which the
Indemnifying Party would have no liability or to which the Indemnifying Party
would not be subject.

          (b) Notwithstanding the foregoing, with respect to any Third Party
Claim that the Indemnifying Party is defending, the Indemnified Party shall have
the right to retain separate counsel to represent it and the Indemnifying Party
shall pay the reasonable fees and expenses of such separate counsel if there are
conflicts that make it reasonably necessary for separate counsel to represent
the Indemnified Party and the Indemnifying Party.

     Section A.5 Exclusive Remedy. Except as expressly provided otherwise in
this Agreement, following the Closing, (i) the indemnification provisions set
forth in this Annex A shall be the sole and exclusive remedy of the parties
hereto for damages for breaches of representations and warranties and covenants
and other agreements and (ii) if the Registration Rights Agreement is amended in
accordance with Section 6.3(i), the indemnification obligations set forth the
Registration Rights Agreement shall be the sole and exclusive remedy of the
parties hereto with respect to the matters set forth in the Registration Rights
Agreement.

                                      A-2

<PAGE>
 
                                                                    EXHIBIT 99.1
                                                                                
Instrumentation Laboratory Contact:                    Optical Sensors Contact:
Jose Luis Martin, CFO                                  Douglas Ewing
011-34--3-401-0108                                     Swenson Falker Associates
E. Hunterson Henrie, Corporate Finance                 612-371-0000
781-861-0710

                 INSTRUMENTATION LABORATORY AND OPTICAL SENSORS
                              ANNOUNCE PARTNERSHIP
                                        
      - FURTHER STRENGTHENS IL'S POSITION IN THE HOSPITAL POINT-OF-CARE 
                               TESTING MARKET -

Milan, Italy, Lexington, Massachusetts, and Minneapolis, January 7, 1998 -
Instrumentation Laboratory' S.p.A. (IL) (Nasdaq: ILABY) and Optical Sensors,
Inc. (Nasdaq: OPSI) today announced the formation of a seven year partnership to
distribute the OEM(R) SensiCath(R) and GEM(R) OpticalCAM(TM), new members of the
IL GEM(R) family of hospital point-of-care diagnostic products and an addition
to IL's established line of critical care testing products. The partnership is
reflective of IL's aggressive growth strategy aimed at market expansion through
reinforcement of traditional core critical care and hemostasis product lines and
simultaneous creation and expansion of opportunities into the high growth
hospital POC sector.  Independent sources have estimated that the non-glucose
meter hospital POC market reached revenues of $300 million in 1996 and is
expected to reach $800 million by 2001.

The initial launch of the patient-attached, on-demand arterial blood gas (ABG)
monitoring system is expected to occur within the first quarter of 1998,
extending IL's position in the critical care market and strengthening its
position in the hospital POC marketplace.  The addition of the GEM(R)
SensiCath(R) and GEM(R) OpticalCAM(TM) to IL's expanding portfolio of hospital
POC products will enable IL to serve a wider range of hospital POC testing
requests.

The system will be manufactured by Optical Sensors and will measure pH, pCO2 and
pO2 as well as calculate HCO3, BE and SAO2.  IL has exclusive worldwide
distribution rights to SensiCath(R) Sensors and non-exclusive worldwide
distribution rights to the OpticalCAM(TM) ABG instrument.  IL must meet certain
revenue minimums to retain exclusive rights.  The agreement does not affect
Optical Sensors current relationships with manufacturers of monitoring
equipment.  Hewlett-Packard, Marquette, and SpaceLabs will continue to be able
to quote and sell hardware for SensiCath(R) ABG monitoring.

The system will be marketed under a joint IL and Optical Sensors label and sold
as part of IL's growing POC product portfolio.  Optical Sensors will continue to
enhance the development of optical technology and IL will have access to product
improvements, including menu expansion.

John Sperzel, Vice President of IL's Critical Care Business Unit, commented,
"The shared vision between Optical Sensors and IL was a key fact or in our
decision to form this long-term partnership.  Both companies believe in the
value of POC testing, and in particular, believe in the
<PAGE>
 
value of patient-attached ABG monitoring.  By working together, we will be able
to address an extended range of critical care and hospital POC needs.  The
integration of the GEM(R) SensiCath(R) and GEM(R) OpticalCAM(TM) into ILs
laboratory-based critical care product line also serves to reinforce IL's
commitment. to its overall critical care business."

He added, "this partnership exemplifies our commitment to our dual vector growth
strategy which strengthens ILs traditional blood gas and hemostasis business
segments and provides opportunities to expand our presence in the rapidly
growing hospital POC market.  This partnership with Optical Sensors and our
recently announced agreement with International Technidyne Corporation for the
GEM(R) PCL POC coagulation system, have resulted from this approach.  We will
continue to pursue this strategy in an effort to promote IL's market expansion."

Sam Humphries, President. and CEO of Optical Sensors, remarked, "This important
and strategic partnership is a definitive validation of our efforts to develop
the SensiCath(R) technology.  Our platform for patient-attached blood gas
monitoring is unique, adaptable to varied interfaces and key to the broader
application of fiber-optics for both patient monitoring and point-of-care
analysis.  We are tremendously pleased to enter into this partnership with one
of the world's premier developers and distributors of diagnostic
instrumentation, and look forward to a very rewarding future with IL.'

IL has pursued an aggressive investment policy aimed at market expansion through
reinforcement of traditional core product lines and simultaneous creation and
expansion of opportunities into high growth sectors.  In the past year, the
Company has continued to fulfill the goals of its growth strategy through many
substantial achievements:

     -  Acquisition and integration of the Mallinckrodt Sensor Systems GEM(R)
        critical care POC platform into IL's more traditional critical care
        business, broadening IL's critical care platform and providing entry
        into the hospital POC marketplace;

     -  Establishment of a dedicated hospital POC marketing and sales
        organization o support existing and future hospital POC products;

     -  Extension of the traditional laboratory-based critical care systems with
        the introduction of the fully integrated IL Synthesis(TM) family of
        critical care analyzers;

     -  Introduction f a new information management technology, the Impact(TM)
        for Critical Care Information System including the productivity focused
        Manager's Workstation Module for remote supervision of critical care
        analyzers throughout a hospital's centralized and POC sites.

     -  Formation f a ten year partnership with International Technidyne
        Corporation to co-develop and distribute the GEM(R) PCL POC coagulation
        system.

Optical Sensors, a development stage company, has developed the SensiCath(R)
technology, a patient-attached, on-demand arterial blood gas (ABG) monitoring
system, which provides precise, accurate and economical ABG results within 60
seconds without exposure to potentially infectious blood or depleting the
patient's blood supply.  Optical Sensors' OpticalCAM(TM) ABG 

                                       2
<PAGE>
 
monitoring instrumentation, in conjunction with the SensiCath(R) Sensor,
provides a fully integrated system for measuring and monitoring arterial blood
gas. The OpticalCAM(TM) operates either as a stand-alone system or can interface
with other manufacturers' bedside monitoring equipment.

Instrumentation Laboratory is a worldwide developer, manufacturer and
distributor of in vitro diagnostic instruments and related reagents, controls,
other consumables and services for use primarily in hospitals and independent
clinical laboratories.  the Company's product liens include critical care
systems, hemostasis systems and clinical chemistry systems.

Note:  Safe Harbor Statement under the Private Securities Litigation Reform Act
of 1995:  This press release contains forward-looking statements regarding the
Company's results and trends in the business.  These forward-looking statements
are based largely on the Company's expectations and are subject to a number of
risks and uncertainties, many of which are beyond the Company's control.  We
refer you to the factors set forth under the "Cautionary Statements and Risk
Factors" in the Company's Form 20-F.

                                       3

<PAGE>
 
                                                                    EXHIBIT 99.2
                                                                                
FROM:                                   FOR:
Swenson NHB Investor Relations          Optical Sensors Incorporated
121 South Eighth St. Suite 1111         7615 Golden Triangle Drive
Minneapolis, Minn. 33402                Minneapolis, Minn. 33344
Contact: Doug Ewing (612) 371-0000      Contact: Wes Peterson, CFO
                                           (612) 944-5837

FOR IMMEDIATE RELEASE

 GRUPO CH-WERFEN, S.A., MAJORITY SHAREHOLDER OF INSTRUMENTATION LABORATORY, TO
            PURCHASE 441,000 SHARES OF OPTICAL SENSORS COMMON STOCK
                                        
MINNEAPOLIS, Jan. 15 -- Optical Sensors Inc. (Nasdaq: OPSI) said today that,
concurrent with its previously announced worldwide distribution agreement with
Instrumentation Laboratory Company (IL), Optical Sensors entered into an
agreement under which Grupo CH-Werfen, S.A., the majority shareholder of IL's
parent company, will purchase 441,203 shares of Optical Sensors' common stock.

The newly issued shares will be sold at a price of $5.00 per share which is
equal to the closing price of Optical Sensors' common stock on Jan. 6, 1998, the
last closing price prior to the signing of both agreements.  The investment will
represent 4.99 percent of Optical Sensors' common shares outstanding after the
transaction is completed.  All material conditions to the closing have been
satisfied and the parties expect to close the transaction by the end of January.

On Jan. 7, 1998, Optical Sensors announced the formation of a seven-year
partnership with IL under which IL will distribute the GEM(R) SensiCath(R) and
GEM(R) OpticalCAM(TM), new members of the IL GEM(R) family of hospital point-of-
care diagnostic products and an addition to IL's established line of critical
care testing products. The distribution agreement gives IL exclusive worldwide
distribution rights to SensiCath Sensors and nonexclusive worldwide distribution
rights to the OpticalCAM arterial blood gas (ABG) instrumentation.  IL, with
total annual revenues of $260 million, is a leader in diagnostic critical care
and hemostasis products worldwide.

Sam Humphries, president and CEO of Optical Sensors, said, "Our new strategic
partnership with IL - one of the world's premier developers and distributors of
diagnostic instrumentation - is a clear and bold step forward to cover all
segments of the central lab, stat lab and point-of-care (POC) blood gas analyzer
market with one organization, one product line, one market strategy and one
clear source of supply.

"The $2.2 million equity investment by Werfen is highly important to Optical
Sensors for two key reasons," Humphries continued.  "First, the investment is a
tangible expression of confidence in the long-term efficacy of our technology by
the majority shareholder of IL's parent company.
<PAGE>
 
Second, it provides additional balance to our worldwide distribution agreement
with IL, with its majority shareholder now positioned to benefit, as a
shareholder of Optical Sensors, from the long-term success of that strategic
partnership. Additionally, the funds provided by this investment will be helpful
in supporting our planned ramp-up in production of the SensiCath Sensor and
OpticalCAM instrumentation. We are very excited and pleased with the decision of
Werfen to become an equity investor in Optical Sensors."

Grupo CH-Werfen, S.A., based in Barcelona, Spain, is the majority shareholder of
Instrumentation Laboratory S.p.A. (Nasdaq: ILABY) of which IL is a wholly owned
subsidiary.  Instrumentation Laboratory is a worldwide developer, manufacturer
and distributor of in vitro diagnostic instruments and related reagents,
controls, other consumables and services for use primarily in hospitals and
independent clinical laboratories.  IL's product lines include critical care
systems, hemostasis systems and clinical chemistry systems.

Optical Sensors, a development stage company, has developed the SensiCath(R)
technology, a patient-attached, on-demand arterial blood gas (ABG) monitoring
system, which provides precise, accurate and economical ABG results within 60
seconds without exposure to potentially infectious blood or depleting the
patient's blood supply.  Optical Sensors' Optical CAM(TM) ABG monitoring
instrumentation, in conjunction with the SensiCath Sensor, provides a fully
integrated system for measuring and monitoring arterial blood gas.  The
OpticalCAM operates either as a stand-alone system or can interface with other
manufacturers' bedside monitoring equipment.  For more information, please visit
Optical Sensors' website at http://www.medicom.com/opsi.

                                       2

<PAGE>
 
                                                                    EXHIBIT 99.3
                                                                                
FROM:                                   FOR:
Swenson NHB Investor Relations          Optical Sensors Incorporated
121 South Eighth St. Suite 1111         7615 Golden Triangle Drive
Minneapolis, Minn. 55402                Minneapolis, Minn. 55344
Contact: Doug Ewing (612) 371-0000      Contact: Wes Peterson, CFO
                                           (612) 944-5857

                                                    Instrumentation Laboratory
                                                    Contact:E. Hunterson Henrie,
                                                    Corporate Finance
                                                    (781) 861-0710

FOR IMMEDIATE RELEASE

               INSTRUMENTATION LABORATORY BECOMES SHAREHOLDER OF
                 441,000 SHARES OF OPTICAL SENSORS COMMON STOCK
                                        
MINNEAPOLIS, Jan. 27 -- Optical Sensors Inc. (Nasdaq: OPSI) said today that it
has completed its previously announced agreement to sell 441,203 shares of
Optical Sensors' common stock at $5.00 per share. The shares, amounting to 4.99
percent of Optical Sensors' shares outstanding, have been purchased by
Instrumentation Laboratory Company (IL), a wholly owned subsidiary of
Instrumentation Laboratory S .p.A., (Nasdaq: ILABY) and a worldwide leader in
diagnostic critical care and hemostasis products with annual revenues of $260
million,

Sam Humphries, president and CEO of Optical Sensors, said, "We are very pleased
to have finalized this equity investment in Optical Sensors by our new strategic
partner. It is a meaningful expression of IL's confidence in our technology and
their optimism about the long-term benefits of our alliance. Our partnership
with IL is the first of its kind and a decisive response to the market's
movement toward point-of-care technologies. We are taking a clear and bold step
forward to cover all segments of the central lab, stat lab and point-of-care
blood gas analyzer market with one organization, one product line, one market
strategy and one clear source of supply."

On Jan. 15, Optical Sensors announced the agreement with Grupo CH-Werfen, S.A.,
the majority shareholder of Instrumentation Laboratory S.p.A., for the sale of
the shares.

Earlier this month, Optical Sensors formed a seven-year partnership with IL,
under which IL will distribute the OEM(R) SensiCath(R) and GEM(R)
OpticalCAM(TM), new members of the IL GEM(R) family of hospital point-of-care
(POC) diagnostic products and an addition to IL's established line of critical
care testing products. The partnership gives IL exclusive worldwide distribution
rights to SensiCath Sensors and non-exclusive worldwide distribution rights to
the OpticalCAM arterial blood gas (ABG) instrumentation. The initial launch of
this patient-connected member of the IL product line is expected to occur within
the first quarter of 1998.
<PAGE>
 
This partnership with Optical Sensors reflects IL's aggressive growth strategy
aimed at market expansion through reinforcement of traditional core critical
care and hemostasis product lines and simultaneous creation and expansion of
opportunities into the high growth hospital POC sector.

Instrumentation Laboratory is a worldwide developer, manufacturer and
distributor of in vitro diagnostic instruments and related reagents, controls,
other consumables and services for use primarily in hospitals and independent
clinical laboratories.  The Company's product lines include critical care
systems, hemostasis systems and clinical chemistry systems.

Optical Sensors, a development stage company, has developed the SensiCath(R)
technology, a patient-connected, on-demand arterial blood gas (ABG) monitoring
system, which provides precise, accurate and economical ABG results within 60
seconds without exposure to potentially infectious blood or depleting the
patient's blood supply. Optical Sensors' OpticalCAM  ABG monitoring
instrumentation, in conjunction with the SensiCath Sensor, provides a fully
integrated system for measuring and monitoring arterial blood gas.  The
OpticalCAM operates either as a stand-alone system or can interface with other
manufacturers' bedside monitoring equipment. For more information, please visit
Optical Sensors' website at http://www.medicom.com/opsi.

                                       2


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