Document:

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                                                                   EXHIBIT 10.57

                          TRADEMARK SECURITY AGREEMENT

                                                             Seattle, Washington

        THIS TRADEMARK SECURITY AGREEMENT ("Trademark Security Agreement") is
made and entered into as of the 16th day of January, 2002 between SPACELABS
MEDICAL, INC., a Delaware corporation ("Spacelabs Delaware"), SPACELABS MEDICAL,
INC., a California corporation, SPACELABS BURDICK, INC., a Delaware corporation,
VITA-STAT MEDICAL SERVICES, INC., a Florida corporation, LIFECLINIC MEDICAL DATA
CORPORATION, a Washington corporation, and LIFECLINIC.COM CORPORATION, a
Washington corporation (collectively, "Borrowers"), having a mailing address at
15520 N.E. 40th Street, Redmond, Washington 98073, Attention: James A. Richman,
SPACELABS PRODUITS MEDICAUX LTEE., a Quebec company ("Guarantor"), and BANK OF
AMERICA, N.A., a national banking association ("Lender"), having a mailing
address at 55 South Lake, Suite 900, Pasadena, California 91101, Attention:
Michael R. Williamson. Borrowers and Guarantor are collectively referred to
herein as "Assignor".

        BACKGROUND. Borrowers and Lender have entered into that certain Credit
Agreement dated the same date as this Trademark Security Agreement in connection
with a credit facility in the aggregate principal amount of $20,000,000 (as
amended from time to time, the "Credit Agreement"). Pursuant to the terms of the
Credit Agreement and the other documents executed in connection therewith
(collectively, the "Loan Documents"), the Lender has agreed to make loans and
issue letters of credit on behalf of the Borrowers. Pursuant to that certain
Guaranty dated as of the date hereof as amended, restated, supplemented or
otherwise modified from time to time (the "Guaranty"), the Guarantor has agreed
to guaranty the Obligations of Spacelabs Burdick, Inc. under the Credit
Agreement and to provide to the Lender security for the performance of its
Guaranty. In order to induce the Lender to execute and deliver the Credit
Agreement and the other Loan Documents, and as security for the performance by
the Guarantor of its obligations under the Guaranty, Assignor has agreed to
execute and deliver this Trademark Security Agreement to Lender for filing with
the U.S. Patent and Trademark Office and with any other relevant recording
systems in the jurisdictions of the United States and Canada, and as further
evidence of and to effectuate Lender's existing security interests in the
trademarks described herein. This Trademark Security Agreement is being executed
contemporaneously with a Security Agreement ("Security Agreement") under which
the Lender is granted a lien on and security interest in all trademarks owned by
the Assignor (defined in Section 1 below), and in items including but not
limited to machinery, equipment formulations, manufacturing procedures, quality
control procedures and product specifications ("Other Assets") sold under the
Trademarks or relating to products sold under the Trademarks, whereby Lender
shall have the right to foreclose on the Trademarks and the Other Assets in the
event of the occurrence and continuance of an Event of Default under the Loan
Documents (as defined in the Credit Agreement).

        NOW, THEREFORE, in consideration of the premises, Assignor hereby agrees
with the Lender as follows:

1.      To secure the complete and timely satisfaction of all Obligations (as
        defined in the Credit Agreement), Assignor hereby grants, assigns and
        conveys to the Lender a continuing security interest with respect to the
        entire right, title and interest in and to the trademark applications
        and trademarks listed in Schedule A hereto (as the same may be amended
        pursuant hereto from time to time), including without limitation all
        renewals thereof, all proceeds of infringement suits), the right to sue
        for past, present and future infringements and all rights corresponding
        thereto throughout the world (all of the foregoing are collectively
        called the "Trademarks"), and the good

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        will of the business to which each of the Trademarks relates. During the
        continuation of an Event of Default under the Credit Agreement, the
        Assignor shall transfer to the Lender the Trademarks pursuant to an
        Assignment of Trademarks substantially in the form of Schedule B hereto,
        and thereafter the Lender shall be entitled to further transfer such
        Trademarks. The Assignor hereby irrevocably authorizes the Lender to
        date undated Assignments of Trademarks and otherwise complete such
        Assignments, and after doing so, the Lender shall provide a copy of such
        completed Assignments to the Assignor. Notwithstanding the foregoing
        provisions of this Section 1, the Lender acquires no security interest
        or other rights in the United States for any Trademark that is the
        subject of an intent-to-use application before the U.S. Patent and
        Trademark office until such time as a verified amendment to allege use
        or statement of use is filed for such application or the Lender arranges
        for an assignment of such Trademarks from the Lender to a purchaser that
        would satisfy the requirements of Section 10 of the Lanham Act, 15
        U.S.C. Section 1060. At the time that Lender seeks to transfer all other
        Trademarks pursuant to Schedule B, it may also complete Schedule C with
        respect to any U.S. intent-to-use applications and, provided that
        Schedule C satisfies the conditions of the preceding sentence, Assignor
        agrees that it will promptly execute and return the same to Lender.
        Assignor at its expense shall execute and deliver, or cause to be
        executed and delivered, to Lender any and all documents and instruments,
        in form and substance reasonably satisfactory to Lender, and take any
        and all actions, which Lender may reasonably request from time to time,
        to perfect and continue perfected, maintain the priority of or provide
        notice of Lender's security interest in the Trademarks and to accomplish
        the purposes of this Trademark Security Agreement.

2.      In addition to the above mentioned assignment, Guarantor hereby grants
        to the Lender, as security for its obligations under the Guaranty, a
        first ranking movable hypothec under the Civil Code of Quebec in the
        principal amount of Forty Million Canadian Dollars (CDN$40,000,000) with
        interest thereon at the rate of twenty percent (20%) per annum affecting
        the universality of all present and future rights, title and interest
        Guarantor may hold, now or in the future, in the Trademarks. If, for the
        purpose of obtaining a judgment in any court, it is necessary to convert
        the sum due to the Lender in any currency into Canadian currency,
        Guarantor and the Lender agree, to the fullest extent that they may
        effectively do so, that the rate of exchange used shall be that at
        which, in accordance with normal banking procedure, such Lender could
        purchase the original currency with the Canadian currency on the
        business day preceding the day on which final judgment is given or if
        permitted by applicable law, on the day on which the judgment is paid or
        satisfied.

3.      Assignor covenants and warrants that:

        (a)    The Trademarks are subsisting and have not been adjudged invalid
               or unenforceable;

        (b)    To the best of Assignor's knowledge, each of the Trademarks is
               valid and enforceable;

        (c)    No written claim has been made to Assignor that the use of any of
               the Trademarks violates or may violate the rights of any third
               person;

        (d)    Assignor is the sole and exclusive owner of the entire and
               unencumbered right, title and interest in and to each of the
               Trademarks, free and clear of any liens, charges and
               encumbrances, including without limitation pledges, assignments,
               licenses, registered user agreements and covenants by Assignor
               not to sue third persons unless Assignor has

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               entered into a commercially reasonable arrangement for
               co-existence of potentially conflicting marks;

        (e)    Assignor has marked with an asterisk each U.S. intent-to-use
               trademark application listed on Schedule A for which a verified
               amendment to allege use or statement of use has not been filed;

        (f)    Assignor has the unqualified right to enter into this Trademark
               Security Agreement and perform its terms;

        (g)    Assignor has not used, and will not use for the duration of this
               Trademark Security Agreement, improper statutory notice in
               connection with its use of the Trademarks; and

        (h)    Assignor has used, and will continue to use for the duration of
               this Trademark Security Agreement, commercially reasonable
               standards of quality in its manufacture of products sold under
               the Trademarks.

4.      Assignor hereby grants to the Lender and its employees and agents the
        right to visit Assignor's plants and facilities which manufacture,
        inspect or store products sold under any of the Trademarks, and to
        inspect the products and quality control records relating thereto at
        reasonable times during regular business hours. Assignor shall do any
        and all acts reasonably required by Lender to ensure Assignor's
        compliance with Section 3(h).

5.      Assignor agrees that, until all of the Obligations shall have been
        satisfied in full, it will not enter into any agreement (for example, an
        exclusive license agreement) which is inconsistent with Assignor's
        obligations under this Trademark Security Agreement, without the
        Lender's prior written consent, which consent shall not be unreasonably
        withheld. Anything in the Credit Agreement or this Trademark Security
        Agreement to the contrary notwithstanding, Assignor may grant
        non-exclusive licenses of the Trademarks (subject to the security
        interest of Lender therein) in the ordinary course of business
        consistent with past practice. Assignor shall ensure that Lender, or any
        third party to which Lender may transfer the Trademarks pursuant to the
        terms of this Trademark Security Agreement, may be substituted under
        such licenses as the licensor following and during the continuation of
        an Event of Default.

6.      If, before the Obligations shall have been satisfied in full, Assignor
        shall obtain rights to any new registered trademarks or applications for
        the registrations of any new trademark, the provisions of Section 1
        shall automatically apply thereto and Assignor shall give the Lender
        prompt written notice thereof.

7.      Assignor authorizes the Lender to modify this Trademark Security
        Agreement by amending Schedule A to include any future trademarks and
        trademark applications covered by Section 1 and Section 6 hereof.

8.      In the event Lender elects to realize on the Trademarks following an
        Event of Default (as defined in the Credit Agreement), the Lender shall
        grant to Assignor the exclusive, nontransferable right and license to
        use the Trademarks on and in connection with products sold by Assignor,
        for Assignor's own benefit and account and for none other which license
        shall be terminable immediately upon written notice to Assignor, as set
        forth in Section 9. Assignor agrees not to sell

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        or assign its interest in, or grant any sublicense under, the license
        granted to Assignor in this Section 8, without the prior written consent
        of the Lender.

9.      If any Event of Default shall have occurred and be continuing, the
        Lender shall have the right to terminate Assignor's license under the
        Trademarks, as set forth in Section 8, upon giving notice to Assignor,
        and following such license termination, the Lender shall have, in
        addition to all other rights and remedies given it by this Agreement,
        those allowed by law and the rights and remedies of a secured party
        under the Uniform Commercial Code as enacted in any jurisdiction in
        which the Trademarks may be located and, without limiting the generality
        of the foregoing, the Lender may immediately, without demand of
        performance and without other notice (except as set forth next below) or
        demand whatsoever to Assignor, all of which are hereby expressly waived,
        and without advertisement, sell at public or private sale or otherwise
        realize upon, in King County, Washington, or elsewhere, all or from time
        to time any of the Trademarks, or any interest which the Assignor may
        have therein, and after deducting from the proceeds of sale or other
        disposition of the Trademarks all expenses (including all reasonable
        expenses for broker's fees and legal services), shall apply the residue
        of such proceeds after payment of the Obligations. Any remainder of the
        proceeds after payment in full of the Obligations shall be paid over to
        Assignor. Notice of any sale or other disposition of the Trademarks
        shall be given to Assignor at least ten (10) days before the time of any
        intended public or private sale or other disposition of the Trademarks
        is to be made, which Assignor hereby agrees shall be reasonable notice
        of such sale or other disposition, and during which time Assignor may
        cure such Event of Default, in which event Lender's rights to dispose of
        the Trademarks because of such Event of Default shall terminate. At any
        such sale or other disposition, Lender may, to the extent permissible
        under applicable law, purchase the whole or any part of the Trademarks
        sold, free from any right of redemption on the part of Assignor, which
        right is hereby waived and released.

10.     At such time as Assignor shall completely satisfy all of the
        Obligations, this Trademark Security Agreement shall terminate and the
        Lender shall execute and deliver to Assignor all deeds, assignments and
        other instruments as may be necessary or proper to re-vest in Assignor
        full title to the Trademarks, subject to any disposition thereof which
        may have been made by Lender pursuant hereto.

11.     Any and all fees, costs and expenses, of whatever kind or nature,
        including the reasonable attorney's fees and legal expenses incurred by
        Lender in connection with the preparation of this Trademark Security
        Agreement and all other documents relating hereto and the consummation
        of this transaction, the filing or recording of any documents (including
        all taxes in connection therewith) in public offices, the payment or
        discharge of any taxes, counsel fees, maintenance fees, encumbrances or
        otherwise protecting, maintaining or preserving the Trademarks, or in
        defending or prosecuting any actions or proceedings arising out of or
        related to the Trademarks, shall be borne and paid by Assignor on demand
        by the Lender and if not so paid shall be added to the principal amount
        of the Obligations and shall bear interest at the rate effective under
        the Credit Agreement.

12.     Assignor shall have the duty, through counsel reasonably acceptable to
        the Lender, to prosecute diligently any trademark applications of the
        Trademarks pending as of the date of this Trademark Security Agreement
        or thereafter, which Assignor reasonably determines are necessary or
        desirable for the conduct of business, until the Obligations shall have
        been paid in full, to file and prosecute opposition and cancellation
        proceedings and to do any and all acts which in Assignor's reasonable
        determination are necessary or desirable to preserve and maintain all
        rights in the

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        Trademarks. Any expenses incurred in connection with the Trademarks
        shall be borne by Assignor. Assignor shall not abandon any material
        Trademark without the consent of the Lender, which consent shall not be
        unreasonably withheld, but in all instances Assignor shall give the
        Lender not less than ten (10) days prior written notice of its intent to
        abandon any Trademark.

13.     Assignor shall have the right, with the prior written consent of the
        Lender, which will not be unreasonably withheld, to bring any opposition
        proceedings, cancellation proceedings or lawsuit in its own name to
        enforce or protect the Trademarks, in which event the Lender may, if
        necessary, be joined as a nominal party to such suit if the Lender shall
        have been satisfied that it is not thereby incurring any risk of
        liability because of such joinder. Assignor shall promptly, upon demand,
        reimburse and indemnify the Lender for all damages, costs and expenses,
        including reasonable attorneys' fees and costs, incurred by the Lender
        in the fulfillment of the provisions of this Section 13.

14.     In the event of the occurrence and during the continuation of an Event
        of Default under the Credit Agreement, Assignor hereby authorizes and
        empowers Lender to make, constitute and appoint any officer or agent of
        Lender as Lender may select, in its exclusive discretion, as Assignor's
        true and lawful attorney-in-fact, with the power to endorse Assignor's
        name on all applications, documents, papers and instruments necessary
        for Lender to use the Trademarks, or to grant or issue any exclusive or
        nonexclusive license under the Trademarks to anyone else, subject to any
        license to Assignor which has not been terminated by the Lender, or
        reasonably necessary for Lender to assign, pledge, convey or otherwise
        transfer title in or dispose of the Trademarks to anyone else. Assignor
        hereby ratifies all that such attorney shall lawfully do or cause to be
        done by virtue hereof. This power of attorney shall be irrevocable for
        the life of this Trademark Security Agreement.

15.     If Assignor fails to comply with any of its obligations hereunder,
        Lender may do so in Assignor's name or in Lender's name, but at
        Assignor's expense, and Assignor hereby agrees to reimburse Lender in
        full for all reasonable expenses, including reasonable attorney's fees,
        incurred by the Lender in protecting, defending and maintaining the
        Trademarks.

16.     No course of dealing between Assignor and the Lender, nor any failure to
        exercise, nor any delay in exercising, on the part of the Lender, any
        right, power or privilege hereunder or under the Credit Agreement or the
        other Loan Documents shall operate as a waiver thereof; nor shall any
        single or partial exercise of any right, power or privilege hereunder or
        thereunder preclude any other or further exercise thereof or the
        exercise of any other right, power or privilege.

17.     All of the Lender's rights and remedies with respect to the Trademarks,
        whether established hereby or by the Credit Agreement or the other Loan
        Documents, or by any other agreements or by law, shall be cumulative and
        may be exercised singularly or concurrently.

18.     The provisions of this Trademark Security Agreement are severable, and
        if any clause or provision shall be held invalid and unenforceable in
        whole or in part in any jurisdiction, then such invalidity or
        unenforceability shall affect only such clause or provision, or part
        thereof, in such jurisdiction, and shall not in any manner affect such
        clause or provision in any other jurisdiction, or any other clause or
        provision of this Trademark Security Agreement in any jurisdiction. This
        Trademark Security Agreement is to be read, construed and applied
        together with the Security Agreement, the Credit Agreement and the other
        Loan Documents which, taken together, set forth

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        the complete understanding and agreement of the Lender and Assignor with
        respect to the matters referred to herein and therein.

19.     This Trademark Security Agreement is subject to modification only by a
        writing signed by the parties, except as provided in Section 7.

20.     The benefits and burdens of this Trademark Security Agreement shall
        inure to the benefit of and be binding upon the respective successors
        and permitted assigns of the parties.

21.     WITH THE EXCEPTION OF THE MOVABLE HYPOTHEC GRANTED BY GUARANTOR PURSUANT
        TO SECTION 2 HEREOF AND THE HYPOTHECARY RECOURSES ARISING THEREFROM
        WHICH SHALL BE GOVERNED BY AND CONSTRUED ACCORDING TO THE LAWS OF THE
        PROVINCE OF QUEBEC, THIS TRADEMARK SECURITY AGREEMENT SHALL BE
        INTERPRETED AND THE RIGHTS AND LIABILITIES OF THE PARTIES HERETO
        DETERMINED IN ACCORDANCE WITH THE INTERNAL LAWS (AS OPPOSED TO THE
        CONFLICT OF LAWS PROVISIONS PROVIDED THAT PERFECTION ISSUES WITH RESPECT
        TO ARTICLE 9 OF THE UCC MAY GIVE EFFECT TO APPLICABLE CHOICE OR CONFLICT
        OF LAW RULES SET FORTH IN ARTICLE 9 OF THE UCC) OF THE STATE OF
        WASHINGTON; PROVIDED THAT THE LENDER SHALL RETAIN ALL RIGHTS ARISING
        UNDER FEDERAL LAW.

        SAVE AND EXCEPT FOR ANY HYPOTHECARY RECOURSE IN THE PROVINCE OF QUEBEC
        AGAINST GUARANTOR WHICH SHALL BE UNDER THE JURISDICTION OF THE COURTS OF
        THE PROVINCE OF QUEBEC, ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO
        THIS TRADEMARK SECURITY AGREEMENT OR ANY OTHER LOAN DOCUMENT MAY BE
        BROUGHT IN THE COURTS OF THE STATE OF WASHINGTON OR OF THE UNITED STATES
        OF AMERICA LOCATED IN KING COUNTY, WASHINGTON, AND BY EXECUTION AND
        DELIVERY OF THIS TRADEMARK SECURITY AGREEMENT, EACH OF THE ASSIGNORS AND
        THE LENDER CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO THE
        NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH OF THE ASSIGNORS AND
        THE LENDER IRREVOCABLY WAIVES ANY OBJECTION, INCLUDING ANY OBJECTION TO
        THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS,
        WHICH IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR
        PROCEEDING IN SUCH COURTS IN RESPECT OF THIS TRADEMARK SECURITY
        AGREEMENT OR ANY DOCUMENT RELATED HERETO. NOTWITHSTANDING THE FOREGOING:
        (1) THE LENDER SHALL HAVE THE RIGHT TO BRING ANY ACTION OR PROCEEDING
        AGAINST THE ASSIGNORS OR THEIR PROPERTY IN THE COURTS OF ANY OTHER
        JURISDICTION THE LENDER DEEMS NECESSARY OR APPROPRIATE IN ORDER TO
        REALIZE ON THE COLLATERAL OR OTHER SECURITY FOR THE OBLIGATIONS AND (2)
        EACH OF THE PARTIES HERETO ACKNOWLEDGES THAT ANY APPEALS FROM THE COURTS
        DESCRIBED IN THE IMMEDIATELY PRECEDING SENTENCE MAY HAVE TO BE HEARD BY
        A COURT LOCATED OUTSIDE THOSE JURISDICTIONS.

        THE ASSIGNORS HEREBY WAIVE PERSONAL SERVICE OF ANY AND ALL PROCESS UPON
        THEM AND CONSENT THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY
        REGISTERED MAIL (RETURN RECEIPT REQUESTED) DIRECTED TO THE ASSIGNORS AT
        THEIR ADDRESSES SET FORTH IN SECTION 12.8 OF THE CREDIT

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        AGREEMENT AND SERVICE SO MADE SHALL BE DEEMED TO BE COMPLETED FIVE (5)
        DAYS AFTER THE SAME SHALL HAVE BEEN SO DEPOSITED IN THE U.S. MAIL
        POSTAGE PREPAID. NOTHING CONTAINED HEREIN SHALL AFFECT THE RIGHT OF THE
        LENDER TO SERVE LEGAL PROCESS BY ANY OTHER MANNER PERMITTED BY LAW.

22.     ASSIGNORS AND THE LENDER EACH IRREVOCABLY WAIVE THEIR RESPECTIVE RIGHTS
        TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
        OUT OF OR RELATED TO THIS TRADEMARK SECURITY AGREEMENT, THE OTHER LOAN
        DOCUMENTS, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY, IN ANY
        ACTION, PROCEEDING OR OTHER LITIGATION OF ANY TYPE BROUGHT BY ANY OF THE
        PARTIES AGAINST ANY OTHER PARTY OR ANY LENDER-RELATED PERSON OR
        PARTICIPANT, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS, OR
        OTHERWISE. THE ASSIGNORS AND THE LENDER EACH AGREE THAT ANY SUCH CLAIM
        OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY.
        WITHOUT LIMITING THE FOREGOING, THE PARTIES FURTHER AGREE THAT THEIR
        RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS
        SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS,
        IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THE
        CREDIT AGREEMENT, THIS TRADEMARK SECURITY AGREEMENT OR THE OTHER LOAN
        DOCUMENTS OR ANY PROVISION HEREOF OR THEREOF. THIS WAIVER SHALL APPLY TO
        ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THE
        CREDIT AGREEMENT, THIS TRADEMARK SECURITY AGREEMENT AND THE OTHER LOAN
        DOCUMENTS.

                         [SIGNATURES ON FOLLOWING PAGE]

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<PAGE>

        IN WITNESS WHEREOF, each of the parties hereto has caused this Trademark
Security Agreement to be executed and delivered by its duly authorized officer
as of the date first set forth above.

BORROWERS:

SPACELABS MEDICAL, INC.,                    VITA-STAT MEDICAL SERVICES, INC.,
a Delaware corporation                                    a Florida corporation

By:                                         By:
   ---------------------------------           ---------------------------------
   Its:                                        Its:
       -----------------------------               -----------------------------

SPACELABS MEDICAL, INC.,                    LIFECLINIC MEDICAL DATA
a California corporation                    CORPORATION, a Washington

By:                                         By:
   ---------------------------------           ---------------------------------
   Its:                                        Its:
       -----------------------------               -----------------------------

SPACELABS BURDICK, INC.,                    LIFECLINIC.COM CORPORATION,
a Delaware corporation                      a Washington corporation

By:                                         By:
   ---------------------------------           ---------------------------------
   Its:                                        Its:
       -----------------------------               -----------------------------

GUARANTOR:

SPACELABS PRODUITS MEDICAUX
LTEE., a Quebec company

By:
   ---------------------------------
   Its:
       -----------------------------

LENDER:

BANK OF AMERICA, N.A.,
a national banking association

By:
   ---------------------------------
   Its:
       -----------------------------

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                                   SCHEDULE B

                                       TO

                          TRADEMARK SECURITY AGREEMENT

                              TRADEMARK ASSIGNMENT

        THIS TRADEMARK ASSIGNMENT ("Assignment ") is made and entered into as of
the ___ day of ________, 200__ between SPACELABS MEDICAL, INC., a California
corporation ("Assignor"), having a mailing address at 15520 N.E. 40th Street,
Redmond, Washington 98073, and BANK OF AMERICA, N.A., a national banking
association ("Assignee"), having a mailing address at 55 South Lake, Suite 900,
Pasadena, California 91101.

        WHEREAS, Assignor has adopted and owns certain trademarks which are
registered in the U.S. Patent and Trademark Office or which are the subject of
pending use-based applications in the U.S. Patent and Trademark Office
(hereinafter the "Marks") and,

        WHEREAS, the Assignee is desirous of acquiring the Marks and
registration therefor.

        NOW THEREFORE, in consideration of and in exchange for good and valuable
consideration, the receipt of which is hereby acknowledged, Assignor does hereby
sell, assign and transfer unto Assignee, and its successors and assigns, all of
its right, title and interest in an to the Marks, and the registrations and
applications therefore, together with that part of the good will of the business
connected with the use of and symbolized by the Marks, and including Assignor's
entire right, title and interest in and to any and all causes of action and
rights of recovery for past infringement of the Marks. Assignor hereby covenants
that is has full right to convey the entire interest herein assigned, and that
it has not executed, and will not execute, any agreements inconsistent herewith.
Assignor hereby irrevocably authorizes Assignee to date this undated Assignment
and otherwise complete this Assignment at the time of transfer.

        IN WITNESS WHEREOF, the parties have executed this Assignment as of the
dates identified above.

ASSIGNOR:

SPACELABS MEDICAL, INC.,
a California corporation

By:
   ---------------------------------------
Its:
    --------------------------------------

ASSIGNEE:

BANK OF AMERICA, N.A.,
a national banking association

By:
   ---------------------------------------
Its:
    --------------------------------------

                              Schedule B - Page 1
<PAGE>

                                   SCHEDULE C
                                       TO
                          TRADEMARK SECURITY AGREEMENT

                              TRADEMARK ASSIGNMENT

        THIS TRADEMARK ASSIGNMENT ("Assignment") is made and entered into as of
the ___ day of _________, 200__ between SPACELABS MEDICAL, INC., a California
corporation ("Assignor"), having a mailing address at 15520 N.E. 40th Street,
Redmond, Washington 98073, and BANK OF AMERICA, N.A., a national banking
association ("Assignee"), having a mailing address at 55 South Lake, Suite 900,
Pasadena, California 91101.

        WHEREAS, Assignor has adopted and owns certain trademarks which are the
subject of pending intent-to-use applications in the U.S. Patent and Trademark
Office (hereinafter the "Marks") and,

        WHEREAS, the Assignee is desirous of acquiring the Marks and
registration therefor.

        NOW THEREFORE, in consideration of and in exchange for good and valuable
consideration, the receipt of which is hereby acknowledged, Assignor does hereby
sell, assign and transfer unto Assignee, and its successors and assigns, all of
its right, title and interest in an to the Marks, and the applications therefor,
together with that part of the good will of the business connected with the use
of and symbolized by the Marks, and including Assignor's entire right, title and
interest in and to any and all causes of action and rights of recovery for past
infringement of the Marks. Assignor hereby covenants that is has full right to
convey the entire interest herein assigned, and that it has not executed, and
will not execute, any agreements inconsistent herewith. As indicated below, each
Mark is the subject of a verified allegation of use under Section 1(c) or 1(d)
of the Lanham Act that has been filed with the U.S. Patent and Trademark Office,
or it is being assigned as part of a transfer of the entire business or portion
thereof to which the marks pertain as required by Section 10 of the Lanham Act.

        IN WITNESS WHEREOF, the parties have executed this Assignment as of the
dates identified above.

ASSIGNOR:

SPACELABS MEDICAL, INC.,
a California corporation

By:
   ---------------------------------------
Its:
    --------------------------------------

ASSIGNEE:

BANK OF AMERICA, N.A.,
a national banking association

By:
   ---------------------------------------
Its:
    --------------------------------------

                              Schedule C - Page 1

                                       10
<PAGE>

                              Schedule A - Page 1<PAGE>

                                                                   EXHIBIT 10.58

                     PATENT COLLATERAL ASSIGNMENT AGREEMENT

                                                             Seattle, Washington

        THIS PATENT COLLATERAL ASSIGNMENT AGREEMENT ("Patent Assignment") is
made and entered into as of the 16th day of January, 2002 between SPACELABS
MEDICAL, INC., a Delaware corporation ("Spacelabs Delaware"), SPACELABS MEDICAL,
INC., a California corporation, SPACELABS BURDICK, INC., a Delaware corporation,
VITA-STAT MEDICAL SERVICES, INC., a Florida corporation, LIFECLINIC MEDICAL DATA
CORPORATION, a Washington corporation, and LIFECLINIC.COM CORPORATION, a
Washington corporation (collectively, "Borrowers"), having a mailing address at
15520 N.E. 40th Street, Redmond, Washington 98073, Attention: James A. Richman,
SPACELABS PRODUITS MEDICAUX LTEE., a Quebec company ("Guarantor"), and BANK OF
AMERICA, N.A., a national banking association ("Lender"), having a mailing
address at 55 South Lake, Suite 900, Pasadena, California 91101, Attention:
Michael R. Williamson. Borrowers and Guarantor are collectively referred to
herein as "Assignor".

        BACKGROUND. Borrowers and Lender have entered into that certain Credit
Agreement dated the same date as this Patent Assignment in connection with a
credit facility in the aggregate principal amount of $20,000,000 (as amended
from time to time, the "Credit Agreement"). Pursuant to the terms of the Credit
Agreement and the other documents executed in connection therewith
(collectively, the "Loan Documents"), the Lender has agreed to make loans and
issue letters of credit on behalf of the Borrowers. Pursuant to that certain
Guaranty dated as of the date hereof as amended, restated, supplemented or
otherwise modified from time to time (the "Guaranty"), the Guarantor has agreed
to guaranty the Obligations (as defined in the Credit Agreement) of Spacelabs
Burdick, Inc. under the Credit Agreement and to provide to the Lender security
for the performance of its Guaranty. In order to induce the Lender to execute
and deliver the Credit Agreement and the other Loan Documents, and as security
for the performance by the Guarantor of its obligations under the Guaranty,
Assignor has agreed to assign to Lender certain patent rights. This Patent
Assignment is being executed contemporaneously with a Security Agreement
("Security Agreement") under which the Lender is granted a lien on and security
interest in all patents owned by the Assignor (the "Patents"), whereby Lender
shall have the right to foreclose on the Patents in the event of the occurrence
and continuance of an Event of Default under the Loan Documents (as defined in
the Credit Agreement).

        NOW, THEREFORE, in consideration of the premises, Assignor hereby agrees
with the Lender as follows:

1.      To secure the complete and timely satisfaction of all Obligations (as
        defined in the Credit Agreement), Assignor hereby grants and conveys to
        the Lender and collaterally assigns to Lender all of its right, title
        and interest in and to the patent applications and patents listed in
        Schedule A attached hereto, including without limitation all proceeds
        thereof (such as, by way of example, license royalties and proceeds of
        infringement suits), the right to sue for past, present and future
        infringements, all rights corresponding thereto throughout the world and
        all reissues, divisions, continuations, renewals, extensions and
        continuations-in-part thereof (all of the foregoing are collectively
        called the "Patents").

        Unless and until the Lender exercises the rights and remedies accorded
        to it under the Security Agreement, and by law with respect to the
        realization upon its collateral assignment of the Patents, the Lender
        hereby grants to Assignor the exclusive, nontransferable, royalty-free
        right and license under the Patents for Assignor's own benefit and
        account, so that Assignor may use and enjoy the Patents in connection
        with its business operations and exercise rights and remedies with
        respect to the Patents, but with respect to all Patents being used in
        Assignor's business, only in a manner consistent with the preservation
        of the current substance, validity and registration and

                                      -1-
<PAGE>

        the collateral assignment herein granted in such Patents; provided,
        however, that the foregoing shall not impose an obligation on Assignor
        to continue to use any of the Patents in Assignor's business to the
        extent that such Patents are not necessary in the normal conduct of its
        business. Assignor agrees not to sell or assign its interest in, or
        grant any sublicense under, the license granted to Assignor in this
        paragraph, except that the Assignor may sublicense the Patents in the
        ordinary course of the Assignor's business consistent with its past
        practices, but only in a manner consistent with the preservation of the
        current substance, validity and registration and the collateral
        assignment herein granted in such Patents. Upon the exercise by Lender
        of the rights and remedies accorded to it under the Security Agreement
        and by law with respect to the realization upon its collateral
        assignment of the Patents, the license granted under this paragraph to
        the Assignor shall terminate.

2.      In addition to the above mentioned assignment, Guarantor hereby grants
        to the Lender, as security for its obligations under the Guaranty, a
        first ranking movable hypothec under the Civil Code of Quebec in the
        principal amount of Forty Million Canadian Dollars (CDN$40,000,000) with
        interest thereon at the rate of twenty percent (20%) per annum affecting
        the universality of all present and future rights, title and interest
        Guarantor may hold, now or in the future, in the Patents. If, for the
        purpose of obtaining a judgment in any court, it is necessary to convert
        the sum due to the Lender in any currency into Canadian currency,
        Guarantor and the Lender agree, to the fullest extent that they may
        effectively do so, that the rate of exchange used shall be that at
        which, in accordance with normal banking procedure, such Lender could
        purchase the original currency with the Canadian currency on the
        business day preceding the day on which final judgment is given or if
        permitted by applicable law, on the day on which the judgment is paid or
        satisfied.

3.      Assignor covenants and warrants that:

        (a)    The Patents are subsisting and have not been adjudged invalid or
               unenforceable, in whole or in part;

        (b)    To the best of Assignor's knowledge, each of the Patents is valid
               and enforceable;

        (c)    No claim has been made that the use of any of the Patents
               violates or may violate the rights of any third person;

        (d)    Assignor is the sole and exclusive owner of the entire and
               unencumbered right, title and interest in and to each of the
               Patents, free and clear of any liens, charges and encumbrances,
               including without limitation pledges, assignments, licenses, shop
               rights and covenants by Assignor not to sue third persons; and

        (e)    Assignor has the unqualified right to enter into this Patent
               Assignment and perform its terms and has entered and will enter
               into written agreements with all inventors of the Patents which
               will enable it to comply with the covenants herein contained; and

        (f)    Assignor has used, and will continue to use for the duration of
               this Patent Assignment, proper statutory notice in connection
               with its use of the Patents.

4.      Assignor agrees that, until all of the Obligations shall have been
        satisfied in full, it will not enter into any agreement outside the
        ordinary course of Assignor's business consistent with its past
        practices which is otherwise inconsistent with Assignor's obligations
        under this Patent Assignment, without the Lender's prior written
        consent.

                                      -2-
<PAGE>

5.      If, before the Obligations shall have been satisfied in full, Assignor
        shall become entitled to the benefit of any patent application or patent
        for any reissue, division, continuation, renewal, extension, or
        continuation-in-part of any Patent or any improvement on any Patent, the
        provisions of Section 1 shall automatically apply thereto and Assignor
        shall give to the Lender prompt written notice thereof.

6.      Assignor authorizes the Lender to modify this Patent Assignment by
        amending Schedule A to include any future patents and patent
        applications which are Patents under Section 1 or Section 5 hereof.

7.      If any Event of Default (as defined in the Credit Agreement) shall have
        occurred and be continuing, Assignor hereby authorizes and empowers
        Lender to make, constitute and appoint any officer or agent of the
        Lender, as the Lender may select in its exclusive discretion, as
        Assignor's true and lawful attorney-in fact, with the power to endorse
        Assignor's name on all applications, documents, papers and instruments
        necessary for the Lender to use the Patents, or to grant or issue any
        exclusive or nonexclusive license under the Patents to any third person,
        or reasonably necessary for the Lender to assign, pledge, convey or
        otherwise transfer title in or dispose of the Patents to any third
        person. This power of attorney shall be irrevocable for the life of this
        Patent Assignment.

8.      At the earlier of such time as Assignor shall completely satisfy all of
        the Obligations or the Security Agreement terminates, this Patent
        Assignment shall terminate and the Lender shall execute and deliver to
        Assignor all deeds, assignments and other instruments as may be
        necessary or proper to evidence such termination, subject to any
        disposition thereof which may have been made by the Lender pursuant
        hereto.

9.      Any and all fees, costs and expenses, of whatever kind or nature,
        including the reasonable attorney's fees and legal expenses incurred by
        the Lender in connection with the preparation of this Patent Assignment
        and all other documents relating hereto and the consummation of this
        transaction, the filing or recording of any documents (including all
        taxes in connection therewith) in public offices, the payment or
        discharge of any taxes, counsel fees, maintenance fees, encumbrances or
        otherwise protecting, maintaining or preserving the Patents, or in
        defending or prosecuting any actions or proceedings arising out of or
        related to the Patents, shall be borne and paid by Assignor on demand by
        the Lender and until so paid shall be added to the principal amount of
        the Obligations and shall bear interest at the rate effective under the
        Credit Agreement.

10.     Assignor shall have the duty, through counsel reasonably acceptable to
        the Lender, to prosecute diligently any patent applications of the
        Patents pending as of the date of this Patent Assignment or thereafter,
        which Assignor reasonably determines are necessary or desirable for the
        conduct of business, until the Obligations shall have been paid in full,
        to make application on unpatented but patentable inventions and to
        preserve and maintain all rights in patent applications and patents of
        the Patents, including without limitation the payment of all reasonable
        maintenance fees and to do any and all acts which in Assignor's
        reasonable determination are necessary or desirable to preserve and
        maintain all rights in the Patents. Any reasonable expenses incurred in
        connection with the Patents shall be borne by Assignor. Except as
        permitted in Section 1 hereof, Assignor shall not abandon any right to
        file a patent application, or any pending patent application or Patent
        without the consent of the Lender, which consent shall not be
        unreasonably withheld, but in all instances Assignor shall give the
        Lender not less than ten (10) days prior written notice of its intent to
        abandon any Patent.

                                      -3-
<PAGE>

11.     Assignor shall have the right, with the consent of the Lender, which
        shall not be unreasonably withheld, to bring suit to its own name, and
        to join the Lender, if necessary, as a party to such suit so long as the
        Lender is satisfied that such joinder will not subject it to any risk of
        liability, to enforce the Patents and any licenses thereunder. Assignor
        shall promptly, upon demand, reimburse and indemnify the Lender for all
        damages, costs and expenses, including reasonable legal fees and costs,
        incurred by the Lender pursuant to this Section 11.

12.     If Assignor fails to comply with any of its obligations hereunder, the
        Lender may do so in Assignor's name or in the Lender's name, but at
        Assignor's expense, and Assignor hereby agrees to reimburse the Lender
        in full for all reasonable expenses, including reasonable attorneys'
        fees and costs, incurred by the Lender in protecting, defending and
        maintaining the Patents.

13.     No course of dealing between Assignor and the Lender, nor any failure to
        exercise, nor any delay in exercising, on the part of the Lender, any
        right, power or privilege hereunder or under the Credit Agreement or the
        other Loan Documents shall operate as a waiver thereof; nor shall any
        single or partial exercise of any right, power or privilege hereunder or
        thereunder preclude any other or further exercise thereof or the
        exercise of any other right, power or privilege.

14.     All of the Lender's rights and remedies with respect to the Patents,
        whether established hereby or by the Credit Agreement or the other Loan
        Documents, or by any other agreements or by law, shall be cumulative and
        may be exercised singularly or concurrently.

15.     The provisions of this Patent Assignment are severable, and if any
        clause or provision shall be held invalid and unenforceable in whole or
        in part in any jurisdiction, then such invalidity or unenforceability
        shall affect only such clause or provision, or part thereof, in such
        jurisdiction, and shall not in any manner affect such clause or
        provision in any other jurisdiction, or any clause or provision of this
        Patent Assignment in any jurisdiction. This Patent Assignment is to be
        read, construed and applied together with the Security Agreement, the
        Credit Agreement and the other Loan Documents which, taken together, set
        forth the complete understanding and agreement of the Lender and
        Assignor with respect to the matters referred to herein and therein.

16.     This Patent Assignment is subject to modification only by a writing
        signed by the parties, except as provided in Section 6.

17.     The benefits and burdens of this Patent Assignment shall inure to the
        benefit of and be binding upon the respective successors and permitted
        assigns of the parties.

18.     WITH THE EXCEPTION OF THE MOVABLE HYPOTHEC GRANTED BY GUARANTOR PURSUANT
        TO SECTION 2 HEREOF AND THE HYPOTHECARY RECOURSES ARISING THEREFROM
        WHICH SHALL BE GOVERNED BY AND CONSTRUED ACCORDING TO THE LAWS OF THE
        PROVINCE OF QUEBEC, THIS PATENT COLLATERAL ASSIGNMENT AGREEMENT SHALL BE
        INTERPRETED AND THE RIGHTS AND LIABILITIES OF THE PARTIES HERETO
        DETERMINED IN ACCORDANCE WITH THE INTERNAL LAWS (AS OPPOSED TO THE
        CONFLICT OF LAWS PROVISIONS PROVIDED THAT PERFECTION ISSUES WITH RESPECT
        TO ARTICLE 9 OF THE UCC MAY GIVE EFFECT TO APPLICABLE CHOICE OR CONFLICT
        OF LAW RULES SET FORTH IN ARTICLE 9 OF THE UCC) OF THE STATE OF
        WASHINGTON; PROVIDED THAT THE LENDER SHALL RETAIN ALL RIGHTS ARISING
        UNDER FEDERAL LAW.

        SAVE AND EXCEPT FOR ANY HYPOTHECARY RECOURSE IN THE PROVINCE OF QUEBEC
        AGAINST GUARANTOR WHICH SHALL BE UNDER THE JURISDICTION OF THE COURTS OF
        THE PROVINCE OF QUEBEC, ANY LEGAL ACTION OR

                                      -4-
<PAGE>

        PROCEEDING WITH RESPECT TO THIS PATENT COLLATERAL ASSIGNMENT AGREEMENT
        OR ANY OTHER LOAN DOCUMENT MAY BE BROUGHT IN THE COURTS OF THE STATE OF
        WASHINGTON OR OF THE UNITED STATES OF AMERICA LOCATED IN KING COUNTY,
        WASHINGTON, AND BY EXECUTION AND DELIVERY OF THIS PATENT COLLATERAL
        ASSIGNMENT AGREEMENT, EACH OF THE ASSIGNORS AND THE LENDER CONSENTS, FOR
        ITSELF AND IN RESPECT OF ITS PROPERTY, TO THE NON-EXCLUSIVE JURISDICTION
        OF THOSE COURTS. EACH OF THE ASSIGNORS AND THE LENDER IRREVOCABLY WAIVES
        ANY OBJECTION, INCLUDING ANY OBJECTION TO THE LAYING OF VENUE OR BASED
        ON THE GROUNDS OF FORUM NON CONVENIENS, WHICH IT MAY NOW OR HEREAFTER
        HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING IN SUCH COURTS IN
        RESPECT OF THIS PATENT COLLATERAL ASSIGNMENT AGREEMENT OR ANY DOCUMENT
        RELATED HERETO. NOTWITHSTANDING THE FOREGOING: (1) THE LENDER SHALL HAVE
        THE RIGHT TO BRING ANY ACTION OR PROCEEDING AGAINST THE ASSIGNORS OR
        THEIR PROPERTY IN THE COURTS OF ANY OTHER JURISDICTION THE LENDER DEEMS
        NECESSARY OR APPROPRIATE IN ORDER TO REALIZE ON THE COLLATERAL OR OTHER
        SECURITY FOR THE OBLIGATIONS AND (2) EACH OF THE PARTIES HERETO
        ACKNOWLEDGES THAT ANY APPEALS FROM THE COURTS DESCRIBED IN THE
        IMMEDIATELY PRECEDING SENTENCE MAY HAVE TO BE HEARD BY A COURT LOCATED
        OUTSIDE THOSE JURISDICTIONS.

        THE ASSIGNORS HEREBY WAIVE PERSONAL SERVICE OF ANY AND ALL PROCESS UPON
        THEM AND CONSENT THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY
        REGISTERED MAIL (RETURN RECEIPT REQUESTED) DIRECTED TO THE ASSIGNORS AT
        THEIR ADDRESSES SET FORTH IN SECTION 12.8 OF THE CREDIT AGREEMENT AND
        SERVICE SO MADE SHALL BE DEEMED TO BE COMPLETED FIVE (5) DAYS AFTER THE
        SAME SHALL HAVE BEEN SO DEPOSITED IN THE U.S. MAIL POSTAGE PREPAID.
        NOTHING CONTAINED HEREIN SHALL AFFECT THE RIGHT OF THE LENDER TO SERVE
        LEGAL PROCESS BY ANY OTHER MANNER PERMITTED BY LAW.

19.     ASSIGNORS AND THE LENDER EACH IRREVOCABLY WAIVE THEIR RESPECTIVE RIGHTS
        TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
        OUT OF OR RELATED TO THIS PATENT COLLATERAL ASSIGNMENT AGREEMENT, THE
        OTHER LOAN DOCUMENTS, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR
        THEREBY, IN ANY ACTION, PROCEEDING OR OTHER LITIGATION OF ANY TYPE
        BROUGHT BY ANY OF THE PARTIES AGAINST ANY OTHER PARTY OR ANY
        LENDER-RELATED PERSON OR PARTICIPANT, WHETHER WITH RESPECT TO CONTRACT
        CLAIMS, TORT CLAIMS, OR OTHERWISE. THE ASSIGNORS AND THE LENDER EACH
        AGREE THAT ANY SUCH CLAIM OR CAUSE OF ACTION SHALL BE TRIED BY A COURT
        TRIAL WITHOUT A JURY. WITHOUT LIMITING THE FOREGOING, THE PARTIES
        FURTHER AGREE THAT THEIR RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED
        BY OPERATION OF THIS SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER
        PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY
        OR ENFORCEABILITY OF THE CREDIT AGREEMENT, THIS PATENT COLLATERAL
        ASSIGNMENT AGREEMENT OR THE OTHER LOAN DOCUMENTS OR ANY PROVISION HEREOF
        OR THEREOF. THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
        RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THE CREDIT AGREEMENT, THIS
        PATENT COLLATERAL ASSIGNMENT AGREEMENT AND THE OTHER LOAN DOCUMENTS.

                                      -5-
<PAGE>

        IN WITNESS WHEREOF, each of the parties hereto has caused this Patent
Assignment to be executed and delivered by its duly authorized officer as of the
date first set forth above.

BORROWERS:

SPACELABS MEDICAL, INC.,                    VITA-STAT MEDICAL SERVICES, INC.,
a Delaware corporation                                    a Florida corporation

By:                                         By:
   ---------------------------------           ---------------------------------

   Its:                                        Its:
       -----------------------------               -----------------------------

SPACELABS MEDICAL, INC.,                    LIFECLINIC MEDICAL DATA
a California corporation                    CORPORATION, a Washington
corporation

By:                                         By:
   ---------------------------------           ---------------------------------

   Its:                                        Its:
       -----------------------------               -----------------------------

SPACELABS BURDICK, INC.,                    LIFECLINIC.COM CORPORATION,
a Delaware corporation                      a Washington corporation

By:                                         By:
   ---------------------------------           ---------------------------------

   Its:                                        Its:
       -----------------------------               -----------------------------

GUARANTOR:

SPACELABS PRODUITS MEDICAUX
LTEE., a Quebec company

By:
   ---------------------------------

   Its:
       -----------------------------

LENDER:

BANK OF AMERICA, N.A.,
a national banking association

By:
   ---------------------------------

   Its:
       -----------------------------

                                      -6-
<PAGE>

                              Schedule A - Page 1

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