EXHIBIT 10.15

               PATENT COLLATERAL ASSIGNMENT AND SECURITY AGREEMENT


           THIS  AGREEMENT  is made as of the 21st day of January,  2000 between
Medical Technology & Innovations, Inc., a Florida corporation,  having a mailing
address at 3725 Investment Lane, Riviera Beach, Florida 33404 ("Assignor"),  and
International  Investment  Partners,  Ltd.,  a  Delaware  corporation,  having a
mailing address at 80 Abbeyville Road, Lancaster, Pennsylvania 17603 ("Lender").

           WHEREAS,  Assignor has executed and  delivered  its  promissory  note
dated  January 21, 2000 (the "Note"),  to the Lender in the aggregate  principal
amount of One Million Dollars ($1,000,000), pursuant to a certain Loan Agreement
dated  January 21, 2000 between  Assignor and the Lender and various  other loan
documents (the "Loan Documents"). To secure the complete and timely satisfaction
of all  existing  and future  indebtedness  and  obligations  of the Assignor to
Lender  (the  "Liabilities"),  Assignor  has agreed to assign to Lender  certain
patent rights.

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

     1. To secure the complete and timely  satisfaction  and  performance of the
Liabilities,  Assignor hereby grants,  assigns and conveys to Lender  Assignor's
entire right,  title and interest in and to the patent  applications and patents
listed in Schedule A 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  and all
rights corresponding  thereto throughout the world and all reissues,  divisions,
continuations,  renewals,  extensions and continuations-in-part  thereof and any
future    reissue,    division,    continuation,    renewal,    extension,    or
continuation-in-part  of any Patent or any  improvement  on any  Patent,  as set
forth in Paragraph 4, infra., (collectively called the "Patents").

     2. 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  and Assignor has notified  Lender in writing of all prior
     art (including public uses and sales) of which it is aware;

          (c)  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, registered user agreements and
     covenants by Assignor not to sue third persons;

          (d) Assignor has the  unqualified  right to enter into this  Agreement
     and  perform  its  terms  and has  entered  and  will  enter  into  written
     agreements  with each of its  present  and  future  employees,  agents  and
     consultants  which  will  enable it to  comply  with the  covenants  herein
     contained,  including  but not  limited to  agreements  obligating  them to
     assign present and future inventions to the Assignor.

     3.  Assignor  agrees  that,  until all of the  Liabilities  shall have been
satisfied  in full,  it will not enter into any  license or any other  agreement
which is inconsistent with Assignor's obligations under this Agreement,  without
Lender's prior written consent.

     4. If, before the Liabilities  shall have been satisfied in full,  Assignor
shall obtain rights to any new patentable inventions,  or 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 paragraph 1 shall  automatically
apply  thereto  and  Assignor  shall  give to Lender  prompt  notice  thereof in
writing.

     5. Assignor authorizes Lender to modify this Agreement by amending Schedule
A to include any future Patents and Patent  applications which are Patents under
paragraph 1 or paragraph 4 hereof.

     6. Assignor  agrees to pay all  maintenance  fees for all Patents listed in
Schedule A in a timely manner.




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     7. Unless and until there shall have  occurred and be  continuing a default
hereunder or under any of the Loan  Documents  Lender  hereby grants to Assignor
the exclusive, nontransferable right and license under the Patents to make, have
made for it, use and sell the  inventions  disclosed  and claimed in the Patents
for Assignor's own benefit and account and for none other.  Assignor  agrees not
to sell the  license,  or grant any  sublicense  under,  the license  granted to
Assignor in this paragraph 6, without the prior written consent of Lender.

     8. If any default shall have occurred and be continuing hereunder or any of
the Loan  Documents,  Assignor's  license  under  the  Patents  as set  forth in
paragraph 6, shall terminate  thereupon,  and 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 entered in any  jurisdiction  in which the Patents  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) to  Assignor,  all of which are  hereby  expressly  waived,  and  without
advertisement,  sell at public or private sale or  otherwise  realize  upon,  in
Pennsylvania,  or elsewhere, all or from time to time any of the Patents, or any
interest  which the  Assignor may have  therein,  and after  deducting  from the
proceeds of sale or other disposition of the Patents all expenses (including all
reasonable  expenses  for  brokers'  fees and legal  services),  shall apply the
residue of such proceeds toward the payment of the Liabilities. Any remainder of
the proceeds after payment in full of the Liabilities  shall be paid over to the
Assignor.  Notice of any sale or other disposition of the Patents shall be given
to  Assignor at least five (5) days  before the time of any  intended  public or
private sale or other  disposition of the Patents is to be made,  which Assignor
hereby agrees shall be reasonable notice of such sale or other  disposition.  At
any such sale or other disposition, any holder of the Note or Lender may, to the
extent  permissible  under applicable law, purchase the whole or any part of the
Patents sold,  free from any right of redemption on the part of Assignor,  which
right is hereby waived and released.

     9. If any default shall have occurred and be continuing  hereunder or under
any of the Loan  Documents,  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 Patents, or to
grant or issue any exclusive or  non-exclusive  license under the Patents to any
third  person,  or necessary for Lender to assign,  pledge,  convey or otherwise
transfer title in or dispose of the Patents to any third person. Assignor hereby
ratifies all that such attorney-in-fact shall lawfully do or cause to be done by
virtue hereof.  This power of attorney shall be irrevocable for the life of this
Agreement.

     10.  At  such  time  as  Assignor  shall  completely  satisfy  all  of  the
Liabilities, this Agreement shall terminate and 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  Patents,  subject  to any
disposition thereof which may have been made by Lender pursuant hereto.

     11. Any and all reasonable  fees,  costs and expenses,  of whatever kind or
nature,  including  attorneys'  fees and legal  expenses  incurred  by Lender in
connection  with the  enforcement of any of the provisions of this Agreement and
all other  documents  relating  hereto and the  consummation  of the transaction
contemplated  by the Loan  Documents,  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 Lender and until so paid shall
be added to the principal  amount of the  Liabilities and shall bear interest at
the highest rate prescribed in the Note.

     12. Assignor shall have the duty,  through counsel acceptable to Lender, to
prosecute  diligently any patent  applications  of the Patents pending as of the
date of this Agreement or thereafter until the Liabilities  shall have been paid
in full, to make federal 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 maintenance fees. Any
expenses incurred in connection with the Patents shall be borne by Assignor. The
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.

     13. Assignor shall have the right,  with the consent of Lender,  which will
not be unreasonably withheld, to bring suit in its own name, and to join Lender,
if necessary,  as a party to such suit so long as 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  Lender  for  all  damages,   costs  and  expenses,   including  legal
fees,incurred by Lender pursuant to this paragraph 12.



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     14.  If  Assignor  fails to  comply  with any of its  material  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  expenses,  including  reasonable  attorneys'  fees  incurred  by  Lender in
protecting, defending and maintaining the Patents.

     15. No course of dealing  between  Assignor and Lender,  nor any failure to
exercise,  nor any delay in exercising,  on the part of Lender, any right, power
or privilege  hereunder or under the 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.

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

     17. The provisions of this  Agreement are  severable,  and if any clause or
provision  shall be held  invalid  or  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 Agreement in any jurisdiction.

     18. This Agreement is subject to  modification  only by a writing signed by
the parties, except as provided in paragraph 5.

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

     20. The validity and  interpretation  of this  Agreement and the rights and
obligations of the parties shall be governed by the laws of the  Commonwealth of
Pennsylvania.

     WITNESS the  execution  hereof,  under  seal,  as of the day and year first
above written.


ATTEST:                            ASSIGNOR:
                                   MEDICAL TECHNOLOGY & INNOVATIONS, INC.

 By /s/ Annalisa B.  Pegg          By /s/ Joseph R.  DelVecchio
------------------------           -----------------------------------------
Name:      Annalisa B.  Pegg       Name: Joseph R.  DelVecchio
Title:     Office Manager          Title: Ex V.P. / COO


ATTEST:                            LENDER:
                                   INTERNATIONAL INVESTMENT PARTNERS, LTD.

 By /s/ Annalisa B.  Pegg          By /s/ Brian A Auchey
------------------------           -----------------------------------------
Name:      Annalisa B.  Pegg       Name: Brian A Auchey
Title:     Office Manager          Title:  Vice President