LETTER OF AGREEMENT

         THIS LETTER AGREEMENT is made and entered into as of the 11th day of
September, 1995 by and between MISONIX, INC., a New York Corporation with its
principal offices at 1938 New Highway, Farmingdale, New York 11735 (hereinafter
referred to as "MISONIX") and MEDICAL DEVICE ALLIANCE, INC., ("MDA") a Nevada
Corporation having its principal offices at 3315 East Russell Road, Suite H-193,
Las Vegas, Nevada 89120 (hereinafter referred to as "MDA").

                              W I T N E S S E T H:

         WHEREAS, MISONIX has a business which is, in part, based on the
research, development, and manufacturing of ultrasonic equipment for scientific
and industrial purposes; and

         WHEREAS, MDA has a business that has been organized to market and sell,
on a worldwide basis, medical devices specifically designed to improve the
treatment of patients desiring a surgical procedure commonly referred to as
"Liposuction" or "Liposculpturing" (hereinafter referred to as the "Procedure");
and

         WHEREAS, MISONIX has already utilized its engineering experience,
ultrasonic technology, and prototype manufacturing capabilities to design and
assemble one or more ultrasonic systems (hereinafter referred to as the
"System") specifically for use in performing the Procedure; and

         WHEREAS, MDA has experience in identifying various needs in marketing
and selling to the medical fields on a worldwide basis, especially the
specialties of Plastic and Reconstructive Surgery, Cosmetic Surgery and Surgical
Dermatology; and

         WHEREAS, MISONIX desires to continue further technical and application
engineering directed to advanced designs of the System utilizing its patented
technology and, in addition, manufacture the finished product; and

         WHEREAS, MDA desires to use its market and selling skills to market the
System on an exclusive worldwide basis.

         NOW THEREFORE, in consideration of the premises and promises,
warranties and representations herein contained, the parties hereto agree as
follows:

         I.       Exclusive Option Period:  MISONIX will provide MDA an
exclusive option period to evaluate the System under the

following conditions:

                  A.       Length of exclusive option period to be ninety
                           (90) calendar days, commencing on September 11,

                           1995.








                  B.       MISONIX shall deliver to MDA a functional
                           prototype System, of the latest design, as soon
                           as possible, but in no case, later than September

                           24, 1995.

                  C.       MDA will pay MISONIX twenty-five thousand dollars
                           ($25,000.00) upon executing this Letter Agreement
                           for the Exclusive Option Period.

                  D.       Development funding for the autoclavability (i.e.
                           sterilization) of the converter and umbilical cable
                           and the manufacturability of the System will be
                           provided by MDA. It is estimated at a maximum of
                           thirty thousand ($30,000.00) per month until the
                           start of production. A fifteen thousand dollar
                           ($15,000) advance will be made by MDA to MISONIX
                           against future billings (the "Advance") for the
                           purpose of assuring that MISONIX will implement the
                           start of the subject development work as soon as
                           possible: MISONIX will invoice MDA following the end
                           of each month for the actual amount expended, which
                           is to be paid by MDA within ten (10) working days of
                           invoicing by MISONIX. In this manner, the Advance
                           will continue to remain with MISONIX, on a
                           month-to-month basis, as a credit balance in favor of
                           MDA, until the start of production, when the credit
                           provisions of the License Agreement (II.D) come into
                           effect. Estimated time frame will be six months,
                           subject to suggestions of, and modifications by,
                           technicians for both parties.

                  E.       MDA will pay MISONIX  an additional twenty-five
                           thousand dollars ($25,000.00) on November 11,
                           1995, for the last thirty (30) days of the
                           Exclusive Option Period unless:

                           1.       MDA notifies MISONIX that it is terminating
                                    this Letter of Agreement and thus forgoing
                                    any further rights to market and sell the
                                    System; or

                           2.       MISONIX and MDA have mutually agreed to the
                                    final terms and conditions of the License
                                    Agreement that forgoes the remainder of the
                                    Option Agreement, and is effective when an
                                    executed original of the License Agreement,
                                    is delivered to both parties.


         II.      License Agreement:  The License Agreement between
MISONIX and MDA shall be executed prior to the conclusion of the
ninety (90) day option period and no later than December 11,
1995, and will be good for a period of ten (10) years ending on
December 31, 2005.  The basic terms and conditions of the
License Agreement shall be:

                  A.       MDA To Receive:

                           1.       Exclusive worldwide marketing and sales
                                    rights to the System utilizing MISONIX
                                    Ultrasonic Liposuction technology (including
                                    Patent No. 5,419,761; and all improvement
                                    patents and foreign patents now or hereafter
                                    held by MISONIX).  MISONIX retains the
                                    rights to ultrasonic technologies for
                                    non-medical applications.



                                       -2-







                           2.       Exclusive rights to utilize MISONIX letter,
                                    dated October 15, 1993, from the U.S. Food
                                    and Drug Administration, which provides for
                                    marketing the System under Section 510(K),
                                    based on substantial equivalence to devices
                                    marketed prior to enactment of the Medical
                                    Device Act of 1976.

                           3.       Access to MISONIX technical support and the
                                    design history of the System.

                           4.       Right to modify specifications to meet
                                    clinical/market needs at MDA's cost.

                           5.       Right of name and logo selection by MDA.

                           6.       Commitment by MISONIX to designate and
                                    supply a dedicated product development team
                                    to work with MDA market development team and
                                    support staffs for successful project
                                    development.

                           7.       First right of license for existing
                                    technology improvements or future medical
                                    technology developed by MISONIX (except for
                                    angioplasty) while the License Agreement is

                                    in force.

                  B.       MISONIX to Receive:

                           1.       A License Fee payment of three hundred
                                    thousand dollars ($300,000.00) upon
                                    execution of the License Agreement.

                           2.       MDA will provide market and application
                                    development, and a clinical and marketing
                                    plan (milestones) to MISONIX.  MDA to be
                                    responsible for planning and funding
                                    clinical tests of the System.

                           3.       Upon delivery of five (5) prototype units,
                                    MDA will pay the cost of the Systems which
                                    is four thousand dollars ($4,000.00) per
                                    unit, plus an additional License Fee of one
                                    hundred thousand dollars ($100,000.00).

                           4.       At the start of regular production, or one
                                    year from the date of the License Agreement,
                                    the additional License Fee of one hundred
                                    thousand dollars ($100,000.00) will be paid
                                    by MDA for a total license fee payment of
                                    five hundred thousand dollars ($500,000.00).

                           5.       Furthermore a Royalty Fee of five percent
                                    (5%) will be paid on net sales of the System
                                    and accessories sold.



                                       -3-






                           6.       MDA to grant MISONIX a security interest in
                                    this License Agreement to secure performance
                                    by MDA of its obligations thereunder.

         C.       Both to Agree:

                  1.       Mutual non-competition clause in Ultrasonic
                           Assisted Liposuction for the life of this Agreement.

         D.       Quantity and Price.  MISONIX agrees to sell to MDA and
                  MDA agrees to buy from MISONIX one hundred percent
                  (100%) of MDA's requirement of the aforesaid
                  Ultrasonic Assemblies in accordance with the
                  specifications set forth in Schedule A.  Technological

                  changes and variations from the prototype
                  specifications shall increase the cost appropriately.
                  The prices can be increased by MISONIX only under one
                  of the following circumstances:  MISONIX may, with
                  written notification to MDA, increase the price in
                  accordance with the rise in the Official Consumer
                  Price Index (CPI).  Such increase in the price in
                  accordance with the CPI, can be made once each year
                  during the term of the Agreement, except during the
                  first year, and whenever the cost of labor and/or raw
                  material to MISONIX changes substantially, MISONIX may
                  change the price of the Ultrasonic Units, with a
                  ninety (90) day advance written notice to MDA, to
                  reflect such substantially changing and/or raw
                  material costs.  All Ultrasonic Units for MDA will be
                  manufactured in accordance with the specifications set
                  forth in Schedule B.

                  All shipments will be F.O.B. point of origin. MDA will remit
                  payment within thirty (30) days from the date each invoice is
                  received by MDA with respect to shipments of Ultrasonic Units.
                  Credit terms: (a) open account for up to 20 Units at any time
                  (b) balance by Letter of Credit or fifty percent (50%) cash
                  payment at time of order. MDA has no obligation to pay for any
                  shipment of Ultrasonic Units that does not meet the
                  specifications as set forth in Schedule B and have been
                  returned to, and accepted by, MISONIX for credit.

         E.       Delivery.  MDA shall submit purchase orders setting
                  forth the quantities, delivery date and shipping
                  instructions with respect to each shipment such
                  purchase order to be received by MISONIX at least
                  ninety (90) days prior to the stipulated delivery
                  date.  MISONIX shall ship each order to MDA or MDA's
                  designee to the location specified, as instructed by
                  MDA.

         F.       Quality.  It is understood and agreed that all
                  Ultrasonic Units sold to MDA hereunder will meet the
                  established specifications, as described in the
                  attached Schedule B, which Schedule may be revised
                  from time to time by agreement of the parties
                  hereunder.  Furthermore, MISONIX shall be responsible
                  to adhere to current good manufacturing practice (GMP)
                  and to all applicable U.S. governmental laws and
                  regulations, as may be amended from time to time
                  relating to the manufacture, sale and shipment of
                  Ultrasonic Units sold hereunder.  Cost of future
                  filings and modifications of units necessitated
                  thereby to be borne by MDA, which shall receive prior
                  notice of proposed actions and expenditures and shall
                  participate in the decision making process.



                                       -4-







         G.       Quality Assurance.  MISONIX will provide MDA with the
                  test results of all Ultrasonic Units to be shipped to
                  MDA.  Furthermore, MISONIX shall advise MDA of any
                  changes in the manufacturing process or in materials
                  which have an impact on the quality or performance of,
                  or regulatory issues relating to, the Ultrasonic Units
                  purchase hereunder.

                  All Ultrasonic Units delivered to MDA shall be subject to
                  acceptance by MDA's quality assurance staff acting reasonable.
                  Unless MDA gives MISONIX notice to the contrary within ten
                  (10) working days after receipt of a shipment of a Product,
                  such shipment shall be deemed to be accepted by MDA. MDA or
                  MDA's designee shall have the right to reject any shipment
                  made to it hereunder which does not meet such quality
                  assurance specifications when such products are received. In
                  the event that any such shipment is not approved by MDA
                  because it does not meet said specification, MDA shall advise
                  MISONIX in writing and MISONIX agrees to replace such shipment
                  at its expense including charges incurred by MDA for freight
                  and customs clearance if application, and resubmit to MDA
                  within forty-five (45) days. At MISONIX'S option, MDA shall
                  return any such rejected shipment to MISONIX at MISONIX'S
                  expense.

         H.       Taxes.  Any and all taxes imposed upon or with respect
                  to or measured by the sale or delivery by MISONIX to
                  MDA of Ultrasonic Units in accordance with MDA's
                  instructions shall be for MDA's account.

         I.       Force Majeure.  MISONIX'S obligations and any delays
                  in deliveries hereunder or portion thereof, and MDA's
                  obligations to take delivery hereunder when due, shall
                  be excused by strikes, riots, war, invasion, acts of
                  God, fire, explosion, floods, delay of carrier,
                  shortages or failures in the supply of materials, acts
                  of government agencies or instrumentality's, judicial
                  action, delay in constructing manufacturing
                  facilities, and other contingencies beyond the
                  reasonable control of the party to be excused.  In
                  such event(s), MISONIX will make reasonable efforts to
                  fulfill MDA's requirements for and MDA will make
                  reasonable efforts to take delivery of Ultrasonic
                  Units as defined herein,  If for any of the reasons
                  set forth above, MISONIX shall be unable to delivery
                  any of the agreed upon quantities of MISONIX

                  Ultrasonic Units when due, MISONIX shall immediately
                  notify MDA of such inability and of the period for
                  which such inability is expected to continue.  In the
                  event MDA elects to manufacture or have Ultrasonic
                  Units manufactured by a third party, MDA may use or
                  release to said third party MISONIX'S confidential
                  technical information and know-how relating to
                  Ultrasonic Units under a confidentiality agreement
                  acceptable to MISONIX, which shall not be unreasonably
                  withheld, to enable MDA or said third party to
                  manufacture Ultrasonic Unit for MDA's account.

         J.       Term.  This Agreement shall be effective when signed
                  by both parties, and shall continue in effect for a
                  period of ten (10) years.  MDA shall have the option
                  to renew this Agreement for five (5) successive one (1)
                  year periods on the same terms and conditions, and the
                  price of Ultrasonic Units to be purchased during each
                  one (1) year period shall also be determined pursuant
                  to the terms and conditions of this Agreement.  MDA
                  must notify MISONIX that it intends to 

                                      -5-

                  exercise the option at least sixty (60) days prior to the
                  expiration of the ten (10) year term of the present
                  Agreement, and thereafter in each successive year at
                  least sixty (60) days prior to the expiration of the year
                  in which the option is being exercised.

         K.       Termination for Cause.  If either party shall at any
                  time fail to abide by any of the provisions of the
                  Agreement, the other party shall have the right to
                  terminate this Agreement on sixty (60) days prior
                  written notice to the defaulting party specifying the
                  default complained of, provided, however, if said
                  defaulting party cures the default complained of
                  within the said sixty (60) day period, or if a non-
                  monetary default which reasonably would take more than
                  60 days to cure and the defaulting party is actively
                  taking steps to cure the same, the Agreement shall
                  continue in full force and effect as if no default has
                  occurred.  The right of either party to terminate this
                  Agreement, as hereinabove provided, shall not be
                  affected in any way by its waiver of, or its failure
                  to take action with respect to, any previous default.
                  This Agreement may also be terminated by the other
                  party in the event that a petition of bankruptcy is
                  filed by or against a party and not dismissed within
                  30 days, or a receiver or trustee is appointed for all
                  or a part of the property of a party or a party makes
                  an assignment for the benefit of creditors.

         L.       Rights of Termination.  Any termination of this

                  Agreement as provided herein shall not relieve either
                  party of any obligation arising hereunder prior to such 
                  termination.

         M.       Inability To Supply Full Requirements.  In the event
                  that MISONIX cannot supply one hundred percent (100%)
                  of MDA's requirement of Ultrasonic Units, after
                  reasonable prior notice and time to gear up for this,
                  MDA may either itself manufacture or have a third
                  party manufacture the amount not supplied by MISONIX
                  during the period that MISONIX cannot supply the
                  same.  MDA may release to said third party MISONIX'S
                  confidential information and know-how relating to
                  Ultrasonic Units under a confidentiality agreement
                  acceptable to MISONIX which shall not be unreasonably
                  withheld, to enable the third party to manufacture the
                  amount of Ultrasonic Units not supplied by MISONIX for
                  MDA.

         N.       Purchase Orders.  The provisions of this Agreement
                  shall prevail over any inconsistent statements of
                  provisions contained in any document related to this
                  Agreement previously passing between companies.  This
                  Agreement shall supersede and prevail over any other
                  agreement applicable to the subject matter of this
                  Agreement between the parties which may be in  effect
                  at the time this Agreement is executed.

         O.       Limited Warranty and Liability

                  1.       MISONIX warrants that the materials described herein
                           shall meet the specifications as set forth in
                           Schedule B, but DOES NOT WARRANT THE SUITABILITY OR
                           USES WHICH MAY BE MADE OF THE SAME OR THE UNITS TO BE
                           PRODUCED HEREUNDER.



                                       -6-







                  2.       Except as provided in Paragraph (3) hereafter,
                           MISONIX shall not be liable for , and MDA assumes
                           responsibility for, and hereby agrees to
                           indemnify and hold harmless MISONIX for and
                           against all costs, expenses and damages
                           (including reasonable attorney's fees arising
                           from any claim for personal injury and property
                           damage resulting from the handling of the


                           Ultrasonic Units, following MDA's acceptance of
                           the Ultrasonic Units after it has completed its
                           testing as provided in Quality Assurance.

                  3.       Except as provided in paragraph (5) hereof, MDA
                           shall not be liable for, and MISONIX assumes
                           responsibility for and agrees to indemnify and
                           save harmless, MDA, for all personal injury and
                           property damages which occur during MISONIX'S
                           manufacturing process of Ultrasonic Units or
                           which Ultrasonic Units are being delivered to MDA
                           or its designees or for claims based on
                           violations of Federal, State or local laws or
                           regulations applicable to employee or
                           environmental protection in such manufacture or
                           delivery by MISONIX; e.g., a claim based on
                           MISONIX'S violations of environmental standards,
                           standards dealing with providing a safe place to
                           work, or the transportation of hazardous
                           materials.

                  4.       Either party, upon learning of the claim or
                           lawsuit, under Paragraphs (2) or (3) of this
                           Article, shall notify the other, but MDA's
                           attorneys shall handle and control such claims or
                           suits which fall under Paragraph on Limited
                           Warranty and Liability (2) and MISONIX'S
                           attorneys shall handle and control such claims or
                           suits which fall under Paragraph on Limited
                           Warranty and Liability (3).

                  5.       Notwithstanding the foregoing provisions hereof,
                           MDA shall secure product liability insurance
                           coverage covering personal injury and property
                           damage for the products produced hereunder, at
                           the full cost and expense of MDA, in an amount of
                           not less than five million dollars ($5,000,000)
                           with a deductible of approximately two hundred
                           thousand dollars ($200,000), covering both
                           MISONIX and MDA for any and all liability.

         P.       Arbitration.  All disputes between the parties arising
                  hereunder shall be finally settled by arbitration in
                  the City of New York, by the American Arbitration
                  Association, by a board of three arbitrators one of
                  whom is selected by each party and the third selected
                  by the two arbitrators, or if they cannot agree, from
                  the lists of the American Arbitration Association.

         Q.       Notices.  Any notice or request required or permitted
                  to be given under or in connection with this Agreement
                  shall be deemed to have been sufficiently given if in
                  writing and delivered to an officer of such party or
                  sent by registered airmail, telex or telegram,

                  prepaid, to the party for which such notice is
                  intended, at the address set forth for such party
                  below:


                                       -7-







                  In the case of MDA:       President
                                            Medical Device Alliance, Inc.
                                            3515 East Russell Road
                                            Suite H-393
                                            Las Vegas, Nevada 89120

                  In the case of MISONIX:   President
                                            Misonix, Incorporated
                                            1938 New Highway
                                            Farmingdale, NY 11735

                  or to such other address for such party as it shall have
                  therefore furnished in writing to the other party. If sent by
                  mail, telex or telegram, the date of mailing or transmission
                  shall be deemed to be the date on which such notice or request
                  has been given.

         R.       Assignment.  MDA or MISONIX may assign rights under
                  this Agreement in whole or in part to any of their
                  respective affiliates or subsidiaries.  Upon the other
                  party's request, the assigning party shall enter into
                  a separate counterpart agreement with any such
                  affiliate or subsidiary, it being expressly agreed
                  that assignor shall remain bound by the obligations
                  hereof.  Such counterpart agreement shall be in the
                  same form as this Agreement, except for necessary
                  changes to reflect the extent of the assignment, the
                  substitution of the affiliate's or subsidiary's name,
                  the effective date of the assignment and the inclusion
                  of a new provision enabling the non-assigning party to
                  terminate such separate counterpart agreement in the
                  event that the assignee ceases to be an affiliate or
                  subsidiary of the assigning party.  This Agreement
                  shall not otherwise be assignable by either party
                  without the prior written consent of the other party.

         S.       Entire Agreement.  This Agreement sets forth the
                  entire Agreement and understanding between the parties
                  as to the subject matter hereof and merges all prior
                  discussions and negotiations between them, and neither
                  of the parties shall be bound by any conditions,

                  definitions, warranties, understandings or
                  representations with respect to such subject matter
                  other than as expressly provided herein or as duly set
                  for the on or subsequent to the date hereof in writing
                  and signed by a proper and duly authorized officer or
                  representative of the party to be bound thereby.

         T.       Governing Law.  This Agreement shall be construed in
                  accordance with the laws of the Sate of New York.

         U.       Confidentiality.  After execution of the License
                  Agreement, MISONIX shall disclose to MDA all technical
                  information reasonably necessary to use Ultrasonic
                  Units or their equivalents, and MDA shall hold such
                  information except as provided in Paragraphs dealing
                  with Force Majeure and Inability To Supply Full
                  Requirement of this Agreement.  MISONIX shall also
                  release to MDA all technical information and know-how
                  which are reasonably necessary to 

                                      -8-

                  manufacture Ultrasonic Units, and MDA may use such
                  information the manner set forth in the aforementioned
                  Paragraphs of this License Agreement to manufacture
                  Ultrasonic Units or to have such devices manufactured by
                  a third party only as permitted in this License
                  Agreement.  In addition to and not in lieu hereof, the
                  parties re-affirm the provisions of the confidential
                  Disclosure Agreement dated 8/11/95 which remains in
                  effect and is annexed as Schedule C hereto.


Information which is necessary for obtaining or maintaining approval of
Ultrasonic Units or its equivalents by any regulatory agency of any foreign
country shall be an exception to the above confidentiality obligations, but only
to the extent necessary and provided said confidentiality is maintained to the
fullest extent possible by MDA.


         IN WITNESS WHEREOF, this Letter Agreement has been entered into as of
the day and year first above written.

Very truly yours,

ACCEPTED AND AGREED:

     MISONIX, INCORPORATED          MEDICAL DEVICE ALLIANCE, INC.

By:   s/Joseph Librizzi             By:  Donald K. McGhan
      -----------------                  ----------------
      Joseph Librizzi                    Donald K. McGhan
Its:  President and CEO             Its: Chairman
                                    


                                       -9-






                                   SCHEDULE A


                                       -10-







                                   Schedule A

Breakdown of estimated pricing of System components

===============================================================================
Item                                                         Price

- -------------------------------------------------------------------------------
                             For Minimum of 200       
                                or more Units            100 or more Units
                                -------------            -----------------

Generator                           $ 2,330                    $ 2,950
                                                         
Convertor                             1,400                       2050
                                                         
RF Cable                                700                        700
                                                         
Tools                                    50                         50
                                                         
Manuals                                  20                         20
                                    -------                    -------
                                                         
Total System Cost                  $ 4,500*                   $ 5,770*
                                                         
* Estimate as of 8/10/95                                 
                                                         
Tips and Sheaths                                         
                                                         
5MM Probe                               500                        750
                                                         
5MM Sheath                              100                        150
                                                         
7MM Probe                               500                        750
                                                         
7MM Sheath                              100                        150
                                                 
o Costs based upon initial commitment of 200 units
o All prices based upon designs and costs developed as of 9/94

o Costs subject to change as design is finalized


                                       -11-






                                   SCHEDULE B


                                      -12-





Specifications of Ultrasonic system

Generator Model xxxx

================================================================================
Controls and Displays  Timer: elapse time with US on resettable
                       Output power+/-3%
                       Power Setting
                       On/Off switch with pilot light
                       Fault indicator/shut down (possible audible)
                       Time Totalizer (rear)
- --------------------------------------------------------------------------------
Output Control         Adjusts amplitude of power output 0 to 100%
                       Rear Connector foot switch control

- --------------------------------------------------------------------------------
Horn Frequency         20Khz+/-__ Khz and Output power ultrasonic __ Watts
- --------------------------------------------------------------------------------
Line Voltage           Line Selectable Models for World Wide Distribution
                       100/120/220/240 VAC 48-60 Hz _____VA UL approval

- --------------------------------------------------------------------------------
Mechanical             Weight __lbs  _____in. L x ___ in. W x ___ in. H
- --------------------------------------------------------------------------------
Temperature            Operating 10(degree) C to 40(degree) C

- --------------------------------------------------------------------------------
Tuning                 Factor Set with Matched converter & probe

- --------------------------------------------------------------------------------
Converter              Weight ___ ozs. __ in. max dia. w/o cable Autoclavable*
- ---------
- --------------------------------------------------------------------------------
Probe style            Type 7mm>25cm length Weight ___ ozs. Autoclavable*
- -----------
Titanium               Type 5mm>25cm length Weight ___ ozs. Autoclavable*
ELI alloy              Type 7mm>16cm length Weight ___ ozs. Autoclavable*
                       Type 5mm>16cm length Weight ___ ozs. Autoclavable*

- --------------------------------------------------------------------------------
Sheath style           Type 7mm-25cm__ ozs.  16cm ___ ozs.  Autoclavable*

- ------------
                       Type 5mm-25cm__ ozs.  16cm ___ ozs.  Autoclavable*
- --------------------------------------------------------------------------------
Umbilical cable        Weight ___ lbs      Length 12 Ft. Autoclavable*
- ---------------
- --------------------------------------------------------------------------------

*   Autoclavable 200 cycles (500 cycle goal) by Flash sterilizer for 3 minutes
    at 270(degree)and 30 PSI or Normal cycle sterilizer for 30 minutes at
    250(degree)F and 15 PSI
================================================================================



                                      -13-