GUARANTY
      AGREEMENT


     

    THIS
      GUARANTY AGREEMENT (this “Guaranty”)
      is
      made as of September 28, 2007, by and between XENI
      MEDICAL SYSTEMS, INC.,
      a
      Delaware corporation (“Debtor”),
      and
      VICIS CAPITAL MASTER FUND (“Vicis”),
      a
      series
      of the Vicis Capital Master Trust, a trust formed under the laws of the Cayman
      Islands.

     

    RECITALS

     

    A. Debtor
      is
      either a direct or an indirect wholly-owned subsidiary of MDwerks,
      Inc., a
      Delaware corporation (“Issuer”).
      

     

    B. Pursuant
      to a Securities Purchase Agreement of even date herewith by and between Vicis
      and Issuer (as amended or modified from time to time, the “Securities
      Purchase Agreement”),
      Issuer has issued to Vicis and Vicis has purchased from Issuer $2,000,000 in
      shares of the Issuer’s Series B Convertible Preferred Stock, par value $.001 per
      share (the “Preferred
      Shares”).

     

    C. It
      is a
      condition precedent to Vicis’s acquisition of the Preferred Shares that
      Guarantor execute and deliver to Vicis a guaranty in the form hereof. This
      is
      the Guaranty Agreement referred to in the Securities Purchase
      Agreement.

     

    AGREEMENTS

     

    In
      consideration of the recitals and for other good and valuable consideration,
      the
      receipt and sufficiency of which are hereby acknowledged, Guarantor hereby
      agrees with Vicis as follows:

     

    ARTICLE
      I

    DEFINITIONS

     

    When
      used
      in this Guaranty, capitalized terms shall have the meanings specified in the
      Securities Purchase Agreement, the preamble, the recitals and as
      follows:

     

    Event
      of Default.
“Event
      of Default” shall have the meaning specified in the Securities Purchase
      Agreement.

     

    Guaranty.
      “Guaranty” shall mean this Guaranty, as the same shall be amended from time to
      time in accordance with the terms hereof.

     

    Law.
      “Law”
      shall mean any federal, state, local or other law, rule, regulation or
      governmental requirement of any kind, and the rules, regulations,
      interpretations and orders promulgated thereunder.

     

    Obligations.
      “Obligations” shall mean (a) the redemption of, and payment of dividends on, the
      Preferred Shares, and any renewal, extension or refinancing thereof; and (b)
      all
      debts, liabilities, obligations, covenants and agreements of Issuer and Debtor
      contained in the Transaction Documents.

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    Person.
      “Person”
      shall mean and include an individual, partnership, corporation, trust,
      unincorporated association and any unit, department or agency of
      government.

     

    ARTICLE
      II

    THE
      GUARANTY

     

    2.1 The
      Guaranty.
      Guarantor, for itself, its successors and assigns, hereby unconditionally and
      absolutely guarantees to Vicis the full and complete payment and performance
      when due (whether at stated maturity, by acceleration or otherwise) of each
      of
      the Obligations. This is a guaranty of payment and performance and not of
      collection.

     

    2.2 Waivers
      and Consents.
      

     

    (a) Guarantor
      acknowledges that the obligations undertaken herein involve the guaranty of
      obligations of a Person other than Guarantor and, in full recognition of that
      fact, Guarantor consents and agrees that Vicis may, to the extent permitted
      under the Transaction Documents, at any time and from time to time, without
      notice or demand, and without affecting the enforceability or continuing
      effectiveness hereof: (i) supplement, modify, amend, extend, renew, accelerate
      or otherwise change the time for payment or the other terms of the Obligations
      or any part thereof, including without limitation any decrease of the principal
      amount thereof or the rate(s) of interest thereon; (ii) supplement, modify,
      amend or waive, or enter into or give any agreement, approval or consent with
      respect to, the Obligations or any part thereof, or any of the Transaction
      Documents or any additional security or guaranties, or any condition, covenant,
      default, remedy, right, representation or term thereof or thereunder; (iii)
      accept new or additional instruments, documents or agreements in exchange for
      or
      relative to any of the Transaction Documents or the Obligations or any part
      thereof; (iv) accept partial payments on the Obligations; (v) receive and hold
      additional security or guaranties for the Obligations or any part thereof;
      (vi)
      release, reconvey, terminate, waive, abandon, fail to perfect, subordinate,
      exchange, substitute, transfer and/or enforce any security or guaranties, and
      apply any security and direct the order or manner of sale thereof as Vicis
      in
      its sole and absolute discretion may determine; (vii) release any Person from
      any personal liability with respect to the Obligations or any part thereof;
      (viii) settle, release on terms satisfactory to Vicis or by operation of
      applicable Law or otherwise, liquidate or enforce any Obligations and any
      security or guaranty in any manner, consent to the transfer of any security
      and
      bid and purchase at any sale; and/or (ix) consent to the merger, change or
      any
      other restructuring or termination of the corporate existence of Issuer or
      any
      other Person, and correspondingly restructure the Obligations, and any such
      merger, change, restructuring or termination shall not affect the liability
      of
      Guarantor or the continuing effectiveness hereof, or the enforceability hereof
      with respect to all or any part of the Obligations.

     

    (b) Upon
      the
      occurrence and during the continuance of any Event of Default, Vicis may enforce
      this Guaranty independently of any other remedy, guaranty or security Vicis
      at
      any time may have or hold in connection with the Obligations, and it shall
      not
      be necessary for Vicis to marshal assets in favor of Issuer, any other guarantor
      of the Obligations or any other Person or to proceed upon or against and/or
      exhaust any security or remedy before proceeding to enforce this Guaranty.
      Guarantor expressly waives any right to require Vicis, upon the occurrence
      and
      during the continuance of an Event of Default, to marshal assets in favor of
      Issuer or any other Person or to proceed against Issuer or any other guarantor
      of the Obligations or any collateral provided by any Person, and agrees that
      Vicis may proceed against any obligor and/or the collateral in such order as
      it
      shall determine in its sole and absolute discretion. Vicis may file a separate
      action or actions against Guarantor, whether action is brought or prosecuted
      with respect to any security or against any other Person, or whether any other
      Person is joined in any such action or actions. Guarantor agrees that Vicis
      and
      Issuer may deal with each other in connection with the Obligations or otherwise,
      or alter any contracts or agreements now or hereafter existing between them,
      in
      any manner whatsoever, all without in any way altering or affecting the security
      of this Guaranty.

     

    
      
        
        

      

      
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    (c) The
      rights of Vicis hereunder shall be reinstated and revived, and the
      enforceability of this Guaranty shall continue, with respect to any amount
      at
      any time paid on account of the Obligations which thereafter shall be required
      to be restored or returned by Vicis upon the bankruptcy, insolvency or
      reorganization of any Person, all as though such amount had not been paid.
      The
      rights of Vicis created or granted herein and the enforceability of this
      Guaranty shall remain effective at all times to guarantee the full amount of
      all
      the Obligations even though the Obligations, including any part thereof or
      any
      other security or guaranty therefor, may be or hereafter may become invalid
      or
      otherwise unenforceable as against Issuer or any other guarantor of the
      Obligations and whether or not Issuer or any other guarantor of the Obligations
      shall have any personal liability with respect thereto.

     

    (d) To
      the
      extent permitted by applicable law, Guarantor expressly waives any and all
      defenses now or hereafter arising or asserted by reason of: (i) any disability
      or other defense of Issuer or any other guarantor for the Obligations with
      respect to the Obligations (other than full payment and performance of all
      of
      the Obligations); (ii) the unenforceability or invalidity of any security for
      or
      guaranty of the Obligations or the lack of perfection or continuing perfection
      or failure of priority of any security for the Obligations; (iii) the
      cessation for any cause whatsoever of the liability of Issuer or any other
      guarantor of the Obligations (other than by reason of the full payment and
      performance of all Obligations); (iv) any failure of Vicis to marshal assets
      in
      favor of Issuer or any other Person; (v) any failure of Vicis to give notice
      of
      sale or other disposition of collateral to Issuer or any other Person liable
      for
      the Obligations or any defect in any notice that may be given in connection
      with
      any sale or disposition of collateral; (vi) any failure of Vicis to comply
      with
      applicable Laws in connection with the sale or other disposition of any
      collateral or other security for any Obligation, including, without limitation,
      any failure of Vicis to conduct a commercially reasonable sale or other
      disposition of any collateral or other security for any Obligation; (vii) any
      act or omission of Vicis or others that directly or indirectly results in or
      aids the discharge or release of Issuer or any other guarantor of the
      Obligations, or of any security or guaranty therefor by operation of Law or
      otherwise; (viii) any failure of Vicis to file or enforce a claim in any
      bankruptcy or other proceeding with respect to any Person; (ix) the election
      by
      Vicis, in any bankruptcy proceeding of any Person, of the application or
      non-application of Section 1111(b)(2) of the United States Bankruptcy Code;
      (x)
      any extension of credit or the grant of any lien under Section 364 of the United
      States Bankruptcy Code; (xi) any use of collateral under Section 363 of the
      United States Bankruptcy Code; (xii) any agreement or stipulation with respect
      to the provision of adequate protection in any bankruptcy proceeding of any
      Person; (xiii) the avoidance of any lien or security interest in favor of Vicis
      for any reason; (xiv) any bankruptcy, insolvency, reorganization, arrangement,
      readjustment of debt, liquidation or dissolution proceeding commenced by or
      against any Person, including without limitation any discharge of, or bar or
      stay against collecting, all or any of the Obligations (or any interest thereon)
      in or as a result of any such proceeding; or (xv) any action taken by Vicis
      that
      is authorized by this Section or any other provision of any Transaction
      Document. Until all of the Obligations have been paid in full, Guarantor
      expressly waives all presentments, demands for payment or performance, notices
      of nonpayment or nonperformance, protests, notices of protest, notices of
      dishonor and all other notices or demands of any kind or nature whatsoever
      with
      respect to the Obligations, and all notices of acceptance of this Guaranty
      or of
      the existence, creation or incurrence of new or additional
      Obligations.

     

    
      
        
        

      

      
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    2.3 Condition
      of Issuer.
      Guarantor represents and warrants to Vicis that it has established adequate
      means of obtaining from Issuer, on a continuing basis, financial and other
      information pertaining to the business, operations and condition (financial
      and
      otherwise) of Issuer and its assets and properties. Guarantor hereby expressly
      waives and relinquishes any duty on the part of Vicis (should any such duty
      exist) to disclose to Guarantor any matter, fact or thing related to the
      business, operations or condition (financial or otherwise) of Issuer or its
      assets or properties, whether now known or hereafter known by Vicis during
      the
      life of this Guaranty. With respect to any of the Obligations, Vicis need not
      inquire into the powers of Issuer or agents acting or purporting to act on
      its
      behalf, and all Obligations made or created in good faith reliance upon the
      professed exercise of such powers shall be guaranteed hereby.

     

    2.4 Continuing
      Guaranty.
      This is
      a continuing guaranty and shall remain in full force and effect as to all of
      the
      Obligations until all amounts owing by Issuer to Vicis on the Obligations shall
      have been paid in full.

     

    2.5 Subrogation;
      Subordination.
      Guarantor expressly subordinates and postpones any claim for reimbursement,
      contribution, indemnity or subrogation which Guarantor may have against Issuer
      as a guarantor of the Obligations and any other legal or equitable claim against
      Issuer arising out of the payment of the Obligations by Guarantor or from the
      proceeds of any collateral for this Guaranty, until all amounts owing to Vicis
      under the Obligations shall have been paid in full. In furtherance, and not
      in
      limitation, of the foregoing waiver, until all amounts owing to Vicis under
      the
      Obligations shall have been paid in full, Guarantor hereby agrees that no
      payment by Guarantor pursuant to this Guaranty shall constitute Guarantor a
      creditor of Issuer. Until all amounts owing to Vicis under the Obligations
      shall
      have been paid in full, Guarantor shall not seek any reimbursement from Issuer
      in respect of payments made by Guarantor in connection with this Guaranty,
      or in
      respect of amounts realized by Vicis in connection with any collateral for
      the
      Obligations, and Guarantor expressly subordinates and postpones any right to
      enforce any remedy that Vicis now has or hereafter may have against any other
      Person and waives the benefit of, or any right to participate in, any collateral
      now or hereafter held by Vicis. No claim which any Guarantor may have against
      any other guarantor of any of the Obligations or against Issuer, to the extent
      not subordinated and postponed pursuant to this Section, shall be enforced
      nor
      any payment accepted until the Obligations are paid in full.

     

    
      
        
        

      

      
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    ARTICLE
      III

    REPRESENTATIONS
      AND WARRANTIES OF GUARANTOR

     

    Guarantor
      hereby represents and warrants to Vicis as follows:

     

    3.1 Authorization.
      Guarantor is a corporation duly and validly organized and existing under the
      laws of the State of Delaware, has the corporate power to own its owned assets
      and properties and to carry on its business, and is duly licensed or qualified
      to do business in all jurisdictions in which failure to do so would have a
      material adverse effect on its business or financial condition. The making,
      execution, delivery and performance of this Guaranty, and compliance with its
      terms, have been duly authorized by all necessary corporate action of
      Guarantor.

     

    3.2 Enforceability.
      This
      Guaranty is the legal, valid and binding obligation of Guarantor, enforceable
      against Guarantor in accordance with its terms, except
      (i) as limited by general equitable principles and applicable bankruptcy,
      insolvency, reorganization, moratorium and other laws of general application
      affecting enforcement of creditors’ rights generally, (ii) as limited by laws
      relating to the availability of specific performance, injunctive relief or
      other
      equitable remedies and (iii) insofar as indemnification and contribution
      provisions may be limited by applicable law.

     

    3.3 Absence
      of Conflicting Obligations.
      The
      making, execution, delivery and performance of this Guaranty, and compliance
      with its terms, do not violate any existing provision of Law; the articles
      of
      incorporation or bylaws of Guarantor; or any material agreement or instrument
      to
      which Guarantor is a party or by which it or any of its assets is
      bound.

     

    3.4 Consideration
      for Guaranty.
      Guarantor acknowledges and agrees with Vicis that but for the execution and
      delivery of this Guaranty by Guarantor, Vicis would not have acquired the
      Preferred Shares. Guarantor acknowledges and agrees that the proceeds of the
      sale of the Preferred Shares will result in significant benefit to Guarantor,
      which is either a direct or an indirect wholly-owned subsidiary of Issuer and
      or
      intended beneficiary of such proceeds.

     

    ARTICLE
      IV

    COVENANTS
      OF THE GUARANTOR

     

    4.1 Actions
      by Guarantor.
      Guarantor shall not take or permit any act, or omit to take any act, that would:
      (a) cause Issuer to breach any of the Obligations; (b) intentionally impair
      the
      ability of Issuer to perform any of the Obligations; or (c) cause an Event
      of
      Default under the Securities Purchase Agreement.

     

    4.2 Reporting
      Requirements.
      To the
      extent not disclosed by Issuer in reports required to be filed with the
      Commission pursuant to the Exchange Act, Guarantor shall furnish, or cause
      to be
      furnished, to Vicis such information respecting the business, assets and
      financial condition of Guarantor as Vicis may reasonably request in
      writing.

     

    
      
        
        

      

      
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    ARTICLE
      V

    MISCELLANEOUS

     

    5.1 Expenses
      and Attorneys’ Fees.
      Guarantor shall pay all reasonable fees and expenses incurred by Vicis,
      including the reasonable, documented fees of counsel, in connection with the
      protection or enforcement of its rights under this Guaranty, including without
      limitation the protection and enforcement of such rights in any bankruptcy,
      reorganization or insolvency proceeding involving Issuer or Guarantor, both
      before and after judgment.

     

    5.2 Revocation.
      This is
      a continuing guaranty and shall remain in full force and effect until Vicis
      receives written notice of revocation signed by Guarantor. Upon revocation
      by
      written notice, this Guaranty shall continue in full force and effect as to
      all
      Obligations contracted for or incurred before revocation, and as to them Vicis
      shall have the rights provided by this Guaranty as if no revocation had
      occurred. Any renewal, extension, or increase in the interest rate(s) of any
      such Obligation, whether made before or after revocation, shall constitute
      an
      Obligation contracted for or incurred before revocation. Obligations contracted
      for or incurred before revocation shall also include credit extended after
      revocation pursuant to commitments made before revocation.

     

    5.3 Assignability;
      Successors.
      Guarantor’s rights and liabilities under this Guaranty are not assignable or
      delegable, in whole or in part, without the prior written consent of Vicis.
      The
      provisions of this Guaranty shall be binding upon Guarantor, its successors
      and
      permitted assigns and shall inure to the benefit of Vicis, its successors and
      assigns.

     

    5.4 Survival;
      Termination.
      All
      agreements, representations and warranties made herein or in any document
      delivered pursuant to this Guaranty shall survive the execution and delivery
      of
      this Guaranty and the delivery of any such document. This
      Guaranty automatically shall terminate upon the satisfaction of the Obligations,
      whether by Issuer, Guarantor or any other Person, and thereafter Guarantor
      shall
      have no further liability or obligations hereunder. Upon the termination of
      this
      Guaranty, Vicis shall execute and deliver to Guarantor an acknowledgment of
      the
      termination of this Guaranty and a release of Guarantor from all claims of
      any
      nature arising under this Guaranty.

     

    5.5 Governing
      Law.
      This
      Guaranty and the documents issued pursuant to this Guaranty shall be governed
      by, and construed and interpreted in accordance with, the Laws of the State
      of
      New York applicable to contracts made and wholly performed within such
      state.

     

    5.6 Execution;
      Headings.
      This
      Guaranty may be executed in two or more counterparts, all of which when taken
      together shall be considered one and the same agreement and shall become
      effective when counterparts have been signed by each party and delivered to
      the
      other party, it being understood that both parties need not sign the same
      counterpart. In the event that any signature is delivered by facsimile
      transmission, such signature shall create a valid and binding obligation of
      the
      party executing (or on whose behalf such signature is executed) with the same
      force and effect as if such facsimile signature page were an original thereof.
      The article and section headings in this Guaranty are inserted for convenience
      of reference only and shall not constitute a part hereof.

     

    
      
        
        

      

      
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    5.7 Notices.
      All
      notices, requests and demands to or upon Vicis or Guarantor (to be delivered
      care of Issuer) shall be delivered in the manner set forth in Section 12.6
      of
      the Securities Purchase Agreement.

     

    5.8 Amendment.
      No
      amendment of this Guaranty shall be effective unless in writing and signed
      by
      Guarantor and Vicis.

     

    5.9 Severability.
      Any
      provision of this Guaranty that is prohibited or unenforceable in any
      jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
      such prohibition or unenforceability without invalidating the remaining
      provisions of this Guaranty in such jurisdiction or affecting the validity
      or
      enforceability of any provision in any other jurisdiction.

     

    5.10 Taxes.
      If any
      transfer or documentary taxes, assessments or charges levied by any governmental
      authority shall be payable by reason of the execution, delivery or recording
      of
      this Guaranty, Guarantor shall pay all such taxes, assessments and charges,
      including interest and penalties, and hereby indemnifies Vicis against any
      liability therefor.

     

    5.11 WAIVER
      OF RIGHT TO JURY TRIAL.
      EACH
      OF
      THE PARTIES HERETO IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW,
      ANY RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF ANY
      CONTROVERSY THAT MAY ARISE UNDER THIS GUARANTY.

     

    5.12 SUBMISSION
      TO JURISDICTION; SERVICE OF PROCESS.
      

     

    (a) EACH
      OF
      THE PARTIES TO THIS GUARANTY HEREBY IRREVOCABLY AND UNCONDITIONALLY SUBMITS
      TO
      THE EXCLUSIVE JURISDICTION OF THE STATE AND FEDERAL COURTS LOCATED THE STATE
      AND
      COUNTY OF NEW YORK FOR PURPOSES OF ALL LEGAL PROCEEDINGS ARISING OUT OF OR
      RELATING TO THIS GUARANTY. EACH OF THE PARTIES TO THIS GUARANTY IRREVOCABLY
      WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION THAT SUCH PARTY
      MAY NOW OR HEREAFTER HAVE TO THE LAYING OF THE VENUE OF ANY SUCH PROCEEDING
      BROUGHT IN ANY SUCH COURTS AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN
      ANY
      SUCH COURTS HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.

     

    (b) EACH
      OF
      THE PARTIES TO THIS GUARANTY HEREBY CONSENTS TO SERVICE OF PROCESS BY NOTICE
      IN
      THE MANNER SPECIFIED IN SECTION 12.6 OF THE SECURITIES PURCHASE AGREEMENT
      AND IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION
      SUCH PARTY MAY NOW OR HEREAFTER HAVE TO SERVICE OF PROCESS IN SUCH
      MANNER..

     

    (signature
      page follows)

    


    
      
        
        

      

      
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    IN
      WITNESS WHEREOF the undersigned has executed this Guaranty as of the day and
      year first above written.

    
      	 	 	 
	 	
              XENI
                MEDICAL SYSTEMS, INC.

            
	 
 	 
 	 
 
	
            	By:  	
              /s/
                Howard B.
                Katz 

            
	 	
              
Name: Howard
              B. Katz
              Title: Chief
                Executive Officer

            


    

     

    Signature
      Page to Guaranty

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

       

    

    ACCEPTANCE
      BY VICIS

     

    This
      Guaranty Agreement is accepted by Vicis Capital Master Fund.

    
      	 	 	 
	 	
              
                VICIS
                  CAPITAL MASTER FUND

              

            
	 	 
	 	By:  Vicis
              Capital
              LLC
	 
 	 
 	 
 
	
            	By:  	
              /s/
                Keith W.
                Hughes

            
	 	
              

              Name:
                Keith W. Hughes

              Title:
                Chief Financial Officer

            


    

     

    Acceptance
      Page to Guaranty