Specimen Unit Certificate



 Exhibit 4.1 
  


						
	 No. _______
	  	 HEALTHCARE ACQUISITION PARTNERS CORP.
	  	________ UNIT 	(S)
			
	 CUSIP NO. 42224P 20 5
	  	Incorporated under the Laws of the State of Delaware	  	 	 

  
 UNIT(S) CONSISTING OF
ONE SHARE OF COMMON STOCK AND TWO WARRANTS, EACH TO PURCHASE ONE SHARE OF COMMON STOCK 
  
 SEE REVERSE FOR CERTAIN DEFINITIONS 
  
 THIS CERTIFIES THAT
                                        
                                        
                                        
                     IS THE OWNER OF
                                        
                                        
                                        
                                        
             UNIT(S). Each Unit (“Unit”) consists of one (1) share of common stock, par value $.0001 per share (“Common Stock”), of Healthcare Acquisition
Partners Corp., a Delaware corporation (the “Corporation”), and two warrants (the “Warrants”). Each Warrant entitles the holder to purchase one (1) share of Common Stock for $5.00 per share (subject to adjustment). The
Common Sock and Warrants comprising each Unit represented by this certificate are not transferable separately prior to
                    , 2006, unless FTN Midwest Securities Corp. determines that an earlier date is acceptable. The terms of the
Warrants are governed by a Warrant Agreement, dated as of                     , 2006 (the “Warrant Agreement”), between the
Corporation and Mellon Investor Services LLC, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant
Agreement are on file at the office of the Warrant Agent at Newport Office Center VII, 480 Washington Blvd., Jersey City, 07210, and are available to any Warrant holder on written request and without cost. This certificate is not valid unless
countersigned by the Transfer Agent and registered by the Registrar of the Corporation. 
  
 WITNESS the seal of the Corporation and the facsimile signature of its duly authorized officers. 
  
 Dated:                     , 2006 
  

					
	 	  	HEALTHCARE ACQUISITION PARTNERS CORP.	  	 
	 	  	 	  	 
	Secretary	  	CORPORATE SEAL	  	Chief Executive Officer
	 	  	2005	  	 
	 	  	DELAWARE	  	 
	 	  	 	  	 
	Transfer Agent	  	 	  	 








 [REVERSE] 
  
 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations: 
  

							
	 TEN COM
	  	as tenants in common	  	 Unif Gift Min Act - _________
	  	 Custodian _________

				
	 TEN ENT
	  	tenants by the entireties	  	(Cust)	  	 (Minor)

			
	 JT TEN
	  	 as joint tenants with right of survivorship
 and not as tenants in common
	  	 Under Uniform Gifts to Minors
 Act: _____________________
 (State)                


  
 Additional
abbreviations may also be used though not in the above list. 
  
 Healthcare Acquisition Partners Corp. 
  
 The
Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, option or other special rights of each class of stock or series thereof of the Corporation and the
qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the Units represented hereby are issued and shall be held subject to the terms and conditions applicable to the securities underlying and comprising
the Units. 
  
 For Value Received,
                         hereby sell, assign and transfer unto 
  

	
	 PLEASE INSERT SOCIAL SECURITY OR OTHER
 IDENTIFYING NUMBER OF ASSIGNEE

	
	  

  
  

 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) 
  
 Units represented by the within Certificate, and do hereby irrevocably constitute and
appoint                  Attorney, to transfer the said Units on the books of the within named Corporation with full power of substitution in the premises.

  

									
					
	Dated	 	 	 	 	 	By:	 	 
	 	 	 	 	 	 	NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY
CHANGE WHATEVER.

  

			
	Signature(s) Guaranteed:
		
	By:	 	 
	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).