Specimen Warrant Certificate



 Exhibit 4.3 
  

[FORM OF WARRANT CERTIFICATE] 
  
 THIS WARRANT CERTIFICATE (I) CANNOT BE TRANSFERRED OR EXCHANGED PRIOR TO
                 , 2006, UNLESS FTN MIDWEST SECURITIES CORP. DETERMINES THAT AN EARLIER DATE IS ACCEPTABLE, BUT IN NO EVENT PRIOR TO
                 , 2007, UNLESS INCLUDED WITH A SHARE OF COMMON STOCK OF HEALTHCARE ACQUISITION PARTNERS CORP. (THE “COMPANY”) AS PART OF
A UNIT AND (II) CANNOT BE EXERCISED IN WHOLE OR IN PART UNTIL THE LATER OF THE COMPANY’S COMPLETION OF A BUSINESS COMBINATION OR             
    , 2007. 
  
 EXERCISABLE ONLY IF
COUNTERSIGNED BY THE WARRANT 
 AGENT AS PROVIDED HEREIN. 
  
 Warrant Certificate evidencing 
  
 Warrants to Purchase 
  
 Common Stock, par value $.0001 
  
 As described herein. 
  
 HEALTHCARE
ACQUISITION PARTNERS CORP. 
  

			
	 No. _________
	  	 CUSIP No. 42224P 11 4


  
 VOID AFTER 5:00
P.M., NEW YORK TIME, 
 ON            
    , 2011, OR UPON EARLIER REDEMPTION 
  
 This
certifies that
                                        
or registered assigns is the registered holder of
                                       
  warrants to purchase certain securities (each a “Warrant”). Each Warrant entitles the holder thereof, subject to the provisions contained herein and in the Warrant Agreement (as defined below), to purchase from Healthcare
Acquisition Partners Corp., a Delaware corporation (the “Company”), one share of the Company’s Common Stock (each, a “Share”), at the Exercise Price set forth below. The exercise price of each Warrant (the “Exercise
Price”) shall be $5.00 initially, subject to adjustments as set forth in the Warrant Agreement (as defined below). 
  
 Subject to the terms of the Warrant Agreement, each Warrant evidenced hereby may be exercised in whole but not in part at any time, as specified herein, on any Business
Day (as defined below) occurring during the period (the “Exercise Period”) commencing on the later of the Company’s completion of a Business Combination (as defined below) or
                 , 2007 and ending at 5:00 P.M., New York time, on
                 , 2011 (the “Expiration Date”). Each Warrant remaining unexercised after 5:00 P.M., New York time, on the Expiration Date
shall become void, and all rights of the holder of this Warrant Certificate evidencing such Warrant shall cease. 
  
 The holder of the Warrants represented by this Warrant Certificate may exercise any Warrant evidenced hereby by delivering, not later than 5:00 P.M., New York time, on
any Business Day 








 
during the Exercise Period (the “Exercise Date”) to Mellon Investor Services LLC (the “Warrant Agent”, which term includes any successor
warrant agent under the Warrant Agreement described below) at its stock transfer division at
                                       
 , (i) this Warrant Certificate and the Warrants to be exercised (the “Book-Entry Warrants”) free on the records of The Depository Trust Company (the “Depository”) to an account of the Warrant Agent at the Depository
designated for such purpose in writing by the Warrant Agent to the Depository, (ii) an election to purchase (“Election to Purchase”), properly executed by the holder hereof on the reverse of this Warrant Certificate properly executed
by the institution in whose account the Warrant is recorded on the records of the Depository (the “Participant”), and substantially in the form included on the reverse of hereof and (iii) the Exercise Price for each Warrant to be
exercised in lawful money of the United States of America by certified or official bank check or by bank wire transfer in immediately available funds. If any of (a) this Warrant Certificate or the Book-Entry Warrants, (b) the Election to
Purchase, or (c) the Exercise Price therefor, is received by the Warrant Agent after 5:00 P.M., New York time, on the specified Exercise Date, the Warrants will be deemed to be received and exercised on the Business Day next succeeding the
Exercise Date. If the date specified as the Exercise Date is not a Business Day, the Warrants will be deemed to be received and exercised on the next succeeding day which is a Business Day. If the Warrants to be exercised are received or deemed to
be received after the Expiration Date, the exercise thereof will be null and void and any funds delivered to the Warrant Agent will be returned to the holder as soon as practicable. In no event will interest accrue on funds deposited with the
Warrant Agent in respect of an exercise or attempted exercise of Warrants. The validity of any exercise of Warrants will be determined by the Warrant Agent in its sole discretion and such determination will be final and binding upon the holder of
the Warrants and the Company. Neither the Warrant Agent nor the Company shall have any obligation to inform a holder of Warrants of the invalidity of any exercise of Warrants. 
  
 As used herein, the term “Business Day” means any day that is not a Saturday or Sunday and is not a United States federal holiday
or a day on which banking institutions generally are authorized or obligated by law or regulation to close in New York. 
  
 As used herein, the term “Business Combination” shall mean the acquisition by the Company, whether by merger, capital stock exchange, asset acquisition or other
similar type of combination, of one or more operating businesses in the healthcare-related sector, having, collectively, a fair market value (as calculated in accordance with the Company’s Amended and Restated Certificate of Incorporation) of
at least 80% of the Company’s net assets at the time of such merger, capital stock exchange, asset acquisition or other similar type of combination. 
  
 Warrants may be exercised only in whole numbers of Warrants. If fewer than all of the Warrants evidenced by this Warrant Certificate are exercised, a new Warrant
Certificate for the number of Warrants remaining unexercised shall be executed by the Company and countersigned by the Warrant Agent as provided in Section 1.02 of the Warrant Agreement, and delivered to the holder of this Warrant Certificate
at the address specified on the books of the Warrant Agent or as otherwise specified by such registered holder. 
  
 This Warrant Certificate is issued under and in accordance with the Warrant Agreement, dated as of
                        , 2006 (the “Warrant Agreement”), between the Company and the Warrant Agent and is subject to
the terms and provisions contained in the Warrant Agreement, to all of 








 
which terms and provisions the holder of this Warrant Certificate and the beneficial owners of the Warrants represented by this Warrant Certificate consent
by acceptance hereof. Copies of the Warrant Agreement are on file and can be inspected at the above-mentioned office of the Warrant Agent and at the office of the Company at 350 Madison Avenue, New York, NY 10017. 
  
 At any time during the Exercise Period, the Company may, at its option, redeem all (but not
part) of the then outstanding Warrants upon giving notice in accordance with the terms of the Warrant Agreement (the “Redemption Notice”), at the price of $0.01 per Warrant (the “Redemption Price”); provided, that the last
sales price of the Shares has been at least $8.50 per Share, on each of twenty (20) trading days within any thirty (30) trading day period ending on the third Business Day prior to the date on which the Redemption Notice is given. In the
event the Company shall elect to redeem all the then outstanding Warrants, the Company shall fix a date for such redemption (the “Redemption Date”); provided, that such date shall occur prior to the expiration of the Exercise
Period. The Warrants may be exercised in accordance with the terms of this Agreement at any time after a Redemption Notice shall have been given by the Company pursuant to this Article IV; provided, however, that no Warrants may be
exercised subsequent to the expiration of the Exercise Period; provided, further, that all rights whatsoever with respect to the Warrants shall cease on the Redemption Date, other than to the right to receive the Redemption Price.

  
 The accrual of dividends, if any, on the Shares issued upon the valid exercise
of any Warrant will be governed by the terms generally applicable to such Shares. From and after the issuance of such Shares, the former holder of the Warrants exercised will be entitled to the benefits generally available to other holders of Shares
and such former holder’s right to receive payments of dividends and any other amounts payable in respect of the Shares shall be governed by, and shall be subject to, the terms and provisions generally applicable to such Shares. 
  
 The Exercise Price and the number of Shares purchasable upon the exercise of each Warrant
shall be subject to adjustment as provided pursuant to Section 2.04 of the Warrant Agreement. 
  
 Prior to the Detachment Date, the Warrants represented by this Warrant Certificate may be exchanged or transferred only together with the Shares to which such Warrant is attached (together, a “Unit”), and
only for the purpose of effecting, or in conjunction with, an exchange or transfer of such Unit. Additionally, prior to the Detachment Date, each transfer of such Unit on the register of the Units shall operate also to transfer the Warrants included
in such Units. From and after the Detachment Date, the above provisions shall be of no further force and effect. Upon due presentment for registration of transfer or exchange of this Warrant Certificate at the stock transfer division of the Warrant
Agent, the Company shall execute, and the Warrant Agent shall countersign and deliver, as provided in Section 1.02 of the Warrant Agreement, in the name of the designated transferee one or more new Warrant Certificates of any authorized
denomination evidencing in the aggregate a like number of unexercised Warrants, subject to the limitations provided in the Warrant Agreement. 
  
 Neither this Warrant Certificate nor the Warrants evidenced hereby shall entitle the holder hereof or thereof to any of the rights of a holder of the Shares, including,
without limitation, the right to receive dividends, if any, or payments upon the liquidation, dissolution or winding up of the Company or to exercise voting rights, if any. 







 The Warrant Agreement and this Warrant Certificate may be amended as provided in the Warrant Agreement including, under
certain circumstances described therein, without the consent of the holder of this Warrant Certificate or the Warrants evidenced thereby. 
  
 THIS WARRANT CERTIFICATE AND ALL RIGHTS HEREUNDER AND UNDER THE WARRANT AGREEMENT SHALL BE GOVERNED BY AND INTERPRETED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK APPLICABLE TO CONTRACTS FORMED AND TO BE PERFORMED ENTIRELY WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW PROVISIONS THEREOF TO THE EXTENT SUCH PRINCIPLES OR RULES WOULD REQUIRE OR PERMIT THE APPLICATION OF
THE LAWS OF ANOTHER JURISDICTION. 
  
 This Warrant Certificate shall not be
entitled to any benefit under the Warrant Agreement or be valid or obligatory for any purpose, and no Warrant evidenced hereby may be exercised, unless this Warrant Certificate has been countersigned by the manual signature of the Warrant Agent.

  
 IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed. 
  
 Dated as
of                 , 2006 
  

			
	 HEALTHCARE ACQUISITION PARTNERS CORP.

		
	By:	 	 
	 	 	Authorized Officer


  

			
	 MELLON INVESTOR SERVICES LLC,
 as Warrant
Agent

		
	By:	 	 
	 	 	Authorized Officer








 [REVERSE] 
  
 Instructions for Exercise of Warrant 
  
 To exercise the Warrants evidenced hereby, the holder or Participant must, by 5:00 P.M., New York time, on the specified Exercise Date, deliver to the Warrant Agent at
its stock transfer division, a certified or official bank check or a wire transfer in immediately available funds, in each case payable to the Warrant Agent at Account No.
            , in an amount equal to the Exercise Price in full for the Warrants exercised. In addition, the Warrant holder or Participant must provide the information required
below and deliver this Warrant Certificate to the Warrant Agent at the address set forth below and the Book-Entry Warrants to the Warrant Agent in its account with the Depository designated for such purpose. The Warrant Certificate and this Election
to Purchase must be received by the Warrant Agent by 5:00 P.M., New York time, on the specified Exercise Date. 
  
 ELECTION TO PURCHASE 
 TO BE EXECUTED IF WARRANT HOLDER DESIRES 
 TO EXERCISE THE WARRANTS EVIDENCED HEREBY 
  
 The undersigned hereby irrevocably elects to exercise, on
                    ,              (the “Exercise
Date”),                      Warrants, evidenced by this Warrant Certificate, to purchase, of the shares of Common Stock (each, a
“Share”) of Healthcare Acquisition Partners Corp., a Delaware corporation (the “Company”), and represents that on or before the Exercise Date such holder has tendered payment for such Shares by certified or official bank check or
bank wire transfer in immediately available funds to the order of the Company c/o Mellon Investor Services LLC, [address], in the amount of
$                      in accordance with the terms hereof. The undersigned requests that said number of Shares be in fully registered
form, registered in such names and delivered, all as specified in accordance with the instructions set forth below. 
  
 If said number of Shares is less than all of the Shares purchasable hereunder, the undersigned requests that a new Warrant Certificate evidencing the remaining balance of
the Warrants evidenced hereby be issued and delivered to the holder of the Warrant Certificate unless otherwise specified in the instructions below. 
  
 Dated:                                ,
             

									
					
	Name	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	(Please Print)
				
	 /    /    /    / -
/    /    / - /    /    /    /    /
	 	 	 	Address	 	 
	 (Insert Social Security or Other Identifying Number of Holder)
	 	 	 	 	 	 

  

			
		
	 Signature
	 	 








 This Warrant may only be exercised by presentation to the Warrant Agent at one of the following locations: 
  
 By hand at: 
  
 By mail at: 
  
 The method of delivery of this Warrant Certificate is at the option and risk of the exercising holder and the delivery of this Warrant Certificate will be deemed to be
made only when actually received by the Warrant Agent. If delivery is by mail, registered mail with return receipt requested, properly insured, is recommended. In all cases, sufficient time should be allowed to assure timely delivery. 
  
 (Instructions as to form and delivery of Shares and/or Warrant Certificates)









					
	Name in which Shares are to be registered if other than in the name of the registered holder of this Warrant Certificate:	 	 	 	  
	 	 	 	 	 
			
	Address to which Shares are to be mailed if other than to the address of the registered holder of this Warrant Certificate as shown on the books of the Warrant Agent:	 	 	 	  
			
	  	 	 	 	  
	 	 	 	 	 (Street Address)

			
	  	 	 	 	  
	 	 	 	 	 (City and State) (Zip Code)

			
	 	 	 	 	 Dated:

			
	  	 	 	 	  
	 	 	 	 	 Signature

			
	  	 	 	 	Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate. If Shares, or a Warrant Certificate evidencing unexercised Warrants, are
to be issued in a name other than that of the registered holder hereof or are to be delivered to an address other than the address of such holder as shown on the books of the Warrant Agent, the above signature must be guaranteed by a an Eligible
Guarantor Institution (as that term is defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).
			
	 SIGNATURE GUARANTEE
	 	 	 	 
	 Name of Firm
                                        
                                
	 	 	 	 
	 Address
                                        
                                       
 
	 	 	 	 
	 Area Code and Number
                                        
            
	 	 	 	 
	 Authorized Signature
                                       
                 
	 	 	 	 
	 Name
                                       
                                        
     
	 	 	 	 
	 Title
                                       
                                        
     
	 	 	 	 
	 Dated:                     ,
200     
	 	 	 	 








 ASSIGNMENT 
  
 (FORM OF ASSIGNMENT TO BE EXECUTED IF WARRANT HOLDER 
 DESIRES TO TRANSFER WARRANTS EVIDENCED HEREBY) 
  
 FOR
VALUE RECEIVED,
                                        
                                        
                                        
                                     HEREBY SELL(S), ASSIGN(S) AND
TRANSFER(S) UNTO
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
     
  

					
			
	  	 	 	 	  
	 (Please print name and address
 including zip code of assignee)
	 	 	 	 (Please insert social security or
 other identifying number of assignee)


  
 the rights represented by the within
Warrant Certificate and does hereby irrevocably constitute and appoint
                                 Attorney to transfer said Warrant
Certificate on the books of the Warrant Agent with full power of substitution in the premises. 
  
 Dated: 
  

	
	
	 
	Signature
	(Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate and must bear a signature guarantee by an Eligible Guarantor
Institution (as that term is defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).


  

					
	 SIGNATURE GUARANTEE
	 	 	 	 
	 Name of Firm
                                        
                                
	 	 	 	 
	 Address
                                        
                                       
 
	 	 	 	 
	 Area Code and Number
                                        
            
	 	 	 	 
	 Authorized Signature
                                       
                 
	 	 	 	 
	 Name
                                       
                                        
     
	 	 	 	 
	 Title
                                       
                                        
     
	 	 	 	 
	 Dated:                     ,
200