Document:

[FACE OF
CERTIFICATE]

NUMBER

U

SEE
REVERSE FOR CERTAIN DEFINITIONS

HEALTHCARE
ACQUISITION CORP.

UNITS
CONSISTING OF ONE SHARE OF COMMON STOCK AND ONE WARRANT TO PURCHASE ONE SHARE OF
COMMON STOCK

U N I T
S

CUSIP TO
COME

This
Certifies that

is the
owner of ____________ Units.

Each Unit
(“Unit”) consists of one (1) share of common stock, par value $.0001 per share
(“Common Stock”), of Healthcare Acquisition Corp., a Delaware corporation (the
“Company”), and one warrant (the “Warrant”). Each Warrant entitles the holder to
purchase one (1) share of Common Stock for $6.00 per share (subject to
adjustment). Each Warrant will become exercisable on the later of (i) the
Company’s completion of a merger, capital stock exchange, asset acquisition or
other similar business combination and (ii) , 2006, and will expire unless
exercised before 5:00 p.m., New York City Time, on , 2009, or earlier upon
redemption (the “Expiration Date”). The Common Stock and Warrants comprising the
Units represented by this certificate are not transferable separately prior to ,
2005, subject to earlier separation in the discretion of Maxim Group LLC. The
terms of the Warrants are governed by a Warrant Agreement, dated as of , 2005,
between the Company and Continental Stock Transfer & Trust Company, 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 17 Battery Place, New York, New York 10004, 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
Registrar of the Company.

Witness
the facsimile seal of the Company and the facsimile signature of its duly
authorized officers.

By

SECRETARY

[SEAL]

PRESIDENT

COUNTERSIGNED
AND REGISTERED:

CONTINENTAL
STOCK TRANSFER & TRUST COMPANY

TRANSFER
AGENT AND REGISTRAR

BY

AUTHORIZED
SIGNATURE

[REVERSE
OF CERTIFICATE]

Healthcare
Acquisition Corp.

The
Company will furnish without charge to each stockholder who so requests, a
statement of the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the
Company and the qualifications, limitations, or restrictions of such preferences
and/or rights.

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

TEN ENT -
as tenants by the entireties

JT TEN -
as joint tenants with right of survivorship and not as tenants in
common

UNIF GIFT
MIN ACT- (Cust) Custodian (Minor) under Uniform Gifts to Minors Act
(State)

Additional
abbreviations may also be used though not in the above list.

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 Company with full
power of substitution in the premises.

Dated

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:

THE
SIGNATURE(S) MUST 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).Unassociated Document

[FACE OF
CERTIFICATE]

NUMBER

HC

HEALTHCARE
ACQUISITION CORP.

INCORPORATED
UNDER THE LAWS OF THE STATE OF DELAWARE

COMMON
STOCK

SHARES

SEE
REVERSE FOR CERTAIN DEFINITIONS

CUSIP TO
COME

This
Certifies that

is the
owner of _______

FULLY
PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $.0001 EACH OF THE COMMON
STOCK OF

HEALTHCARE
ACQUISITION CORP.

transferable
on the books of the Corporation in person or by duly authorized attorney upon
surrender of this certificate properly endorsed.

This
certificate is not valid unless countersigned by the Transfer Agent and
registered by the Registrar.

Witness
the seal of the Corporation and the facsimile signatures of its duly authorized
officers.

Dated:

SECRETARY

[SEAL]

PRESIDENT

COUNTERSIGNED
AND REGISTERED:

CONTINENTAL
STOCK TRANSFER & TRUST COMPANY

TRANSFER
AGENT AND REGISTRAR

BY

AUTHORIZED
SIGNATURE

[REVERSE
OF CERTIFICATE]

Healthcare
Acquisition Corp.

The
Corporation will furnish without charge to each stockholder who so requests the
powers, designations, preferences and relative, participating, optional 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 shares represented thereby are issued and shall
be held subject to all the provisions of the Certificate of Incorporation and
all amendments thereto and resolutions of the Board of Directors providing for
the issue of shares of Preferred Stock (copies of which may be obtained from the
secretary of the Corporation), to all of which the holder of this certificate by
acceptance hereof assents.

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

TEN ENT -
as tenants by the entireties

JT TEN -
as joint tenants with right of survivorship and not as tenants in
common

UNIF GIFT
MIN ACT- (Cust) Custodian (Minor) under Uniform Gifts to Minors Act
(State)

Additional
abbreviations may also be used though not in the above list.

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)

shares of
the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint ________________ Attorney to transfer the
said stock on the books of the within named Corporation with full power of
substitution in the premises.

Dated

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:

THE
SIGNATURE(S) MUST 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).

The
holder of this certificate shall be entitled to receive funds from the trust
fund only in the event of the Company’s liquidation or if the holder seeks to
convert his respective shares into cash upon a business combination which he
voted against and which is actually completed by the Company. In no other
circumstances shall the holder have any right or interest of any kind in or to
the trust fund.[FACE OF
CERTIFICATE]

NUMBER

HCW

(THIS
WARRANT WILL BE VOID IF NOT EXERCISED PRIOR TO 5:00 P.M. NEW YORK CITY TIME, ,
2009)

HEALTHCARE
ACQUISITION CORP.

WARRANT

WARRANTS

CUSIP TO
COME

THIS
CERTIFIES THAT, for value received _____________

is the
registered holder of a Warrant or Warrants expiring , 2009 (the “Warrant”) to
purchase one fully paid and non-assessable share of Common Stock, par value
$.0001 per share (“Shares”), of Healthcare Acquisition Corp., a Delaware
corporation (the “Company”), for each Warrant evidenced by this Warrant
Certificate. The Warrant entitles the holder thereof to purchase from the
Company, commencing on the later of (i) the Company’s completion of a merger,
capital stock exchange, asset acquisition or other similar business combination
and (ii) , 2006, such number of Shares of the Company at the price of $6.00 per
share, upon surrender of this Warrant Certificate and payment of the Warrant
Price at the office or agency of the Warrant Agent, Continental Stock Transfer
& Trust Company (such payment to be made by check made payable to the
Warrant Agent), but only subject to the conditions set forth herein and in the
Warrant Agreement between the Company and Continental Stock Transfer & Trust
Company. The Warrant Agreement provides that upon the occurrence of certain
events the Warrant Price and the number of Warrant Shares purchasable hereunder,
set forth on the face hereof, may, subject to certain conditions, be adjusted.
The term Warrant Price as used in this Warrant Certificate refers to the price
per Share at which Shares may be purchased at the time the Warrant is
exercised.

No
fraction of a Share will be issued upon any exercise of a Warrant. If the holder
of a Warrant would be entitled to receive a fraction of a Share upon any
exercise of a Warrant, the Company shall, upon such exercise, round up to the
nearest whole number the number of Shares to be issued to such
holder.

Upon any
exercise of the Warrant for less than the total number of full Shares provided
for herein, there shall be issued to the registered holder hereof or his
assignee a new Warrant Certificate covering the number of Shares for which the
Warrant has not been exercised.

Warrant
Certificates, when surrendered at the office or agency of the Warrant Agent by
the registered holder hereof in person or by attorney duly authorized in
writing, may be exchanged in the manner and subject to the limitations provided
in the Warrant Agreement, but without payment of any service charge, for another
Warrant Certificate or Warrant Certificates of like tenor and evidencing in the
aggregate a like number of Warrants.

Upon due
presentment for registration of transfer of the Warrant Certificate at the
office or agency of the Warrant Agent, a new Warrant Certificate or Warrant
Certificates of like tenor and evidencing in the aggregate a like number of
Warrants shall be issued to the transferee in exchange for this Warrant
Certificate, subject to the limitations provided in the Warrant Agreement,
without charge except for any applicable tax or other governmental
charge.

The
Company and the Warrant Agent may deem and treat the registered holder as the
absolute owner of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any
exercise hereof, of any distribution to the registered holder, and for all other
purposes, and neither the Company nor the Warrant Agent shall be affected by any
notice to the contrary.

This
Warrant does not entitle the registered holder to any of the rights of a
stockholder of the Company.

The
Company reserves the right to call the Warrant, with the prior consent of Maxim
Group LLC, Inc., at any time prior to its exercise, with a notice of call in
writing to the holders of record of the Warrant, giving 30 days’ notice of such
call at any time after the Warrant becomes exercisable if the average closing
sales price of the Shares has been at least $11.50 per share for any 20 trading
days within any 30 trading day period ending on the third business day prior to
the date on which notice of such call is given. The call price of the Warrants
is to be $.01 per Warrant. Any Warrant either not exercised or tendered back to
the Company by the end of the date specified in the notice of call shall be
canceled on the books of the Company and have no further value except for the
$.01 call price.

By

COUNTERSIGNED

CONTINENTAL
STOCK TRANSFER & TRUST COMPANY

AS
WARRANT AGENT

BY:

AUTHORIZED
OFFICER

[SEAL]

PRESIDENT

SECRETARY

[REVERSE
OF CERTIFICATE]

SUBSCRIPTION
FORM

To Be
Executed by the Registered Holder in Order to Exercise Warrants

The
undersigned Registered Holder irrevocably elects to exercise Warrants
represented by this Warrant Certificate, and to purchase the shares of Common
Stock issuable upon the exercise of such Warrants, and requests that
Certificates for such shares shall be issued in the name of

(PLEASE
TYPE OR PRINT NAME AND ADDRESS)

(SOCIAL
SECURITY OR TAX IDENTIFICATION NUMBER)

and be
delivered to

(PLEASE
PRINT OR TYPE NAME AND ADDRESS)

and, if
such number of Warrants shall not be all the Warrants evidenced by this Warrant
Certificate, that a new Warrant Certificate for the balance of such Warrants be
registered in the name of, and delivered to, the Registered Holder at the
address stated below:

Dated:

(SIGNATURE)

(ADDRESS)

(TAX
IDENTIFICATION NUMBER)

ASSIGNMENT

To Be
Executed by the Registered Holder in Order to Assign Warrants

For Value
Received, hereby sell, assign, and transfer unto

(PLEASE
TYPE OR PRINT NAME AND ADDRESS)

(SOCIAL
SECURITY OR TAX IDENTIFICATION NUMBER)

and be
delivered to

(PLEASE
PRINT OR TYPE NAME AND ADDRESS)

of the
Warrants represented by this Warrant Certificate, and hereby irrevocably
constitute and appoint ________________ Attorney to transfer this Warrant
Certificate on the books of the Company, with full power of substitution in the
premises.

Dated:

(SIGNATURE)

THE
SIGNATURE TO THE ASSIGNMENT OF THE SUBSCRIPTION FORM MUST CORRESPOND TO THE NAME
WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY PARTICULAR, WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND MUST BE GUARANTEED BY A
COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM OF THE AMERICAN STOCK
EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR CHICAGO STOCK
EXCHANGE.

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