LIMITED POWER OF ATTORNEY

        The undersigned does hereby appoint each of
Stephen McEvoy, Ian McLeod, Michael Dube and Linda Day, signing
singly, the undersigned's true and lawful attorney-in-fact to:

        (1)     execute for and on behalf of the
undersigned, in the undersigned's capacity as a
director or officer of ABIOMED, Inc. (the "Company"),
Forms 3, 4 and 5 in accordance with Section 16(a) of
the Securities Exchange Act of 1934 and the rules
thereunder;

        (2)     do and perform any and all acts for and on
behalf of the undersigned which may be necessary or
desirable to complete and execute any such Form 3, 4
or 5 and timely file such form with the United States
Securities and Exchange Commission and any stock
exchange or similar authority; and

        (3)     take any other action of any type whatsoever
in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the
undersigned, it being understood that the documents
executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall
be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

        The undersigned hereby grants to each such
attorney-in-fact full power and authority to do and
perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the
undersigned might or could do if personally present,
with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-
fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and
powers herein granted.  The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are
not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section
16 of the Securities Exchange Act of 1934.

        This Power of Attorney shall remain in full force
and effect until the undersigned is no longer required
to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in
securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

        IN WITNESS WHEREOF, this power of attorney has
been executed as of the 31st day of May, 2011 and
shall remain in full force and effect until withdrawn
by the undersigned in writing.

Signature: /s/ Paul Thomas


Print Name: Paul Thomas