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                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549

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                                  SCHEDULE 13G
                                 (RULE 13d-102)


           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
                           RULES 13D-1(B), (C) AND (D)
               AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2




                                  ABIOMED, Inc.
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                                (Name of Issuer)


                     Common Stock, par value $0.01 per share
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                         (Title of Class of Securities)


                                    003654100
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                                 (CUSIP Number)



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             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
13G is filed:

         [_] Rule 13d-1 (b)
         [X] Rule 13d-1 (c)
         [_] Rule 13d-1 (d)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which could alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
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CUSIP NO. 003654100                SCHEDULE 13G                PAGE 2 OF 6 PAGES
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  1.      NAME OF REPORTING PERSONS.
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

          Dr. David M. Lederman, husband of Ms. Natalie F. Lederman
--------- ----------------------------------------------------------------------
  2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
          (a)  [_]
          (b)  [_]
--------- ----------------------------------------------------------------------
  3.      SEC USE ONLY


--------- ----------------------------------------------------------------------
  4.      CITIZENSHIP OR PLACE OF ORGANIZATION:

          United States
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                         5.   SOLE VOTING POWER:

                              939,000
                       ------ --------------------------------------------------
NUMBER                   6.   SHARED VOTING POWER:
OF SHARES
BENEFICIALLY                  0
OWNED BY               ------ --------------------------------------------------
EACH                     7.   SOLE DISPOSITIVE POWER:
REPORTING
PERSON WITH                   939,000
                       ------ --------------------------------------------------
                         8.   SHARED DISPOSITIVE POWER:

                              0
--------------------------------------------------------------------------------
   9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

          939,000
--------- ----------------------------------------------------------------------
  10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
          (SEE INSTRUCTIONS)
          [X]
--------- ----------------------------------------------------------------------
  11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

          3.56%
--------- ----------------------------------------------------------------------
  12.     TYPE OF REPORTING PERSON: (SEE INSTRUCTIONS)

          IN
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                                Page 2 of 6 Pages

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CUSIP NO. 003654100                SCHEDULE 13G                PAGE 3 OF 6 PAGES
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  1.      NAME OF REPORTING PERSONS.
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

          Ms. Natalie F. Lederman, wife of Dr. David M. Lederman
--------- ----------------------------------------------------------------------
  2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
          (a)  [_]
          (b)  [_]
--------- ----------------------------------------------------------------------
  3.      SEC USE ONLY


--------- ----------------------------------------------------------------------
  4.      CITIZENSHIP OR PLACE OF ORGANIZATION:

          United States
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                         5.   SOLE VOTING POWER:

                              821,000
                       ------ --------------------------------------------------
NUMBER                   6.   SHARED VOTING POWER:
OF SHARES
BENEFICIALLY                  0
OWNED BY               ------ --------------------------------------------------
EACH                     7.   SOLE DISPOSITIVE POWER:
REPORTING
PERSON WITH                   821,000
                       ------ --------------------------------------------------
                         8.   SHARED DISPOSITIVE POWER:

                              0
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   9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

          821,000
--------- ----------------------------------------------------------------------
  10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
          (SEE INSTRUCTIONS)
          [X]
--------- ----------------------------------------------------------------------
  11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

          3.12%
--------- ----------------------------------------------------------------------
  12.     TYPE OF REPORTING PERSON: (SEE INSTRUCTIONS)

          IN
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                                Page 3 of 6 Pages


ITEM 1(A).  NAME OF ISSUER:  ABIOMED, Inc.

ITEM 1(B).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
            22 Cherry Hill Drive, Danvers, Massachusetts  01923

ITEM 2(A).  NAME OF PERSON FILING:  Dr. David M. Lederman, husband of Ms.
            Natalie F. Lederman, and Ms. Natalie F. Lederman, wife of Dr. David
            M. Lederman

ITEM 2(B).  ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE:
            P.O. Box 426, Marblehead, Massachusetts  01945

ITEM 2(C).  CITIZENSHIP:  United States

ITEM 2(D).  TITLE OF CLASS OF SECURITIES: Common Stock, par value $0.01 per
                                          share

ITEM 2(E).  CUSIP NO.:  003654100

ITEM 3.     IF THIS STATEMENT IS FILED PURSUANT TO SS.SS. 240.13D-1(b) OR
            240.13-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

            (a) [_]  Broker or dealer registered under section 15 of the Act
                     (15 U.S.C. 78o).

            (b) [_]  Bank as defined in section 3(a)(6) of the Act
                     (15 U.S.C. 78c).

            (c) [_]  Insurance company as defined in section 3(a)(19) of the Act
                     (15 U.S.C. 78c).

            (d) [_]  Investment company registered under section 8 of the
                     Investment Company Act of 1940 (15 U.S.C 80a-8).

            (e) [_]  An investment adviser in accordance with
                     ss.240.13d-1(b)(1)(ii)(E);

            (f) [_]  An employee benefit plan or endowment fund in accordance
                     with ss.240.13d-1(b)(1)(ii)(F);

            (g) [_]  A parent holding company or control person in accordance
                     with ss. 240.13d-1(b)(1)(ii)(G);

            (h) [_]  A savings associations as defined in Section 3(b) of the
                     Federal Deposit Insurance Act (12 U.S.C. 1813);

            (i) [_]  A church plan that is excluded from the definition of an
                     investment company under section 3(c)(14) of the Investment
                     Company Act of 1940 (15 U.S.C. 80a-3);

            (j) [_]  Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).

                                Page 4 of 6 Pages


ITEM 4.     OWNERSHIP

            (a)      Amount Beneficially Owned: Dr. Lederman owns 939,000
                     shares of Common Stock. Ms. Lederman owns 821,000
                     shares of Common Stock. Each of them disclaims
                     beneficial ownership of the shares held by the other.

            (b)      Percent of Class: Dr. Lederman 3.56%; Ms. Lederman 3.12%;
                     Total 6.68%. (Based on Company's Nov 2, 2005 filing of
                     26,341,950 shares outstanding)

            (c)      Number of shares as to which such person has:
                     (i)   Sole power to vote or to direct the vote:
                           Dr. Lederman:       939,000 shares
                           Ms. Lederman:       821,000 shares
                           Total:              1,760,000 shares
                     (ii)  Shared power to vote or direct the vote: 0
                     (iii) Sole power to dispose or to direct the
                           disposition of:
                           Dr. Lederman:       939,000 shares
                           Ms. Lederman:       821,000 shares
                           Total:              1,760,000 shares
                     (iv)  shared power to dispose or to direct the
                           disposition of: 0

ITEM 5.     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

            If this statement is being filed to report the fact that as of the
            date hereof the reporting person has ceased to be the beneficial
            owner of more than five percent of the class of securities, check
            the following [_].

ITEM 6.     OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

            Not Applicable.

ITEM 7.     IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
            THE SECURITY BEING REPORTED BY THE PARENT HOLDING COMPANY OR CONTROL
            PERSON

            Not Applicable.

ITEM 8.     IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

            Not Applicable.

ITEM 9.     NOTICE OF DISSOLUTION OF GROUP

            Not Applicable.

ITEM 10.    CERTIFICATION

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.

                                Page 5 of 6 Pages



                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



                                                     /s/ David M. Lederman
                                                     ---------------------------
                                                     David M. Lederman, Ph.D.


                                                     January 3, 2006
                                                     ---------------------------
                                                     Date





                                                     /s/ Natalie F. Lederman
                                                     ---------------------------
                                                     Natalie F. Lederman


                                                     January 3, 2006
                                                     ---------------------------
                                                     Date



















                                Page 6 of 6 Pages