GENERAL SURGICAL INNOVATIONS INC
SC 13G/A, 1998-02-11
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                          

                                  SCHEDULE 13G







                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


                       General Surgical Innovations, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    371013103
- --------------------------------------------------------------------------------
                                 (CUSIP Number)



Check here if a fee is being paid with this  statement:  (A fee is not  required
only if the  filing  person:  (1) has a  previous  statement  on file  reporting
beneficial  ownership  of more than  five  percent  of the  class of  securities
described in Item 1; and (2) has filed no amendment subsequent thereto reporting
beneficial ownership of five percent or less of such class.) (See Rule 13d-7).

*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  would  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).


                                PAGE 1 OF 8 PAGES


<PAGE>

<TABLE>
<CAPTION>

     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   371013103                                    13G                    Page  2  of  8  Pages
- ---------------------------------------                                         --------------------------------------

- --------- ---------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Mutual Life Insurance Company
          I.R.S. No. 04-1414660

- --------- ---------------------------------------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY


- --------- ---------------------------------------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts

- --------- ---------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-


                   -------- ------------------------------------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-


                   -------- ------------------------------------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-


                   -------- ------------------------------------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ---------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None, except through its indirect,  wholly-owned  subsidiary,  Hancock
          Venture Partners, Inc.


- --------- ---------------------------------------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.


- --------- ---------------------------------------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IC, IA, HC

- --------- ---------------------------------------------------------------------------------------------------------------
                                       *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                                 PAGE 2 OF 8 PAGES


<PAGE>


     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   371013103                                    13G                    Page  3  of  8  Pages
- ---------------------------------------                                         --------------------------------------

- --------- ---------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Subsidiaries, Inc.
          I.R.S. No. 04-2687223

- --------- ---------------------------------------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY


- --------- ---------------------------------------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------- ---------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-


                   -------- ------------------------------------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-


                   -------- ------------------------------------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-


                   -------- ------------------------------------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ---------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          799,640 through its direct,  wholly-owned subsidiary,  Hancock Venture
          Partners, Inc.

- --------- ---------------------------------------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          6.0 %


- --------- ---------------------------------------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC

- --------- ---------------------------------------------------------------------------------------------------------------
                                       *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                                 PAGE 3 OF 8 PAGES


<PAGE>


     <S>                                                                             <C>
- ---------------------------------------                                         --------------------------------------
CUSIP No.   371013103                                    13G                    Page  4  of  8  Pages
- ---------------------------------------                                         --------------------------------------

- --------- ---------------------------------------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Hancock Venture Partners, Inc.
          I.R.S. No. 04-2765223


- --------- ---------------------------------------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                 (b)  |_|
          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   3      SEC USE ONLY


- --------- ---------------------------------------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------- ---------------------------------------------------------------------------------------------------------------
                   -------- ------------------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 799,640


                   -------- ------------------------------------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each
                            -0-

                   -------- ------------------------------------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  799,640


                   -------- ------------------------------------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

                   -------- ------------------------------------------------------------------------------------------
- --------- ---------------------------------------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          799,640

- --------- ---------------------------------------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A

- --------- ---------------------------------------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          6.0 %


- --------- ---------------------------------------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IA

- --------- ---------------------------------------------------------------------------------------------------------------
                                       *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                                 PAGE 4 OF 8 PAGES
</TABLE>


<PAGE>


         The original  statement  shall be signed by each person on whose behalf
the  statement is filed or his  authorized  representative.  If the statement is
signed  on behalf of a person by his  authorized  representative  other  than an
executive  officer or general  partner of the  filing  person,  evidence  of the
representative's  authority to sign on behalf of such person shall be filed with
the  statement,  provided,  however,  that a power of attorney  for this purpose
which is already on file with the Commission may be  incorporated  by reference.
The name and any title of each person who signs the statement  shall be typed or
printed beneath his signature.

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission.

     Attention:  Intentional  misstatements  or  omissions  of  fact  constitute
Federal criminal violations (See 18 U.S.C. 1001)


         Item 1(a)    Name of Issuer:
                      General Surgical Innovations, Inc.

         Item 1(b)    Address of Issuer's Principal Executive Offices:
                      10460 Bubb Road
                      Cupertino, CA   94304

         Item 2(a)    Name of Person Filing:
                      This filing is made on behalf of John Hancock  Mutual Life
                      Insurance   Company    ("JHMLICO"),    JHMLICO's   direct,
                      wholly-owned subsidiary,  John Hancock Subsidiaries,  Inc.
                      ("JHSI"),  and  JHSI's  wholly-owned  subsidiary,  Hancock
                      Venture Partners, Inc. ("Venture").

         Item 2(b)    Address of the Principal Offices:
                      The  principal  business  offices of JHMLICO  and JHSI are
                      located at John Hancock Place,  P.O. Box 111,  Boston,  MA
                      02117.  The  principal  business  office of Venture is One
                      Financial Center, Boston, Massachusetts 02111.

         Item 2(c)    Citizenship:
                      JHMLICO  was  organized  and exists  under the laws of the
                      Commonwealth  of  Massachusetts.  JHSI  and  Venture  were
                      organized  and  exist  under  the  laws  of the  State  of
                      Delaware.

         Item 2(d)    Title of Class of Securities:
                      Common Stock

         Item 2(e)    CUSIP Number:
                      371013103

         Item 3       If  the  Statement  is  being  filed  pursuant  to  Rule
                      13d-1(b), or 13d-2(b),  check whether the person filing is
                      a:

                      JHMLICO:(c) (X) Insurance Company as defined in ss.3(a)
                                      (19) of the Act.

                              (e) (X) Investment  Adviser  registered
                                      under   ss.203  of  the   Investment
                                      Advisers Act of 1940.

                      JHSI:   (g) (X) Parent Holding Company, in accordance 
                                      with ss.240.13d-1(b)(ii)(G).

                      Venture:(e) (X) Investment Adviser registered under ss.203
                                      of the Investment Advisers Act of 1940.






                                                 PAGE 5 OF 8 PAGES
<PAGE>

         Item 4       Ownership:

                      (a)    Amount Beneficially  Owned:  Venture has beneficial
                             ownership  of  799,640   shares  of  Common  Stock.
                             Venture  is  a  managing  general  partner  of  the
                             general partner of HarbourVest  Partners  IV-Direct
                             Fund L.P.  ("Fund  IV") which  holds  shares of the
                             Issuer.  Venture has sole  beneficial  ownership of
                             the shares held in this partnership.

                             Through  their  parent-subsidiary  relationship  to
                             Venture,  JHMLICO and JHSI have indirect beneficial
                             ownership of the Venture shares.

                      (b)    Percent of Class:  6.0%

                      (c) (i) sole power to vote or to direct the vote:
                                    Venture  has sole power to vote or to direct
                                    the vote of 799,640 shares of Common Stock.

                          (ii)   shared power to vote or to direct the vote: -0-

                          (iii)  sole  power  to  dispose  or to  direct  the
                                disposition of:
                                Venture  has  sole  power to  dispose  or to
                                direct the  disposition of 799,640 shares of
                                Common Stock.

                          (iv)  shared power to dispose or to direct the 
                                disposition of:     -0-

         Item 5       Ownership of Five Percent or Less of a Class:
                      Not applicable.

         Item 6       Ownership of More than Five Percent on Behalf of Another 
                      Person:      See Item 4 above.

         Item 7       Identification  and  Classification  of the  Subsidiary
                      which  Acquired  the  Security  Being  Reported  on by the
                      Parent Holding Company:
                      See Items 3 and 4 above.

         Item 8       Identification and Classification of Members of the Group:
                      Not applicable.

         Item 9       Notice of Dissolution of a Group:
                      Not applicable.

         Item 10      Certification:
                      By signing below the  undersigned  certifies  that, to the
                      best of its knowledge and belief, the securities  referred
                      to above were acquired in the ordinary  course of business
                      and were not  acquired  for the purpose of and do not have
                      the effect of changing or  influencing  the control of the
                      issuer  of  such  securities  and  were  not  acquired  in
                      connection  with or as a  participant  in any  transaction
                      having such purpose or effect.



                                PAGE 6 OF 8 PAGES


<PAGE>


                                                     SIGNATURE

         After  reasonable  inquiry and to the best of its knowledge and belief,
each of the  undersigned  certifies  that  the  information  set  forth  in this
statement is true, complete and correct.

                              
                                    John Hancock Mutual Life Insurance Company
                                    By:      /s/John T. Farady
                                             -----------------------------------
                                    Name:    John T. Farady
Dated: January 24, 1998             Title:   Senior Vice President & Treasurer


                                    John Hancock Subsidiaries, Inc.
                                    By:      /s/John T. Farady
                                             -----------------------------------
                                    Name:    John T. Farady
Dated: January 24, 1998             Title:   Treasurer


                                    Hancock Venture Partners, Inc.
                                    By:      /s/Martha D. Vorlicek
                                             -----------------------------------
                                    Name:    Martha D. Vorlicek
Dated: January 24, 1998             Title:    Managing Director



                                PAGE 7 OF 8 PAGES


<PAGE>


EXHIBIT A
                             JOINT FILING AGREEMENT

     John Hancock  Mutual Life  Insurance  Company,  John Hancock  Subsidiaries,
Inc., and Hancock Venture Partners, Inc. agree that the Schedule 13G, (Amendment
No. 1), to which this  Agreement  is  attached,  relating to the Common Stock of
General Surgical Innovations, Inc. is filed on behalf of each of them.



                                    John Hancock Mutual Life Insurance Company
                                    By:      /s/John T. Farady
                                             -----------------------------------
                                    Name:    John T. Farady
Dated: January 24, 1998             Title:   Senior Vice President & Treasurer


                                    John Hancock Subsidiaries, Inc.
                                    By:      /s/John T. Farady
                                             -----------------------------------
                                    Name:    John T. Farady
Dated: January 24, 1998             Title:   Treasurer


                                    Hancock Venture Partners, Inc.
                                    By:      /s/Martha D. Vorlicek
                                             -----------------------------------
                                    Name:    Martha D. Vorlicek
Dated: January 24, 1998             Title:    Managing Director



                                PAGE 8 OF 8 PAGES





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