SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  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 13d-2 (b)
                                (Amendment No. 1)


                           RITA MEDICAL SYSTEMS, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    76774E103
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                    12/31/01
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

              [ ]    Rule 13d-1(b)

              [ ]    Rule 13d-1(c)

              [X]    Rule 13d-1(d)

                         (Continued on following pages)

                               Page 1 of 13 Pages


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 2 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    SEQUOIA CAPITAL VI
    94-316625
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    CALIFORNIA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    PN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 3 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    SEQUOIA PARTNERS (O)
    94-3166264
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    CALIFORNIA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    PN
--------------------------------------------------------------------------------



---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 4 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    SEQUOIA TECHNOLOGY PARTNERS VI
    94-3166266
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    CALIFORNIA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    PN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 5 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    DONALD VALENTINE
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 6 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    PIERRE LAMOND
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 7 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    MICHAEL MORITZ
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 8 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    THOMAS F STEPHENSON
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 9 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    MARK STEVENS
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 10 of 13 Pages
---------------------------                        -----------------------------
--------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    DOUGLAS LEONE
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |X|
--------------------------------------------------------------------------------
3   SEC USE ONLY


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

    USA
--------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

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

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

    0
--------------------------------------------------------------------------------
10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                            |_|
--------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.0%
--------------------------------------------------------------------------------
12  TYPE OF REPORTING PERSON*

    IN
--------------------------------------------------------------------------------


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 11 of 13 Pages
---------------------------                        -----------------------------

ITEM 1.

         (a)      Name of Issuer:               Rita Medical Systems, Inc.

         (b)      Address of Issuer's
                  Principal Executive Offices:  967 North Shoreline Blvd.
                                                Mountain View, CA 94043


ITEM 2.

         (a)      Name of Persons Filing:       Sequoia Capital VI ("SC VI")
                                                Sequoia Partners (O)  ("SP(O)")
                                                Sequoia Technology Partners VI
                                                  ("STP VI")
                                                Donald Valentine  ("DV")
                                                Pierre Lamond ("PL")
                                                Michael Moritz ("MM")
                                                Douglas Leone  ("DL")
                                                Mark Stevens  ("MS")
                                                Thomas F. Stephenson  ("TFS")

         (b)      Address of Principal Business
                  Office or, if none, Residence:
                                                3000 Sand Hill Road, 4-180
                                                Menlo Park, CA  94025

         (c)      Citizenship:  PL, MM, DL, DV, MS, TFS:  USA SP(O),  SC VI, STP
                                VI: California

         (d)      Title of Class of Securities: Common

         (e)      CUSIP Number: 76774E103


ITEM 3. If this  statement  is filed  pursuant to Rules  13d-1(b),  or 13d-2(b),
        check whether the person filing is a:


                                 NOT APPLICABLE

ITEM 4. Ownership

                      SEE ROWS 5 THROUGH 11 OF COVER PAGES




---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 12 of 13 Pages
---------------------------                        -----------------------------

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. [X]

                  Instruction.  Dissolution  of a group  requires a response  to
           this item.

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 ON BY THE PARENT HOLDING COMPANY


                                 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


           (The  following  certification  shall be included if the statement is
           filed pursuant to Rule 13d-1(b):]


           By signing  below I certify  that,  to the best of my  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.


---------------------------                        -----------------------------
CUSIP NO. 76774E103                  13 G                  Page 13 of 13 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.





Dated:  February 7, 2002

SEQUOIA CAPITAL VI
By its General Partner
Sequoia Partners (O)



-------------------------------
Michael Moritz, General Partner


Sequoia Technology Partners VI


-------------------------------
Donald Valentine


-------------------------------
Pierre Lamond


-------------------------------
Thomas F. Stephenson


-------------------------------
Michael Moritz


-------------------------------
Mark Stevens