INTERWEST PARTNERS V LP
SC 13G/A, 1999-02-10
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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. 2)

                                ArthroCare Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   043136 10 0
- --------------------------------------------------------------------------------
                                 (CUSIP Number)



*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 14 pages


<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO.  043136 10 0                                                                       Page 2 of 14 Pages
           ------------                                                                                        
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                            <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           InterWest Partners V, LP
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           California
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

                                        1,223,638
      NUMBER OF                -------- --------------------------------------------------------------------------------
       SHARES                     6     SHARED VOTING POWER
    BENEFICIALLY 
      OWNED BY                           0                                                                                
   EACH REPORTING              -------- --------------------------------------------------------------------------------  
    PERSON WITH                   7     SOLE DISPOSITIVE POWER                                                            
                                                                                                                          
                                        1,223,638                                                                         
                               -------- --------------------------------------------------------------------------------  
                                  8     SHARED DISPOSITIVE POWER                                                          
                                                                                                                          
                                        0                                                                                 
- ---------- -------------------------------------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,223,638
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

           13.6%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           PN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>

                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 2 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 3 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                            <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           InterWest Management Partners V, L.P.
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           California
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

                                        1,223,638
          NUMBER OF            -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
        BENEFICIALLY 
          OWNED BY                      0
       EACH REPORTING          -------- --------------------------------------------------------------------------------
        PERSON WITH               7     SOLE DISPOSITIVE POWER

                                        1,223,638
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

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

           1,223,638
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

           13.6%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           PN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
                   
</FN>
</TABLE>
                               Page 3 of 14 Pages


<PAGE>
<TABLE>
<CAPTION>

- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 4 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                             <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           Alan W. Crites
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           United States
- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER
                                        
       NUMBER OF                        10,000
        SHARES
     BENEFICIALLY              -------- --------------------------------------------------------------------------------
       OWNED BY                   6     SHARED VOTING POWER
    EACH REPORTING
     PERSON WITH                        1,230,773

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        10,000

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

                                        1,230,773

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

           1,240,773

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

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

           13.8%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 4 of 14 Pages


<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 5 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                             <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           Philip T. Gianos

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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

           United States

- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER
                                        
           NUMBER OF                    0
            SHARES      
         BENEFICIALLY          -------- --------------------------------------------------------------------------------
           OWNED BY               6     SHARED VOTING POWER
        EACH REPORTING  
         PERSON WITH                    1,223,638

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        0

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

                                        1,223,638

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

           1,223,638

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

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

           13.6%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 5 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 6 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                            <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           Wallace R. Hawley

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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


           United States

- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER
                                        
          NUMBER OF                     0
           SHARES       
        BENEFICIALLY           -------- --------------------------------------------------------------------------------
          OWNED BY                6     SHARED VOTING POWER
       EACH REPORTING   
        PERSON WITH                     1,230,773

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        0

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

                                        1,230,773

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

           1,230,773

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

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

           13.7%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 6 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 7 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                            <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           W. Scott Hedrick

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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


           United States

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

          NUMBER OF                     0
           SHARES         
        BENEFICIALLY           -------- --------------------------------------------------------------------------------
          OWNED BY                6     SHARED VOTING POWER
       EACH REPORTING     
        PERSON WITH                     1,230,773

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        0

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

                                        1,230,773

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

           1,230,773

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

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

           13.7%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 7 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 8 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                           <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           W. Stephen Holmes

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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


           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

           NUMBER OF                    0
            SHARES         
         BENEFICIALLY          -------- --------------------------------------------------------------------------------
           OWNED BY               6     SHARED VOTING POWER
        EACH REPORTING     
         PERSON WITH                    1,230,773
 
                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        0

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

                                        1,230,773

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

           1,230,773

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

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

           13.7%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 8 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                        Page 9 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                             <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           Robert R. Momsen

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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


           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER
                                        
          NUMBER OF                     33,100
           SHARES         
        BENEFICIALLY           -------- --------------------------------------------------------------------------------
          OWNED BY                6     SHARED VOTING POWER
       EACH REPORTING     
        PERSON WITH                     1,230,773

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        33,100

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

                                        1,230,773

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

           1,263,873

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

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

           14.1%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 9 of 14 Pages
<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP NO. 043136 10 0                                                                       Page 10 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------
<S>        <C>                                                                                            <C>
- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS


           Arnold L. Oronsky

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]

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

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


           United States

- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER
                     
          NUMBER OF                     0
           SHARES         
        BENEFICIALLY           -------- --------------------------------------------------------------------------------
          OWNED BY                6     SHARED VOTING POWER
       EACH REPORTING     
        PERSON WITH                     1,223,638

                               -------- --------------------------------------------------------------------------------
                                  7     SOLE DISPOSITIVE POWER

                                        0

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

                                        1,223,638

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

           1,223,638

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

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

           13.6%

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

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                               Page 10 of 14 Pages
<PAGE>



Item 1.

(a)      Name of Issuer:  ArthroCare Corporation. ("Issuer")


(b)      Address of Issuer's Principal Executive Offices:

         595 North Pastoria Avenue
         Sunnyvale, CA 94086

Item 2.

(a)      Name of Person(s) Filing:

         InterWest Partners V, L.P. ("IWP V")
         InterWest Management Partners V, L.P. ("IMP V")
         Alan W. Crites ("Crites")
         Philip T. Gianos ("Gianos")
         Wallace R. Hawley ("Hawley")
         W. Scott Hedrick ("Hedrick")
         W. Stephen Holmes ("Holmes")
         Robert R. Momsen ("Momsen")
         Arnold L. Oronsky ("Oronsky")

(b) Address of Principal Business Office or, if none, Residence:

         3000 Sand Hill Road
         Building 3, Suite 255
         Menlo Park, CA 94025

(c)      Citizenship/Place of Organization:

         IWP V:       California
         IMP V:       California
         Crites:      United States
         Gianos:      United States
         Hawley:      United States
         Hedrick:     United States
         Holmes:      United States
         Momsen:      United States
         Oronsky:     United States


 (d)     Title of Class of Securities:  Common Stock

(e)      CUSIP Number:     043136 10 0

Item 3.        Not applicable.

                               Page 11 of 14 Pages


<PAGE>

<TABLE>
Item 4         Ownership.

<CAPTION>
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
                                                                                                       Other
                                                                                                   Individuals
                        IWP V      IMP V       Crites       Gianos       Oronsky       Momsen            *
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
<S>     <C>           <C>        <C>         <C>            <C>          <C>          <C>            <C>
(a)     Beneficial
        Ownership     1,223,638  1,223,638   1,240,773**    1,223,638    1,223,638    1,263,873**    1,230,773**
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
(b)     Percentage
        of Class          13.6%      13.6%         13.8%        13.6%        13.6%          14.1%          13.7%
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
(c)     Sole Voting
        Power         1,223,638  1,223,638        10,000            0            0         33,100              0
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
        Shared
        Voting Power
                              0          0     1,230,773    1,223,638    1,223,638      1,230,773      1,230,773
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
        Sole
        Dispositive
        Power         1,223,638  1,223,638        10,000            0            0         33,100              0
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------
        Shared
        Dispositive
        Power                 0          0     1,230,773    1,223,638    1,223,638      1,230,773      1,230,773
- ------- ------------- ---------- ---------- ------------- ------------ ------------ -------------- -------------

<FN>
*Individuals included in this column are Hawley, Hedrick, and Holmes

**Includes 7,135 shares of Issuer's Common stock held by InterWest  Investors V,
a general partnership,  of which Crites, Hawley,  Hedrick, Holmes and Momsen are
general partners
</FN>
</TABLE>

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

Under certain circumstances set forth in the partnership agreement of IMP V, the
general  partners and/or limited  partners of such partnership have the right to
receive  dividends  from,  or the proceeds from the sale of, the Common Stock of
Issuer beneficially owned by such Partnership.

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

No   reporting   person  is  a  member  of  a  group  as   defined   in  section
240.13d-1(b)(1)(iii)(H) of the Act.

Item 9.        Notice of Dissolution of Group

Not applicable.

Item 10.       Certification

Not applicable

EXHIBITS

A.    Joint Filing Statement

                              Page 12 of 14 Pages
<PAGE>


                                    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.

Date:    February ____, 1999


INTERWEST PARTNERS V, L.P.

By:    InterWest Management Partners V, L.P. 
                                                  ------------------------------
                                                  Alan W. Crites
       By: ----------------------------------     
           General Partner                        ------------------------------
                                                  Philip T. Gianos

INTERWEST MANAGEMENT PARTNERS V, L.P.
                                                  ------------------------------
By:    --------------------------------------     Wallace R. Hawley
       General Partner 
                                                  ------------------------------
                                                  W. Scott Hedrick

                                                  ------------------------------
                                                  W. Stephen Holmes

                                                 ------------------------------
                                                  Robert R. Momsen

                                                 ------------------------------
                                                  Arnold L. Oronsky

       
                               Page 13 of 14 Pages


<PAGE>


                                    EXHIBIT A

We, the undersigned, hereby express our agreement that the attached Schedule 13G
is filed on behalf of each of us.

Date:    February ____, 1999


INTERWEST PARTNERS V, L.P.


By:    InterWest Management Partners V, L.P.      ------------------------------
                                                  Alan W. Crites
       By: -----------------------------------                   
           General Partner                        ------------------------------
                                                  Philip T. Gianos
INTERWEST MANAGEMENT PARTNERS V, L.P.           
                                                  ------------------------------
By: --------------------------------------        Wallace R. Hawley
       General Partner
                                                  ------------------------------
                                                  W. Scott Hedrick

                                                  ------------------------------
                                                  W. Stephen Holmes

                                                  ------------------------------
                                                  Robert R. Momsen

                                                  ------------------------------
                                                  Arnold L. Oronsky


                               Page 14 of 14 Pages




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