MORGENTHALER VENTURE PARTNERS IV
SC 13G/A, 2000-02-11
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                                (Amendment No. 2)




                        CardioThoracic Systems, Inc.
  -----------------------------------------------------------------------------
                                (Name of Issuer)



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


                                  141907-10 5
  -----------------------------------------------------------------------------
                                 (Cusip Number)




Check the following 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).





                      (Continued on the following page(s)

                                 Page 1 of


<PAGE>   2
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-105                                                                 PAGE 2 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Venture Partners IV       34-1807476                                                |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  Delaware                                                                                         |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     0                                                           |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   3
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 3 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Management Partners IV       34-1807474                                             |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     0                                                           |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>   4
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 4 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  David T. Morgenthaler  ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |   0                                                             |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   0                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   5
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 5 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |   Robert D. Pavey       ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |   0                                                             |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   0                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   6
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 6 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Robert C. Bellas, Jr.  ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     0                                                           |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   7
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 7 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Gary J. Morgenthaler  ###-##-####                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |   0                                                             |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   0                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   8
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 8 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  John D. Lutsi  ###-##-####                                                                       |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |   United States                                                                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  0                                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   9
                                  Schedule 13G
                                  ------------


Item 1(a). NAME OF ISSUER: CardioThoracic Systems, Inc.

Item 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 10600 North Tantau
           Avenue, Cupertino, CA 95014

Item 2(a). NAMES OF PERSONS FILING: Morgenthaler Venture Partners IV ("MVP IV");
           Morgenthaler Management Partners IV ("MMP IV"), the general
           partner of MVP IV; David T. Morgenthaler, Robert D. Pavey, Robert
           C. Bellas, Jr., Gary J. Morgenthaler, and John D. Lutsi
           (collectively, the "General Partners") are individual general
           partners of MMP IV, the general partner of MVP IV.

Item 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

           The address of the principal business office of MVP IV, MMP IV
           and each of the General Partners is:

           Morgenthaler Venture Partners IV
           50 Public Square
           Suite 2700
           Cleveland, Ohio 44113

Item 2(c). CITIZENSHIP: MVP IV is a limited partnership organized under the laws
           of Delaware and MMP IV is a limited partnership organized under
           the laws of the State of Ohio. Each of the General Partners is a
           United States citizen.


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

Item 2(e). CUSIP NUMBER:    141907 10 5

Item 3.    IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
           CHECK WHETHER THE PERSON FILING IS a:

           (a) [   ]    Broker or Dealer registered under Section 15 of the
                        Securities Exchange Act of 1934 (the "Act").

           (b) [   ]    Bank as defined in Section 3(a)(6) of the Act.

           (c) [   ]    Insurance Company as defined in Section 3(a)( 19) of the
                        Act.

           (d) [   ]    Investment Company registered under Section 8 of the
                        Investment Company Act of 1940.

           (e) [   ]    Investment Advisor registered under Section 203 of the
                        Investment Advisors Act of 1940.

<PAGE>   10

           (f) [   ]    Employee Benefit Plan, Pension Fund which is subject to
                        the provisions of the Employee Retirement Income
                        Security Act of 1974 or Endowment Fund; see Rule
                        13d-1(b)(1)(ii)(f) of the Act.

           (g) [   ]    Parent Holding Company, in accordance with Rule
                        13d-1(b)(ii)(G) of the Act.

           (h) [   ]    Group, in accordance with Rule 13d-1(b)(1)(ii)(H) of the
                        Act.

           Not Applicable.

Item 4.    OWNERSHIP.

           (a)  Amount Beneficially Owned:

                None

           (b)  Percent of Class:

                None

<PAGE>   11

          (c)  Number of shares as to which such person has:

                 (i) sole power to vote or to direct the vote:

                     None

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

                     None

               (iii) sole power to dispose or direct the disposition of:

                     None


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

                     None


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

          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.

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.
<PAGE>   12

Item 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

          Not Applicable.

Item 9.   NOTICE OF DISSOLUTION OF GROUP.

          Not Applicable.

Item 10.  CERTIFICATION.

          Not Applicable. This statement on Schedule 13G is not 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 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 purposes or effect.



<PAGE>   13

                                   SIGNATURES
                                   ----------


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


Date:   February



MORGENTHALER VENTURE PARTNERS IV

By: Morgenthaler Management Partners IV

By:     *
   ----------------------------------------
   General Partner

MORGENTHALER MANAGEMENT PARTNERS IV

By:     *
   ----------------------------------------
   General Partner

        *
   ----------------------------------------
   David T. Morgenthaler

        *
   ----------------------------------------
   Robert D. Pavey

        *
   ----------------------------------------
   Robert C. Bellas, Jr.

        *
   ----------------------------------------
   Gary J. Morgenthaler

        *
   ----------------------------------------
   John D. Lutsi



                         *By: /s/ Theodore A. Laufik
                             ---------------------------------------
                             Theodore A. Laufik
                             Attorney-in-Fact


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