EXOGEN INC
SC 13D, 1998-02-17
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  Schedule 13D
                                 (Rule 13d-101)

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (Amendment No._______)*



                                  Exogen, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                   0003020921
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

 James R. Bochnowski, 3000 Sand Hill Road, Menlo Park, CA 94025, (650) 854-9650
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                October 20, 1997
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


If the person has  previously  filed a statement  on Schedule  13G to report the
acquisition  which is the  subject  of this  Schedule  13D,  and is filing  this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [X].

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*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
disclosures provided in a prior cover page.

The information required on 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 15 Pages
                            Exhibit Index on Page 15
<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 2 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi Ventures II, L.P. ("DV II")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

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

4           SOURCE OF FUNDS*
                     WC of DMP II
- ----------- --------------------------------------------------------------------------------------------------------

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                         443,439 shares, except that DMP II, the general partner of DV II, and
           BENEFICIALLY                      Bochnowski, Douglass, and Lothrop, the general partners of DMP II,
     OWNED BY EACH REPORTING                 may be deemed to have shared power to vote these shares.
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             443,439 shares, except that DMP II, the  general  partner of DV II, and
                                             Bochnowski,  Douglass, and Lothrop, the general partners of DMP II, may
                                             be deemed to have  shared  power to dispose of these shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                     443,439
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       3.76%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                        *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 3 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi BioInvestments II, L.P. ("DBI II")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

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

4           SOURCE OF FUNDS*
                     WC of DMP II
- ----------- --------------------------------------------------------------------------------------------------------

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                         2,213 shares, except that DMP II, the general partner of DBI II, and
           BENEFICIALLY                      Bochnowski, Douglass,  and Lothrop,  the general partners of DMP II,
     OWNED BY EACH REPORTING                 may be deemed to have shared power to vote these shares.
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             2,213  shares,  except that DMP II, the general  partner of DBI II, and
                                             Bochnowski,  Douglass, and Lothrop, the general  members of DMP II, may
                                             be deemed to have  shared  power to dispose of these shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                   2,213
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                   0.02%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 4 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi Management Partners II, L.P. ("DMP II")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------

4           SOURCE OF FUNDS*
                     N/A
- ----------- --------------------------------------------------------------------------------------------------------

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 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             445,652 shares, of which 443,439 are directly owned by DV II and
                                             2,213 are directly owned by DBI II.  DMP II is the general partner
                                             of DV II and DBI II and may be  deemed to have shared  power to
                                             vote these shares.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER

                                             0 shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             445,652 shares, of which 443,439 are directly owned by DV II and
                                             2,213 are directly owned by DBI II.  DMP II is the general partner of
                                             DV II and DBI II and may be  deemed to have shared  power to dispose of
                                             these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                     445,652
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]

- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       3.78%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 5 of 15 Pages
- ------------------------------------------------------                         -------------------------------------
- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi Ventures III, L.P. ("DV III")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------

4           SOURCE OF FUNDS*
                     WC of DMP III
- ----------- --------------------------------------------------------------------------------------------------------

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                         693,398 shares, except that DMP III, the general partner of DV III,
           BENEFICIALLY                      and Bochnowski, Douglass, and Lothrop, the general members of
     OWNED BY EACH REPORTING                 DMP III, may be deemed to have shared power to vote these shares.
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             693,398  shares,  except  that  DMP , the general partner of DV III,
                                             and Bochnowski, Douglass, and Lothrop, the general members of
                                             DMP  III,  may be  deemed  to  have shared  power to  dispose  of these
                                             shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                     693,398
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       5.88%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>

<TABLE>
<CAPTION>
<S>                                                             <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 6 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi Investments III, L.P. ("DI III")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------

4           SOURCE OF FUNDS*
                     WC of DMP III
- ----------- --------------------------------------------------------------------------------------------------------

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                         12,484 shares, except that DMP III, the general partner of DI III,
           BENEFICIALLY                      and Bochnowski, Douglass, and Lothrop, the general members of
     OWNED BY EACH REPORTING                 DMP III, may be deemed to have shared power to vote these shares.
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             12,484 shares, except that DMP III, general partner of DI III,
                                             and Bochnowski, Douglass, and Lothrop, the general members of
                                             DMP  III,  may be  deemed  to  have shared  power to  dispose  of these
                                             shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                      12,484
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       0.11%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>                                                             <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 7 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------

1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Delphi Management Partners III, L.P. ("DMP III")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------

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

3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------

4           SOURCE OF FUNDS*
                     N/A
- ----------- --------------------------------------------------------------------------------------------------------

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 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             705,882 shares, of which 693,398 are directly owned by DV III and
                                             12,484 are directly owned by DI III.  DMP III is the general partner
                                             of DV III and DI III and may be deemed to have shared power to vote
                                             these shares.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             705,882 shares, of which 693,398 are directly owned by DV III and
                                             12,484 are directly owned by DI III.  DMP III is the general partner
                                             of DV III and DI III and may be deemed to have shared power to
                                             dispose of these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                     705,882
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       5.98%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          PN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>

<TABLE>
<CAPTION>
<S>                                                             <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 8 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              James R. Bochnowski ("Bochnowski")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)   [ ]        (b) [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------

4           SOURCE OF FUNDS*
                     PF
- ----------- --------------------------------------------------------------------------------------------------------

5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)    [ ]

- ----------- --------------------------------------------------------------------------------------------------------

6           CITIZENSHIP OR PLACE OF ORGANIZATION

            U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------

            NUMBER OF               7        SOLE VOTING POWER
              SHARES                         33,045 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Bochnowski, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to vote these
                                             shares.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             33,045 shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Bochnowski, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to dispose of
                                             these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                   1,184,579
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                      10.09%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          IN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 9 of 15 Pages
- ------------------------------------------------------                         -------------------------------------
- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              David Douglass ("Douglass")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a) [ ]          (b) [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
                     PF
- ----------- --------------------------------------------------------------------------------------------------------

5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)      [ ]

- ----------- --------------------------------------------------------------------------------------------------------

6           CITIZENSHIP OR PLACE OF ORGANIZATION

             U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------

            NUMBER OF               7        SOLE VOTING POWER
              SHARES                         12,974 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Douglass, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to vote these
                                             shares.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             20,274 shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Douglass, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to dispose of
                                             these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                   1,164,508
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       9.87%
- ----------- --------------------------------------------------------------------------------------------------------
14          TYPE OR REPORTING PERSON*
                                                                                                          IN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>            <C>
- ------------------------------------------------------                         -------------------------------------
CUSIP NO. 0003020921                                            13 D                    Page 10 of 15 Pages
- ------------------------------------------------------                         -------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                              Donald J. Lothrop ("Lothrop")
                              Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]          (b) [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY

- ----------- --------------------------------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
                     PF
- ----------- --------------------------------------------------------------------------------------------------------

5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)      [ ]

- ----------- --------------------------------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
             U.S. Citizen

- ----------------------------------- -------- -----------------------------------------------------------------------

            NUMBER OF               7        SOLE VOTING POWER
              SHARES                         26,612 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------

                                    8        SHARED VOTING POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Lothrop, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to vote these
                                             shares.
                                    -------- -----------------------------------------------------------------------

                                    9        SOLE DISPOSITIVE POWER
                                             26,612 shares.
                                    -------- -----------------------------------------------------------------------

                                    10       SHARED DISPOSITIVE POWER
                                             1,151,534 shares, of which 1,136,837 are directly owned by DV II and
                                             DV III, and 14,697 are directly owned by DBI II and DI III.  DMP II
                                             is the general partner of DV II and DBI II, DMP III is the general
                                             partner of DV III and DI III, and Lothrop, a general partner of
                                             DMP II and DMP III,  may be  deemed to have shared  power to dispose
                                             of these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------

11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                                                                                   1,178,146
- ----------- --------------------------------------------------------------------------------------------------------

12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
            EXCLUDES CERTAIN SHARES*                                                                     [ ]
- ----------- --------------------------------------------------------------------------------------------------------

13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                                                                                       9.98%
- ----------- --------------------------------------------------------------------------------------------------------

14          TYPE OR REPORTING PERSON*
                                                                                                          IN
- ----------- --------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>

                                                                   Page 11 of 15

                  The event  requiring the filing of this Statement on 13(D) was
                  the  acquisition  on October  20,  1997,  by DV III of 693,398
                  shares of issuer  Common Stock and by DI III of 12,484  shares
                  of issuer Common Stock.  Prior to such acquisition,  ownership
                  of issuer Common Stock was reported annually on Schedule 13(G)
                  pursuant to Section 13(d)(6)(B) of the Securities Exchange Act
                  of 1934, as amended.

ITEM 1.           SECURITY AND ISSUER

                  Common Stock

                  Exogen, Inc.
                  10 Constitution Avenue
                  P.O. Box 6860
                  Piscataway, New Jersey  08855

ITEM 2.           IDENTITY AND BACKGROUND

                  This  Schedule  13D is filed on behalf of Delphi  Ventures II,
                  L.P. ("DV II"),  Delphi  BioInvestments  II, L.P.  ("DBI II"),
                  Delphi  Management   Partners  II,  L.P.  ("DMP  II"),  Delphi
                  Ventures III, L.P. ("DV III"),  Delphi  Investments  III, L.P.
                  ("DI III"),  Delphi Management Partners III, L.P. ("DMP III"),
                  James R.  Bochnowski,  David  Douglass,  and Donald J. Lothrop
                  (collectively, "the Reporting Persons").

                  The  principal  address  for DV II, DBI II, DMP II, DV III, DI
                  III, and DMP III is 3000 Sand Hill Road, Menlo Park, CA 94025.

                  Pursuant to General  Instruction C for Schedule 13D, set forth
                  below is certain information regarding each general partner of
                  DMP II and DMP III.

                  The  General  Partners  of DMP II and  DMP III  are  James  R.
                  Bochnowski,  David Douglass,  and Donald J. Lothrop. Each is a
                  U.S.  citizen  and each of their  principal  occupation  is to
                  serve  as a  general  partner  of  DMP  II and  DMP  III.  The
                  principal business address for Messrs.  Bochnowski,  Douglass,
                  and Lothrop is 3000 Sand Hill Road, Menlo Park, CA 94025.

                  During the last five years,  none of DV II, DBI II, DMP II, DV
                  III, DI III, or DMP III nor any of the  individuals  listed in
                  response  to  Instruction  C,  has  been  (i)  convicted  in a
                  criminal proceeding  (excluding traffic violations and similar
                  misdemeanors)  or (ii) been a party to a civil proceeding of a
                  judicial or administrative body of competent  jurisdiction and
                  as a  result  of  such  proceeding  was  or  is  subject  to a
                  judgment,  decree or final order enjoining  future  violations
                  of, or prohibiting or mandating activities subject to, Federal
                  or State securities laws or finding any violation with respect
                  to such laws.

ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

                  The  aggregate  amount  of  funds  used by DV III to  purchase
                  693,398 shares of Common Stock was  $2,946,941.50.  The source
                  of such funds was the  working  capital of DMP III and no part
                  of the purchase price for the securities consisted of borrowed
                  funds.

                  The  aggregate  amount  of  funds  used by DI III to  purchase
                  12,484 shares of Common Stock was $53,057.  The source of such
                  funds was the  working  capital  of DMP III and no part of the
                  purchase price for the securities consisted of borrowed funds.
<PAGE>
                                                                   Page 12 of 15

ITEM 4.           PURPOSE OF TRANSACTION

                  General  venture  capital  investment.  The Reporting  Persons
                  intend to each review  continuously its or his equity position
                  in  the  issuer.  Depending  upon  future  evaluations  of the
                  business prospects of the issuer and upon other  developments,
                  including,  but not limited to, general  economic and business
                  conditions and money market and stock market  conditions,  the
                  Reporting  Persons may each  determine to increase or decrease
                  its  or  his  equity  interest  in  the  issuer  by  acquiring
                  additional shares of Stock or by disposing of all or a portion
                  of its holdings of Stock,  but subject to any applicable legal
                  and  contractual  restrictions on its ability to do so. Except
                  as set forth herein,  none of the  Reporting  Persons have any
                  plans or  proposals  which would relate to or result in any of
                  the matters described in Items 4(a)-(j).

ITEM 5.           INTEREST IN SECURITIES OF THE ISSUER

                  (a) See cover pages, row 11 for each Reporting Person.

                  (b) See cover pages, rows 7-10 for each Reporting Person.

                  There have been no transactions by any Reporting Person in the
                  last 60 days  from the date of this  Statement  (or  within 60
                  days of the event  requiring  the  filing of  Statement).Under
                  certain  circumstances  set forth in the  limited  partnership
                  agreement  of DV II, DBI II, DMP II, DV III,  DI III,  and DMP
                  III, the general and limited partners of each of such entities
                  may be deemed to have the right to receive  dividends from, or
                  the proceeds  from,  the sale of shares of the issuer owned by
                  each such entity of which they are a partner.

ITEM 6.           CONTRACTS, ARRANGEMENTS,  UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER

                  None of the  Reporting  Persons  is a party  to any  contract,
                  arrangement, understanding or relationship with respect to any
                  securities  of the  Issuer,  including  but not limited to the
                  transfer or voting of any  securities of the Issuer,  finder's
                  fees,  joint ventures,  loan or option  arrangements,  puts or
                  calls, guarantees of profits,  division of profits or loss, or
                  the giving or withholding of proxies. Lothrop is a director of
                  the issuer.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS

                  Exhibit A:  Agreement of Joint Filing

<PAGE>
                                                                   Page 13 of 15

                                   SIGNATURES



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

Dated:  February 13, 1998



                              /s/  James  J.  Bochnowski  
                              --------------------------------------------------
                              James J. Bochnowski,  individually,  and on behalf
                              of DV II and DBI II, in his  capacity as a general
                              partner of DMP II, the general partner of DVII and
                              DBI II,  on  behalf  of DV III and DI III,  in his
                              capacity  as a  general  partner  of DMP III,  the
                              general  partner  of DV  III  and DI  III,  and on
                              behalf of DMP II and DMP III in his  capacity as a
                              general partner of each thereof.


                              /s/ David L. Douglass
                              --------------------------------------------------
                              David L. Douglass


                              /s/ Donald J. Lothrop
                              --------------------------------------------------
                              Donald J. Lothrop


<PAGE>

                                                                   Page 14 of 15

                                  EXHIBIT INDEX
                                  -------------



                                                                    Found on
                                                                  Sequentially
Exhibit                                                           Numbered Page
- -------                                                           -------------

Exhibit A:  Agreement of Joint Filing                                Page 15






<PAGE>
                                                                   Page 15 of 15


                                    EXHIBIT A
                                    ---------


                            Agreement of Joint Filing
                            -------------------------



                  The  undersigned  hereby agree that a single  Schedule 13D (or
any amendment  thereto)  relating to the Common Stock of Exogen,  Inc.  shall be
filed on behalf of each of the  undersigned  and that  this  Agreement  shall be
filed as an exhibit to such Schedule 13D.

Date:  February 13, 1998




                              /s/  James  J.  Bochnowski 
                              --------------------------------------------------
                              James J. Bochnowski,  individually,  and on behalf
                              of DV II and DBI II, in his  capacity as a general
                              partner of DMP II, the general partner of DVII and
                              DBI II,  on  behalf  of DV III and DI III,  in his
                              capacity  as a  general  partner  of DMP III,  the
                              general  partner  of DV  III  and DI  III,  and on
                              behalf of DMP II and DMP III in his  capacity as a
                              general partner of each thereof.



                              /s/ David L. Douglass
                              --------------------------------------------------
                              David L. Douglass



                              /s/ Donald J. Lothrop
                              --------------------------------------------------
                              Donald J. Lothrop










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