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

                                  ___________

                                 SCHEDULE 13G
                                (Rule 13d-102)

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (Amendment No. 1)/1/


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

                   Common Stock, $0.0001 Par Value Per Share
                   -----------------------------------------
                        (Title of Class of Securities)

                                   302092101
                            -----------------------
                                (CUSIP Number)

                                  ___________



_______________________

/1/ 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 in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                              Page 1 of 12 Pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 2 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      James E. Daverman

      ###-##-#### 
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            19,000
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             19,000
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                          744,463
                          
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      763,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.5%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 3 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Marquette Venture Partners II, L.P.

      36-3820302
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware
      
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          723,783
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          723,783

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      723,783

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.1%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 4 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      MVP II Affiliates Fund, L.P.

      36-3871877
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware
      
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          20,680
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          20,680

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      20,680

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      0.2%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 5 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Marquette General II, L.P.

      36-3820303
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware
      
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.3%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 6 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Redfish Partners, L.P. (formerly known as JED Limited Partnership)

      36-3760173
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware
      
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.3%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 7 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Bluefish Partners, L.P. (formerly known as LDR Limited Partnership)

      36-3760176
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware
      
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463

- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.3%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP No. 302092101               13G                    Page 8 of 12 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Lloyd D. Ruth

      ###-##-####
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            34,000
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             34,000
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                          744,463
                          
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      778,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.6%                                                                   

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
 
Item 1(a) Name of Issuer:
          -------------- 

          Exogen, Inc. ("Exogen")

Item 1(b) Address of Issuer's Principal Executive Offices:
          ----------------------------------------------- 

          10 Constitution Avenue
          Piscataway, NJ 08855

Item 2(a) Name of Person Filing:
          --------------------- 

          This Schedule 13G is being jointly filed by each of the following
          persons pursuant to Rule 13d-(1)(f) promulgated by the Securities and
          Exchange Commission pursuant to Section 13 of the Securities Exchange
          Act of 1934, as amended (the "Act"):  (i) Marquette Venture Partners
          II, L.P. ("MVP II"), a Delaware limited partnership, by virtue of its
          direct beneficial ownership of 723,783 shares of common stock, par
          value $0.0001 per share (the "Common Stock"), of Exogen; (ii) MVP II
          Affiliates Fund, L.P. ("MVP II Affiliates"), a Delaware limited
          partnership, by virtue of its direct beneficial ownership of 20,680
          shares of Common Stock; (iii) Marquette General II, L.P. ("MG II"), a
          Delaware limited partnership, as the sole general partner of MVP II
          and MVP II Affiliates; (iv) Redfish Partners, L.P. ("Redfish"), a
          Delaware limited partnership, as a general partner of MG II; (v)
          Bluefish Partners, L.P. ("Bluefish"), a Delaware limited partnership,
          as a general partner of MG II; (vi) James E. Daverman ("Mr.
          Daverman"), as an individual and an affiliate of Redfish; and (vii)
          Lloyd D. Ruth ("Mr. Ruth") as an individual and an affiliate of
          Bluefish. MVP II, MVP II Affiliates, MG II, Redfish, Bluefish, Mr.
          Daverman and Mr. Ruth are hereinafter collectively referred to as the
          "Reporting Persons."

          The Reporting Persons have entered into a Joint Filing Agreement,
          dated February 13, 1997, a copy of which has been previously filed
          with this Schedule 13G, pursuant to which the Reporting Persons have
          agreed to file this statement jointly in accordance with the
          provisions of Rule 13d-1(f)(1) under the Act.

Item 2(b) Address of Principal Business Office or, if none, Residence:
          ------------------------------------------------------------

          The address of the principal business office of each of the Reporting
          Persons is:

          Corporate 500 Centre
          520 Lake Cook Road, Suite 450
          Deerfield, Illinois 60015

                              Page 9 of 12 Pages
<PAGE>
 
Item 2(c) Citizenship
          -----------

          MVP II, MVP II Affiliates, MG II, Redfish and Bluefish are limited
          partnerships organized under the laws of Delaware.
          Mr. Daverman and Mr. Ruth are United States citizens.

Item 2(d) Title of Class of Securities:
          ---------------------------- 

          Common Stock, $0.0001 par value per share.

Item 2(e) CUSIP No.:
          --------- 

          302092101

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

          The persons filing are not described in any category listed under this
          item.

Item 4    Ownership
          ---------

          MG II is the sole general partner of both MVP II and MVP II
          Affiliates; Redfish and Bluefish are the general partners of MG II;
          Mr. Daverman is an affiliate of Redfish; and Mr. Ruth is an affiliate
          of Bluefish. As a result of such relationships, MG II, Redfish,
          Bluefish and both Messrs. Daverman and Ruth may be deemed to share
          voting and dispositive power with respect to the shares held by MVP II
          and MVP II Affiliates. The information on the cover pages is
          incorporated herein by reference.

          Each Reporting Person expressly disclaims beneficial ownership of any
          shares of Common Stock beneficially owned by each other Reporting
          Person.

Item 5    Ownership of Five Percent or Less of a Class:
          -------------------------------------------- 

          If this statement is being filed to report the fact that as of the
          date hereof the reporting person has ceased to be the beneficial owner
          of more than five percent of the class of securities, check the
          following [_].

Item 6    Ownership of More Than Five Percent on Behalf of Another Person:
          --------------------------------------------------------------- 

          No other person has the right to receive or the power to direct the
          receipt of dividends from, or other proceeds from the sale, of the
          shares.

Item 7    Identification and Classification of the Subsidiary Which Acquired the
          Security Being Reported on By the Parent Holding Company:
          ----------------------------------------------------------------------

          Not applicable.

                              Page 10 of 12 Pages
<PAGE>
 
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.


                              Page 11 of 12 Pages
<PAGE>
 
                                   SIGNATURE

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

Date: February 14, 1998

                              MARQUETTE VENTURE PARTNERS II, L.P.

                              MVP II AFFILIATES FUND, L.P.

                              MARQUETTE GENERAL II, L.P.

                              BLUEFISH PARTNERS, L.P.


                              By: /s/ Lloyd D. Ruth
                                  -----------------------------
                                      Lloyd D. Ruth
                                      as authorized signatory


                              REDFISH PARTNERS, L.P.


                              By: /s/ James E. Daverman
                                  -----------------------------
                                      James E. Daverman
                                      as authorized signatory



                              /s/  James E. Daverman
                              ---------------------------------
                              JAMES E. DAVERMAN


                              /s/  Lloyd D. Ruth
                              ---------------------------------
                              LLOYD D. RUTH


                              Page 12 of 12 Pages


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