

<PAGE>

===============================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                 SCHEDULE 14D-1
                               (AMENDMENT NO. 1)
                            TENDER OFFER STATEMENT
                         PURSUANT TO SECTION 14(D)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

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

                              CIRCON CORPORATION
                           (NAME OF SUBJECT COMPANY)


                             MMI ACQUISITION CORP.
                             MAXXIM MEDICAL, INC.
                             MAXXIM MEDICAL, INC.
                                   (BIDDERS)

                    COMMON STOCK, PAR VALUE $0.01 PER SHARE
                         (TITLE OF CLASS OF SECURITIES)
                                  172736 10 0

                     (CUSIP NUMBER OF CLASS OF SECURITIES)

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

                              KENNETH W. DAVIDSON
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                             MAXXIM MEDICAL, INC.
                            10300 49TH STREET NORTH
                             CLEARWATER, FL 33762
                           TELEPHONE: (727) 561-2100
                           FACSIMILE: (727) 561-2170
          (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED TO
            RECEIVE NOTICES AND COMMUNICATIONS ON BEHALF OF BIDDERS)

                                   COPY TO:
                            MICHAEL E. GIZANG, ESQ.
                   SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                               919 THIRD AVENUE
                              NEW YORK, NY 10022
                           TELEPHONE: (212) 735-3000
                           FACSIMILE: (212) 735-2000

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

                           CALCULATION OF FILING FEE
===============================================================================
TRANSACTION VALUATION* $219,797,445               AMOUNT OF FILING FEE $43,960
===============================================================================

*    Estimated for purposes of calculating the amount of the filing fee only.
     This amount assumes the purchase of 14,653,163 shares of common stock,
     $0.01 par value per share (the "Shares"), of Circon Corporation at a price
     of $15.00 per Share in cash, without interest thereon. Such number of
     Shares represents the 13,440,490 Shares outstanding as of November 20,
     1998, and assumes the issuance prior to the consummation of the Offer of
     1,212,673 Shares upon the exercise or conversion of outstanding stock
     options and warrants. The amount of the filing fee calculated in
     accordance with Regulation 240.0-11 of the Securities Exchange Act of
     1934, as amended, equals 1/50th of one percent of the value of the
     transaction.

[X]  Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
     and identify the filing with which the offsetting fee was previously paid.
     Identify the previous filing by registration statement number, or the Form
     or Schedule and the date of its filing.

     Amount Previously Paid: $43,960
     Form or Registration No.: Schedule 14D-1
     Filing Party: Maxxim Medical, Inc., Maxxim Medical, Inc. and 
                   MMI Acquisition Corp.
     Date Filed: November 30, 1998

===============================================================================
 
<PAGE>

                                     14D-1

---------------------
CUSIP NO. 172736 10 0
---------------------
-------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

      MMI ACQUISITION CORP.
-------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a)  [ ]

                                                                       (b)  [ ]
-------------------------------------------------------------------------------
  3   SEC USE ONLY

 
-------------------------------------------------------------------------------
  4   SOURCE OF FUNDS

      BK
-------------------------------------------------------------------------------
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEM 2(e) OR 2(f)                                         [ ]

-------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      DELAWARE
-------------------------------------------------------------------------------
  7   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      NONE
-------------------------------------------------------------------------------
  8   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES
      CERTAIN SHARES                                                        [ ]

-------------------------------------------------------------------------------
  9   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)

 
-------------------------------------------------------------------------------
 10   TYPE OF REPORTING PERSON

      CO
-------------------------------------------------------------------------------

 

                                       2
<PAGE>

                                     14D-1

---------------------
CUSIP NO. 172736 10 1
---------------------

-------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

      MAXXIM MEDICAL, INC.
-------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a)  [ ]
                                                                       (b)  [ ]

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

-------------------------------------------------------------------------------
  4   SOURCE OF FUNDS

      BK
-------------------------------------------------------------------------------
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEM 2(e) OR 2(f)                                         [ ]

-------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      DELAWARE
-------------------------------------------------------------------------------
  7   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      NONE
-------------------------------------------------------------------------------
  8   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES
      CERTAIN SHARES                                                        [ ]

-------------------------------------------------------------------------------
  9   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
 

-------------------------------------------------------------------------------
  10  TYPE OF REPORTING PERSON

      CO
-------------------------------------------------------------------------------

                                       3
<PAGE>

                                     14D-1

---------------------
CUSIP NO. 172736 10 1
---------------------

-------------------------------------------------------------------------------
  1   NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

      MAXXIM MEDICAL, INC.
-------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a)  [ ]
                                                                       (b)  [ ]

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

-------------------------------------------------------------------------------
  4   SOURCE OF FUNDS

      BK
-------------------------------------------------------------------------------
  5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEM 2(e) OR 2(f)                                         [ ]

-------------------------------------------------------------------------------
  6   CITIZENSHIP OR PLACE OF ORGANIZATION

      TEXAS
-------------------------------------------------------------------------------
  7   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      NONE
-------------------------------------------------------------------------------
  8.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES
      CERTAIN SHARES                                                        [ ]

-------------------------------------------------------------------------------
  9   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)

 
-------------------------------------------------------------------------------
  10  TYPE OF REPORTING PERSON

      CO
-------------------------------------------------------------------------------

 
                                       4
<PAGE>

                                 TENDER OFFER

     This Amendment No. 1 amends and supplements the Tender Offer Statement on
Schedule 14D-1 filed on November 30, 1998 (as amended and supplemented, the
"Statement"), relating to the offer by MMI Acquisition Corp., a Delaware
corporation ("Purchaser"), and a wholly owned subsidiary of Maxxim Medical,
Inc., a Delaware corporation ("Parent"), a wholly owned subsidiary of Maxxim
Medical, Inc., a Texas corporation ("Maxxim"), to purchase all of the
outstanding shares of common stock, par value $0.01 per share (the "Common
Stock"), including the associated preferred stock purchase rights issued
pursuant to the Rights Agreement, dated as of August 14, 1996, by and between
the Company and Chase Mellon Shareholder Services, LLC, as Rights Agent (the
"Rights" and, together with the Common Stock, the `Shares"), of Circon
Corporation, a Delaware corporation (the "Company"), at $15.00 per Share, net
to the seller in cash, without interest thereon, upon the terms and subject to
the conditions set forth in the Offer to Purchase, dated November 30, 1998, and
the related Letter of Transmittal. Unless otherwise indicated, the capitalized
terms used herein shall have the meanings specified in the Statement, including
the Offer to Purchase previously filed as Exhibit (a)(1) thereto.


ITEM 10. ADDITIONAL INFORMATION.

     On December 10, 1998, Maxxim issued a press release announcing that the
waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended, relating to the Offer had expired. The full text of the press
release is attached hereto as Exhibit (a)(10).


ITEM 11. MATERIALS TO BE FILED AS EXHIBITS.

   (a)(1)     Offer to Purchase, dated November 30, 1998.*

   (a)(2)     Letter of Transmittal.*

   (a)(3)     Notice of Guaranteed Delivery.*

   (a)(4)     Letter to Brokers, Dealers, Commercial Banks, Trust Companies
              and Other Nominees.*

   (a)(5)     Letter to Clients for use by Brokers, Dealers, Commercial Banks,
              Trust Companies and Other Nominees.*

   (a)(6)     Guidelines for Certification of Taxpayer Identification Number
              on Substitute Form W-9.*

   (a)(7)     Press Release, dated November 21, 1998.*

   (a)(8)     Press Release, dated November 30, 1998.*

   (a)(9)     Summary Advertisement.*

   (a)(10)    Press Release, dated December 10, 1998.

   (b)(1)     Commitment Letter, dated as of November 21, 1998, by and among
              Maxxim, NationsBank, N.A. and NationsBanc Montgomery Securities
              LLC.*

   (c)(1)     Agreement and Plan of Merger, dated as of November 21, 1998, by
              and among Parent, Purchaser and the Company.*

   (c)(2)     Exclusivity Agreement, dated as of November 17, 1998, by and
              between Maxxim and the Company.*

   (d)        None.

   (e)        Not applicable.

   (f)        None.


----------
* Previously filed.

                                       5
<PAGE>

                                   SIGNATURE


     After due inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this statement is true,
complete and correct.


Dated: December 10, 1998 
                                        MMI ACQUISITION CORP.


                                        By: /s/ KENNETH W. DAVIDSON
                                           ------------------------------------
                                         
                                           Name:  Kenneth W. Davidson
                                           Title: President




                                        MAXXIM MEDICAL, INC.


                                        By: /s/ KENNETH W. DAVIDSON
                                           ------------------------------------
                                         
                                           Name:  Kenneth W. Davidson
                                           Title: Chairman of the Board,
                                                  President and
                                                  Chief Executive Officer




                                        MAXXIM MEDICAL, INC.


                                        By: /s/ KENNETH W. DAVIDSON
                                           ------------------------------------
                                         
                                           Name:  Kenneth W. Davidson
                                           Title: Chairman of the Board,
                                                  President and
                                                  Chief Executive Officer
<PAGE>

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
                                                                                                   SEQUENTIAL
EXHIBIT                                                                                             PAGE NO.
---------------                                                                                   -----------
<S>               <C>                                                                             <C>
  (a)(1)          Offer to Purchase, dated November 30, 1998.*
  (a)(2)          Letter of Transmittal.*
  (a)(3)          Notice of Guaranteed Delivery.*
  (a)(4)          Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other
                  Nominees.*
  (a)(5)          Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust
                  Companies and Other Nominees.*
  (a)(6)          Guidelines for Certification of Taxpayer Identification Number on Substitute
                  Form W-9.*
  (a)(7)          Press Release, dated November 21, 1998.*
  (a)(8)          Press Release, dated November 30, 1998.*
  (a)(9)          Summary Advertisement.*
  (a)(10)         Press Release, dated December 10, 1998.
  (b)(1)          Commitment Letter, dated as of November 21, 1998, by and among Maxxim,
                  NationsBank, N.A. and NationsBanc Montgomery Securities LLC.*
  (c)(1)          Agreement and Plan of Merger, dated as of November 21, 1998, by and among
                  Parent, Purchaser and the Company.*
  (c)(2)          Exclusivity Agreement, dated as of November 17, 1998, by and between
                  Maxxim and the Company.*
    (d)           None.
    (e)           Not applicable.
    (f)           None.
</TABLE>

----------
* Previously filed.
 
