Exhibit 3.1


                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                                  PROCEPT, INC.


                      Incorporated Pursuant to an Original
                          Certificate of Incorporation
                        filed with the Secretary of State
                           of Delaware on May 8, 1992
                           --------------------------


         The undersigned, for the purpose of amending and restating the
Certificate of Incorporation, as amended, of Procept, Inc. (the "Corporation")
under the laws of the State of Delaware, hereby certifies as follows:

         FIRST: The name of the Corporation is Procept, Inc.

         SECOND: The address of the Corporation's registered office in the State
of Delaware is Corporation Trust Center, 1209 Orange Street, City of Wilmington,
County of New Castle, State of Delaware. The name of its registered agent at
such address is The Corporation Trust Company.

         THIRD: The nature of the business or purposes to be conducted or
promoted are:

         To engage in any lawful act or activity for which corporations may be
organized under the General Corporation Law of Delaware.

         In general, to possess and exercise all the powers and privileges
granted by the General Corporation Law of Delaware or by any other law of
Delaware or by this Restated Certificate of Incorporation, together with any
powers incidental thereto, so far as such powers and privileges are necessary or
convenient to the conduct, promotion or attainment of the business or purposes
of the Corporation.

         FOURTH: The total number of shares of stock which the Corporation shall
have authority to issue is Thirty Million (30,000,000) shares of Common Stock
with a par value of $0.01 per share and One Million (1,000,000) shares of
Preferred Stock with a par value of $0.01 per share.

         The following is a statement of the designations, preferences, voting
powers, qualifications, special or relative rights and privileges in respect of
the authorized capital stock of the Corporation.

                                 Preferred Stock
                                 ---------------

         The Board of Directors is authorized, subject to limitations prescribed
by law and the provisions of this Article FOURTH, to provide by resolution for
the issuance of the shares of Preferred Stock in one or more series, and by
filing a certificate pursuant to the applicable law of the State of Delaware, to
establish from time to time the number of shares to be included in each such
series, and to fix the designations, powers, preferences and rights of the
shares of each such series and the qualifications, limitations or restrictions
thereof.


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         The authority of the Board of Directors with respect to each series
shall include, but shall not be limited to, determination of the following:

         (a) The number of shares constituting that series and the distinctive
designation of that series;

         (b) The dividend rate, if any, on the shares of that series, whether
dividends shall be cumulative, and if so, from which date or dates, and the
relative rights of priority, if any, of payment of dividends on shares of the
series;

         (c) Whether that series shall have voting rights, in addition to the
voting rights provided by law, and, if so, the terms of such voting rights;

         (d) Whether that series shall have conversion privileges, and, if so,
the terms and conditions of such conversion, including provision for adjustment
of the conversion rate in such events as the Board of Directors shall determine;

         (e) Whether or not the shares of that series shall be redeemable, and
if so, the terms and conditions of such redemption, including the date or dates
upon or after which they shall be redeemable, and the amount per share payable
in case of redemption, which amount may vary under different conditions and at
different redemption dates;

         (f) Whether that series shall have a sinking fund for the redemption or
purchase of shares of that series, and if so, the terms and amount of such
sinking fund;

         (g) The rights of the shares of that series in the event of voluntary
or involuntary liquidation, dissolution or winding up of the Corporation, and
the relative rights of priority, if any, of payment of shares of that series;

         (h) Any other relative rights, preferences and limitations of that
series.

                                  Common Stock
                                  ------------

         The Common Stock is subject to the rights and preferences of the
Preferred Stock as hereinbefore set forth or authorized.

         Subject to the provisions of any applicable law or of the by-laws of
the Corporation, as from time to time amended, with respect to the fixing of a
record date for the determination of stockholders entitled to vote, and except
as otherwise provided herein or by law or by the resolution or resolutions
providing for the issue of any series of Preferred Stock, the holders of
outstanding shares of Common Stock shall have exclusive voting rights for the
election of directors and for all other purposes, each holder of record of
shares of Common Stock being entitled to one vote for each share of Common Stock
standing in his name on the books of the Corporation.

         Subject to the rights of any one or more series of Preferred Stock, the
holders of Common Stock shall be entitled to receive such dividends from time to
time as may be declared by the Board of Directors out of any funds of the
Corporation legally available for the payment of such dividends.


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<PAGE>


         In the event of the liquidation, dissolution, or winding up of the
Corporation, whether voluntary or involuntary, after payment shall have been
made to the holders of the Preferred Stock of the full amount to which they are
entitled, the holders of Common Stock shall be entitled to share ratably
according to the number of shares of Common Stock held by them in all remaining
assets of the Corporation available for distribution to its stockholders.

                                    Issuance
                                    --------

         Subject to the provisions of this Certificate of Incorporation and
except as otherwise provided by law, the shares of stock of the Corporation,
regardless of class, may be issued for such consideration and for such corporate
purposes as the Board of Directors may from time to time determine.

         FIFTH: The Corporation is to have perpetual existence.

         SIXTH: The Board of Directors is expressly authorized to exercise all
powers granted to the Directors by law except insofar as such powers are limited
or denied herein or in the by-laws of the Corporation. In furtherance of such
powers, the Board of Directors shall have the right to make, alter or repeal the
by-laws of the Corporation.

         SEVENTH: Meetings of Stockholders may be held within or without the
State of Delaware, as the by-laws may provide. The books of the Corporation may
be kept outside the State of Delaware at such place or places as may be
designated from time to time by the Board of Directors or in the by-laws of the
Corporation. Elections of Directors need not be by written ballot unless the
by-laws of the Corporation shall so provide.

         EIGHTH: The Corporation shall, to the fullest extent permitted by
Section 145 of the General Corporation Law of the State of Delaware, as amended
from time to time, indemnify each person who was or is a party or is threatened
to be made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, by reason
of the fact that he is or was, or has agreed to become, a director or officer of
the Corporation, or is or was serving, or has agreed to serve, at the request of
the Corporation, as a director, officer or trustee of, or in a similar capacity
with, another corporation, partnership, joint venture, trust or other
enterprise, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him or on his
behalf in connection with such action, suit or proceeding and any appeal
therefrom.

         Indemnification may include payment by the Corporation of expenses in
defending an action or proceeding in advance of the final disposition of such
action or proceeding upon receipt of any undertaking by the person indemnified
to repay such payment if it is ultimately determined that such person is not
entitled to indemnification under this Article, which undertaking may be
accepted without reference to the financial ability of such person to make such
repayments.

         The Corporation shall not indemnify any such person seeking
indemnification in connection with a proceeding (or part thereof) initiated by
such person unless the initiation thereof was approved by the Board of Directors
of the Corporation.


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<PAGE>


         The indemnification rights provided in this Article (i) shall not be
deemed exclusive of any other rights to which those indemnified may be entitled
under any law, agreement or vote of stockholders or disinterested directors or
otherwise, and (ii) shall inure to the benefit of the heirs, executors and
administrators of such persons. The Corporation may, to the extent authorized
from time to time by its Board of Directors, grant indemnification rights to
other employees or agents of the Corporation or other persons serving the
Corporation and such rights may be equivalent to, or greater or less than, those
set forth in this Article.

         NINTH: No director shall be personally liable to the Corporation or its
stockholders for monetary damages for any breach of fiduciary duty by such
director as a director. Notwithstanding the foregoing sentence, a director shall
be liable to the extent provided by applicable law (i) for breach of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for acts
or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) pursuant to Section 174 of the Delaware General
Corporation Law or (iv) for any transaction from which the director derived an
improper personal benefit. If the Delaware General Corporation Law is hereafter
amended to authorize a further limitation or elimination of the liability of
directors or officers, then the liability of a director or officer of the
Corporation shall, in addition to the limitation on personal liability provided
herein, be limited or eliminated to the fullest extent permitted by the Delaware
General Corporation Law, as from time to time amended. No amendment to or repeal
of this Article Ninth shall apply to or have any effect on the liability or
alleged liability of any director or officer of the Corporation for or with
respect to any acts or omissions of such director or officer occurring prior to
such amendment or repeal.

         TENTH: The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Restated Certificate of Incorporation, in
the manner now or hereafter prescribed by statute, and all rights conferred upon
stockholders herein are granted subject to this reservation.


         The amendments and the restatement of the Certificate of Incorporation
herein certified have been approved by the Board of Directors of the Corporation
and duly adopted by the holders of a majority of the outstanding shares of
Common Stock in accordance with the provisions of Sections 242 and 245 of the
General Corporation Law of the State of Delaware.


         Signed this 15th day of July, 1997.



                                                      /s/ Stanley C. Erck
                                                      --------------------------
                                                      Stanley C. Erck, President

Attest:



/s/ Lynnette C. Fallon
-----------------------------
Lynnette C. Fallon, Secretary

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