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                                                                     EXHIBIT 3.1

                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                   HEALTHCO PROFESSIONAL SERVICES CORPORATION

It is hereby certified that:

         1. (a) The present name of the corporation (hereinafter called the
"corporation") is Healthco Professional Services Corporation.

         (b) The name under which the corporation was originally incorporated is
Healthco Professional Leasing Corporation, and the date of filing the original
Certificate of Incorporation of the corporation with the Secretary of State of
the State of Delaware is January 20, 1975.

         2. The Certificate of Incorporation of the corporation is hereby
amended by striking out Articles 1, 2, 4 and 9 thereof and by substituting in
lieu thereof the new Articles 1, 2, 4 and 8 which are set forth in the Restated
Certificate of Incorporation hereinafter provided for.

         3. The provisions of the Certificate of Incorporation of the
corporation as heretofore amended and/or supplemented, and as herein amended,
are hereby restated and integrated into the single instrument which is
hereinafter set forth, and which is entitled Restated Certificate of
Incorporation of HPSC, Inc., without any further amendments other than the
amendments herein certified and without any discrepancy between the provisions
of the Certificate of Incorporation as heretofore amended and supplemented and
the provisions of the said single instrument hereinafter set forth.

         4. The amendments and the restatement of the Certificate of
Incorporation herein certified have been duly adopted by the sole stockholder of
the corporation in accordance with the provisions of Section 242 and of Section
245 of the General Corporation Law of the State of Delaware.

         5. The Certificate of Incorporation of the corporation, as amended and
restated herein, shall, upon the effective date of this Restated Certificate of
Incorporation, read as follows:

                     "Restated Certificate of Incorporation

                                       of
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                                   HPSC, Inc.

         1.       The name of the corporation is HPSC, Inc.

         2. The respective names of the County and of the City within the County
in which the registered office of the corporation is to be located in the State
of Delaware are the County of Kent and the City of Dover. The name of the
registered agent of the corporation is The Prentice-Hall Corporation System,
Inc. The street and number of said registered office and the address by street
and number of said registered agent is 229 South State Street, Dover, Delaware.

         3.       The purposes for which this corporation is organized are:

                   (a)      To manufacture, purchase or otherwise acquire,
                            invest in, own, mortgage, pledge, lease, sell,
                            assign and transfer or otherwise dispose of, trade,
                            deal in and deal with goods, wares and merchandise
                            and personal property of every class and
                            description; and

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

         4. The total number of shares of stock which the corporation shall have
authority to issue is twenty million (20,000,000) shares, consisting of (i) five
million (5,000,000) shares of Preferred Stock, having a par value of $1.00 per
share, and (ii) fifteen million (15,000,000) shares of Common Stock, having a
par value of $.01 per share. Any and all such shares issued, and for which the
full consideration has been paid or delivered, shall be deemed fully paid stock
and the holder of such shares shall not be liable for any further call or
assessment or any other payment thereon.

                   (a)      The shares of Preferred Stock may be divided into
                            and issued in one or more series, and each series
                            shall be designated so as to distinguish the shares
                            thereof from the shares of all other series. All
                            shares of Preferred Stock shall be identical except
                            in respect of particulars which may be fixed by the
                            Board of Directors as hereinafter provided pursuant
                            to authority which is hereby expressly vested in the
                            Board of Directors. Each share of a series shall be
                            identical in all respects with all other shares of
                            such series, except as to the date from which
                            dividends thereon shall be cumulative on any series
                            as to which dividends are cumulative.

                   (b)      Before any shares of Preferred Stock of any series
                            shall be issued, the Board of Directors, pursuant to
                            authority hereby expressly vested in it, shall fix
                            by resolution or resolutions the following
                            provisions in respect of the shares for each such
                            series so far as the same are not inconsistent with
                            the provisions of this Article 4 applicable to all
                            series of Preferred Stock:


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                            (1) The distinctive designations of each such series
                            and the number of shares which shall constitute such
                            series, which number may be increased (except where
                            otherwise provided by the Board of Directors in
                            creating such series) or decreased (but not below
                            the number of shares thereof then outstanding) from
                            time to time by like action of the Board of
                            Directors;

                            (2) the annual rate or amount of dividends payable
                            on shares of such series, whether such dividends
                            shall be cumulative or non-cumulative, the
                            condition, upon which and/or the dates when such
                            dividends shall be payable and the date from which
                            dividends on cumulative series shall accrue and be
                            cumulative on all shares of such series issued prior
                            to the payment date for the first dividend of such
                            series;

                            (3) whether such series shall be redeemable or
                            callable and, if so, the terms and conditions of
                            such redemption or call, including the time or times
                            when and the price or prices at which shares of such
                            series shall be redeemed or called, and including
                            the terms and conditions of any retirement or
                            sinking fund for the purchase or redemption of
                            shares of such series;

                            (4) the amount payable on shares of such series in
                            the event of liquidation, dissolution, or winding up
                            of the affairs of the corporation;

                            (5) whether such series shall be convertible into or
                            exchangeable for shares of any other class, or any
                            series of the same or any other class and, if so,
                            the terms and conditions thereof, including the date
                            or dates when such shares shall be convertible into
                            or exchangeable for shares of any other class, or
                            any series of the same or any other class, the price
                            or prices or the rate or rates at which shares of
                            such series shall be so convertible or exchangeable,
                            and any adjustments which shall be made, and the
                            circumstances in which any such adjustments shall be
                            made, in such conversion or exchange prices or
                            rates;

                            (6) whether such series shall have any voting rights
                            in addition to those prescribed by law and, if so,
                            the terms and conditions of exercise of such voting
                            rights;

                            (7) the conditions and restrictions, if any, on the
                            payment of dividends or on the making of other
                            distributions on, or the purchase, redemption or
                            other acquisition by the corporation or any
                            subsidiary of, the Common Stock or of any other
                            class (or other





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                            series of the same class) ranking junior to the
                            shares of such series as to dividends or upon
                            liquidation, dissolution or winding up;

                            (8) the conditions and restrictions, if any, on the
                            creation of indebtedness of the corporation, or any
                            subsidiary, or on the issue of any additional stock
                            ranking on a parity with or prior to the shares of
                            such series as to dividends or upon liquidation,
                            dissolution or winding up; and

                            (9) such other powers, preferences and relative,
                            participating, optional or other special rights,
                            qualifications, limitations or restrictions as shall
                            not be inconsistent with any such resolution or
                            resolutions previously adopted as to shares then
                            still authorized, with the provisions of this
                            Restated Certificate of Incorporation or with the
                            laws of the State of Delaware.

                   (c)      (1) So long as any shares of Preferred Stock of any
                            series shall be outstanding, the corporation will
                            not declare or pay any dividends on the Common Stock
                            (other than dividends payable solely in shares of
                            Common Stock) or make any distributions of any kind,
                            either directly or indirectly, in respect of shares
                            of Common Stock, or make any payment on account of
                            the purchase, redemption or other acquisition of
                            Common Stock, unless on the payment, distribution or
                            redemption date, as the case may be, all dividends
                            on the then outstanding shares of Preferred Stock of
                            all series for all past dividend periods shall have
                            been paid to the full extent of the preference, if
                            any, to which each series of Preferred Stock is
                            entitled.

                            (2) In case the corporation shall not pay in full
                            all dividends required to be paid on all shares of
                            all series of cumulative Preferred Stock at the time
                            outstanding to the full extent of the preference, if
                            any to which each such cumulative series is
                            entitled, all cumulative series which are of equal
                            rank with respect to such dividend preference shall
                            share ratably in the payment of dividends, including
                            accumulations thereof, if any, in proportion to the
                            amounts that would be payable on such series if all
                            dividends thereof were paid in full. Accumulations
                            of dividends shall not bear interest.

                            (3) After the requirements with respect to
                            preferential dividends (if any) upon all classes of
                            capital stock, and each series thereof, shall have
                            been met, then and not otherwise, the holders of
                            Common Stock shall be entitled to receive such
                            dividends, out of any remaining net profits or net
                            assets of the corporation available there for, when,
                            as and if (subject to the foregoing provisions of
                            this article 4) such dividends may be declared from
                            time to time by the Board of Directors. After
                            distribution in full of the preferential 





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                            amounts to be distributed to the holders of all
                            classes of stock, and each series thereof, having
                            more than parity with Common Stock upon liquidation,
                            dissolution or winding up, then, in the event of the
                            voluntary or involuntary liquidation, dissolution or
                            winding up of the corporation, the holders of the
                            Common Stock shall be entitled to receive all the
                            remaining assets of the corporation available for
                            distribution to its stockholders ratably in
                            proportion to the number of shares of Common Stock
                            held by them respectively.

                            (4) A liquidation, dissolution or winding up of the
                            corporation, as such terms are used in this Article
                            4, or as may be used in any resolution or
                            resolutions of the Board of Directors providing for
                            the issue of any series of this corporation's
                            capital stock, shall not be deemed to be occasioned
                            by or to include:

                            (A)      any consolidation or merger of the
                                     corporation with or into any other
                                     corporation, corporations, entity or
                                     entities, or

                            (B)      any sale, lease, exchange or other transfer
                                     of any or all of the assets of the
                                     corporation to another corporation,
                                     corporations, entity or entities pursuant
                                     to a plan which shall provide for the
                                     receipt by the corporation or its
                                     stockholders, as all or the major portion
                                     of the consideration for such sale, lease,
                                     exchange or transfer, of securities of such
                                     other corporation, corporations, entity or
                                     entities or of any company or companies
                                     subsidiary to, controlled by, or affiliated
                                     with such other corporation, corporations,
                                     entity or entities.

                   (d)      The authorized but unissued shares of Common Stock
                            and the authorized but unissued shares of Preferred
                            Stock of the corporation may be issued for such
                            consideration, having a value, not less than the par
                            value thereof, as is determined from time to time by
                            the Board of Directors.

                   (e)      (1) Except as otherwise determined pursuant to
                            authority of the Board of Directors as hereinbefore
                            provided, or by the General Corporation Law of the
                            State of Delaware, all voting rights shall be vested
                            exclusively in the holders of the outstanding shares
                            of Common Stock and each such holder shall be
                            entitled to one (1) vote per share for all purposes
                            for such share of Common Stock held of record by
                            him.

                            (2) Except as otherwise determined pursuant to
                            authority of the Board of Directors as hereinbefore
                            provided, or by the General 

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                            Corporation Law of the State of Delaware, the
                            holders of Preferred Stock shall not be entitled to
                            vote for any purpose nor shall they be entitled to
                            notice of meetings of stockholders.

                   (f)      The corporation may create and issue securities
                            convertible into shares of capital stock of the
                            corporation, of any class or classes and of any
                            series of any class, and whether or not in
                            connection with the issue and sale of any shares of
                            stock or other securities of the corporation, may
                            create and issue warrants, rights, privileges or
                            options entitling the holders thereof to purchase
                            from the corporation any shares of its capital stock
                            of any class or classes and of any series of any
                            class, such convertible securities, warrants, rights
                            privileges or options to be evidenced by or in such
                            instrument or instruments as shall be approved by
                            the Board of Directors. The terms upon which, the
                            time or times (which may be limited or unlimited in
                            duration) at or within which, and the price or
                            prices at which any such rights to convert, or other
                            warrants, rights, privileges or options may be
                            issued and any such shares may be acquired or
                            purchased from the corporation upon the exercise of
                            any such rights to convert, or other warrant, right,
                            privilege or option shall be such as shall be fixed
                            and stated in a resolution or resolutions adopted by
                            the Board of Directors providing for the creation
                            and issue of such convertible securities, warrants,
                            privileges options, and, in every case, set forth or
                            incorporated by reference in the instrument or
                            instruments evidencing such convertible securities,
                            warrants, rights, privileges or options. In the
                            absence of actual fraud in the transaction, the
                            judgment of the Directors as to the consideration
                            for the issuance of any such convertible security,
                            warrant, right, privilege or option and the
                            sufficiency thereof shall be conclusive. The
                            conversion price, or other consideration to be
                            received by the corporation upon the issuance of
                            shares of capital stock upon the exercise of any
                            such rights to convert, warrant, right, privilege or
                            option shall have a value not less than the par
                            value of the stock so issued, as determined by the
                            Board of Directors.

         5. The corporation is to have perpetual existence.

         6. In furtherance and not in limitation of the power conferred by
statute, the Board of Directors is expressly authorized to make, alter or repeal
the by-laws of the corporation.

         7. 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
(subject to any provision contained in the statutes) 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

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by-laws of the corporation. Elections of Directors need not be by written ballot
unless the by-laws of the corporation shall so provide.

         8. Whenever a compromise or arrangement is proposed between this
corporation and its creditors of any class of them and/or between this
corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this corporation or of any creditor or stockholder thereof, or on the
application of any receiver or receivers appointed for this corporation under
the provisions of Section 291 of Title 8 of the Delaware Code, or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this corporation under the provisions of Section 279 of Title 8 of the
Delaware Code, order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders of this corporation, as the case may
be, to be summoned in such manner as the said court directs. If a majority in
number representing three-fourths in value of the creditors or class of
creditors and/or of the stockholders or class of stockholders of this
corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this corporation as a consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors and/or on all the
stockholders or class of stockholders of this corporation, as the case may be,
and also on this corporation.

         Signed and attested to on April 21, 1983.

CORPORATE
SEAL

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


- ---------------------------
Its Secretary











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COMMONWEALTH OF MASSACHUSETTS)
                             ) ss.

COUNTY OF SUFFOLK            )

         BE IT REMEMBERED that, on April 21, 1983, before me, a Notary Public
duly authorized by law to take acknowledgment of deeds, personally came
___________, _________________ of HPSC, Inc., who duly signed the foregoing
instrument before me and acknowledged that such signing is his act and deed,
that such instrument as executed is the act and deed of said corporation, and
that the facts stated therein are true.

         GIVEN under my hand on April 21, 1983.

NOTARIAL
SEAL

                                                     ---------------------------
                                                     Notary Public

                                                     My commission expires:













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