THERMO CARDIOSYSTEMS INC
S-3, 1997-06-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                   As filed with the Securities and Exchange 
                           Commission on June 16, 1997
                                               Registration No. 333-_____
                                                                         

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549
                               __________________

                                    FORM S-3 
                             Registration Statement
                                      Under
                           The Securities Act of 1933
                               __________________

                            THERMO CARDIOSYSTEMS INC.
             (Exact name of registrant as specified in its charter)

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

              Massachusetts                                04-3027040
        (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)                Identification No.)

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

                               470 Wildwood Street
                                 P. O. Box 2697
                        Woburn, Massachusetts  01888-2697
                                 (617) 622-1000
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                               __________________

                            Sandra L. Lambert, Clerk
                            Thermo Cardiosystems Inc.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                 P. O. Box 9046
                             Waltham, MA  02254-9046
                                 (617) 622-1000
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                           Seth H. Hoogasian, Esquire
                                 General Counsel
                            Thermo Cardiosystems Inc.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                       Waltham, Massachusetts 02254-9046 
                              ______________________

             Approximate date of commencement of proposed sale to the
        public:  As soon as practicable after the Registration Statement
        has become effective.
PAGE
<PAGE>






             If the only securities being registered on this form are
        being offered pursuant to dividend or interest reinvestment
        plans, please check the following box.   [   ]

             If any of the securities being registered on this form are
        to be offered on a delayed or continuous basis pursuant to Rule
        415 under the Securities Act of 1933, other than securities
        offered only in connection with dividend or interest reinvestment
        plans, check the following box.   [ x ] 

             If this Form is filed to register additional securities for
        an offering pursuant to Rule 462(b) under the Securities Act,
        please check the following box and list the Securities Act
        registration statement number of the earlier effective
        registration statement for the same offering.  [   ]

             If this Form is a post-effective amendment filed pursuant to
        Rule 462(c) under the Securities Act, check the following box and
        list the Securities Act registration statement number of the
        earlier effective registration statement for the same offering.
        [   ]

             If delivery of the prospectus is expected to be made
        pursuant to Rule 434, please check the following box.  [   ]

                               __________________

                         CALCULATION OF REGISTRATION FEE

                                   Proposed
          Title of                  Maximum     Proposed
         securities     Amount     Offering     Maximum      Amount of
            to be        to be     Price Per   Aggregate    Registration
         registered   registered     Share   Offering Price     Fee

        Common Stock,
          $.10 par     2,228,235   $27 9/32   $60,789,037      $18,421
          value per     shares        (1)         (1)           (1)
           share 

        (1)  Estimated solely for the purpose of calculating the amount
             of the registration fee pursuant to Rule 457(c) based on the
             average of the high and low sales prices of the Common Stock
             on the American Stock Exchange on June 10, 1997.


                            -------------------------
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<PAGE>





             THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON
        SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE
        DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH
        SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL
        THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
        THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT
        SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
        PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.


PAGE
<PAGE>








        PROSPECTUS

                                2,228,235 Shares

                            THERMO CARDIOSYSTEMS INC.

                                  Common Stock



             This Prospectus relates to the resale of 2,228,235 shares
        (the "Shares") of Common Stock, par value $.10 per share (the
        "Common Stock"), of Thermo Cardiosystems Inc. (the "Company")
        issuable upon conversion of $70,000,000 principal amount of the
        Company's outstanding 4-3/4% Convertible Subordinated Debentures
        due 2004 (the "Debentures").  The Debentures are convertible, at
        the option of the holder (a "Selling Shareholder"), at a
        conversion price of $31.415 per share, subject to adjustment for
        certain events.  The Shares may be offered from time to time in
        transactions on the American Stock Exchange, in negotiated
        transactions, through the writing of options on the Shares, or a
        combination of such methods of sale, at fixed prices that may be
        changed, at market prices prevailing at the time of sale, at
        prices related to such prevailing market prices or at negotiated
        prices.  Such transactions may be effected by the sale of  the
        Shares to or through broker-dealers, and such broker-dealers may
        receive compensation in the form of discounts, concessions or
        commissions from the sellers and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).  The
        sellers of the Shares and any broker-dealer who acts in
        connection with the sale of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act of
        1933, as amended (the "Securities Act"), and any commission
        received by them and profit on any resale of the Shares as
        principal might be deemed to be underwriting discounts and
        commissions under the Securities Act.

             None of the proceeds from the sale of the Shares will be
        received by the Company.  The Company has agreed to bear all
        expenses (other than underwriting discounts and selling
        commissions, and fees and expenses of counsel or other advisors
        to the sellers of the Shares) in connection with the registration
        and sale of the Shares being registered hereby.  The Company has
        agreed to indemnify the sellers of the Shares against certain
        liabilities, including liabilities under the Securities Act as
        underwriter or otherwise.

                                  _____________


                                        1
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<PAGE>







          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
           COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION 
            OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCU-
               RACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESEN-
                  TATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                  _____________

             No dealer, salesman or other person has been authorized to
        give any information or to make any representations other than
        those contained or incorporated by reference in this Prospectus
        regarding the Company or the offering made by this Prospectus,
        and, if given or made, such information or representations must
        not be relied upon as having been authorized by the Company or by
        any other person.  All information contained in this Prospectus
        is as of the date of this Prospectus.  Neither the delivery of
        this Prospectus nor any sale or distribution and resale made
        hereunder shall, under any circumstances, create any implication
        that there has been no change in the affairs of the Company since
        the date hereof.  This Prospectus does not constitute an offer to
        sell or a solicitation of any offer to buy any security other
        than the securities covered by this Prospectus, nor does it
        constitute an offer to or solicitation of any offer to buy any
        security other than the securities covered by this Prospectus,
        nor does it constitute an offer to or solicitation of any person
        in any jurisdiction in which such offer or solicitation may not
        be lawfully made.


        _________, 1997 






















                                        2
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<PAGE>







                              AVAILABLE INFORMATION

             The Company is subject to the informational requirements of
        the Securities Exchange Act of 1934, as amended (the "Exchange
        Act"), and in accordance therewith files reports, proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").  Such reports, proxy statements
        and other information can be inspected and copied at the public
        reference facilities maintained by the Commission at 450 Fifth
        Street, N.W., Washington, D.C. 20549, and at the following
        Regional Offices of the Commission:  500 West Madison Street,
        Suite 1400, Chicago, Illinois 60661, and Seven World Trade
        Center, Suite 1300, New York, New York 10048.  Copies of such
        material can also be obtained from the Public Reference Section
        of the Commission at 450 Fifth Street, N.W., Washington, D.C.
        20549 at prescribed rates.  The Commission also maintains a Web
        site at (http:\\www.sec.gov).  The Common Stock of the Company is
        listed on the American Stock Exchange, and the reports, proxy
        statements and other information filed by the Company with the
        Commission can be inspected at the offices of the American Stock
        Exchange, 86 Trinity Place, New York, New York 10006.

             The Company has filed with the Commission a registration
        statement (together with all amendments and exhibits thereto, the
        "Registration Statement") under the Securities Act with respect
        to the securities offered hereby.  This Prospectus does not
        contain all of the information set forth in the Registration
        Statement, certain parts of which are omitted in accordance with
        the rules and regulations of the Commission.  For further
        information, reference is made to the Registration Statement,
        copies of which may be obtained upon payment of the fees
        prescribed by the Commission from the Public Reference Section of
        the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
        and at the Commission's regional offices at Seven World Trade
        Center, New York, New York, 10048 and at 500 West Madison Street,
        Chicago, Illinois, 60661.

             The Company undertakes to provide without charge to each
        person to whom a copy of this Prospectus has been delivered, on
        the written or oral request of such person, a copy of any or all
        of the documents that have been or may be incorporated in this
        Prospectus by reference, other than exhibits to such documents
        (unless such exhibits are specifically incorporated by reference
        therein).  Requests for such copies should be directed to:
        Sandra L. Lambert, Clerk, Thermo Cardiosystems Inc., 81 Wyman
        Street, P. O. Box 9046, Waltham, Massachusetts 02254-9046
        (telephone number:  (617) 622-1000).






                                        3
PAGE
<PAGE>





                                   THE COMPANY

             The Company develops and manufactures left ventricular
        assist systems and, through its International Technidyne
        Corporation subsidiary ("ITC"), manufactures a variety of
        coagulation-testing equipment and related disposables, along with
        single-use, skin-incision devices.

             The Company is a leader in the research, development and
        manufacture of implantable left ventricular assist systems
        ("LVAS").  These systems are designed to perform substantially
        all or part of the pumping function of the left ventricle of the
        natural heart for patients suffering from cardiovascular disease.
        Unlike total artificial heart systems, that require removal of
        the natural heart, the LVAS allows the natural heart to remain in
        place, preserving the heart's biological control mechanisms and
        reducing blood-contacting surfaces that have led to strokes in
        patients using other cardiac devices.  The Company has developed
        two systems for patients requiring long-term cardiac support:  an
        implantable pneumatic LVAS that is powered by an external
        electrically driven air-pump, and an electric LVAS that is driven
        by an implanted electric motor and powered by a lightweight
        battery pack worn by the patient. 

             In December 1996, the Company acquired substantially all of
        the assets, subject to certain liabilities, of Nimbus Medical,
        Inc. ("Nimbus"), a research and development organization, for
        approximately $5.0 million in cash.  Nimbus has been involved in
        artificial heart technology for more than 20 years and has
        carried out research in two primary fields:  ventricular-assist
        devices and total artificial hearts.  Nimbus was instrumental in
        developing the basic technology for high-speed rotary blood
        pumps.  Because of their smaller size, rotary blood pumps may
        potentially be used to provide cardiac support in small adults
        and in children.

             On May 2, 1997, the Company acquired all of the outstanding
        capital stock of ITC from Thermo Electron Corporation ("Thermo
        Electron") in exchange for the right to receive 3,355,705 shares
        of the Company's Common Stock.  ITC is a leading manufacturer of
        near-patient, whole-blood, coagulation-testing equipment and
        related disposables.  ITC also manufactures single-use,
        skin-incision devices.  ITC had revenues of approximately $34.0
        million and net income of approximately $4.7 million for the
        fiscal year ended December 28, 1996.  

             The Company was incorporated on August 18, 1988 as a wholly
        owned subsidiary of Thermedics Inc. ("Thermedics"), a publicly
        traded subsidiary of Thermo Electron, and is the successor in
        interest to the assets and business of that company relating to
        the research and development of implantable heart-assist systems.
        This business was conducted by Thermedics from its formation in
        1983, and prior to that time as a division of Thermo Electron
        beginning in 1966.  Before giving effect to the issuance of the

                                        4
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<PAGE>





        3,355,705 shares of Common Stock to be issued to Thermo Electron
        in connection with the acquisition of ITC, Thermo Electron and
        Thermedics owned an aggregate of 54.2% of the outstanding Common
        Stock of the Company.  Giving effect to the issuance of such
        shares, Thermo Electron and Thermedics own an aggregate of 58.1%
        of such outstanding common stock. 

             The Company's principal executive offices are located at 470
        Wildwood Street, Woburn, Massachusetts 01888, and its telephone
        number is (617) 932-8668.
         

                              SELLING SHAREHOLDERS

             The Selling Shareholders currently hold Debentures
        convertible into the Shares which are the subject of this
        Prospectus.  It is unknown if, when or in what amounts a Selling
        Shareholder may offer Shares for sale and the names of the
        Selling Shareholders who may sell the Shares.  There is no
        assurance that the Selling Shareholders will sell any or all of
        the Shares offered hereby.

             Because the Selling Shareholders may offer all or some of
        the Shares pursuant to the offering contemplated by this
        Prospectus, and because there are currently no agreements,
        arrangements or understandings with respect to the sale of any of
        the Shares that will be held by the Selling Shareholders after
        completion of this offering, no estimate can be given as to the
        principal amount of the Shares that will be held by the Selling
        Shareholders after completion of this offering.

             Other than as a result of the ownership of the Debentures,
        to the best of the Company's knowledge, none of the Selling
        Shareholders had any material relationship with the Company
        within the three year period ending on the date of this
        Prospectus.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

             The following documents previously filed with the Commission
        are incorporated in this Prospectus by reference:

             (1)  The Company's Annual Report on Form 10-K for the fiscal
                  year ended December 28, 1996, as amended.

             (2)  The Company's Quarterly Report on Form 10-Q for the
                  fiscal quarter ended March 29, 1997.

             (3)  The Company's Current Report on Form 8-K, filed with
                  the Commission on May 13, 1997, with respect to certain
                  financial information concerning ITC and announcing the
                  execution of an agreement to issue the Debentures.


                                        5
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<PAGE>





             (4)  The Company's Current Report on Form 8-K, filed with
                  the Commission on May 16, 1997, as amended on Form
                  8-K/A, filed with the Commission on May 30, 1997, with
                  respect to acquisition of ITC and the closing of the
                  issuance of the Debentures.

             (5)  The Company's Current Report on Form 8-K, filed with
                  the Commission on June 13, 1997, with respect to the
                  planned repurchase, through June 12, 1998, of up to
                  $20,000,000 of the Company's Common Stock.

             (6)  The description of the Common Stock which is contained
                  in the Company's Registration Statement on Form 8-A,
                  filed under the Exchange Act, as amended.

                  All reports or proxy statements filed by the Company
        pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange
        Act subsequent to the date of this Prospectus and prior to the
        termination of the offering made hereby shall be deemed to be
        incorporated by reference in this Prospectus and to be a part
        hereof from the respective dates of filing such documents.  Any
        statement contained in a document incorporated or deemed to be
        incorporated by reference herein shall be deemed to be modified
        or superseded for purposes of this Prospectus to the extent that
        a statement contained herein modifies, supersedes or replaces
        that statement.  Any statement so modified or superseded shall
        not be deemed, except as so modified or superseded, to constitute
        a part of this Prospectus.


                                  LEGAL MATTERS

             The validity of the Common Stock offered hereby has been
        passed upon by Seth H. Hoogasian, Esq., General Counsel of the
        Company.  Mr. Hoogasian owns or has the right to acquire,
        pursuant to the exercise of stock options, shares of the Common
        Stock of the Company, Thermedics and Thermo Electron the fair
        market value of which exceeds $50,000.


                                     EXPERTS

             The financial statements and schedule of the Company for the
        three fiscal years ended December 28, 1996, incorporated in this
        Prospectus by reference to Amendment No. 1 on Form 8-K/A to the
        Company's Current Report on Form 8-K, filed with the Commission
        on May 30, 1997, have been audited by Arthur Andersen LLP,
        independent public accountants, to the extent and for the periods
        as indicated in their reports with respect thereto, and are
        incorporated herein in reliance upon the authority of said firm
        as experts in giving said reports. 

             The financial statements of International Technidyne
        Corporation for the three years ended December 28, 1996,

                                        6
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<PAGE>





        incorporated in this Prospectus by reference to Amendment No. 1
        on Form 8-K/A to the Company's Current Report on Form 8-K, filed
        with the Commission on May 30, 1997, have been audited by Arthur
        Andersen LLP, independent public accountants, to the extent and
        for the periods as indicated in their reports with respect
        thereto, and are incorporated herein in reliance upon the
        authority of said firm as experts in giving said reports. 

               














































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                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

             Item 14.  Other Expenses of Issuance and Distribution.

             The expenses incurred by the Company in connection with the
        issuance and distribution of the securities being registered are
        as follows.  All amounts are estimated except the Securities and
        Exchange Commission registration fee and the American Stock
        Exchange listing fee.

                                                               Amount
                                                               ------

        Securities and Exchange Commission Registration Fee   $ 18,421
        American Stock Exchange listing fee  ................   17,500
        Legal fees and expenses  ............................    1,000

        Accounting fees and expenses  .......................    2,000
        Miscellaneous  ......................................    1,000
             Total  ......................................... $ 39,921

                                                         

             Item 15.  Indemnification of Directors and Officers. 

             The Massachusetts Business Corporation Law and the Company's
        Articles of Organization and By-Laws limit the monetary liability
        of directors to the Company and to its stockholders and provide
        for indemnification of the Company's officers and directors for
        liabilities and expenses that they may incur in such capacities.
        In general, officers and directors are indemnified with respect
        to actions taken in good faith in a manner reasonably believed to
        be in, or not opposed to, the best interests of the Company, and
        with respect to any criminal action or proceeding, actions that
        the indemnitee had no reasonable cause to believe were unlawful.
        The Company also has indemnification agreements with its
        directors and officers that provide for the maximum
        indemnification allowed by law.

             Thermo Electron Corporation has an insurance policy which
        insures the directors and officers of Thermo Electron and its
        subsidiaries, including the Company, against certain liabilities
        which might be incurred in connection with the performance of
        their duties.

             Item 16.  Exhibits and Financial Statement Schedules.

             See the Exhibit Index included immediately preceding the
        exhibits to this Registration Statement.





                                      II-1
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<PAGE>





             Item 17.  Undertakings.

             (a)  The undersigned Registrant hereby undertakes:

                   (1) To file, during any period in which offers or
                       sales are being made, a post-effective amendment
                       to this registration statement:

                       (i)  To include any prospectus required by Section
                            10(a)(3) of the Securities Act of 1933;

                       (ii) To reflect in the prospectus any facts or
                            events arising after the effective date of
                            the registration statement (or the most
                            recent post-effective amendment thereof)
                            which, individually or in the aggregate,
                            represent a fundamental change in the
                            information set forth in the registration
                            statement.  Notwithstanding the foregoing,
                            any increase or decrease in volume of
                            securities offered (if the total dollar value
                            of securities offered would not exceed that
                            which was registered) and any deviation from
                            the low or high end of the estimated maximum
                            offering range may be reflected in the form
                            of prospectus filed with the Commission
                            pursuant to Rule 424(b) if, in the aggregate,
                            the changes in volume and price represent no
                            more than 20 percent change in the maximum
                            aggregate offering price set forth in the
                            "Calculation of Registration Fee" table in
                            the effective registration statement;

                       (iii)To include any material information with
                            respect to the plan of distribution not
                            previously disclosed in the registration
                            statement or any material change to such
                            information in the registration statement.

                            Provided, however, that paragraphs (a)(1)(i)
                       and (a)(1)(ii) do not apply if the registration
                       statement is on Form S-3 or Form S-8, and the
                       information required to be included in a
                       post-effective amendment by those paragraphs is
                       contained in periodic reports filed by the
                       Registrant pursuant to Section 13 or Section 15(d)
                       of the Securities Exchange Act of 1934 that are
                       incorporated by reference in the registration
                       statement.

                  (2)  That, for the purpose of determining any liability
                       under the Securities Act of 1933, each such
                       post-effective amendment shall be deemed to be a
                       new registration statement relating to the

                                      II-2
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                       securities offered therein, and the offering of
                       such securities at that time shall be deemed to be
                       the initial bona fide offering thereof.

                  (3)  To remove from registration by means of a
                       post-effective amendment any of the securities
                       being registered which remain unsold at the
                       termination of the offering.

             (b)  The undersigned Registrant hereby undertakes that, for
        purposes of determining any liability under the Securities Act of
        1933, each filing of the Registrant's annual report pursuant to
        Section 13(a) or Section 15(d) of the Securities Exchange Act of
        1934 that is incorporated by reference in this registration
        statement shall be deemed to be a new registration statement
        relating to the securities offered herein, and the offering of
        such securities at that time shall be deemed to be the initial
        bona fide offering thereof.

             (c)  Insofar as indemnification for liabilities arising
        under the Securities Act of 1933 may be permitted to directors,
        officers and controlling persons of the Registrant pursuant to
        the foregoing provisions, or otherwise, the Registrant has been
        advised that in the opinion of the Securities and Exchange
        Commission such indemnification is against public policy as
        expressed in the Act and is, therefore, unenforceable.  In the
        event that a claim for indemnification against such liabilities
        (other than the payment by the Registrant of expenses incurred or
        paid by a director, officer or controlling person of the
        Registrant in the successful defense of any action, suit or
        proceeding) is asserted by such director, officer or controlling
        person in connection with the securities being registered, the
        Registrant will, unless in the opinion of its counsel the matter
        has been settled by controlling precedent, submit to a court of
        appropriate jurisdiction the question whether such
        indemnification by it is against public policy as expressed in
        the Act and will be governed by the final adjudication of such
        issue.

















                                      II-3
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                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant hereby certifies that it has reasonable grounds to
        believe that it meets all of the requirements for filing on Form
        S-3 and has duly caused this Registration Statement to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 12th
        day of June, 1997.

                                      THERMO CARDIOSYSTEMS INC.


                                      By:  /s/ Victor L. Poirier
                                           Victor L. Poirier, President 
                                           and Chief Executive Officer

             KNOW ALL MEN BY THESE PRESENTS that each individual whose
        signature appears below constitutes and appoints John N.
        Hatsopoulos, Paul F. Kelleher, Seth H. Hoogasian, Sandra L.
        Lambert and Jonathan W. Painter, and each of them, as his true
        and lawful attorneys-in-fact and agents for the undersigned, with
        full power of substitution, for and in the name, place and stead
        of the undersigned, to sign and file with the Securities and
        Exchange Commission under the Securities Act of 1933 any and all
        amendments and exhibits to this Registration Statement and any
        and all applications and other documents to be filed with the
        Securities and Exchange Commission pertaining to the registration
        of the securities covered hereby, with full power and authority
        to do and perform any and all acts and things whatsoever
        requisite and necessary or desirable.

             Pursuant to the requirements of the Securities Act of 1933,
        this Registration Statement has been signed by the following
        persons in the capacities and on the dates indicated.

                 Signature                Title              Date
                 ---------                -----              ----
                                                                     

                                    President, Chief
                                    Executive 
        /s/ Victor L. Poirier       Officer and Director   June 12, 1997
        Victor L. Poirier
                                    Vice President and
                                    Chief Financial
        /s/ John N. Hatsopoulos     Officer                June 12, 1997

        John N. Hatsopoulos
                                    Chief Accounting
        /s/ Paul F. Kelleher        Officer                June 12, 1997
        Paul F. Kelleher




                                      II-4
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                 Signature                Title              Date
                 ---------                -----              ----
                                                                     



        /s/ Walter J. Bornhorst     Director               June 12, 1997
        Walter J. Bornhorst


        /s/ Elias P. Gyftopoulos    Director               June 12, 1997
        Elias P. Gyftopoulos


        /s/ John T. Keiser          Director               June 12, 1997
        John T. Keiser


        /s/ Leonard Laster          Director               June 12, 1997
        Leonard Laster


        /s/ John W. Wood Jr.        Chairman of the Board  June 12, 1997

        John W. Wood Jr.

        /s/ Nicholas T. Zervas      Director               June 12, 1997

        Nicholas T. Zervas



























                                      II-5
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                                  EXHIBIT INDEX


        Exhibit                                                Sequential
        Number         Description of Exhibit                   Page No.
        ------         ----------------------                   --------

               
              5      Opinion of Seth H. Hoogasian, Esq.          

             23(a)    Consent of Arthur Andersen LLP    

               (b)    Consent of Seth H. Hoogasian, Esq.
                      (contained in Exhibit 5)

             24       Power of Attorney (See Signature Page)









        AA971480050






























                                      II-6








                                                                EXHIBIT 5





                            THERMO CARDIOSYSTEMS INC.
                               470 Wildwood Street
                                 P. O. Box 2697
                        Woburn, Massachusetts  01888-2697


                                  June 12, 1997


        Thermo Cardiosystems Inc.
        470 Wildwood Street
        P. O. Box 2697
        Woburn, Massachusetts  01888-2697


             Re:  Registration Statement on Form S-3

        Dear Sirs:

             I am General Counsel to Thermo Cardiosystems Inc., a
        Massachusetts corporation (the "Company"), and have acted as
        counsel in connection with the registration under the Securities
        Act of 1933, as amended, on Form S-3 (the "Registration
        Statement"), of 2,228,235 shares (the "Shares") of Common Stock,
        par value $.10 per share, of the Company issuable upon conversion
        of $70,000,000 principal amount of the Company's outstanding
        4-3/4% Convertible Subordinated Debentures due 2004 (the
        "Debentures"). 

             I or a member of my staff have reviewed the corporate
        proceedings taken by the Company with respect to the
        authorization of the issuance of the Shares.  I or a member of my
        staff have also examined and relied upon originals or copies,
        certified or otherwise authenticated to my satisfaction, of all
        corporate records, documents, agreements or other instruments of
        the Company and have made all investigations of law and have
        discussed with the Company's representatives all questions of
        fact that I have deemed necessary or appropriate.

             Based upon and subject to the foregoing, I am of the opinion
        that:

             1.   The Company is a corporation duly organized, validly
        existing and in corporate good standing under the laws of the
        Commonwealth of Massachusetts.
PAGE
<PAGE>





             2.   The issuance and sale of the Shares as contemplated in
        the Registration Statement have been duly authorized by the
        Company.

             3.   The Shares, when issued upon conversion of the
        Debentures, will be validly issued, fully paid and nonassessable.

             I hereby consent to the filing of this opinion as Exhibit 5
        to the Registration Statement.

                                           Very truly yours,




                                           Seth H. Hoogasian
                                           General Counsel

        SHH/cb












        AA971610037









                                                            EXHIBIT 23(a)


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



        As independent public accountants, we hereby consent to the
        incorporation by reference in this registration statement of our
        report dated May 2, 1997 (except with respect to the matter
        discussed in Note 12 as to which the date is May 9, 1997) with
        respect to the financial statements of Thermo Cardiosystems Inc.
        and our report dated February 5, 1997 (except with respect to the
        matter discussed in Note 7 as to which the date is March 29,
        1997) with respect to the financial statements of International
        Technidyne Corporation included in Amendment No. 1 on Form 8-K/A
        to Thermo Cardiosystems Inc.'s Current Report on Form 8-K filed
        with the Commission on May 30, 1997, and to all references to our
        Firm included in this registration statement.






        ARTHUR ANDERSEN LLP

        Boston, Massachusetts
        June 12, 1997
















        AA971610036



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