THERMO CARDIOSYSTEMS INC
S-3, 1996-06-11
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                     As filed with the Securities and Exchange Commission
                                                         on June 11, 1996
                                      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
                                Woburn, MA 01888
                                 (617) 932-8668
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                               __________________

                          Sandra L. Lambert, Secretary
                            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
                                  P.O. Box 9046
                             Waltham, MA 02254-9046 
                              ______________________

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


        Title of each             Proposed
          class 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     60,000                                    
          value per     shares     $50(1)   $3,000,000(1)   $1,035(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 7, 1996.

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

             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

                                  60,000 Shares

                            THERMO CARDIOSYSTEMS INC.

                                  Common Stock
                            Par Value $.10 Per Share

             This Prospectus relates to the resale of 60,000 shares (the
        "Shares") of Common Stock, par value $.10 per share (the "Common
        Stock"), of Thermo Cardiosystems Inc. (the "Company" or the
        "Registrant") that may be acquired upon exercise of the Company's
        Stock Purchase Warrant dated May 26, 1993 (the "Warrant").  The
        Warrant is exercisable by a certain shareholder of the Company
        (the "Selling Shareholder") at any time, and from time to time,
        in whole or in part, at a price of $5.83 per share, subject to
        adjustment to prevent dilution resulting from stock splits, stock
        dividends or similar transactions, as provided in the Warrant.
        The Selling Shareholder may distribute the Shares to its
        stockholders.  The Shares may also be offered by the Selling
        Shareholder and/or its stockholders 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.  The Selling Shareholder and/or its stockholders may
        effect such transactions by selling the Shares to or through
        broker-dealers, and such broker-dealers may receive compensation
        in the form of discounts, concessions or commissions from the
        Selling Shareholder, its stockholders 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 Selling Shareholder, its stockholders and any
        broker-dealer who acts in connection with the sales 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 commissions 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.  See "Selling Shareholder."

             The Shares offered hereby involve a high degree of risk.
                     See "Risk Factors" beginning on page 4.


                                  -------------
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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 COMMISSION 
               OR ANY STATE SECURITIES COMMISSION PASSED UPON THE 
                    ACCURACY OR ADEQUACY OF THIS PROSPECTUS. 
            ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                  _____________

             None of the proceeds from the sale of the Shares by the
        Selling Shareholder 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 advisers to the Selling Shareholder) in
        connection with the registration and sale of the Shares being
        registered hereby.  The Company has agreed to indemnify the
        Selling Shareholder against certain liabilities, including
        liabilities under the Securities Act as underwriters or
        otherwise.


        June 11, 1996 

                                  _____________


             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 person in any
        jurisdiction in which such offer or solicitation may not be
        lawfully made.

                                  _____________


                              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

                                        2
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<PAGE>




        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 7 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 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.

             This Prospectus, which constitutes part of a Registration
        Statement filed by the Company with the Commission under the
        Securities Act, omits certain of the information contained in the
        Registration Statement.  Reference is hereby made to the
        Registration Statement and to the exhibits relating thereto for
        further information with respect to the Company and the Shares
        offered hereby.  Statements contained herein concerning
        provisions of documents are necessarily summaries of such
        documents, and each statement is qualified in its entirety by
        reference to the applicable document filed with the Commission.

             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, Secretary, Thermo Cardiosystems Inc., c/o
        Thermo Electron Corporation, 81 Wyman Street, P. O. Box 9046,
        Waltham, Massachusetts 02254-9046 (telephone number:  (617)
        622-1000).


                                   THE COMPANY

             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, which 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 (IP) 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 October 1994, the Company

                                        3
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<PAGE>




        announced that the U.S. Food and Drug Administration ("FDA") had
        granted approval for the commercial sale of the air-driven LVAS
        for use as a bridge-to-transplant.  With this approval, the
        air-driven system became available for sale to cardiac centers
        throughout the United States.  The Company received the European
        Conformity Mark ("CE Mark") for commercial sale of the air-driven
        LVAS in all European Community countries in April 1994, and, in
        August 1995, received the same approval for the electric system.
        The electric version of the LVAS is currently being used in the
        U.S. in clinical trials for patients awaiting heart transplants,
        and, late in 1995, the FDA approved the protocol for conducting
        clinical trials of the electric LVAS as an alternative to heart
        transplant.  The electric LVAS is being used in Europe as both a
        bridge-to-transplant and as an alternative to heart transplant.

             The Company was incorporated in 1988 as a wholly-owned
        subsidiary of Thermedics Inc. ("Thermedics") 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.  Prior to the formation of Thermedics in June 1983, this
        business was conducted by a division of Thermo Electron
        Corporation ("Thermo Electron") beginning in 1966. 

             In April 1996, the Company declared a three-for-two stock
        split in the form of a 50% stock dividend, payable on May 15,
        1996, to shareholders of record as of May 1, 1996.  The share and
        per share data as reported in the Company's Annual Report on the
        10-K for the year ended December 30, 1995, incorporated herein by
        reference, has not been restated to reflect the stock split.
        Common shares outstanding as of December 30, 1995, on a pro forma
        basis, reflecting the stock split, would have been 36,163,275
        shares. The following table presents other selected financial
        data on a pro forma basis to reflect the stock split.

                                                        Fiscal Year
                                                        -----------

        (In thousands except per share amounts)    1995    1994    1993
        ---------------------------------------    ----    ----    ----

        Earnings per share                         $.19   $.05    $.01

        Weighted average shares                    37,273 36,930  33,264

             As of March 31, 1996, Thermedics owned 13,055,075 shares of
        the Company's common stock, representing approximately 54% of
        such stock outstanding and Thermo Electron owned 126,952 shares
        of the Company's common stock representing approximately .5% of
        such stock outstanding.  In April 1996, Thermedics acquired
        90,000 shares of the Company's common stock from Thermo Electron.
        In consideration for such shares, and 107,500 shares of the
        common stock of Thermo Voltek Corp., another subsidiary of
        Thermedics, Thermedics issued 299,112 shares of its common stock
        to Thermo Electron.  As of March 31, 1996, Thermedics was a
        52%-owned subsidiary of Thermo Electron. 



                                        4
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<PAGE>




             The Company's principal offices are located at 470 Wildwood
        Street, P.O. Box 2697, Woburn, Massachusetts 01888-2697, and its
        telephone number is (617) 932-8668.





















































                                        5
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                                  RISK FACTORS

             Investors should carefully consider the following factors in
        evaluating the Company and its business before purchasing the
        securities offered hereby.

             Uncertainty of Regulatory Approval for Biomedical Devices.
        The Company's LVAS is subject to approval by the FDA before they
        may be sold at a profit in the U.S.  The Company is also subject
        to regulatory requirements in foreign countries in which the
        Company markets its devices.  The process of obtaining regulatory
        approvals is lengthy, expensive and inherently uncertain.
        Failure to comply with applicable regulatory requirements can
        result in, among other things, fines, suspensions of approvals,
        recalls of products, operating restrictions and criminal
        prosecutions.

             In October 1994, the Company's air-driven LVAS was approved
        for commercial sale by the FDA.  This approval allows the Company
        to sell the air-driven LVAS to cardiac surgery centers in the
        United States.  In April 1994, the Company received the CE Mark
        for commercial sale of the air-driven LVAS in all European
        Community countries.  The Company has developed the HeartPak_,
        which is a lightweight portable console designed to be used with
        the air-driven LVAS.  Although the HeartPak portable console
        received the CE Mark for commercial sale in all European
        Community countries in February, 1995, the Company must still
        obtain FDA approval before selling it commercially in the U.S.
        In July 1995, the FDA approved the beginning of Phase I clinical
        trials of the HeartPak portable console which will evaluate the
        safety of the system in hospitals.  The Company also plans to
        conduct Phase II studies of the HeartPak portable console to
        evaluate the system in the home environment.  The Company intends
        to seek FDA approval of the HeartPak portable console by filing a
        supplement to its air-driven LVAS premarket approval ("PMA")
        application, which was previously approved by the FDA.  However,
        no assurance can be given that the Company will file such
        supplement on a timely basis, or at all.  Further, even if the
        supplement is filed, there can be no assurance that the HeartPak
        portable console will ultimately receive FDA approval.  Failure
        of the Company to obtain approval of such a supplement may
        require patients supported by the air-driven LVAS to remain
        hospitalized.  This could materially decrease the market for the
        air-driven LVAS.

             The Company is currently conducting clinical trials of its
        electric LVAS, which is subject to the same regulatory approval
        process.  In December 1995, the FDA approved the protocol for
        conducting clinical trials of the electric LVAS as an alternative
        to heart transplant.  No assurance can be given that the Company
        will file a PMA application with respect to the electric LVAS on
        a timely basis, or at all, or that the PMA application, if filed,
        will ultimately be approved by the FDA.  In addition, any design


                                        6
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<PAGE>




        changes to the Company's LVAS must be approved pursuant to a
        supplement to an approved PMA application.

             Limited History of Profitability.  Prior to FDA approval of
        the air-driven LVAS in October 1994, the Company incurred
        significant operating losses.  Since the fourth quarter of 1994,
        the Company has generated operating profits.  However, the level
        of profitability achieved by the Company will continue to depend,
        in part, upon its ability to obtain FDA approvals of new products
        and product enhancements.  Until the Company receives FDA
        approval for the commercial sale of its Heartpak portable console
        and its electric LVAS, the Company will not be permitted to earn
        a profit from the sale of such products in the U.S.  Furthermore,
        even if the Company receives FDA approval to market one or more
        of these devices, there can be no assurance that the Company will
        be successful in commercializing such devices.

             Uncertainty of Patient Reimbursement.  The cost of
        implanting a cardiac support system is substantial.  Sales of the
        Company's LVAS will depend to a large degree upon the
        availability of reimbursement for the implantation of the LVAS.
        In November 1995, the U.S. Health Care Finance Administration
        ("HCFA") issued a decision that extends Medicare coverage to the
        air-driven LVAS.  In addition, certain non-government insurers
        have agreed to offer coverage for the air-driven LVAS.  Even
        though reimbursement has been established by HCFA and certain
        non-government insurers, the amount available for reimbursement
        may be denied by insurers under certain circumstances, including
        if it is determined that a procedure was not the most
        cost-effective treatment method, was experimental, or was used
        for an unapproved indication.  Further, no assurance can be given
        that additional third party insurers will approve reimbursement
        for the air-driven LVAS or that third party reimbursement for the
        HeartPak portable console and electric LVAS will generally be
        available within a reasonable period, or at all, if the FDA
        approves commercial sale of those products.  Without the
        financial support of the government or third party insurers, the
        market for the Company's LVAS will be limited.  In addition,
        Medicare and Medicaid limit the reimbursement that hospitals
        receive for treating certain medical conditions by setting
        maximum fees that can be charged to their patients.  Under this
        system, hospitals are paid a fixed amount for treating each
        patient with a particular diagnosis.  Private insurers also have
        initiated reimbursement systems designed to slow the escalation
        of health care costs.  In addition, the Federal government is
        considering, and certain state governments are considering or
        have adopted, new health care policies intended to curb rising
        health care costs.  Such policies include rationing of
        government-funded reimbursement for health care services and
        imposing price controls upon providers of medical products and
        services.  These policies could have the effect of limiting the
        availability of reimbursement for procedures, such as the
        implantation of an LVAS, that involve prolonged treatment of
        critically ill patients.  The Company cannot predict what effect
        the policies of governmental entities and other third party

                                        7
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        payors will have on future sales of LVAS.  The unavailability of
        third party reimbursement for procedures involving the Company's
        LVAS would have a material adverse effect on the Company's
        business.

             Uncertainty of Opinion Leader Acceptance and Support.  A
        limited number of cardiac surgeons and cardiologists influences
        medical device selection and purchase decisions for a large
        portion of the target patient population.  The Company will
        achieve its business objectives only if its LVAS is recommended
        for use by such opinion leaders.  The Company has developed
        working relationships with a number of leading medical centers,
        and its existing and proposed LVAS has been well received by
        opinion leaders in cardiac surgery and cardiology.  Moreover,
        since the inception of its work on cardiac support systems in
        1966, the Company has relied upon surgical teams at medical
        institutions to perform clinical trials that are necessary to
        obtain required FDA approvals.  A continuing working relationship
        with those and other institutions will be important to the
        success of the Company.  No assurance can be given that existing
        relationships and arrangements can be maintained or that new
        relationships will be established.  Furthermore, economic,
        psychological, ethical and other concerns may limit acceptance of
        heart assist devices in general, and there can be no assurance
        that markets of sufficient size will develop for the Company's
        LVAS.

             Potential Unavailability of Raw Materials.  In 1992, two
        major manufacturers of medical-grade materials decided to phase
        out or eliminate their supply of raw materials used in
        implantable medical devices.  These withdrawals affected the
        availability of several components and materials used by the
        Company in its products.  The Company has developed and received
        FDA approval for the use of one alternative material and is in
        the process of qualifying certain other alternative materials or
        developing alternative sources for the materials no longer
        supplied by these manufacturers.  While the Company believes that
        it has adequate supplies of materials to meet demand for the LVAS
        for the foreseeable future, there can be no assurance that the
        Company will not experience shortages of certain materials in the
        future that could delay shipments of the LVAS.

             The substitution of new materials for previously approved
        materials in medical devices generally requires additional
        testing and FDA approval.  The time and cost associated with this
        process depend on the similarity of the new material to the
        original material and the amount of available information
        relating to the new material. The cost to the Company to evaluate
        and test alternative materials and the time necessary to obtain
        FDA approval for these materials are inherently difficult to
        determine because both time and cost are dependent on at least
        two factors:  the similarity of the new material to the original
        material and the amount of third party testing that may have
        already been conducted on the new material.  There can be no
        assurance that the FDA approval process for the new materials

                                        8
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        will not be lengthy, or that the FDA ultimately will approve the
        new materials.  

             Technological Change and Competition.  The Company is aware
        of one other company that has submitted a PMA application with
        the FDA for an implantable LVAS.  The Company is unaware whether
        this PMA application has been accepted for filing by the FDA.
        Also, the Company is aware of one other company that has received
        approval by the FDA Advisory Panel on Circulatory System Devices
        and subsequent commercial approval for its cardiac-assist device.
        This is an external device, positioned on the outside of the
        patient's chest, and is intended for short-term use in the
        hospital environment.  In addition, the Company is aware that a
        total artificial heart is currently undergoing clinical trials.
        As other organizations perceive the commercial potential for the
        LVAS, the Company believes that competition will intensify.  The
        requirement of obtaining FDA approval for commercial sale of an
        LVAS in the U.S., however, is a significant barrier to entry into
        the U.S. market for these devices.  There can be no assurance,
        though, that FDA regulations will not change in the future,
        reducing the time and testing required for others to obtain FDA
        approval for commercial sale.  In addition, other research groups
        and companies, some of which have significantly greater resources
        than those of the Company, are developing cardiac systems using
        alternative technologies or concepts, one or more of which might
        prove functionally equivalent to or more suitable than the
        Company's systems or may render the Company's products obsolete
        or uneconomic.  

             Uncertainty of Product Development.  Although the Company's
        air-driven LVAS has been approved for commercial sale by the FDA
        the Company's other LVAS products are in various stages of
        development and will require extensive additional laboratory,
        animal and/or human clinical studies.  There can be no assurance
        that the HeartPak portable console or electric LVAS or any future
        versions of the Company's LVAS will receive FDA approval.  The
        inability of the Company to obtain FDA approval of its HeartPak
        portable console or electric LVAS could have a material adverse
        impact on the market for the Company's products.  

             Limited Manufacturing and Marketing Experience.  Until
        recently, the Company has been required to manufacture only a
        limited number of the LVAS for use in clinical trials.  During
        1994 and 1995, in anticipation of FDA approval of the air-driven
        LVAS, the Company more than doubled its manufacturing space and
        hired and trained new manufacturing personnel.  The Company,
        however, has limited experience in manufacturing large quantities
        of the LVAS for commercial sale.  Although the Company believes
        that it has the capacity and the expertise to manufacture enough
        LVAS to meet anticipated demand, no assurance can be given that
        the Company will be able to manufacture the LVAS in high volumes,
        in a timely manner and at acceptable quantity levels and costs.
        Furthermore, while the Company employs a limited number of sales
        and marketing personnel who are responsible for selling and
        marketing the Company's LVAS to approved sites, the Company does

                                        9
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        not have experience in the large-scale commercialization of
        medical devices.  No assurances can be given that the Company
        will be able to build its sales and marketing staff in a timely
        and cost-effective manner or that the Company's increased sales
        and marketing efforts will be successful.

             Potential Conflict of Interest.  For financial reporting
        purposes, both Thermo Electron and Thermedics will include their
        share of the Company's net income or loss in their consolidated
        results of operations.  Certain officers of the Company are also
        officers of Thermedics and/or Thermo Electron.  Such officers
        will devote only a portion of their time to the affairs of the
        Company.  The members of the Board of Directors and officers of
        the Company who are also affiliated with Thermedics and/or Thermo
        Electron will consider not only the short-term and long-term
        impact of operating decisions on the Company, but also the impact
        of such decisions on the consolidated financial results of
        Thermedics and Thermo Electron.  The Company is also party to
        various agreements with Thermo Electron that may limit the
        Company's operating flexibility.

             Intellectual Property Rights.  The Company relies
        principally upon trade secret protection and, to a lesser extent,
        patents to protect its proprietary rights.  The Company requires
        all employees to execute non-disclosure agreements protecting the
        Company's trade secrets.  However, no assurance can be given that
        non-disclosure agreements will effectively protect the Company's
        trade secrets, or that competitors will not independently develop
        equivalent technology, design around the Company's patents or
        obtain access to information that the Company believes is
        proprietary.  The Company's competitive position could be
        adversely affected if the Company is unable to protect adequately
        its proprietary rights.  Also, there can be no assurance that
        others will not claim that the Company's activities infringe
        their intellectual property rights.  In April 1995, the Company
        received correspondence from a third party alleging that the
        textured surface of the LVAS housing infringed certain patent
        rights of such third party.  The Company had previously received
        similar correspondence from this third party but had not received
        any communication for more than three years.  In the April 1995
        communication, the third party offered the Company a license,
        which the Company has elected not to accept.  Although the
        Company has not received any communication since April 1995 and
        believes that it has adequate defenses to the claims of the third
        party, due to the inherent uncertainty of litigation, no
        assurance can be made that the Company would be successful were
        any litigation to be commenced.

             Product Liability.  The Company faces an inherent business
        risk of exposure to product liability claims relating to the use
        of its products.  Although the Company currently maintains
        product liability insurance against this risk, there can be no
        assurance that it will be able to continue to obtain such
        coverage at economically feasible rates, or at all, or that such
        coverage will be adequate in terms and scope to completely

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        protect the Company in the event of a successful product
        liability claim.

                               SELLING SHAREHOLDER

             The following table sets forth the name of the Selling
        Shareholder, the number of shares of Common Stock beneficially
        owned by the Selling Shareholder, the number of Shares that may
        be offered by the Selling Shareholder pursuant to this Prospectus
        (assuming the exercise in full of the Warrant), and the number of
        Shares the Selling Shareholder will own after completion of the
        offering, assuming all of the Shares being offered hereby are
        sold.

                                    Shares of                   Shares
                                      Common                    Owned
                                   Stock Owned     Shares       After
           Selling Shareholder       Prior to      Being      Completion
           -------------------
                                       the        Offered       of the
                                                  -------
                                   Offering(1)                 Offering
                                   --------                    --------

            The Polymer Technology    60,000       60,000         0
            Group, Incorporated(2)

        _______________

             (1)  Calculated in accordance with Securities and Exchange
                  Commission Rule 13d-3, promulgated under the Exchange
                  Act.
             (2)  The Selling Shareholder manufactures certain biomedical
                  polyurethanes and other specialty polymers and
                  biomaterials used by the Company in its products and
                  also licenses certain proprietary rights in such
                  materials to the Company.

                                 SALE OF SHARES

             The Company has been advised that the Selling Shareholder
        may distribute the Shares to its stockholders and it and/or its
        stockholders may sell the Shares 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 which may be
        changed, at market prices prevailing at the time of sale, at
        prices related to such prevailing market price or at negotiated
        prices.  The Selling Shareholder and/or its stockholders may
        effect such transactions by selling the Shares to or through
        broker-dealers, and such broker-dealers may receive compensation
        in the form of discounts, concessions or commissions from the
        Selling Shareholder, its stockholders 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).


                                       11
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<PAGE>




             The Selling Shareholder, its stockholders and any
        broker-dealers who act in connection with the sale of Shares
        hereunder may be deemed to be "underwriters" as that term is
        defined in the Securities Act, and any commissions 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.  The Company has agreed to indemnify the Selling
        Shareholder against certain liabilities, including liabilities
        under the Securities Act as underwriter or otherwise.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

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

             (a)  The Company's Annual Report on Form 10-K for the year
                  ended December 30, 1995.

             (b)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended March 30, 1996.

             (c)  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 and other documents 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, 1,200
        shares of Common Stock, 82,385 shares of Thermo Electron common
        stock and 8,900 shares of Thermedics common stock.

                                     EXPERTS

             The financial statements and schedules of the Company for
        the year ended December 30, 1995, incorporated in this Prospectus
        by reference to the Company's Annual Report on Form 10-K for the
        year ended December 30, 1995 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

                                       12
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<PAGE>




        are incorporated herein in reliance upon the authority of said
        firm as experts in giving said reports.  






















































                                       13
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<PAGE>





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

             Item 14.  Other Expenses of Issuance and Distribution.

             The expenses (other than the underwriting discount) 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.                                                
            
                                                              Amount*
                                                              ------

             Registration fee - Securities and Exchange
             Commission ...................................$    1,035
             Legal fees and expenses ......................     5,000
             Accounting fees and expenses .................     2,000

                  Total ...................................$    8,035

        *    All amounts are estimated except the Securities and Exchange
        Commission fee.

             Item 15.  Indemnification of Directors and Officers. 

             (a)  The Massachusetts General Laws 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.

             (b)  Section 5.8 of the Company's By-laws provides that the
        Company shall, to the extent legally permissible, indemnify any
        person who was or is a party to, is threatened to be made a party
        to, or is otherwise involved in any proceeding by reason of the
        fact that such person is or was a director, officer, employee, or
        agent of the Company, or is or was serving at the request of the
        Company as a director, officer, employee, or agent of another
        entity in which the Company has an interest, against all
        liabilities and expenses actually and reasonably incurred by such
        person in connection with the defense or settlement of such
        proceeding, except with respect to any matter as to which such
        person shall have been adjudicated in such proceeding not to have
        acted in good faith in the reasonable belief that his or her
        action was in the best interests of the Company, or, with respect
        to any criminal proceeding, had reasonable cause to believe his
        or her conduct was unlawful; provided, however, that in the case
        of any proceeding by or in the right of the Company to procure a
        judgment in its favor, no indemnification shall be made in
        respect of any claim, issue or matter as to which such person
        shall have been adjudged to be liable for negligence or
        misconduct in the performance of his or her duties to the

                                       14
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<PAGE>




        Company, unless (and only to the extent that) the court in which
        such proceeding was brought shall determine upon application
        that, despite the adjudication of liability but in view of all
        the circumstances of the case, such person is fairly and
        reasonably entitled to indemnity for such expenses as such court
        shall deem proper.  Expenses incurred in defending any proceeding
        may be paid by the Company in advance of the final disposition of
        such proceeding as authorized by the Board of Directors in the
        specific case upon receipt of an undertaking in writing by or on
        behalf of the indemnified person to repay such amount unless it
        shall be determined ultimately that such person is entitled to be
        indemnified by the Company as provided in such Section 5.8.  The
        right of indemnification provided by Section 5.8 of the Company's
        By-laws is not exclusive of, and does not affect, any other right
        to which any person may be entitled.

             (c)  The Company has indemnification agreements with its
        directors and officers providing for the maximum indemnification
        permitted by law.  The Company's directors and officers are also
        covered by an insurance policy against certain liabilities that
        might be incurred in connection with the performance of their
        duties.

             Item 16.  Exhibits.

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

             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,

                                       15
PAGE
<PAGE>




                            the changes in volume and price represent no
                            more than a 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 with or
                       furnished to the Commission 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
                       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 (and, where applicable, each filing of an employee benefit
        plan's annual report pursuant to 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 therein, 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

                                       16
PAGE
<PAGE>




        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.











































                                       17
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<PAGE>




                                   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 day
        of June 10, 1996.

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

        /s/Victor L. Poirier      President, Chief        June 10, 1996
        Victor L. Poirier         Executive Officer and
                                  Director


        /s/John N. Hatsopoulos    Vice President and      June 10, 1996
        John N. Hatsopoulos       Chief Financial
                                  Officer


        /s/Paul F. Kelleher       Chief Accounting        June 10, 1996
        Paul F. Kelleher          Officer






                                       18
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<PAGE>




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


        /s/Walter J. Bornhorst    Director                June 10, 1996
        Walter J. Bornhorst


        /s/Richard W.K. Chapman   Director                June 10, 1996
        Richard W.K. Chapman


        /s/Elias P. Gyftopoulos   Director                June 10, 1996

        Elias P. Gyftopoulos

        /s/Robert C. Howard       Director                June 10, 1996

        Robert C. Howard

        /s/Leonard Laster         Director                June 10, 1996

        Leonard Laster

        /s/John W. Wood Jr.       Chairman of the Board   June 10, 1996

        John W. Wood Jr.          and Director

        /s/Nicholas T. Zervas     Director                June 10, 1996

        Nicholas T. Zervas

























                                       19
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<PAGE>




                                  EXHIBIT INDEX


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

               
              5        Opinion of Seth H. Hoogasian, Esq.       

             23.1      Consent of Arthur Andersen LLP.            

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

             24        Power of Attorney (See Signature Page).









        AA961340034






































                                                                EXHIBIT 5
                        [Thermo Cardiosystems Letterhead]

                                  June 10, 1996

        Thermo Cardiosystems Inc.
        470 Wildwood Street
        Woburn, MA 01888

             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 60,000 shares of the Company's Common Stock, $.10
        par value per share (the "Shares"), which may from time to time
        be sold by a shareholder of the Company.

             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 investigations of law and have
        discussed with the Company's representatives questions of fact
        that I or a member of my staff have deemed necessary or
        appropriate.

             Based upon and subject to the foregoing, I am of the opinion
        that the issuance of the Shares has been duly authorized by the
        Company and, when issued and sold in accordance with the
        provisions of the Stock Purchase Warrant dated May 26, 1993 by
        the Company to The Polymer Technology Group, Incorporated, will
        be validly issued, fully paid and non-assessable.

             I hereby consent to the filing of this opinion as Exhibit 5
        to the Registration Statement, including any amendments thereto,
        and to the use of my name under the caption "Legal Matters" in
        the prospectus constituting a part thereof.       

                                           Sincerely,



                                           Seth H. Hoogasian
                                           General Counsel








                                                             EXHIBIT 23.1




                    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 February 7, 1996 included in Thermo Cardiosystems
        Inc.'s Form 10-K for the year ended December 30, 1995 and to all
        references to our Firm included in this registration statement.



        ARTHUR ANDERSEN LLP

        Boston, Massachusetts  
        June 7, 1996










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