THERMO CARDIOSYSTEMS INC
10-K, 1997-03-17
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                   ------------------------------------------
                                    FORM 10-K
   (mark one)
   [ X ] Annual Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934 for the fiscal year ended December 28, 1996

   [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934

                         Commission file number 1-10114

                            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
   (Address of principal executive offices)                         (Zip Code)
       Registrant's telephone number, including area code: (617) 622-1000

           Securities registered pursuant to Section 12(b) of the Act:
         Title of each class       Name of each exchange on which registered
     ----------------------------  -----------------------------------------
     Common Stock, $.10 par value           American Stock Exchange         

           Securities registered pursuant to Section 12(g) of the Act:
                                      None

   Indicate by check mark whether the Registrant (1) has filed all reports
   required to be filed by Section 13 or 15(d) of the Securities Exchange Act
   of 1934 during the preceding 12 months, and (2) has been subject to the
   filing requirements for at least the past 90 days. Yes [ X ] No [   ]

   Indicate by check mark if disclosure of delinquent filers pursuant to Item
   405 of Regulation S-K is not contained herein, and will not be contained,
   to the best of the Registrant's knowledge, in definitive proxy or
   information statements incorporated by reference into Part III of this Form
   10-K or any amendment to this Form 10-K. [   ]

   The aggregate market value of the voting stock held by nonaffiliates of the
   Registrant as of January 24, 1997, was approximately $457,813,000.

   As of January 24, 1997, the Registrant had 36,901,560 shares of Common
   Stock outstanding.
                       DOCUMENTS INCORPORATED BY REFERENCE

   Portions of the Registrant's Annual Report to Shareholders for the year
   ended December 28, 1996, are incorporated by reference into Parts I and II.

   Portions of the Registrant's definitive Proxy Statement for the Annual
   Meeting of Shareholders to be held on June 2, 1997, are incorporated by
   reference into Part III.
PAGE
<PAGE>
                                     PART I


    Item 1. Business

    (a) General Development of Business

        Thermo Cardiosystems Inc. (the Company or the Registrant) 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 October 1994, the Company 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 received the same
    approval for the electric system in August 1995. The electric version of
    the LVAS is currently being used in the U.S. in clinical trials for
    patients awaiting heart transplants. In late 1995, the FDA approved the
    protocol for conducting clinical trials of the electric LVAS as an
    alternative to medical therapy, and in April 1996, the first patient was
    implanted with an electric LVAS under this trial. The electric LVAS is
    being used in Europe as both a bridge to transplant and as an alternative
    to medical therapy.

         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.

        The Company was incorporated in 1988 as a wholly owned subsidiary of
    Thermedics Inc. (Thermedics), a publicly traded subsidiary of Thermo
    Electron Corporation (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

                                        2PAGE
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    time as a division of Thermo Electron beginning in 1966. As of December
    28, 1996, Thermedics owned 19,757,612 shares of the Company's common
    stock, representing 54% of such stock outstanding. In addition to the
    Company's products, Thermedics develops, manufactures, and markets
    product quality assurance systems, precision-weighing and inspection
    equipment, electrochemistry and microweighing products, electronic-test
    instruments, explosives-detection devices, and moisture-analysis systems.
    As of December 28, 1996, Thermo Electron owned 46,278 shares of the
    Company's common stock, representing .13% of such stock outstanding.
    Thermedics is a 55%-owned subsidiary of Thermo Electron. Thermo Electron
    is a world leader in environmental monitoring and analysis instruments,
    biomedical products such as heart-assist devices and mammography systems,
    papermaking and recycling equipment, biomass electric power generation,
    and other specialized products and technologies. Thermo Electron also
    provides a range of services related to environmental quality.

        Thermedics intends, for the foreseeable future, to maintain at least
    50% ownership of the Company. This may require the purchase by Thermedics
    of additional shares of common stock of the Company from time to time as
    the number of outstanding shares issued by the Company increases. These
    or any other purchases by Thermedics may be made either in the open
    market or directly from the Company or Thermo Electron. During 1996*,
    Thermedics purchased 40,000 shares of the Company's common stock in the
    open market for $1,219,000. See Notes 4 and 6 to Consolidated Financial
    Statements in the Company's 1996 Annual Report to Shareholders for a
    description of outstanding stock options and convertible obligations
    issued by the Company. 

    Forward-looking Statements

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Annual Report
    on Form 10-K. For this purpose, any statements contained herein that are
    not statements of historical fact may be deemed to be forward-looking
    statements. Without limiting the foregoing, the words "believes,"
    "anticipates," "plans," "expects," "seeks," "estimates," and similar
    expressions are intended to identify forward-looking statements. There
    are a number of important factors that could cause the results of the
    Company to differ materially from those indicated by such forward-looking
    statements, including those detailed under the caption "Forward-looking
    Statements" in the Registrant's 1996 Annual Report Shareholders
    incorporated herein by reference.

    (b) Information About Industry Segments

        The Company conducts business in one industry segment: the research,
    development, and manufacture of implantable heart-assist systems.


    * References to 1996, 1995, and 1994 herein are for the fiscal years
      ended December 28, 1996, December 30, 1995, and December 31, 1994,
      respectively.
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    (c) Description of Business

    Product Background

        The Company began its research and development work in cardiac-
    support systems in 1966. Since that time, the Company and its
    predecessors have received more than $37 million in funding from the U.S.
    government, principally from the National Heart, Lung, and Blood
    Institute of the National Institutes of Health (NIH), to support its
    research. This funding ended in 1992 as the Company moved from
    development to clinical trials.

        Federal regulations require that the Company obtain an
    investigational device exemption (IDE) from the FDA to conduct testing in
    humans. Once sufficient testing has been completed to demonstrate the
    safety and effectiveness of the LVAS, the Company submits a premarket
    approval (PMA) application to the FDA. PMA supplements must be submitted
    for each type and application of the Company's LVAS before being sold
    commercially (see "Government Regulation").

    The Company's LVAS Devices

        The human heart contains two main pumping chambers: the left and
    right ventricles. The right ventricle pumps blood into the lungs where it
    is oxygenated. The blood then flows into the left ventricle where it is
    pumped throughout the body. The Company's LVAS devices support all or
    part of the pumping function of the left ventricle.

        The Company has developed two versions of its LVAS -- an implantable
    pneumatic, or air-driven, system that can be controlled by either a
    bedside or portable console, and an electric system that features an
    internal electric motor powered by an external battery pack worn by the
    patient. Both of the Company's systems employ the Company's HeartMate(R)
    blood pump, and are designed for long-term use. The Company's LVAS
    devices are at various stages of regulatory approval.

        Each version of the Company's LVAS incorporates a number of
    proprietary technological advances in biological compatibility that
    distinguish it from other cardiac-assist devices. For example, the
    Company's systems employ proprietary textured linings that significantly
    reduce the likelihood of blood clots that can lead to strokes. As blood
    enters the pump chamber, blood elements are trapped by its textured
    surface, forming a coagulum, or lining. This coagulum is securely
    anchored to the textured surface and forms a "living" lining similar to
    that found in arteries and veins. This blood-contacting surface is
    derived from the patient's own blood and is therefore blood-compatible.
    Because of the risk of blood clots, patients who receive smooth-surface
    devices must take daily doses of prescription anticoagulants, the level
    of which must be constantly monitored. In contrast, patients on the
    Company's LVAS receive only minimal anticoagulation treatment of one
    aspirin per day.
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<PAGE>
        The HeartMate blood pump is used in each version of the Company's
    LVAS. This pump is implanted just below the diaphragm in a position that
    minimizes interference with normal circulation and other bodily
    functions. An inlet tube is inserted into the apex of the left ventricle
    to drain blood into the pump chamber. Blood is then forced out of the
    pump through an animal tissue valve and back into the aorta. The
    HeartMate blood pump works with the biological control mechanism of the
    natural heart to increase pumping capability when required for activities
    such as climbing stairs.

        Air-driven LVAS. In October 1994, the air-driven system was approved
    for commercial sale by the FDA. This approval allows the Company to sell
    the air-driven LVAS to any of the nearly 900 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. This system is intended as a bridge to transplant for patients
    awaiting heart transplantation. In the air-driven LVAS, the HeartMate
    blood pump is coupled to an external console connected to the body by a
    tube. The Company has also developed the HeartPak(TM), a lightweight
    portable console that can be carried over the shoulder. The portable
    console received the CE Mark for commercial sale in European Community
    countries in February 1995. In July 1995, the FDA approved the beginning
    of Phase I clinical trials of the HeartPak portable pneumatic driver.
    Phase I of the study will evaluate the safety of the system in the
    hospital; Phase II will evaluate the system in the home environment. In
    1996, doctors began enrolling patients in Phase I of this trial.

        Electric LVAS. The Company has also developed an electric LVAS that
    uses the HeartMate blood pump driven by an internal electric motor
    mounted in the blood pump housing. The system is connected to its
    external battery pack by wires that exit the body. Since the power source
    and control elements are worn on a battery belt, the system allows the
    patient complete mobility.

        The electric LVAS may not be sold commercially in the U.S. until it
    has received approval from the FDA. In December 1996, the Company began
    actively working with the FDA on the PMA application for commercial
    approval of the electric LVAS used as a bridge to transplant. In December
    1995, the FDA approved the protocol for conducting clinical trials of the
    electric LVAS as an alternative to medical therapy. The trial is expected
    to compare the results of approved patients using the device to a similar
    number using drug therapy. In August 1995, the electric LVAS was awarded
    the CE Mark, allowing commercial sale of this system in all European
    Community countries. The electric system is used as a bridge to
    transplant in the U.S. and Europe, and is also implanted as an
    alternative to heart transplant in Europe.

    Government Regulation

        The Company's products and its research, development, and
    manufacturing activities are subject to regulation by numerous
    governmental authorities in the United States and other countries. In the
    United States, medical devices are subject to rigorous FDA review. The
    Federal Food, Drug, and Cosmetic Act (the FDC Act), the Public Health
    Services Act, and other federal statutes and regulations govern or

                                        5PAGE
<PAGE>
    influence the testing, manufacture, safety, labeling, storage, record
    keeping, reporting, approval, advertising, and promotion of products such
    as those offered by the Company. Noncompliance with applicable
    requirements can result in fines, recalls or seizures of products, total
    or partial suspension of production, and criminal prosecution.

        Pursuant to the Medical Device Amendments of 1976 (the 1976
    Amendments) to the FDC Act, and regulations promulgated thereunder,
    medical devices intended for human use are classified into three
    categories, Classes I, II, and III, which are subject to varying degrees
    of regulatory control.

        The Company's LVAS is classified as a Class III medical device under
    the FDC Act, the classification generally given to life-sustaining or
    supporting and implantable devices. Class III devices require clinical
    testing to ensure safety and effectiveness. The first stage of obtaining
    formal FDA market approval for a Class III device is submission of an
    application for an IDE. The IDE application must be supported by data,
    typically including the results of animal and mechanical testing. If
    approved, the IDE permits clinical evaluations of significant risk
    devices on human subjects under controlled experimental conditions by
    designated qualified medical institutions. To obtain an IDE, approval of
    the investigational plan for the applicable system is required from the
    institutional review board within each participating medical institution
    as well as from the FDA.

        The second stage of formal FDA market approval is the PMA
    application, which is submitted after sufficient data has been compiled
    under the IDE. The FDA will grant market approval if it finds that the
    safety and effectiveness of the product has been sufficiently
    demonstrated, and that the product complies with all applicable
    performance and manufacturing standards. In addition, any design change
    to an approved device must be approved by the FDA pursuant to a
    supplement to the applicable PMA application. The process of submitting
    and obtaining FDA approval of a PMA application can take several years or
    more, and is inherently uncertain. No assurance can be given that any of
    the products under development by the Company currently or in the future,
    including the electric LVAS, will be approved by the FDA for commercial
    sale.

        The Company is also subject to the FDA's Good Manufacturing Practice
    (GMP) regulations. These regulations require that the Company manufacture
    its systems and maintain its records in a prescribed manner. The FDA
    inspects the Company's facilities for compliance with GMP. If the Company
    is found not to be in compliance, the FDA has broad powers to issue
    recalls, enjoin future violations, and assess civil and criminal
    penalties against the Company, its officers, and its employees. In
    addition to GMP, the Company must adhere to quality standards applicable
    to European Community member countries and other countries where the
    Company sells its systems. The Company is also subject to registration
    and inspection requirements of state regulatory agencies.

        Sales of medical devices outside the United States are subject to
    foreign regulatory requirements that vary widely from country to country.
    Whether or not FDA approval has been obtained, approval of a device by a

                                        6PAGE
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    comparable regulatory authority of a foreign country generally must be
    obtained prior to the commencement of marketing in those countries. The
    time required to obtain such approvals may be longer or shorter than that
    required for FDA approval.

        No FDA approval is required to export a device that is legally
    marketed in the United States by the exporting company. Unapproved Class
    III devices may also be exported without FDA approval to any country if
    the device complies with the law of that country and has valid marketing
    authorization in at least one of the following: Australia, Canada,
    Israel, Japan, New Zealand, Switzerland, South Africa, or the European
    Union or a country in the European Economic Area (listed countries).
    Similarly, no FDA approval is required to export an investigational
    device to a listed country as long as the proposed investigational use is
    in accord with the importing country's laws. However, FDA approval is
    required to export an unapproved Class III device that does not have
    marketing authorization in one of the listed countries or to export an
    investigational device to a nonlisted country. In such cases, the FDA
    must determine that exportation of the unapproved or investigational
    device is not contrary to the public health and safety and has the
    approval of the country to which it is intended for export.

    Third Party Reimbursement

        The HeartMate air-driven LVAS is the only implantable, bridge to
    transplant, ventricular-assist system approved for commercial sale in the
    U.S. by the FDA.

        In November 1995, the U.S. Health Care Finance Administration (HCFA)
    issued a decision that extends Medicare coverage to the Company's
    HeartMate air-driven LVAS. Part of the U.S. Department of Health and
    Human Services, HCFA is responsible for establishing coverage and
    reimbursement policies for Medicare and recommending guidelines for
    Medicaid. Many third party payers review HCFA recommendations to
    establish their own reimbursement policies. Several major nongovernment
    insurers have already agreed to offer coverage for the air-driven LVAS.
    Additional insurers are reviewing the clinical results of the device, and
    additional coverage decisions will be forthcoming.

        Additionally, the HCFA coding committee has established a detailed
    resource code to be used when an implantable assist device, such as the
    HeartMate air-driven LVAS, is employed. This will facilitate collection
    of data on medical costs as well as resource information that may be used
    in establishing a Diagnosis Related Group (DRG) specific to
    ventricular-assist systems. HCFA and most states require that DRGs be
    used in determining the amount of reimbursement for particular
    procedures.

        Sales of the Company's systems will depend to a large degree upon the
    availability of reimbursement for the implantation of the devices. Even
    though reimbursement has been established by HCFA and by several
    nongovernment insurers, the amount of available reimbursement may change,
    and reimbursement may be denied by an insurer under certain
    circumstances, including determination that a procedure was not the most
    cost-effective treatment method, was experimental, or was used for an

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    unapproved indication. No assurance can be given that additional
    third-party reimbursement for the HeartMate air-driven LVAS will be
    granted within a reasonable period of time, or at all, and the Company
    cannot predict what effect the future policies of government entities and
    insurers will have on the sale of the Company's devices. The
    unavailability of third-party reimbursement for procedures involving the
    Company's systems would have a material adverse effect on the Company's
    business.

    Raw Materials

        Certain raw materials used in the manufacture of the Company's LVAS
    are available from only one or two suppliers. The Company is making
    efforts to minimize the risks associated with sole sources and ensure
    long-term availability, including qualifying alternative materials and
    components or developing alternative sources for materials and components
    supplied by a single source. Although the Company believes that it has
    adequate supplies of materials and components to meet demand for the LVAS
    for the foreseeable future, no assurance can be given that the Company
    will not experience shortages of certain materials or components in the
    future that could delay shipments of the LVAS.

        The cost to the Company to evaluate and test alternative materials
    and components and the time necessary to obtain FDA approval for these
    materials or components are inherently difficult to determine because
    both time and cost are dependent on at least two factors: the similarity
    of the alternative materials or components to the original materials or
    components, and the amount of third-party testing that may have already
    been completed on alternative materials or components. There can be no
    assurance that the substitution of alternative materials or components
    will not cause delays in the Company's LVAS development program or
    adversely affect the Company's ability to manufacture and ship LVAS to
    meet demand.

    Intellectual Property

        The Company's policy is to protect its intellectual property rights
    relating to its work on cardiac-support systems including, if
    appropriate, applying for patents in the U.S. and foreign countries.
    Thermedics has granted the Company a royalty-free license to use the
    Dermaport(R) access device and Tecoflex(R) biomaterial in its LVAS.
    Although some of these patent rights may provide the Company with a
    competitive advantage, the Company primarily relies on its know-how and
    trade secrets developed over 30 years of research, development, and
    fabrication of cardiac-assist devices. The Company has received
    correspondence from a third party alleging that the textured surface of
    the LVAS housing infringes certain patent rights of such third party. The
    third party has offered the Company a license, which the Company elected
    not to accept. Although the Company believes that it has meritorious
    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 if any litigation were to begin. The Company seeks to
    protect its proprietary information, but there can be no assurance that
    others will neither develop independently the same or similar information

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    nor obtain access to information that the Company believes is
    proprietary. Moreover, there can be no assurance that others will not
    claim that the Company's activities infringe their intellectual property
    rights.

    Backlog

        The Company's backlog of firm orders was approximately $1,914,000 and
    $1,351,000 as of December 28, 1996, and December 30, 1995, respectively.
    The Company believes that substantially all of the backlog at December
    28, 1996, will be shipped or completed during the next 12 months.

    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. The requirement of obtaining FDA approval for commercial
    sale of an LVAS in the U.S. is a significant barrier to entry into the
    U.S. market for these devices. There can be no assurance, however, 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 that 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. Among products that have been approved for
    commercial sale, the Company competes primarily on the basis of
    performance, service capability, and price. Competition in the market for
    medical devices is also significantly affected by the reimbursement
    policies of government and private insurers. Any product for which
    reimbursement is not available from such third-party payors will be at a
    significant competitive disadvantage.

    Research and Development

        During 1996, 1995, and 1994, the Company expended approximately
    $3,839,000, $3,324,000, and $3,437,000, respectively, on internally
    sponsored research and development programs. Approximately 46
    professional employees were engaged full-time in the Company's research
    and development activities at December 28, 1996. 

    Environmental Protection Regulations

        The Company believes that compliance by the Company with federal,
    state, and local environmental protection regulations will not have a
    material adverse effect on its capital expenditures, earnings, or
    competitive position.
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    Number of Employees

        As of December 28, 1996, the Company had a total of 154 employees.
    None of the Company's employees are represented by a labor union, and the
    Company considers its relations with its employees to be good.

    (d) Financial Information about Exports by Domestic Operations

        Financial information about exports by domestic operations is
    summarized in Note 11 to Consolidated Financial Statements in the
    Registrant's 1996 Annual Report to Shareholders and is incorporated
    herein by reference.

    (e)  Executive Officers of the Registrant

                                       Present Title (Year First Became
    Name                          Age  Executive Officer)
    ----------------------------  ---  ----------------------------------
    Victor L. Poirier             55  President and Chief Executive
                                       Officer (1988)
    John N. Hatsopoulos           62  Vice President and Chief Financial
                                       Officer (1988)
    Betty A. Silverstein Russell  47  Senior Vice President (1989)
    Timothy J. Krauskopf          35  Vice President, Regulatory
                                       Affairs (1995)
    Paul F. Kelleher              54  Chief Accounting Officer (1988)

        Each executive officer serves until his or her successor is chosen or
    appointed by the Board of Directors and qualified or until earlier
    resignation, death, or removal. All executive officers, except Mr.
    Krauskopf, have held comparable positions for at least five years with
    the Company, Thermedics, or Thermo Electron. Mr. Poirier devotes
    substantially all of his time to the affairs of the Company, but also
    devotes a portion of his time to the affairs of Thermedics. Messrs.
    Hatsopoulos and Kelleher are full-time employees of Thermo Electron, but
    devote such time to the affairs of the Company as the Company's needs
    reasonably require. Mr. Krauskopf was previously Director of Regulatory
    Affairs of the Company from 1993 to 1995, and prior to that, was Senior
    Regulatory Affairs Coordinator at USCI division of C.R. Bard, Inc. from
    1992 to 1993, and worked in clinical affairs at Carbomedics, Inc. from
    1989 to 1992.


    Item 2. Properties

        The Company subleases approximately 27,300 square feet of space in
    Thermedics' corporate headquarters in Woburn, Massachusetts, pursuant to
    a sublease expiring in 1999. The Company also occupies approximately
    11,000 square feet of office and research facilities in Rancho Cordova,
    California, pursuant to a lease expiring in 2000. Subsequent to year-end
    1996, the Company subleased approximately 8,000 square feet of office and
    research facilities in Chelmsford, Massachusetts, from Thermedics
    Detection, Inc., a majority-owned subsidiary of Thermedics, pursuant to a
    two-year lease agreement. The Company believes that these facilities are
    in good condition and are suitable for its present operations.

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    Item 3. Legal Proceedings

        Not applicable.


    Item 4. Submission of Matters to a Vote of Security Holders

        Not applicable.


                                     PART II

    Item 5. Market for Registrant's Common Equity and Related Stockholder
            Matters

        Information concerning the market and market price for the
    Registrant's common stock, $.10 par value, and dividend policy is
    included under the sections labeled "Common Stock Market Information" and
    "Dividend Policy" in the Registrant's 1996 Annual Report to Shareholders
    and is incorporated herein by reference.


    Item 6. Selected Financial Data

        The information required under this item is included under the
    sections labeled "Selected Financial Information" and "Dividend Policy"
    in the Registrant's 1996 Annual Report to Shareholders and is
    incorporated herein by reference.


    Item 7. Management's Discussion and Analysis of Financial Condition and
            Results of Operations

        The information required under this item is included under the
    heading "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" in the Registrant's 1996 Annual Report to
    Shareholders and is incorporated herein by reference.


    Item 8. Financial Statements and Supplementary Data

        The Registrant's Consolidated Financial Statements as of December 28,
    1996 and Supplementary Data are included in the Registrant's 1996 Annual
    Report to Shareholders and are incorporated herein by reference.


    Item 9. Changes in and Disagreements with Accountants on Accounting and
            Financial Disclosure

        Not applicable.
                                       11PAGE
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                                    PART III

    Item 10. Directors and Executive Officers of the Registrant

        The information concerning directors required under this item is
    incorporated herein by reference from the material contained under the
    caption "Election of Directors" in the Registrant's definitive proxy
    statement to be filed with the Securities and Exchange Commission
    pursuant to Regulation 14A, not later than 120 days after the close of
    the fiscal year. The information concerning delinquent filers pursuant to
    Item 405 of Regulation S-K is incorporated herein by reference from the
    material contained under the heading "Section 16(a) Beneficial Ownership
    Reporting Compliance" under the caption "Stock Ownership" in the
    Registrant's definitive proxy statement to be filed with the Securities
    and Exchange Commission pursuant to Regulation 14A, not later than 120
    days after the close of the fiscal year.


    Item 11. Executive Compensation

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Executive
    Compensation" in the Registrant's definitive proxy statement to be filed
    with the Securities and Exchange Commission pursuant to Regulation 14A,
    not later than 120 days after the close of the fiscal year.


    Item 12. Security Ownership of Certain Beneficial Owners and Management

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Stock Ownership"
    in the Registrant's definitive proxy statement to be filed with the
    Securities and Exchange Commission pursuant to Regulation 14A, not later
    than 120 days after the close of the fiscal year.


    Item 13. Certain Relationships and Related Transactions

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Relationship
    with Affiliates" in the Registrant's definitive proxy statement to be
    filed with the Securities and Exchange Commission pursuant to Regulation
    14A, not later than 120 days after the close of the fiscal year.


                                       12PAGE
<PAGE>
                                     PART IV


    Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K

    (a,d)   Financial Statements and Schedules

            (1) The financial statements set forth in the list below are
                filed as part of this Report.

            (2) The financial statement schedule set forth in the list below
                is filed as part of this Report.

            (3) Exhibits filed herewith or incorporated herein by reference
                are set forth in Item 14(c) below.

            List of Financial Statements and Schedules Referenced in this
            Item 14

             Information incorporated by reference from Exhibit 13 filed
             herewith:

                Consolidated Statement of Income
                Consolidated Balance Sheet
                Consolidated Statement of Cash Flows
                Consolidated Statement of Shareholders' Investment
                Notes to Consolidated Financial Statements
                Report of Independent Public Accountants

             Financial Statement Schedules filed herewith:

                Schedule II: Valuation and Qualifying Accounts

             All other schedules are omitted because they are not applicable
             or not required, or because the required information is shown
             either in the financial statements or in the notes thereto.

    (b)      Reports on Form 8-K

             None.

    (c)      Exhibits

             See Exhibit Index on the page immediately preceding exhibits.



                                       13PAGE
<PAGE>
                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
   Exchange Act of 1934, the Registrant has duly caused this report to be
   signed on its behalf by the undersigned, thereunto duly authorized.

   Date: March 14, 1997            THERMO CARDIOSYSTEMS INC.

                                   By: Victor L. Poirier
                                       ---------------------------------
                                       Victor L. Poirier
                                       President and Chief Executive Officer

        Pursuant to the requirements of the Securities Exchange Act of 1934,
   this report has been signed below by the following persons on behalf of the
   Registrant and in the capacities indicated, as of March 14, 1997.

   Signature                          Title
   ---------                          -----
   By: Victor L. Poirier              President, Chief Executive Officer, and
       ------------------------
       Victor L. Poirier                Director

   By: John N. Hatsopoulos            Vice President and Chief Financial
       ------------------------
      John N. Hatsopoulos               Officer

   By: Paul F. Kelleher               Chief Accounting Officer
       ------------------------
       Paul F. Kelleher

   By: Walter J. Bornhorst            Director
       ------------------------
       Walter J. Bornhorst

   By: Richard W.K. Chapman           Director
       ------------------------
       Richard W.K. Chapman

   By: Elias P. Gyftopoulos           Director
       ------------------------
       Elias P. Gyftopoulos

   By: Robert C. Howard               Director
       ------------------------
       Robert C. Howard

   By: Leonard Laster                 Director
       ------------------------
       Leonard Laster

   By: John W. Wood Jr.               Chairman of the Board and Director
       ------------------------
       John W. Wood Jr.

   By: Nicholas T. Zervas             Director
       -------------------------
       Nicholas T. Zervas
                                       14PAGE
<PAGE>
                    Report of Independent Public Accountants
                    ----------------------------------------


    To the Shareholders and Board of Directors of Thermo Cardiosystems Inc.:

        We have audited, in accordance with generally accepted auditing
    standards, the financial statements included in Thermo Cardiosystems
    Inc.'s Annual Report to Shareholders incorporated by reference in this
    Form 10-K, and have issued our report thereon dated February 6, 1997. Our
    audits were made for the purpose of forming an opinion on those
    statements taken as a whole. The schedule listed in Item 14 on page 13 is
    the responsibility of the Company's management and is presented for
    purposes of complying with the Securities and Exchange Commission's rules
    and is not part of the basic financial statements. The schedule has been
    subjected to the auditing procedures applied in the audits of the basic
    financial statements and, in our opinion, fairly states in all material
    respects the financial data required to be set forth therein in relation
    to the basic financial statements taken as a whole.



                                            Arthur Andersen LLP



    Boston, Massachusetts
    February 6, 1997



                                       15PAGE
<PAGE>
    SCHEDULE II

                            THERMO CARDIOSYSTEMS INC.

                        Valuation and Qualifying Accounts

                                 (In thousands)

                            Balance at   Provision                Balance
                             Beginning  Charged to     Accounts    at End
    Description                of Year     Expense  Written-off   of Year
    --------------------    ----------  ----------  -----------   -------
    Year Ended
      December 28, 1996
        Allowance for
          Doubtful Accounts      $ 309      $ 165        $   -      $ 474

    Year Ended
      December 30, 1995
        Allowance for
          Doubtful Accounts      $ 225      $ 120        $ (36)     $ 309

    Year Ended
      December 31, 1994
        Allowance for
          Doubtful Accounts      $  80      $ 170        $ (25)     $ 225








                                       16PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------

      3.1      Articles of Organization, as filed on August 18,
               1988, and as amended on October 26, 1988, January 6,
               1989, and May 23, 1990 (filed as Exhibit 3(a) to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 33-34737] and incorporated herein by reference)
               and as amended on October 25, 1993 (filed as Exhibit
               3(c) to the Registrant's Quarterly Report on Form
               10-Q for the quarter ended October 2, 1993 [File No.
               1-10114] and incorporated herein by reference).

      3.2      By-Laws of the Registrant (filed as Exhibit 3(b) to
               the Registrant's Registration Statement on Form S-1
               [Reg. No. 33-25144] and incorporated herein by
               reference).

      4.1      Form of Guarantee Agreement between the Registrant
               and Thermo Electron (filed as Exhibit 4(b) to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 33-25144] and incorporated herein by reference).

      4.2      Form of Amendment Number 1 to Guarantee Agreement
               between the Registrant and Thermo Electron (filed as
               Exhibit 4(e) to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 33-34737] and
               incorporated herein by reference).

      4.3      Fiscal Agency Agreement dated January 5, 1993, among
               Thermo Electron, the Registrant, and Chemical Bank
               (filed as Exhibit 4.11 to the Registrant's Annual
               Report on Form 10-K for the fiscal year ended January
               1, 1994 [File No. 1-10114] and incorporated herein by
               reference).

      4.4      Guarantee Reimbursement Agreement dated February 7,
               1994, among the Registrant, Thermo Voltek Corp.,
               Thermedics, and Thermo Electron (filed as Exhibit 4.4
               to Thermedics' Annual Report on Form 10-K for the
               fiscal year ended January 1, 1994 [File No. 1-9567]
               and incorporated herein by reference).

     10.1      Amended and Restated Corporate Services Agreement
               dated January 3, 1993, between Thermo Electron and
               the Registrant (filed as Exhibit 10(b) to the
               Registrant's Annual Report on Form 10-K for the year
               ended January 2, 1993 [File No. 1-10114] and
               incorporated herein by reference).

                                       17PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------

     10.2      Sublease dated August 19, 1988, between the
               Registrant and Thermedics, as amended by Amendment
               No. 1 dated January 1, 1990 (filed as Exhibit 10(c)
               to the Registrant's Annual Report on Form 10-K for
               the fiscal year ended December 30, 1989 [File No.
               1-10114] and incorporated herein by reference).

     10.3      Form of Indemnification Agreement between the
               Registrant and its officers and directors (filed as
               Exhibit 10(d) to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 33-25144] and
               incorporated herein by reference).

     10.4      Thermo Electron Corporate Charter, as amended and
               restated effective January 3, 1993 (filed as Exhibit
               10(e) to the Registrant's Annual Report on Form 10-K
               for the fiscal year ended January 2, 1993 [File No.
               1-10114] and incorporated herein by reference).

     10.5      Intellectual Property Cross-License Agreement between
               Thermedics and the Registrant dated August 19, 1988
               (filed as Exhibit 10(i) to the Registrant's
               Registration Statement on Form S-1 [Reg. No.
               33-25144] and incorporated herein by reference).

     10.6      Agreement dated May 26, 1993, between The Polymer
               Technology Group Incorporated and the Registrant
               (filed as Exhibit 10(cc) to the Registrant's
               Quarterly Report on Form 10-Q for the quarter ended
               July 3, 1993 [File No. 1-10114] and incorporated
               herein by reference).

     10.7      Amended and Restated Master Repurchase Agreement
               dated July 2, 1996, between the Registrant and Thermo
               Electron.

    10.8-10.17 Reserved.

     10.18     Equity Incentive Plan of the Registrant (filed as
               Attachment A to the Proxy Statement dated May 5,
               1994, of the Registrant [File No. 1-10114] and
               incorporated herein by reference).

     10.19     Deferred Compensation Plan for Directors of the
               Registrant (filed as Exhibit 10(h) to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 33-25144] and incorporated herein by reference).

                                       18PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------

     10.20     Directors Stock Option Plan of the Registrant (filed
               as Exhibit 10.20 to the Registrant's Annual Report on
               Form 10-K for the fiscal year ended December 31, 1994
               [File No. 1-10114] and incorporated herein by
               reference).

     10.21     Incentive Stock Option Plan of the Registrant (filed
               as Exhibit 10(f) to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 33-25144] and
               incorporated herein by reference). (Maximum number of
               shares issuable in the aggregate under this plan and
               the Registrant's Nonqualified Stock Option Plan is
               1,715,625 shares, after adjustment to reflect share
               increase approved in 1992, 3-for-2 stock split
               effected in January 1990, 5-for-4 stock split
               effected in May 1990, 2-for-1 stock split effected in
               November 1993, and 3-for-2 stock split effected in
               May 1996.)

     10.22     Nonqualified Stock Option Plan of the Registrant
               (filed as Exhibit 10(g) to the Registrant's
               Registration Statement on Form S-1 [Reg. No.
               33-25144] and incorporated herein by reference).
               (Maximum number of shares issuable in the aggregate
               under this plan and the Registrant's Incentive Stock
               Option Plan is 1,715,625 shares, after adjustment to
               reflect share increase approved in 1992, 3-for-2
               stock split effected in January 1990, 5-for-4 stock
               split effected in May 1990, 2-for-1 stock split
               effected in November 1993, and 3-for-2 stock split
               effected in May 1996.)

               In addition to the stock-based compensation plans of
               the Registrant, the executive officers of the
               Registrant may be granted awards under stock-based
               compensation plans of Thermo Electron and Thermedics
               for services rendered to the Registrant or to such
               affiliated corporations. Thermo Electron's plans were
               filed as Exhibits 10.21 through 10.44 to the Annual
               Report on Form 10-K of Thermo Electron for the year
               ended December 30, 1995 [File No. 1-8002] and as
               Exhibit 10.19 to the Annual Report on Form 10-K of
               Trex Medical Corporation for the fiscal year ended
               September 28, 1996 [File No. 1-11827] and Thermedics'
               plans were filed as Exhibits 10.18 through 10.22 to
               the Annual Report on Form 10-K of Thermedics for the
               year ended December 28, 1996 [File No. 1-9567] and
               are incorporated herein by reference.

     10.23     Restated Stock Holdings Assistance Plan and Form of
               Promissory Note.

                                       19PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------

       11      Statement re: Computation of Earnings per Share.

       13      Annual Report to Shareholders for the year ended
               December 28, 1996 (only those portions incorporated
               herein by reference).

       21      Subsidiaries of the Registrant.

       23      Consent of Arthur Andersen LLP.

       27      Financial Data Schedule.


                                                                Exhibit 10.7
                AMENDED AND RESTATED MASTER REPURCHASE AGREEMENT


             The Master Repurchase Agreement dated as of July 2, 1996
        between Thermo Electron Corporation, a Delaware corporation
        ("Seller"), and Thermo Cardiosystems Inc., a Delaware corporation
        (the "Buyer"), is hereby amended and restated in its entirety as
        follows on and as of December 28, 1996.

        1.   Applicability

             From time to time Buyer and Seller may enter into
        transactions in which Seller agrees to transfer to Buyer certain
        securities and/or financial instruments ("Securities") against
        the transfer of funds by Buyer, with a simultaneous agreement by
        Buyer to transfer to Seller such Securities on demand, against
        the transfer of funds by Seller.  Each such transaction shall be
        referred to herein as a "Transaction" and shall be governed by
        this Agreement, unless otherwise agreed in writing.

        2.   Definitions

             (a)   "Act of Insolvency", with respect to either party (i)
        the commencement by such party as debtor of any case or
        proceeding under any bankruptcy, insolvency, reorganization,
        liquidation, dissolution or similar law, or such party seeking
        the appointment of a receiver, trustee, custodian or similar
        official for such party or any substantial part of its property;
        or (ii) the commencement of any such case or proceeding against
        such party, or another seeking such an appointment, which (A) is
        consented to or not timely contested by such party, (B) results
        in the entry of an order for relief, such an appointment or the
        entry of an order having a similar effect, or (C) is not
        dismissed within 15 days; or (iii) the making by a party of a
        general assignment for the benefit of creditors; or (iv) the
        admission in writing by a party of such party's inability to pay
        such party's debts as they become due; 

             (b)  "Additional Purchased Securities", Securities provided
        by Seller to Buyer pursuant to Paragraph 4(a) hereof; 

             (c)  "Income", with respect to any Security at any time, any
        principal thereof then payable and all interest, dividends or
        other distributions thereon; 

             (d)  "Market Value", with respect to any Securities as of
        any date, the price for such Securities on such date obtained
        from a generally recognized source agreed to by the parties or
        the most recent closing bid quotation from such a source, plus
        accrued Income to the extent not included therein (other than any
        Income transferred to Seller pursuant to Paragraph 6 hereof) as
        of such date (unless contrary to market practice for such
        Securities);
PAGE
<PAGE>
             (e)  "Other Buyers", third parties that have entered into an
        agreement with Seller that is substantially similar to this
        Agreement; 

             (f)  "Pricing Rate", a rate equal to the Commercial Paper
        Composite rate for 90-day maturities provided by Merrill Lynch,
        Pierce, Fenner & Smith Incorporated (or, if such rate is not
        available, a substantially equivalent rate agreed to by Buyer and
        Seller) plus 25 basis points, which rate shall be adjusted on the
        first business day of each fiscal quarter and shall be in effect
        for the entirety such fiscal quarter;
         
             (g)  "Purchase Price", the price at which Purchased
        Securities are transferred by Seller to Buyer; 

             (h)  "Purchased Securities", the Securities transferred by
        Seller to Buyer in a Transaction hereunder, and any Securities
        substituted therefor in accordance with Paragraph 9 hereof.  The
        term "Purchased Securities" with respect to any Transaction at
        any time also shall include Additional Purchase Securities
        transferred pursuant to Paragraph 4(a) and shall exclude
        Securities returned pursuant to Paragraph 4(b);  

             (i)  "Repurchase Collateral Account", a book account
        maintained by Seller containing, among other Securities, the
        Purchased Securities; and

             (j)  "Repurchase Price", for any Purchased Security, an
        amount equal to the Purchase Price paid by Buyer to Seller for
        such Purchased Security. 

        3.   Transactions

             (a)  A Transaction may be initiated by Buyer upon the
        transfer of the Purchase Price to Seller's account.  Upon such
        transfer, Seller shall transfer to Buyer Purchased Securities
        having a Market Value equal to 103% of the Purchase Price.

             (b)  Purchased Securities shall be held in custody for Buyer
        by Seller in the Repurchase Collateral Account.  Seller shall
        indicate on its books for such account Buyer's ownership of the
        Purchased Securities.  Upon reasonable request from Buyer, Seller
        shall provide Buyer with a complete list of Purchased Securities
        owned by Buyer.  

             (c)  Upon demand by Buyer or Seller, Seller shall repurchase
        from Buyer, and Buyer shall sell to Seller, for the Repurchase
        Price all or any part of the Purchased Securities then owned by
        Buyer.

        4.   Margin Maintenance

             (a)  If at any time the aggregate Market Value of all
        Purchased Securities then owned by Buyer is less than 103% of the

                                        2PAGE
<PAGE>
        aggregate Repurchase Price for such Purchased Securities, then
        Seller shall transfer to Buyer additional Securities ("Additional
        Purchased Securities"), so that the aggregate Market Value of
        such Purchased Securities, including any such Additional
        Purchased Securities, will thereupon equal or exceed 103% of such
        aggregate Repurchase Price.

             (b)  If at any time the aggregate Market Value of all
        Purchased Securities then owned by Buyer exceeds 103% of the
        aggregate Repurchase Price for such Purchased Securities, then
        Seller may transfer Purchased Securities to Seller, so that the
        aggregate Market Value of such Purchased Securities will
        thereupon not exceed 103% of such aggregate Repurchase Price.

        5.   Interest Payments

             If during any fiscal month Buyer owned Purchased Securities,
        then on the first day of the next following fiscal month Seller
        shall pay to Buyer an amount equal to the sum of the aggregate
        Repurchase Prices of the Purchased Securities owned by Buyer at
        the close of each day during the preceding fiscal month divided
        by the number of days in such month and the product multiplied by
        the Pricing Rate times the number of days in such month divided
        by 360.

        6.   Income Payments and Voting Rights

             Where a particular Transaction's term extends over an Income
        payment date on the Purchased Securities subject to that
        Transaction, Buyer shall, on the date such Income is payable,
        transfer to Seller an amount equal to such Income payment or
        payments with respect to any Purchased Securities subject to such
        Transaction.  Seller shall retain all voting rights with respect
        to Purchased Securities sold to Buyer under this Agreement.


        7.   Security Interest

             Although the parties intend that all Transactions hereunder
        be sales and purchases and not loans, in the event any such
        Transactions are deemed to be loans, Seller shall be deemed to
        have pledged to Buyer as security for the performance by Seller
        of its obligations under each such Transaction and this
        Agreement, and shall be deemed to have granted to Buyer a
        security interest in, all of the Purchased Securities with
        respect to all Transactions hereunder and all proceeds thereof.

        8.   Payment and Transfer

             Unless otherwise mutually agreed, all transfers of funds
        hereunder shall be in immediately available funds.  As used
        herein with respect to Securities, "transfer" is intended to have

                                        3PAGE
<PAGE>
        the same meaning as when used in Section 8-313 of the
        Massachusetts Uniform Commercial Code or, where applicable, in
        any federal regulation governing transfers of the Securities.

        9.   Substitution

             Buyer hereby grants Seller the authority to manage, in
        Seller's sole discretion, the Purchased Securities held in
        custody for Buyer by Seller in the Repurchase Collateral Account.
        Buyer expressly agrees that Seller may (i) substitute other
        Securities for any Purchased Securities and (ii) commingle
        Purchased Securities with other Securities held in the Repurchase
        Collateral Account.  Substitutions shall be made by transfer to
        Buyer of such other Securities and transfer to Seller of the
        Purchased Securities for which substitution is being made.  After
        substitution, the substituted Securities shall be deemed to be
        Purchased Securities.  Securities which are substituted for
        Purchased Securities shall have a Market Value at the time of
        substitution equal to or greater than the Market Value of the
        Purchase Securities for which such Securities were substituted.

        10.  Representations

             Each of Buyer and Seller represents and warrants to the
        other that (i) it is duly authorized to execute and deliver this
        Agreement, to enter into the Transactions contemplated hereunder
        and to perform its obligations hereunder and has taken all
        necessary action to authorize such execution, delivery and
        performance, (ii) the person signing this Agreement on its behalf
        is duly authorized to do so on its behalf, (iii) it has obtained
        all authorizations of any governmental body required in
        connection with this Agreement and the Transactions hereunder and
        such authorizations are in full force and effect and (iv) the
        execution, delivery and performance of this Agreement and the
        Transactions hereunder will not violate any law, ordinance,
        charter, by-law or rule applicable to it or any agreement by
        which it is bound or by which any of its assets are affected.  On
        the date for any Transaction Buyer and Seller shall each be
        deemed to repeat all the foregoing representations made by it.

        11.  Events of Default

             In the event that (i) Seller fails to repurchase or Buyer
        fails to transfer Purchased Securities upon demand for repurchase
        from either Buyer or Seller, (ii) Seller or Buyer fails, after
        one business day's notice, to comply with Paragraph 4 hereof,
        (iii) Buyer fails to make payment to Seller pursuant to Paragraph
        6 hereof, (iv) Seller fails to comply with Paragraph 5 hereof,
        (v) an Act of Insolvency occurs with respect to Seller or Buyer,
        (vi) any representation made by Seller or Buyer shall have been
        incorrect or untrue in any material respect when made or repeated
        or deemed to have been made or repeated, or (vii) Seller or Buyer
        shall admit to the other its inability to, or its intention not

                                        4PAGE
<PAGE>
        to, perform any of its obligations hereunder (each an "Event of
        Default"):

             (a)  At the option of the nondefaulting party, exercised by
        written notice to the defaulting party (which option shall be
        deemed to have been exercised, even if no notice is given,
        immediately upon the occurrence of any Act of Insolvency), Seller
        shall become obligated to repurchase, and Buyer shall become
        obligated to sell, all Purchased Securities then owned by Buyer
        for the Repurchase Price of such Purchased Securities.

             (b)  If Seller is the defaulting party and Buyer exercises
        or is deemed to have exercised the option referred to in
        subparagraph (a) of this Paragraph, (i) the Seller's obligations
        hereunder to repurchase all Purchased Securities in such
        Transactions shall thereupon become immediately due and payable,
        (ii) all Income paid after such exercise or deemed exercise shall
        be retained by Buyer and applied to the aggregate unpaid
        Repurchase Prices owed by Seller, and (iii) Seller shall
        immediately deliver to Buyer any Purchased Securities subject to
        such Transactions then in Seller's possession.

             (c)  In all Transactions in which Buyer is the defaulting
        party, upon tender by Seller of payment of the aggregate
        Repurchase Prices for all such Transactions, Buyer's right, title
        and interest in all Purchased Securities subject to such
        Transactions shall be deemed transferred to Seller, and Buyer
        shall deliver all such Purchased Securities to Seller.

             (d)  After one business day's notice to the defaulting party
        (which notice need not be given if an Act of Insolvency shall
        have occurred, and which may be the notice given under
        subparagraph (a) of this Paragraph or the notice referred to in
        clause (ii) of the first sentence of this Paragraph), the
        nondefaulting party may: 

                  (i)  as to Transactions in which Seller is the
        defaulting party, (A) immediately sell, in a recognized market at
        such price or prices as Buyer may reasonably deem satisfactory,
        any or all Purchased Securities subject to such Transactions and
        apply the proceeds thereof to the aggregate unpaid Repurchase
        Prices and any other amounts owing by Seller hereunder or (B) in
        its sole discretion elect, in lieu of selling all or a portion of
        such Purchased Securities, to give Seller credit for such
        Purchased Securities in an amount equal to the price therefor on
        such date, obtained from a generally recognized source or the
        most recent closing bid quotation from such a source, against the
        aggregate unpaid Repurchase Prices and any other amounts owing by
        Seller hereunder; and

                  (ii)  as to Transactions in which Buyer is the
        defaulting party, (A) purchase securities ("Replacement
        Securities") of the same class and amount as any Purchased
        Securities that are not delivered by Buyer to Seller as required

                                        5PAGE
<PAGE>
        hereunder or (B) in its sole discretion elect, in lieu of
        purchasing Replacement Securities, to be deemed to have purchased
        Replacement Securities at the price therefor on such date,
        obtained from a generally recognized source or the most recent
        closing bid quotation from such a source.

             (e)  As to Transactions in which Buyer is the defaulting
        party, Buyer shall be liable to Seller (i) with respect to
        Purchased Securities (other than Additional Purchased
        Securities), for any excess of the price paid (or deemed paid) by
        Seller for Replacement Securities therefor over the Repurchase
        Price for such Purchased Securities and (ii) with respect to
        Additional Purchased Securities, for the price paid (or deemed
        paid) by Seller for the Replacement Securities therefor.  

             (g)  The defaulting party shall be liable to the
        nondefaulting party for the amount of all reasonable legal or
        other expenses incurred by the nondefaulting party in connection
        with or as a consequence of an Event of Default.

             (h)  The nondefaulting party shall have, in addition to its
        rights hereunder, any rights otherwise available to it under any
        other agreement or applicable law.

        12.  Single Agreement

             Buyer and Seller acknowledge that, and have entered hereinto
        and will enter into each Transaction hereunder in consideration
        of and in reliance upon the fact that, all Transactions hereunder
        constitute a single business and contractual relationship and
        have been made in consideration of each other.  Accordingly, each
        of Buyer and Seller agrees (i) to perform all of its obligations
        in respect of each Transaction hereunder, and that a default in
        the performance of any such obligations shall constitute a
        default by it in respect of all Transactions hereunder, (ii) that
        each of them shall be entitled to set off claims and apply
        property held by them in respect of any Transaction against
        obligations owing to them in respect of any other Transactions
        hereunder and (iii) that payments, deliveries and other transfers
        made by either of them in respect of any Transaction shall be
        deemed to have been made in consideration of payments, deliveries
        and other transfers in respect of any other Transactions
        hereunder, and the obligations to make any such payments,
        deliveries and other transfers may be applied against each other
        and netted.

        13.  Entire Agreement; Severability

             This Agreement shall supersede any existing agreements
        between the parties containing general terms and conditions for
        repurchase transactions.  Each provision and agreement and
        agreement herein shall be treated as separate and independent
        from any other provision or agreement herein and shall be

                                        6PAGE
<PAGE>
        enforceable notwithstanding the unenforceability of any such
        other provision or agreement.

        14.  Non-assignability; Termination

             The rights and obligations of the parties under this
        Agreement and under any Transactions shall not be assigned by
        either party without the prior written consent of the other
        party.  Subject to the foregoing, this Agreement and any
        Transactions shall be binding upon and shall inure to the benefit
        of the parties and their respective successors and assigns.  This
        Agreement may be canceled by either party upon giving written
        notice to the other, except that this Agreement shall,
        notwithstanding such notice, remain applicable to any
        Transactions then outstanding.

        15.  Governing Law

             This Agreement shall be governed by the laws of the
        Commonwealth of Massachusetts without giving effect to the
        conflict of law principles thereof.

        16.  No Waivers, Etc.

             No express or implied waiver of any Event of Default by
        either party shall constitute a waiver of any other Event of
        Default and no exercise of any remedy hereunder by any party
        shall constitute a wavier of its right to exercise any other
        remedy hereunder.  No modification or waiver of any provision of
        this Agreement and no consent by any party to a departure
        herefrom shall be effective unless and until such shall be in
        writing and duly executed by both of the parties hereto. 

        17.  Intent

             (a)  The parties recognize that each Transaction is a
        "repurchase agreement" as that term is defined in Section 101 of
        Title 11 of the United States Code, as amended (except insofar as
        the type of Securities subject to such Transaction or the term of
        such Transaction would render such definition inapplicable), and
        a "securities contract" as that term is defined in Section 741 of
        Title 11 of the United States Code, as amended.

             (b)  It is understood that either party's right to liquidate
        Securities delivered to it in connection with Transactions
        hereunder or to exercise any other remedies pursuant to Paragraph
        11 hereof, is a contractual right to liquidate such Transaction
        as described in Sections 555 and 559 of Title 11 of the United
        States Code, as amended.
                                        7PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have executed this Agreement
        as of December 28, 1996.


        THERMO ELECTRON CORPORATION        THERMO CARDIOSYSTEMS INC.


        By:_____________________________   By:_______________________

        Name:     Jonathan W. Painter      Name:     Victor Poirier
        Title:    Treasurer                Title:    President



                                                          Exhibit 10.23
                            THERMO CARDIOSYSTEMS INC.

                      RESTATED STOCK HOLDING ASSISTANCE PLAN


        SECTION 1.   Purpose.

             The purpose of this Plan is to benefit Thermo Cardiosystems
        Inc. (the "Company") and its stockholders by encouraging Key
        Employees to acquire and maintain share ownership in the Company,
        by increasing such employees' proprietary interest in promoting
        the growth and performance of the Company and its subsidiaries
        and by providing for the implementation of the Stock Holding
        Policy.  

        SECTION 2.     Definitions.

             The following terms, when used in the Plan, shall have the
        meanings set forth below:

             Committee:   The Human Resources Committee of the Board of
        Directors of the Company as appointed from time to time.

             Common Stock:   The common stock of the Company and any
        successor thereto.

             Company:   Thermo Cardiosystems Inc., a Massachusetts
        corporation.

             Stock Holding Policy:   The Stock Holding Policy of the
        Company, as adopted by the Committee and as in effect from time
        to time.

             Key Employee:   Any employee of the Company or any of its
        subsidiaries, including any officer or member of the Board of
        Directors who is also an employee, as designated by the
        Committee, and who, in the judgment of the Committee, will be in
        a position to contribute significantly to the attainment of the
        Company's strategic goals and long-term growth and prosperity.

             Loans:   Loans extended to Key Employees by the Company
        pursuant to this Plan.

             Plan:   The Thermo Cardiosystems Inc. Stock Holding
        Assistance Plan, as amended from time to time.

        SECTION 3.     Administration.

             The Plan and the Stock Holding Policy shall be administered
        by the Committee, which shall have authority to interpret the
        Plan and the Stock Holding Policy and, subject to their
        provisions, to prescribe, amend and rescind any rules and
        regulations and to make all other determinations necessary or
        desirable for the administration thereof.  The Committee's
PAGE
<PAGE>
        interpretations and decisions with regard to the Plan and the
        Stock Holding Policy and such rules and regulations as may be
        established thereunder shall be final and conclusive.  The
        Committee may correct any defect or supply any omission or
        reconcile any inconsistency in the Plan or the Stock Holding
        Policy, or in any Loan in the manner and to the extent the
        Committee deems desirable to carry it into effect.  No member of
        the Committee shall be liable for any action or omission in
        connection with the Plan or the Stock Holding Policy that is made
        in good faith.

        SECTION 4.     Loans and Loan Limits.

             The Committee has determined that the provision of Loans
        from time to time to Key Employees in such amounts as to cause
        such Key Employees to comply with the Stock Holding Policy is, in
        the judgment of the Committee, reasonably expected to benefit the
        Company and authorizes the Company to extend Loans from time to
        time to Key Employees in such amounts as may be requested by such
        Key Employees in order to comply with the Stock Holding Policy.
        Such Loans may be used solely for the purpose of acquiring Common
        Stock (other than upon the exercise of stock options or under
        employee stock purchase plans) in open market transactions or
        from the Company.

             Each Loan shall be full recourse and evidenced by a
        non-interest bearing promissory note substantially in the form
        attached hereto as Exhibit A (the "Note") and maturing in
        accordance with the provisions of Section 6 hereof, and
        containing such other terms and conditions, which are not
        inconsistent with the provisions of the Plan and the Stock
        Holding Policy, as the Committee shall determine in its sole and
        absolute discretion.

        SECTION 5.     Federal Income Tax Treatment of Loans.

             For federal income tax purposes, interest on Loans shall be
        imputed on any interest free Loan extended under the Plan.  A Key
        Employee shall be deemed to have paid the imputed interest to the
        Company and the Company shall be deemed to have paid said imputed
        interest back to the Key Employee as additional compensation.
        The deemed interest payment shall be taxable to the Company as
        income, and may be deductible to the Key Employee to the extent
        allowable under the rules relating to investment interest.  The
        deemed compensation payment to the Key Employee shall be taxable
        to the employee and deductible to the Company, but shall also be
        subject to employment taxes such as FICA and FUTA.

        SECTION 6.     Maturity of Loans.

             Each Loan to a Key Employee hereunder shall be due and
        payable on demand by the Company.  If no such demand is made,
        then each Loan shall mature and the principal thereof shall
        become due and payable in five equal annual installments from the

                                        2PAGE
<PAGE>
        payment of annual cash incentive compensation (referred to as
        bonus) to the Key Employee by the Company, beginning with the
        first such bonus payment to occur after the date of the Note
        evidencing the Loan, and on each of the next four bonus payment
        dates, provided that the Committee may, in its sole and absolute
        discretion, authorize such other maturity and repayment schedule
        as the Committee may determine.  Each Loan shall also become
        immediately due and payable in full, without demand, upon  the
        occurrence of any of the events set forth in the Note; provided
        that the Committee may, in its sole and absolute discretion,
        authorize an extension of the time for repayment of a Loan upon
        such terms and conditions as the Committee may determine.

        SECTION 7.     Amendment and Termination of the Plan.

             The Committee may from time to time alter or amend the Plan
        or the Stock Holding Policy in any respect, or terminate the Plan
        or the Stock Holding Policy at any time.  No such amendment or
        termination, however, shall alter or otherwise affect the terms
        and conditions of any Loan then outstanding to Key Employee
        without such Key Employee's written consent, except as otherwise
        provided herein or in the promissory note evidencing such Loan.

        SECTION 8.     Miscellaneous Provisions.

             (a)  No employee or other person shall have any claim or
        right to receive a Loan under the Plan, and no employee shall
        have any right to be retained in the employ of the Company due to
        his or her participation in the Plan.

             (b)  No Loan shall be made hereunder unless counsel for the
        Company shall be satisfied that such Loan will be in compliance
        with applicable federal, state and local laws.

             (c)  The expenses of the Plan shall be borne by the Company.

             (d)  The Plan shall be unfunded, and the Company shall not
        be required to establish any special or separate fund or to make
        any other segregation of assets to assure the making of any Loan
        under the Plan.

             (e)  Except as otherwise provided in Section 7 hereof, by
        accepting any Loan under the Plan, each Key Employee shall be
        conclusively deemed to have indicated his acceptance and
        ratification of, and consent to, any action taken under the Plan
        or the Stock Holding Policy by the Company, the Board of
        Directors of the Company or the Committee.

             (f)  The appropriate officers of the Company shall cause to
        be filed any reports, returns or other information regarding
        Loans hereunder, as may be required by any applicable statute,
        rule or regulation.

        SECTION 9.     Effective Date.

                                        3PAGE
<PAGE>
             The Plan and the Stock Holding Policy shall become effective
        upon approval and adoption by the Committee.


























                                        4PAGE
<PAGE>
                               EXHIBIT A TO STOCK HOLDING ASSISTANCE PLAN


                            THERMO CARDIOSYSTEMS INC.

                                 Promissory Note



        $_________                                                       
                                                Dated:____________


             For value received, ________________, an individual whose
        residence is located at _______________________ (the "Employee"),
        hereby promises to pay to Thermo Cardiosystems Inc. (the
        "Company"), or assigns, ON DEMAND, but in any case on or before
        [insert date which is the fifth anniversary of date of issuance]
        (the "Maturity Date"), the principal sum of [loan amount in
        words] ($_______), or such part thereof as then remains unpaid,
        without interest.  Principal shall be payable in lawful money of
        the United States of America, in immediately available funds, at
        the principal office of the Company or at such other place as the
        Company may designate from time to time in writing to the
        Employee. 

              Unless the Company has already made a demand for payment in
        full of this Note, the Employee agrees to repay the Company  an
        amount equal to 20% of the initial principal amount of the Note
        from the payment of annual cash incentive compensation (referred
        to as bonus) to the Employee by the Company, beginning with the
        first such bonus payment to occur after the date of this Note,
        and on each of the next four bonus payment dates.  Any amount
        remaining unpaid under this Note, if no demand has been made by
        the Company, shall be due and payable on the Maturity Date.

             This Note may be prepaid at any time or from time to time,
        in whole or in part, without any premium or penalty.  The
        Employee acknowledges and agrees that the Company has advanced to
        the Employee the principal amount of this Note pursuant to the
        Company's Stock Holding Assistance Plan, and that all terms and
        conditions of such Plan are incorporated herein by reference.  

             The unpaid principal amount of this Note shall be and become
        immediately due and payable without notice or demand, at the
        option of the Company, upon the occurrence of any of the
        following events:

                  (a)  the termination of the Employee's employment with
        the Company, with or without cause, for any reason or for no
        reason;

                  (b)  the death or disability of the Employee;
                                        5PAGE
<PAGE>
                  (c)  the failure of the Employee to pay his or her
        debts as they become due, the insolvency of the Employee, the
        filing by or against the Employee of any petition under the
        United States Bankruptcy Code (or the filing of any similar
        petition under the insolvency law of any jurisdiction), or the
        making by the Employee of an assignment or trust mortgage for the
        benefit of creditors or the appointment of a receiver, custodian
        or similar agent with respect to, or the taking by any such
        person of possession of, any property of the Employee; or

                  (d)  the issuance of any writ of attachment, by trustee
        process or otherwise, or any restraining order or injunction not
        removed, repealed or dismissed within thirty (30) days of
        issuance, against or affecting the person or property of the
        Employee or any liability or obligation of the Employee to the
        Company.

             In case any payment herein provided for shall not be paid
        when due, the Employee further promises to pay all costs of
        collection, including all reasonable attorneys' fees.

             No delay or omission on the part of the Company in
        exercising any right hereunder shall operate as a waiver of such
        right or of any other right of the Company, nor shall any delay,
        omission or waiver on any one occasion be deemed a bar to or
        waiver of the same or any other right on any future occasion.
        The Employee hereby waives presentment, demand, notice of
        prepayment, protest and all other demands and notices in
        connection with the delivery, acceptance, performance, default or
        enforcement of this Note.  The undersigned hereby assents to any
        indulgence and any extension of time for payment of any
        indebtedness evidenced hereby granted or permitted by the
        Company.  

             This Note has been made pursuant to the Company's Stock
        Holding Assistance Plan and shall be governed by and construed in
        accordance with, such Plan and the laws of the Commonwealth of
        Massachusetts  and shall have the effect of a sealed instrument.


                                      _______________________________

                                      Employee Name: _________________


        ________________________
        Witness



                                                                    Exhibit 11


                            THERMO CARDIOSYSTEMS INC.

                        Computation of Earnings per Share


                                            1996          1995          1994
                                     -----------   -----------   -----------
   Computation of Primary Earnings
    per Share:

   Net Income (a)                    $ 5,358,000   $ 6,925,000   $ 1,899,000
                                     -----------   -----------   -----------

   Shares:
    Weighted average shares
     outstanding                      36,568,711    35,002,530    34,173,986

    Add: Shares issuable from
         assumed conversion of
         subordinated convertible
         debentures                            -     1,757,059     2,276,908

         Shares issuable from
         assumed exercise of
         options and warrants (as
         determined by the
         application of the
         treasury stock method)                -       513,833       479,360
                                     -----------   -----------   -----------
    Weighted average shares
     outstanding, as adjusted (b)     36,568,711    37,273,422    36,930,254
                                     -----------   -----------   -----------
   Primary Earnings per
    Share (a) / (b)                  $       .15   $       .19   $       .05
                                     ===========   ===========   ===========


                                                                   Exhibit 13






















                            THERMO CARDIOSYSTEMS INC.

                        Consolidated Financial Statements

                                      1996
PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                        Consolidated Statement of Income

    (In thousands except per share amounts)       1996       1995       1994
    ------------------------------------------------------------------------
    Revenues (Note 11)                         $29,970    $20,593   $10,409
                                               -------    -------   -------

    Costs and Operating Expenses:
      Cost of revenues                          11,891      8,810     5,127
      Selling, general, and administrative
        expenses (Note 7)                        6,697      4,146     2,789
      Research and development expenses          3,839      3,324     3,437
      Write-off of acquired technology (Note 3)  4,909          -         -
                                               -------    -------   -------
                                                27,336     16,280    11,353
                                               -------    -------   -------

    Operating Income (Loss)                      2,634      4,313      (944)

    Interest Income                              5,297      5,117     4,147
    Interest Expense (Note 6)                      (80)      (274)     (375)
    Gain on Sale of Investments, Net (Note 2)      919        421        97
                                               -------    -------   -------
    Income Before Provision for Income Taxes     8,770      9,577     2,925
    Provision for Income Taxes (Note 5)          3,412      2,652     1,026
                                               -------    -------   -------
    Net Income                                 $ 5,358    $ 6,925   $ 1,899
                                               =======    =======   =======
    Earnings per Share                         $   .15    $   .19   $   .05
                                               =======    =======   =======
    Weighted Average Shares                     36,569     37,273    36,930
                                               =======    =======   =======


    The accompanying notes are an integral part of these consolidated
    financial statements.



                                        2PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                           Consolidated Balance Sheet

    (In thousands)                                          1996        1995
    ------------------------------------------------------------------------
    Assets
    Current Assets:
      Cash and cash equivalents                        $  1,030     $  4,398
      Short-term available-for-sale investments,
        at quoted market value (amortized cost
        of $46,511 and $45,392; Note 2)                  46,455       46,123
      Accounts receivable, less allowances
        of $474 and $309                                  9,443        5,013
      Inventories                                        10,244        6,149
      Prepaid and refundable income taxes (Note 5)        2,330        1,905
                                                       --------     --------
                                                         69,502       63,588
                                                       --------     --------
    Machinery, Equipment, and Leasehold
      Improvements, at Cost                               3,762        2,819
        Less: Accumulated depreciation and
              amortization                                2,082        1,435
                                                       --------     --------
                                                          1,680        1,384
                                                       --------     --------
    Long-term Available-for-sale Investments,
      at Quoted Market Value (amortized cost
      of $33,929 and $39,795; Note 2)                    33,920       39,953
                                                       --------     --------
    Prepaid Income Taxes (Note 5)                         1,746          783
                                                       --------     --------
    Other Assets                                            273          478
                                                       --------     --------
                                                       $107,121     $106,186
                                                       ========     ========








                                        3PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                     Consolidated Balance Sheet (continued)

    (In thousands except share amounts)                     1996        1995
    ------------------------------------------------------------------------
    Liabilities and Shareholders' Investment
    Current Liabilities:
      Current maturity of subordinated convertible
        obligations (Note 6)                           $  3,755    $      -
      Accounts payable                                    1,847        1,670
      Accrued payroll and employee benefits                 712          864
      Other accrued expenses                                833          374
      Due to parent company and Thermo Electron
        Corporation                                          67          297
                                                       --------     --------
                                                          7,214        3,205
                                                       --------     --------
    Subordinated Convertible Obligations (Note 6)             -       11,642
                                                       --------     --------

    Commitments and Contingency (Notes 7 and 8)

    Shareholders' Investment (Notes 4 and 9):
      Common stock, $.10 par value, 100,000,000
        shares authorized; 36,872,257 and 24,126,947
        shares issued                                     3,687        2,413
      Capital in excess of par value                     91,566       82,344
      Retained earnings                                  13,549        8,191
      Treasury stock at cost, 235,509 and 18,097
        shares                                           (8,854)      (2,186)
      Net unrealized gain (loss) on available-
        for-sale investments (Note 2)                       (41)         577
                                                       --------     --------
                                                         99,907       91,339
                                                       --------     --------
                                                       $107,121     $106,186
                                                       ========     ========


    The accompanying notes are an integral part of these consolidated
    financial statements.


                                        4PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                      Consolidated Statement of Cash Flows

    (In thousands)                                1996       1995       1994
    ------------------------------------------------------------------------
    Operating Activities:
      Net income                             $  5,358   $  6,925    $  1,899
      Adjustments to reconcile net income to
        net cash provided by operating
        activities:
          Write-off of acquired technology
            (Note 3)                            4,909          -           -
          Depreciation and amortization           875        925         620
          Provision for losses on accounts
            receivable                            165        120         170
          Gain on sale of investments, net
            (Note 2)                             (919)      (421)        (97)
          Deferred income tax benefit          (1,929)    (1,437)        (81)
          Changes in current accounts,
            excluding the effects of
            acquisition:
              Accounts receivable              (4,582)      (877)     (3,169)
              Inventories                      (4,036)    (2,142)     (1,007)
              Refundable income taxes             873       (780)        102
              Accounts payable                    177        870         524
              Other current liabilities         2,214      1,568       1,535
                                             --------   --------    --------
    Net cash provided by operating
      activities                                3,105      4,751         496
                                             --------   --------    --------

    Investing Activities:
      Acquisition (Note 3)                     (5,013)         -           -
      Proceeds from sale and maturities of
        available-for-sale investments         89,615     84,782      32,121
      Purchases of available-for-sale
        investments                           (83,947)   (92,707)    (54,988)
      Purchases of machinery, equipment, and
        leasehold improvements                   (921)    (1,063)       (446)
      Increase in other assets                      -       (190)       (100)
                                             --------   ---------   --------
    Net cash used in investing activities        (266)    (9,178)    (23,413)
                                             --------   ---------   --------

    Financing Activities:
      Purchase of Company common stock         (5,665)         -           -
      Net proceeds from issuance of Company
        common stock                              741        947         593
      Payment of withholding taxes related
        to stock option exercises              (1,283)    (1,500)     (1,158)
      Net proceeds from issuance of
        subordinated convertible obligations
        (Note 6)                                    -          -      31,968
                                             --------   --------    --------
    Net cash provided by (used in)
      financing activities                   $ (6,207)  $   (553)   $ 31,403
                                             --------   --------    --------

                                        5PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                Consolidated Statement of Cash Flows (continued)

    (In thousands)                               1996       1995        1994
    ------------------------------------------------------------------------
    Increase (Decrease) in Cash and Cash
      Equivalents                            $ (3,368)  $ (4,980)   $  8,486
    Cash and Cash Equivalents at Beginning
      of Year                                   4,398      9,378         892
                                             --------   --------    --------
    Cash and Cash Equivalents at End of Year $  1,030   $  4,398    $  9,378
                                             ========   ========    ========
    Cash Paid For:
      Interest                               $      -   $     29    $     36
      Income taxes                           $  2,260   $  3,191    $    130
    Noncash Activities (Note 3):
      Fair value of assets of acquired
        company                              $  5,068   $      -    $      -
      Cash paid for acquired company           (5,013)         -           -
                                             --------   --------    --------
        Liabilities assumed of acquired
          company                            $     55   $      -    $      -
                                             ========   ========    ========

      Conversions of subordinated
        obligations (Note 6)                 $  7,887   $ 21,808    $    150
                                             ========   ========    ========


    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        6PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

               Consolidated Statement of Shareholders' Investment

    (In thousands)                               1996       1995       1994
    -----------------------------------------------------------------------
    Common Stock, $.10 Par Value
      Balance at beginning of year           $ 2,413    $ 2,288     $ 2,262
      Issuance of stock under employees'
        and directors' stock plans                 9         22          24
      Conversions of subordinated
        convertible obligations (Note 6)          54        103           2
      Effect of three-for-two stock split      1,211          -           -
                                             -------    -------     -------
        Balance at end of year                 3,687      2,413       2,288
                                             -------    -------     -------

    Capital in Excess of Par Value
      Balance at beginning of year            82,344     57,081      56,355
      Issuance of stock under employees'
        and directors' stock plans               452        522         578
      Tax benefit related to employees'
        and directors' stock plans             2,190      3,335           -
      Conversions of subordinated
        convertible obligations (Note 6)       7,791     21,406         148
      Effect of three-for-two stock split     (1,211)         -           -
                                             -------    -------     -------
        Balance at end of year                91,566     82,344      57,081
                                             -------    -------     -------

    Retained Earnings
      Balance at beginning of year             8,191      1,266        (633)
      Net income                               5,358      6,925       1,899
                                             -------    -------     -------
        Balance at end of year                13,549      8,191       1,266
                                             -------    -------     -------

    Treasury Stock
      Balance at beginning of year            (2,186)    (1,089)         (6)
      Activity under employees'
        and directors' stock plans            (1,003)    (1,097)     (1,083)
      Purchases of Company common stock       (5,665)         -           -
                                             -------    -------     -------
      Balance at end of year                  (8,854)    (2,186)     (1,089)
                                             -------    -------     -------
  Net Unrealized Gain (Loss) on Available-
      for-sale Investments
      Balance at beginning of year               577     (1,189)          -
      Effect of change in accounting 
        principle (Note 2)                         -           -      1,038
      Change in net unrealized gain (loss)
        on available-for-sale investments
        (Note 2)                                (618)     1,766      (2,227)
                                             -------    -------     -------
      Balance at end of year                     (41)       577      (1,189)
                                             -------    -------     -------
    Total Shareholders' Investment           $99,907    $91,339     $58,357
                                             =======    =======     =======
    The accompanying notes are an integral part of these consolidated
    financial statements.
                                        7PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies

    Nature of Operations
        Thermo Cardiosystems Inc. (the Company) is a leader in the research,
    development, and manufacture of implantable left ventricular-assist
    systems (LVAS). Its HeartMate(R) devices 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. 

    Relationship with Thermedics Inc. and Thermo Electron Corporation
        The Company was incorporated in 1988 as a wholly owned subsidiary of
    Thermedics Inc. (Thermedics). Prior to that time, the business was
    conducted as a division of Thermedics. As of December 28, 1996,
    Thermedics owned 19,757,612 shares of the Company's common stock,
    representing 54% of such stock outstanding. Thermedics is a 55%-owned
    subsidiary of Thermo Electron Corporation (Thermo Electron). As of
    December 28, 1996, Thermo Electron owned 46,278 shares of the Company's
    common stock, representing .13% of such stock outstanding.

    Principles of Consolidation
        The accompanying financial statements include the accounts of the
    Company and its wholly owned subsidiary. All material intercompany
    accounts and transactions have been eliminated.

    Fiscal Year
        The Company has adopted a fiscal year ending the Saturday nearest
    December 31. References to 1996, 1995, and 1994 are for the fiscal years
    ended December 28, 1996, December 30, 1995, and December 31, 1994,
    respectively.

    Cash and Cash Equivalents
        As of December 28, 1996, $1,018,000 of the Company's cash equivalents
    were invested in a repurchase agreement with Thermo Electron. Under this
    agreement, the Company in effect lends excess cash to Thermo Electron,
    which Thermo Electron collateralizes with investments principally
    consisting of U.S. government agency securities, corporate notes,
    commercial paper, money market funds, and other marketable securities, in
    the amount of at least 103% of such obligation. The Company's funds
    subject to the repurchase agreement are readily convertible into cash by
    the Company. The repurchase agreement earns a rate based on the 90-day
    Commercial Paper Composite Rate plus 25 basis points, set at the
    beginning of each quarter. Cash equivalents are carried at cost, which
    approximates market value.

                                        8PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    Inventories
        Inventories are stated at the lower of cost (on a first-in, first-out
    basis) or market value and include materials, labor, and manufacturing
    overhead. The components of inventories are as follows:

    (In thousands)                                           1996      1995
    -----------------------------------------------------------------------
    Raw materials                                         $ 7,349   $ 2,645
    Work in process                                         2,578     3,141
    Finished goods                                            317       363
                                                          -------   -------
                                                          $10,244   $ 6,149
                                                          =======   =======

    Machinery, Equipment, and Leasehold Improvements
        The costs of additions and improvements are capitalized, while
    maintenance and repairs are charged to expense as incurred. The Company
    provides for depreciation and amortization using the straight-line method
    over the estimated useful lives of the property, as follows: machinery
    and equipment, five to eight years, and leasehold improvements, the
    shorter of the term of the lease or the life of the asset.

    Revenue Recognition
        The Company recognizes revenues upon shipment of its products. The
    Company provides a reserve for its estimate of warranty costs at the time
    of shipment.

    Stock-based Compensation Plans
        The Company applies Accounting Principles Board Opinion (APB) No. 25,
    "Accounting for Stock Issued to Employees" and related interpretations in
    accounting for its stock-based compensation plans (Note 4). Accordingly,
    no accounting recognition is given to stock options granted at fair
    market value until they are exercised. Upon exercise, net proceeds,
    including tax benefits realized, are credited to equity.

    Income Taxes
        In accordance with Statement of Financial Accounting Standards (SFAS)
    No. 109, "Accounting for Income Taxes," the Company recognizes deferred
    income taxes based on the expected future tax consequences of differences
    between the financial statement basis and the tax basis of assets and
    liabilities, calculated using enacted tax rates in effect for the year in
    which the differences are expected to be reflected in the tax return.

    Earnings per Share
        Earnings per share have been computed based upon the weighted average
    number of shares outstanding during the year. Weighted average shares in
    1995 and 1994 includes the effect of common stock equivalents, which
    represents the assumed conversion of the Company's noninterest-bearing 

                                        9PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    subordinated convertible obligations and the assumed exercise of stock
    options and warrants that were computed using the treasury stock method.
    Weighted average shares in 1996 does not include the effect of common
    stock equivalents as the effect on earnings per share would be
    immaterial.

    Stock Split
        All share and per share information, except for share information in
    the accompanying 1995 balance sheet, has been restated to reflect a
    three-for-two stock split effected in the form of a 50% stock dividend,
    distributed in May 1996.

    Use of Estimates
        The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amounts of assets and liabilities,
    disclosure of contingent assets and liabilities at the date of the
    financial statements, and the reported amounts of revenues and expenses
    during the reporting period. Actual results could differ from those
    estimates.

    2.  Available-for-sale Investments

        Effective January 2, 1994, the Company adopted SFAS No. 115,
    "Accounting for Certain Investments in Debt and Equity Securities." In
    accordance with SFAS No. 115, the Company's debt and marketable equity
    securities are considered available-for-sale investments in the
    accompanying balance sheet and are carried at market value, with the
    difference between cost and market value, net of related tax effects,
    recorded currently as a component of shareholders' investment titled "Net
    unrealized gain (loss) on available-for-sale investments." Effect of
    change in accounting principle in the accompanying 1994 statement of
    shareholders' investment represents the unrealized gain, net of related
    tax effects, pertaining to available-for-sale investments held by the
    Company on January 2, 1994.

                                       10PAGE
<PAGE>
   Thermo Cardiosystems Inc.                         1996 Financial Statements

                   Notes to Consolidated Financial Statements

   2.  Available-for-sale Investments (continued)

       The aggregate market value, cost basis, and gross unrealized gains and
   losses of short- and long-term available-for-sale investments by major
   security type, as of December 28, 1996, and December 30, 1995, are as
   follows:

                                                            Gross       Gross
                                   Market        Cost  Unrealized  Unrealized
   (In thousands)                   Value       Basis       Gains      Losses
   --------------------------------------------------------------------------
   1996
   Government agency securities  $76,901      $76,917     $     -    $   (16)
   Corporate bonds                 1,014        1,006           8          -
   Other                           2,460        2,517           -        (57)
                                 -------      -------     -------    -------
                                 $80,375      $80,440     $     8    $   (73)
                                 =======      =======     =======    =======

   1995
   Government agency securities  $83,906      $83,035     $   948    $   (77)
   Corporate bonds                 1,028        1,010          18          -
   Other                           1,142        1,142           -          -
                                 -------      -------     -------    -------
                                 $86,076      $85,187     $   966    $   (77)
                                 =======      =======     =======    =======

        Short- and long-term available-for-sale investments in the
   accompanying 1996 balance sheet include $45,459,000 with contractual
   maturities of one year or less, $34,067,000 with contractual maturities of
   more than one year through five years, and $849,000 with contractual
   maturities of more than five years. Actual maturities may differ from
   contractual maturities as a result of the Company's intent to sell these
   securities prior to maturity and as a result of put and call options that
   enable either the Company, the issuer, or both to redeem these securities
   at an earlier date.
        The cost of available-for-sale investments that were sold was based on
   specific identification in determining realized gains recorded in the
   accompanying statement of income. Gain on sale of investments, net,
   resulted from gross realized gains of $1,040,000 and $439,000 and gross
   realized losses of $121,000 and $18,000 in 1996 and 1995, respectively, and
   gross realized gains of $97,000 in 1994, relating to the sale of
   available-for-sale investments.

   3.  Acquisition

       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, specializing in ventricular-assist
   devices and total artificial hearts, for $5,013,000 in cash. Nimbus is
   engaged strictly in research and development activities and, through its

                                       11PAGE
<PAGE>
   Thermo Cardiosystems Inc.                         1996 Financial Statements

                   Notes to Consolidated Financial Statements

   3.  Acquisition (continued)

   acquisition date, had not completed development of any commercial products
   for which it retains ownership rights. Nimbus' assets acquired by the
   Company included certain technology in development. The feasibility of the
   technology in development had not been conclusively established at the
   acquisition date and such technology had no future use other than in
   potential future generations of heart-assist devices or in total artificial
   hearts. In connection with the acquisition of Nimbus, the Company wrote off
   $4,909,000, which represents the portion of the purchase price allocated to
   technology in development based on estimated replacement cost.
       This acquisition has been accounted for using the purchase method of
   accounting and its results of operations have been included in the
   accompanying financial statements from the date of acquisition. Pro forma
   data is not presented since this acquisition was not material to the
   Company's results of operations.

   4.  Employee Benefit Plans

   Stock-based Compensation Plans

   Stock Option Plans
   ------------------
       The Company has stock-based compensation plans for its key employees,
   directors, and others. Two of these plans, adopted in 1988, permit the
   grant of nonqualified and incentive stock options. A third plan, adopted in
   1994, permits the grant of a variety of stock and stock-based awards as
   determined by the human resources committee of the Company's Board of
   Directors (the Board Committee), including restricted stock, stock options,
   stock bonus shares, or performance-based shares. To date, only nonqualified
   stock options have been awarded under this plan. The option recipients and
   the terms of options granted under these plans are determined by the Board
   Committee. Generally, options granted to date are exercisable immediately,
   but are subject to certain transfer restrictions and the right of the
   Company to repurchase shares issued upon exercise of the options at the
   exercise price, upon certain events. The restrictions and repurchase rights
   generally lapse ratably over a five to ten year period, depending on the
   term of the option, which may range from seven to twelve years.
   Nonqualified options may be granted at any price determined by the Board
   Committee, although incentive stock options must be granted at not less
   than the fair market value of the Company's stock on the date of grant. To
   date, all options have been granted at fair market value. The Company also
   has a directors' stock option plan, adopted in 1991, that provides for the
   grant of stock options to outside directors pursuant to a formula approved
   by the Company's shareholders. Options awarded under this plan are
   exercisable six months after the date of grant and expire three or seven
   years after the date of grant. In addition to the Company's stock-based
   compensation plans, certain officers and key employees may also participate
   in the stock-based compensation plans of Thermedics and Thermo Electron.

   Employee Stock Purchase Program
   -------------------------------
       Substantially all of the Company's full-time employees are eligible to
   participate in an employee stock purchase program sponsored by the Company
   and Thermo Electron. Under this program, shares of the Company's and Thermo
                                       12PAGE
<PAGE>
   Thermo Cardiosystems Inc.                         1996 Financial Statements

                   Notes to Consolidated Financial Statements

   4.  Employee Benefit Plans (continued)

   Electron's common stock can be purchased at the end of a 12-month period at
   95% of the fair market value at the beginning of the period, and the shares
   purchased are subject to a six-month resale restriction. Prior to November
   1, 1995, the applicable shares of common stock could be purchased at 85% of
   the fair market value at the beginning of the period, and the shares
   purchased were subject to a one-year resale restriction. Shares are
   purchased through payroll deductions of up to 10% of each participating
   employee's gross wages. During 1996, 1995, and 1994, the Company issued
   3,469 shares, 7,881 shares, and 7,395 shares, respectively, of its common
   stock under this program.

   Pro Forma Stock-based Compensation Expense
       In October 1995, the Financial Accounting Standards Board issued SFAS
   No. 123, "Accounting for Stock-based Compensation," which sets forth a
   fair-value based method of recognizing stock-based compensation expense. As
   permitted by SFAS No. 123, the Company has elected to continue to apply APB
   No. 25 to account for its stock-based compensation plans. Had compensation
   cost for awards in 1996 and 1995 under the Company's stock-based
   compensation plans been determined based on the fair value at the grant
   dates consistent with the method set forth under SFAS No. 123, the effect
   on the Company's net income and earnings per share would have been as
   follows:

   (In thousands except per share amounts)                 1996      1995
   Net income:
     As reported                                         $5,358    $6,925
     Pro forma                                            4,823     6,795
   Earnings per share:
     As reported                                            .15       .19
     Pro forma                                              .13       .18

       Because the method prescribed by SFAS No. 123 has not been applied to
   options granted prior to January 1, 1995, the resulting pro forma
   compensation expense may not be representative of the amount to be expected
   in future years. Compensation expense for options granted is reflected over
   the vesting period; therefore, future pro forma compensation expense may be
   greater as additional options are granted.
       The fair value of each option grant was estimated on the grant date
   using the Black-Scholes option-pricing model with the following
   weighted-average assumptions:

                                                        1996           1995
   ------------------------------------------------------------------------
   Volatility                                           50%            50%
   Risk-free interest rate                             6.2%           6.0%
   Expected life of options                       6.6 years      4.7 years

                                       13PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                   Notes to Consolidated Financial Statements

   4. Employee Benefit Plans (continued)

      The Black-Scholes option-pricing model was developed for use in
   estimating the fair value of traded options which have no vesting
   restrictions and are fully transferable. In addition, option-pricing models
   require the input of highly subjective assumptions including expected stock
   price volatility. Because the Company's employee stock options have
   characteristics significantly different from those of traded options, and
   because changes in the subjective input assumptions can materially affect
   the fair value estimate, in management's opinion, the existing models do
   not necessarily provide a reliable single measure of the fair value of its
   employee stock options.

   Stock Option Activity
      A summary of the Company's stock option activity is as follows:

                              1996              1995               1994
                        ----------------  ----------------  -----------------
                                Weighted          Weighted           Range of
                        Number   Average  Number   Average  Number     Option
   (Shares in               of  Exercise      of  Exercise      of     Prices
   thousands)           Shares     Price  Shares     Price  Shares  per Share
   --------------------------------------------------------------------------
   Options outstanding,                                              $ 1.15-
     beginning of year  1,137    $ 9.84    1,458   $ 6.05    1,730    12.12
                                                                      10.63-
       Granted            189     32.90      121    28.34      144    14.19
                                                                       1.15-
       Exercised         (179)     3.67     (429)    2.13     (385)    5.93
                                                                       1.15-
       Forfeited          (17)    15.55      (13)   11.03      (31)   12.12
                        -----              -----             -----
   Options outstanding,                                              $ 1.15-
     end of year        1,130    $14.59    1,137   $ 9.84    1,458   $14.19
                        =====    ======    =====   ======    =====   ======
                                                                     $ 1.15-
   Options exercisable  1,130    $14.59    1,137   $ 9.84    1,455   $14.19
                        =====    ======    =====   ======    =====   ======
   Options available
     for grant            453                625               733
                        =====              =====             =====
   Weighted average fair
     value per share of
     options granted
     during year                 $18.23            $14.02
                                 ======            ======

                                       14PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   4.  Employee Benefit Plans (continued)

       A summary of the status of the Company's stock options at December
   28, 1996, is as follows:

                                       Options Outstanding and Exercisable
                                       -----------------------------------
                                                                  Weighted
                                        Number  Weighted Average   Average
                                            of         Remaining  Exercise
   Range of Exercise Prices             Shares  Contractual Life     Price
   -----------------------------------------------------------------------
   (Shares in thousands)

   $ 1.15 - $13.10                         822         5.6 years    $ 8.42
     3.11 -  25.06                          23         4.2 years     19.02
    25.07 -  37.01                         224         8.9 years     28.59
    37.02 -  48.97                          61         5.4 years     44.46
                                         -----
   $ 1.15 - $48.97                       1,130         6.2 years    $14.59
                                         =====

   401(k) Savings Plan
       Substantially all of the Company's full-time employees are eligible
   to participate in Thermo Electron's 401(k) savings plan. Contributions to
   the plan are made by both the employee and the Company. Company
   contributions are based upon the level of employee contributions. For
   this plan, the Company contributed and charged to expense $192,000,
   $135,000, and $91,000 in 1996, 1995, and 1994, respectively.

   5.  Income Taxes

       The components of the provision for income taxes are as follows:

   (In thousands)                                1996       1995       1994
   ------------------------------------------------------------------------
   Currently payable:
     Federal                                   $ 5,219   $ 4,024    $ 1,057
     State                                         122        65         50
                                               -------   -------    -------
                                                 5,341     4,089      1,107
                                               -------   -------    -------
   Net deferred (prepaid):
     Federal                                    (2,185)   (1,437)       (81)
     State                                         256         -          -
                                               -------   -------    -------
                                                (1,929)   (1,437)       (81)
                                               -------   -------    -------
                                               $ 3,412   $ 2,652    $ 1,026
                                               =======   =======    =======

       The Company receives a tax deduction upon exercise of nonqualified
   stock options by employees for the difference between the exercise price
   and the market price of the Company's common stock on the date of

                                       15PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   5.  Income Taxes (continued)

   exercise. The provision for income taxes that is currently payable does
   not reflect $2,190,000 and $3,335,000 of such benefits that have been
   allocated to capital in excess of par value in 1996 and 1995,
   respectively.
       The provision for income taxes in the accompanying statement of
   income differs from the provision calculated by applying the statutory
   federal income tax rate of 34% to income before provision for income
   taxes due to the following:

   (In thousands)                                    1996     1995     1994
   ------------------------------------------------------------------------
   Provision for income taxes at statutory rate    $2,982   $3,256   $  994
   Increases (decreases) resulting from:
     State income taxes, net of federal tax
       benefit                                        249       43       32
     Reversal of valuation allowance                    -     (725)       -
     Other                                            181       78        -
                                                   ------   ------   ------
                                                   $3,412   $2,652   $1,026
                                                   ======   ======   ======

       The Company's valuation allowance was reversed in 1995 as a result
   of reduced uncertainty surrounding the realization of future tax
   benefits. The portion of the reduction in the valuation allowance that
   related to stock options was recorded as an increase to capital in excess
   of par value.
       Short- and long-term prepaid income taxes in the accompanying
   balance sheet consist of the following:

   (In thousands)                                   1996      1995
   ---------------------------------------------------------------
   Prepaid income taxes:
     State tax loss and credit carryforwards       $  434   $  868
     Available-for-sale investments                   360       20
     Inventory basis difference                       483      200
     Accrued compensation                             277      220
     Allowance for doubtful accounts                  189      123
     Reserves and accruals                            114       83
     Write-off of acquired technology (Note 3)      1,865        -
     Other, net                                        25      (29)
                                                   ------   ------
                                                   $3,747   $1,485
                                                   ======   ======

   6.  Subordinated Convertible Obligations

       In January 1994, the Company issued and sold at par value $33,000,000
   principal amount of noninterest-bearing subordinated convertible
   debentures due January 1997. The debentures are convertible into shares
   of the Company's common stock at a conversion price of $14.49 per share.

                                       16PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   6.  Subordinated Convertible Obligations (continued)

       During 1996, 1995, and 1994, $7,887,000, $21,808,000, and $150,000,
   respectively, of subordinated convertible debentures were converted into
   544,168 shares, 1,541,976 shares, and 22,783 shares, respectively, of the
   Company's common stock.
       In January 1997, all of the remaining principal amount of the
   debentures was converted into common stock of the Company.
       The Company's convertible obligations are guaranteed on a
   subordinated basis by Thermo Electron. Thermedics has agreed to reimburse
   Thermo Electron in the event Thermo Electron is required to make a
   payment under the guarantee.
       See Note 10 for the fair value information pertaining to the
   Company's subordinated convertible obligations.

   7.  Related Party Transactions

   Corporate Services Agreement
       The Company and Thermo Electron have a corporate services agreement
   under which Thermo Electron's corporate staff provides certain
   administrative services, including certain legal advice and services,
   risk management, certain employee benefit administration, tax advice and
   preparation of tax returns, centralized cash management, and certain
   financial and other services, for which the Company pays Thermo Electron
   annually an amount equal to 1.0% of the Company's revenues. The Company
   paid an annual fee equal to 1.20% and 1.25% of the Company's revenues in
   1995 and 1994, respectively. The annual fee is reviewed and adjusted
   annually by mutual agreement of the parties. The corporate services
   agreement is renewed annually but can be terminated upon 30 days' prior
   notice by the Company or upon the Company's withdrawal from the Thermo
   Electron Corporate Charter (the Thermo Electron Corporate Charter defines
   the relationship among Thermo Electron and its majority-owned
   subsidiaries). In addition, the Company uses data processing services of
   a majority-owned subsidiary of Thermo Electron, and accounting,
   personnel, and administrative services of Thermedics. For these services,
   as well as the administrative services provided by Thermo Electron, the
   Company was charged $618,000, $478,000, and $368,000 in 1996, 1995, and
   1994, respectively. Management believes that the service fees charged by
   Thermo Electron, its majority-owned subsidiary, and Thermedics are
   reasonable and that such fees are representative of the expenses the
   Company would have incurred on a stand-alone basis. For additional items
   such as employee benefit plans, insurance coverage, and other
   identifiable costs, Thermo Electron charges the Company based upon costs
   attributable to the Company.

   Operating Leases
       The Company subleases office and research facilities from Thermedics
   and is charged for actual square footage occupied at approximately the
   same rent paid per square foot by Thermedics under its prime lease. This
   sublease expires in February 1999. The accompanying statement of income
   includes expenses from the sublease of $116,000, $134,000, and $140,000
   in 1996, 1995, and 1994, respectively. Currently, the cost of the area
   occupied by the Company is $116,000 per year.

                                       17PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   7.  Related Party Transactions (continued)

        Subsequent to year-end 1996, the Company subleased office and
   research facilities from Thermedics Detection Inc. (Thermedics
   Detection), a majority-owned subsidiary of Thermedics, under a two-year
   sublease agreement. The cost of the area occupied by the Company will be
   $40,000 in 1997 and $44,000 in 1998.

   Repurchase Agreement
       The Company invests excess cash in a repurchase agreement with Thermo
   Electron as discussed in Note 1.

   8.  Commitment and Contingency

   Operating Lease
       In addition to the operating leases described in Note 7, the Company
   leases office and research facilities under an operating lease agreement
   expiring in 2000. Future minimum payments due under this lease at
   December 28, 1996, are $105,000 in 1997; $112,000 in 1998 and 1999; and
   $107,000 in 2000. Total future minimum lease payments are $436,000.

   Contingency
       The Company has received correspondence alleging that the textured
   surface of the LVAS housing infringed the intellectual property rights of
   another party. In general, an owner of intellectual property can prevent
   others from using such property without a license and is entitled to
   damages for unauthorized past usage. The Company has investigated the
   bases of the allegation and, based on the opinion of its counsel,
   believes that if the Company were sued on these bases, it would have
   meritorious defenses.

   9.  Stock Purchase Warrant and Common Stock

        In May 1993, in connection with an agreement to develop a material
   to be used in the Company's LVAS, the Company granted to a third party
   the right to purchase from the Company 60,000 shares of the Company's
   common stock at a price of $5.83 per share, which was the fair market
   value of the Company's common stock on the date of grant. This warrant is
   exercisable immediately and expires ten years after the date of grant.
        At December 28, 1996, the Company had reserved 2,161,838 unissued
   shares of its common stock for possible issuance under stock-based
   compensation plans, possible conversion of its outstanding subordinated
   convertible obligations, and possible issuance under the stock purchase
   warrant.

   10.  Fair Value of Financial Instruments 

        The Company's financial instruments consist mainly of cash and cash
   equivalents, available-for-sale investments, accounts receivable,
   accounts payable, due to parent company and Thermo Electron Corporation,
   and current and long-term subordinated convertible obligations. The
   carrying amounts of these financial instruments, with the exception of
   available-for-sale investments and current and long-term subordinated

                                       18PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   10.  Fair Value of Financial Instruments (continued)

   convertible obligations, approximates fair value due to their short-term
   nature.
        Available-for-sale investments are carried at fair value in the
   accompanying balance sheet. The fair values were determined based on
   quoted market prices. See Note 2 for fair value information pertaining to
   these financial instruments.
        The fair value of the Company's subordinated convertible obligations
   was determined based on quoted market prices. The carrying amount and
   fair value of the Company's subordinated convertible obligations are as
   follows:
                                      1996                    1995
                              --------------------    --------------------
                              Carrying        Fair    Carrying        Fair
   (In thousands)               Amount       Value      Amount       Value
   -----------------------------------------------------------------------
   Subordinated convertible
     obligations (1)           $ 3,755     $ 7,435     $11,642     $41,489

   (1)  The fair value of subordinated convertible obligations at December
        28, 1996, and December 30, 1995, exceeds the carrying amount
        primarily due to the market price of the Company's common stock
        exceeding the conversion price of the subordinated convertible
        obligations.

   11.  Significant Customers, Export Sales, and Concentrations of Risk

        No customer accounted for 10% or more of the Company's total
   revenues in 1996 and 1995. Revenues from AMETEC (a licensed distributor
   of the Company's LVAS in Germany) accounted for 10% of the Company's
   total revenues in 1994.
        In 1996 and 1995, export revenues were $4,622,000 and $2,353,000,
   respectively. In 1994, export revenues to Germany, other European
   countries, and other countries were $1,032,000, $1,278,000, and $817,000,
   respectively.
        Certain raw materials used in the manufacture of the Company's LVAS
   are available from only one or two suppliers. The Company is making
   efforts to minimize the risks associated with sole sources and ensure
   long-term availability, including qualifying alternative materials and
   components or developing alternative sources for materials or components
   supplied by a single source. Although the Company believes that it has
   adequate supplies of materials and components to meet demand for the LVAS
   for the foreseeable future, no assurance can be given that the Company
   will not experience shortages of certain materials or components in the
   future that could delay shipments of the LVAS.

                                       19PAGE
<PAGE>
    Thermo Cardiosystems Inc.                      1996 Financial Statements

                   Notes to Consolidated Financial Statements

   12.  Unaudited Quarterly Information

   (In thousands except per share amounts)

   1996                            First    Second     Third  Fourth(a)
   --------------------------------------------------------------------
   Revenues                        $6,693    $7,429    $7,594    $8,254
   Gross profit                     4,274     5,033     5,004     3,768
   Net income (loss)                2,411     2,399     2,762    (2,214)
   Earnings (loss) per share          .06       .07       .08      (.06)

   1995                            First    Second     Third    Fourth
   -------------------------------------------------------------------
   Revenues                        $4,392    $5,589    $5,068    $5,544
   Gross profit                     2,464     3,249     2,895     3,175
   Net income                       1,152     1,671     1,891     2,211
   Earnings per share                 .03       .04       .05       .06

   (a) Includes a write-off of $4,909,000 of acquired technology.










                                       20PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                    Report of Independent Public Accountants

    To the Shareholders and Board of Directors of Thermo Cardiosystems Inc.:

        We have audited the accompanying consolidated balance sheet of Thermo
    Cardiosystems Inc. (a Massachusetts corporation and 54%-owned subsidiary
    of Thermedics Inc.) and subsidiary as of December 28, 1996, and December
    30, 1995, and the related consolidated statements of income,
    shareholders' investment, and cash flows for each of the three years in
    the period ended December 28, 1996. These consolidated financial
    statements are the responsibility of the Company's management. Our
    responsibility is to express an opinion on these consolidated financial
    statements based on our audits.
        We conducted our audits in accordance with generally accepted
    auditing standards. Those standards require that we plan and perform the
    audit to obtain reasonable assurance about whether the financial
    statements are free of material misstatement. An audit includes
    examining, on a test basis, evidence supporting the amounts and
    disclosures in the financial statements. An audit also includes assessing
    the accounting principles used and significant estimates made by
    management, as well as evaluating the overall financial statement
    presentation. We believe that our audits provide a reasonable basis for
    our opinion.
        In our opinion, the consolidated financial statements referred to
    above present fairly, in all material respects, the financial position of
    Thermo Cardiosystems Inc. and subsidiary as of December 28, 1996, and
    December 30, 1995, and the results of their operations and their cash
    flows for each of the three years in the period ended December 28, 1996,
    in conformity with generally accepted accounting principles.



                                           Arthur Andersen LLP



    Boston, Massachusetts
    February 6, 1997




                                       21PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Management's
    Discussion and Analysis of Financial Condition and Results of Operations.
    For this purpose, any statements contained herein that are not statements
    of historical fact may be deemed to be forward-looking statements.
    Without limiting the foregoing, the words "believes," "anticipates,"
    "plans," "expects," "seeks," "estimates," and similar expressions are
    intended to identify forward-looking statements. There are a number of
    important factors that could cause the results of the Company to differ
    materially from those indicated by such forward-looking statements,
    including those detailed immediately after this Management's Discussion
    and Analysis of Financial Condition and Results of Operation under the
    caption "Forward-looking Statements."

    Overview

        The Company is a leader in the research, development, and manufacture
    of implantable left ventricular-assist systems (LVAS). Its HeartMate(R)
    devices 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.
        In general, a profit cannot be earned from the sale of an LVAS in the
    United States until approval of the device has been received from the
    U.S. Food and Drug Administration (FDA) for commercial sale. Until such
    approval is obtained, only the direct and indirect costs of the LVAS can
    be recovered, which are included in the Company's revenues. With the
    FDA's approval of the air-driven LVAS, the Company began earning a profit
    on the sale of such systems in the fourth quarter of 1994. In October
    1994, the Company announced a price increase in the U.S. for its
    air-driven LVAS that was phased in during a six-month period and more
    than doubled the average price of the air-driven LVAS.
        The Company derives its revenues from two types of sales:
    implementation programs and subsequent implants. Implementation programs
    consist of initial sales to new clinical centers or foreign distributors,
    as well as sales of a new system, such as the electric LVAS, to an
    existing customer. Revenues recorded from subsequent implants consist of
    sales to an existing customer other than the initial sale of the
    implementation program. In general, the Company receives greater revenues
    from the sale of an implementation program than from a subsequent
    implant.
        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. 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.

                                       22PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Results of Operations

    1996 Compared With 1995
        Revenues in 1996 increased 46% to $29,970,000 from $20,593,000 in
    1995, primarily due to a 61% increase in the number of air-driven and
    electric LVAS units shipped for subsequent implant and a 30% increase in
    the number of LVAS implementation programs sold during 1996. The Company
    expects that shipments of LVAS units will stabilize at current levels
    until the electric system is approved for commercial sale in the U.S. and
    for use outside the hospital. The Company believes that this approval
    could occur during 1997, however, there can be no assurance that the
    Company will receive this approval within the expected time period, or at
    all.
        The gross profit margin increased to 60% in 1996 from 57% in 1995,
    primarily due to an increase in revenues from higher-margin
    implementation programs, an increase in sales volume and, to a lesser
    extent, manufacturing efficiencies. These increases were offset in part
    by costs associated with modifications made to the Company's LVAS. The
    Company will continue to be unable to earn a profit on sales of the
    electric LVAS in the U.S. until FDA approval of that system is obtained.
        Selling, general, and administrative expenses as a percentage of
    revenues increased to 22% in 1996 from 20% in 1995 as a result of higher
    marketing expenses due to an increase in the Company's sales force. This
    increase was offset in part by the effect of lower expenses as a
    percentage of revenues due to an increase in sales volume. 
        Research and development expenses of $3,839,000 in 1996 and
    $3,324,000 in 1995 reflect the Company's continued development of the
    LVAS. The Company does not expect research and development expenses to
    increase materially as a result of its acquisition of Nimbus, as most of
    Nimbus' research and development costs have historically been funded
    through government contracts.
        In connection with the December 1996 acquisition of Nimbus, the
    Company wrote off $4,909,000, which represents the portion of the
    purchase price allocated to technology in development based on estimated
    replacement cost (Note 3).
        Interest income increased to $5,297,000 in 1996 from $5,117,000 in
    1995, primarily as a result of higher invested balances. Interest expense
    decreased to $80,000 in 1996 from $274,000 in 1995, primarily as a result
    of lower amortization of deferred issuance costs associated with the
    Company's noninterest-bearing subordinated convertible debentures due to
    the conversion of $7,887,000 principal amount of these debentures in
    1996.
        The Company recorded a gain on sale of investments, net, of $919,000
    in 1996, compared with $421,000 in 1995 (Note 2).
        The effective tax rates were 39% and 28% in 1996 and 1995,
    respectively. The effective tax rate in 1996 exceeded the statutory
    federal income tax rate primarily due to the impact of state income
    taxes. The effective tax rate in 1995 was below the statutory federal
    income tax rate due to the reversal of a tax valuation allowance that was
    no longer required.
                                       23PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    1995 Compared With 1994
        Revenues almost doubled in 1995 to $20,593,000 from $10,409,000 in
    1994. Revenues in 1995 increased approximately 47% as a result of the
    price increase that was phased in during the fourth quarter of 1994 and
    the first two quarters of 1995. Revenues also increased due to a 43%
    increase in the number of air-driven and electric LVAS units shipped
    during 1995 compared with 1994. The number of implementation programs
    sold in 1995 were comparable to those sold in 1994.
        The gross profit margin increased to 57% in 1995 from 51% in 1994,
    primarily due to the price increase and, to a lesser extent, the increase
    in sales volume and improvements in manufacturing efficiencies.
        The Company recorded operating income of $4,313,000 in 1995, compared
    with an operating loss of $944,000 in 1994. This improvement resulted
    primarily from an increased gross profit margin on higher revenues,
    partially offset by increased expenses to market and distribute the
    Company's LVAS.
        Interest income increased to $5,117,000 in 1995 from $4,147,000 in
    1994, principally due to higher prevailing interest rates in 1995
    compared with 1994. Interest expense decreased to $274,000 in 1995 from
    $375,000 in 1994, primarily as a result of lower amortization of deferred
    issuance costs associated with the Company's noninterest-bearing
    subordinated convertible debentures due to the conversion of $21,358,000
    principal amount of these debentures in 1995.
        The effective tax rate decreased to 28% in 1995 from 35% in 1994,
    primarily due to the reversal of a tax valuation allowance that was no
    longer required.

    Liquidity and Capital Resources

        Working capital was $62,288,000 at December 28, 1996, compared with
    $60,383,000 at December 30, 1995. Cash, cash equivalents, and short- and
    long-term available-for-sale investments were $81,405,000 at December 28,
    1996, compared with $90,474,000 at December 30, 1995. During 1996,
    $3,105,000 of cash was provided by operating activities. Cash provided by
    the Company's operating results was offset in part by $4,582,000 and
    $4,036,000 of cash used to fund increases in accounts receivable and
    inventories, respectively. These increases were primarily due to a 46%
    increase in sales volume and corresponding increases in production
    levels.
        During 1996, the Company's primary investing activities, excluding
    purchases, sales, and maturities of available-for-sale investments,
    included an acquisition and capital expenditures. In December 1996, the
    Company acquired substantially all of the assets, subject to certain
    liabilities, of Nimbus for $5,013,000 in cash (Note 3). The Company
    expended $921,000 on purchases of machinery, equipment, and leasehold
    improvements during 1996.
        During 1996, the Company expended $6,207,000 for financing
    activities. The Company's Board of Directors has authorized the
    repurchase, through August 12, 1997, of up to $10.0 million of its own
    securities. Any such purchases would be funded from working capital.
    Through December 28, 1996, the Company had expended $5,665,000 under this
    authorization.
                                       24PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Liquidity and Capital Resources (continued)

        In 1997, the Company expects to make capital expenditures of
    approximately $1,600,000, principally for manufacturing and tooling
    equipment and leasehold improvements for the continued development and
    production of the Company's LVAS. The Company believes it has adequate
    resources to meet its financial needs for the foreseeable future.
















                                       25PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                           Forward-looking Statements

        In connection with the "safe harbor" provisions of the Private
    Securities Litigation Reform Act of 1995, the Company wishes to caution
    readers that the following important factors, among others, in some cases
    have affected, and in the future could affect, the Company's actual
    results and could cause its actual results in 1997 and beyond to differ
    materially from those expressed in any forward-looking statements made
    by, or on behalf of, the Company.
        Uncertainty of Regulatory Approval for Biomedical Devices. The
    Company's left ventricular-assist systems (LVAS) are subject to approval
    by the U.S. Food and Drug Administration (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. Even after FDA approval has been
    obtained, such approval can be suspended or revoked if the FDA does not
    continue to be satisfied with the safety and efficacy of a product.
    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 received FDA approval for the commercial
    sale of its pneumatic LVAS. In April 1994, the Company received the CE
    Mark for commercial sale of the pneumatic LVAS in all European Union
    countries. The Company has developed the HeartPak(TM), a lightweight,
    portable console that can be carried over the shoulder and can be used as
    an alternative to the larger external console approved for use with the
    pneumatic LVAS. The HeartPak received the CE Mark in February 1995 and
    the HeartPak is currently in Phase I clinical trials in the U.S. The
    Company's electric LVAS is currently in use in clinical trials in the
    U.S. These trials are testing the safety and efficacy of the device as
    both a bridge to transplant and as an alternative to medical therapy. The
    electric LVAS received the CE Mark in August 1995.
        No assurance can be given that the Company will file a supplement to
    its premarket approval (PMA) application with the FDA with respect to the
    electric LVAS on a timely basis, or at all, or that the PMA supplement,
    if filed, will ultimately be approved by the FDA. In addition, any design
    changes to the Company's LVAS, including use of the portable console for
    the pneumatic LVAS, must be approved pursuant to a supplement to an
    approved PMA application. Failure of the Company to obtain FDA approval
    for the commercial sale of the electric LVAS, either as a bridge to
    transplant or as an alternative to medical therapy, would have a material
    adverse effect on the Company's long-term growth prospects. In addition,
    failure of the Company to obtain approval for the HeartPak portable
    console would require patients supported by the pneumatic LVAS to remain
    hospitalized. This could materially decrease the market for the pneumatic
    LVAS.
        Uncertainty of Patient Reimbursement. The cost of implanting a
    cardiac support system is substantial. Without the financial support of
    the government or third-party insurers, the market for the Company's
    devices will be limited. Medicare and Medicaid limit the reimbursement
    that U.S. hospitals receive for treating certain medical conditions by
    setting maximum fees that can be charged to their patients. Under these
    systems, hospitals are paid a fixed amount for treating each patient with
    a particular diagnosis. Private insurers also have initiated

                                       26PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                           Forward-looking Statements

    reimbursement systems designed to slow the escalation of healthcare
    costs. In addition, the federal government is considering, and certain
    state governments are considering or have adopted, new healthcare
    policies intended to curb rising costs. Such policies include rationing
    of government-funded reimbursement for healthcare 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.
        In November 1995, the U.S. Health Care Finance Administration (HCFA)
    issued a decision that extends Medicare coverage to the Company's
    HeartMate pneumatic LVAS. Several major nongovernment insurers have
    already agreed to offer coverage for the pneumatic LVAS. Even though
    reimbursement has been established by HCFA and by certain nongovernment
    insurers, the amount of available reimbursement may change, and
    reimbursement may be denied by an insurer 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. No assurance can be given that additional
    third-party reimbursement for the pneumatic LVAS will be granted within a
    reasonable period of time, or at all. The unavailability of third-party
    reimbursement for procedures involving the Company's systems 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 influence 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 are 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 have 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 for obtaining 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.
        Technological Change and Competition. The Company is aware of only
    one other company performing clinical trials of intermediate or long-term
    LVAS support in humans. However, there are many organizations engaged in
    the development of various types of cardiac support systems, including a
    total artificial heart. As other organizations realize the commercial
    potential for LVAS, the Company believes that competition will intensify.
    Although the length of the regulatory approval process for medical
    devices such as LVAS is a barrier to entry into this market, the
    Company's products could be rendered obsolete or uneconomical by
    technological advances by one or more of the Company's present

                                       27PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                           Forward-looking Statements

    competitors or by future entrants into the industry. Many manufacturers
    of medical devices have greater research and development, manufacturing,
    and marketing resources than those of the Company.
        Availability of Components and Raw Materials. The Company relies on a
    number of custom-designed components and materials supplied by other
    companies to manufacture its LVAS. The Company is making efforts to
    minimize the risks associated with sole sources and ensure long-term
    availability, including qualifying alternative materials and components
    or developing alternative sources for materials and components supplied
    by a single source. Although the Company believes that it has adequate
    supplies of materials and components to meet demand for its products for
    the foreseeable future, no assurance can be given that the Company will
    not experience shortages of certain materials or components in the future
    that could delay shipments of its products. The cost to the Company to
    evaluate and test alternative materials and components 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 alternative material or
    component to the original material or component, and the amount of
    third-party testing that may have already been completed on alternative
    materials or components. There can be no assurance that the substitution
    of alternative materials or components would not cause delays in the
    Company's LVAS development programs or adversely affect the Company's
    ability to manufacture and ship LVAS to meet demand.
        Intellectual Property Rights. The Company relies principally upon
    trade secret protection and, to a lesser extent, patents to protect its
    proprietary rights. No assurance can be given that the Company will be
    able to effectively protect its trade secrets, or that competitors will
    not independently develop equivalent technology or design around the
    Company's patents. The Company's competitive position could be adversely
    affected if the Company is unable to protect adequately its proprietary
    rights. In addition, there can be no assurance that third parties will
    not assert claims against the Company that the Company infringes the
    intellectual property rights of such parties. The Company could incur
    substantial costs and diversion of management resources with respect to
    the defense of any such claims, which could have a material adverse
    effect on the Company's business, financial condition, and results of
    operations. Furthermore, parties making such claims could secure a
    judgment awarding substantial damages, as well as injunctive or other
    equitable relief, which could effectively block the Company's ability to
    make, use, sell, distribute or market its products and services in the
    U.S. or abroad. In the event that a claim relating to intellectual
    property is asserted against the Company, the Company may seek licenses
    to such intellectual property. There can be no assurance, however, that
    such licenses could be obtained on commercially reasonable terms, if at
    all. The failure to obtain the necessary licenses or other rights could
    preclude the sale, manufacture, or distribution of the Company's products
    and, therefore, could have a material adverse effect on the Company's
    business, financial condition, and results of operations. The Company has
    received correspondence from a third party alleging that the textured
    surface of the LVAS infringes certain patent rights of such third party.

                                       28PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                           Forward-looking Statements

    The Company believes that it has meritorious defenses to the claims of
    the third party. However, no assurance can be given that the Company
    would be successful if litigation was commenced or that others will not
    claim that the Company infringes their intellectual property rights.
        Limited Manufacturing and Marketing Experience. Prior to FDA approval
    of commercial sale of the pneumatic LVAS, the Company was engaged only in
    the research and development of its LVAS. Since that time, the Company
    has been building its manufacturing, marketing, and sales capabilities.
    Although the Company has not experienced difficulties in manufacturing
    its LVAS at volumes, cost, and quality levels sufficient to satisfy the
    increased demand resulting from commercial approval, no assurance can be
    given that the Company will not encounter difficulties as sales volumes
    increase or new products and/or components are approved for commercial
    sale. The Company does not have experience in the large-scale
    commercialization of medical devices. Although the Company has added
    sales and marketing staff and is expanding its distribution capabilities
    worldwide, no assurance can be given that the Company will be able to
    market and sell its products successfully in high volumes.
        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 continue to be
    able to obtain such coverage at economically feasible rates, if at all,
    or that such coverage will be adequate in terms and scope to completely
    protect the Company in the event of a successful product liability claim.








                                       29PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements

                         Selected Financial Information

    (In thousands except
    per share amounts)      1996(a)   1995(b)  1994(c)      1993      1992
    ----------------------------------------------------------------------
    Statement of Income Data:
    Revenues              $ 29,970  $ 20,593  $10,409    $ 3,524   $ 2,441
    Net income               5,358     6,925    1,899        404        18
    Earnings per share         .15       .19      .05        .01         -

    Balance Sheet Data:
    Working capital       $ 62,288  $ 60,383  $44,121    $16,059   $15,118
    Total assets           107,121   106,186   94,864     59,838    59,072
    Long-term obligations        -    11,642   33,450        600     2,520
    Common stock subject
      to redemption              -         -        -          -     5,468
    Shareholders'
      investment            99,907    91,339   58,357     57,978    50,038

    (a) Reflects conversion of $7,887,000 principal amount of
        noninterest-bearing subordinated convertible obligations and the
        December 1996 acquisition of Nimbus Medical, Inc.
    (b) Reflects conversion of $21,358,000 principal amount of noninterest-
        bearing subordinated convertible obligations.
    (c) Reflects the January 1994 issuance of $33,000,000 principal amount
        of noninterest-bearing subordinated convertible obligations due
        1997.








                                       30PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements


    Common Stock Market Information
        The following table shows the market range for the Company's common
    stock based on reported sales prices on the American Stock Exchange
    (symbol TCA) for 1996 and 1995. Prices have been restated to reflect a
    three-for-two stock split, effected in the form of a 50% stock dividend,
    distributed in May 1996.

                                    1996               1995
                             -----------------   -----------------
                   Quarter      High       Low      High       Low
                   -----------------------------------------------
                  First      $55 1/3   $39 1/3   $19 5/6  $10 5/12
                  Second      55 3/8    39 7/12   26 1/12  18 5/6
                  Third       44 5/8    29 1/2    33 1/6   24 1/6
                  Fourth      38 1/4    23 3/8    51 1/2   28 5/12

        As of January 24, 1997, the Company had 465 holders of record of its
    common stock. This does not include holdings in street or nominee names.
    The closing market price on the American Stock Exchange for the Company's
    common stock on January 24, 1997, was $27 per share.

    Shareholder Services
        Shareholders of Thermo Cardiosystems Inc. who desire information
    about the Company are invited to contact John N. Hatsopoulos, Chief
    Financial Officer, Thermo Cardiosystems Inc., 81 Wyman Street, P.O. Box
    9046, Waltham, Massachusetts 02254-9046, (617) 622-1111. A mailing list
    is maintained to enable shareholders whose stock is held in street name,
    and other interested individuals, to receive quarterly reports, annual
    reports, and press releases as quickly as possible. Beginning in 1997,
    quarterly distribution will be limited to the second quarter report only.
    All quarterly reports and press releases are available through the
    Internet from Thermo Electron's home page on the World Wide Web
    (http://www.thermo.com/subsid/tca.html).

    Stock Transfer Agent
        American Stock Transfer & Trust Company is the stock transfer agent
    and maintains shareholder activity records. The agent will respond to
    questions on issuance of stock certificates, change of ownership, lost
    stock certificates, and change of address. For these and similar matters,
    please direct inquiries to:

        American Stock Transfer & Trust Company
        Shareholder Services Department
        40 Wall Street, 46th Floor
        New York, New York 10005
        (718) 921-8200


                                       31PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1996 Financial Statements


    Dividend Policy
        Except for a $.01 per share dividend distributed to partially offset
    income tax liability relating to the Company's recapitalization in 1990,
    the Company has never paid any cash dividends because its policy is to
    use earnings to finance expansion and growth. The Company's Board of
    Directors anticipates that for the foreseeable future no cash dividends
    will be paid on the Company's common stock.

    Form 10-K Report
        A copy of the Annual Report on Form 10-K for the fiscal year ended 
    December 28, 1996, as filed with the Securities and Exchange Commission,
    may be obtained without charge by writing to John N. Hatsopoulos, Chief
    Financial Officer, Thermo Cardiosystems Inc., 81 Wyman Street, P.O. Box
    9046, Waltham, Massachusetts 02254-9046.

    Annual Meeting
        The annual meeting of shareholders will be held on Monday, June 2,
    1997, at 1:30 p.m., at the Hyatt Regency Hotel, Hilton Head, South
    Carolina.

                                       32<PAGE>




                                                                  Exhibit 21
                             THERMO CARDIOSYSTEMS INC.

                          Subsidiaries of the Registrant

   As of February 28, 1997, the Registrant owned the following subsidiaries:

                                                       STATE OR
                                                     JURISDICTION    PERCENT
                          NAME                             OF           OF
                                                     INCORPORATION   OWNERSHIP
                                                           
              Nimbus Inc.                             Massachusetts    100 %
                                                           
              TCA Securities Corporation              Massachusetts    100 %
                                                         
    




                                                                    Exhibit 23



                    Consent of Independent Public Accountants
                    -----------------------------------------


         As independent public accountants, we hereby consent to the
    incorporation by reference of our reports dated February 6, 1997,
    included in or incorporated by reference into Thermo Cardiosystems Inc.'s
    Annual Report on Form 10-K for the year ended December 28, 1996, into the
    Company's previously filed Registration Statement No. 33-45283 on Form
    S-8, Registration Statement No. 33-45255 on Form S-8, Registration
    Statement No. 33-52822 on Form S-8, Registration Statement No. 33-75654
    on Form S-3, Registration Statement No. 33-78732 on Form S-8,
    Registration Statement No. 33-78730 on Form S-8, Registration Statement
    No. 33-78734 on Form S-8, Registration Statement No. 33-78736 on Form
    S-8, Registration Statement No. 33-78728 on Form S-8, Registration
    Statement No. 033-65271 on Form S-8, and Registration No. 333-5671 on
    Form S-3.



                                                 Arthur Andersen LLP


    Boston, Massachusetts
    March 14, 1997


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S ANNUAL REPORT FILED ON FORM 10-K FOR THE YEAR ENDED
DECEMBER 28, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                           1,030
<SECURITIES>                                    46,455
<RECEIVABLES>                                    9,917
<ALLOWANCES>                                       474
<INVENTORY>                                     10,244
<CURRENT-ASSETS>                                69,502
<PP&E>                                           3,762
<DEPRECIATION>                                   2,082
<TOTAL-ASSETS>                                 107,121
<CURRENT-LIABILITIES>                            7,214
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                                0
                                          0
<COMMON>                                         3,687
<OTHER-SE>                                      96,220
<TOTAL-LIABILITY-AND-EQUITY>                   107,121
<SALES>                                         29,970
<TOTAL-REVENUES>                                29,970
<CGS>                                           11,891
<TOTAL-COSTS>                                   11,891
<OTHER-EXPENSES>                                 8,748
<LOSS-PROVISION>                                   165
<INTEREST-EXPENSE>                                  80
<INCOME-PRETAX>                                  8,770
<INCOME-TAX>                                     3,412
<INCOME-CONTINUING>                              5,358
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