THERMO CARDIOSYSTEMS INC
10-K, 1998-03-18
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 January 3, 1998

   [   ] 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: (781) 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 30, 1998, was approximately $343,189,000.

   As of January 30, 1998, the Registrant had 35,663,409 shares of Common
   Stock outstanding (39,019,114 pro forma shares).

                       DOCUMENTS INCORPORATED BY REFERENCE

   Portions of the Registrant's Annual Report to Shareholders for the year
   ended January 3, 1998, 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 1, 1998, 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, which require removal of the
    natural heart, the LVAS allows the natural heart to remain in place,
    preserving the heart's biological control mechanisms and reducing
    blood-contacting surfaces that have led to strokes in patients using
    other cardiac devices. The Company has developed two systems for patients
    requiring long-term cardiac support: an implantable pneumatic 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 United States in clinical trials
    for patients awaiting heart transplants. In June 1997, the Company
    submitted a premarket approval (PMA) supplemental application to receive
    FDA approval of the electric LVAS for use as a bridge to transplant. This
    application is currently under review; however, no assurance can be given
    that the FDA will review this application on a timely basis or will grant
    approval once it completes its review. 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. In December 1997, the
    FDA approved the Company's proposal to broaden the entrance criteria and
    increase the number of participating sites under this trial. The electric
    LVAS is being used in Europe as both a bridge to transplant and as an
    alternative to medical therapy.

        The Company's Nimbus Medical Inc. subsidiary has been involved in
    artificial heart technology for more than 20 years and has carried out
    research in two primary fields: ventricular-assist devices and total
    artificial hearts. Nimbus was instrumental in developing the basic
    technology for high-speed rotary blood pumps. Because of their smaller
    size, rotary blood pumps may potentially be used to provide cardiac
    support in small adults and in children.

        On May 2, 1997, the Company acquired International Technidyne
    Corporation from Thermo Electron Corporation in exchange for the right to
    receive 3,355,705 shares of the Company's common stock. International
    Technidyne is a leading manufacturer of near-patient, whole-blood
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    coagulation testing equipment and related disposables and also
    manufacturers premium-quality, single-use skin-incision devices. The
    3,355,705 shares of the Company's common stock issuable in the merger
    will not be issued until the listing of such shares for trading upon the
    American Stock Exchange has been approved by the Company's shareholders.
    Because Thermedics Inc. is the majority shareholder and intends to vote
    its shares in favor of such listing, the approval is assured.

        The Company was incorporated in 1988 as a wholly owned subsidiary of
    Thermedics, a publicly traded subsidiary of Thermo Electron, and is the
    successor in interest to the assets and business of that company relating
    to the research and development of implantable heart-assist systems. This
    business was conducted by Thermedics from its formation in 1983, and
    prior to that time as a division of Thermo Electron beginning in 1966. As
    of January 3, 1998, Thermedics owned 19,757,612 shares of the Company's
    common stock, representing 51% 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, a range of power
    products and instruments to test electronics, security devices, and
    moisture-analysis systems. Thermedics is a 58%-owned subsidiary of Thermo
    Electron. As of January 3, 1998, Thermo Electron owned 3,448,708 shares
    of the Company's common stock, representing 8.8% of such stock
    outstanding, including 3,355,705 shares issuable to Thermo Electron for
    the acquisition of International Technidyne. Thermo Electron may purchase
    shares of the Company's common stock from time to time in the open market
    or in negotiated transactions. During 1997*, Thermo Electron purchased
    50,400 shares of the Company's common stock on the open market for
    $1,360,000. Thermo Electron provides analytical and monitoring
    instruments; biomedical products including heart-assist devices,
    respiratory-care equipment, and mammography systems; paper-recycling and
    papermaking equipment; alternative-energy systems; industrial process
    equipment; and other specialized products. Thermo Electron also provides
    industrial outsourcing, particularly in environmental-liability
    management, laboratory analysis, and metallurgical processing; and
    conducts advanced-technology research and development.

        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. On February 5,
    1998, Thermedics' Board of Directors voted to acquire from Thermo
    Electron the stock of TMO TCA Holdings Inc., which is the beneficial
    owner of 3,355,705 shares of the Company's common stock, in exchange for
    4,880,533 shares of Thermedics common stock. The issuance of Thermedics
    common stock is subject to the approval of Thermedics' shareholders.
    Because Thermo Electron is the majority shareholder and intends to vote 


    * References to 1997, 1996, and 1995 herein are for the fiscal years
      ended January 3, 1998, December 28, 1996, and December 30, 1995,
      respectively.
                                        3PAGE
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    its shares in favor of the transaction, the approval is assured. See
    Notes 4 and 6 to Consolidated Financial Statements in the Company's 1997
    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 heading "Forward-looking
    Statements" in the Registrant's 1997 Annual Report Shareholders, which
    statements are incorporated herein by reference.

    (b) Financial Information About Industry Segments
        ---------------------------------------------

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

    (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 PMA
    application to the FDA. PMA supplements must be submitted and approved
    for each type and application of the Company's LVAS before being sold
    commercially (see "Government Regulation").

    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. 
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        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. 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. The Company's LVAS
    devices are at various stages of regulatory approval.

        Air-driven LVAS. In October 1994, the FDA approved the air-driven
    system as a bridge to transplant for patients awaiting heart
    transplantation. 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. 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. The HeartPak is currently in Phase I clinical
    trials in the U.S. Phase I of the study is evaluating the safety of the
    system in the hospital; Phase II will evaluate the system in the home
    environment.

        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. 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 United States, Europe, and other regions, and is also
    implanted as an alternative to heart transplant in Europe and other
    regions. The electric LVAS may not be sold commercially in the United
    States until it has received approval from the FDA. The electric LVAS is
    currently being used in the United States in clinical trials for patients
    awaiting heart transplants. In June 1997, the Company submitted a PMA
    supplemental application to receive FDA approval of the electric LVAS for
    use as a bridge to transplant. This application is currently under
    review; however, no assurance can be given that the FDA will review this
    application on a timely basis or will grant approval once it completes
    its review.

                                        5PAGE
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        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
    December 1997, the FDA approved the Company's proposal to broaden the
    entrance criteria and increase the number of participating sites under
    this trial. The Company estimates that it will complete this trial in two
    to three years; however, no assurance can be given that the Company will
    complete this study or that it will receive FDA approval during this time
    period, or at all.

    Blood-testing Equipment and Skin-incision Devices

        International Technidyne manufacturers and supplies whole-blood
    coagulation testing equipment and related disposables, as well as
    skin-incision devices.

        Whole-blood coagulation testing equipment. International Technidyne's
    HEMOCHRON(R) and HEMOCHRON(R) Jr. product lines offer whole-blood
    coagulation systems for bedside anticoagulation management, coagulation
    screening, and transfusion management. Each analyzes small blood samples,
    then processes and quickly displays comprehensive patient hemostasis
    information. Blood management of this type is essential as the number of
    invasive medical procedures, such as cardiopulmonary bypass surgery and
    angioplasty, increase. Some HEMOCHRON models are designed for use either
    in a clinical setting or at the patient's bedside, while others are
    designed for testing at any patient location because they are
    lightweight, battery-operated, and portable.

        The ProTime(R) Microcoagulation System is designed to allow long-term
    oral anticoagulant patient self-testing for patients who take the
    blood-thinning drug warfarin (Coumidin). The system consists of a
    hand-held instrument, a five-channel cuvette, and a finger-incision
    device.

        Skin-incision devices. International Technidyne manufactures a family
    of single-use skin-incision devices for drawing blood from adults,
    children, and infants. Each employs International Technidyne's patented
    skin-incision technology to provide a standardized surgical incision, not
    a puncture. International Technidyne's line of Surgicutt(R) products are
    used to perform bleeding-time tests on adults, children, and newborns.
    International Technidyne's Tenderlett(R) finger-incision products for
    blood sampling are available in models suitable for adults, children, and
    infants and toddlers. Tenderfoot(R) is a heel-incision device that is
    designed specifically for toddlers, infants, and premature infants.

    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 
                                        6PAGE
<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/or 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
    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 for a Class III device, 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 Quality System (QS)
    regulations. These regulations require that the Company manufacture its
    systems and maintain its records in accordance with current Good
    Manufacturing Practice (GMP). 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 the QS regulations, 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.
                                        7PAGE
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        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
    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.

        A majority of International Technidyne's products are regulated by
    the FDA as Class II medical devices. International Technidyne is also
    subject to regulatory requirements in foreign countries in which it
    markets its devices. The FDA conducted a routine audit of International
    Technidyne's manufacturing facilities in September 1996, inspecting the
    manufacture of International Technidyne's coagulation timing instruments
    and coagulation timing cuvettes. On November 15, 1996, the FDA informed
    International Technidyne that the areas inspected appeared to be in
    substantial compliance with the applicable requirements of the FDC Act
    and the regulations thereunder.

    Third-party Reimbursement

        The HeartMate air-driven LVAS is the only implantable, ventricular-
    assist system approved for commercial sale, as a bridge to transplant 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. HCFA's coverage policy
    could extend to the electric LVAS once approved, although there can be no
    assurance such coverage will extend to the electric LVAS. In addition,
                                        8PAGE
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    some major nongovernment insurers currently offer coverage for the
    electric LVAS because of its IDE status as a category B device (eligible
    for Medicare coverage and payment).

        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 for the air-driven LVAS, 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 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.

        International Technidyne's ProTime device was cleared for patient
    self-testing by the FDA in 1997 and is currently being evaluated by the
    HCFA to determine whether this device will be eligible for coverage by
    Medicare.

    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
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    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 United States 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
    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.

    Dependency on a Single Customer

        Revenues from one customer accounted for 24%, 23%, and 25% of the
    Company's total revenues in 1997, 1996, and 1995, respectively. The loss
    of this customer would have a material adverse impact on the Company.

    Backlog

        The Company's backlog of firm orders was approximately $2,556,000 and
    $1,947,000 as of January 3, 1998, and December 28, 1996, respectively.
    Certain of these orders are cancellable by the customer upon payment of a
    cancellation charge. The Company believes that approximately 65% of the
    backlog at January 3, 1998, will be shipped or completed during the next
    12 months. The Company does not believe that the size of its backlog is
    necessarily indicative of intermediate or long-term trends in its
    business.

    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
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    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 United States is a significant barrier to entry
    into the United States 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.

        International Technidyne's principal competitor in the market for
    coagulation monitoring instruments such as HEMOCHRON is the HemoTec
    division of Medtronic, which manufactures a whole-blood ACT instrument as
    well as the Hepcon Hemostatic Monitoring System. International Technidyne
    also competes with CDI, which is attempting to compete with HEMOCHRON.
    Boehringer Mannheim Corporation has developed a patient blood coagulation
    self-testing device similar to the ProTime, which is marketed to
    professionals. Boehringer Mannheim has also recently received FDA
    clearance for patient self-testing for this product. International
    Technidyne's coagulation monitoring products compete on the basis of
    reputation, price, and reliability.

        International Technidyne's incision devices compete with products
    offered by a number of companies, including Organon Teknika; Becton,
    Dickinson and Company; and Sherwood Medical Company. International
    Technidyne's incision devices compete primarily on the basis of quality,
    reliability, and reputation.

    Research and Development

        During 1997, 1996, and 1995, the Company expended approximately
    $8,682,000, $7,498,000, and $7,111,000, respectively, on internally
    sponsored research and development programs.

    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.

                                       11PAGE
<PAGE>
    Number of Employees

        As of January 3, 1998, the Company had a total of 420 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 1997 Annual Report to Shareholders, which information is
    incorporated herein by reference.

    (e) Executive Officers of the Registrant
        ------------------------------------

                                           Present Title (Year First Became
        Name                          Age  Executive Officer)
        ----------------------------  ---  ---------------------------------
        Victor L. Poirier              56  President and Chief Executive
                                             Officer (1988)
        John N. Hatsopoulos            63  Chief Financial Officer and 
                                             Senior Vice President (1988)
        Betty A. Silverstein-Russell   48  Senior Vice President (1989)
        Timothy J. Krauskopf           36  Vice President, Regulatory
                                             Affairs (1995)
        Paul F. Kelleher               55  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 owns approximately 66,000 square feet of office,
    manufacturing, and research facilities and leases approximately 24,000
    square feet of office space in Edison, New Jersey. The Company subleases
    approximately 32,200 square feet of space in Thermedics' corporate
    headquarters in Woburn, Massachusetts, pursuant to a sublease expiring in
    1999. The Company also subleases approximately 8,000 square feet of
    office and research facilities in Chelmsford, Massachusetts, from
    Thermedics Detection Inc., a publicly traded, majority-owned subsidiary
    of Thermedics, pursuant to a two-year lease agreement. In addition, the
    Company occupies approximately 11,000 square feet of office and research
                                       12PAGE
<PAGE>
    facilities in Rancho Cordova, California, pursuant to a lease expiring in
    2002. The Company believes that these facilities are in good condition
    and are suitable for its present operations.

    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 1997 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 1997 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 1997 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 January 3,
    1998 and Supplementary Data are included in the Registrant's 1997 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.
                                       13PAGE
<PAGE>
                                    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.








                                       14PAGE
<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.


                                       15PAGE
<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 18, 1998              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 17, 1998.

    Signature                         Title
    ---------                         -----


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

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

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

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

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

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

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

    By: John T. Keiser            Director
        ------------------------
        John T. Keiser

    By: Nicholas T. Zervas        Director
        ------------------------
        Nicholas T. Zervas
                                       16PAGE
<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 12, 1998.
    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 15 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 12, 1998










                                       17PAGE
<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
    ------------------------------------------------------------------------
    Allowance for Doubtful
      Accounts

      Year Ended Jan. 3, 1998         $736       $120        $ (23)    $833

      Year Ended Dec. 28, 1996        $571       $165        $   -     $736

      Year Ended Dec. 30, 1995        $493       $120        $ (42)    $571








                                       18PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
      2           Agreement and Plan of Reorganization among Thermo
                  Cardiosystems Inc., ITC Acquisition Corp., Thermo
                  Electron Corporation, ITC Holdings Inc., and
                  International Technidyne Corporation dated as of
                  May 2, 1997 (filed as Exhibit 2.1 to the
                  Registrant's Quarterly Report on Form 10-Q for the
                  quarter ended March 29, 1997 [File No. 1-10114] and
                  incorporated herein by reference).

      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).

                                       19PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
      4.5         Fiscal Agency Agreement dated as of May 14, 1997,
                  among the Registrant, Thermo Electron Corporation,
                  and Bankers Trust Company as fiscal agent relating
                  to $70 million principal amount of 4 3/4%
                  Convertible Subordinated Debentures due 2004 (filed
                  as Exhibit 4 to the Registrant's Quarterly Report
                  on Form 10-Q for the quarter ended June 28, 1997
                  [File No. 1-10114] 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).

     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).

                                       20PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
     10.7         Amended and Restated Master Repurchase Agreement
                  dated July 2, 1996, between the Registrant and
                  Thermo Electron (filed as Exhibit 10.7 to the
                  Registrant's Annual Report on Form 10-K for the
                  fiscal year ended December 28, 1996 [File No.
                  1-10114] and incorporated herein by reference).

     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).

     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.)

                                       21PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
                  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. The terms of
                  such plans are substantially the same as those of
                  the Registrant's Equity Incentive Plan.

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

      10.24       Amended and Restated Master Guarantee Reimbursement
                  and Loan Agreement dated as of December 18, 1997,
                  between Thermo Electron and the Registrant.

      10.25       Amended and Restated Master Guarantee Reimbursement
                  and Loan Agreement dated as of December 18, 1997,
                  between Thermedics and the Registrant.

      13          Annual Report to Shareholders for the year ended
                  January 3, 1998 (only those portions incorporated
                  herein by reference).

      21          Subsidiaries of the Registrant.

      23          Consent of Arthur Andersen LLP.

      27.1        Financial Data Schedule for the year ended January
                  3, 1998.

      27.2        Financial Data Schedule for the year ended December
                  30, 1995 (restated for the adoption of SFAS No. 128
                  and the acquisition of International Technidyne
                  Corporation).

      27.3        Financial Data Schedule for the quarter ended March
                  30, 1996 (restated for the adoption of SFAS No. 128
                  and the acquisition of International Technidyne
                  Corporation).

      27.4        Financial Data Schedule for the quarter ended June
                  29, 1996 (restated for the adoption of SFAS No. 128
                  and the acquisition of International Technidyne
                  Corporation).

                                       22PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number        Description of Exhibit
    ------------------------------------------------------------------------
      27.5        Financial Data Schedule for the quarter ended
                  September 28, 1996 (restated for the adoption of
                  SFAS No. 128 and the acquisition of International
                  Technidyne Corporation).

      27.6        Financial Data Schedule for the year ended December
                  28, 1996 (restated for the adoption of SFAS No. 128
                  and the acquisition of International Technidyne
                  Corporation).

      99          Opinion of Cazenove Incorporated dated May 2, 1997
                  (filed as Exhibit 99 to the Registrant's Current
                  Report on Form 8-K dated May 2, 1997 [File No.
                  1-10114] and incorporated herein by reference). 




                                                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 on the fifth anniversary of the date of
PAGE
<PAGE>
        the Loan, 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.

             The Plan and the Stock Holding Policy shall become effective
        upon approval and adoption by the Committee.
PAGE
<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 to the  Company
        from the Employee's annual cash incentive compensation  (referred
        to as  bonus), 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  occurring prior to  the Maturity Date,  such
        amount as may be designated by the Company. Any amount  remaining
        unpaid under this Note 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;
PAGE
<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  State  of
        Massachusetts and shall have the effect of a sealed instrument.


                                      _______________________________

                                      Employee Name: _________________


        ________________________
        Witness




                                                EXHIBIT 10.24
              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 18th day of
        December, 1997 by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
PAGE
<PAGE>
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
PAGE
<PAGE>
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
PAGE
<PAGE>
        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, 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 Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


                                      By:  _____________________________
                                           Melissa F.Riordan
                                      Title:    Treasurer


                                      THERMO CARDIOSYSTEMS INC. 


                                      By:  _____________________________
                                           Victor L. Poirier
                                      Title:    President





                                                EXHIBIT 10.25

              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 18th day of
        December, 1997 by and among Thermedics Inc. (the "Parent") and
        those of its subsidiaries that join in this Agreement by
        executing the signature page hereto (the "Majority Owned
        Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
PAGE
<PAGE>
             Parent as a result of the Parent Guarantee.  If a Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof
             provides a Credit Support Obligation for any subsidiary of
             the Parent, other than a subsidiary of such Majority Owned
             Subsidiary, and the beneficiary(ies) of the Credit Support
             Obligation enforce the Credit Support Obligation, or the
             Majority Owned Subsidiary or its wholly-owned subsidiary  
             performs under the Credit Support Obligation for any other
             reason, then the Parent shall indemnify and save harmless
             the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, from any liability, cost, expense
             or damage (including reasonable attorneys' fees) suffered by
             the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, as a result of the Credit Support
             Obligation.  Without limiting the foregoing, Credit Support
             Obligations include the deposit of funds by a Majority Owned
             Subsidiary or a wholly-owned subsidiary thereof in a credit
             arrangement with a banking facility whereby such funds are
             available to the banking facility as collateral for
             overdraft obligations of other Majority Owned Subsidiaries
             or their subsidiaries also participating in the credit
             arrangement with such banking facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
PAGE
<PAGE>
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.  

        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
PAGE
<PAGE>
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, 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 Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        6.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMEDICS INC.


                                      By:  _____________________________
                                           John W.Wood Jr.
                                      Title:    President


                                      THERMO CARDIOSYSTEMS INC. 


                                      By:  _____________________________
                                           Victor L. Poirier
                                      Title:    President









                                                                   Exhibit 13




















                            THERMO CARDIOSYSTEMS INC.

                        Consolidated Financial Statements

                                      1997
PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                        Consolidated Statement of Income

    (In thousands except per share amounts)    1997        1996        1995
    -----------------------------------------------------------------------
    Revenues (Note 11)                      $62,834     $63,962     $52,880
                                            -------     -------     -------
    Costs and Operating Expenses:
      Cost of revenues                       27,143      27,132      22,455
      Selling, general, and administrative
        expenses (Note 7)                    16,548      14,203      12,164
      Research and development expenses       8,682       7,498       7,111
      Write-off of acquired technology
        (Note 3)                                  -       4,909           -
                                            -------     -------     -------
                                             52,373      53,742      41,730
                                            -------     -------     -------

    Operating Income                         10,461      10,220      11,150

    Interest Income                           6,476       5,297       5,117
    Interest Expense (Note 6)                (2,244)        (80)       (274)
    Gain on Sale of Investments, Net
      (Note 2)                                    5         919         421
                                            -------     -------     -------
    Income Before Provision for Income
      Taxes                                  14,698      16,356      16,414
    Provision for Income Taxes (Note 5)       5,679       6,326       5,279
                                            -------     -------     -------
    Net Income                              $ 9,019     $10,030     $11,135
                                            =======     =======     =======
    Earnings per Share (Note 12):
      Basic                                 $   .23     $   .25     $   .29
                                            =======     =======     =======
      Diluted                               $   .23     $    25     $   .27
                                            =======     =======     =======
    Weighted Average Shares (Note 12):
      Basic                                  39,482      39,924      38,358
                                            =======     =======     =======
      Diluted                                39,765      40,929      40,650
                                            =======     =======     =======


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

                                        2PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                           Consolidated Balance Sheet

    (In thousands)                                          1997        1996
    ------------------------------------------------------------------------
    Assets
    Current Assets:
      Cash and cash equivalents                         $ 71,158    $  1,157
      Short-term available-for-sale investments,
        at quoted market value (amortized cost of
        $45,443 and $46,511; Note 2)                      45,589      46,455
      Accounts receivable, less allowances of $833
        and $736                                          11,377      13,490
      Inventories                                         14,519      13,870
      Prepaid and refundable income taxes (Note 5)         3,962       4,202
      Prepaid expenses and other current assets              342          43
                                                        --------    --------
                                                         146,947      79,217
                                                        --------    --------
    Property, Plant, and Equipment, at Cost, Net           8,481       8,500
                                                        --------    --------
    Long-term Available-for-sale Investments,
      at Quoted Market Value (amortized cost
      of $12,655 and $33,929; Note 2)                     12,665      33,920
                                                        --------    --------
    Prepaid Income Taxes (Note 5)                          2,749       2,704
                                                        --------    --------
    Other Assets                                           2,366         637
                                                        --------    --------
                                                        $173,208    $124,978
                                                        ========    ========







                                        3PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                     Consolidated Balance Sheet (continued)

    (In thousands except share amounts)                   1997          1996
    ------------------------------------------------------------------------
    Liabilities and Shareholders' Investment
    Current Liabilities:
      Current maturity of subordinated convertible
        obligations (Note 6)                          $      -      $  3,755
      Accounts payable                                   2,291         3,502
      Accrued payroll and employee benefits              2,749         2,675
      Accrued warranty expenses                          1,100           770
      Accrued income taxes                                 912           102
      Other accrued expenses                             2,885         3,018
      Due to parent company and Thermo Electron
        Corporation                                        308            67
                                                      --------      --------
                                                        10,245        13,889
                                                      --------      --------
    Subordinated Convertible Debentures (Note 6)        70,000             -
                                                      --------      --------

    Commitments and Contingency (Notes 7 and 8)

    Shareholders' Investment (Notes 4 and 9):
      Common stock, $.10 par value, 100,000,000
        shares authorized; 40,520,521 and 40,227,962
        shares issued                                    4,052         4,023
      Capital in excess of par value                    98,252        93,234
      Retained earnings                                 32,096        22,727
      Treasury stock at cost, 1,502,474 and 235,509 
        shares                                         (41,563)       (8,854)
      Cumulative translation adjustment                     26             -
      Net unrealized gain (loss) on available-for-sale
        investments (Note 2)                               100           (41)
                                                      --------      --------
                                                        92,963       111,089
                                                      --------      --------
                                                      $173,208      $124,978
                                                      ========      ========


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






                                        4PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                      Consolidated Statement of Cash Flows

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Operating Activities:
      Net income                            $  9,019    $ 10,030    $ 11,135
      Adjustments to reconcile net income
        to net cash provided by operating
        activities:
          Write-off of acquired technology
            (Note 3)                               -       4,909           -
          Depreciation and amortization        2,571       2,182       2,013
          Provision for losses on accounts
            receivable                           120         165         120
          Gain on sale of investments, net
            (Note 2)                              (5)       (919)       (421)
          Deferred income tax benefit           (170)     (1,838)     (1,775)
          Other noncash items                    (13)         60          36
          Changes in current accounts,
            excluding the effects of
            acquisition:
              Accounts receivable              1,987      (4,017)     (1,045)
              Inventories                       (658)     (3,976)     (3,513)
              Other current assets               (14)        899        (737)
              Accounts payable                (1,210)        458       1,045
              Other current liabilities        2,396       2,586       2,316
                                            --------    --------    --------
    Net cash provided by operating
      activities                              14,023      10,539       9,174
                                            --------    --------    --------
    Investing Activities:
      Acquisition (Note 3)                         -      (5,013)          -
      Proceeds from sale and maturities
        of available-for-sale investments    103,390      89,615      84,782
      Purchases of available-for-sale
        investments                          (81,043)    (83,947)    (92,707)
      Purchases of property, plant, and
        equipment                             (2,333)     (2,570)     (3,347)
      Proceeds from sale of property,
        plant, and equipment                     107           -           -
      Other                                      (70)       (134)       (218)
                                            --------    --------    --------
    Net cash provided by (used in)
      investing activities                  $ 20,051    $ (2,049)   $(11,490)
                                            --------    --------    --------




                                        5PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                Consolidated Statement of Cash Flows (continued)

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Financing Activities:
      Net proceeds from issuance of 
        subordinated convertible 
        debentures (Note 6)                 $ 68,028    $      -    $      -
      Purchases of Company common stock      (32,957)     (5,665)          -
      Net proceeds from issuance of Company
        common stock                             602         741         947
      Payment of withholding taxes related
        to stock option exercises               (138)     (1,283)     (1,500)
      International Technidyne transfers of
        cash (to) from Thermo Electron           350      (5,567)     (2,158)
                                            --------    --------    --------
    Net cash provided by (used in)
      financing activities                    35,885     (11,774)     (2,711)
                                            --------    --------    --------
    Exchange Rate Effect on Cash                  42           -           -
                                            --------    --------    --------
    Increase (Decrease) in Cash and Cash
      Equivalents                             70,001      (3,284)     (5,027)
    Cash and Cash Equivalents at Beginning
      of Year                                  1,157       4,441       9,468
                                            --------    --------    --------
    Cash and Cash Equivalents at End of Year$ 71,158    $  1,157    $  4,441
                                            ========    ========    ========

    Cash Paid For:
      Interest                              $  1,672    $      -    $     29
      Income taxes                          $  2,961    $  2,260    $  3,191

    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)                $  3,755    $  7,887    $ 21,808
                                            ========    ========    ========


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

                                        6PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

               Consolidated Statement of Shareholders' Investment

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Common Stock, $.10 Par Value
      Balance at beginning of year          $  4,023    $  2,636    $  2,511
      Issuance of stock under employees'
        and directors' stock plans                 3           9          22
      Conversions of subordinated
        convertible obligations (Note 6)          26          54         103
      Effect of three-for-two stock split          -       1,324           -
                                            --------    --------    --------
      Balance at end of year                   4,052       4,023       2,636
                                            --------    --------    --------
    Capital in Excess of Par Value
      Balance at beginning of year            93,234      84,125      58,862
      Issuance of stock under employees'
        and directors' stock plans               211         452         522
      Tax benefit related to employees'
        and directors' stock plans             1,078       2,190       3,335
      Conversions of subordinated
        convertible obligations (Note 6)       3,729       7,791      21,406
      Effect of three-for-two stock split          -      (1,324)          -
                                            --------    --------    --------
      Balance at end of year                  98,252      93,234      84,125
                                            --------    --------    --------

    Retained Earnings
      Balance at beginning of year            22,727      18,264       9,287
      Net income                               9,019      10,030      11,135
      International Technidyne Transfer of
        cash (to) from Thermo Electron           350      (5,567)     (2,158)
                                            --------    --------    --------
      Balance at end of year                  32,096      22,727      18,264
                                            --------    --------    --------
    Treasury Stock
      Balance at beginning of year            (8,854)     (2,186)     (1,089)
      Activity under employees' and
        directors' stock plans                   248      (1,003)     (1,097)
      Purchases of Company common stock      (32,957)     (5,665)          -
                                            --------    --------    --------

      Balance at end of year                 (41,563)     (8,854)     (2,186)
                                            --------    --------    --------
    Cumulative Translation Adjustment
      Balance at beginning of year                 -           -           -
      Translation adjustment                      26           -           -
                                            --------    --------    --------
      Balance at end of year                      26           -           -
                                            --------    --------    --------
    Net Unrealized Gain (Loss) on Available-
      for-sale Investments
      Balance at beginning of year               (41)        577      (1,189)
      Change in net unrealized gain (loss)
        on available-for-sale investments
        (Note 2)                                 141        (618)      1,766
                                            --------    --------    --------
      Balance at end of year                     100         (41)        577
                                            --------    --------    --------
    Total Shareholders' Investment          $ 92,963    $111,089    $103,416
                                            ========    ========    ========
    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        7PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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.
    The Company's International Technidyne Corporation subsidiary is a
    leading manufacturer of near-patient, whole-blood coagulation testing
    equipment and related disposables. International Technidyne also
    manufactures premium-quality, single-use skin-incision devices. The
    Company's Nimbus Medical Inc. subsidiary is involved in the research and
    development of ventricular devices and total artificial hearts.

    Relationship with Thermedics Inc. and Thermo Electron Corporation
        The Company was incorporated in 1988 as a wholly owned subsidiary of
    Thermedics Inc. Prior to that time, the business was conducted as a
    division of Thermedics. Thermedics is a 58%-owned subsidiary of Thermo
    Electron Corporation. As of January 3, 1998, Thermedics and Thermo
    Electron owned a total of 23,206,320 shares of the Company's common
    stock, representing 59% of such stock outstanding, including 3,355,705
    shares issuable to Thermo Electron for the acquisition of International
    Technidyne (Note 3). 

    Principles of Consolidation
        The accompanying financial statements include the accounts of the
    Company and its wholly owned subsidiaries. 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 1997, 1996, and 1995 are for the fiscal years
    ended January 3, 1998, December 28, 1996, and December 30, 1995,
    respectively. Fiscal year 1997 included 53 weeks; 1996 and 1995 each
    included 52 weeks.

    Revenue Recognition
        The Company recognizes the majority of its revenues upon shipment of
    its products. The Company provides a reserve for its estimate of warranty
    costs at the time of shipment. Revenues and profits on long-term research
    and development contracts are recognized using the
    percentage-of-completion method. Revenues recorded under the
    percentage-of-completion method were $1,991,000 in 1997. The
    percentage-of-completion is determined by relating the actual costs
    incurred to date to management's estimate of total costs to be incurred
    on each contract. If a loss is indicated on any contract in process, a
    provision is made currently for the entire loss. Contracts generally
    provide for the billing of customers in a cost-plus-fixed-fee basis as
    costs are incurred.
                                        8PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

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

    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
        During the fourth quarter of 1997, the Company adopted SFAS No. 128,
    "Earnings per Share" (Note 12). As a result, all previously reported
    earnings per share have been restated and the Company is required to
    report diluted earnings per share; however, diluted earnings per share
    equals the Company's previously reported earnings per share for 1996 and
    1995. Basic earnings per share have been computed by dividing net income
    by the weighted average number of shares outstanding during the year.
    Diluted earnings per share have been computed assuming the conversion of
    convertible obligations and the elimination of the related interest
    expense, and the exercise of stock options, as well as their related
    income tax effects.

    Cash and Cash Equivalents
        At year-end 1997 and 1996, $70,488,000 and $1,018,000, respectively,
    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 corporate notes, commercial paper,
    U.S. government-agency securities, 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. At year-end 1997 and 1996,
    the Company's cash equivalents also include investments in commercial
    paper and short-term certificates of deposit of the Company's foreign
    operations which have an original maturity of three months or less. Cash
    equivalents are carried at cost, which approximates market value.
                                        9PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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)                                           1997      1996
    -----------------------------------------------------------------------
    Raw materials                                         $ 3,420   $ 9,111
    Work in process                                         8,381     3,043
    Finished goods                                          2,718     1,716
                                                          -------   -------
                                                          $14,519   $13,870
                                                          =======   =======

    Property, Plant, and Equipment
        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: buildings,
    15 and 31.5 years; machinery and equipment, three to ten years, and
    leasehold improvements, the shorter of the term of the lease or the life
    of the asset. Property, plant, and equipment consists of the following:


    (In thousands)                                           1997      1996
    -----------------------------------------------------------------------
    Land                                                  $   341   $   341
    Buildings                                               2,445     2,445
    Machinery, equipment, and leasehold improvements       15,075    13,048
                                                          -------   -------
                                                           17,861    15,834

    Less: Accumulated depreciation and amortization         9,380     7,334
                                                          -------   -------
                                                          $ 8,481   $ 8,500
                                                          =======   =======

    Other Assets
        Other assets in the accompanying consolidated balance sheet include
    the cost of acquired patents and trademarks and in 1997 deferred debt
    expense relating to the Company's issuance of subordinated convertible
    debentures. These assets are being amortized using the straight-line
    method over their estimated useful lives, which range from 7 to 40 years.
    These assets were $2,145,000 and $331,000, net of accumulated
    amortization of $358,000 and $130,000, at year-end 1997 and 1996,
    respectively.
                                       10PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

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

    Stock Split
        All share and per share information was restated in 1996 to reflect a
    three-for-two stock split effected in the form of a 50% stock dividend,
    distributed in May 1996.

    Foreign Currency
        All assets and liabilities of the Company's foreign subsidiary are
    translated at year-end exchange rates, and revenues and expenses are
    translated at average exchange rates for the year in accordance with SFAS
    No. 52, "Foreign Currency Translation." Resulting translation adjustments
    are reflected as a separate component of shareholders' investment titled
    "Cumulative translation adjustment." Foreign currency transaction gains
    and losses are included in the accompanying statement of income and are
    not material for each of the three years presented.

    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.

    Presentation
        The historical information for all periods presented has been
    restated to reflect the May 2, 1997, acquisition of International
    Technidyne, which has been accounted for at historical cost in a manner
    similar to a pooling of interests (Note 3).

    2.  Available-for-sale Investments

        In accordance with SFAS No. 115, "Accounting for Certain Investments
    in Debt and Equity Securities," the Company's debt 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." 
                                       11PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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 are as follows:

                                                        Gross        Gross
                             Market         Cost   Unrealized   Unrealized
    (In thousands)            Value        Basis        Gains       Losses
    -----------------------------------------------------------------------
    1997
    Government-agency
      securities            $55,391      $55,334      $    66      $    (9)
    Corporate bonds           1,001        1,000            1            -
    Other                     1,862        1,764          172          (74)
                            -------      -------      -------      -------
                            $58,254      $58,098      $   239      $   (83)
                            =======      =======      =======      =======
    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)
                            =======      =======      =======      =======

        Short- and long-term available-for-sale investments in the
    accompanying 1997 balance sheet include $45,589,000 with contractual
    maturities of one year or less, and $12,665,000 with contractual
    maturities of more than one year through 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 $5,000 in 1997, and 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, relating to the sale of
    available-for-sale investments.

    3.  Acquisitions

        On May 2, 1997, the Company acquired International Technidyne from
    Thermo Electron in exchange for the right to receive 3,355,705 shares of
    the Company's common stock. International Technidyne is a leading
    manufacturer of near-patient, whole-blood coagulation testing equipment
    and related disposables and also manufactures premium-quality,
    single-use skin-incision devices.
                                       12PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Acquisitions (continued)

        Because the Company and International Technidyne were deemed for
    accounting purposes to be under control of their common majority owner,
    Thermo Electron, the transaction has been accounted for at historical
    cost in a manner similar to a pooling of interests. Accordingly, all
    historical financial information presented has been restated to include
    the acquisition of International Technidyne. The 3,355,705 shares of the
    Company's common stock issuable in connection with the acquisition will
    not be issued until the listing of such shares for trading upon the
    American Stock Exchange has been approved by the Company's shareholders.
    Because Thermedics is the majority shareholder, is controlled by Thermo
    Electron, and intends to vote its shares in favor of such listing, the
    approval is assured and, therefore, the shares are considered to be
    outstanding and the results of International Technidyne are included for
    all periods presented.
        Revenues and net income, as previously reported by the separate
    entities prior to the acquisition and as restated for the combined
    Company, are as follows:

    (In thousands)                                           1996      1995
    -----------------------------------------------------------------------
    Revenues:
      Historical                                          $29,970   $20,593
      International Technidyne                             33,992    32,287
                                                          -------   -------
                                                          $63,962   $52,880
                                                          =======   =======
    Net income:
      Historical                                          $ 5,358   $ 6,925
      International Technidyne                              4,672     4,210
                                                          -------   -------
                                                          $10,030   $11,135
                                                          =======   =======

        In December 1996, the Company acquired substantially all of the
    assets, subject to certain liabilities, of Nimbus Medical, Inc., 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
    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.
                                       13PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Acquisitions (continued)

        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.



                                       14PAGE
<PAGE>



   Thermo Cardiosystems Inc.                         1997 Financial Statements

                   Notes to Consolidated Financial Statements

   4.  Employee Benefit Plans (continued)

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

                              1997              1996              1995
                        ----------------  ----------------  ----------------
                               Weighted           Weighted          Weighted
                       Number   Average   Number   Average Number    Average
   (Shares in              of  Exercise       of  Exercise     of   Exercise
   thousands)          Shares     Price   Shares     Price Shares      Price
   -------------------------------------------------------------------------
   Options outstanding,
     beginning of year  1,130    $14.59    1,137    $ 9.84  1,458     $ 6.05

       Granted            783     27.22      189     32.90    121      28.34

       Exercised         (119)     4.95     (179)     3.67   (429)      2.13

       Forfeited         (148)    24.42      (17)    15.55    (13)     11.03
                        -----              -----            -----
   Options outstanding,
     end of year        1,646    $20.41    1,130    $14.59  1,137     $ 9.84
                        =====    ======    =====    ======  =====     ======
   Options exercisable  1,646    $20.41    1,130    $14.59  1,137     $ 9.84
                        =====    ======    =====    ======  =====     ======
   Options available
     for grant            318                453              625
                        =====              =====            =====

       A summary of the status of the Company's stock options at January 3,
   1998, 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                        651         4.9 years     $ 8.86
    13.11 -  25.06                        112         8.4 years      23.35
    25.07 -  37.01                        842         8.6 years      27.82
    37.02 -  48.97                         41         4.4 years      43.56
                                        -----
   $ 1.15 - $48.97                      1,646         7.0 years     $20.41
                                        =====



                                       15PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Employee Benefit Plans (continued)

    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 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 1997, 1996, and
    1995, the Company issued 435 shares, 3,469 shares, and 7,881 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 1997, 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)        1997      1996      1995
    -----------------------------------------------------------------------
    Net income:
      As reported                               $ 9,019   $10,030   $11,135
      Pro forma                                   7,658     9,495    11,005
    Basic earnings per share:
      As reported                                   .23       .25       .29
      Pro forma                                     .19       .24       .29
    Diluted earnings per share:
      As reported                                   .23       .25       .27
      Pro forma                                     .19       .23       .27

        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.
                                       16PAGE
<PAGE>

    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Employee Benefit Plans (continued)

        The weighted average fair value per share of options granted was
    $15.92, $18.23, and $14.02 in 1997, 1996, and 1995, respectively. 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:

                                                1997       1996        1995
    -----------------------------------------------------------------------
    Volatility                                   51%        50%         50%
    Risk-free interest rate                     6.4%       6.2%        6.0%
    Expected life of options               6.6 years  6.6 years   4.7 years

        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.

    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 $410,000,
    $459,000, and $413,000 in 1997, 1996, and 1995, respectively.

    5.  Income Taxes

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

    (In thousands)                             1997        1996        1995
    -----------------------------------------------------------------------
    Domestic                                $14,808     $16,081     $16,414
    Foreign                                    (110)        275           -
                                            -------     -------     -------
                                            $14,698     $16,356     $16,414
                                            =======     =======     =======
                                       17PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Income Taxes (continued)

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

    (In thousands)                              1997       1996        1995
    -----------------------------------------------------------------------
    Currently payable:
      Federal                                $ 4,838    $ 7,440     $ 6,333
      State                                    1,011        724         721
                                             -------    -------     -------
                                               5,849      8,164       7,054
                                             -------    -------     -------
    Net deferred (prepaid):
      Federal                                   (136)    (2,115)     (1,697)
      State                                      (34)       277         (78)
                                             -------    -------     -------
                                                (170)    (1,838)     (1,775)
                                             -------    -------     -------
                                             $ 5,679    $ 6,326     $ 5,279
                                             =======    =======     =======

        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
    exercise. The provision for income taxes that is currently payable does
    not reflect $1,078,000, $2,190,000, and $3,335,000 of such benefits that
    have been allocated to capital in excess of par value in 1997, 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 35% in 1997 and 34% in 1996 and 1995 to income
    before provision for income taxes due to the following:

    (In thousands)                             1997        1996        1995
    -----------------------------------------------------------------------
    Provision for income taxes at statutory
      rate                                  $ 5,144     $ 5,561     $ 5,581
    Increases (decreases) resulting from:
      State income taxes, net of federal tax    635         660         424
      Foreign sales corporation benefit        (160)       (111)       (103)
      Reversal of valuation allowance             -           -        (725)
      Other                                      60         216         102
                                            -------     -------     -------
                                            $ 5,679     $ 6,326     $ 5,279
                                            =======     =======     =======

        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.
                                       18PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Income Taxes (continued)

        Short- and long-term prepaid income taxes in the accompanying balance
    sheet consist of the following:

    (In thousands)                                          1997      1996
    ----------------------------------------------------------------------
    Prepaid income taxes:
      Inventory basis difference                          $1,334    $1,314
      State tax loss and credit carryforwards                612       434
      Available-for-sale investments                         (56)       23
      Depreciation and amortization                          971       958
      Accrued compensation                                   580       277
      Allowance for doubtful accounts                        211       189
      Reserves and accruals                                1,097     1,136
      Write-off of acquired technology (Note 3)            1,834     1,865
      Other, net                                             128       381
                                                          ------    ------
                                                          $6,711    $6,577
                                                          ======    ======

        The Company has available $6,300,000 of state net operating loss
    carryforwards which expire from 1998 through 2002 and $100,000 of state
    tax credit carryforwards which expire from 2000 through 2012.

    6.  Subordinated Convertible Debentures

        In May 1997, the Company issued and sold at par $70,000,000 principal
    amount of 4 3/4% subordinated convertible debentures due 2004, for net
    proceeds of $68,028,000. The debentures are convertible into shares of
    the Company's common stock at a conversion price of $31.415 per share.
        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. During 1997, 1996, and 1995, $3,755,000,
    $7,887,000, and $21,358,000, respectively, of principal amount of these
    subordinated convertible debentures and, in 1995, $450,000 principal
    amount of the Company's 5 1/2% subordinated convertible notes were
    converted into 259,078 shares, 544,168 shares, and 1,541,976 shares,
    respectively, of the Company's common stock.
        The Company's convertible debentures 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 debentures.

    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 paid Thermo Electron
    annually an amount equal to 1.0% of the Company's revenues in 1997 and
                                       19PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    7.  Related-party Transactions (continued)

    1996 and 1.20% of the Company's revenues in 1995. Beginning in fiscal
    1998, the Company will pay an annual fee equal to 0.8% of the Company's
    revenues. The annual fee is reviewed and adjusted annually by mutual
    agreement of the parties. 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 $963,000, $958,000, and $865,000 in
    1997, 1996, and 1995, respectively. 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).
    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. The
    sublease expires in February 1999. The accompanying statement of income
    includes expenses from the sublease of $170,000, $116,000, and $134,000
    in 1997, 1996, and 1995, respectively. Currently, the cost of the area
    occupied by the Company is $170,000 per year.
        In 1997, the Company subleased approximately 8,000 square feet of
    office and research facilities from Thermedics Detection Inc., a publicly
    traded majority-owned subsidiary of Thermedics, under a two-year sublease
    agreement. Under this sublease, the Company will pay Thermedics Detection
    base rent of $40,000 in the first year and $44,000 in the second year, as
    well as approximately $33,000 per year, representing the Company's pro
    rata allocation of the facility's aggregate operating costs, real estate
    taxes, and utilities. The accompanying statement of income includes
    expenses from this sublease agreement of $73,000 in 1997.
        The Company leases office space on a month-to-month basis from an
    affiliate which is controlled by Thermo Electron. The accompanying
    statement of income includes expenses from this lease of $9,000, $8,000,
    and $17,000 in 1997, 1996, and 1995, respectively.

    Repurchase Agreement
        The Company invests excess cash in a repurchase agreement with Thermo
    Electron as discussed in Note 1.
                                       20PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    8.  Commitment and Contingency

    Operating Lease
        In addition to the related-party operating leases described in Note
    7, the Company leases manufacturing, office, and research facilities
    under two operating lease agreements expiring in 1999 and 2000. The
    accompanying statement of income includes expense from these leases of
    $551,000, $188,000, and $13,000 in 1997, 1996, and 1995, respectively.
    Future minimum payments due under these leases at January 3, 1998, are
    $331,000 in 1998; $236,000 in 1999; $124,000 in 2000; $116,000 in 2001;
    and $117,000 in 2002. Total future minimum lease payments are $924,000.

    Contingency
        The Company has received correspondence alleging that the textured
    surface of the LVAS housing infringes 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 January 3, 1998, the Company had reserved 4,511,098 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 subordinated convertible debentures. The carrying amounts of these
    financial instruments, with the exception of subordinated 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.
                                       21PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    10. Fair Value of Financial Instruments (continued)

        The fair value of the Company's subordinated convertible debentures
    was determined based on quoted market prices. The carrying amount and
    fair value of the Company's subordinated convertible debentures were
    $70,000,000 and $74,900,000 in 1997, respectively, and $3,755,000 and
    $7,435,000 in 1996, respectively.

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

    Significant Customer
        Sales to one customer accounted for 24%, 23%, and 25% of the
    Company's total revenues in 1997, 1996, and 1995, respectively.

    Export Sales
        Export revenues to European countries accounted for 9%, 10%, and 11%
    of the Company's total revenues in 1997, 1996, and 1995, respectively.
    Export revenues to other countries accounted for 7%, 8%, and 7% of the
    Company's total revenues in 1997, 1996, and 1995, respectively.

    Concentrations of Risk
        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.
        The Company sells its products to customers in the healthcare
    industry. The Company does not normally require collateral or other
    security to support its accounts receivable. Management does not believe
    that this concentration of credit risk has, or will have, a significant
    negative impact on the Company.








                                       22PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    12. Earnings per Share

    (In thousands except per share amounts)    1997        1996        1995
    -----------------------------------------------------------------------
    Basic
    Net income                              $ 9,019     $10,030     $11,135
                                            -------     -------     -------
    Weighted average shares                  36,126      36,568      35,002
    Shares issuable in connection with the
      acquisition of International
      Technidyne (Note 3)                     3,356       3,356       3,356
                                            -------     -------     -------
                                             39,482      39,924      38,358
                                            -------     -------     -------
    Basic earnings per share                $   .23     $   .25     $   .29
                                            =======     =======     =======
    Diluted
    Net income                              $ 9,019     $10,030     $11,135
    Effect of convertible debentures              -           -           5
                                            -------     -------     -------
    Income available to common
      shareholders, as adjusted             $ 9,019     $10,030     $11,140
                                            -------     -------     -------
    Basic weighted average shares            39,482      39,924      38,358
    Effect of:
      Convertible debentures                      2         559       1,778
      Stock options                             281         446         514
                                            -------     -------     -------
    Weighted average shares, as adjusted     39,765      40,929      40,650
                                            -------     -------     -------
    Diluted earnings per share              $   .23     $   .25     $   .27
                                            =======     =======     =======

        The computation of diluted earnings per share excludes the effect of
    assuming the exercise of certain outstanding stock options because the
    effect would be antidilutive. At January 3, 1998, there were 883,100 of
    such options outstanding, with exercise prices ranging from $26.48 to
    $48.97 per share.
        In addition, the computation of diluted earnings per share for 1997
    excludes the effect of assuming the conversion of $70,000,000 principal
    amount of 4 3/4% subordinated convertible debentures, convertible at
    $31.415 per share, because the effect would be antidilutive.

                                       23PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    13. Unaudited Quarterly Information

    (In thousands except per share amounts)

    1997                      First       Second        Third       Fourth
    ----------------------------------------------------------------------
    Revenues                $14,902      $15,931      $14,727      $17,274
    Gross profit              7,973        8,703        8,674       10,341
    Net income                1,875        2,222        2,228        2,694
    Basic and diluted
      earnings per share        .05          .06          .06          .07

    1996                      First       Second        Third       Fourth(a)
    -------------------------------------------------------------------------
    Revenues                $15,405      $15,893      $16,084      $16,580
    Gross profit              8,896        9,501        9,787        8,646
    Net income (loss)         3,431        3,573        3,962         (936)
    Earnings (loss) per
      share:
        Basic                   .09          .09          .10         (.02)
        Diluted                 .08          .09          .10         (.02)
    ____________
    (a) Includes a write-off of $4,909,000 of acquired technology.








                                       24PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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 51%-owned subsidiary
    of Thermedics Inc.) and subsidiaries as of January 3, 1998, and December
    28, 1996, and the related consolidated statements of income,
    shareholders' investment, and cash flows for each of the three years in
    the period ended January 3, 1998. 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 subsidiaries as of January 3, 1998, and
    December 28, 1996, and the results of their operations and their cash
    flows for each of the three years in the period ended January 3, 1998, in
    conformity with generally accepted accounting principles.



                                           Arthur Andersen LLP



    Boston, Massachusetts
    February 12, 1998



                                       25PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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
    heading "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 1994.
        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., 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.
        The Company's International Technidyne Corporation subsidiary is a
    leading manufacturer of near-patient, whole-blood coagulation testing
    equipment and related disposables and also manufactures premium-quality,
    single-use skin-incision devices.

                                       26PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

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

    Results of Operations

    1997 Compared With 1996
        Revenues were $62,834,000 in 1997, compared with $63,962,000 in 1996.
    This decrease was primarily due to a $6,612,000 decrease in revenues from
    the Company's air-driven LVAS, offset in part by a $1,943,000 increase in
    revenues from the Company's electric LVAS. The Company expects that
    revenues from sales of its LVAS will stabilize at approximately current
    levels until the electric system is approved in the U.S. for commercial
    sale. The Company believes that this approval could occur within the
    first six months of 1998, however, there can be no assurance that the
    Company will receive this approval within the expected time period, or at
    all. The decrease in revenues in 1997 was also offset in part by the
    inclusion of $1,992,000 in revenues from Nimbus, acquired in December
    1996, as well as an increase in revenues from International Technidyne to
    $35,873,000 in 1997 from $33,992,000 in 1996. International Technidyne's
    revenues increased primarily due to increased demand.
        The gross profit margin decreased to 57% in 1997 from 58% in 1996,
    primarily due to a shift in the sales mix to the lower-margin electric
    LVAS and, to a lesser extent, increased warranty costs due to a
    Company-initiated modification of certain of its LVAS, completed in the
    first quarter of 1997. 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. This decrease was offset, in part, by improved
    margins at International Technidyne, primarily due to manufacturing
    efficiencies. The Company announced an overall price increase of
    approximately 10% in the electric LVAS product line, effective June 28,
    1997, to help offset increased production costs.
        Selling, general, and administrative expenses as a percentage of
    revenues increased to 26% in 1997 from 22% in 1996, primarily due to
    higher marketing expenses as a result of an increase in the Company's
    LVAS sales force and, to a lesser extent, an increase in promotional
    expenses at International Technidyne.
        Research and development expenses increased to $8,682,000 in 1997
    from $7,498,000 in 1996, primarily due to a clinical trial being
    conducted by the Company to evaluate the electric LVAS as an alternative
    to medical therapy and, to a lesser extent, the inclusion of expenditures
    at Nimbus, acquired in December 1996. The Company expects research and
    development expenses to continue to increase over the life of the
    clinical trial, estimated at two to three years. There can be no
    assurance that the Company will complete this study or that it will
    receive FDA approval of the electric LVAS as an alternative to medical
    therapy during this time period, or at all.
        In connection with the December 1996 acquisition of the Nimbus
    business, the Company wrote off $4,909,000 in 1996, which represents the
    portion of the purchase price allocated to technology in development
    based on estimated replacement cost (Note 3).
        Interest income increased to $6,476,000 in 1997 from $5,297,000 in
    1996, primarily as a result of higher average invested balances resulting
    from the sale of $70,000,000 principal amount of 4 3/4% subordinated
    convertible debentures in May 1997 (Note 6).

                                       27PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

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

    1997 Compared With 1996 (continued)
        Interest expense increased to $2,244,000 in 1997 from $80,000 in
    1996, primarily as a result of the issuance of the 4 3/4% subordinated
    convertible debentures.
        The Company recorded a gain on sale of investments, net, of $5,000 in
    1997, compared with $919,000 in 1996 (Note 2).
        The effective tax rates were 39% in both 1997 and 1996. The effective
    tax rates exceeded the statutory federal income tax rate primarily due to
    the impact of state income taxes.
        The Company is currently assessing the potential impact of the year
    2000 on the processing of date-sensitive information by the Company's
    computerized information systems and on products sold as well as products
    purchased by the Company. The Company believes that its internal
    information systems and current products are either year 2000 compliant
    or will be so prior to the year 2000 without incurring additional costs.
    There can be no assurance, however, that the Company will not experience
    unexpected costs and delays in achieving year 2000 compliance for its
    internal information systems and current products, which could result in
    a material adverse effect on the Company's future results of operations.
        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the company's future results of operations.

    1996 Compared With 1995
        Revenues in 1996 increased 21% to $63,962,000 from $52,880,000 in
    1995, primarily due to a $9,377,000 increase in LVAS sales and, to a
    lesser extent, a $1,705,000 increase in sales of International Technidyne
    products, primarily due to an increase in demand.
        The gross profit margin remained constant at 58% in 1996 and 1995.
    The LVAS product 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. In
    addition, the gross profit margin at International Technidyne decreased
    slightly to 57% in 1996 from 58% in 1995, due primarily to increased
    costs associated with a new facility.
        Selling, general, and administrative expenses as a percentage of
    revenues decreased slightly to 22% in 1996 from 23% in 1995. LVAS-related
    expenses as a percentage of revenues remained constant at 20% in 1996 and
    1995. Higher marketing expenses due to an increase in the Company's LVAS
    sales force were offset by lower expenses as a percentage of revenues due
    to an increase in LVAS sales volume. Selling, general, and administrative
    expenses as a percentage of revenues declined slightly at International
    Technidyne to 24% in 1996 from 25% in 1995 due to an increase in
    revenues.
                                       28PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

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

    1996 Compared With 1995 (continued)
        Research and development expenses of $7,498,000 in 1996 and
    $7,111,000 in 1995 reflect the Company's continued commitment to product
    development.
        In connection with the December 1996 acquisition of the Nimbus
    business, 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.
        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 32% 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.

    Liquidity and Capital Resources
        Working capital was $136,702,000 at January 3, 1998, compared with
    $65,328,000 at December 28, 1996. Cash, cash equivalents, and short- and
    long-term available-for-sale investments were $129,412,000 at January 3,
    1998, compared with $81,532,000 at December 28, 1996. During 1997,
    $14,023,000 of cash was provided by operating activities. Cash of
    $1,987,000 was provided by a decrease in accounts receivable, due to
    improved collections. In addition, cash of $1,186,000 was provided by an
    increase in current liabilities, primarily accrued income taxes.
        During 1997, the Company's primary investing activity, excluding
    available-for-sale investments activity, was the expenditure of
    $2,333,000 for purchases of property, plant, and equipment.
        During 1997, the Company's financing activities provided $35,885,000
    of cash. In May 1997, the Company issued and sold at par $70,000,000
    principal amount of 4 3/4% subordinated convertible debentures due 2004,
    for net proceeds of $68,028,000 (Note 6). Through a series of actions
    commencing in August 1996, the Company's Board of Directors has
    authorized the repurchase, through various dates ending in June 1998, of
    up to $50.0 million of its own securities in the open market, or in
    negotiated transactions. Any repurchases under the Company's
    authorizations are funded from working capital. Through January 3, 1998,
    the Company had expended $38,622,000 under these authorizations of which
    $32,957,000 was funded in 1997.
        In 1998, the Company expects to make capital expenditures of
    approximately $4,000,000, including expenditures for manufacturing and
    tooling equipment and leasehold improvements. The Company believes it has
    adequate resources to meet its financial needs for the foreseeable
    future.
                                       29PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 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 1998 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 biomedical devices, including its left ventricular-assist
    systems (LVAS), are subject to approval by the U.S. Food and Drug
    Administration (FDA) before commercial sale of such devices may commence
    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 and other regulatory approvals have been
    obtained, such approvals can be suspended or revoked if the Company's
    products do not continue to satisfy regulatory requirements. 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's HeartPak(TM) portable console 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.
        In June 1997, the Company submitted a premarket approval (PMA)
    supplemental application to receive FDA approval of its electric LVAS for
    use as a bridge to transplant. This application is currently under
    review; however, no assurance can be given that the FDA will review this
    application on a timely basis or will grant approval once its review is
    complete. Significant 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 likely require patients supported by the
    pneumatic LVAS to remain hospitalized. This could materially restrict the
    market for the pneumatic LVAS.

        Uncertainty of Patient Reimbursement. The cost of implanting a
    cardiac support system is substantial. In addition, the Company's
    coagulation testing equipment can cost several thousand dollars per
    instrument. Without the financial support of the government or
    third-party insurers, the market for the Company's devices and equipment

                                       30PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                           Forward-looking Statements

    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 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. HCFA's coverage
    policy could also extend to the electric LVAS once approved; however,
    there can be no assurance that HCFA's coverage will extend to the
    electric LVAS. In addition, some major nongovernment insurers currently
    offer coverage for the electric LVAS because of its investigational
    device exemption status as a category B device (eligible for Medicare
    coverage and payment). Even though reimbursement has been established by
    HCFA and by certain nongovernment insurers for the pneumatic LVAS, 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 or for the Company's biomedical devices
    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. In addition,
    acceptance by these physicians of the Company's whole-blood coagulation
    monitoring systems and Coumadin monitors is also important to the success
    of the Company's business. The Company has developed working
    relationships with a number of leading medical centers, and its existing
    and proposed LVAS and its blood coagulation monitoring systems 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

                                       31PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                           Forward-looking Statements

    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.
    Further, the Company has several competitors in the coagulation
    monitoring instrument market. Although the length of the regulatory
    approval process for medical equipment and devices such as LVAS is a
    barrier to entry into these markets, the Company's products could be
    rendered obsolete or uneconomical by technological advances by one or
    more of the Company's present competitors or by future entrants into the
    markets in which the Company competes. 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 with respect to its LVAS and its reagents, however,
    with respect to its coagulation equipment and skin-incision products, the
    Company relies principally on patents to protect its proprietary rights.
    No assurance can be given that the Company will be able to effectively
    protect its patents and 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

                                       32PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                           Forward-looking Statements

    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.
    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's LVAS business was
    engaged only in research and development. 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 volume, 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 LVAS 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 LVAS 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.

        International Operations and International Sales. In 1997, sales
    originating outside the U.S. and U.S. export sales accounted for
    approximately 19% of the Company's total revenues. The Company

                                       33PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                           Forward-looking Statements

    anticipates that sales outside the U.S. and U.S. export sales will
    continue to account for a significant percentage of the Company's total
    revenues. The Company intends to continue to expand its presence in
    international markets. International revenues are subject to a number of
    risks, including the following: agreements may be difficult to enforce
    and receivables difficult to collect through a foreign country's legal
    system; foreign customers may have longer payment cycles; foreign
    countries may impose additional withholding taxes or otherwise tax the
    Company's foreign income, impose tariffs or adopt other restrictions on
    foreign trade; U.S. export licenses may be difficult to obtain; the
    protection of intellectual property in foreign countries may be more
    difficult to enforce; and fluctuations in exchange rates may affect
    product demand and may adversely affect the profitability in U.S. dollars
    of products and services provided by the Company in foreign markets where
    payment for the Company's products and services is made in the local
    currency. There can be no assurance that any of these factors will not
    have a material effect on the Company's business and results of
    operations.

        Potential Impact of Year 2000 on Processing of Date-Sensitive
    Information. The Company is currently assessing the potential impact of
    the year 2000 on the processing of date-sensitive information by the
    Company's computerized information systems and on products sold as well
    as products purchased by the Company. The Company believes that its
    internal information systems and current products are either year 2000
    compliant or will be so prior to the year 2000 without incurring
    additional costs. There can be no assurance, however, that the Company
    will not experience unexpected costs and delays in achieving year 2000
    compliance for its internal information systems and current products,
    which could result in a material adverse effect on the Company's future
    results of operations.
        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the Company's future results of operations.





                                       34PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements

                         Selected Financial Information

    (In thousands except
    per share amounts)    1997(a)    1996(b)    1995(c)    1994(d)    1993
    -----------------------------------------------------------------------
    Statement of
      Income Data:
    Revenues          $ 62,834   $ 63,962   $ 52,880   $ 39,051   $ 27,849
    Net income           9,019     10,030     11,135      5,687      2,336
    Earnings per share:
      Basic                .23        .25        .29        .15        .06
      Diluted              .23        .25        .27        .14        .06

    Balance Sheet
      Data:
    Working capital   $136,702   $ 65,328   $ 64,610   $ 47,369   $ 19,048
    Total assets       173,208    124,978    124,285    109,988     74,225
    Long-term 
      obligations       70,000          -     11,642     33,450        600
    Shareholders'
      investment        92,963    111,089    103,416     68,382     67,514
    ____________
    (a) Reflects the May 1997 issuance of $70,000,000 principal amount of 
        4 3/4% subordinated convertible debentures due 2004 and conversion
        of $3,755,000 principal amount of noninterest-bearing subordinated
        convertible obligations.
    (b) Reflects conversion of $7,887,000 principal amount of
        noninterest-bearing subordinated convertible obligations and the
        December 1996 acquisition of Nimbus Medical, Inc.
    (c) Reflects conversion of $21,358,000 principal amount of noninterest-
        bearing subordinated convertible obligations.
    (d) Reflects the January 1994 issuance of $33,000,000 principal amount
        of noninterest-bearing subordinated convertible obligations due
        1997.


                                       35PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements


    Common Stock Market Information
        The Company's common stock is traded on the American Stock Exchange
    under the symbol TCA. The following table sets forth the high and low
    sale prices of the Company's common stock for 1997 and 1996, as reported
    in the consolidated transaction reporting system.

                                       1997                  1996
                               -------------------    -------------------
    Quarter                       High        Low        High        Low
    ---------------------------------------------------------------------

    First                      $32        $20 1/2     $55 1/3    $39 1/3
    Second                      28 7/8     19          55 3/8     39 7/12
    Third                       27 1/4     19 1/8      44 5/8     29 1/2
    Fourth                      28 7/8     19          38 1/4     23 3/8

        As of January 30, 1998, the Company had 469 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 30, 1998, was $21 7/8 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, (781) 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. Distribution of
    printed quarterly reports is limited to the second quarter only. All
    material will be available from Thermo Electron's Internet site
    (http://www.thermo.com/subsid/tca1.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

    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.

                                       36PAGE
<PAGE>
    Thermo Cardiosystems Inc.                       1997 Financial Statements


    Form 10-K Report
        A copy of the Annual Report on Form 10-K for the fiscal year ended
    January 3, 1998, 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 1,
    1998, at 1:30 p.m., at the Hyatt Regency Hotel, Scottsdale, Arizona.










                                       37





                                                                   Exhibit 21

                                                                             
                            THERMO CARDIOSYSTEMS INC.
                         Subsidiaries of the Registrant


        As of February 20, 1998, the Registrant owned the following
    subsidiaries:

                                                                 Registrant's
                                          State or Jurisdiction      % of
    Name                                     of Incorporation     Ownership
    ------------------------------------------------------------------------

    Nimbus Inc.                               Massachusetts          100
    TCA Securities Corporation                Massachusetts          100
    International Technidyne Corporation         Delaware            100
      International Technidyne Corp. Ltd.           UK               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 12, 1998,
    included in or incorporated by reference into Thermo Cardiosystems Inc.'s
    Annual Report on Form 10-K for the year ended January 3, 1998, 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, Registration Statement No. 333-5671
    on Form S-3, Registration Statement No. 333-29287 on Form S-3, and
    Registration Statement No. 333-08809 on Form S-8.



                                                 Arthur Andersen LLP


    Boston, Massachusetts
    March 16, 1998


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<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED JANUARY 3,
1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
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<SECURITIES>                                    45,589
<RECEIVABLES>                                   12,210
<ALLOWANCES>                                       833
<INVENTORY>                                     14,519
<CURRENT-ASSETS>                               146,947
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<TOTAL-LIABILITY-AND-EQUITY>                   173,208
<SALES>                                         62,834
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<CGS>                                           27,143
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<NET-INCOME>                                     9,019
<EPS-PRIMARY>                                      .23
<EPS-DILUTED>                                      .23
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONATINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 30,
1995 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-30-1995
<PERIOD-END>                               DEC-30-1995
<CASH>                                           4,441
<SECURITIES>                                    46,123
<RECEIVABLES>                                   10,196
<ALLOWANCES>                                       571
<INVENTORY>                                      9,835
<CURRENT-ASSETS>                                73,837
<PP&E>                                          13,416
<DEPRECIATION>                                   5,518
<TOTAL-ASSETS>                                 124,285
<CURRENT-LIABILITIES>                            9,227
<BONDS>                                         11,642
                                0
                                          0
<COMMON>                                         2,636
<OTHER-SE>                                     100,780
<TOTAL-LIABILITY-AND-EQUITY>                   124,285
<SALES>                                         52,880
<TOTAL-REVENUES>                                52,880
<CGS>                                           22,455
<TOTAL-COSTS>                                   22,455
<OTHER-EXPENSES>                                 7,111
<LOSS-PROVISION>                                   120
<INTEREST-EXPENSE>                                 274
<INCOME-PRETAX>                                 16,414
<INCOME-TAX>                                     5,279
<INCOME-CONTINUING>                             11,135
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    11,135
<EPS-PRIMARY>                                      .29
<EPS-DILUTED>                                      .27
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S QUARTERLY REPORT ON FORM 10-K FOR THE QUARTER ENDED MARCH 
30, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-30-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                          11,065
<SECURITIES>                                    50,870
<RECEIVABLES>                                   10,818
<ALLOWANCES>                                       601
<INVENTORY>                                     10,807
<CURRENT-ASSETS>                                86,065
<PP&E>                                          14,245
<DEPRECIATION>                                   6,071
<TOTAL-ASSETS>                                 126,083
<CURRENT-LIABILITIES>                           11,108
<BONDS>                                         11,367
                                0
                                          0
<COMMON>                                         2,757
<OTHER-SE>                                     100,851
<TOTAL-LIABILITY-AND-EQUITY>                   126,083
<SALES>                                         15,405
<TOTAL-REVENUES>                                15,405
<CGS>                                            6,509
<TOTAL-COSTS>                                    6,509
<OTHER-EXPENSES>                                 1,813
<LOSS-PROVISION>                                    30
<INTEREST-EXPENSE>                                  28
<INCOME-PRETAX>                                  5,222
<INCOME-TAX>                                     1,791
<INCOME-CONTINUING>                              3,431
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,431
<EPS-PRIMARY>                                      .09
<EPS-DILUTED>                                      .08
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEUDLE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S QUARTERLY REPORT ON FORM 10-K FOR THE QUARTER ENDED 
JUNE 29, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL 
STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-29-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                           7,741
<SECURITIES>                                    54,146
<RECEIVABLES>                                   12,206
<ALLOWANCES>                                       601
<INVENTORY>                                     12,504
<CURRENT-ASSETS>                                89,348
<PP&E>                                          14,900
<DEPRECIATION>                                   6,546
<TOTAL-ASSETS>                                 129,173
<CURRENT-LIABILITIES>                           11,369
<BONDS>                                          8,532
                                0
                                          0
<COMMON>                                         3,989
<OTHER-SE>                                     105,283
<TOTAL-LIABILITY-AND-EQUITY>                   129,173
<SALES>                                         31,298
<TOTAL-REVENUES>                                31,298
<CGS>                                           12,901
<TOTAL-COSTS>                                   12,901
<OTHER-EXPENSES>                                 3,691
<LOSS-PROVISION>                                    30
<INTEREST-EXPENSE>                                  55
<INCOME-PRETAX>                                 10,981
<INCOME-TAX>                                     3,977
<INCOME-CONTINUING>                              7,004
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,004
<EPS-PRIMARY>                                      .18
<EPS-DILUTED>                                      .17
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
CARDIOSYSTEMS INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
SEPTEMBER 28, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               SEP-28-1996
<CASH>                                          16,654
<SECURITIES>                                    45,457
<RECEIVABLES>                                   13,396
<ALLOWANCES>                                       631
<INVENTORY>                                     13,963
<CURRENT-ASSETS>                                92,179
<PP&E>                                          15,259
<DEPRECIATION>                                   7,011
<TOTAL-ASSETS>                                 131,861
<CURRENT-LIABILITIES>                           12,366
<BONDS>                                          6,097
                                0
                                          0
<COMMON>                                         4,007
<OTHER-SE>                                     109,391
<TOTAL-LIABILITY-AND-EQUITY>                   131,861
<SALES>                                         47,382
<TOTAL-REVENUES>                                47,382
<CGS>                                           19,198
<TOTAL-COSTS>                                   19,198
<OTHER-EXPENSES>                                 5,456
<LOSS-PROVISION>                                    60
<INTEREST-EXPENSE>                                  66
<INCOME-PRETAX>                                 17,456
<INCOME-TAX>                                     6,490
<INCOME-CONTINUING>                             10,966
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    10,966
<EPS-PRIMARY>                                      .28
<EPS-DILUTED>                                      .27
        


</TABLE>

<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>
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                           1,157
<SECURITIES>                                    46,455
<RECEIVABLES>                                   14,224
<ALLOWANCES>                                       736
<INVENTORY>                                     13,870
<CURRENT-ASSETS>                                79,217
<PP&E>                                          15,834
<DEPRECIATION>                                   7,334
<TOTAL-ASSETS>                                 124,978
<CURRENT-LIABILITIES>                           13,889
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         4,023
<OTHER-SE>                                     107,066
<TOTAL-LIABILITY-AND-EQUITY>                   124,978
<SALES>                                         63,962
<TOTAL-REVENUES>                                63,962
<CGS>                                           27,132
<TOTAL-COSTS>                                   27,132
<OTHER-EXPENSES>                                12,407
<LOSS-PROVISION>                                   165
<INTEREST-EXPENSE>                                  80
<INCOME-PRETAX>                                 16,356
<INCOME-TAX>                                     6,326
<INCOME-CONTINUING>                             10,030
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    10,030
<EPS-PRIMARY>                                      .25
<EPS-DILUTED>                                      .25
        




</TABLE>


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