THERMO ELECTRON CORP
SC 13D/A, EX-2, 2000-10-06
MEASURING & CONTROLLING DEVICES, NEC
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                          AGREEMENT AND PLAN OF MERGER

                                  by and among

                       THORATEC LABORATORIES CORPORATION

                          LIGHTNING ACQUISITION CORP.

                          THERMO ELECTRON CORPORATION

                                      and

                           THERMO CARDIOSYSTEMS INC.




                          dated as of October 3, 2000


<PAGE>


                          AGREEMENT AND PLAN OF MERGER


      THIS AGREEMENT AND PLAN OF MERGER (this  "Agreement")  is made and entered
into as of October 3, 2000 by and among  Thoratec  Laboratories  Corporation,  a
California   corporation   ("Thoratec"),    Lightning   Acquisition   Corp.,   a
Massachusetts  corporation  and wholly  owned  subsidiary  of Thoratec  ("Merger
Sub"),  Thermo  Cardiosystems  Inc., a Massachusetts  corporation  ("TCA"),  and
Thermo Electron Corporation,  a Delaware corporation and majority stockholder of
TCA ("TEC"), with respect to the following facts:

      A. The respective boards of directors of Thoratec, Merger Sub, TCA and TEC
have approved and declared  advisable the merger of Merger Sub with and into TCA
(the  "Merger"),  upon the terms and subject to the conditions set forth herein,
and have determined that the Merger and the other  transactions  contemplated by
this  Agreement  are fair to, and in the best  interests  of,  their  respective
stockholders.

      B. Pursuant to the Merger,  among other things,  the outstanding shares of
TCA Common Stock,  $0.10 par value ("TCA Common Stock"),  will be converted into
the right to receive shares of Thoratec  Common Stock,  no par value  ("Thoratec
Common Stock"), at the rate set forth herein.

      C. Simultaneously with the execution and delivery of this Agreement and as
a  condition  and  inducement  to the  parties'  willingness  to enter into this
Agreement,  TEC and Thoratec  are entering  into a  Shareholder  Agreement  (the
"Shareholder  Agreement") and a Registration Rights Agreement (the "Registration
Rights Agreement").

      D. For United States federal income tax purposes,  it is intended that the
Merger will qualify as a  reorganization  under the provisions of Section 368(a)
of the Internal Revenue Code of 1986, as amended (the "Code").



ACCORDINGLY, THE PARTIES AGREE AS FOLLOWS:




<PAGE>



                                    ARTICLE I

                                   THE MERGER



1.1 The Merger. At the Effective Time (as defined in Section 1.2) and subject to
and  upon  the  terms  and  conditions  of this  Agreement  and  the  applicable
provisions of Massachusetts  Business Corporation Law (the "Massachusetts Law"),
(i) Merger Sub shall be merged with and into TCA,  (ii) the  separate  corporate
existence  of Merger  Sub  shall  cease,  and  (iii) TCA shall be the  surviving
corporation.  TCA, as the surviving corporation after the Merger, is hereinafter
sometimes referred to as the "Surviving Corporation."

1.2  Closing;   Effective  Time.  The  closing  of  the  Merger  and  the  other
transactions  contemplated hereby (the "Closing") will take place at 10:00 a.m.,
local time, on a date to be specified by the parties (the "Closing Date"), which
shall be no later than the third  business day after  satisfaction  or waiver of
the conditions set forth in Articles VI and VII,  unless another time or date is
agreed to by the parties hereto.  The Closing shall take place at the offices of
Heller Ehrman White & McAuliffe LLP, 333 Bush Street, San Francisco, California,
or at such other  location as the parties hereto shall  mutually  agree.  At the
Closing,  the parties  hereto shall cause the Merger to be consummated by filing
Articles of Merger (the "Articles of Merger") with the Secretary of State of the
Commonwealth of  Massachusetts  that, as appropriate,  reflect the provisions of
this Agreement and are otherwise in accordance  with the relevant  provisions of
the  Massachusetts  Law (the time of such  filing,  or such later time as may be
agreed in writing by the parties and specified in the Articles of Merger,  being
the "Effective Time").

1.3  Effects of the Merger.  The  effects of the Merger  shall be as provided in
this  Agreement,  the Articles of Merger and the  applicable  provisions  of the
Massachusetts Law. Without limiting the foregoing, at the Effective Time all the
property, rights, privileges,  powers and franchises of TCA and Merger Sub shall
vest in the Surviving Corporation,  and all debts, liabilities and duties of TCA
and Merger Sub shall become the debts,  liabilities  and duties of the Surviving
Corporation.

1.4 Certificate of Incorporation;  Bylaws.

     (a) Subject to Section 5.8, from and after the Effective Time, the Articles
of Organization of Merger Sub, as in effect  immediately  prior to the Effective
Time,  shall be the  Articles  of  Organization  of the  Surviving  Corporation,


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<PAGE>


provided that the name of the Surviving  Corporation  shall be changed to a name
that does not include the word "Thermo" or any confusingly similar name.

     (b) Subject to Section 5.8, from and after the Effective  Time,  the bylaws
of Merger Sub, as in effect  immediately  prior to the Effective Time,  shall be
the bylaws of the Surviving Corporation.

1.5 Directors and Officers of the Surviving Corporation.  At the Effective Time,
all of the directors and officers of TCA and  Subsidiaries  of TCA shall resign.
The directors and officers of Merger Sub immediately prior to the Effective Time
shall serve as the initial directors and officers of the Surviving  Corporation,
until their respective successors are duly elected or appointed and qualified.



                                   ARTICLE II

                              CONVERSION OF SHARES



2.1 Conversion of Stock.  Pursuant to the Merger,  and without any action on the
part of the holders of any outstanding  shares of capital stock or securities of
TCA or Merger Sub:

     (a) As of the  Effective  Time,  each share of TCA Common  Stock issued and
outstanding  immediately  prior to the Effective  Time (other than shares of TCA
Common  Stock to be  canceled  pursuant  to  Section  2.1(c)  and other than TCA
Dissenting  Shares  (as  defined  in  Section  2.3(f))  shall  be  automatically
converted  into .835 (the  "Exchange  Ratio") of a fully paid and  nonassessable
share of Thoratec Common Stock.

     (b) As of the Effective  Time, each holder of a certificate or certificates
which immediately prior to the Effective Time represented  outstanding shares of
TCA Common Stock shall cease to have any rights with respect thereto, except the
right to receive (i) a certificate  (or direct  registration)  representing  the
number of whole shares of Thoratec Common Stock into which such shares have been
converted (the "Thoratec Certificates"),  and (ii) cash in lieu of any aggregate
fractional  share of Thoratec  Common Stock in accordance  with Section  2.1(f),
without interest.

     (c) As of the Effective Time, each share of TCA Common Stock held of record
immediately  prior to the  Effective  Time by TCA,  Merger Sub,  Thoratec or any


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<PAGE>

Subsidiary  (as  defined  in  Section  2.1(g))  of TCA or of  Thoratec  shall be
canceled and extinguished without any conversion thereof.

     (d) As of the Effective Time, each share of Common Stock, $0.001 par value,
of Merger Sub (the "Merger Sub Common Stock") issued and outstanding immediately
prior to the Effective Time shall be canceled,  extinguished  and  automatically
converted into one validly issued,  fully paid and nonassessable share of Common
Stock,  $0.10  par  value,  of  the  Surviving  Corporation.   Each  certificate
evidencing  ownership  of a number of shares of Merger Sub Common Stock shall be
deemed to evidence ownership of the same number of shares of Common Stock, $0.10
par value, of the Surviving Corporation.

     (e)  The  Exchange  Ratio  shall  be  adjusted,   or  Thoratec  shall  make
appropriate  provision,  to reflect appropriately the effect of any stock split,
reverse stock split,  stock dividend  (including any dividend or distribution of
securities  convertible  into  Thoratec  Common  Stock  or  TCA  Common  Stock),
extraordinary  dividend or  distribution,  reorganization,  recapitalization  or
other like change with  respect to Thoratec  Common Stock or (subject to Section
5.1) TCA Common Stock  occurring or having a record date or an effective date on
or after the date hereof and prior to the Effective Time.

     (f) No  fraction  of a share of  Thoratec  Common  Stock  will be issued by
virtue of the Merger.  Instead,  each  holder of shares of TCA Common  Stock who
would  otherwise  be entitled to a fraction of a share of Thoratec  Common Stock
(after aggregating all fractional shares of Thoratec Common Stock to be received
by such holder)  shall  receive from Thoratec an amount of cash (rounded down to
the nearest whole cent) equal to the product of (i) such fraction, multiplied by
(ii) the Thoratec Closing Value.  For the purposes of this Agreement,  "Thoratec
Closing  Value" shall mean the closing price per share of Thoratec  Common Stock
as reported on the Nasdaq National  Market System  ("Nasdaq") on the trading day
immediately preceding the Effective Time.

     (g) For the  purposes of this  Agreement,  the  "Exchange  Multiple" of any
quantity means the product obtained by multiplying such quantity by the Exchange
Ratio, and the "Exchange  Quotient" of any quantity means the quotient  obtained
from  dividing  such  quantity  by the  Exchange  Ratio.  For  purposes  of this
Agreement,  the term "Subsidiary",  when used with respect to any Person,  means
any corporation or other organization,  whether  incorporated or unincorporated,
of which (A) at least a majority of the securities or other interests  having by
their terms ordinary  voting power to elect a majority of the board of directors
or others performing similar functions with respect to such corporation or other
organization  is  directly  or  indirectly  owned or  controlled  by such Person


                                       4
<PAGE>

(through  ownership of securities,  by contract or otherwise) or (B) such Person
or any Subsidiary of such Person is a general partner of any general partnership
or a manager of any limited liability  company.  For purposes of this Agreement,
"Person" means any individual,  group, organization,  corporation,  partnership,
joint venture, limited liability company, trust or entity of any kind.

2.2 TCA Options; TCA Purchase Plan.

     (a) As of the Effective Time,  Thoratec shall, to the full extent permitted
by applicable law, assume all of the stock options of TCA, whether or not vested
or immediately exercisable,  outstanding immediately prior to the Effective Time
under the TCA Stock Plans (as defined below) (the "TCA  Options").  For purposes
of this  Agreement,  "TCA Stock  Plans"  means TCA's 1999  Amended and  Restated
Directors Stock Option Plan, 1999 Amended and Restated Equity Incentive Plan and
1999 Amended and  Restated  Non-Qualified  Stock  Option Plan.  Each TCA Option,
whether or not  exercisable  at the Effective  Time,  shall,  to the full extent
permitted  by  applicable  law,  be assumed by Thoratec in such a manner that it
shall vest and otherwise be  exercisable  upon the same terms and  conditions as
under the TCA Stock Plan  pursuant to which it was  granted  and the  applicable
option  agreement  issued  thereunder;   provided  that  (i)  each  such  option
thereafter  shall be exercisable for a number of shares of Thoratec Common Stock
(rounded down to the nearest whole share) equal to the Exchange  Multiple of the
number of shares of TCA Common Stock subject to such option, and (ii) the option
price per share of Thoratec  Common  Stock  thereafter  shall equal the Exchange
Quotient (rounded up to the nearest whole cent) of the option price per share of
TCA Common  Stock  subject  to such  option in effect  immediately  prior to the
Effective Time (the "Thoratec Exchange  Options").  Prior to the Effective Time,
TCA shall make all adjustments  provided for in the TCA Stock Plans with respect
to the TCA Options to facilitate the implementation of this Section 2.2(a).

     (b)  Effective  November 1, 2000,  TCA shall suspend  participation  in its
November 1, 1992 Amended and Restated  Employee  Stock  Purchase  Plan (the "TCA
Purchase Plan").  Accordingly,  immediately before the Effective Time there will
be no outstanding  purchase rights under the TCA Purchase Plan. Further, the TCA
Purchase Plan shall be  terminated  effective at the  Effective  Time,  with the
result that no additional  purchase  rights shall be granted after the Effective
Time.

     (c) TCA shall terminate its Deferred  Compensation  Plan for Directors (the
"Directors'  Plan") so that as of the Effective Time no additional  rights shall
be  granted  under  the  Directors'   Plan.  As  of  the  Effective  Time,  each
then-outstanding right to purchase TCA Common Stock granted under the Directors'


                                       5
<PAGE>

Plan shall be assumed by Thoratec in such a manner that each such purchase right
shall  thereafter  be  exercisable  for whole  shares of Thoratec  Common  Stock
(rounded down to the nearest whole share) equal to the Exchange  Multiple of the
number of shares  of TCA  Common  Stock for  which  such  purchase  right  would
otherwise have been  exercisable  determined as of the relevant grant date under
the Directors'  Plan,  with the exercise price for each share of Thoratec Common
Stock under those assumed  purchase rights being equal to the Exchange  Quotient
(rounded  up to the  nearest  whole  cent) of the price per share of TCA  Common
Stock under those rights just before the Effective Time.  Thoratec shall include
all such shares of Thoratec  Common Stock issuable under the Directors'  Plan in
the Registration Statement (as described in Section 3.24).

2.3 Exchange of Stock Certificates.

     (a) At or  prior  to the  Effective  Time,  Thoratec  shall  enter  into an
agreement  with a bank or trust  company  selected  by Thoratec  and  reasonably
acceptable  to TCA to act as the  exchange  agent for the Merger (the  "Exchange
Agent").

     (b) At or prior to the Effective Time, Thoratec shall supply or cause to be
supplied to or for the account of the Exchange Agent in trust for the benefit of
the holders of TCA Common Stock, for exchange  pursuant to this Section 2.3: (i)
certificates (or direct  registration)  evidencing the shares of Thoratec Common
Stock issuable pursuant to Section 2.1 to be exchanged for outstanding shares of
TCA Common Stock,  and (ii) cash in an aggregate  amount  sufficient to make the
payments in lieu of fractional shares provided for in Section 2.1(f).

     (c) Within three  business days after the transfer agent for the TCA Common
Stock delivers, to the Exchange Agent, the required information about the record
holders  of  TCA  Common  Stock  as of  the  record  time  for  determining  the
stockholders  of TCA who will receive the merger  consideration,  Thoratec shall
mail or shall  cause to be mailed  to each  Holder a letter  of  transmittal  in
customary form (which shall specify that delivery shall be effected, and risk of
loss and title to the TCA Certificates  shall pass, only upon proper delivery of
the TCA  Certificates to the Exchange Agent) and  instructions  for surrender of
the TCA Certificates. Upon surrender to the Exchange Agent of a TCA Certificate,
together  with such letter of  transmittal  duly  executed,  the Holder shall be
entitled to receive in  exchange  therefor:  (i)  certificates  evidencing  that
number of shares of Thoratec  Common Stock issuable to such Holder in accordance
with this Article II; (ii) any dividends or other distributions that such Holder
has the right to receive pursuant to Section 2.3(d) and (iii) cash in respect of
fractional  shares as provided in Section  2.1(f),  and such TCA  Certificate so
surrendered shall forthwith be canceled.  No certificate  representing shares of


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<PAGE>

Thoratec Common Stock will be issued to a Person who is not the registered owner
of a surrendered TCA  Certificate  unless (i) the TCA Certificate so surrendered
has been properly endorsed or otherwise is in proper form for transfer, and (ii)
such Person shall either (A) pay any transfer or other tax required by reason of
such issuance or (B) establish to the reasonable  satisfaction  of the Surviving
Corporation that such tax has been paid or is not applicable.  Until surrendered
in accordance with this Section 2.3, from and after the Effective Time, each TCA
Certificate shall be deemed to represent, for all purposes other than payment of
dividends,  the right to receive a certificate  representing  the number of full
shares of Thoratec Common Stock as determined in accordance with this Article II
and cash in lieu of  fractional  shares  as  provided  in  Section  2.1(f).  For
purposes  of  this  Agreement,   "TCA  Certificate"  means  a  certificate  that
immediately prior to the Effective Time represented  shares of TCA Common Stock,
and  "Holder"  means a person who holds one or more TCA  Certificates  as of the
Effective Time.


     (d) No dividend or other  distribution  declared  with  respect to Thoratec
Common Stock with a record date after the Effective Time will be paid to Holders
of  unsurrendered  TCA  Certificates  until  such  Holders  surrender  their TCA
Certificates.  Upon the surrender of such TCA Certificates,  there shall be paid
to such Holders, promptly after such surrender, the amount of dividends or other
distributions,  excluding  interest,  declared  with a  record  date  after  the
Effective Time and not paid because of the failure to surrender TCA Certificates
for exchange.

     (e) Notwithstanding anything to the contrary in this Agreement, neither the
Exchange Agent,  Thoratec,  the Surviving Corporation nor any party hereto shall
be liable to any  holder of shares of TCA Common  Stock for  shares of  Thoratec
Common Stock or cash in lieu of fractional shares delivered to a public official
pursuant to any applicable abandoned property, escheat or similar law.

     (f)  Notwithstanding  any provision of this Agreement to the contrary,  the
shares of TCA Common Stock (i) held by a Holder who,  acting in accordance  with
Sections 85 et seq. of Chapter  156B of the  Massachusetts  Law,  before the TCA
Special  Meeting (as defined in Section  5.4(a)) has  delivered to TCA a written
notice of such  Holder's  intention to demand  payment in cash for such Holder's
shares of TCA  Common  Stock if the  Merger is  completed  and (ii) that are not
voted in favor of the  Merger,  shall not be  converted  into a right to receive
shares of Thoratec Common Stock but rather shall entitle their Holder to receive
the  appraised  value of such shares under those  sections of the  Massachusetts
Law.  (Shares of TCA Common Stock  meeting the  requirements  of clauses (i) and
(ii)  of the  previous  sentence  are  referred  to in  this  Agreement  as "TCA
Dissenting  Shares".) If, however,  after the Effective Time such Holder validly


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<PAGE>

and  effectively  withdraws  that  Holder's  right to  demand  payment  for that
Holder's  TCA  Dissenting  Shares,  those shares shall be treated as if they had
been converted as of the Effective Time into the right to receive that number of
shares of Thoratec  Common Stock set forth in Section 2.1(a),  without  interest
and  irrespective  of the then-value of such shares.  Subject in all respects to
Sections 2.1 and 2.3,  Thoratec shall then cause the Exchange Agent to deliver a
certificate representing those shares to that Holder.

     (g) TCA shall give Thoratec:  (A) prompt notice of any written  demands for
payment of any TCA Common  Stock,  withdrawals  of such  demands,  and any other
documents and written  communications  that relate to such demands,  and (B) the
opportunity to direct all  negotiations  and proceedings with respect to demands
for appraisal under the Massachusetts  Law. TCA shall not, except with the prior
written  consent of  Thoratec,  make any payment with respect to any demands for
appraisal of TCA Common Stock or offer to settle or settle any such demands.

2.4  Lost,  Stolen  or  Destroyed  Certificates.  In  the  event  that  any  TCA
Certificates shall have been lost, stolen or destroyed, the Exchange Agent shall
issue and pay in respect of such lost,  stolen or  destroyed  TCA  Certificates,
upon the making of an affidavit of that fact by the holder thereof, certificates
representing the shares of Thoratec Common Stock as may be required  pursuant to
Section 2.1 and cash in lieu of  fractional  shares,  if any, as may be required
pursuant to Section 2.1(f) and any dividends or  distributions  payable pursuant
to Section  2.3(d);  provided  that  Thoratec  may, in its  discretion  and as a
condition  precedent  to the issuance  thereof,  require the owner of such lost,
stolen or  destroyed  TCA  Certificates  to deliver a bond in such sum as it may
reasonably  direct  as  indemnity  against  any claim  that may be made  against
Thoratec or the Exchange Agent with respect to the TCA  Certificates  alleged to
have been lost, stolen or destroyed.

2.5 Tax  Consequences.  For United States  federal  income tax  purposes,  it is
intended  by the  parties  hereto  that the Merger  qualify as a  reorganization
within the meaning of Section  368(a) of the Code. The execution and delivery of
this  Agreement  by each party  shall be  considered  the  adoption of a plan of
reorganization by such party for purposes of Section 368 of the Code.


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<PAGE>

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES
                                     OF TCA



      TCA makes to Thoratec and Merger Sub the  representations  and  warranties
contained in this Article III, in each case subject to the  exceptions set forth
in the disclosure  statement,  dated as of the date hereof,  delivered by TCA to
Thoratec  prior  to  the  execution  of  this  Agreement  (the  "TCA  Disclosure
Statement"). The TCA Disclosure Statement is arranged in schedules corresponding
to the numbered and lettered Sections of this Article III, and the disclosure in
any  Schedule  of  the  TCA   Disclosure   Statement   shall  qualify  only  the
corresponding Section of this Article III.

3.1   Organization, Etc.

     (a)  Each of TCA and its  Subsidiaries  is a  corporation  duly  organized,
validly  existing and in good standing under the laws of the jurisdiction of its
incorporation,  and has all  requisite  power and  authority  to own,  lease and
operate its properties and to carry on its business as now being conducted. Each
of TCA  and its  Subsidiaries  is  duly  qualified  as a  foreign  Person  to do
business,  and is in good standing,  in each jurisdiction where the character of
its owned or  leased  properties  or the  nature of its  activities  makes  such
qualification necessary,  except where the failure to be so qualified or in good
standing  would  not,  individually  or in the  aggregate,  have a TCA  Material
Adverse  Effect.  For the  purposes of this  Agreement,  "TCA  Material  Adverse
Effect" means any change,  event,  circumstance or effect that is, or (including
with the passage of time) is likely to be or become,  materially  adverse to the
general affairs, business,  operations,  prospects, assets, condition (financial
or otherwise) or results of  operations of TCA and its  Subsidiaries  taken as a
whole,  provided that: (i) any adverse  change,  event,  circumstance  or effect
arising from or relating to general  business or economic  conditions which does
not affect TCA and its  Subsidiaries  in a  materially  disproportionate  manner
compared to other entities in TCA's and its  Subsidiaries'  industries shall not
be deemed to  constitute,  and shall not be taken into  account in  determining,
whether  there has been, a "TCA  Material  Adverse  Effect" and (ii) any adverse
change,  circumstance,   event  or  effect  arising  from  or  relating  to  the
announcement  or pendency of the Merger shall not be deemed to  constitute,  and
shall not be taken into account in  determining  whether  there has been, a "TCA
Material Adverse Effect".

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<PAGE>

     (b)  Neither  TCA  nor  any  of its  Subsidiaries  is in  violation  of any
provision of its Articles of Organization, bylaws or any other charter document.
Schedule 3.1(b) of the TCA Disclosure  Statement sets forth (i) the full name of
each Subsidiary of TCA, its capitalization and the ownership interest of TCA and
each other Person (if any)  therein,  (ii) the  jurisdiction  in which each such
Subsidiary is organized,  (iii) each  jurisdiction  in which TCA and each of its
Subsidiaries  is  qualified  to do  business as a foreign  Person,  (iv) a brief
summary of the business and material  operations of each  Subsidiary of TCA, and
(v)  the  names  of the  current  directors  and  officers  of TCA  and of  each
Subsidiary  of TCA.  TCA has made  available  to Thoratec  accurate and complete
copies of the Articles of Organization,  bylaws and any other charter documents,
as currently in effect, of TCA and each of its Subsidiaries.

3.2 Authority. TCA has full corporate power and authority to execute and deliver
this Agreement and the other  agreements  required to be signed by it under this
Agreement to complete the Merger (together,  the "TCA Agreements") and, assuming
the approval of the Merger by a majority of the outstanding shares of TCA Common
Stock at the TCA Special Meeting or any  adjournment or postponement  thereof in
accordance  with  Massachusetts  Law,   consummate  the  Merger  and  the  other
transactions  contemplated hereby. TEC has full corporate power and authority to
execute and deliver this Agreement,  the Shareholder Agreement, the Registration
Rights Agreement and the other agreements required to be signed by it under this
Agreement  to  complete  the Merger  (collectively,  the "TEC  Agreements")  and
consummate the transaction  contemplated  thereby. The execution and delivery of
the TCA Agreements and the TEC Agreements and the consummation of the Merger and
the other  transactions  contemplated  hereby  and  thereby,  have been duly and
validly authorized by the boards of directors of TCA (with respect to the Merger
and  the TCA  Agreements)  and  TEC  (with  respect  to the  Merger  and the TEC
Agreements),  and no other  corporate  proceedings on the part of TCA or TEC are
necessary to authorize the TCA Agreements or the TEC Agreements or to consummate
the Merger and the other  transactions  contemplated  hereby and thereby  (other
than,  with  respect to the Merger,  the approval of the Merger by a majority of
the  outstanding  shares of TCA Common  Stock at the TCA Special  Meeting or any
adjournment or postponement  thereof in accordance with the Massachusetts  Law).
The TCA Agreements have been duly and validly executed and delivered by TCA and,
assuming due  authorization,  execution and delivery by Thoratec and Merger Sub,
constitute  valid and  binding  agreements  of TCA,  enforceable  against TCA in
accordance with their terms, except to the extent that their  enforceability may
be limited by applicable bankruptcy, insolvency,  reorganization,  moratorium or
other laws  affecting  the  enforcement  of  creditors'  rights  generally or by
general  equitable  principles.  The TEC  Agreements  have been duly and validly
executed and  delivered by TEC and,  assuming due  authorization,  execution and


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<PAGE>

delivery by Thoratec and Merger Sub, constitute the valid and binding agreements
of TEC,  enforceable  against TEC in accordance with their terms,  except to the
extent  that  their  enforceability  may be limited  by  applicable  bankruptcy,
insolvency,  reorganization,  moratorium or other laws affecting the enforcement
of creditors' rights generally or by general equitable principles.

3.3 No  Violations,  Etc.  No filing  with or  notification  to,  and no permit,
authorization,   consent  or  approval  of,  any  domestic  or  foreign   court,
administrative  agency,  commission,  or other  governmental or regulatory body,
authority or instrumentality  ("Government  Entity") is necessary on the part of
TCA or TEC  for  the  consummation  by TCA  of the  Merger  or any of the  other
transactions  contemplated by the TCA Agreements or the TEC  Agreements,  or for
the exercise by Thoratec,  TCA and their  Subsidiaries of full rights to own and
operate their businesses as presently being conducted, except (i) for the filing
of the  Articles  of Merger  as  required  by the  Massachusetts  Law,  (ii) the
applicable  requirements  of the  Securities  Exchange  Act of 1934,  as amended
(together with the Rules and Regulations promulgated  thereunder,  the "Exchange
Act"),  state  securities or "blue sky" laws and state  takeover laws, and (iii)
filings required under the Hart-Scott-Rodino  Antitrust Improvements Act of 1976
(the "HSR Act").  None of the execution and delivery of the TCA  Agreements  and
the  TEC  Agreements,  the  consummation  of the  Merger  or  any  of the  other
transactions  contemplated hereby and thereby, or compliance by TCA and TEC with
all of the provisions hereof and thereof,  or the exercise by Thoratec,  TCA and
their  Subsidiaries of full rights to own and operate their businesses after the
Merger as presently  being  conducted  (subject to obtaining the approval of the
Merger by the  holders of a  majority  of the  outstanding  shares of TCA Common
Stock at the TCA Special Meeting or any  adjournment or postponement  thereof in
accordance with the Massachusetts  Law) will: (i) conflict with or result in any
breach of any  provision  of the Articles of  Organization,  bylaws or any other
charter  document  of TCA or any of its  Subsidiaries,  (ii)  violate any order,
writ, injunction,  decree,  statute, rule or regulation applicable to TCA or any
of its  Subsidiaries,  or by which any of its properties or assets may be bound,
or (iii) result in a violation or breach of, or constitute  (with or without due
notice or lapse of time or both) a  default  under,  or  result in any  material
change in, or give rise to any right of termination, cancellation, acceleration,
redemption or repurchase  under,  any of the terms,  conditions or provisions of
any note, bond, mortgage,  indenture,  deed of trust, license,  lease, contract,
agreement  or other  instrument  or  obligation  to which TEC, TCA or any of its
Subsidiaries  is a party or by which any of them or any of their  properties  or
assets may be bound.  Schedule  3.3 of the TCA  Disclosure  Statement  lists all
consents,  waivers and approvals  required to be obtained in connection with the
consummation of the  transactions  contemplated by the TCA Agreements or the TEC


                                       11
<PAGE>

Agreements under any of TEC's, TCA's or any of their Subsidiaries' notes, bonds,
mortgages, indentures, deeds of trust, licenses or leases, contracts, agreements
or other instruments or obligations.

3.4 Board  Recommendation.  The board of directors of TCA has, at a meeting duly
held on  October  2,  2000:  (i)  approved  and  adopted  the Merger and the TCA
Agreements,  (ii)  determined that the Merger and the TCA Agreements are fair to
and in the best  interests  of the  stockholders  of TCA and (iii)  resolved  to
recommend  approval of the Merger and the TCA Agreements to the  stockholders of
TCA. The board of directors of TEC has, at a meeting duly held on September  27,
2000:  (i)  approved  and  adopted  the  Merger  and  the TEC  Agreements,  (ii)
determined  that the Merger and the TEC  Agreements  are fair to and in the best
interests of the  stockholders of TEC, and (iii) resolved that TEC shall vote or
cause to be voted all of its shares of TCA Common Stock and any such shares held
by any  Subsidiaries of TEC in favor of the Merger and the TEC Agreements at the
TCA  Special  Meeting,  including  any  adjournments  or  postponements  of that
meeting.

3.5 Fairness  Opinion.  TCA has received the opinion of J.P.  Morgan  Securities
Inc.  dated on or  before  the date of this  Agreement  to the  effect  that the
Exchange Ratio is fair to TCA's stockholders from a financial point of view, and
has provided a copy of that opinion to Thoratec.

3.6 Capitalization.

     (a) The authorized  capital stock of TCA consists of 100,000,000  shares of
TCA Common Stock. As of the date of this Agreement, there were 38,562,477 shares
of TCA Common Stock outstanding and 2,063,653 treasury shares. As of the date of
this Agreement,  there were 4 3/4% subordinated  convertible debentures due 2004
(the  "TCA  Debentures")  outstanding  in  the  aggregate  principal  amount  of
$53,300,000.  Neither the Merger nor any of the other transactions  contemplated
by this Agreement will accelerate the date that any principal or interest is due
under any TCA  Debentures,  will  constitute a default under any TCA Debentures,
will give rise to any rights of redemption respecting any TCA Debentures or will
confer any other rights respecting any TCA Debentures, except that the rights to
convert TCA  Debentures  into shares of TCA Common Stock shall become  rights to
convert TCA  Debentures  into shares of Thoratec  Common  Stock,  as adjusted to
reflect the Exchange Ratio.

     (b)  Except  for  the  TCA  Debentures,  there  are no  warrants,  options,
convertible  securities,  calls, rights,  stock appreciation rights,  preemptive
rights,  rights of first  refusal,  or agreements or  commitments  of any nature
obligating  TCA to issue,  deliver or sell, or cause to be issued,  delivered or
sold,  additional  shares of capital stock or other equity  interests of TCA, or


                                       12
<PAGE>

obligating  TCA to grant,  issue,  extend,  accelerate  the vesting of, or enter
into,  any such  warrant,  option,  convertible  security,  call,  right,  stock
appreciation  right,  preemptive  right,  right of first  refusal,  agreement or
commitment.  To the  knowledge  of TCA  and  TEC,  except  for  the  Shareholder
Agreement,   there  are  no  voting  trusts,  proxies  or  other  agreements  or
understandings with respect to the capital stock of TCA.

     (c) True and complete  copies of each TCA Stock Plan, the  Directors'  Plan
and the TCA Purchase Plan,  and of the forms of all  agreements and  instruments
relating to or issued under each thereof,  have been made available to Thoratec.
Such  agreements,  instruments,  and forms have not been  amended,  modified  or
supplemented,  and there are no  agreements to amend,  modify or supplement  any
such agreements, instruments or forms.

     (d)  Schedule  3.6(d)  of the  TCA  Disclosure  Statement  sets  forth  the
following  information with respect to each TCA Option:  the aggregate number of
shares issuable  thereunder,  the type of option, the grant date, the expiration
date, the exercise price and the vesting  schedule.  Each TCA Option was granted
in accordance with the terms of the TCA Stock Plan applicable thereto. The terms
of each of the TCA Stock Plans do not prohibit the assumption of the TCA Options
as provided in Section 2.2(a).  Schedule 3.6(d) of the TCA Disclosure  Statement
sets forth the following  information  with respect to the Directors'  Plan: the
name of each  director of TCA eligible to receive cash or TCA Common Stock under
the Directors'  Plan, the amount of cash and TCA Common Stock issuable as of the
date of this  Agreement to each such director and an estimate of such amounts as
of the Closing Date.  Under the terms of the Directors'  Plan,  each director of
TCA will cease to accrue any rights under the Directors'  Plan upon  resignation
of such director at the Effective Time.

3.7 SEC Filings.  TCA has filed with the Securities and Exchange Commission (the
"SEC") all  required  forms,  reports,  registration  statements  and  documents
required to be filed by it with the SEC (collectively,  all such forms, reports,
registration  statements and documents  filed after January 1, 1997 are referred
to herein as the "TCA SEC Reports").  All of the TCA SEC Reports  complied as to
form, when filed, in all material respects with the applicable provisions of the
Securities  Act of 1933,  as amended  (together  with the rules and  regulations
promulgated thereunder, the "Securities Act") and the Exchange Act. Accurate and
complete copies of the TCA SEC Reports have been made available to Thoratec.  As
of their  respective  dates,  the TCA SEC Reports  (including  all  exhibits and
schedules thereto and documents  incorporated by reference  therein) did not, at
the time they were filed (or, if amended or  superseded by a filing prior to the


                                       13
<PAGE>

date hereof,  then on the date of such filing) contain any untrue statement of a
material fact or omit to state a material fact required to be stated  therein or
necessary to make the statements  therein,  in light of the circumstances  under
which they were made,  not  misleading.  To the knowledge of TCA, no director or
officer of TCA has failed to comply with any filing  requirements  under Section
13 or Section 16(a) of the Exchange Act.

3.8  Financial  Statements.   Each  of  the  consolidated  financial  statements
(including,  in each case, any related notes  thereto)  contained in the TCA SEC
Reports (the "TCA Financial  Statements"),  (x) was prepared in accordance  with
generally accepted accounting  principles ("GAAP") applied on a consistent basis
throughout the periods involved (except as may be indicated in the notes thereto
or, in the case of unaudited interim financial  statements,  as may be permitted
by the SEC on Form 10-Q under the  Exchange  Act) and (y) fairly  presented  the
consolidated  financial  position of TCA and its  Subsidiaries  in all  material
respects as of the respective dates thereof and the consolidated  results of its
operations and cash flows for the periods  indicated,  consistent with the books
and records of TCA, except that the unaudited interim financial  statements were
or are subject to normal and recurring  year-end  adjustments which were not, or
are not expected to be,  material in amount.  The balance sheet of TCA contained
in TCA's Form 10-Q for the quarter ended June 30, 2000 (the "Reference Date") is
hereinafter referred to as the "TCA Balance Sheet."

3.9 Absence of Undisclosed Liabilities.  Neither TCA nor any of its Subsidiaries
has any liabilities (absolute,  accrued, contingent or otherwise) other than (i)
liabilities  included  in the TCA  Balance  Sheet and the  related  notes to the
financial  statements,  (ii)  normal or  recurring  liabilities  incurred in the
ordinary course of business consistent with past practice which, individually or
in the  aggregate,  are not and  would  not be  reasonably  likely to have a TCA
Material Adverse Effect, and (iii) liabilities under this Agreement.

3.10 Absence of Changes or Events.  Except as  contemplated  by this  Agreement,
since the  Reference  Date no TCA Material  Adverse  Effect has occurred and, in
addition,  TCA and its  Subsidiaries  have  not,  directly  or  indirectly:


     (a)  purchased,  otherwise  acquired,  or agreed to purchase  or  otherwise
acquire,  any shares of capital stock or any  indebtedness  of TCA or any of its
Subsidiaries (including,  without limitation, any TCA Debentures),  or declared,
set aside or paid any  dividend or  otherwise  made a  distribution  (whether in
cash,  stock,  debt or property or any combination  thereof) in respect of their
capital stock (other than dividends or other distributions payable solely to TCA
or a wholly-owned Subsidiary of TCA);

                                       14
<PAGE>

     (b) authorized for issuance, issued, sold, delivered, granted or issued any
options, warrants, calls, subscriptions or other rights for, or otherwise agreed
or committed to issue,  sell or deliver any shares of any class of capital stock
of TCA or its Subsidiaries or any securities convertible into or exchangeable or
exercisable for shares of any class of capital stock of TCA or its Subsidiaries,
other than  pursuant to and in accordance  with the TCA Stock Plans,  Directors'
Plan and TCA  Purchase  Plan other than as  disclosed on Schedule 3.6 to the TCA
Disclosure Statement;

     (c) (i) created or incurred any  indebtedness  for borrowed money exceeding
$250,000 in the aggregate, (ii) assumed, guaranteed, endorsed or otherwise as an
accommodation  become  responsible for the obligations of any other  individual,
firm or corporation, made any loans or advances to any other individual, firm or
corporation (including, without limitation, TEC or any Subsidiary of TEC that is
not TCA or a  Subsidiary  of TCA)  exceeding  $100,000 in the  aggregate,  (iii)
entered  into  any oral or  written  agreement,  commitment  or  transaction  or
incurred any liability involving, in any one case, in excess of $100,000;

     (d)  instituted any change in accounting  methods,  principles or practices
other than as required by GAAP or the rules and  regulations  promulgated by the
SEC and disclosed in the notes to the TCA Financial Statements;

     (e) revalued any assets,  including  without  limitation,  writing down the
value of  inventory  or writing  off notes or accounts  receivable  in excess of
amounts previously reserved as reflected in the TCA Balance Sheet;

     (f) suffered any damage,  destruction or loss, whether covered by insurance
or not, except for such as would not,  individually  or in the aggregate  exceed
$100,000;

     (g) (i) increased in any manner the  compensation  of any of its directors,
officers or, other than in the ordinary  course of business and consistent  with
past practice,  non-officer employees, (ii) granted any severance or termination
pay  to  any  Person;  (iii)  entered  into  any  oral  or  written  employment,
consulting,  indemnification or severance  agreement with any Person; (iv) other
than as  required  by law,  adopted,  become  obligated  under,  or amended  any
employee benefit plan, program or arrangement; or (v) repriced any TCA Options;

     (h) sold, transferred, leased, licensed, pledged, mortgaged, encumbered, or
otherwise  disposed of, or agreed to sell,  transfer,  lease,  license,  pledge,
mortgage, encumber, or otherwise dispose of, any material properties, (including


                                       15
<PAGE>

intangibles,  real, personal or mixed), it being understood that this clause (h)
does not extend to sales of inventory in the ordinary course of business;

     (i) amended its  Articles of  Organization,  bylaws,  or any other  charter
document,  or  effected  or been a party  to any  merger,  consolidation,  share
exchange,  business combination,  recapitalization,  reclassification of shares,
stock split, reverse stock split or similar transaction;

     (j) made any capital expenditure in any calendar month which, when added to
all other capital  expenditures made by or on behalf of TCA and its Subsidiaries
in such calendar month resulted in such capital expenditures  exceeding $150,000
in the aggregate;

     (k) paid,  discharged  or satisfied  any material  claims,  liabilities  or
obligations  (absolute,  accrued,  contingent  or  otherwise),  other  than  the
payment,  discharge or satisfaction of liabilities  (including accounts payable)
in the  ordinary  course of  business  and  consistent  with past  practice,  or
collected,  or  accelerated  the  collection  of, any  amounts  owed  (including
accounts  receivable)  other than their  collection  in the  ordinary  course of
business;

     (l) waived, released,  assigned,  settled or compromised any material claim
or litigation,  or commenced a lawsuit other than for the routine  collection of
bills;  or

     (m) agreed or proposed to do any of the things  described in the  preceding
clauses (a) through (l) other than as expressly  contemplated or provided for in
this  Agreement.  3.11  Capital  Stock of  Subsidiaries.  TCA is the  record and
beneficial  owner of all of the  outstanding  shares of  capital  stock or other
equity interests of each of its Subsidiaries.  All of such shares have been duly
authorized  and are  validly  issued,  fully  paid,  nonassessable  and  free of
preemptive  rights with  respect  thereto and are owned by TCA free and clear of
any claim,  lien or encumbrance of any kind with respect  thereto.  There are no
proxies or voting agreements with respect to such shares,  and there are not any
existing  options,  warrants,  calls,  subscriptions,  or other  rights or other
agreements or commitments  obligating TCA or any Subsidiaries to issue, transfer
or sell any shares of capital stock of any  Subsidiary  or any other  securities
convertible into,  exercisable for, or evidencing the right to subscribe for any
such shares.  TCA does not directly or indirectly own any equity interest in any
Person except the Subsidiaries.

                                       16
<PAGE>

3.12  Litigation.

     (a) There is no private or governmental claim, action, suit,  investigation
or  proceeding of any nature  ("Action")  pending or, to the knowledge of TCA or
TEC,  threatened in writing  against TCA or any of its  Subsidiaries,  or any of
their  respective  officers and  directors  (in their  capacities  as such),  or
involving  any  of  their  assets,  before  any  court,  Government  Entity,  or
arbitration  tribunal,  except for those Actions which,  individually  or in the
aggregate,  would not have a TCA  Material  Adverse  Effect.  There is no Action
pending or, to the knowledge of TCA,  threatened which in any manner challenges,
seeks to, or is reasonably likely to prevent,  enjoin, alter or delay any of the
transactions contemplated by the TCA Agreements or the TEC Agreements.

     (b) There is no outstanding judgment,  order, writ, injunction or decree of
any court,  Government Entity, or arbitration  tribunal in a proceeding to which
TCA, any Subsidiary of TCA, or any of their assets is or was a party or by which
TCA, any  Subsidiary  of TCA, or any of their assets is bound.  3.13  Insurance.
Schedule

3.13 of the TCA Disclosure  Statement lists all insurance  policies  (including,
without  limitation,  workers'  compensation  insurance  policies)  covering any
business,  properties,  assets or operations of TCA or any of its  Subsidiaries,
whether or not they are policies issued directly to TCA or any Subsidiary of TCA
(for  example,  because  they have been issued to or  procured by TEC),  and all
claims in excess of $50,000 made against or under any such policies with respect
to TCA or any Subsidiary of TCA (but not other insured  entities)  since January
1, 1997.  Neither TCA nor TEC has received notice of the  cancellation or threat
of cancellation of any of such policy.

3.14  Contracts and Commitments.

     (a) Schedule  3.14(a) of the TCA Disclosure  Statement  contains a complete
and accurate list of all agreements,  understanding  and  arrangements,  whether
written,  oral or established  through common  practice,  between TCA or any TCA
Subsidiary and any Person that directly or indirectly  beneficially  owns, or is
controlled by or under common  control with any Person that  beneficially  owns,
more than five  percent of the  outstanding  TCA Common  Stock (the "TCA Related
Party Agreements").  True and correct copies of all TCA Related Party Agreements
have been  provided to Thoratec.  To the  knowledge of TCA, the terms of the TCA
Related Party Agreements are no less favorable to TCA and its Subsidiaries  than
could be obtained from a third party in an arms-length transaction.

                                       17
<PAGE>

     (b)  Except  as  filed   (including  by   incorporation   by  reference  to
earlier-filed  documents)  as an  exhibit  to the TCA SEC  Reports  filed  after
January  1,  2000 or as  identified  on  Schedule  3.14  to the  TCA  Disclosure
Statement  (collectively  the  "TCA  Contracts",  it being  understood  that the
failure to identify an  agreement,  etc. on that schedule that is required to be
identified on that schedule shall  nevertheless be considered a "TCA Contract"),
neither  TCA nor any of its  Subsidiaries  is a party to or bound by any oral or
written  contract,  obligation or commitment of any type in any of the following
categories:

          (i)  agreements  with any employees or  consultants  of TCA or any TCA
     Subsidiary respecting their employment, consulting, salary, wages, bonuses,
     incentive compensation,  severance or retention pay, or other compensation,
     except  for  those   employees   or   consultants   whose  annual  rate  of
     compensation,  including potential bonuses and incentive  compensation,  is
     less than $100,000;

          (ii)  agreements  or plans under which  benefits  will be increased or
     accelerated by the occurrence of any of the  transactions  contemplated  by
     the TCA  Agreements  or the TEC  Agreements or under which the value of the
     benefits  will  be  calculated  on the  basis  of  any of the  transactions
     contemplated by such agreements;

          (iii) agreements, contracts or commitments currently in force relating
     to the  disposition  or  acquisition  of assets  other than in the ordinary
     course  of  business,   or  relating  to  an  ownership   interest  in  any
     corporation,  partnership, joint venture or other business enterprise;


          (iv)  agreements,  contracts or commitments for the purchase of goods,
     supplies or equipment:  (A) which are with sole or single source  suppliers
     or (B) for a cost, for any one such agreement,  contract and commitment, in
     excess of $250,000 and which,  in the case of this clause (B),  provide for
     purchase prices  substantially  greater than those presently prevailing for
     such materials, supplies or equipment;

          (v) guarantees or other  agreements,  contracts or  commitments  under
     which TCA or any of its  Subsidiaries is absolutely or contingently  liable
     for (A) the  performance  of any other Person (other than TCA or any of its
     Subsidiaries),  or (B) the whole or any part of the indebtedness or payment
     obligations of any other Person (other than TCA or its Subsidiaries);

          (vi)  powers of  attorney  authorizing  the  incurrence  of a material
     obligation on the part of TCA or any of its Subsidiaries;

                                       18
<PAGE>

          (vii) agreements, contracts or commitments which limit or restrict (A)
     where TCA or any of its Subsidiaries may conduct business,  (B) the type or
     lines of business  (current or future) in which they may engage, or (C) any
     acquisition  of assets or stock  (tangible or  intangible) by TCA or any of
     its Subsidiaries;

          (viii) agreements,  contracts or commitments  containing any agreement
     with respect to a change of control of TCA or any of its Subsidiaries;

          (ix) agreements, contracts or commitments for the borrowing or lending
     of money,  or the  availability of credit (except credit extended by TCA or
     any of its Subsidiaries to customers in the ordinary course of business and
     consistent  with past  practice);

          (x) any hedging,  option,  derivative or other similar transaction and
     any foreign exchange position or contract for the exchange of currency;  or

          (xi) any  joint  marketing  or  joint  development  agreement,  or any
     license or  distribution  agreement  relating to any TCA product or planned
     product.

     (c) Neither TCA nor any of its  Subsidiaries,  nor to TCA's  knowledge  any
other party to any TCA Contract, has materially breached,  violated or defaulted
under, or received notice that it has breached, violated or defaulted under (nor
does there  exist any  condition  under  which,  with the passage of time or the
giving of notice or both,  could  reasonably  be  expected  to cause a  material
breach, violation or default under), any TCA Contract.

     (d) Each TCA Contract is a valid,  binding and  enforceable  obligation  of
TCA, and to TCA's knowledge of the other party or parties thereto, in accordance
with its terms,  and in full force and effect,  except for any TCA Related Party
Agreements that will be terminated as of the Effective Time and except where the
failure to be valid, binding, enforceable and in full force and effect would not
have a TCA Material Adverse Effect and to the extent  enforcement may be limited
by applicable  bankruptcy,  insolvency,  moratorium or other laws  affecting the
enforcement  of creditors'  rights or by general  principles  of equity.

     (e) An  accurate  and  complete  copy of each TCA  Contract  has been  made
available to Thoratec.

     (f) The  obligations  to pay  transaction  bonuses  or  other  compensation
occasioned  by the Merger to the persons  listed on Schedule  3.14(f) to the TCA
Disclosure  Statement are  obligations of TEC and not  obligations of TCA or any
Subsidiary of TCA.


                                       19
<PAGE>

3.15 Labor Matters; Employment and Labor Contracts.

     (a) None of TCA or any of its Subsidiaries is a party to any union contract
or other collective  bargaining  agreement,  nor to the knowledge of TCA, TEC or
any of their  Subsidiaries  are there any activities or proceedings of any labor
union to organize any of its employees.  Each of TCA and its  Subsidiaries is in
compliance with all applicable (i) laws,  regulations and agreements  respecting
employment  and employment  practices,  (ii) terms and conditions of employment,
and (iii) occupational health and safety requirements, except for those failures
to comply which, individually or in the aggregate, would not have a TCA Material
Adverse Effect.

     (b) There is no labor  strike,  slowdown or stoppage  pending (or any labor
strike  or  stoppage  threatened)  against  TCA or any of its  Subsidiaries.  No
petition  for  certification  has been filed and is pending  before the National
Labor  Relations  Board  with  respect  to  any  employees  of TCA or any of its
Subsidiaries.  Neither TCA nor any of its Subsidiaries has any obligations under
the  Consolidated  Omnibus  Budget   Reconciliation  Act  of  1985,  as  amended
("COBRA"),  with  respect to any former  employees or  qualifying  beneficiaries
thereunder,  except for obligations that would not have,  individually or in the
aggregate, a TCA Material Adverse Effect. There are no controversies pending or,
to the knowledge of TEC, TCA or any of its Subsidiaries, threatened, between TCA
or  any  of its  Subsidiaries  and  any of  their  respective  employees,  which
controversies  would have,  individually  or in the  aggregate,  a TCA  Material
Adverse  Effect.

3.16 Compliance with Laws.  Neither TCA nor any of its Subsidiaries has violated
or  failed  to comply  with any  statute,  law,  ordinance,  rule or  regulation
(including  without  limitation  relating  to the  export  or import of goods or
technology)  of any  Government  Entity,  except  where any such  violations  or
failures  to comply  would not,  individually  or in the  aggregate,  have a TCA
Material Adverse Effect. TCA and its Subsidiaries have all permits, licenses and
franchises from Government  Entities required to conduct their businesses as now
being conducted and as proposed to be conducted,  except for those,  the absence
of which  would  not,  individually  or in the  aggregate,  have a TCA  Material
Adverse Effect.

3.17 Intellectual Property Rights.

     (a) TCA and its  Subsidiaries own or have the right to use all intellectual
property used to conduct their respective businesses (such intellectual property
and the rights thereto are collectively  referred to as the "TCA IP Rights"). No


                                       20
<PAGE>

royalties  or  other  payments  are  payable  to  any  Person  with  respect  to
commercialization of any products presently sold by TCA or its Subsidiaries.

     (b) The execution,  delivery and  performance of the TCA Agreements and the
consummation of the transactions  contemplated hereby will not: (i) constitute a
material breach of any instrument or agreement governing any TCA IP Rights, (ii)
cause the  modification  of any terms of any licenses or agreements  relating to
any TCA IP  Rights  including,  but not  limited  to,  the  modification  of the
effective  rate of any  royalties  or other  payments  provided  for in any such
license or agreement,  (iii) cause the  forfeiture or  termination of any TCA IP
Rights,  (iv) give rise to a right of  forfeiture or  termination  of any TCA IP
Rights  or (v)  materially  impair  the right of TCA,  Thoratec  or any of their
Subsidiaries to use, sell or license any TCA IP Rights or portion  thereof.

     (c) Neither the manufacture,  marketing,  license,  sale or intended use of
any product or technology currently licensed or sold or under development by TCA
or any of its Subsidiaries:  (i) violates in any material respect any license or
agreement  between TCA or any of its Subsidiaries and any third party or (ii) to
the  knowledge of TCA,  infringes  in any material  respect any patents or other
intellectual  property rights of any other party. There is no pending or, to the
knowledge  of TCA,  threatened  claim or  litigation  contesting  the  validity,
ownership  or right to use,  sell,  license or dispose of any TCA IP Rights,  or
asserting  that  any  TCA IP  Rights  or the  proposed  use,  sale,  license  or
disposition  thereof,  or the  manufacture,  use or sale  of any  TCA  products,
conflicts  or will  conflict  with the  rights of any other  party.

     (d) TCA has  provided to Thoratec a worldwide  list of all  patents,  trade
names,  trademarks and service marks,  and applications for any of the foregoing
owned or possessed by TCA or any of its Subsidiaries.

     (e) TCA has provided to Thoratec a true and  complete  copy of its standard
form of employee  confidentiality  agreement and taken  commercially  reasonable
steps to ensure that all key employees and scientific  employees (whether or not
key) of TCA and its Subsidiaries have executed such an agreement. All scientific
consultants  with access to proprietary  information of TCA or any Subsidiary of
TCA have executed  appropriate  non-disclosure  agreements  with respect to such
proprietary  information.

     (f) Neither TCA nor any of its Subsidiaries is aware that any of its key or
scientific employees or scientific  consultants is obligated under any contract,
covenant or other  agreement  or  commitment  of any  nature,  or subject to any
judgment,  decree or order of any court or  administrative  agency,  that  would
interfere  with the use of such  employee's  or  consultant's  best  efforts  to
promote the interests of TCA and its  Subsidiaries  or that would  conflict with


                                       21
<PAGE>

the  business  of  TCA or any of its  Subsidiaries  as  presently  conducted  or
proposed to be conducted.  Neither TCA nor any of its  Subsidiaries  has entered
into any agreement to indemnify  any other person,  including but not limited to
any employee or consultant of TCA or any of its Subsidiaries, against any charge
of infringement,  misappropriation or misuse of any intellectual property, other
than  indemnification  provisions  contained  in  purchase  orders  or  customer
agreements  arising in the ordinary  course of business.  All current and former
key or scientific  employees and scientific  consultants of any of TCA or any of
its Subsidiaries who in TCA's reasonable business judgment were appropriate have
signed valid and  enforceable  written  assignments to TCA or one or more of its
Subsidiaries of any and all rights or claims in any  intellectual  property that
any such employee or consultant  has or may have by reason of any  contribution,
participation or other role in the development,  conception, creation, reduction
to practice or authorship of any invention,  innovation,  development or work of
authorship  or any other  intellectual  property that is used in the business of
TCA or any of its  Subsidiaries,  and TCA and its  Subsidiaries  possess  signed
copies of all such written  assignments by such employees and  consultants.

     (g)  There  are  no  existing  licenses  between  International  Technidyne
Corporation  ("ITC"),  on the one hand, and TEC or any Subsidiary of TEC, on the
other hand, respecting any intellectual property owned or used by ITC.

3.18 Taxes.

     (a) For purposes of this Agreement,  "Tax" or "Taxes" refers to any and all
federal,  state,  local and foreign taxes,  assessments  and other  governmental
charges, duties,  impositions and liabilities relating to taxes, including taxes
based upon or  measured  by gross  receipts,  income,  profits,  sales,  use and
occupation,  and value  added,  ad valorem,  transfer,  franchise,  withholding,
payroll,  recapture,  employment,  excise and property taxes,  together with all
interest,  penalties and additions  imposed with respect to such amounts and any
obligations  under any  agreements  or  arrangements  with any other person with
respect to such amounts and  including  any liability for taxes of a predecessor
entity. For purposes of this Agreement,  "Tax Return" or "Tax Returns" refers to
all  federal,  state and  local  and  foreign  returns,  estimates,  information
statements and reports  relating to Taxes,  in each case filed or required to be
filed with a Government Entity.

     (b) TCA and each of its Subsidiaries have filed all Tax Returns required to
have  been  filed by  them,  and have  paid  (or TCA has paid on  behalf  of its
Subsidiaries),  all Taxes  required to have been shown on such Tax Returns.  The
most recent  financial  statements  contained in the TCA SEC Reports  reflect an
adequate  accrual (which accruals were  established in accordance with GAAP) for
the payment of all Taxes payable by TCA and its Subsidiaries,  as of the date of


                                       22
<PAGE>

such financial  statements.  Except as reasonably  would not have a TCA Material
Adverse Effect,  no deficiencies  for any Taxes have been proposed,  asserted or
assessed  against  TCA or any of its  Subsidiaries.  Neither  TCA nor any of its
Subsidiaries  has filed for any  extension  of time to file any Tax Return which
has not since  been  filed.  Neither  TCA nor any of its  Subsidiaries  has been
included in a consolidated  or combined Tax Return that has included TEC for any
period not now closed under all applicable statutes of limitations.

     (c) Neither  TCA nor any of its  Subsidiaries  is a party to any  contract,
agreement,   plan  or  arrangement  including,  but  not  limited  to,  the  TCA
Agreements,  covering  any  employee  or  former  employee  of TCA or any of its
Subsidiaries  that: (i) could give rise to the payment of any amounts that would
constitute excess parachute  payments within the meaning of Sections 280G of the
Code with  respect to the change in ownership or control that may occur upon the
consummation of the Merger, or (ii) could give rise to the payment of any amount
that would constitute a parachute payment within the meaning of Sections 280G of
the Code with  respect to any change in  ownership  or control of TCA  occurring
after the Closing Date.  During the taxable year ending on the Closing Date, TCA
and its Subsidiaries have not become obligated to make any payment the deduction
of which would be disallowed pursuant to Section 162(m) of the Code.

     (d) None of TCA and its Subsidiaries has filed any consent  agreement under
Section 341(f) of the Code or agreed to have Section 341(f)(2) of the Code apply
to any disposition of a Subsection (f) asset (as defined in Section 341(f)(4) of
the Code) owned by TCA or any of its Subsidiaries.

     (e) None of TCA and its  Subsidiaries:  (i) has received any notice that it
is being  audited  by any  taxing  authority,  (ii) has  granted  any  presently
operative waiver of any statute of limitations with respect to, or any extension
of a period for the  assessment of, any Tax, (iii) has permitted any Tax lien to
be placed on any asset of TCA or any of its Subsidiaries, except with respect to
Taxes not yet due and payable or (iv) has  availed  itself of any Tax amnesty or
similar relief in any taxing jurisdiction.

     (f) None of TCA and its  Subsidiaries is aware of any reason why the Merger
will fail to qualify as a reorganization  under the provisions of Section 368(a)
of the Code.

     (g) TCA has not been a United  States  real  property  holding  corporation
within the meaning of Section  897 of the Code at any time after June 30,  1995.

                                       23
<PAGE>


     (h) Neither TCA nor any of its Subsidiaries has any liability for the Taxes
of any Person  other than  itself,  TCA or another  present  Subsidiary  of TCA.
Neither  TCA nor any of its  Subsidiaries  is a party to any tax  sharing or tax
indemnity agreement.

3.19 Employee Benefit Plans; ERISA.

     (a) There are no  "employee  pension  benefit  plans" as defined in Section
3(2)  of the  Employee  Retirement  Income  Security  Act of  1974,  as  amended
("ERISA") ("TCA Pension  Plans"),  "welfare benefit plans" as defined in Section
3(1) of ERISA ("TCA Welfare Plans"),  or stock bonus,  stock option,  restricted
stock, stock  appreciation  right, stock purchase,  bonus,  incentive,  deferred
compensation,  severance,  holiday,  or vacation  plans,  or any other  employee
benefit  plan,  program,  policy or  arrangement  covering  employees (or former
employees)   employed  in  the  United  States  that  either  is  maintained  or
contributed to by TCA or any TCA ERISA Affiliate (as hereinafter  defined) or to
which TCA or any TCA ERISA  Affiliate is obligated to make payments or otherwise
may have any liability  (collectively,  the "TCA Employee  Benefit  Plans") with
respect to employees or former employees of TCA or any of its  Subsidiaries,  or
any TCA ERISA Affiliate.  For purposes of this Agreement,  "TCA ERISA Affiliate"
means any person (as  defined  in Section  3(9) of ERISA)  that is or has been a
member of any group of persons  described in Section 414(b),  (c), (m) or (o) of
the Code, including, without limitation, TCA or a Subsidiary.

     (b) TCA and each of its Subsidiaries, and each of the TCA Pension Plans and
TCA  Welfare  Plans,  are  in  compliance  in all  material  respects  with  the
applicable  provisions of ERISA,  the Code and other  applicable  laws.

     (c) All  contributions  to, and payments  from, the TCA Pension Plans which
are  required to have been made in  accordance  with the TCA Pension  Plans have
been timely made.

     (d) All TCA Pension Plans intended to qualify under Section 401 of the Code
have been determined by the Internal Revenue Service ("IRS") to be so qualified,
and no event has occurred  and no  condition  exists with respect to the form or
operation  of  any  TCA  Pension  Plan  which  would  cause  the  loss  of  such
qualification or the imposition of any material liability,  penalty or tax under
ERISA or the Code.

     (e)  There  are no (i)  investigations  pending  by any  Government  Entity
involving  any TCA Pension Plan or TCA Welfare  Plan, or (ii) pending or, to the
knowledge of TCA,  threatened  claims (other than routine  claims for benefits),


                                       24
<PAGE>

suits or proceedings  against any TCA Pension Plan or TCA Welfare Plan,  against
the assets of any of the trusts  under any TCA Pension  Plan or TCA Welfare Plan
or against  any  fiduciary  of any TCA  Pension  Plan or TCA  Welfare  Plan with
respect  to the  operation  of such plan or  asserting  any  rights or claims to
benefits under any TCA Pension Plan or TCA Welfare Plan or against the assets of
any trust under any such plan, except for those which would not, individually or
in the  aggregate,  give rise to any  liability  which would have a TCA Material
Adverse Effect.  To the best of TCA's knowledge,  there are no facts which would
give rise to any liability  under this Section  3.19(e),  except for those which
would not,  individually  or in the  aggregate,  either  impair TCA's ability to
consummate the Merger or any of the other  transactions  contemplated  hereby or
have a TCA Material Adverse Effect.

     (f) None of TCA, any of its  Subsidiaries or any employee of the foregoing,
nor any trustee, administrator, other fiduciary or any other "party in interest"
or  "disqualified  person"  with  respect to any TCA Pension Plan or TCA Welfare
Plan,  has  engaged in a  "prohibited  transaction"  (as that term is defined in
Section 4975 of the Code or Section 406 of ERISA)  other than such  transactions
that would not, individually or in the aggregate, either impair TCA's ability to
consummate the Merger or any of the other  transactions  contemplated  hereby or
have a TCA Material Adverse Effect.

     (g)  None of TCA,  any of its  Subsidiaries,  or any  TCA  ERISA  Affiliate
maintains or contributes  to, nor has it ever  maintained or contributed to, any
pension  plan subject to Title IV of ERISA or Section 412 of the Code or Section
302 of ERISA.  (h) None of TCA, any Subsidiary of TCA or any TCA ERISA Affiliate
has incurred any  material  liability  under Title IV of ERISA that has not been
satisfied  in full.

     (i) None of TCA, any of its Subsidiaries or any TCA ERISA Affiliate has any
material  liability  (including any contingent  liability  under Section 4204 of
ERISA) with  respect to any  multiemployer  plan,  within the meaning of Section
3(37) of ERISA,  covering employees (or former employees) employed in the United
States.

     (j) With respect to each of the TCA Employee Benefit Plans,  true,  correct
and  complete  copies of the  following  documents  have been made  available to
Thoratec:  (i) the plan  document  and any related  trust  agreement,  including
amendments  thereto,  (ii) any  current  summary  plan  descriptions  and  other
material  communications  to participants  relating to the TCA Employee  Benefit
Plans, (iii) the three most recent Forms 5500, if applicable,  and (iv) the most
recent IRS  determination  letter,  if  applicable.



                                       25
<PAGE>

     (k) None of the TCA  Welfare  Plans  provides  for  continuing  benefits or
coverage for any  participant  or any  beneficiary  of a  participant  following
termination of employment,  except as may be required under COBRA,  or except at
the expense of the participant or the participant's beneficiary. TCA and each of
its  Subsidiaries  which  maintain a "group  health  plan" within the meaning of
Section  5000(b)(1) of the Code have  complied with the notice and  continuation
requirements of Section 4980B of the Code,  COBRA, Part 6 of Subtitle B of Title
I of ERISA and the  regulations  thereunder  except  where the failure to comply
would not,  individually  or in the  aggregate,  either  impair TCA's ability to
consummate the Merger or any other transaction contemplated hereby or have a TCA
Material  Adverse  Effect.

     (l) No  liability  under any TCA Pension  Plan or TCA Welfare Plan has been
funded  nor has any  such  obligation  been  satisfied  with the  purchase  of a
contract  from an insurance  company as to which TCA or any of its  Subsidiaries
has  received  notice  that such  insurance  company is in  rehabilitation  or a
comparable proceeding.

     (m) The consummation of the transactions contemplated by the TCA Agreements
will not result in an  increase  in the amount of  compensation  or  benefits or
accelerate  the  vesting or timing of payment of any  benefits  or  compensation
payable to or in respect of any employee of TCA or any of its Subsidiaries.

     (n) Schedule 3.19(n) of the TCA Disclosure Statement lists each TCA Foreign
Plan (as hereinafter defined).  TCA and each of its Subsidiaries and each of the
TCA Foreign  Plans are in  compliance  with  applicable  laws,  and all required
contributions have been made to the TCA Foreign Plans,  except where the failure
to comply or make  contributions  would not,  individually  or in the aggregate,
either impair TCA's ability to  consummate  the Merger or any other  transaction
contemplated  hereby  or have a TCA  Material  Adverse  Effect.  Each of the TCA
Foreign Plans that is a funded  defined  benefit  pension plan has a fair market
value of plan assets that is greater than the plan's liabilities,  as determined
in accordance  with  applicable  laws. For purposes  hereof,  "TCA Foreign Plan"
means  any  plan,  program,  policy,  arrangement  or  agreement  maintained  or
contributed to by, or entered into with,  TCA or any Subsidiary  with respect to
any employees (or former  employees)  employed  outside the United States to the
extent the  benefits  provided  thereunder  are not  mandated by the laws of the
applicable foreign jurisdiction.

     (o) Each of the TCA Employee Benefit Plans and the TCA Foreign Plans can be
terminated by TCA within 30 days following the Effective Time in accordance with
the terms of such Plan and applicable law,  without any additional  contribution
to such TCA  Employee  Benefit  Plan or TCA  Foreign  Plan or the payment of any


                                       26
<PAGE>

additional  compensation or amount or the additional  vesting or acceleration of
any vesting  provided  under the TCA Employee  Benefit Plan or TCA Foreign Plan.
3.20 Environmental Matters.

     (a) For purposes of this Agreement:

          (i) "TCA Contractor" means any Person with which TCA or any Subsidiary
     formerly or presently  has any  agreement or  arrangement  (whether oral or
     written) under which such Person has or had physical possession of, and was
     or is  obligated  to develop,  test,  process,  manufacture  or produce any
     product or substance on behalf of TCA or any Subsidiary.

          (ii)  "Environment"  means  any land  including,  without  limitation,
     surface land and sub-surface strata, seabed or river bed, ecosystem and any
     water (including,  without limitation,  coastal and inland waters,  surface
     waters  and  ground  waters  and  water  in  drains  and  sewers)  and  air
     (including,  without  limitation,  air within buildings),  other natural or
     manmade structures above or below ground, and natural resources.

          (iii)  "Environmental  Law"  means  any  law or  regulation,  and  any
     judicial or administrative interpretation thereof, in each case relating to
     the  Environment  or harm to or the  protection of human  health,  animals,
     plants or  ecosystems,  including,  without  limitation,  laws  relating to
     public and workers health and safety, emissions,  discharges or releases of
     chemicals  or  any  other   pollutants  or   contaminants   or  industrial,
     radioactive, dangerous, toxic or hazardous substances or wastes (whether in
     solid or liquid form or in the form of a gas or vapor and  including  noise
     and  genetically  modified  organisms)  into the  Environment  or otherwise
     relating  to  the   manufacture   processing   use,   treatment,   storage,
     distribution,  disposal  transport  or  handling of  substances  or wastes.
     Environmental   Laws  include,   without   limitation,   the  Comprehensive
     Environmental   Response,   Compensation  and  Liability  Act,  as  amended
     ("CERCLA"),  the Resource  Conservation  and  Recovery Act 42 USC,  6901 et
     seq., the Hazardous Materials  Transportation Act 49 USC, 6901 et seq., the
     Clean Water Act 33, 1251 et seq., the Toxic Substances  Control Act 15 USC,
     2601 et seq.,  the Clean Air Act 42 USC,  7401 et seq.,  the Safe  Drinking
     Water Act 42 USC, 300f et seq., the Atomic Energy Act 42 USC, 2201 et seq.,
     the Federal Food Drug and Cosmetic Act 21 USC, 136 et seq., and the Federal
     Food Drug and Cosmetic Act 21 USC, 301 et seq., and equivalent statutes and
     other  laws in states  and other  jurisdictions  of the  United  States and
     countries other than the United States.

                                       27
<PAGE>

          (iv)  "Environmental  Permit"  means  any  permit,  license,  consent,
     approval, certificate, qualification, specification, registration and other
     authorization,   and  the  filing  of  all   notifications,   reports   and
     assessments, required by any federal, state, local or foreign government or
     regulatory entity pursuant to any Environmental Law.

          (v)  "Hazardous  Material"  means  any  pollutant,   contaminant,   or
     hazardous,  toxic,  medical,  biohazardous,  infectious or dangerous waste,
     substance,  gas, constituent or material,  defined or regulated as such in,
     or for purposes of, any Environmental Law,  including,  without limitation,
     any asbestos, petroleum, oil (including crude oil or any fraction thereof),
     radioactive substance,  polychlorinated biphenyls,  toxin, chemical, virus,
     infectious  disease or disease causing agent, and any other substances that
     can give rise to liability under any Environmental Law.

     (b) Except for such cases that, individually or in the aggregate,  have not
and would not have a TCA Material Adverse Effect:

          (i)  Each of TCA  and its  Subsidiaries  possesses  all  Environmental
     Permits required under applicable Environmental Laws to conduct its current
     business and to use and occupy the TCA Real Property (as defined below) for
     its  current  business.  All  Environmental  Permits  are in full force and
     effect and TCA and each of its  Subsidiaries  are,  and to TCA's  knowledge
     have at all times been, in compliance with such Environmental Permits.

          (ii)  There  are  no  facts  or  circumstances   indicating  that  any
     Environmental  Permit possessed by TCA or any of its Subsidiaries  would or
     might be revoked,  suspended,  canceled or not renewed, and all appropriate
     necessary  action  in  connection  with the  renewal  or  extension  of all
     Environmental  Permits possessed by TCA or any its Subsidiaries relating to
     the current business and the TCA Real Property has been taken.

          (iii)  The  execution  and  delivery  of the  TCA  Agreements  and the
     consummation by TCA of the Merger and the other  transactions  contemplated
     hereby and the exercise by Thoratec and the Surviving Corporation of rights
     to own and operate the  business  of TCA and its  Subsidiaries  and use and
     occupy  the TCA Real  Property  and  carry  on its  business  as  presently
     conducted  will not affect the  validity  or require  the  transfer  of any
     Environmental  Permits held by TCA or any of its  Subsidiaries and will not
     require any  notification,  disclosure,  registration,  reporting,  filing,
     investigation or remediation under any Environmental Law.



                                       28
<PAGE>

          (iv) TCA and each of its  Subsidiaries  and, to the  knowledge of TCA,
     all previous owners, lessees,  operators and occupants of the real property
     now  or  previously  owned,  leased  or  occupied  by  TCA  or  any  of its
     Subsidiaries (the "TCA Real Property"),  are in compliance with, and within
     the period of all applicable statutes of limitation, have complied with all
     applicable  Environmental  Laws and have not received written notice of any
     liability  under  any  Environmental  Law,  and  neither  TCA or any of its
     Subsidiaries  nor any portion of the TCA Real  Property is in  violation of
     any Environmental Law.

          (v)  There is no  civil,  criminal  or  administrative  action,  suit,
     demand,  claim,  complaint,  hearing,  notice of violation,  investigation,
     notice or demand letter,  proceeding or request for information  pending or
     any  liability  (whether  actual  or  contingent)  to  make  good,  repair,
     reinstate  or clean up any of the TCA Real  Property  or any real  property
     previously  owned,  leased,   occupied  or  used  by  TCA  or  any  of  its
     Subsidiaries.

          (vi) There has not been any disposal,  spill, discharge, or release of
     any Hazardous  Material  generated,  used, owned,  stored, or controlled by
     TCA, any of its Subsidiaries,  or respective  predecessors in interest, on,
     at, or under any TCA Real Property, or by any TCA Contractor, and there are
     no Hazardous Materials located in, at, on, or under, or in the vicinity of,
     any such facility or property,  or at any other location,  in any such case
     that  could  reasonably  be  expected  to require  investigation,  removal,
     remedial, or corrective action by TCA or any of its Subsidiaries.

          (vii) (A) Other than cleaning and office supplies normally used in the
     operation of an office, Hazardous Materials have not been generated,  used,
     treated,  handled or stored on, or  transported  to or from, or released on
     any TCA Real Property or, any property adjoining any TCA Real Property; (B)
     TCA and its  Subsidiaries  have  disposed  of all wastes,  including  those
     wastes containing  Hazardous  Materials,  in compliance with all applicable
     Environmental Law and Environmental Permits; and (C) neither TCA nor any of
     its Subsidiaries has transported or arranged for the  transportation of any
     Hazardous  Materials to any location that is listed or proposed for listing
     on the  National  Priorities  List  under  CERCLA or on the  CERCLIS or any
     analogous   state  or  country   list  or  which  is  the  subject  of  any
     environmental  claim.

          (viii) There has not been any underground or above ground storage tank
     or  other  underground   storage  receptacle  or  related  piping,  or  any
     impoundment or other disposal area containing  Hazardous  Materials located
     on any TCA Real Property, and no asbestos or polychlorinated biphenyls have
     been used or  disposed  of, or have been  located  at, on, or under any TCA
     Real  Property.

                                       29
<PAGE>

          (ix) TCA and its Subsidiaries  have taken all actions  necessary under
     applicable  requirements of  Environmental  Law to register any products or
     materials  required to be registered by TCA or any of its  Subsidiaries (or
     any  of  their  respective  agents)  thereunder.

     (c)  After a  reasonable  investigation  made by TCA and TEC,  TCA has made
available to Thoratec all records and files, including,  but not limited to, all
assessments, reports, studies, audits, analyses, tests and data in possession of
TEC, TCA and its Subsidiaries concerning the existence of Hazardous Materials at
any TCA Real Property or concerning compliance by TCA and its Subsidiaries with,
or liability under, any Environmental Law.

3.21 Officer's Certificate as to Tax Matters. TCA knows of no reason why it will
be unable to deliver to Heller  Ehrman  White & McAuliffe  LLP and Hale and Dorr
LLP, at the  Closing,  an  officer's  certificate  in the form and  substance of
Exhibit  B to this  Agreement.  TCA  shall use its best  efforts  to obtain  and
deliver that  certificate to both of those law firms.  (There is no Exhibit A to
this Agreement.)

3.22 Affiliates.  TCA has delivered to Thoratec in accordance with Section 5.9 a
list  identifying  all  persons  who,  to TCA's  knowledge,  may be deemed to be
"affiliates"  of TCA for  purposes of Rule 145 under the  Securities  Act.

3.23 Finders or Brokers.  Except for J.P. Morgan  Securities Inc. and The Beacon
Group Capital Services, LLC, whose fees have been disclosed to Thoratec, none of
TEC,  TCA or any of their  Subsidiaries  has  employed  any  investment  banker,
broker,  finder  or  intermediary  in  connection  with any of the  transactions
contemplated hereby who might be entitled to a fee or commission relating to the
Merger  or  any  other   transaction   contemplated  by  this  Agreement.

3.24 Registration Statement; Joint Proxy  Statement/Prospectus.  The information
to be supplied by TCA in writing for inclusion or  incorporation by reference in
the Registration  Statement on Form S-4 registering the Thoratec Common Stock to
be issued in the Merger (the "Registration  Statement") as it relates to TCA, at
the time the Registration  Statement is declared effective by the SEC, shall not
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated  therein or necessary in order to make the statements
therein not  misleading.  The  information  to be supplied by TCA in writing for
inclusion in the joint proxy statement/prospectus to be sent to the stockholders
of TCA in connection  with the TCA Special  Meeting and to the  shareholders  of
Thoratec in  connection  with the  Thoratec  Special  Meeting  (such joint proxy
statement/prospectus,  as amended and supplemented, is referred to as the "Joint


                                       30
<PAGE>

Proxy  Statement/Prospectus"),  at the date the Joint Proxy Statement/Prospectus
is first mailed to stockholders,  at the time of the TCA Special Meeting and the
Thoratec Special Meeting, and at the Effective Time shall not contain any untrue
statement of a material  fact or omit to state any material  fact required to be
stated therein or necessary in order to make the statements therein, in light of
the  circumstances  under which they were made, not misleading.  If, at any time
prior  to the  Effective  Time,  any  event  with  respect  to TCA or any of its
Subsidiaries  shall occur which is required to be  described  in the Joint Proxy
Statement/Prospectus,  such event shall be so  described,  and an  amendment  or
supplement  shall  be  promptly  filed  with the SEC and,  as  required  by law,
disseminated to the stockholders of TCA, Thoratec or both, as appropriate.

3.25 Title to and Condition of Property.  TCA and its Subsidiaries have good and
valid title to all of their respective  properties,  interests in properties and
assets, real and personal,  reflected in the TCA Balance Sheet or acquired after
the Reference Date, and have valid leasehold  interests in all leased properties
and  assets,  in each  case  free and clear of all  mortgages,  liens,  pledges,
charges or encumbrances  of any kind or character,  except (i) liens for current
taxes not yet due and  payable,  (ii)  such  imperfections  of title,  liens and
easements as do not and will not  materially  detract from or interfere with the
use  of the  properties  subject  thereto  or  affected  thereby,  or  otherwise
materially impair business operations involving such properties,  or (iii) liens
securing  debt  reflected  on the TCA Balance  Sheet.  Schedule  3.25 of the TCA
Disclosure  Statement identifies each parcel of real property owned or leased by
TCA or any of its Subsidiaries.  TCA's and its  Subsidiaries'  real and tangible
personal  property  has been  maintained  in  accordance  with  normal  industry
practice,  is in good operating condition and repair (subject to normal wear and
tear),  and is suitable for the purposes for which it is used.

3.26 No Existing  Discussions.  As of the date  hereof,  none of TEC, TCA or any
their representatives is engaged,  directly or indirectly, in any discussions or
negotiations with any other Person relating to any TCA Acquisition  Proposal (as
defined in Section 5.2(c)).

3.27 Food and Drug Administration Matters.

     (a) For purposes of this Agreement:

          (i) "FDA"  means the United  States Food and Drug  Administration  and
     corresponding  regulatory  agencies  in other  counties  and  states of the
     United States.

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<PAGE>

          (ii) "FDA clearance and approval" means any pre-market notification or
     pre-market  approval  application,   consent,  certificate,   registration,
     permit, license or other authorization, and the filing of any notification,
     application,  report  or  information,  required  by the  FDA or any  other
     Government Entity pursuant to any FDA Law.

          (iii)  "FDA TCA  Contractor"  means any  Person  with which TCA or any
     Subsidiary  of TCA  formerly  or  presently  had or has  any  agreement  or
     arrangement  (whether  oral or written)  under which that Person has or had
     physical  possession of, or was or is obligated to develop,  test, process,
     investigate, manufacture or produce, any FDA Regulated Product on behalf of
     TCA or any Subsidiary of TCA.

          (iv)  "FDA  Law"   means  any   statute,   regulation,   judicial   or
     administrative interpretation, guideline, point-to-consider, recommendation
     or standard  international  guidance relating to any FDA Regulated Product.
     "FDA Law"  includes,  without  limitation,  the  Federal  Food,  Drug,  and
     Cosmetic Act, 21 U.S.C. ss. 301 et seq., the FDA Modernization Act of 1997,
     Stand Alone  Provisions,  Pub. L. No. 105-115,  111 Stat. 2295 (1997),  and
     equivalent  statutes,  regulations  and  guidances  adopted  by  countries,
     international  bodies and other  jurisdictions,  in  addition to the United
     States,  where TCA or any TCA Subsidiary (or, as the term "FDA Law" is used
     in Section 4.25, where Thoratec or any Thoratec Subsidiary) has facilities,
     does  business,  or directly or through others sells or offers for sale any
     FDA Regulated  Product.

          (v) "FDA Regulated Product" means any product or component  including,
     without  limitation,  any medical  device,  that is studied,  used, held or
     offered for sale for human research or  investigation  or clinical use.

     (b) TCA and  each of its  Subsidiaries  possesses  all FDA  clearances  and
approvals  required  under  all  applicable  FDA  Laws to  conduct  its  current
businesses, to manufacture, hold and sell FDA Regulated Products, and to use and
occupy  the  TCA  Real  Property  (defined  in  Section  3.20(b)(iv)).  All  FDA
clearances and approvals are in full force and effect.

     (c) There are no facts or circumstances known to TCA that could lead to any
FDA clearances or approvals  possessed by TCA or any of its  Subsidiaries  being
revoked,  suspended,  canceled or not  renewed.  TCA and its  Subsidiaries  have
submitted  all  necessary  reports and filings to the FDA.

     (d) The execution and delivery of the TCA Agreements,  the  consummation of
the Merger and the other  transactions  contemplated by the TCA Agreements,  and


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<PAGE>

the  exercise by TCA and its  Subsidiaries  of the rights to own and operate the
businesses  of TCA  and its  Subsidiaries  and to use and  occupy  the TCA  Real
Property  with  respect to the TCA Real  Property,  as presently  conducted  and
operated,  will not  affect the  validity  or require  the  transfer  of any FDA
clearances or approvals held by TCA or any of its Subsidiaries.

     (e) TCA and its  Subsidiaries  and, to the  knowledge  of TCA, all previous
owners,  lessees,  operators and occupants of all TCA Real Property with respect
to the TCA Real Property,  are in material  compliance with, and have materially
complied with, all applicable FDA Laws and have not received (or, in the case of
such previous owners, lessees,  operators and occupants, to the knowledge of TCA
have not received) any notice of any non-compliance with any FDA Laws within the
past three  years.

     (f) There is no civil,  criminal or administrative  action,  suit,  demand,
claim, complaint,  hearing, notice of violation,  investigation,  notice, demand
letter,  proceeding or request for information pending or any liability (whether
actual or  contingent)  to comply with any FDA Laws that  requires any change in
any  manufacturing  procedures  by TCA or any  Subsidiary  of TCA or the repair,
reinstatement or clean-up of any TCA Real Property.  There is no act,  omission,
event or circumstance of which TCA or any of its Subsidiaries has knowledge that
may give rise to any such  action,  suit,  demand,  claim,  complaint,  hearing,
notice of  violation,  investigations,  notice,  demand  letter,  proceeding  or
request, or any such liability:  (i) against,  involving or of TCA or any of its
Subsidiaries  or (ii)  against,  involving  or of any other  Person  (including,
without limitation,  any FDA TCA Contractor) that could be imputed or attributed
to TCA or any  Subsidiary of TCA.

     (g) There has not been any material violation of any FDA Laws by TCA or its
Subsidiaries in their prior product  developmental  efforts,  clinical  studies,
submissions or reports to the FDA or any other Government Entity (or any failure
to make any such  submission  or report)  that could  reasonably  be expected to
require  investigation,  corrective action or enforcement  action.

     (h) TCA, its Subsidiaries and their respective  agents (in their capacities
as such  agents)  have  registered  with the FDA all  facilities  required to be
registered and have listed all FDA Regulated Products required to be listed with
the FDA.

3.28  Inventories.  The inventories of TCA and its  Subsidiaries  consist of raw
materials and supplies,  manufactured and purchased parts,  work in progress and
finished  products,  all of which are  merchantable and fit for the purposes for
which they were manufactured.  Subject only to the reserves reflected on the TCA


                                       33
<PAGE>

Balance Sheet determined in a manner consistent with TCA's past practices,  none
of those inventories is slow moving, obsolete, damaged or defective.



                                   ARTICLE IV

           REPRESENTATIONS AND WARRANTIES OF THUNDER AND MERGER SUB



     Thoratec   and  Merger  Sub   jointly  and   severally   make  to  TCA  the
representations  and  warranties  contained  in this  Article  IV,  in each case
subject to the exceptions set forth in the disclosure statement, dated as of the
date  hereof,  delivered  by  Thoratec  to TCA  prior to the  execution  of this
Agreement  (the  "Thoratec  Disclosure  Statement").   The  Thoratec  Disclosure
Statement  is arranged in schedules  corresponding  to the numbered and lettered
Sections of this Article IV, and the  disclosure in any schedule of the Thoratec
Disclosure  Statement  shall  qualify  only the  corresponding  Section  of this
Article IV.

4.1   Organization, Etc.

     (a) Each of Thoratec,  its  subsidiaries  listed on Schedule  4.1(a) of the
Thoratec Disclosure Statement (the "Thoratec  Subsidiaries") and Merger Sub is a
corporation duly organized, validly existing and in good standing under the laws
of the  jurisdiction  of its  incorporation  and has  all  requisite  power  and
authority to own,  lease and operate its properties and to carry on its business
as now being conducted. Thoratec and each Thoratec Subsidiary are duly qualified
to do business,  and are each in good standing,  in each jurisdiction  where the
character  of its owned or leased  properties  or the  nature of its  activities
makes such qualification necessary,  except where the failure to be so qualified
or in good standing would not, individually or in the aggregate, have a Thoratec
Material  Adverse  Effect.  For purposes of this Agreement,  "Thoratec  Material
Adverse  Effect"  means any  change,  circumstance,  event or effect that is, or
(including  with the  passage  of time) is  likely to be or  become,  materially
adverse  to  the  general  affairs,  business,  operations,  prospects,  assets,
condition  (financial or otherwise) or results of operations of Thoratec and the
Thoratec  Subsidiaries taken as a whole,  provided that: (i) any adverse change,
event,  circumstance  or effect arising from or relating to general  business or
economic conditions which does not affect Thoratec and the Thoratec Subsidiaries
in a materially disproportionate manner compared to other entities in Thoratec's
and the Thoratec Subsidiaries' industries shall not be deemed to constitute, and
shall not be taken  into  account  in  determining  whether  there  has been,  a


                                       34
<PAGE>

"Thoratec  Material  Adverse Effect" and (ii) any adverse change,  circumstance,
event or effect arising from or relating to the  announcement or pendency of the
Merger shall not be deemed to constitute, and shall not be taken into account in
determining whether there has been, a "Thoratec Material Adverse Effect".

     (b) None of Thoratec, any Thoratec Subsidiary or Merger Sub is in violation
of any provision of its articles of  incorporation,  bylaws or any other charter
document.  Schedule 4.1(b) of the Thoratec Disclosure  Statement sets forth: (i)
the full name of each Thoratec Subsidiary,  its capitalization and the ownership
interest  of  Thoratec  and  each  other  Person  (if  any)  therein,  (ii)  the
jurisdiction  in which each such Thoratec  Subsidiary  is organized,  (iii) each
jurisdiction  in  which  Thoratec  and  each  of the  Thoratec  Subsidiaries  is
qualified  to do  business as a foreign  Person and (iv) a brief  summary of the
business and material operations of each Thoratec Subsidiary.  Thoratec has made
available  to TCA and TEC  accurate  and  complete  copies  of the  articles  of
incorporation,  bylaws and any other charter documents,  as currently in effect,
of Thoratec and each of the Thoratec  Subsidiaries.

4.2 Authority  Relative to This  Agreement.  Each of Thoratec and Merger Sub has
full corporate power and authority to execute and deliver the TCA Agreements and
the TEC  Agreements  and to  consummate  the Merger  and the other  transactions
contemplated  hereby  and  thereby.  The  execution  and  delivery  of  the  TCA
Agreements and the TEC  Agreements,  and the  consummation of the Merger and the
other  transactions  contemplated  hereby and thereby have been duly and validly
authorized  by the board of  directors of each of Thoratec and Merger Sub and no
other  corporate  proceedings  on the part of either  Thoratec or Merger Sub are
necessary  to  authorize  the  TCA  Agreements  and  the  TEC  Agreements  or to
consummate the Merger and the other transactions contemplated hereby and thereby
(other  than,  with  respect to the Merger,  the approval of the issuance of the
Thoratec  Common  Stock in the  Merger at the  Thoratec  Special  Meeting or any
adjournment or postponement  thereof in accordance with California law). Each of
the TCA Agreements and the TEC Agreement has been duly and validly  executed and
delivered  by  Thoratec  (and in the case of this  Agreement,  Merger  Sub) and,
assuming due authorization,  execution and delivery by TCA,  constitutes a valid
and binding  agreement of each of Thoratec and Merger Sub,  enforceable  against
each  of  them  in  accordance  with  its  terms,  except  to  the  extent  that
enforceability   may  be   limited   by   applicable   bankruptcy,   insolvency,
reorganization, moratorium or other laws affecting the enforcement of creditors'
rights generally or by general equitable principles.

4.3 No  Violations,  Etc.  No filing  with or  notification  to,  and no permit,
authorization, consent or approval of, any Government Entity is necessary on the


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<PAGE>

part of Thoratec or Merger Sub for the consummation by Thoratec or Merger Sub of
the Merger or the other  transactions  contemplated  by the TCA Agreements or by
the TEC Agreements,  or the exercise by Thoratec,  TCA and their Subsidiaries of
full rights to own and operate their  businesses as presently  being  conducted,
except  (i)  for the  filing  of the  Articles  of  Merger  as  required  by the
Massachusetts  Law,  (ii) the filing with the SEC and the  effectiveness  of the
Registration  Statement,  (iii) the applicable  requirements of the Exchange Act
(including  with  respect  to  the  Joint  Proxy  Statement/Prospectus),   state
securities or "blue sky" laws, state takeover laws and the listing  requirements
of Nasdaq and (iv) filings required under the HSR Act. None of the execution and
delivery of the TCA Agreements and the TEC Agreements,  the  consummation of the
Merger  or  any of the  other  transactions  contemplated  hereby  and  thereby,
compliance  by  Thoratec  and Merger Sub with all of the  provisions  hereof and
thereof,  or the exercise by Thoratec,  TCA or any of their Subsidiaries of full
rights to own and operate their  businesses  after the Merger as presently being
conducted  (subject to  obtaining  the approval of the issuance of the shares of
Thoratec  Common  Stock  in the  Merger  by the  Holders  of a  majority  of the
outstanding  shares  of  such  stock  at the  Thoratec  Special  Meeting  or any
adjournment or postponement  thereof in accordance with the California Law) will
(i)  conflict  with or result in any breach of any  provision of the articles of
incorporation,  bylaws or any other charter document of Thoratec or any Thoratec
Subsidiary,  (ii) violate any order, writ, injunction,  decree, statute, rule or
regulation applicable to Thoratec or any Thoratec Subsidiary, or by which any of
its properties or assets may be bound,  or (iii) result in a violation or breach
of,  or  constitute  (with or  without  due  notice  or lapse of time or both) a
default under, or result in any material change in, or give rise to any right of
termination, cancellation,  acceleration, redemption or repurchase under, any of
the terms, conditions or provisions of any note, bond, mortgage, indenture, deed
of trust, license,  lease,  agreement or other instrument or obligation to which
Thoratec or any Thoratec Subsidiary is a party or by which any of them or any of
their properties or assets may be bound. Schedule 4.3 of the Thoratec Disclosure
Statement lists all consents,  waivers and approvals  required to be obtained in
connection  with the  consummation of the  transactions  contemplated by the TCA
Agreements  or the  TEC  Agreements  under  any of  Thoratec's  or any  Thoratec
Subsidiary's notes, bonds,  mortgages,  indentures,  deeds of trust, licenses or
leases,  contracts,  agreements or other  instruments or obligations.

4.4 Board  Recommendation.  The board of directors of Thoratec has, at a meeting
duly held on October 2, 2000:  (i)  approved  and adopted  the  Merger,  the TCA
Agreements and the TEC  Agreements,  (ii)  determined  that the Merger,  the TCA
Agreements  and the TEC  Agreements are fair to and in the best interests of the
shareholders  of Thoratec  and (iii)  resolved to  recommend  the  approval  and
adoption  of the  Merger,  the TCA  Agreements  and the  TEC  Agreements  at the


                                       36
<PAGE>

Thoratec  Special  Meeting,  including any adjournments or postponements of that
meeting.

4.5 Capitalization.

     (a) The authorized capital stock of Thoratec consists of 100,000,000 shares
of Common Stock, no par value, of which there were 22,419,753  shares issued and
outstanding as of the date of this Agreement,  and 2,500,000 shares of Preferred
Stock,  no par  value,  of  which no  shares  are  issued  or  outstanding.  The
authorized capital stock of Merger Sub consists of 1,000 shares of Common Stock,
$0.001  par  value,  100 of  which,  as of  the  date  hereof,  are  issued  and
outstanding  and are held by Thoratec.  Merger Sub was formed for the purpose of
consummating  the Merger and has no  material  assets or  liabilities  except as
necessary for such purpose.  All outstanding shares of Thoratec Common Stock are
duly  authorized,  validly  issued,  fully  paid and  nonassessable  and are not
subject to preemptive  rights created by statute,  the articles of incorporation
or bylaws of Thoratec or any agreement to which  Thoratec is a party or by which
it is bound.

     (b) There are no warrants, options, convertible securities,  calls, rights,
stock  appreciation  rights,  preemptive  rights,  rights of first  refusal,  or
agreements or commitments of any nature obligating Thoratec to issue, deliver or
sell,  or cause to be issued,  delivered or sold,  additional  shares of capital
stock or other equity  interests of Thoratec,  or obligating  Thoratec to grant,
issue,  extend,  accelerate  the vesting of, or enter  into,  any such  warrant,
option,  convertible security, call, right, stock appreciation right, preemptive
right,  right of first  refusal,  agreement or  commitment.  Schedule 4.5 to the
Thoratec Disclosure  Statement sets forth the weighted average exercise price of
all outstanding  options to purchase  Thoratec Common Stock. To the knowledge of
Thoratec,  except  for the  Shareholder  Agreement  there are no voting  trusts,
proxies or other agreements or understandings  with respect to the capital stock
of Thoratec.

     (c) Schedule  4.5(c) of the Thoratec  Disclosure  Statement  sets forth the
following  information  with  respect  to each  outstanding  option to  purchase
Thoratec Common Stock: the aggregate number of shares issuable  thereunder,  the
type of option,  the grant date, the expiration date, the exercise price and the
vesting  schedule.  Each option to purchase Thoratec Common Stock was granted in
accordance with the terms of the Thoratec stock option plan applicable  thereto.
Schedule  4.5(c) of the Thoratec  Disclosure  Statement sets forth the following
information with respect to Thoratec's Amended 1996 Nonemployee  Directors Stock
Option Plan: the name of each director of Thoratec  eligible to receive  options
under such plan, the number of options issuable as of the date of this Agreement
to each such  director and an estimate of such  amounts as of the Closing  Date.



                                       37
<PAGE>

4.6 Registration Statement; Joint Proxy Statement/Prospectus. The information to
be supplied by Thoratec  for  inclusion  or  incorporation  by  reference in the
Registration  Statement as it relates to Thoratec,  the Thoratec Subsidiaries or
Merger Sub, at the time the Registration  Statement is declared effective by the
SEC, shall not contain any untrue  statement of a material fact or omit to state
any material  fact  required to be stated  therein or necessary in order to make
the  statements  therein  not  misleading.  The  information  to be  supplied by
Thoratec for inclusion in the Joint Proxy Statement/Prospectus,  at the date the
Joint Proxy Statement/Prospectus is first mailed to stockholders, at the time of
the TCA Special Meeting and the Thoratec Special  Meeting,  and at the Effective
Time shall not contain any untrue  statement of a material fact or omit to state
any material  fact  required to be stated  therein or necessary in order to make
the  statements  therein,  in light of the  circumstances  under which they were
made, not misleading. If at any time prior to the Effective Time, any event with
respect to  Thoratec or any  Thoratec  Subsidiary  (including  Merger Sub) shall
occur which is required to be described in the Joint Proxy Statement/Prospectus,
such event  shall be so  described,  and an  amendment  or  supplement  shall be
promptly  filed  with the SEC  and,  as  required  by law,  disseminated  to the
shareholders of TCA, Thoratec or both, as appropriate.

4.7 SEC Filings.  Thoratec has filed with the SEC all required  forms,  reports,
registration  statements  and documents  required to be filed by it with the SEC
(collectively,  all such forms, reports,  registration  statements and documents
filed  after  January  1,  1997 are  referred  to herein  as the  "Thoratec  SEC
Reports"),  all of which complied as to form when filed in all material respects
with the  applicable  provisions of the  Securities Act and the Exchange Act, as
the case may be.  Accurate and complete  copies of the Thoratec SEC Reports have
been made available to TCA and TEC. As of their  respective  dates, the Thoratec
SEC  Reports  (including  all  exhibits  and  schedules  thereto  and  documents
incorporated by reference  therein) did not, at the time they were filed (or, if
amended or superseded by a filing prior to the date hereof,  then on the date of
such filing) contain any untrue  statement of a material fact or omit to state a
material fact required to be stated  therein or necessary to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading. To the knowledge of Thoratec, no director or officer of Thoratec has
failed to comply with any filing  requirements under Section 13 or Section 16(a)
of the Exchange Act.

4.8  Compliance  with Laws.  Neither  Thoratec nor any Thoratec  Subsidiary  has
violated  or  failed  to  comply  with  any  statute,  law,  ordinance,  rule or
regulation (including,  without limitation,  relating to the export or import of
goods or technology) of any Government Entity,  except where any such violations
or  failures  to comply  would not,  individually  or in the  aggregate,  have a


                                       38
<PAGE>

Thoratec Material Adverse Effect. Thoratec and each Thoratec Subsidiary have all
permits,  licenses and franchises from Government  Entities  required to conduct
their businesses as now being conducted and as proposed to be conducted,  except
for those the absence of which would not, individually or in the aggregate, have
a Thoratec  Material  Adverse  Effect.

4.9  Financial  Statements.   Each  of  the  consolidated  financial  statements
(including,  in each case, any related notes thereto)  contained in the Thoratec
SEC  Reports  (the  "Thoratec  Financial  Statements"):   (i)  was  prepared  in
accordance  with GAAP  applied on a  consistent  basis  throughout  the  periods
involved  (except as may be  indicated  in the notes  thereto or, in the case of
unaudited interim financial  statements,  as may be permitted by the SEC on Form
10-Q  under  the  Exchange  Act)  and (ii)  fairly  presented  the  consolidated
financial  position of Thoratec  and the Thoratec  Subsidiaries  in all material
respects as of the respective dates thereof and the consolidated  results of its
operations and cash flows for the periods  indicated,  consistent with the books
and records of Thoratec,  except that the unaudited interim financial statements
were or are subject to normal and recurring year-end adjustments which were not,
or are not  expected to be,  material in amount.  The balance  sheet of Thoratec
contained  in  Thoratec's  Form  10-Q  for the  quarter  ended  July 1,  2000 is
hereinafter  referred  to as the  "Thoratec  Balance  Sheet."

4.10  Absence of  Undisclosed  Liabilities.  Neither  Thoratec  nor any Thoratec
Subsidiary  has any  liabilities  (absolute,  accrued,  contingent or otherwise)
other  than (i)  liabilities  included  in the  Thoratec  Balance  Sheet and the
related notes to the financial statements,  (ii) normal or recurring liabilities
incurred in the  ordinary  course of  business  consistent  with past  practice,
which,  individually  or in the  aggregate,  are not or would not be  reasonably
likely to have, a Thoratec Material Adverse Effect,  and (iii) liabilities under
this  Agreement.

4.11 Absence of Changes or Events.  Except as  contemplated  by this  Agreement,
since July 1, 2000 no Thoratec  Material  Adverse  Effect has  occurred  and, in
addition,   Thoratec  and  the  Thoratec  Subsidiaries  have  not,  directly  or
indirectly:

     (a)  purchased,  otherwise  acquired,  or agreed to purchase  or  otherwise
acquire,  any shares of capital  stock or any  indebtedness  of  Thoratec or any
Thoratec  Subsidiary,  or declared,  set aside or paid any dividend or otherwise
made a distribution (whether in cash, stock, debt or property or any combination
thereof)  in respect of their  capital  stock  (other  than  dividends  or other
distributions payable solely to Thoratec or a wholly owned Thoratec Subsidiary);

     (b) authorized for issuance, issued, sold, delivered, granted or issued any
options, warrants, calls, subscriptions or other rights for, or otherwise agreed


                                       39
<PAGE>


or committed to issue,  sell or deliver any shares of any class of capital stock
of Thoratec or any Thoratec  Subsidiary or any  securities  convertible  into or
exchangeable or exercisable for shares of any class of capital stock of Thoratec
or any Thoratec  Subsidiary,  other than pursuant to and in accordance  with the
Thoratec  stock  option  plans and  warrants  disclosed  on Schedule  4.5 to the
Thoratec Disclosure Statement;

     (c) (i) created or incurred any  indebtedness  for borrowed money exceeding
$250,000 in the aggregate, (ii) assumed, guaranteed, endorsed or otherwise as an
accommodation  become  responsible for the obligations of any other  individual,
firm or corporation, made any loans or advances to any other individual, firm or
corporation exceeding $100,000 in the aggregate,  (iii) entered into any oral or
written   agreement,   commitment  or  transaction  or  incurred  any  liability
involving,  in any one case, in excess of $100,000;

     (d)  instituted any change in accounting  methods,  principles or practices
other than as required by GAAP or the rules and  regulations  promulgated by the
SEC and disclosed in the notes to the Thoratec Financial Statements;

     (e) revalued any assets,  including  without  limitation,  writing down the
value of  inventory  or writing  off notes or accounts  receivable  in excess of
amounts  previously  reserved as reflected in the Thoratec  Balance  Sheet;

     (f) suffered any damage,  destruction or loss, whether covered by insurance
or not, except for such as would not,  individually  or in the aggregate  exceed
$100,000;

     (g) (i) increased in any manner the  compensation  of any of its directors,
officers or, other than in the ordinary  course of business and consistent  with
past practice,  non-officer employees, (ii) granted any severance or termination
pay  to  any  Person;  (iii)  entered  into  any  oral  or  written  employment,
consulting,  indemnification or severance  agreement with any Person; (iv) other
than as  required  by law,  adopted,  become  obligated  under,  or amended  any
employee  benefit  plan,  program or  arrangement  or (v)  repriced  any options
granted under the Thoratec stock option plans;

     (h) sold, transferred, leased, licensed, pledged, mortgaged, encumbered, or
otherwise  disposed of, or agreed to sell,  transfer,  lease,  license,  pledge,
mortgage, encumber, or otherwise dispose of, any material properties, (including
intangibles,  real, personal or mixed), it being understood that this clause (h)
does not extend to sales of inventory in the  ordinary  course of business;


                                       40
<PAGE>


     (i) amended  its  articles of  incorporation,  bylaws or any other  charter
document,  or  effected  or been a party  to any  merger,  consolidation,  share
exchange,  business combination,  recapitalization,  reclassification of shares,
stock split, reverse stock split or similar transaction;

     (j) made any capital expenditure in any calendar month which, when added to
all other capital expenditures made by or on behalf of Thoratec and the Thoratec
Subsidiaries  in such  calendar  month  resulted  in such  capital  expenditures
exceeding  $150,000 in the  aggregate;

     (k) paid,  discharged  or satisfied  any material  claims,  liabilities  or
obligations  (absolute,  accrued,  contingent  or  otherwise),  other  than  the
payment,  discharge or satisfaction of liabilities  (including accounts payable)
in the  ordinary  course of  business  and  consistent  with past  practice,  or
collected,  or  accelerated  the  collection  of, any  amounts  owed  (including
accounts  receivable)  other than their  collection  in the  ordinary  course of
business;

     (l) waived, released,  assigned.  settled or compromised any material claim
or litigation,  or commenced a lawsuit other than for the routine  collection of
bills  or

     (m) agreed or proposed to do any of the things  described in the  preceding
clauses (a) through (l) other than as expressly  contemplated or provided for in
this Agreement.

4.12 Capital Stock of Subsidiaries.  Thoratec is the record and beneficial owner
of all of the outstanding  shares of capital stock or other equity  interests of
each Thoratec  Subsidiary.  All of such shares have been duly authorized and are
validly issued,  fully paid,  nonassessable  and free of preemptive  rights with
respect  thereto and are owned by Thoratec free and clear of any claim,  lien or
encumbrance  of any kind with  respect  thereto.  There are no proxies or voting
agreements with respect to such shares,  and there are not any existing options,
warrants,  calls,  subscriptions,   or  other  rights  or  other  agreements  or
commitments obligating Thoratec or any Thoratec Subsidiary to issue, transfer or
sell any  shares  of  capital  stock of any  Thoratec  Subsidiary  or any  other
securities  convertible  into,  exercisable  for,  or  evidencing  the  right to
subscribe for any such shares.  Thoratec does not directly or indirectly own any
equity interest in any Person except the Thoratec Subsidiaries.

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<PAGE>


4.13  Litigation.

     (a) There is no Action pending or, to the knowledge of Thoratec, threatened
in  writing  against  Thoratec  or any  Thoratec  Subsidiary,  or  any of  their
respective  officers and directors (in their  capacities as such),  or involving
any of their  assets,  before  any  court,  Governmental  Entity or  arbitration
tribunal,  except for those Actions  which,  individually  or in the  aggregate,
would not have a Thoratec  Material  Adverse Effect.  There is no Action pending
or, to the  knowledge of Thoratec,  threatened  which in any manner  challenges,
seeks to, or is reasonably likely to prevent,  enjoin, alter or delay any of the
transactions contemplated by this Agreement.

     (b) There is no outstanding judgment,  order, writ, injunction or decree of
any court,  Governmental Entity or arbitration tribunal in a proceeding to which
Thoratec, any Thoratec Subsidiary or any of their assets is a party, or by which
Thoratec,  any  Thoratec  Subsidiary  or any of  their  assets  is  bound.

4.14  Insurance.  Schedule 4.14 of the Thoratec  Disclosure  Statement lists all
insurance  policies  (including,   without  limitation,   workers'  compensation
insurance  policies) covering any business,  properties or assets of Thoratec or
any  Thoratec  Subsidiary,  and all claims in excess of $50,000 made against any
such policies since January 1, 1997.  All such policies are in effect,  and true
and complete  copies of all such  policies  have been made  available to TCA and
TEC.  Thoratec  has not  received  any notice of the  cancellation  or threat of
cancellation of any of such policy.

4.15  Contracts and Commitments.

     (a)  Schedule  4.15(a)  of the  Thoratec  Disclosure  Statement  contains a
complete and accurate list of all agreements,  understanding  and  arrangements,
whether written,  oral or established through common practice,  between Thoratec
or  any  Thoratec   Subsidiary  and  any  Person  that  directly  or  indirectly
beneficially  owns, or is controlled by or under common  control with any Person
that  beneficially  owns,  more than five  percent of the  outstanding  Thoratec
Common Stock (the "Thoratec Related Party Agreements").  True and correct copies
of all Thoratec  Related Party  Agreements have been provided to TCA and TEC. To
the knowledge of Thoratec,  the terms of the Thoratec  Related Party  Agreements
are no less  favorable to Thoratec and the Thoratec  Subsidiaries  than could be
obtained from a third party in an arms-length transaction.

     (b)  Except  as  filed   (including  by   incorporation   by  reference  to
earlier-filed  documents)  as an exhibit to the Thoratec SEC Reports filed after
January 1, 2000 or as identified on Schedule 4.15(b) to the Thoratec  Disclosure
Statement  (collectively the "Thoratec Contracts",  it being understood that the


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<PAGE>

failure to identify an  agreement,  etc. on that schedule that is required to be
identified  on that  schedule  shall  nevertheless  be  considered  a  "Thoratec
Contract"),  neither Thoratec nor any Thoratec Subsidiary is a party to or bound
by any oral or written contract,  obligation or commitment of any type in any of
the following  categories:

          (i)  agreements  with any employees or  consultants of Thoratec or any
     Thoratec Subsidiary respecting their employment, consulting, salary, wages,
     bonuses,  incentive  compensation,  severance  or  retention  pay, or other
     compensation,  except for those employees or consultants  whose annual rate
     of compensation, including potential bonuses and incentive compensation, is
     less than $100,000;

          (ii)  agreements  or plans under which  benefits  will be increased or
     accelerated by the occurrence of any of the  transactions  contemplated  by
     the TCA  Agreements  or the TEC  Agreements or under which the value of the
     benefits  will  be  calculated  on the  basis  of  any of the  transactions
     contemplated by such agreements;

          (iii) agreements, contracts or commitments currently in force relating
     to the  disposition  or  acquisition  of assets  other than in the ordinary
     course  of  business,   or  relating  to  an  ownership   interest  in  any
     corporation,  partnership, joint venture or other business enterprise;

          (iv)  agreements,  contracts or commitments for the purchase of goods,
     supplies or equipment:  (A) which are with sole or single source  suppliers
     or (B) for a cost, for any one such agreement,  contract and commitment, in
     excess of $250,000 and which,  in the case of this clause (B),  provide for
     purchase prices  substantially  greater than those presently prevailing for
     such materials,  supplies or equipment;

          (v) guarantees or other  agreements,  contracts or  commitments  under
     which  Thoratec or any Thoratec  Subsidiary is  absolutely or  contingently
     liable for (A) the  performance of any other Person (other than Thoratec or
     any Thoratec Subsidiary),  or (B) the whole or any part of the indebtedness
     or payment  obligations  of any other  Person  (other than  Thoratec or any
     Thoratec Subsidiary);

          (vi)  powers of  attorney  authorizing  the  incurrence  of a material
     obligation on the part of Thoratec or any Thoratec Subsidiary;

          (vii) agreements, contracts or commitments which limit or restrict (A)
     where  Thoratec or any Thoratec  Subsidiary may conduct  business,  (B) the


                                       43
<PAGE>

     type or lines of  business  (current or future) in which they may engage or
     (C) any acquisition of assets or stock (tangible or intangible) by Thoratec
     or any Thoratec  Subsidiary;

          (viii) agreements,  contracts or commitments  containing any agreement
     with respect to a change of control of Thoratec or any Thoratec Subsidiary;

          (ix) agreements, contracts or commitments for the borrowing or lending
     of money, or the availability of credit (except credit extended by Thoratec
     or any Thoratec  Subsidiary to customers in the ordinary course of business
     and consistent with past practice);

          (x) any hedging,  option,  derivative or other similar transaction and
     any foreign  exchange  position or contract for the exchange of currency or

          (xi) any  joint  marketing  or  joint  development  agreement,  or any
     license or  distribution  agreement  relating  to any  Thoratec  product or
     planned product.

     (c)  Neither  Thoratec  or  any  Thoratec  Subsidiary,  nor  to  Thoratec's
knowledge  any other  party to a Thoratec  Contract,  has  materially  breached,
violated or defaulted  under, or received notice that it has breached,  violated
or defaulted  under (nor does there exist any  condition  under which,  with the
passage of time or the giving of notice or both, could reasonably be expected to
cause a material breach, violation or default under), any Thoratec Contract.

     (d) Each Thoratec Contract is a valid,  binding and enforceable  obligation
of Thoratec,  and to Thoratec's knowledge of the other party or parties thereto,
in accordance with its terms, and is in full force and effect,  except where the
failure to be valid, binding, enforceable and in full force and effect would not
have a Thoratec  Material  Adverse Effect and to the extent  enforcement  may be
limited by applicable bankruptcy, insolvency, moratorium or other laws affecting
the enforcement of creditors' rights or by general  principles of equity.

     (e) An accurate and complete copy of each  Thoratec  Contract has been made
available to TCA and TEC.

4.16 Labor Matters; Employment and Labor Contracts.

     (a) None of Thoratec  or any  Thoratec  Subsidiary  is a party to any union
contract or other  collective  bargaining  agreement,  nor to the  knowledge  of
Thoratec or any Thoratec  Subsidiary  are there any activities or proceedings of
any labor  union to organize  any of its  employees.  Each of  Thoratec  and the


                                       44
<PAGE>

Thoratec Subsidiaries is in compliance with all applicable (i) laws, regulations
and agreements respecting  employment and employment  practices,  (ii) terms and
conditions of employment, and (iii) occupational health and safety requirements,
except for those  failures to comply which,  individually  or in the  aggregate,
would not have a Thoratec Material Adverse Effect.

     (b) There is no labor  strike,  slowdown or stoppage  pending (or any labor
strike or stoppage threatened) against Thoratec or any Thoratec  Subsidiary.  No
petition  for  certification  has been filed and is pending  before the National
Labor  Relations Board with respect to any employees of Thoratec or any Thoratec
Subsidiary.  Neither  Thoratec nor any Thoratec  Subsidiary has any  obligations
under COBRA,  with respect to any former  employees or qualifying  beneficiaries
thereunder,  except for obligations that would not have,  individually or in the
aggregate,  a  Thoratec  Material  Adverse  Effect.  There are no  controversies
pending or, to the knowledge of Thoratec or any Thoratec Subsidiary, threatened,
between  Thoratec  or  any  Thoratec  Subsidiary  and  any of  their  respective
employees,  which controversies would have,  individually or in the aggregate, a
Thoratec Material Adverse Effect.

4.17 Fairness Opinion. Thoratec has received the opinion of Lehman Brothers Inc.
dated on or before the date of this Agreement to the effect that, as of the date
hereof,  the Exchange Ratio is fair to Thoratec from a financial  point of view,
and has provided a copy of that opinion to TCA and TEC.

4.18  Intellectual Property Rights.

     (a) Thoratec and the Thoratec Subsidiaries own or have the right to use all
intellectual   property  used  to  conduct  their  respective  businesses  (such
intellectual property and the rights thereto are collectively referred to as the
"Thoratec IP Rights").  No royalties or other payments are payable to any Person
with respect to  commercialization of any products presently sold by Thoratec or
the Thoratec Subsidiaries.

     (b) The execution,  delivery and  performance of the TCA Agreements and the
consummation of the transactions  contemplated hereby will not: (i) constitute a
material breach of any instrument or agreement governing any Thoratec IP Rights,
(ii) cause the modification of any terms of any licenses or agreements  relating
to any Thoratec IP Rights including, but not limited to, the modification of the
effective  rate of any  royalties  or other  payments  provided  for in any such
license or agreement,  (iii) cause the forfeiture or termination of any Thoratec
IP  Rights,  (iv)  give  rise to a right of  forfeiture  or  termination  of any


                                       45
<PAGE>

Thoratec IP Rights or (v) materially  impair the right of Thoratec or any of the
Thoratec  Subsidiaries to use, sell or license any Thoratec IP Rights or portion
thereof.

     (c) Neither the manufacture,  marketing,  license,  sale or intended use of
any product or technology  currently  licensed or sold or under  development  by
Thoratec or any of the  Thoratec  Subsidiaries:  (i)  violates  in any  material
respect  any  license  or  agreement  between  Thoratec  or any of the  Thoratec
Subsidiaries and any third party or (ii) to the knowledge of Thoratec, infringes
in any material respect any patents or other intellectual property rights of any
other party.  There is no pending or, to the  knowledge of Thoratec,  threatened
claim or litigation  contesting  the validity,  ownership or right to use, sell,
license or dispose of any Thoratec IP Rights,  or asserting that any Thoratec IP
Rights or the  proposed  use,  sale,  license  or  disposition  thereof,  or the
manufacture,  use or sale of any Thoratec  products,  conflicts or will conflict
with the rights of any other party.

     (d)  Thoratec has  provided to TCA a worldwide  list of all patents,  trade
names,  trademarks and service marks,  and applications for any of the foregoing
owned or possessed by Thoratec or any of the Thoratec Subsidiaries.

     (e) Thoratec  has provided to TCA a true and complete  copy of its standard
form of employee  confidentiality  agreement and taken  commercially  reasonable
steps to ensure that all key employees and scientific  employees (whether or not
key) of Thoratec and the Thoratec  Subsidiaries have executed such an agreement.
All scientific consultants with access to proprietary information of Thoratec or
any Thoratec Subsidiary have executed appropriate non-disclosure agreements with
respect to such proprietary  information.

     (f) Neither  Thoratec nor any Thoratec  Subsidiary is aware that any of its
key or scientific  employees or scientific  consultants  is obligated  under any
contract, covenant or other agreement or commitment of any nature, or subject to
any judgment,  decree or order of any court or administrative agency, that would
interfere  with the use of such  employee's  or  consultant's  best  efforts  to
promote the  interests of Thoratec and the Thoratec  Subsidiaries  or that would
conflict  with the business of Thoratec or any of the Thoratec  Subsidiaries  as
presently conducted or proposed to be conducted. Neither Thoratec nor any of the
Thoratec  Subsidiaries  has entered into any  agreement  to indemnify  any other
person,  including  but not limited to any employee or consultant of Thoratec or
any  of  the  Thoratec   Subsidiaries,   against  any  charge  of  infringement,
misappropriation   or  misuse  of  any   intellectual   property,   other   than
indemnification  provisions  contained in purchase orders or customer agreements
arising  in the  ordinary  course of  business.  All  current  and former key or
scientific  employees  and  key  consultants  of any of  Thoratec  or any of the
Thoratec  Subsidiaries  who in  Thoratec's  reasonable  business  judgment  were


                                       46
<PAGE>

appropriate have signed valid and enforceable written assignments to Thoratec or
one or more of the Thoratec  Subsidiaries of any and all rights or claims in any
intellectual  property that any such  employee or consultant  has or may have by
reason of any  contribution,  participation  or other  role in the  development,
conception,  creation,  reduction to practice or  authorship  of any  invention,
innovation, development or work of authorship or any other intellectual property
that is used in the  business of Thoratec or any of the  Thoratec  Subsidiaries,
and Thoratec and the Thoratec  Subsidiaries  possess  signed  copies of all such
written assignments by such employees and consultants.

4.19 Taxes.

     (a)  Thoratec  and each of the  Thoratec  Subsidiaries  have  filed all Tax
Returns required to have been filed by them, and have paid (or Thoratec has paid
on behalf of the Thoratec  Subsidiaries),  all Taxes required to have been shown
on such Tax  Returns.  The most recent  financial  statements  contained  in the
Thoratec  SEC  Reports   reflect  an  adequate   accrual  (which  accruals  were
established  in  accordance  with GAAP) for the payment of all Taxes  payable by
Thoratec  and the  Thoratec  Subsidiaries,  as of the  date  of  such  financial
statements.  Except as  reasonably  would not have a Thoratec  Material  Adverse
Effect,  no deficiencies for any Taxes have been proposed,  asserted or assessed
against Thoratec or any of the Thoratec  Subsidiaries.  Neither Thoratec nor any
of the Thoratec Subsidiaries has filed for any extension of time to file any Tax
Return  which has not since been  filed,  in each case filed or  required  to be
filed with a Government Entity.

     (b) Neither Thoratec nor any of the Thoratec Subsidiaries is a party to any
contract,  agreement, plan or arrangement including, but not limited to, the TCA
Agreements,  covering any employee or former  employee of Thoratec or any of the
Thoratec  Subsidiaries  that:  (i) could give rise to the payment of any amounts
that would constitute  excess parachute  payments within the meaning of Sections
280G of the Code with  respect to the change in  ownership  or control  that may
occur upon the consummation of the Merger or (ii) could give rise to the payment
of any amount that would  constitute a parachute  payment  within the meaning of
Section  280G of the Code with  respect to any change in ownership or control of
Thoratec occurring after the Closing Date. During the taxable year ending on the
Closing Date,  Thoratec and the Thoratec  Subsidiaries have not become obligated
to make any  payment the  deduction  of which  would be  disallowed  pursuant to
Section 162(m) of the Code.

     (c) None of Thoratec  and the Thoratec  Subsidiaries  has filed any consent
agreement  under Section 341(f) of the Code or agreed to have Section  341(f)(2)


                                       47
<PAGE>

of the Code apply to any  disposition  of a Subsection  (f) asset (as defined in
Section  341(f)(4)  of the  Code)  owned  by  Thoratec  or  any of the  Thoratec
Subsidiaries.

     (d) None of Thoratec  and the Thoratec  Subsidiaries:  (i) has received any
notice that it is being  audited by any taxing  authority,  (ii) has granted any
presently operative waiver of any statute of limitations with respect to, or any
extension of a period for the  assessment  of, any Tax,  (iii) has permitted any
Tax  lien  to be  placed  on any  asset  of  Thoratec  or  any  of the  Thoratec
Subsidiaries,  except with  respect to Taxes not yet due and payable or (iv) has
availed itself of any Tax amnesty or similar relief in any taxing  jurisdiction.

     (e) None of Thoratec and the Thoratec  Subsidiaries  is aware of any reason
why the Merger will fail to qualify as a reorganization  under the provisions of
Section 368(a) of the Code.

     (f) Thoratec has not been a United States real property holding corporation
within the meaning of Section  897 of the Code at any time after June 30,  1995.

     (g) Neither Thoratec nor any of the Thoratec Subsidiaries has any liability
for the Taxes of any  Person  other than  itself,  Thoratec  or another  present
Thoratec Subsidiary.  Neither Thoratec nor any of the Thoratec Subsidiaries is a
party to any tax  sharing or tax  indemnity  agreement.

4.20 Employee Benefit Plans; ERISA.

     (a) There are no  "employee  pension  benefit  plans" as defined in Section
3(2) of ERISA ("Thoratec Pension Plans"),  "welfare benefit plans" as defined in
Section 3(1) of ERISA ("Thoratec Welfare Plans"),  or stock bonus, stock option,
restricted stock, stock appreciation  right, stock purchase,  bonus,  incentive,
deferred  compensation,  severance,  holiday,  or vacation  plans,  or any other
employee benefit plan,  program,  policy or arrangement  covering  employees (or
former  employees)  employed in the United  States that either is  maintained or
contributed  to by Thoratec,  any of the Thoratec  Subsidiaries  or any Thoratec
ERISA  Affiliate  (as  hereinafter  defined)  or to which  Thoratec,  any of the
Thoratec  Subsidiaries  or any  Thoratec  ERISA  Affiliate  is obligated to make
payments  or  otherwise  may have any  liability  (collectively,  the  "Thoratec
Employee  Benefit  Plans")  with  respect to  employees  or former  employees of
Thoratec, any of the Thoratec Subsidiaries, or any Thoratec ERISA Affiliate. For
purposes of this  Agreement,  "Thoratec  ERISA  Affiliate"  means any person (as
defined in Section  3(9) of ERISA)  that is or has been a member of any group of


                                       48
<PAGE>

persons  described in Section  414(b),  (c), (m) or (o) of the Code,  including,
without limitation, Thoratec or a Thoratec Subsidiary.

     (b)  Thoratec  and  each  of the  Thoratec  Subsidiaries,  and  each of the
Thoratec  Pension  Plans and Thoratec  Welfare  Plans,  are in compliance in all
material  respects with the applicable  provisions of ERISA,  the Code and other
applicable  laws.

     (c) All  contributions  to, and payments from,  the Thoratec  Pension Plans
which are required to have been made in  accordance  with the  Thoratec  Pension
Plans have been timely made.

     (d) All Thoratec Pension Plans intended to qualify under Section 401 of the
Code  have  been  determined  by the IRS to be so  qualified,  and no event  has
occurred  and no  condition  exists with respect to the form or operation of any
Thoratec  Pension Plan which would cause the loss of such  qualification  or the
imposition of any material liability, penalty or tax under ERISA or the Code.

     (e)  There  are no (i)  investigations  pending  by any  Government  Entity
involving  any Thoratec  Pension Plan or Thoratec  Welfare Plan, or (ii) pending
or, to the knowledge of Thoratec,  threatened  claims (other than routine claims
for  benefits),  suits or  proceedings  against  any  Thoratec  Pension  Plan or
Thoratec  Welfare  Plan,  against  the  assets  of any of the  trusts  under any
Thoratec  Pension Plan or Thoratec  Welfare Plan or against any fiduciary of any
Thoratec  Pension Plan or Thoratec Welfare Plan with respect to the operation of
such plan or  asserting  any  rights or claims to  benefits  under any  Thoratec
Pension  Plan or Thoratec  Welfare Plan or against the assets of any trust under
any such  plan,  except  for  those  which  would  not,  individually  or in the
aggregate,  give rise to any  liability  which  would have a  Thoratec  Material
Adverse Effect.  To the best of Thoratec's  knowledge,  there are no facts which
would give rise to any liability  under this Section  4.20(e),  except for those
which would not,  individually  or in the  aggregate,  either impair  Thoratec's
ability to consummate the Merger or any of the other  transactions  contemplated
hereby or have a Thoratec Material Adverse Effect.

     (f) None of Thoratec,  any of the Thoratec  Subsidiaries or any employee of
the  foregoing,  nor any trustee,  administrator,  other  fiduciary or any other
"party in  interest"  or  "disqualified  person"  with  respect to any  Thoratec
Pension Plan or Thoratec Welfare Plan, has engaged in a "prohibited transaction"
(as that term is defined in  Section  4975 of the Code or Section  406 of ERISA)
other than such transactions  that would not,  individually or in the aggregate,
either impair  Thoratec's  ability to consummate  the Merger or any of the other
transactions contemplated hereby or have a Thoratec Material Adverse Effect.



                                       49
<PAGE>

     (g) None of  Thoratec,  any of the Thoratec  Subsidiaries,  or any Thoratec
ERISA  Affiliate  maintains or  contributes  to, nor has it ever  maintained  or
contributed  to, any pension plan subject to Title IV of ERISA or Section 412 of
the Code or Section 302 of ERISA.

     (h)  None of  Thoratec,  any  Thoratec  Subsidiary  or any  Thoratec  ERISA
Affiliate has incurred any material  liability  under Title IV of ERISA that has
not been satisfied in full.

     (i) None of  Thoratec,  any of the  Thoratec  Subsidiaries  or any Thoratec
ERISA Affiliate has any material liability  (including any contingent  liability
under Section 4204 of ERISA) with respect to any multiemployer  plan, within the
meaning of Section  3(37) of ERISA,  covering  employees  (or former  employees)
employed in the United States.

     (j) With  respect to each of the Thoratec  Employee  Benefit  Plans,  true,
correct and complete copies of the following  documents have been made available
to TCA:  (i) the  plan  document  and any  related  trust  agreement,  including
amendments  thereto,  (ii) any  current  summary  plan  descriptions  and  other
material  communications  to  participants  relating  to the  Thoratec  Employee
Benefit Plans,  (iii) the three most recent Forms 5500, if applicable,  and (iv)
the  most  recent  IRS  determination  letter,  if  applicable.

     (k) None of the Thoratec Welfare Plans provides for continuing  benefits or
coverage for any  participant  or any  beneficiary  of a  participant  following
termination of employment,  except as may be required under COBRA,  or except at
the expense of the participant or the  participant's  beneficiary.  Thoratec and
each of the Thoratec  Subsidiaries  which  maintain a "group health plan" within
the meaning of Section  5000(b)(1) of the Code have complied with the notice and
continuation  requirements  of  Section  4980B  of the  Code,  COBRA,  Part 6 of
Subtitle B of Title I of ERISA and the regulations  thereunder  except where the
failure to comply would not,  individually  or in the  aggregate,  either impair
Thoratec's   ability  to  consummate   the  Merger  or  any  other   transaction
contemplated hereby or have a Thoratec Material Adverse Effect.

     (l) No liability under any Thoratec  Pension Plan or Thoratec  Welfare Plan
has been funded nor has any such  obligation been satisfied with the purchase of
a  contract  from  an  insurance  company  as to  which  Thoratec  or any of its
Subsidiaries   has   received   notice  that  such   insurance   company  is  in
rehabilitation  or  a  comparable  proceeding.



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<PAGE>

     (m) The  consummation  of the  transactions  contemplated  by the  Thoratec
Agreements  will not  result in an  increase  in the amount of  compensation  or
benefits  or  accelerate  the  vesting or timing of payment of any  benefits  or
compensation  payable to or in respect of any employee of Thoratec or any of its
Subsidiaries.

     (n)  Schedule  4.20(n)  of the  Thoratec  Disclosure  Statement  lists each
Thoratec  Foreign  Plan  (as  hereinafter  defined).  Thoratec  and  each of the
Thoratec  Subsidiaries  and each of the Thoratec Foreign Plans are in compliance
with  applicable  laws,  and all  required  contributions  have been made to the
Thoratec Foreign Plans, except where the failure to comply or make contributions
would not, individually or in the aggregate, either impair Thoratec's ability to
consummate  the Merger or any other  transaction  contemplated  hereby or have a
Thoratec  Material Adverse Effect.  Each of the Thoratec Foreign Plans that is a
funded defined  benefit pension plan has a fair market value of plan assets that
is  greater  than the plan's  liabilities,  as  determined  in  accordance  with
applicable  laws. For purposes hereof,  "Thoratec  Foreign Plan" means any plan,
program,  policy,  arrangement or agreement  maintained or contributed to by, or
entered  into with,  Thoratec or any  Thoratec  Subsidiary  with  respect to any
employees (or former employees) employed outside the United States to the extent
the benefits provided  thereunder are not mandated by the laws of the applicable
foreign jurisdiction.

4.21 Environmental Matters.

     (a) For purposes of this Agreement,  "Thoratec Contractor" means any Person
with which  Thoratec or any Thoratec  Subsidiary  formerly or presently  has any
agreement or  arrangement  (whether oral or written) under which such Person has
or had  physical  possession  of,  and was or is  obligated  to  develop,  test,
process,  manufacture  or produce any product or substance on behalf of Thoratec
or any Thoratec Subsidiary.

     (b) Except for such cases that, individually or in the aggregate,  have not
and would not have a Thoratec Material Adverse Effect:

          (i) Each of  Thoratec  and the  Thoratec  Subsidiaries  possesses  all
     Environmental  Permits  required  under  applicable  Environmental  Laws to
     conduct  its  current  business  and to use and  occupy the  Thoratec  Real
     Property (as defined  below) for its current  business.  All  Environmental
     Permits  are in full  force  and  effect  and  Thoratec  and each  Thoratec
     Subsidiary  are, and to  Thoratec's  knowledge  have at all times been,  in
     compliance with such Environmental Permits.

          (ii)  There  are  no  facts  or  circumstances   indicating  that  any
     Environmental   Permit  possessed  by  Thoratec  or  any  of  the  Thoratec


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<PAGE>

     Subsidiaries would or might be revoked, suspended, canceled or not renewed,
     and all  appropriate  necessary  action in  connection  with the renewal or
     extension  of  all  Environmental  Permits  possessed  by  Thoratec  or any
     Thoratec  Subsidiary relating to the current business and the Thoratec Real
     Property has been taken.

          (iii)  The  execution  and  delivery  of the  TCA  Agreements  and the
     consummation  by  Thoratec  of  the  Merger  and  the  other   transactions
     contemplated  hereby  and  the  exercise  by  Thoratec  and  the  Surviving
     Corporation  of rights to own and operate the  business of Thoratec and the
     Thoratec  Subsidiaries  and use and occupy the Thoratec  Real  Property and
     carry on its business as presently  conducted  will not affect the validity
     or require the  transfer of any  Environmental  Permits held by Thoratec or
     any of the  Thoratec  Subsidiaries  and will not require any  notification,
     disclosure,  registration,  reporting, filing, investigation or remediation
     under  any  Environmental  Law.

          (iv)  Thoratec  and  each of the  Thoratec  Subsidiaries  and,  to the
     knowledge  of  Thoratec,  all  previous  owners,  lessees,   operators  and
     occupants of the real property now or previously owned,  leased or occupied
     by  Thoratec  or any of  the  Thoratec  Subsidiaries  (the  "Thoratec  Real
     Property"), are in compliance with, and within the period of all applicable
     statutes of  limitation,  have complied with all  applicable  Environmental
     Laws and have not  received  written  notice  of any  liability  under  any
     Environmental Law, and neither Thoratec or any of the Thoratec Subsidiaries
     nor any  portion of the  Thoratec  Real  Property  is in  violation  of any
     Environmental  Law.

          (v)  There is no  civil,  criminal  or  administrative  action,  suit,
     demand,  claim,  complaint,  hearing,  notice of violation,  investigation,
     notice or demand letter,  proceeding or request for information  pending or
     any  liability  (whether  actual  or  contingent)  to  make  good,  repair,
     reinstate  or  clean  up any of the  Thoratec  Real  Property  or any  real
     property previously owned,  leased,  occupied or used by Thoratec or any of
     the Thoratec  Subsidiaries.

          (vi) There has not been any disposal,  spill, discharge, or release of
     any Hazardous  Material  generated,  used, owned,  stored, or controlled by
     Thoratec, any of the Thoratec Subsidiaries,  or respective  predecessors in
     interest,  on, at, or under any Thoratec Real Property,  or by any Thoratec
     Contractor,  and there are no  Hazardous  Materials  located in, at, on, or
     under,  or in the  vicinity of, any such  facility or  property,  or at any
     other  location,  in any such case that could  reasonably  be  expected  to
     require investigation,  removal, remedial, or corrective action by Thoratec
     or any of the  Thoratec  Subsidiaries.



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<PAGE>

          (vii) (A) Other than cleaning and office supplies normally used in the
     operation of an office, Hazardous Materials have not been generated,  used,
     treated,  handled or stored on, or  transported  to or from, or released on
     any Thoratec  Real  Property or, any property  adjoining  any Thoratec Real
     Property;  (B) Thoratec and the Thoratec  Subsidiaries have disposed of all
     wastes,   including  those  wastes  containing  Hazardous   Materials,   in
     compliance with all applicable Environmental Law and Environmental Permits;
     and  (C)  neither  Thoratec  nor  any  of  the  Thoratec  Subsidiaries  has
     transported or arranged for the  transportation of any Hazardous  Materials
     to any  location  that is listed or proposed  for  listing on the  National
     Priorities  List under CERCLA or on the CERCLIS or any  analogous  state or
     country  list or which is the subject of any  environmental  claim.

          (viii) There has not been any underground or above ground storage tank
     or  other  underground   storage  receptacle  or  related  piping,  or  any
     impoundment or other disposal area containing  Hazardous  Materials located
     on any Thoratec Real Property, and no asbestos or polychlorinated biphenyls
     have been used or  disposed  of, or have been  located at, on, or under any
     Thoratec Real Property.

          (ix)  Thoratec  and the Thoratec  Subsidiaries  have taken all actions
     necessary under applicable  requirements of  Environmental  Law to register
     any products or materials  required to be  registered by Thoratec or any of
     the Thoratec  Subsidiaries (or any of their respective agents)  thereunder.


     (c) After a reasonable  investigation  made by Thoratec,  Thoratec has made
available  to TCA all  records  and files,  including,  but not  limited to, all
assessments, reports, studies, audits, analyses, tests and data in possession of
Thoratec and the Thoratec  Subsidiaries  concerning  the  existence of Hazardous
Materials at any Thoratec Real Property or concerning compliance by Thoratec and
the Thoratec Subsidiaries with, or liability under, any Environmental Law.

4.22 Finders or Brokers.  Except for Lehman Brothers Inc.,  whose fees have been
disclosed to TCA, neither Thoratec nor any Thoratec  Subsidiary has employed any
investment banker,  broker, finder or intermediary in connection with any of the
transactions  contemplated  hereby who might be entitled to a fee or  commission
relating to the Merger or any other transaction contemplated by this Agreement.

4.23 Title to and Condition of Property.  Thoratec and the Thoratec Subsidiaries
have good and valid title to all of their  respective  properties,  interests in
properties  and assets,  real and  personal,  reflected in the Thoratec  Balance
Sheet or acquired after the Reference Date, and have valid  leasehold  interests
in all  leased  properties  and  assets,  in each  case  free  and  clear of all
mortgages,  liens,  pledges,  charges or  encumbrances of any kind or character,


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<PAGE>

except  (i)  liens  for  current  taxes  not  yet  due and  payable,  (ii)  such
imperfections  of title,  liens and easements as do not and will not  materially
detract  from or interfere  with the use of the  properties  subject  thereto or
affected thereby, or otherwise  materially impair business operations  involving
such properties,  or (iii) liens securing debt reflected on the Thoratec Balance
Sheet. Schedule 4.23 of the Thoratec Disclosure Statement identifies each parcel
of real  property  owned or  leased  by  Thoratec  or any  Thoratec  Subsidiary.
Thoratec's and the Thoratec  Subsidiaries'  real and tangible  personal property
has been  maintained in accordance  with normal  industry  practice,  is in good
operating  condition  and  repair  (subject  to normal  wear and  tear),  and is
suitable for the purposes for which it is used. 4.24 Officer's Certificate as to
Tax  Matters.  Thoratec  does not know of any  reason  why it will be  unable to
deliver to Heller  Ehrman  White &  McAuliffe  LLP and Hale and Dorr LLP, at the
Closing, an officer's certificate in the form and substance of Exhibit C to this
Agreement.  Thoratec  shall use its best  efforts  to obtain  and  deliver  that
certificate to both of those firms.

4.25  Food and Drug Administration Matters.

     (a) For purposes of this  Agreement,  "FDA Thoratec  Contractor"  means any
Person with which Thoratec or any Thoratec  Subsidiary formerly or presently had
or has any agreement or  arrangement  (whether oral or written) under which that
Person has or had  physical  possession  of, or was or is  obligated to develop,
test,  process,  manufacture or produce,  any FDA Regulated Product on behalf of
Thoratec or any Thoratec Subsidiary.

     (b) Thoratec and each Thoratec Subsidiary  possesses all FDA clearances and
approvals  required  under  all  applicable  FDA  Laws to  conduct  its  current
businesses, to manufacture, hold and sell FDA Regulated Products, and to use and
occupy the Thoratec  Real  Property  (defined in Section  4.21(b)(iv)).  All FDA
clearances and approvals are in full force and effect.

     (c) There are no facts or  circumstances  known to Thoratec that could lead
to any FDA  clearances  or  approvals  possessed  by  Thoratec  or any  Thoratec
Subsidiary being revoked, suspended,  canceled or not renewed. Thoratec and each
Thoratec Subsidiary have submitted all necessary reports and filings to the FDA.

     (d) The execution and delivery of the TCA Agreements,  the  consummation of
the Merger and the other  transactions  contemplated by the TCA Agreements,  and
the exercise by Thoratec and the Thoratec  Subsidiaries of the rights to own and


                                       54
<PAGE>

operate the businesses of Thoratec and the Thoratec  Subsidiaries and to use and
occupy the Thoratec Real Property with respect to the Thoratec Real Property, as
presently  conducted and  operated,  will not affect the validity or require the
transfer of any FDA  clearances  or  approvals  held by Thoratec or any Thoratec
Subsidiary.

     (e)  Thoratec  and the  Thoratec  Subsidiaries  and,  to the  knowledge  of
Thoratec, all previous owners, lessees,  operators and occupants of all Thoratec
Real  Property  with  respect to the  Thoratec  Real  Property,  are in material
compliance with, and have materially  complied with, all applicable FDA Laws and
have not received (or, in the case of such previous owners,  lessees,  operators
and occupants, to the knowledge of Thoratec have not received) any notice of any
non-compliance with any FDA Laws within the past three years.

     (f) There is no civil,  criminal or administrative  action,  suit,  demand,
claim, complaint,  hearing, notice of violation,  investigation,  notice, demand
letter,  proceeding or request for information pending or any liability (whether
actual or  contingent)  to comply with any FDA Laws that  requires any change in
any  manufacturing  procedures  by Thoratec or any  Thoratec  Subsidiary  or the
repair,  reinstatement  or clean-up of any Thoratec Real  Property.  There is no
act,  omission,  event  or  circumstance  of  which  Thoratec  or  any  Thoratec
Subsidiary  has knowledge that may give rise to any such action,  suit,  demand,
claim, complaint, hearing, notice of violation,  investigations,  notice, demand
letter, proceeding or request, or any such liability: (i) against,  involving or
of Thoratec or any  Thoratec  Subsidiary  or (ii)  against,  involving or of any
other Person (including,  without limitation,  any FDA Thoratec Contractor) that
could be imputed or attributed to Thoratec or any Thoratec Subsidiary.

     (g) There has not been any  material  violation of any FDA Laws by Thoratec
or any  Thoratec  Subsidiary  in  their  prior  product  developmental  efforts,
clinical  studies,  submissions  or reports  to the FDA or any other  Government
Entity  (or any  failure  to make any such  submission  or  report)  that  could
reasonably  be  expected  to  require   investigation,   corrective   action  or
enforcement  action.

     (h) Thoratec,  Thoratec  Subsidiaries and their respective agents (in their
capacities as such agents) have registered with the FDA all facilities  required
to be  registered  and have  listed all FDA  Regulated  Products  required to be
listed with the FDA.

4.26  Inventories.  The  inventories  of Thoratec and the Thoratec  Subsidiaries
consist of raw materials and supplies, manufactured and purchased parts, work in
progress and finished  products,  all of which are  merchantable and fit for the
purposes  for  which  they  were  manufactured.  Subject  only  to the  reserves
reflected on the Thoratec Balance Sheet  determined in a manner  consistent with


                                       55
<PAGE>

Thoratec's past practices,  none of those inventories is slow moving,  obsolete,
damaged or defective.



                                    ARTICLE V

                                    COVENANTS



5.1  Conduct of  Business  During  Interim  Period.  Except as  contemplated  or
required by this  Agreement,  as set forth on Schedule 5.1 to the TCA Disclosure
Statement or Schedule 5.1 to the Thoratec Disclosure Statement,  or as expressly
consented  to in  writing by  Thoratec  or TCA,  as the case may be,  during the
period from the date of this Agreement to the earlier of the termination of this
Agreement and the Effective Time, each of TCA and its  Subsidiaries,  on the one
hand, and Thoratec and the Thoratec  Subsidiaries,  on the other hand, shall (i)
conduct its  operations  according  to its ordinary and usual course of business
consistent  with past  practice,  (ii) use  commercially  reasonable  efforts to
preserve intact its business organization, to keep available the services of its
officers and  employees in each business  function and to maintain  satisfactory
relationships with suppliers, distributors, customers and others having business
relationships  with it,  and (iii) not take any  action  which  would  adversely
affect  its  ability  to  consummate  the  Merger  or  the  other   transactions
contemplated  hereby.  Without  limiting the  generality of the  foregoing,  and
except as otherwise  expressly provided in this Agreement,  prior to the earlier
of the termination of this Agreement and the Effective Time, neither TCA nor any
of its  Subsidiaries  will,  without the prior written consent of Thoratec,  and
neither  Thoratec nor any Thoratec  Subsidiary  will,  without the prior written
consent of TCA, directly or indirectly, do any of the following:

     (a) enter into, violate,  extend, amend or otherwise modify or waive any of
the terms of (i) any joint venture,  license, or agreement relating to the joint
development or transfer of technology or TCA IP Rights or Thoratec IP Rights, as
the  case  may be,  or (ii)  except  in the  ordinary  course  of  business  and
consistent with past practice, any other agreements, commitments or contracts;

     (b) split,  combine or  reclassify  any shares of its  capital  stock;

     (c) except as permitted in Section 5.4(e) or (f), as  appropriate,  of this
Agreement,  authorize,  solicit,  propose or announce an intention to authorize,


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<PAGE>

recommend or propose,  or enter into any  agreement in principle or an agreement
with any other Person with respect to, any plan of liquidation  or  dissolution,
any acquisition of a material amount of assets or securities, any disposition of
a  material   amount  of  assets  or   securities,   any   material   change  in
capitalization,   or  any  partnership,   association,   joint  venture,   joint
development,  technology transfer, or other material business alliance;

     (d) fail to renew any insurance policy naming it as a beneficiary or a loss
payee,  or take any  steps or fail to take  any  steps  that  would  permit  any
insurance  policy  naming it as a  beneficiary  or a loss payee to be  canceled,
terminated or materially altered,  except in the ordinary course of business and
consistent  with past practice and following  written notice to Thoratec or TCA,
as the case may be;

     (e)  maintain  its books and records in a manner other than in the ordinary
course of  business  and  consistent  with  past  practice;

     (f) enter into any hedging, option, derivative or other similar transaction
or any foreign exchange  position or contract for the exchange of currency other
than in the ordinary course of business and consistent  with past practice;

     (g) institute any change in its accounting methods, principles or practices
other than as required by GAAP, or the rules and regulations  promulgated by the
SEC, or revalue any assets, including without limitation, writing down the value
of inventory or writing off notes or accounts receivables;

     (h) in respect of any Taxes, make or change any material  election,  change
any accounting  method,  enter into any closing  agreement,  settle any material
claim or  assessment,  or consent to any  extension or waiver of the  limitation
period  applicable  to any material  claim or  assessment  except as required by
applicable law;

     (i)  suspend,  terminate or  otherwise  discontinue  any planned or ongoing
material research and development activities, programs or other such activities;

     (j) issue any capital stock or debt instruments (other than upon conversion
or exercise of existing  options,  warrants or debt  instruments  that have been
disclosed in Section 3.6 or 4.5 of this  Agreement  or the related  schedules to
the related disclosure statements),  or any options, warrants or other rights to
purchase or acquire any capital  stock or debt  instruments;

     (k)  purchase  any  capital  stock  or debt  instruments,  or any  options,
warrants  or other  rights to  purchase  or acquire  any  capital  stock or debt
instruments  or



                                       57
<PAGE>

     (l) take or agree to take, any of the actions described in Section 3.10, in
the case of TCA, or Section 4.11,  in the case of Thoratec,  or any action which
would make any of its representations or warranties  contained in this Agreement
untrue or incorrect or prevent it from performing or cause it not to perform its
covenants hereunder.

5.2 No Solicitation.

     (a) From and after the date of this  Agreement  until the Effective Time or
termination  of this  Agreement  pursuant to Article  VIII,  TEC,  TCA and their
Subsidiaries will not, nor will they authorize or permit any of their respective
officers, directors,  affiliates or employees or any investment banker, attorney
or other  advisor or  representative  retained  by any of them to,  directly  or
indirectly: (i) solicit, initiate, encourage or induce the making, submission or
announcement of any TCA  Acquisition  Proposal (as  hereinafter  defined),  (ii)
participate in any  discussions  or  negotiations  regarding,  or furnish to any
Person any non-public  information  with respect to, or take any other action to
facilitate  any inquiries or the making of any proposal that  constitutes or may
reasonably be expected to lead to, any TCA Acquisition Proposal, (iii) engage in
discussions with any Person with respect to any TCA Acquisition Proposal, except
as to the existence of these provisions,  (iv) approve, endorse or recommend any
TCA  Acquisition  Proposal  or (v) enter  into any  letter of intent or  similar
document or any contract  agreement  or  commitment  contemplating  or otherwise
relating to any TCA  Acquisition  Transaction.  Notwithstanding  anything to the
contrary  contained  in  this  Section  5.2 or in any  other  provision  of this
Agreement,  TEC,  TCA and their  boards of  directors:  (i) may  participate  in
discussions or negotiations with or furnish information to any third party that,
after the date of this Agreement,  makes an unsolicited TCA Acquisition Proposal
(a "TCA Potential  Acquiror") or approve an unsolicited TCA Acquisition Proposal
if the  respective  board  is  advised  by its  financial  advisor  that the TCA
Potential  Acquiror  submitting such TCA Acquisition  Proposal has the financial
wherewithal  to  consummate  that  TCA  Acquisition  Proposal,  and  that  board
determines in good faith (A) after  receiving  written advice from its financial
advisor,  that such TCA Acquisition Proposal is a TCA Superior Offer (as defined
in Section 5.4(e)),  and (B) following  consultation with outside legal counsel,
that the  failure to  participate  in such  discussions  or  negotiations  or to
furnish such  information or approve the TCA Acquisition  Proposal would violate
the board's  fiduciary  duties under  applicable  law and even in the absence of
this Section 5.2. TCA and TEC agree that any non-public information furnished to
a  TCA   Potential   Acquiror  will  be  pursuant  to  a   confidentiality   and
nonsolicitation  agreement containing provisions at least as favorable to TCA as
the  confidentiality  and  nonsolicitation  provisions  of  the  Confidentiality
Agreements (as defined in Section 5.3). If TCA or TEC shall determine to provide
any information as described above, or shall receive a TCA Acquisition Proposal,


                                       58
<PAGE>

it shall promptly,  and in any event within 24 hours, inform Thoratec in writing
as to that fact and shall  furnish to Thoratec the identity of the  recipient of
such information to be provided and/or the TCA Potential  Acquiror and the terms
of such TCA Acquisition Proposal.

     (b) From and after the date of this  Agreement  until the Effective Time or
termination  of this  Agreement  pursuant  to  Article  VIII,  Thoratec  and the
Thoratec  Subsidiaries  will not, nor will they authorize or permit any of their
respective  officers,  directors,  affiliates  or  employees  or any  investment
banker,  attorney or other advisor or representative retained by any of them to,
directly or indirectly: (i) solicit,  initiate,  encourage or induce the making,
submission or announcement of any Thoratec  Acquisition Proposal (as hereinafter
defined),  (ii)  participate in any  discussions or negotiations  regarding,  or
furnish to any Person any  non-public  information  with respect to, or take any
other action to  facilitate  any  inquiries  or the making of any proposal  that
constitutes or may  reasonably be expected to lead to, any Thoratec  Acquisition
Proposal,  (iii)  engage in  discussions  with any  Person  with  respect to any
Thoratec Acquisition  Proposal,  except as to the existence of these provisions,
(iv)  approve,  endorse or recommend  any Thoratec  Acquisition  Proposal or (v)
enter into any letter of intent or similar document or any contract agreement or
commitment  contemplating  or  otherwise  relating to any  Thoratec  Acquisition
Transaction.  Notwithstanding anything to the contrary contained in this Section
5.2 or in any  other  provision  of this  Agreement,  Thoratec  and its board of
directors  may  participate  in  discussions  or  negotiations  with or  furnish
information to any third party that, after the date of this Agreement,  makes an
unsolicited  Thoratec  Acquisition Proposal (a "Thoratec Potential Acquiror") or
approve an unsolicited  Thoratec Acquisition Proposal if the board is advised by
its  financial  advisor that the Thoratec  Potential  Acquiror  submitting  such
Thoratec Acquisition  Proposal has the financial  wherewithal to consummate that
Thoratec Acquisition Proposal, and the board determines in good faith, following
consultation with outside legal counsel, that the failure to participate in such
discussions  or  negotiations  or to furnish  such  information  or approve  the
Thoratec  Acquisition  Proposal would violate the board's fiduciary duties under
applicable law and even in the absence of this Section 5.2. Thoratec agrees that
any non-public  information  furnished to a Thoratec  Potential Acquiror will be
pursuant  to  a  confidentiality   and  nonsolicitation   agreement   containing
provisions  at  least  as  favorable  to  Thoratec  as the  confidentiality  and
nonsolicitation  provisions  of the  Confidentiality  Agreements  (as defined in
Section  5.3).  If  Thoratec  shall  determine  to provide  any  information  as
described above, or shall receive any Thoratec  Acquisition  Proposal,  it shall
promptly,  and in any event within 24 hours, inform TCA and TEC in writing as to


                                       59
<PAGE>

that fact and shall furnish to TCA and TEC the identity of the recipient of such
information to be provided and/or the Thoratec  Potential Acquiror and the terms
of such Thoratec Acquisition Proposal.

     (c) For purposes of this Agreement,  "TCA  Acquisition  Proposal" means any
offer or proposal (other than an offer or proposal by Thoratec)  relating to any
TCA Acquisition  Transaction.  For purposes of this Agreement,  "TCA Acquisition
Transaction" means any transaction or series of related transactions  involving:
(A) any purchase  from TCA or  acquisition  by any person or "group" (as defined
under  Section  13(d)  of  the  Exchange  Act  and  the  rules  and  regulations
thereunder)  of  more  than a 15%  interest  in  the  total  outstanding  voting
securities  of TCA or any tender  offer or  exchange  offer that if  consummated
would  result in any person or "group" (as defined  under  Section  13(d) of the
Exchange Act and the rules and regulations  thereunder)  beneficially owning 15%
or  more  of the  total  outstanding  voting  securities  of TCA or any  merger,
consolidation,  business  combination or similar transaction  involving TCA; (B)
any sale,  lease  (other than in the  ordinary  course of  business),  exchange,
transfer,  license (other than in the ordinary course of business),  acquisition
or disposition  of more than 15% of the assets of TCA or (C) any  liquidation or
dissolution of TCA.

     (d) For purposes of this Agreement,  "Thoratec  Acquisition Proposal" means
any offer or proposal  relating to any  Thoratec  Acquisition  Transaction.  For
purposes  of  this  Agreement,  "Thoratec  Acquisition  Transaction"  means  any
transaction or series of related transactions  involving:  (A) any purchase from
Thoratec or acquisition by any person or "group" (as defined under Section 13(d)
of the Exchange Act and the rules and regulations thereunder) of more than a 15%
interest in the total  outstanding  voting  securities of Thoratec or any tender
offer or  exchange  offer  that if  consummated  would  result in any  person or
"group" (as defined  under  Section  13(d) of the Exchange Act and the rules and
regulations thereunder) beneficially owning 15% or more of the total outstanding
voting securities of Thoratec or any merger, consolidation, business combination
or similar transaction  involving  Thoratec;  (B) any sale, lease (other than in
the ordinary course of business), exchange, transfer, license (other than in the
ordinary course of business), acquisition or disposition of more than 15% of the
assets of Thoratec or (C) any  liquidation or  dissolution  of Thoratec.

     (e) In  addition  to the  obligations  of TCA and TEC set forth in  Section
5.2(a),  TCA and TEC as promptly as practicable shall advise Thoratec orally and
in  writing  of any TCA  Acquisition  Proposal  or any  request  for  non-public
information or inquiry which TCA or TEC reasonably  believes would lead to a TCA
Acquisition Proposal or to any TCA Acquisition  Transaction,  the material terms
and conditions of such TCA  Acquisition  Proposal,  request or inquiry,  and the


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identity of the Person or group making any such TCA Acquisition  Proposal or any
amendment or modification  thereto,  request or inquiry.  TCA and TEC shall keep
Thoratec  informed as promptly as  practicable  in all material  respects of the
status  and  details  (including   material   amendments  or  proposed  material
amendments) of any such TCA  Acquisition  Proposal,  request or inquiry.

     (f) In addition to the obligations of Thoratec set forth in Section 5.2(b),
Thoratec  as  promptly  as  practicable  shall  advise TCA and TEC orally and in
writing of any  Thoratec  Acquisition  Proposal or any  request  for  non-public
information  or  inquiry  which  Thoratec  reasonably  believes  would lead to a
Thoratec Acquisition Proposal or to any Thoratec  Acquisition  Transaction,  the
material  terms and  conditions  of such  Thoratec  Acquisition  Proposal or any
amendments or modifications thereto, request or inquiry, and the identity of the
Person or group  making  any such  Thoratec  Acquisition  Proposal,  request  or
inquiry.

5.3 Access to  Information.  From the date of this Agreement until the Effective
Time,  TCA and  Thoratec  shall  each  afford to the other and their  authorized
representatives  (including  counsel,  consultants,  accountants,  auditors  and
agents)  reasonable  access during  normal  business  hours and upon  reasonable
notice to all of its facilities,  personnel and operations and to all of its and
its  Subsidiaries  books and records,  shall permit the other and its authorized
representatives to conduct  inspections as they may reasonably request and shall
instruct its officers and those of its Subsidiaries to furnish such persons with
such  financial and  operating  data and other  information  with respect to its
business  and  properties  as they may  from  time to time  reasonably  request,
subject to the restrictions set forth in the Confidentiality Agreements dated as
of  March  15,  2000  and  July  26,  2000   between   Thoratec   and  TCA  (the
"Confidentiality Agreements").

5.4   Special Meetings; Registration Statement; Board Recommendations.

     (a) TCA Special Meeting.  Promptly after the date hereof, TCA will take all
action  necessary  in  accordance  with  Massachusetts  Law and its  Articles of
Organization  and bylaws to convene a meeting of TCA's  stockholders to consider
adoption  and  approval of this  Agreement  and approval of the Merger (the "TCA
Special  Meeting") to be held as promptly as  practicable,  and in any event (to
the  extent   permissible  under  applicable  law)  within  45  days  after  the
declaration of effectiveness of the Registration  Statement.  Subject to Section
5.4(e),  TCA will use its  commercially  reasonable  efforts to solicit from its
stockholders proxies in favor of the adoption and approval of this Agreement and
the approval of the Merger and will take all other action necessary or advisable
to secure the vote or consent of its  stockholders  required by the rules of the


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American  Stock  Exchange  or  Massachusetts   Law  to  obtain  such  approvals.
Notwithstanding  anything to the contrary  contained in this Agreement,  TCA may
adjourn or postpone  the TCA Special  Meeting to the extent  necessary to ensure
that   any   necessary    supplement   or   amendment   to   the   Joint   Proxy
Statement/Prospectus  is provided to TCA's  stockholders in advance of a vote on
the Merger and this  Agreement  or, if as of the time for which the TCA  Special
Meeting   is   originally   scheduled   (as  set  forth  in  the   Joint   Proxy
Statement/Prospectus)   there  are  insufficient  shares  of  TCA  Common  Stock
represented  (either in person or by proxy) to constitute a quorum  necessary to
conduct the business of the TCA Special  Meeting.  TCA shall ensure that the TCA
Special Meeting is called, noticed,  convened, held and conducted,  and that all
proxies  solicited  by TCA in  connection  with  the  TCA  Special  Meeting  are
solicited,   in  compliance  with  the  Massachusetts  Law,  TCA's  Articles  of
Organization and bylaws,  the rules of the American Stock Exchange and all other
applicable legal requirements. TCA's obligation to call, give notice of, convene
and hold the TCA Special  Meeting in accordance  with this Section  5.4(a) shall
not  be  limited  to or  otherwise  affected  by the  commencement,  disclosure,
announcement  or submission to TCA of any TCA  Acquisition  Proposal,  or by any
withdrawal,  amendment or  modification  of the  recommendation  of the board of
directors of TCA with respect to the Merger or this Agreement.

     (b) Thoratec Special Meeting. Promptly after the date hereof, Thoratec will
take all action  necessary in accordance with California Law and its articles of
incorporation  and  bylaws to convene a meeting of  Thoratec's  shareholders  to
consider  the  issuance of Thoratec  Common  Stock in the Merger (the  "Thoratec
Special  Meeting") to be held as promptly as  practicable,  and in any event (to
the  extent   permissible  under  applicable  law)  within  45  days  after  the
declaration of effectiveness of the Registration  Statement.  Subject to Section
5.4(f),  Thoratec will use its commercially  reasonable  efforts to solicit from
its  shareholders  proxies in favor of the issuance of Thoratec  Common Stock in
the Merger and will take all other  action  necessary or advisable to secure the
vote  or  consent  of its  shareholders  required  by the  rules  of  Nasdaq  or
California Law to obtain such approval. Notwithstanding anything to the contrary
contained  in this  Agreement,  Thoratec  may adjourn or postpone  the  Thoratec
Special Meeting to the extent necessary to ensure that any necessary  supplement
or amendment to the Joint Proxy  Statement/Prospectus  is provided to Thoratec's
shareholders  in advance of a vote on the  issuance of Thoratec  Common Stock in
the  Merger  and this  Agreement  or, if as of the time for  which the  Thoratec
Special  Meeting  is  originally  scheduled  (as set  forth in the  Joint  Proxy
Statement/Prospectus)  there are  insufficient  shares of Thoratec  Common Stock
represented  (either in person or by proxy) to constitute a quorum  necessary to



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conduct the business of the Thoratec Special Meeting. Thoratec shall ensure that
the Thoratec Special Meeting is called,  noticed,  convened, held and conducted,
and that all  proxies  solicited  by Thoratec in  connection  with the  Thoratec
Special Meeting are solicited, in compliance with the California Law, Thoratec's
articles  of  incorporation  and  bylaws,  the  rules of  Nasdaq  and all  other
applicable legal  requirements.  Thoratec's  obligation to call, give notice of,
convene and hold the Thoratec  Special  Meeting in accordance  with this Section
5.4(b)  shall not be  limited  to or  otherwise  affected  by the  commencement,
disclosure,  announcement or submission to Thoratec of any Thoratec  Acquisition
Proposal, or by any withdrawal,  amendment or modification of the recommendation
of the board of directors  of Thoratec  with respect to the issuance of Thoratec
Common  Stock in the  Merger.

     (c)  Subject to Section  5.4(e):  (i) the board of  directors  of TCA shall
recommend  that TCA's  stockholders  vote in favor of and adopt and approve this
Agreement  and  approve the Merger at the TCA  Special  Meeting;  (ii) the Joint
Proxy  Statement/Prospectus  shall  include a  statement  to the effect that the
board of directors of TCA has recommended that TCA's  stockholders vote in favor
of and  adopt and  approve  this  Agreement  and the  Merger at the TCA  Special
Meeting;  and (iii)  neither  the board of  directors  of TCA nor any  committee
thereof  shall  withdraw,  amend or modify,  or propose or resolve to  withdraw,
amend or modify in a manner adverse to Thoratec, the recommendation of the board
of  directors  of TCA that  TCA's  stockholders  vote in favor of and  adopt and
approve this Agreement and the Merger.

     (d) Subject to Section 5.4(f): (i) the board of directors of Thoratec shall
recommend that Thoratec's shareholders vote in favor of the issuance of Thoratec
Common Stock in the Merger at the Thoratec Special Meeting; (ii) the Joint Proxy
Statement/Prospectus  shall  include a statement to the effect that the board of
directors of Thoratec has recommended that Thoratec's shareholders vote in favor
of the issuance of Thoratec  Common Stock in the Merger at the Thoratec  Special
Meeting;  and (iii) neither the board of directors of Thoratec nor any committee
thereof  shall  withdraw,  amend or modify,  or propose or resolve to  withdraw,
amend or modify in a manner  adverse to TCA, the  recommendation  of  Thoratec's
board of directors of Thoratec that Thoratec's shareholders vote in favor of the
issuance of Thoratec  Common Stock in the Merger.

     (e) Nothing in this  Agreement  shall prevent the board of directors of TCA
from withholding, withdrawing, amending or modifying its recommendation in favor
of the Merger if (i) a TCA Superior  Offer (as defined below) is made to TCA and
is not  withdrawn,  (ii) TCA shall have provided  written  notice to Thoratec (a
"Notice of TCA Superior  Offer")  advising  Thoratec that TCA has received a TCA
Superior  Offer,  specifying  the  material  terms  and  conditions  of such TCA
Superior  Offer and  identifying  the Person or entity  making such TCA Superior
Offer,  (iii) Thoratec  shall not have,  within five business days of Thoratec's


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<PAGE>

receipt of the Notice of TCA Superior Proposal, made an offer that the TCA board
of directors by a majority vote  determines in its good faith judgment (based on
the written  advice of its  financial  advisor) to be at least as  favorable  to
TCA's  stockholders  as such TCA  Superior  Offer (it being  agreed that the TCA
board of  directors  shall  convene  a meeting  to  consider  any such  offer by
Thoratec promptly following the receipt thereof), (iv) the board of directors of
TCA concludes in good faith, after consultation with its outside counsel,  that,
in light of such TCA Superior Offer, the withholding,  withdrawal,  amendment or
modification  of such  recommendation  is  required  in order  for the  board of
directors of TCA to comply with its fiduciary  obligations to TCA's stockholders
under applicable law and (v) TCA shall not have violated any of the restrictions
set forth in Section 5.2 or this Section 5.4(e). TCA shall provide Thoratec with
at least  three  business  days prior  notice (or such  lesser  prior  notice as
provided to the members of TCA's board of directors but in no event less than 24
hours) of any  meeting  of TCA's  board of  directors  at which  TCA's  board of
directors is reasonably  expected to consider any TCA  Acquisition  Transaction.
Subject to applicable laws, nothing contained in this Section 5.4(e) shall limit
TCA's  obligation  to hold and convene the TCA Special  Meeting  (regardless  of
whether  the  recommendation  of the board of  directors  of TCA shall have been
withdrawn,  amended or modified). For purposes of this Agreement,  "TCA Superior
Offer" means an  unsolicited,  bona fide written  offer made by a third party to
consummate  any of the  following  transactions:  (i) a merger or  consolidation
involving TCA pursuant to which the  stockholders of TCA  immediately  preceding
such  transaction  hold less than a  majority  of the  equity  interests  in the
surviving or resulting entity of such transaction or (ii) the acquisition by any
Person or group  (including  by way of a tender offer or an exchange  offer or a
two-step   transaction   involving  a  tender  offer  followed  with  reasonable
promptness by a cash-out merger, directly or indirectly, of ownership of 100% of
the then  outstanding  shares of capital stock of TCA on terms that the board of
directors of TCA determines, in its reasonable good faith judgment (based on the
written  advice  of its  financial  advisor)  to be  more  favorable  to the TCA
stockholders  than the terms of the Merger,  provided  that any such offer shall
not be  deemed  to be a  "TCA  Superior  Offer"  if any  financing  required  to
consummate the transaction  contemplated  by such offer is not fully  committed.


     (f)  Nothing in this  Agreement  shall  prevent the board of  directors  of
Thoratec from withholding, withdrawing, amending or modifying its recommendation
in favor of the  issuance  of  Thoratec  Common  Stock  in the  Merger  if (i) a
Thoratec  Superior  Offer  (as  defined  below) is made to  Thoratec  and is not
withdrawn,  (ii) Thoratec  shall have provided  written notice to TCA and TEC (a
"Notice of Thoratec  Superior  Offer")  advising  TCA and TEC that  Thoratec has
received a Thoratec Superior Offer, specifying the material terms and conditions
of such Thoratec Superior Offer and identifying the Person or entity making such
Thoratec Superior Offer,  (iii) the board of directors of Thoratec  concludes in


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good faith, after consultation with its outside counsel,  that, in light of such
Thoratec Superior Offer, the withholding,  withdrawal, amendment or modification
of such  recommendation  is  required  in order  for the board of  directors  of
Thoratec to comply with its fiduciary  obligations  to  Thoratec's  shareholders
under  applicable  law and (iv)  Thoratec  shall  not have  violated  any of the
restrictions  set forth in Section 5.2 or this Section  5.4(f).  Thoratec  shall
provide  TCA and TEC with at least  three  business  days prior  notice (or such
lesser prior notice as provided to the members of Thoratec's  board of directors
but in no event  less than 24  hours)  of any  meeting  of  Thoratec's  board of
directors  at which  Thoratec's  board of directors  is  reasonably  expected to
consider any  Thoratec  Acquisition  Transaction.  Subject to  applicable  laws,
nothing  contained in this Section 5.4(f) shall limit  Thoratec's  obligation to
hold and  convene  the  Thoratec  Special  Meeting  (regardless  of whether  the
recommendation  of the board of directors of Thoratec shall have been withdrawn,
amended or modified). For purposes of this Agreement,  "Thoratec Superior Offer"
means  an  unsolicited,  bona  fide  written  offer  made  by a third  party  to
consummate  any of the  following  transactions:  (i) a merger or  consolidation
involving  Thoratec  pursuant to which the shareholders of Thoratec  immediately
preceding such  transaction hold less than a majority of the equity interests in
the surviving or resulting entity of such transaction or (ii) the acquisition by
any Person or group  (including by way of a tender offer or an exchange offer or
a  two-step  transaction  involving  a tender  offer  followed  with  reasonable
promptness by a cash-out merger, directly or indirectly, of ownership of 100% of
the then outstanding shares of capital stock of Thoratec on terms that the board
of directors  of Thoratec  determines,  in its  reasonable  good faith  judgment
(based on the written  advice of its financial  advisor) to be more favorable to
the Thoratec  shareholders than the terms of the Merger,  provided that any such
offer shall not be deemed to be a  "Thoratec  Superior  Offer" if any  financing
required to consummate the  transaction  contemplated by such offer is not fully
committed.

     (g) Nothing in this Agreement  shall prohibit TCA or its board of directors
or  Thoratec  or its  board of  directors  from  taking  and  disclosing  to its
stockholders  a position  contemplated  by Rules 14d-9 and 14e-2(a)  promulgated
under the Exchange  Act.

     (h) As promptly as practicable  after the execution of this Agreement,  TCA
and  Thoratec  shall  mutually  prepare,  and TCA  shall  file  with the SEC,  a
preliminary  form  of the  Joint  Proxy  Statement/Prospectus.  As  promptly  as
practicable  following  receipt of SEC comments on such preliminary  Joint Proxy
Statement/Prospectus, Thoratec and TCA shall mutually prepare a response to such
comments. Upon resolution of all comments,  Thoratec shall file the Registration


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<PAGE>

Statement with the SEC.  Thoratec and TCA shall use all commercially  reasonable
efforts to have the preliminary Joint Proxy Statement/Prospectus  cleared by the
SEC and the Registration  Statement declared effective by the SEC as promptly as
practicable.  Thoratec  shall also take any action  required  to be taken  under
applicable  state blue sky or securities laws in connection with Thoratec Common
Stock to be issued in exchange for the shares of TCA Common Stock.  Thoratec and
TCA shall promptly  furnish to each other all  information,  and take such other
actions  (including,  without  limitation,  using  all  commercially  reasonable
efforts  to  provide  any  required  consents  of their  respective  independent
auditors),  as may reasonably be requested in connection  with any action by any
of them in  connection  with the  preceding  sentences of this  Section  5.4(h).
Whenever any party learns of the occurrence of any event which is required to be
set forth in an amendment or supplement to the Joint Proxy Statement/Prospectus,
the  Registration  Statement or any other  filing made  pursuant to this Section
5.4(h),  Thoratec or TCA, as the case may be, shall promptly inform the other of
such occurrence and cooperate in filing with the SEC or its staff and/or mailing
of such amendment or supplement to the stockholders of TCA, Thoratec or both, as
appropriate.

     (i) Subject to Section 5.4(e), the Joint Proxy  Statement/Prospectus  shall
contain  the  recommendation  of the board of  directors  of TCA in favor of the
approval and adoption of the Merger and this  Agreement.

     (j) Subject to Section 5.4(f), the Joint Proxy  Statement/Prospectus  shall
contain the recommendation of the board of directors of Thoratec in favor of the
issuance  of  Thoratec  Common  Stock in the  Merger.

     (k) Subject to the next sentence, TEC shall vote (or cause to be voted) all
the shares of TCA Common  Stock held  directly or  indirectly  by it in favor of
this Agreement and the Merger at the TCA Special Meeting and any adjournments or
postponements  thereof.  However,  TEC shall be excused from that obligation if,
but  only  if,  the  TCA  board  of  directors   withholds   or  withdraws   its
recommendation  in accordance with Section 5.4(e).

5.5 Commercially Reasonable Efforts.

     (a) Subject to the terms and conditions herein provided,  Thoratec,  Merger
Sub, TEC and TCA shall use their  commercially  reasonable  efforts to take,  or
cause  to be  taken,  all  actions  and do,  or cause  to be  done,  all  things
necessary,  proper or appropriate  under this  Agreement and applicable  laws to
consummate and make effective the  transactions  contemplated by this Agreement,
including,  without  limitation:

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          (i) entering into or causing their  appropriate  Subsidiaries to enter
     into  the  agreements  required  to  be  entered  into  by  them  or  those
     Subsidiaries as referenced in Sections 7.1 and 7.2 of this Agreement,  (ii)
     satisfying the other conditions to closing set forth in those sections over
     which they have control or influence,  (iii) promptly  filing  Notification
     and Report Forms under the HSR Act with the Federal Trade  Commission  (the
     "FTC")  and the  Antitrust  Division  of the  Department  of  Justice  (the
     "Antitrust  Division")  and  responding as promptly as  practicable  to any
     inquiries  received from the FTC or the Antitrust  Division for  additional
     information or documentation, (iv) using commercially reasonable efforts to
     obtain all necessary governmental and private party consents,  approvals or
     waivers,  and (v) using  commercially  reasonable efforts to lift any legal
     bar to the Merger.

     (b)  Notwithstanding  anything to the contrary in this  Agreement,  none of
Thoratec,  TCA or any of their respective  Subsidiaries shall be required to (i)
divest, hold separate or license any business, product line or assets, (ii) take
any action or accept any limitation that could  reasonably be expected to have a
Thoratec Material Adverse Effect or a TCA Material Adverse Effect or (iii) agree
to any of the foregoing in order to effect or facilitate the Merger.

5.6 Public  Announcements.  Before issuing any press release or otherwise making
any public statement with respect to the Merger or any of the other transactions
contemplated hereby,  Thoratec,  Merger Sub, TEC and TCA shall consult with each
other  as to its form and  substance,  and  agree  not to issue  any such  press
release or general communication to employees or make any public statement prior
to obtaining the consent of the others (which shall not be unreasonably withheld
or  delayed),  except as may be required by  applicable  law or by the rules and
regulations of or listing  agreement with Nasdaq,  The American Stock  Exchange,
the New York Stock  Exchange or as may  otherwise  be  required  by Nasdaq,  The
American Stock Exchange, the New York Stock Exchange or the SEC.

5.7 Notification of Certain Matters. TCA and TEC shall promptly notify Thoratec,
and  Thoratec  shall  promptly   notify  TCA  and  TEC,  of  the  occurrence  or
non-occurrence of any event the respective occurrence or non-occurrence of which
would be likely to cause any condition to the obligations of the notifying party
to effect the Merger not to be  fulfilled.  TCA and TEC shall give prompt notice
to  Thoratec,  and  Thoratec  shall give  prompt  notice to TCA and TEC,  of any
communication from any Person alleging that the consent of such Person is or may
be required in  connection  with the Merger or other  transactions  contemplated
hereby.



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5.8 Indemnification.

     (a) The articles of  organization  and bylaws of the Surviving  Corporation
shall contain, and Thoratec shall cause the Surviving Corporation to fulfill and
honor, the provisions with respect to  indemnification  and exculpation that are
substantially  identical to those set forth in the articles of organization  and
bylaws of TCA as of the date of this Agreement,  which  provisions  shall not be
amended,  repealed  or  otherwise  modified  for a period of six years  from the
Effective Time in any manner that would adversely  affect the rights  thereunder
of any of the  Indemnified  Parties.  In addition,  Thoratec shall guarantee the
obligations of TCA pursuant to any  indemnification  agreements  between TCA and
any of the Indemnified Parties.  "Indemnified Parties" shall include each person
who is or was a director or officer of TCA or any  Subsidiary of TCA at any time
before the Effective  Time, and each person who serves or has in the past served
at the request of TCA or any subsidiary of TCA as a director,  officer, trustee,
partner, fiduciary, employee or agent of another corporation, partnership, joint
venture, trust, pension or other employee benefit plan or enterprise at any time
before the Effective  Time.  Notwithstanding  the foregoing,  Thoratec's and the
Surviving Corporation's  obligations set forth in this Section 5.8(a) are in all
respects  conditioned  upon TEC's  performance of its  obligations  set forth in
Section 5.8(b).

     (b) For a period of six years after the Effective  Time, TEC shall maintain
in effect directors' and officers'  liability  insurance  covering those persons
who are (as of the Closing) or at any time before the Closing were  directors or
officers of TCA or any of TCA's Subsidiaries on terms comparable to those of the
directors' and officers' liability insurance policy currently maintained by TEC.
Thoratec shall  reimburse TEC for the costs of that policy not to exceed $75,000
per year.

     (c) Each Indemnified Party shall comply with the reasonable requests of the
Surviving Corporation or Thoratec in defending or settling any action hereunder,
provided  that no proposed  settlement  of any such action need be considered by
any  Indemnified  Party  unless  (A) such  settlement  involves  no  finding  or
admission of any  liability by any  Indemnified  Party,  and (B) the sole relief
provided in connection with such settlement is monetary damages that are paid in
full  by the  Surviving  Corporation  or  Thoratec.

5.9 Affiliate  Agreements.  Concurrently with the execution and delivery hereof,
TCA shall  deliver to Thoratec a list  (reasonably  satisfactory  to counsel for
Thoratec), setting forth the names of all persons who are expected to be, at the
Effective  Time,  in TCA's  reasonable  judgment,  Affiliates  of TCA. TCA shall
furnish such  information  and documents as Thoratec may reasonably  request for


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the purpose of reviewing  such list.  TCA shall  deliver a written  agreement in
substantially  the  form of  Exhibit  D  hereto  (a "TCA  Affiliate  Agreement")
executed by each person (other than TEC)  identified as an Affiliate in the list
furnished  pursuant to this  Section 5.9 within ten days after the  execution of
this Agreement.

5.10 Nasdaq  Listing.  Prior to the  Effective  Time,  Thoratec  shall file with
Nasdaq a  notification  form for listing  additional  shares with respect to the
shares of Thoratec Common Stock issuable,  and those required to be reserved for
issuance,  in  connection  with the Merger.

5.11  Resignation of Directors and Officers.  Without  prejudice to TEC's rights
under the Shareholder  Agreement,  prior to the Effective Time TCA shall deliver
to Thoratec at no cost the  resignations  of such  directors and officers of TCA
and its  Subsidiaries as Thoratec shall specify at least ten business days prior
to the Closing, effective at the Effective Time.

5.12  Consents of  Thoratec's  and TCA's  Accountants.  Each of Thoratec and TCA
shall use commercially  reasonable efforts to cause its independent  accountants
to deliver  to  Thoratec  a  consent,  dated the date on which the  Registration
Statement shall become  effective,  in form reasonably  satisfactory to Thoratec
and  customary  in scope and  substance  for consents  delivered by  independent
public  accountants in connection with the Registration  Statement and the Joint
Proxy  Statement/Prospectus.

5.13  Ancillary  Agreements.  Concurrently  with the execution  hereof,  TEC and
Thoratec  are  executing  and  delivering  the  Shareholder  Agreement  and  the
Registration  Rights  Agreement.

5.14 Form S-8. No later than 10 days after the Effective  Time,  Thoratec  shall
file with the SEC a  Registration  Statement,  on Form S-8 or other  appropriate
form under the Securities  Act, to register  Thoratec Common Stock issuable upon
exercise of the Thoratec Exchange Options.

5.15 SEC Filings.

     (a) TCA will deliver  promptly to Thoratec true and complete copies of each
report, registration statement or statement mailed by it to its security holders
generally  or  filed by it with the SEC,  in each  case  subsequent  to the date
hereof and prior to the  Effective  Time.  As of their  respective  dates,  such
reports,  including the consolidated  financial statements included therein, and
statements  (excluding any  information  therein  provided by Thoratec or Merger
Sub,  as to which TCA  makes no  representation)  will not  contain  any  untrue


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<PAGE>

statement  of a material  fact or omit to state a material  fact  required to be
stated  therein or necessary  to make the  statements  therein,  in light of the
circumstances  under which they are made,  not misleading and will comply in all
material  respects  with  all  applicable  requirements  of  law.  Each  of  the
consolidated  financial statements  (including,  in each case, any related notes
thereto) contained in such reports,  (x) shall comply as to form in all material
respects with applicable  accounting  requirements  and with the published rules
and  regulations  of the SEC with  respect  thereto,  (y) shall be  prepared  in
accordance  with GAAP  applied on a  consistent  basis  throughout  the  periods
involved  (except as may be  indicated  in the notes  thereto or, in the case of
unaudited interim financial  statements,  as may be permitted by the SEC on Form
10-Q under the  Exchange  Act) and (z) shall  fairly  present  the  consolidated
financial  position of TCA and its  Subsidiaries in all material  respects as of
the respective dates thereof and the consolidated  results of its operations and
cash  flows  for the  periods  indicated,  except  that  the  unaudited  interim
financial  statements  were or are  subject  to normal  and  recurring  year-end
adjustments which were not, or are not expected to be, material in amount.

     (b) Thoratec will deliver  promptly to TCA true and complete copies of each
report,  registration statement and other statement mailed by it to its security
holders  generally or filed by it with the SEC, in each case  subsequent  to the
date hereof and prior to the Effective Time. As of their respective  dates, such
reports,  including the consolidated  financial statements included therein, and
statements  (excluding  any  information  therein  provided  by TCA, as to which
Thoratec  makes no  representation)  will not contain any untrue  statement of a
material fact or omit to state a material fact required to be stated  therein or
necessary to make the statements  therein,  in light of the circumstances  under
which they are made,  not  misleading  and will comply in all material  respects
with all  applicable  requirements  of law. Each of the  consolidated  financial
statements  (including,  in each case, any related notes  thereto)  contained in
such  reports  (x)  shall  comply  as to  form  in all  material  respects  with
applicable accounting  requirements and with the published rules and regulations
of the SEC with respect  thereto,  (y) shall be prepared in accordance with GAAP
applied on a consistent  basis throughout the periods involved (except as may be
indicated in the notes  thereto or, in the case of unaudited  interim  financial
statements,  as may be permitted by the SEC on Form 10-Q under the Exchange Act)
and (z) shall fairly present the consolidated financial position of Thoratec and
the Thoratec  Subsidiaries in all material  respects as of the respective  dates
thereof and the  consolidated  results of its  operations and cash flows for the
periods indicated,  except that the unaudited interim financial  statements were
or are subject to normal and recurring  year-end  adjustments which were not, or
are not expected to be, material in amount.

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<PAGE>

5.16 Employee Benefit Matters.

     (a) With respect to the "401(k) plan"  maintained by TEC in which employees
of TCA and its Subsidiaries  participate,  effective as of the Closing TEC shall
cause the accrued  benefits of such employees under that plan to be fully vested
and  immediately  distributable  to or on behalf of those  employees to the full
extent  permitted by law. As soon as  practicable  after the  Closing,  Thoratec
shall  cause  the  employees  of TCA  and its  Subsidiaries  to be  eligible  to
participate  in the  401(k)  plan  maintained  by  Thoratec  and to  allow  such
employees to elect to roll over their  distributable  accrued benefits under the
401(k)  plan  maintained  by  TEC,  including  any  outstanding  loans  of  such
employees, to Thoratec's 401(k) plan.

     (b) The current  severance policy of TCA and its Subsidiaries  with respect
to their employees is set forth in the TCA Employee Policy and Procedure  Manual
(the January 2000 version,  as modified September 27, 2000), a copy of which has
been provided to Thoratec.  After the Closing,  Thoratec shall cause TCA and the
Subsidiaries  of TCA  to  honor  that  policy  for  qualifying  terminations  of
employment,  occurring  within 12 months after the  Closing,  of persons who are
employed by TCA or any such Subsidiary just before the Closing.  Nothing in this
Section  5.16(b)  shall  in  any  manner  diminish  TCA's  Parent's  obligations
referenced  in  Section  3.14(f).

     (c)  With  respect  to  the  participation  of  employees  of TCA  and  its
Subsidiaries  in the  Thoratec  Welfare  Plans,  Thoratec  shall (i) cause to be
waived any pre-existing condition limitations,  (ii) give effect, in determining
any deductible and maximum  out-of-pocket  limitations,  to claims  incurred and
amounts  paid by, and amounts  reimbursed  to, such  employees  with  respect to
similar  plans  maintained  by TCA  immediately  before  the  Closing  and (iii)
recognize all credited service for purposes of eligibility and level of benefits
to the same extent such service was recognized under similar plans maintained by
TCA immediately before the Closing. Thoratec shall make appropriate arrangements
to allow the use by TCA  employees of any accrued  benefits  under any cafeteria
plan (as defined in Section 125 of the Code) which was  maintained by TCA or any
of its Subsidiaries for such employees.

     (d) Thoratec shall provide any required notice under the Worker  Adjustment
and Retraining  Notification  Act and any other  applicable law and to otherwise
comply  with any such  statute  with  respect  to any "plant  closing"  or "mass
layoff" (as defined in that act) or similar event affecting  employees of TCA or
any TCA Subsidiary and occurring  after the Closing.



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<PAGE>

     (e) Thoratec shall provide any required  notice under COBRA for any persons
employed by TCA or any Subsidiary of TCA.

5.17  Notification of Certain  Matters.  TCA and TEC shall give prompt notice to
Thoratec,  and  Thoratec  shall give  prompt  notice to TCA and TEC,  of (i) the
occurrence or  nonoccurrence  of any event the  occurrence or  nonoccurrence  of
which would be likely to cause any  representation or warranty contained in this
Agreement to be untrue or inaccurate in any material  respect at or prior to the
Effective Time, (ii) any material failure of the TCA or TEC,  Thoratec or Merger
Sub, as the case may be, to comply with or satisfy any  covenant,  condition  or
agreement to be complied with or satisfied by it hereunder,  (iii) any notice or
other communication from any third party alleging that the consent of such third
party is or may be required in connection with any  transaction  contemplated by
this Agreement,  or (iv) any facts or circumstances  arise that could reasonably
be expected to result in an TCA Material  Adverse Effect or a Thoratec  Material
Adverse Effect, as the case may be.

5.18 Relinquishment of Name. Within 60 days after the Closing,  TCA shall cease,
and  shall  cause its  Subsidiaries  to cease,  using the name  "Thermo"  or any
confusingly  similar name in its business and operations.  However,  TCA and its
Subsidiaries shall not be required to remove the "Thermo" name from any products
or  product  components  that are in  inventory  as of the  Closing  or that are
completed within one year after the Closing.  Nothing in this Section 5.18 shall
require  that TCA or any  Subsidiary  of TCA cancel  any order for any  product,
product  component,  literature or other item that  includes the "Thermo"  name,
placed  before the  Closing,  if its doing so would  constitute  a breach of any
obligation  or result in any  requirement  to pay any  material  termination  or
cancellation fee. Without time limit,  Thoratec, TCA and the Subsidiaries of TCA
shall be  permitted  to explain  that TCA is the same  company that was formerly
named "Thermo  Cardiosystems  Inc." and that TCA's Subsidiaries are subsidiaries
of that company.

5.19  Special  Retention  Agreements.  Upon  request by Thoratec  including,  if
Thoratec  so  requests,  promptly  after this  Agreement  is  signed,  TCA shall
cooperate with Thoratec:  (a) to adopt a written retention plan, containing such
terms and conditions as Thoratec shall prescribe (subject to the consent of TCA,
which Thoratec  shall not  unreasonably  withhold),  for the benefit of those of
TCA's and TCA's  Subsidiaries' key employees whom Thoratec identifies with TCA's
assistance,  under which (subject to whatever  further  conditions  Thoratec may
prescribe)  rights will vest if and when the Merger closes and (b) shall deliver
a copy of that plan to those employees.



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<PAGE>

5.20  Cooperation in Tax Matters.  Until the applicable  statutes of limitations
(including any extensions) have expired, TEC and TCA shall each: (i) provide the
other with such  assistance  as the other may  reasonably  request in connection
with the  preparation  or amendment of any Tax Return or in connection  with any
audit  or  other  examination  by  any  taxing  authority  or  any  judicial  or
administrative  proceedings  relating to liability for any Taxes  respecting any
period  ending on or before the  Closing  Date or that  otherwise  includes  the
Closing  Date,  (ii)  retain and  provide  the other  with any  records or other
information  that may be relevant to any such Tax  Return,  audit,  examination,
proceeding  or  determination  and  (iii)  provide  the  other  with  any  final
determination of any such audit, examination,  proceedings or determination that
affects any amount required to be shown on any such Tax Return. Without limiting
the  generality  of the  foregoing,  TEC and TCA shall  each  retain,  until the
applicable  statutes of  limitations  (including any  extensions)  have expired,
copies of all Tax  Returns,  supporting  work  schedules  and other  records and
information  that may be  relevant to such Tax  Returns as may be  necessary  to
allow it to  satisfy  its  obligations  under  this  Section  5.20 and shall not
destroy or otherwise  dispose of any such records  without  first  providing the
other with a reasonable  opportunity  to review and copy them. To the extent TEC
reasonably   requests,   TCA  and   Thoratec   shall  agree  to   maintain   the
confidentiality  of any  information  furnished by TEC under this Section  5.20,
provided that TCA and Thoratec may use such  information in connection  with any
Tax Return of Thoratec,  TCA or any Subsidiary of TCA, any  communication  to or
from any taxing authority,  and in connection with any controversy regarding any
Taxes  payable  or paid  by  Thoratec,  TCA or any  Subsidiary  of TCA.  Without
limiting the  generality  of any of the  foregoing,  during the period ending 60
days after the Effective Time TEC shall use its commercially  reasonable efforts
to secure  for TCA and TCA's  Subsidiaries  any tax  benefit  to which  they are
entitled as a result of any  settlement or other  agreement  between TEC and any
tax  authority.

5.21 Environmental Insurance. Thoratec may choose to assess, before the Closing,
whether to purchase so-called  "environmental  insurance" with respect to one or
more of the  properties  that are  occupied  by TCA or  Subsidiaries  of TCA. If
Thoratec does choose to make that  assessment,  TEC and TCA shall cooperate with
Thoratec to assist that assessment including,  for example, by permitting one or
more  representatives  of Thoratec  or  prospective  insurers  to inspect  those
properties  and  records  relating  to  those  properties,  provided  that  that
inspection shall not extend beyond those non-invasive  procedures and steps that
comprise a so-called "ASTM Phase I Environmental  Site  Assessment" and provided
further that, before the Closing,  any information  generated by such inspection
shall not be disclosed to any Governmental  Entity or third party,  other than a
prospective  insurer,  except and only to the extent required by law. Nothing in


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<PAGE>

this Section 5.21 shall be construed to diminish any of the  representations and
warranties set forth in Article III including,  for example,  those set forth in
Section 3.20.

5.22 ITC Patent.  ITC holds U.S.  Patent No.  5731212  (the  "Patent").  TEC has
requested  that ITC grant a license  under the Patent to TEC or an  affiliate of
TEC that is not TCA or a Subsidiary of TCA. However, Thoratec has not as yet had
an opportunity  to assess whether that is an appropriate or desirable  course of
action for ITC.  Accordingly,  promptly after this Agreement is signed, TEC will
give Thoratec access to ITC personnel and information relevant to the Patent and
its applications in order to enable Thoratec to make that  assessment.  Thoratec
will make that  assessment in good faith and a commercially  reasonable  manner.
Thoratec will then advise TEC whether Thoratec is prepared to license the Patent
to TEC or such an affiliate and, if so, in what field or fields of use, in which
case  Thoratec  and  TEC  shall  then,  in  good  faith,  exercise  commercially
reasonable efforts to negotiate such a license.


                                   ARTICLE VI

                 CONDITIONS TO THE OBLIGATIONS OF EACH PARTY



     The  respective  obligations  of each party to this Agreement to effect the
Merger shall be subject to the  fulfillment  on or before the Effective  Time of
each of the  following  conditions,  any one or more of which  may be  waived in
writing by all the parties hereto:

6.1  Registration  Statement.  The  Registration  Statement  shall  have  become
effective in accordance with the provisions of the Securities Act. No stop order
suspending  the  effectiveness  of the  Registration  Statement  shall have been
issued by the SEC and remain in effect and no proceedings for such purpose shall
be pending before or threatened by the SEC.

6.2 TCA  Stockholder  Approval.  The  approval of a majority of the  outstanding
shares of TCA Common Stock for adoption of the Merger  Agreement and approval of
the  Merger  shall  have  been  obtained  at  the  TCA  Special  Meeting  or any
adjournment or postponement  thereof.

6.3 Thoratec Shareholder Approval. The approval of a majority of the outstanding
shares of Thoratec  Common  Stock in favor of the  issuance  of Thoratec  Common


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<PAGE>

Stock in the Merger shall have been obtained at the Thoratec  Special Meeting or
any adjournment or postponement thereof.

6.4 Listing of Additional  Shares.  The shares of Thoratec Common Stock issuable
in connection with the Merger shall have been approved for listing on Nasdaq.

6.5 Governmental  Clearances.  The waiting periods applicable to consummation of
the Merger under the HSR Act shall have expired or been  terminated.  Other than
the filing of the Articles of Merger which shall be  accomplished as provided in
Section  1.2,  all  authorizations,   consents,   orders  or  approvals  of,  or
declarations  or filings with, or expirations of waiting periods imposed by, any
Government  Entity  the  failure  of which to  obtain or  comply  with  would be
reasonably  likely to have a TCA Material Adverse Effect or a Thoratec  Material
Adverse  Effect  shall have been  obtained or filed.

6.6 Tax Matters.  Each of Thoratec and Merger Sub shall have received an opinion
of Heller Ehrman White & McAuliffe LLP,  counsel to Thoratec and Merger Sub, and
TCA shall have  received an opinion of Hale and Dorr LLP,  counsel to TCA,  each
such opinion dated as of the Effective Time, substantially to the effect that on
the  basis of the  facts,  representations  and  assumptions  set  forth in such
opinions,  (i) the Merger will qualify as a reorganization within the meaning of
Section 368(a) of the Code; (ii) each of Thoratec,  Merger Sub and TCA will be a
party to such  reorganization  within the meaning of Section 368(b) of the Code;
and (iii)  except  with  respect to cash  received in lieu of  fractional  share
interests in Thoratec Common Stock or upon the exercise of dissenters' appraisal
rights, no gain or loss will be recognized, for United States federal income tax
purposes,  by a stockholder of TCA as a result of the Merger with respect to the
shares of TCA Common Stock  converted into Thoratec  Common Stock. If counsel to
either  Thoratec  or TCA does not render  such  opinion,  this  condition  shall
nonetheless  be deemed to be satisfied  with respect to such party if counsel to
the other party  renders such opinion in the  required  form to such party.

6.7 Statute or Decree. No writ, order, temporary restraining order,  preliminary
injunction  or  injunction  shall have been  enacted,  entered,  promulgated  or
enforced by any court or other tribunal or governmental body or authority, which
remains in effect,  and  prohibits the  consummation  of the Merger or otherwise
makes it illegal,  nor shall any Government  Entity have  instituted any action,
suit or proceeding which remains pending and which seeks to enjoin,  restrain or
prohibit the  consummation  of the Merger in  accordance  with the terms of this
Agreement.

6.8 TCA Dissenting Shares.  Holders of shares of TCA Common Stock shall not have
satisfied  the  requirements  of  clauses  (i) and (ii) of Section  2.3(f)  with


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<PAGE>

respect  to 5% or more of the  shares of TCA  Common  Stock  outstanding  at the
record date for the TCA Special Meeting.

6.9 Thoratec Dissenting Shares. Holders of shares of Thoratec Common Stock shall
not have  satisfied  the  requirements  of  Sections  1300(b)(2)  and (3) of the
California Law with respect to 5% or more of the shares of Thoratec Common Stock
outstanding at the record date for the Thoratec Special Meeting.


                                   ARTICLE VII

            CONDITIONS TO THE OBLIGATIONS OF TCA AND THORATEC



7.1 Additional  Conditions To The  Obligations Of TCA. The obligations of TCA to
effect the Merger shall be subject to the  fulfillment  of each of the following
additional conditions, any one or more of which may be waived in writing by TCA:

     (a) The representations and warranties of Thoratec and Merger Sub contained
in this Agreement shall be true and correct,  in all material respects as of the
Effective Time, with the same force and effect as if made at the Effective Time,
provided  that the word  "material"  in this  sentence  shall  be  ignored  when
considered with reference to a representation  or warranty that already includes
a quantitative  qualification (for example,  a dollar threshold,  a reference to
"material"  or  "materiality",  or a reference to a "Thoratec  Material  Adverse
Effect".

     (b)  Thoratec  and Merger  Sub shall have  performed  and  complied  in all
material respects with all agreements and obligations required by this Agreement
to be performed or complied  with by them on or prior to the Closing  Date.

     (c)  Thoratec  and  Merger  Sub  shall  have  furnished  a  certificate  or
certificates  of  Thoratec  and Merger Sub  executed on behalf of one or more of
their respective  officers to evidence  compliance with the conditions set forth
in Sections 7.1(a) and (b) of this Agreement.

     (d) There shall not have  occurred,  since the date  hereof,  any  Thoratec
Material  Adverse  Effect.



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<PAGE>

     (e) At the option of TEC: (i) Thoratec, TCA and TEC shall have entered into
a collateral  and security  agreement  pursuant to which TCA will grant to TEC a
first priority  security interest in and to $45,000,000 to secure payment on the
TCA  Debentures  on the other terms and  conditions  set forth in Exhibit E-1 to
this Agreement,  (ii) Thoratec, TCA, TEC and a trustee shall have entered into a
collateral and security  agreement pursuant to which TCA will grant to a trustee
a first  priority  security  interest in and to $45,000,000 to secure payment on
the TCA  Debentures  and on the other terms and  conditions set forth in Exhibit
E-2 to this  Agreement or (iii)  Thoratec shall have secured a standby letter of
credit  in favor of TEC or a trustee  in the  amount  of  $45,000,000  to secure
payment on the TCA  Debentures  on the other terms and  conditions  set forth in
Exhibit E-3 to this Agreement, provided that TEC notify Thoratec of its election
in writing at least 30 days before the date  scheduled for the Special  Thoratec
Meeting and provided  further that, in each case, TEC shall be  responsible  for
all third party fees and costs associated with any agreement or letter of credit
entered into pursuant to this Section 7.1(e).  Notwithstanding the foregoing, if
TEC elects the  agreement  in clause (i) above,  TEC may,  at any time after the
Effective Time,  substitute the agreement in clause (ii) or the letter of credit
in clause (iii) at its sole cost and expense and Thoratec shall (and shall cause
TCA to) execute any documents or agreements  reasonably  necessary to effectuate
that election.

7.2  Additional  Conditions To The  Obligations  Of Thoratec And Merger Sub. The
obligations  of Thoratec and Merger Sub to effect the Merger shall be subject to
the fulfillment of each of the following additional conditions,  any one or more
of which may be waived in writing by Thoratec:

     (a) The  representations  and warranties of TCA contained in this Agreement
shall be true and correct,  in all material  respects as of the Effective  Time,
provided  that the word  "material"  in this  sentence  shall  be  ignored  when
considered with reference to a representation  or warranty that already includes
a quantitative  qualification (for example,  a dollar threshold,  a reference to
"material" or "materiality", or a reference to a "TCA Material Adverse Effect".

     (b) TCA shall have performed and complied in all material respects with all
agreements  and  obligations  required  by this  Agreement  to be  performed  or
complied  with  by it on or  prior  to the  Closing  Date.

     (c) TCA shall have  furnished a certificate  of TCA executed by one or more
of its officers to evidence compliance with the conditions set forth in Sections
7.2(a) and (b) of this Agreement.

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<PAGE>

     (d) Any consents,  approvals,  notifications,  disclosures, and filings and
registrations  listed  or  required  to be  listed  in  Schedule  3.3 of the TCA
Disclosure  Statement shall have been obtained or made.

     (e) There shall not have occurred,  since the date hereof, any TCA Material
Adverse  Effect.

     (f) TEC shall have  entered  into the  Termination  of  Corporate  Services
Agreement in substantially the form of Exhibit F to this Agreement.

     (g)  TEC  and  all  the  Subsidiaries  of  TEC  (other  than  TCA  and  the
Subsidiaries  of TCA) shall have paid in full all  advances  and other  payables
that are due and owing to TCA or any  Subsidiary of TCA and  regardless of their
due date,  net of all advances and other  payables that are due and owing to TEC
and  Subsidiaries  of TEC (other  than TCA and  Subsidiaries  of TCA) by TCA and
Subsidiaries  of TCA  regardless  of their due date.  At the Closing,  the Chief
Financial  Officer  of TCA and TEC shall  furnish  Thoratec  with a  certificate
itemizing all such advances and payables in whatever  reasonable detail Thoratec
may request.

     (h) After giving effect to the net payment  referenced  in Section  7.2(g),
but before giving effect to the  arrangements  adopted under Section  7.1(e) and
before payment of the fees owed to J.P.  Morgan  Securities  Inc. and The Beacon
Group Capital Services,  LLC, TCA's consolidated "cash and cash equivalents" and
"short-term  investments  available for sale" as of the Closing Date, determined
in the same way that those items were  determined in preparing the TCA Financial
Statements,  shall  total  at least  $125,700,000.

     (i) TEC and TCA shall have entered  into an  Amendment  No. 2 to the August
19,  1988  Sublease  Agreement   respecting  the  property  located  in  Woburn,
Massachusetts  in the form of Exhibit G to this  Agreement.  TEC shall also have
provided  Thoratec with written evidence,  reasonably  satisfactory to Thoratec,
that  the  term of such  Sublease  Agreement  and the  term of the  lease  dated
November  1983  between  WGO  Limited  Partnership  and  TEC,  as  successor  to
Thermedics Inc., has been extended to February 28, 2004.

     (j) TCA shall have timely  exercised its right to extend,  through June 30,
2001, its sublease with Sycamore Networks,  Inc. respecting the premises located
in Chelmsford, Massachusetts that are currently leased there by TCA.


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<PAGE>

                                  ARTICLE VIII

                                   TERMINATION



8.1  Termination.  This  Agreement  may be  terminated  at any time prior to the
Effective  Time,   whether  before  or  after  the  requisite  approval  of  the
stockholders of TCA or Thoratec:

     (a) by mutual written consent duly authorized by the boards of directors of
Thoratec and TCA;

     (b) by either TCA or Thoratec if the Merger shall not have been consummated
by March 1, 2001 (the "End  Date") for any  reason,  provided  that the right to
terminate this Agreement under this Section 8.1(b) shall not be available to any
party whose  action or failure to act has been a principal  cause of or resulted
in the  failure of the Merger to occur on or before such date and such action or
failure to act constitutes a material  breach of this  Agreement;

     (c) by either TCA or Thoratec if a court of competent jurisdiction or other
Government  Entity  shall  have  issued an order,  decree or ruling or taken any
other  action,  in any  case  having  the  effect  of  permanently  restraining,
enjoining or otherwise  prohibiting the Merger, which order,  decree,  ruling or
other action is final and nonappealable;

     (d) by TCA or Thoratec if the required  approval of the stockholders of TCA
contemplated  by this  Agreement  shall not have been  obtained by reason of the
failure  to obtain  the  required  vote at a meeting  of TCA  stockholders  duly
convened  therefore or at any adjournment  thereof if the final vote is taken in
fact or the meeting is  completed  without such a vote having been taken and the
meeting is not postponed or adjourned, provided that the right to terminate this
Agreement  under this  Section  8.1(d)  shall not be  available to TCA where the
failure to obtain TCA  stockholder  approval  shall have been  caused by (i) the
action or failure to act of TCA and such action or failure to act  constitutes a
breach by TCA of this Agreement or (ii) a breach of any of the TEC Agreements by
TEC;

     (e) by TCA or Thoratec if the  required  approval  of the  shareholders  of
Thoratec  contemplated  by this Agreement shall not have been obtained by reason
of the failure to obtain the required vote at a meeting of Thoratec shareholders


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<PAGE>

duly convened therefore or at any adjournment thereof if the final vote is taken
in fact or the meeting is  completed  without  such a vote having been taken and
the meeting is not postponed or adjourned,  provided that the right to terminate
this  Agreement  under this  Section  8.1(e)  shall not be available to Thoratec
where the failure to obtain Thoratec shareholder approval shall have been caused
by the action or failure to act of  Thoratec  and such  action or failure to act
constitutes a breach by Thoratec of this Agreement;

     (f) by Thoratec  (at any time prior to the  adoption  and  approval of this
Agreement and the Merger by the required vote of the  stockholders  of TCA) if a
TCA Triggering Event (as defined below) shall have occurred;

     (g) by TCA (at any time prior to the  approval of the  issuance of Thoratec
Common Stock in the Merger by the required vote of the stockholders of Thoratec)
if a Thoratec  Triggering  Event (as defined below) shall have occurred;

     (h) by TCA,  upon a breach of any  representation,  warranty,  covenant  or
agreement  on the  part of  Thoratec  set  forth  in this  Agreement,  or if any
representation  or warranty of TCA shall have become untrue, in either case such
that the  conditions  set forth in Section 7.1(a) or Section 7.1(b) would not be
satisfied as of the time of such breach or as of the time such representation or
warranty shall have become untrue,  provided that such  inaccuracy in Thoratec's
representations and warranties or breach by Thoratec remains uncured on the date
which is ten business days following written notice of such breach or inaccuracy
from TCA to  Thoratec  (it  being  understood  that TCA may not  terminate  this
Agreement  pursuant to this paragraph (h) if it shall have  materially  breached
this  Agreement  and remains in breach of this  agreement as of the date of such
termination);

     (i) by Thoratec, upon a breach of any representation, warranty, covenant or
agreement  on  the  part  of  TCA  set  forth  in  this  Agreement,  or  if  any
representation  or warranty of TCA shall have become untrue, in either case such
that the  conditions  set forth in Section 7.2(a) or Section 7.2(b) would not be
satisfied as of the time of such breach or as of the time such representation or
warranty  shall have  become  untrue,  provided  that such  inaccuracy  in TCA's
representations  and  warranties  or breach by TCA  remains  uncured on the date
which is ten business days following written notice of such breach or inaccuracy
from Thoratec to TCA (it being  understood  that Thoratec may not terminate this
Agreement  pursuant to this paragraph (i) if it shall have  materially  breached
this  Agreement  and remains in breach of this  agreement as of the date of such
termination);



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<PAGE>

     (j) by TCA if the average  closing  price per share of the Thoratec  Common
Stock, as reported on Nasdaq for the 20 trading-day period ending with the fifth
full trading day immediately preceding the common date that the Thoratec Special
Meeting and the TCA Special  Meeting are  initially  scheduled to occur,  as set
forth  in  the  Joint  Proxy  Statement/Prospectus   originally  mailed  to  the
shareholders of TCA and Thoratec,  is less than $14.00,  provided that, in order
to avail itself of this right,  TCA must give written  notice of  termination to
Thoratec  within  48 hours  after  that  20-trading  day  period  ends or

     (k) by  Thoratec  if the average  closing  price per share of the  Thoratec
Common Stock,  as reported on Nasdaq for the 20  trading-day  period ending with
the fifth full  trading  day  immediately  preceding  the  common  date that the
Thoratec Special Meeting and the TCA Special Meeting are initially  scheduled to
occur, as set forth in the Joint Proxy Statement/Prospectus originally mailed to
the  shareholders  of TCA and Thoratec,  is less than $11.00,  provided that, in
order to avail  itself  of this  right,  Thoratec  must give  written  notice of
termination  to TCA and TEC  within 48 hours  after that  20-trading  day period
ends.

     (l) For the purposes of this Agreement,  a "TCA Triggering  Event" shall be
deemed to have  occurred if: (i) the board of directors of TCA or any  committee
thereof shall for any reason have withdrawn or shall have amended or modified in
a manner  adverse to Thoratec its  recommendation  in favor of, the adoption and
approval of the  Agreement  or the  approval of the Merger;  (ii) TCA shall have
failed to include in the Joint Proxy  Statement/Prospectus the recommendation of
the board of  directors  of TCA in favor of the  adoption  and  approval  of the
Agreement  and the  approval of the Merger;  (iii) the board of directors of TCA
fails to reaffirm  its  recommendation  in favor of the adoption and approval of
the  Agreement  and the  approval of the Merger  within ten days after  Thoratec
requests in writing that such  recommendation  be reaffirmed;  (iv) the board of
directors of TCA or any committee thereof shall have approved or recommended any
TCA  Acquisition  Proposal  or  (v) a  tender  or  exchange  offer  relating  to
securities  of TCA  shall  have been  commenced  by a Person  unaffiliated  with
Thoratec,  and TCA shall not have sent to its security  holders pursuant to Rule
14e-2  promulgated under the Securities Act, within ten business days after such
tender  or  exchange  offer is  first  published,  sent or  given,  a  statement
disclosing that TCA recommends  rejection of such tender or exchange offer.

     (m) For the purposes of this Agreement, a "Thoratec Triggering Event" shall
be deemed to have  occurred  if: (i) the board of  directors  of Thoratec or any
committee  thereof shall for any reason have  withdrawn or shall have amended or


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modified in a manner adverse to TCA its  recommendation in favor of the issuance
of Thoratec  Common  Stock in the  Merger;  (ii)  Thoratec  shall have failed to
include in the Joint Proxy  Statement/Prospectus the recommendation of the board
of directors  of Thoratec in favor of the  issuance of Thoratec  Common Stock in
the  Merger;  (iii) the board of  directors  of Thoratec  fails to reaffirm  its
recommendation  in favor of the adoption and approval of the  Agreement  and the
approval of the Merger  within ten days after TCA  requests in writing that such
recommendation  be  reaffirmed;  (iv) the board of  directors of Thoratec or any
committee  thereof shall have approved or recommended  any Thoratec  Acquisition
Proposal or (v) a tender or exchange  offer  relating to  securities of Thoratec
shall have been commenced by a Person  unaffiliated with TCA, and Thoratec shall
not have sent to its security holders pursuant to Rule 14e-2  promulgated  under
the Securities Act, within ten business days after such tender or exchange offer
is  first  published,  sent or  given,  a  statement  disclosing  that  Thoratec
recommends   rejection  of  such  tender  or  exchange  offer.

8.2  Notice of  Termination;  Effect of  Termination.  Any  termination  of this
Agreement under Section 8.1 will be effective immediately upon the delivery of a
valid written notice of the terminating  party to the other parties  hereto.  In
the event of the  termination of this Agreement as provided in Section 8.1, this
Agreement  shall be of no further  force or  effect,  except (i) as set forth in
Section 5.3,  this Section 8.2,  Section 8.3 and Article IX, each of which shall
survive the termination of this Agreement, and (ii) nothing herein shall relieve
any party from  liability for any breach of this  Agreement.  No  termination of
this  Agreement  shall affect the  obligations  of the parties  contained in the
Confidentiality  Agreements,  all of which obligations shall survive termination
of this Agreement in accordance with their terms.

8.3   Fees and Expenses.

     (a) General. Except as set forth in this Section 8.3, all fees and expenses
incurred in connection with the TCA Agreements and the transactions contemplated
hereby  (including  the fees for filings under the HSR Act) shall be paid by the
party incurring such expenses whether or not the Merger is consummated, provided
that: (i) Thoratec and TCA shall share equally all fees and expenses, other than
attorneys'  and  accountants  fees and  expenses,  incurred  in  relation to the
printing  and  filing  (with  the SEC) of the Joint  Proxy  Statement/Prospectus
(including any preliminary  materials  related  thereto),  and the  Registration
Statement  (including  financial  statements and exhibits) and any amendments or
supplements  thereto and (ii) TEC shall pay all of Thoratec's and TCA's fees and
expenses  incurred  in  putting  in  place  and  implementing  the  arrangements
contemplated by Section 7.1(e).

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<PAGE>

     (b) TCA  Payments.  If this  Agreement is terminated by Thoratec or TCA, as
applicable, pursuant to Sections 8.1(d) or (f) or TCA breaches Section 5.4(e) or
TEC breaches  Section  5.4(k),  then TCA and TEC (jointly and  severally)  shall
promptly,  but  in no  event  later  than  two  days  after  the  date  of  such
termination,  pay Thoratec a fee equal to $12 million in  immediately  available
funds (the "TCA  Termination  Fee"). TCA and TEC acknowledge that the agreements
contained  in this  Section  8.3(b)  are an  integral  part of the  transactions
contemplated  by this  Agreement and that,  without these  agreements,  Thoratec
would not have entered into this Agreement.  Accordingly, if TCA and TEC fail to
pay in a timely  manner the amounts due pursuant to this Section  8.3(b) and, in
order to obtain such payment,  Thoratec makes a claim that results in a judgment
against TCA or TEC for the amounts set forth in this Section 8.3(b), TCA and TEC
shall pay to Thoratec its reasonable  costs and expenses  (including  reasonable
attorneys'  fees and  expenses)  in  connection  with such suit,  together  with
interest on the amounts  set forth in this  Section  8.3(b) at the prime rate of
The Chase  Manhattan  Bank in effect on the date such payment was required to be
made.

     (c) Thoratec Payments.  If this Agreement is terminated by TCA or Thoratec,
as applicable,  pursuant to Sections 8.1(e) or (g) or Thoratec  breaches Section
5.4(f), then Thoratec shall promptly,  but in no event later than two days after
the date of such termination, pay TCA a fee equal to $12 million (in the case of
a  termination  under Section  8.1(g) or a breach under  Section  5.4(f)) and $3
million  (in the case of a  termination  under  Section  8.1(e)) in  immediately
available funds (in either such case, the "Thoratec  Termination Fee"). Thoratec
acknowledges  that  the  agreements  contained  in this  Section  8.3(c)  are an
integral  part of the  transactions  contemplated  by this  Agreement  and that,
without these agreements,  TCA and TEC would not have entered into is Agreement.
Accordingly,  if  Thoratec  fails  to pay in a timely  manner  the  amounts  due
pursuant to this Section 8.3(c) and, in order to obtain such payment, TCA or TEC
makes a claim that  results in a judgment  against  Thoratec for the amounts set
forth in this Section 8.3(c), Thoratec shall pay to TCA and TEC their respective
reasonable  costs  and  expenses  (including   reasonable  attorneys'  fees  and
expenses) in  connection  with such suit,  together with interest on the amounts
set forth in this Section  8.3(c) at the prime rate of The Chase  Manhattan Bank
in effect on the date such payment was required to be made.


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<PAGE>

                                   ARTICLE IX

                                  MISCELLANEOUS



9.1 Amendment and Modification. Subject to applicable law, this Agreement may be
amended,  modified or supplemented only by written agreement of Thoratec, Merger
Sub, TCA and TEC at any time prior to the  Effective  Time,  provided that after
approval of this  Agreement  by the  stockholders  of TCA or  Thoratec,  no such
amendment or modification  shall change the amount or form of the  consideration
to be received by TCA's stockholders in the Merger.

9.2 Waiver of  Compliance;  Consents.  Any failure of Thoratec or Merger Sub, on
the one hand, or TCA or TEC, on the other hand,  to comply with any  obligation,
covenant,  agreement  or  condition  herein  may be  waived  by TCA or TEC (with
respect to any  failure by  Thoratec  or Merger  Sub) or  Thoratec or Merger Sub
(with  respect to any  failure by TCA or TEC),  respectively,  only by a written
instrument signed by the party granting such waiver,  but such waiver or failure
to insist upon strict  compliance with such obligation,  covenant,  agreement or
condition  shall not  operate as a waiver of, or estoppel  with  respect to, any
subsequent or other failure. Whenever this Agreement requires or permits consent
by or on behalf of any party hereto, such consent shall be given in writing in a
manner  consistent with the requirements for a waiver of compliance as set forth
in this Section 9.2.

9.3 Investigations.  The respective  representations and warranties of Thoratec,
Merger  Sub,  TCA and TEC  contained  herein  or in any  certificates  or  other
documents  delivered  prior to or at the Closing  shall not be deemed  waived or
otherwise  affected by any investigation  made by any party hereto.

9.4 Notices. All notices and other communications  hereunder shall be in writing
and shall be delivered  personally by overnight courier or similar means or sent
by  facsimile  with  written  confirmation  of  receipt,  to the  parties at the
addresses  specified  below (or at such  other  address  for a party as shall be
specified by like notice.  Any such notice shall be effective  upon receipt,  if
personally  delivered or on the next business day following  transmittal if sent
by confirmed facsimile. Notices shall be delivered as follows:



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<PAGE>

               (a)  if to TCA or TEC,
                    to:                 Thermo  Electron  Corporation
                                        81 Wyman Street
                                        Waltham,  Massachusetts  02454
                                        Telephone:   (781)  622-1198
                                        Facsimile:   (781)  622-1283
                                        Attention:  Seth  H. Hoogasian, Esq.

                    with a copy to:     Hale and Dorr LLP
                                        60 State Street
                                        Boston, Massachusetts 02109
                                        Telephone:  (617) 526-6000
                                        Facsimile   (617) 526-5000
                                        Attention:  Jay E. Bothwick, Esq.

               (b)  if to Thoratec      Thoratec Laboratories Corporation
                    or Merger Sub,      6035 Stoneridge Drive
                    to:                 Pleasanton, California 94588
                                        Telephone:  (925) 847-8600
                                        Facsimile:  (925) 847-8625
                                        Attention:  D. Keith Grossman

                    with a copy to:     Heller Ehrman White & McAuliffe LLP
                                        2500 Sand Hill Road, Suite 100
                                        Menlo Park, California  94025
                                        Telephone:  (650) 234-4200
                                        Facsimile:  (650) 234-4299
                                        Attention:  August J. Moretti, Esq.


9.5 Assignment; Third Party Beneficiaries. Neither this Agreement nor any right,
interest or obligation  hereunder shall be assigned by any of the parties hereto
without the prior written consent of the other parties.  This Agreement shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted  assigns.  This Agreement is not intended to confer any
rights or remedies upon any Person other than: (i) the parties to this Agreement
and (ii) with respect only to Section 5.8, the Indemnified Parties.

9.6  Termination  of Cross License  Agreement.  Effective if and when the Merger
closes and without the necessity for any additional  documentation  or action by


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<PAGE>

any party:  (a) the  Intellectual  Property Cross License  Agreement dated as of
August 19, 1988, between TCA and, by succession,  TEC is terminated; (b) TCA and
its  Subsidiaries  release  TEC and its  Subsidiaries  (other  than  TCA and its
Subsidiaries)  from all obligations and liabilities under that agreement and (c)
TEC and its Subsidiaries  (other than TCA and its Subsidiaries)  release TCA and
its Subsidiaries from all obligations and liabilities under that agreement.

9.7 Governing Law. This Agreement  shall be governed by the laws of the State of
California   without   reference  to  principles  of  conflicts  of  laws.

9.8  Counterparts.  This Agreement may be executed in two or more  counterparts,
each of which  shall be  deemed an  original,  but all of which  together  shall
constitute one and the same instrument.

9.9  Severability.  In case any one or more of the provisions  contained in this
Agreement should be finally  determined to be invalid,  illegal or unenforceable
in any  respect  against a party  hereto,  it shall be  adjusted  if possible to
effect the intent of the  parties.  In any event,  the  validity,  legality  and
enforceability of the remaining provisions contained herein shall not in any way
be  affected  or  impaired   thereby,   and  such   invalidity,   illegality  or
unenforceability  shall only apply as to such party in the specific jurisdiction
where such final  determination shall have been made.

9.10  Interpretation.  The  Article  and  Section  headings  contained  in  this
Agreement  are solely  for the  purpose  of  reference  and shall not in any way
affect the meaning or  interpretation  of this Agreement.  The word  "including"
shall be deemed to mean "including without limitation."

9.11 Entire  Agreement.  This Agreement and the other documents signed and dated
as of the date of this Agreement, including the exhibits hereto and thereto, and
the documents and instruments  referred to herein and therein (including the TCA
Disclosure Statement and the Thoratec Disclosure  Statement),  embody the entire
agreement  and  understanding  of the  parties  hereto in respect of the subject
matter contained  herein and therein.  There are no  representations,  promises,
warranties,  covenants, or undertakings, other than those expressly set forth or
referred to herein and  therein.

9.12  Definition  of "law".  When  used in this  Agreement  "law"  refers to any
applicable law (whether civil,  criminal or administrative)  including,  without
limitation,  common law,  statute,  statutory  instrument,  treaty,  regulation,
directive, decision, code, order, decree, injunction,  resolution or judgment of


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any  government,  quasi-government,   supranational,  federal,  state  or  local
government,  statutory  or  regulatory  body,  court,  or agency.

9.13 Rules of Construction. Each party to this Agreement has been represented by
counsel during the preparation  and execution of this  Agreement,  and therefore
waives any rule of  construction  that would  construe  ambiguities  against the
party drafting the agreement.

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<PAGE>


      IN WITNESS  WHEREOF,  Thoratec,  Merger Sub,  TCA and TEC have caused this
Agreement to be signed by their  respective duly  authorized  officers as of the
date first above written.



                                   THORATEC LABORATORIES CORPORATION


                                   By:       /s/ D. Keith Grossman
                                             ----------------------------------
                                   Name:     D. Keith Grossman
                                   Title:    President and Chief Executive
                                             Officer


                                   LIGHTNING ACQUISITION CORP.


                                    By:       /s/ D. Keith Grossman
                                             ----------------------------------
                                   Name:     D. Keith Grossman
                                   Title:    President and Chief Executive
                                             Officer

                                   THERMO ELECTRON CORPORATION


                                   By:       /s/ Theo Melas-Kyriazi
                                             ----------------------------------
                                   Name:     Theo Melas-Kyriazi
                                   Title:    Vice President and Chief Financial
                                             Officer


                                   THERMO CARDIOSYSTEMS INC.


                                   By:       /s/ Theo Melas-Kyriazi
                                             ----------------------------------
                                   Name:     Theo Melas-Kyriazi
                                   Title:    Vice President and Chief Financial
                                             Officer



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