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U.S. SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549


FORM 10-Q

(Mark one)

[X]     Quarterly report pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934

For the quarterly period ended March 29, 2003

or

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

for the transition period from                to

COMMISSION FILE NUMBER: 1-8145

THORATEC CORPORATION

(Exact name of registrant as specified in its charter)


|                                                                          |  |                                                
|------------------------------------------------------------------------- |  | -----------------------------------------------
|California
(State or other jurisdiction of
incorporation or organization) |  | 94-2340464
(I.R.S. Employer Identification No.)

|                                                                                       |  |                 
|-------------------------------------------------------------------------------------- |  | ----------------
|6035 Stoneridge Drive, Pleasanton, California
(Address of principal executive offices) |  | 94588
(Zip Code)

Registrants telephone number, including area code: (925) 847-8600

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

As of
May 9, 2003 registrant had 55,386,202 shares of common stock
outstanding.



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TABLE OF CONTENTS



|                              |                                                                                               |                                                           |  |  |  |  |  | 
|----------------------------- | --------------------------------------------------------------------------------------------- | --------------------------------------------------------- |  |  |  |  |  | 
|PART I. FINANCIAL INFORMATION
|                              | ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS                                          
|                              |                                                                                               | CONDENSED CONSOLIDATED BALANCE SHEETS                    
|                              |                                                                                               | CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS          
|                              |                                                                                               | CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS          
|                              |                                                                                               | CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
|                              |                                                                                               | NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS     
|                              | ITEM 2. MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|                              | ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE OF MARKET RISK                               
|                              | ITEM 4. CONTROLS AND PROCEDURES                                                              
|PART II. OTHER INFORMATION   
|                              | ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K                                                     
|SIGNATURES                   
|CERTIFICATION                
|Exhibit 10.1                 
|Exhibit 10.2                 
|Exhibit 99.1                 



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THORATEC CORPORATION AND SUBSIDIARIES

TABLE OF CONTENTS


|                                         |    |         |                                                                                                                               |  |    | 
|---------------------------------------- | -- | ------- | ----------------------------------------------------------------------------------------------------------------------------- |  | -- | 
|Part I. Financial Information            | 3 
|                                         |    | Item 1. | Condensed Consolidated Financial Statements (unaudited)                                                                       |  | 3 
|                                         |    |         | Condensed Consolidated Balance Sheets as of March 29, 2003 and December 28, 2002                                              |  | 3 
|                                         |    |         | Condensed Consolidated Statements of Operations for the Three Months Ended March 29, 2003
and March 30, 2002                  |  | 4 
|                                         |    |         | Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 29, 2003 and
March 30, 2002                  |  | 5 
|                                         |    |         | Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three Months Ended
March 29, 2003 and March 30, 2002 |  | 6 
|                                         |    |         | Notes to Condensed Consolidated Financial Statements                                                                          |  | 7 
|                                         |    | Item 2. | Managements Discussion and Analysis of Financial Condition and Results of Operations                                         |  | 14
|                                         |    | Item 3. | Quantitative and Qualitative Disclosure of Market Risk                                                                        |  | 17
|                                         |    | Item 4. | Controls and Procedures                                                                                                       |  | 17
|Part II. Other Information               | 18
|                                         |    | Item 4. | Submission of Matters to a Vote of Security Shareholders                                                                      | 
|                                         |    | Item 6. | Exhibits and Reports on Form 8-K                                                                                              |  | 18
|Signatures                               |    |         | 19                                                                                                                           
|Certification of Chief Executive Officer | 20
|Certification of Chief Financial Officer | 21
|Exhibits                                 |   

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PART I. FINANCIAL INFORMATION




ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

THORATEC CORPORATION AND SUBSIDIARIES




CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)
(in thousands)

|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |         |         | 
|------------------------------------------ | --------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | --------------------------------------------------- | ------ | --------- | ------- | ------------ | ------ | ------- | ------- | 
|                                           |                                                                 |                                                                                             |                                                     |        | March 29, |         | December 28,
|                                           |                                                                 |                                                                                             |                                                     |        | 2003      |         | 2002        
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |             
|Assets                                     |                                                                 |                                                                                             |                                                     |        |           |         |              |       
|Current Assets:                            |                                                                 |                                                                                             |                                                     |        |           |         |              |       
|                                           | Cash and cash equivalents                                       |                                                                                             | $                                                   | 48,747 |           |         | $            | 42,044 |        
|                                           | Short-term available-for-sale investments                       |                                                                                             |                                                     |       |           |         |              | 3,439  |        
|                                           | Receivables, net of allowances of $192 in 2003 and $238 in 2002 |                                                                                             |                                                     | 24,548 |           |         |              | 27,593 |        
|                                           | Inventories                                                     |                                                                                             |                                                     | 39,122 |           |         |              | 38,835 |        
|                                           | Deferred tax asset                                              |                                                                                             |                                                     | 11,888 |           |         |              | 12,182 |        
|                                           | Prepaid expenses and other assets                               |                                                                                             |                                                     | 3,452  |           |         |              | 2,517  |        
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Current Assets                                |        |           | 127,757 |              |        |         | 126,610 | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|Property, plant and equipment, net         |                                                                 |                                                                                             | 24,682                                              |        |           |         | 24,715       |       
|Long-term available-for-sale investments   |                                                                 |                                                                                             | 31,981                                              |        |           |         | 30,051       |       
|Goodwill                                   |                                                                 |                                                                                             | 96,492                                              |        |           |         | 96,492       |       
|Purchased intangible assets, net           |                                                                 |                                                                                             | 181,259                                             |        |           |         | 184,282      |       
|Long-term deferred tax asset               |                                                                 |                                                                                             | 3,836                                               |        |           |         | 5,244        |       
|Other assets                               |                                                                 |                                                                                             | 1,078                                               |        |           |         | 1,038        |       
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Assets                                        |        | $         | 467,085 |              |        | $       | 468,432 | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|Liabilities and Shareholders Equity       |                                                                 |                                                                                             |                                                     |        |           |         |              |       
|Current Liabilities:                       |                                                                 |                                                                                             |                                                     |        |           |         |              |       
|                                           |                                                                 | Accounts payable                                                                            |                                                     | $      | 5,574     |         |              | $      | 6,319   |        
|                                           |                                                                 | Accrued compensation                                                                        |                                                     |        | 5,398     |         |              |        | 6,372   |        
|                                           |                                                                 | Accrued merger, restructuring and other                                                     |                                                     |        | 103       |         |              |        | 1,208   |        
|                                           |                                                                 | Estimated liabilities for warranty, legal and other                                         |                                                     |        | 1,171     |         |              |        | 1,304   |        
|                                           |                                                                 | Other accrued liabilities                                                                   |                                                     |        | 3,832     |         |              |        | 3,435   |        
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Current Liabilities                           |        |           | 16,078  |              |        |         | 18,638  | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|Long-term deferred tax liability and other |                                                                 |                                                                                             | 74,223                                              |        |           |         | 75,454       |       
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Liabilities                                   |        |           | 90,301  |              |        |         | 94,092  | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|Shareholders Equity:                      |                                                                 |                                                                                             |                                                     |        |           |         |              |       
|                                           |                                                                 | Common shares; 100,000 authorized; issued and outstanding
55,168 in 2003 and 55,037 in 2002 |                                                     |        | 410,999   |         |              |        | 410,266 |        
|                                           |                                                                 | Deferred compensation                                                                       |                                                     |        | (3,435    | )       |              |        | (3,735  | )      
|                                           |                                                                 | Accumulated deficit                                                                         |                                                     |        | (30,995   | )       |              |        | (32,412 | )      
|                                           |                                                                 | Accumulated other comprehensive income:                                                     |                                                     |        |           |         |              |        |         |        
|                                           |                                                                 |                                                                                             | Cumulative foreign currency translation adjustments |        |           | 63      |              |        |         | 91      | 
|                                           |                                                                 |                                                                                             | Unrealized gain on investment                       |        |           | 152     |              |        |         | 130     | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total accumulated other comprehensive income        |        |           | 215     |              |        |         | 221     | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Shareholders Equity                          |        |           | 376,784 |              |        |         | 374,340 | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        
|                                           |                                                                 |                                                                                             | Total Liabilities and Shareholders Equity          |        | $         | 467,085 |              |        | $       | 468,432 | 
|                                           |                                                                 |                                                                                             |                                                     |        |           |         |              |        |        

See notes to condensed consolidated financial statements.

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THORATEC CORPORATION AND SUBSIDIARIES




CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)
(in thousands, except per share data)

|                                                    |                                             |                          |        |                    |        |                |        |        |        | 
|--------------------------------------------------- | ------------------------------------------- | ------------------------ | ------ | ------------------ | ------ | -------------- | ------ | ------ | ------ | 
|                                                    |                                             |                          |        | Three Months Ended
|                                                    |                                             |                          |        |                   
|                                                    |                                             |                          |        | March 29, 2003     |        | March 30, 2002
|                                                    |                                             |                          |        |                    |        |               
|Product sales                                       |                                             | $                        | 36,062 |                    |        | $              | 29,639 |       
|Cost of product sales                               |                                             |                          | 14,891 |                    |        |                | 13,164 |       
|                                                    |                                             |                          |        |                    |        |                |        |       
|Gross profit                                        |                                             |                          | 21,171 |                    |        |                | 16,475 |       
|                                                    |                                             |                          |        |                    |        |                |        |       
|Operating expenses:                                 |                                             |                          |        |                    |        |                |        |       
|                                                    | Selling, general and administrative         |                          |        | 10,060             |        |                |        | 8,719  |       
|                                                    | Research and development                    |                          |        | 6,260              |        |                |        | 6,903  |       
|                                                    | Amortization of purchased intangible assets |                          |        | 3,096              |        |                |        | 3,096  |       
|                                                    | Merger, restructuring and other costs       |                          |        | (57                | )      |                |        | 321    |       
|                                                    |                                             |                          |        |                    |        |                |        |       
|                                                    |                                             | Total operating expenses |        |                    | 19,359 |                |        |        | 19,039 | 
|                                                    |                                             |                          |        |                    |        |                |        |       
|Income (loss) from operations                       |                                             |                          | 1,812  |                    |        |                | (2,564 | )     
|Interest
and other income (expense) - net           |                                             |                          | 512    |                    |        |                | (368   | )     
|                                                    |                                             |                          |        |                    |        |                |        |       
|Income (loss) before income tax expense (benefit)   |                                             |                          | 2,324  |                    |        |                | (2,932 | )     
|Income tax expense (benefit)                        |                                             |                          | 906    |                    |        |                | (1,174 | )     
|                                                    |                                             |                          |        |                    |        |                |        |       
|Net income (loss)                                   |                                             | $                        | 1,418  |                    |        | $              | (1,758 | )     
|                                                    |                                             |                          |        |                    |        |                |        |       
|Net income (loss) per share:                        |                                             |                          |        |                    |        |                |        |       
|                                                    | Basic and diluted                           |                          | $      | 0.03               |        |                | $      | (0.03  | )     
|                                                    |                                             |                          |        |                    |        |                |        |       
|Shares used to compute net income (loss) per share: |                                             |                          |        |                    |        |                |        |       
|                                                    | Basic                                       |                          |        | 55,057             |        |                |        | 56,650 |       
|                                                    | Diluted                                     |                          |        | 55,534             |        |                |        | 56,650 |       

See notes to condensed consolidated financial statements.

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THORATEC CORPORATION AND SUBSIDIARIES




CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)
(in thousands)

|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |   |        |         |  
|-------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- |  | -------------------------------------- | ------------------------------------------------------ | - | ------------------ | ----- | --------- | - | ------ | ------- | -
|                                                                                                   |                                                            |  |                                        |                                                        |   | Three Months Ended
|                                                                                                   |                                                            |  |                                        |                                                        |   |                   
|                                                                                                   |                                                            |  |                                        |                                                        |   | March 29,          |       | March 30,
|                                                                                                   |                                                            |  |                                        |                                                        |   | 2003               |       | 2002     
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |          
|Cash flows from operating activities:                                                              |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Net income (loss)                                          |  | $                                      | 1,418                                                  |   |                    | $     | (1,758    | )
|Adjustments to reconcile net income (loss) to net cash provided by
(used in) operating activities: |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Depreciation and amortization                              |  |                                        | 4,566                                                  |   |                    |       | 4,226     |  
|                                                                                                   | Amortization of deferred compensation                      |  |                                        | 300                                                    |   |                    |       | 279       |  
|                                                                                                   | Non-cash compensation                                      |  |                                        | 4                                                      |   |                    |       | 61        |  
|                                                                                                   | Change in net deferred tax liability                       |  |                                        | 599                                                    |   |                    |       | (766      | )
|                                                                                                   | Changes in assets and liabilities:                         |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   |                                                            |  | Receivables                            |                                                        |   | 3,003              |       |           |   | 3,139  |        
|                                                                                                   |                                                            |  | Inventories                            |                                                        |   | (344               | )     |           |   | (3,129 | )      
|                                                                                                   |                                                            |  | Prepaid expenses and other assets      |                                                        |   | (957               | )     |           |   | (276   | )      
|                                                                                                   |                                                            |  | Accounts payable and other liabilities |                                                        |   | (2,405             | )     |           |   | (4,652 | )      
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   |                                                            |  |                                        | Net cash provided by (used in) operating activities    |   |                    | 6,184 |           |   |        | (2,876  | )
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|Cash flows from investing activities:                                                              |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Purchases of available-for-sale investments                |  |                                        | (4,439                                                 | ) |                    |       |          |  
|                                                                                                   | Sales of available-for-sale investments                    |  |                                        | 5,709                                                  |   |                    |       |          |  
|                                                                                                   | Reclassification from restricted cash and cash equivalents |  |                                        |                                                       |   |                    |       | 45,883    |  
|                                                                                                   | Purchases of property, plant and equipment                 |  |                                        | (1,317                                                 | ) |                    |       | (1,280    | )
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   |                                                            |  |                                        | Net cash provided by (used in) in investing activities |   |                    | (47   | )         |   |        | 44,603  |  
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|Cash flows from financing activities:                                                              |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Proceeds from stock option exercises                       |  |                                        | 622                                                    |   |                    |       | 617       |  
|                                                                                                   | Proceeds from common stock offering                        |  |                                        |                                                       |   |                    |       | 15,452    |  
|                                                                                                   | Repayment of convertible debentures                        |  |                                        |                                                       |   |                    |       | (54,838   | )
|                                                                                                   | Repurchase of common stock                                 |  |                                        |                                                       |   |                    |       | (1,810    | )
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   |                                                            |  |                                        | Net cash provided by (used in) financing activities    |   |                    | 622   |           |   |        | (40,579 | )
|                                                                                                   | Effect of exchange rate changes on cash                    |  |                                        | (56                                                    | ) |                    |       | (6        | )
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   |                                                            |  |                                        | Net increase in cash and cash equivalents              |   |                    | 6,703 |           |   |        | 1,142   |  
|                                                                                                   | Cash and cash equivalents at beginning of period           |  |                                        | 42,044                                                 |   |                    |       | 91,725    |  
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|                                                                                                   | Cash and cash equivalents at end of period                 |  | $                                      | 48,747                                                 |   |                    | $     | 92,867    |  
|                                                                                                   |                                                            |  |                                        |                                                        |   |                    |       |           |  
|Supplemental Cash Flow Disclosure:                                                                 |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Cash paid for taxes                                        |  | $                                      | 260                                                    |   |                    | $     | 54        |  
|                                                                                                   | Cash paid for interest                                     |  | $                                      |                                                       |   |                    | $     | 839       |  
|Supplemental Disclosure of Noncash Investing and Financing Activities:                             |                                                            |  |                                        |                                                        |   |                    |       |          
|                                                                                                   | Reclassification of assembled workforce, net of taxes      |  | $                                      |                                                       |   |                    | $     | 1,334     |  
|                                                                                                   | Tax benefit related to stock option exercises              |  | $                                      | 107                                                    |   |                    | $     | 147       |  

See notes to condensed consolidated financial statements.

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THORATEC CORPORATION AND SUBSIDIARIES




CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(unaudited)
(in thousands)

|                                       |                                          |   |                    |     |           |   |        |    |  
|-------------------------------------- | ---------------------------------------- | - | ------------------ | --- | --------- | - | ------ | -- | -
|                                       |                                          |   | Three Months Ended
|                                       |                                          |   |                   
|                                       |                                          |   | March 29,          |     | March 30,
|                                       |                                          |   | 2003               |     | 2002     
|                                       |                                          |   |                    |     |          
|Net income(loss)                       |                                          | $ | 1,418              |     |           | $ | (1,758 | ) 
|                                       |                                          |   |                    |     |           |   |        |   
|Other net comprehensive income (loss): |                                          |   |                    |     |           |   |        |   
|                                       | Unrealized gain on
investments           |   |                    | 22  |           |   |        |   |  
|                                       | Foreign currency translation adjustments |   |                    | (28 | )         |   |        | (9 | )
|                                       |                                          |   |                    |     |           |   |        |   
|Comprehensive income (loss)            |                                          | $ | 1,412              |     |           | $ | (1,767 | ) 
|                                       |                                          |   |                    |     |           |   |        |   

See notes to condensed consolidated financial statements.

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THORATEC CORPORATION AND SUBSIDIARIES




NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)

1. Basis of Presentation

The interim condensed consolidated financial statements of Thoratec
Corporation, referred to as we, our, Thoratec, or the Company have been
prepared and presented in accordance with accounting principles generally
accepted in the United States of America and the rules and regulations of the
Securities and Exchange Commission, or the SEC, without audit and, in our
opinion, reflect all adjustments necessary (consisting only of normal recurring
adjustments) to present fairly our financial position at March 29, 2003, our
results of operations for the three-month periods ended March 29, 2003 and
March 30, 2002 and cash flows for the three-month periods ended March 29, 2003
and March 30, 2002. Certain information and footnote disclosures normally
included in our annual financial statements prepared in accordance with
accounting principles generally accepted in the United States of America have
been condensed or omitted. The accompanying financial statements should be read
in conjunction with our fiscal 2002 consolidated financial statements filed
with the SEC in our Annual Report on Form 10-K. The operating results for any
interim period are not necessarily indicative of the results that may be
expected for any future period.

The preparation of our condensed consolidated financial statements
included herein necessarily requires us to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the consolidated balance sheet dates and
the reported amounts of revenues and expenses for the periods presented.

We have made certain reclassifications of 2002 amounts to conform to the
current presentation.

2. Merger of Thoratec and TCA

Our merger with Thermo Cardiosystems Inc., or TCA, was completed on
February 14, 2001, which we refer to as the Merger. The Merger was accounted
for under the purchase method of accounting and was treated as a reverse
acquisition because the shareholders of TCA owned the majority of our common
stock after the Merger. TCA was considered the acquiror for accounting and
financial reporting purposes. Due to the reverse acquisition, Thoratecs assets
and liabilities were recorded based upon their estimated fair market values at
the date of acquisition.

As a result of the Merger, $76,858,000 relating to in-process research and
development, or IPR&D, was expensed in the first quarter of 2001. The one-time
write-off of IPR&D related to four technology projects that were in
development, had not reached technological feasibility, had no alternative
future use and for which successful development was uncertain. One of the
projects was completed in 2002. There have been no significant developments
subsequent to the Merger related to the current status of any of the three
remaining IPR&D projects that would result in material changes to the
assumptions or resulting valuation performed at the time of the Merger.
Development of IPR&D projects continues and while the timing of completion of
these projects may vary due to the highly regulated and technical nature of our
products, current estimates remain materially consistent with our initial
estimates

3. New Accounting Pronouncements

In June 2001, the Financial Accounting Standards Board, or FASB, issued
Statement of Financial Accounting Standards, or SFAS, No. 143, Accounting for
Asset Retirement Obligations. SFAS No. 143 addresses financial accounting and
reporting for obligations associated with the retirement of tangible long-lived
assets and the associated asset retirement costs, including legal obligations.
The adoption of SFAS No. 143 as of the beginning of fiscal year 2003 did not
have any impact on our financial position, results of operations or cash flows.

In April 2002, the FASB issued SFAS No. 145, (Rescission of FASB
Statements 4, 44, and 64, Amendment of FASB Statement No. 13, and Technical
Corrections) which, among other things, changed the presentation of gains and
losses on the extinguishment of debt. Any gain or loss on extinguishment of
debt that does not meet the criteria in Accounting Principle Board, or APB,
Opinion No. 30, Reporting the Results of Operations - Reporting the Effects of
Disposal of a Segment of a Business, and Extraordinary, Unusual and
Infrequently Occurring Events and Transactions, shall be included in operating
earnings and not presented separately as an extraordinary item. We adopted SFAS
No. 145 at the beginning of fiscal year 2003. Upon adoption, we reclassified
the extraordinary loss on extinguishment of debt incurred in the first quarter
of 2002 of $0.5 million to interest and other income (expense)-net.

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In June 2002, the FASB issued SFAS No. 146, Accounting for Costs
Associated with Exit or Disposal Activities, which addresses accounting for
restructuring and similar costs. SFAS No. 146 supersedes previous accounting
guidance, principally Emerging Issues Task Force Issue, or EITF, No. 94-3
Liability Recognition for Certain Employee Termination Benefits and Other
Costs to Exit on Activity (Including Certain Costs Incurred in a
Restructuring). The Company will adopt the provisions of SFAS No. 146 for any
restructuring activities initiated after December 31, 2002. SFAS No. 146 may
affect the timing of recognizing future restructuring costs as well as the
amounts recognized.

In November 2002, the FASB issued Interpretation, or FIN, No. 45,
Guarantors Accounting and Disclosure Requirements for Guarantees, Including
Indirect Guarantees of Indebtedness of Others. FIN No. 45 requires a liability
to be recognized at the time a company issues a guarantee for the fair value of
the obligations assumed under certain guarantee agreements. Additional
disclosures about guarantee agreements are also required in the interim and
annual financial statements, including a roll forward of the entitys product
warranty liabilities. The disclosure provisions of FIN No. 45 were effective
for us as of fiscal year end 2002. The provisions for initial recognition and
measurement of guarantee agreements are effective on a prospective basis for
guarantees that are issued or modified after December 28, 2002. We do not
expect that the recognition provisions of FIN No. 45 will have a material
impact upon our consolidated financial statements.

In December 2002, the FASB issued SFAS No. 148, Accounting for
Stock-Based Compensation-Transition and Disclosure. SFAS No. 148 amends SFAS
No. 123, Accounting for Stock-Based Compensation, to provide alternative
methods of transition for a voluntary change to the fair value based method of
accounting for stock-based employee compensation. In addition, SFAS No. 148
amends the disclosure requirements of SFAS No. 123 to require prominent
disclosures in both annual and interim financial statements of the method of
accounting for stock-based employee compensation and the effect of the method
used on reported results. SFAS No. 148 is effective for fiscal years beginning
after December 15, 2002. We adopted the disclosure provisions of SFAS No. 148
at the beginning of fiscal 2003. We do not expect to change to use the fair
value based method of accounting for stock-based financial position, results of
operations or cash flows.

We account for stock-based awards to employees using the intrinsic value
method in accordance with APB Opinion No. 25, Accounting for Stock Issued to
Employees. Accordingly, no accounting recognition is given to stock options
granted at fair market value until they are exercised. Upon exercise, net
proceeds, including tax benefits realized, are recorded in common stock. The
fair value of each option granted is estimated using the Black-Scholes option
pricing model. If compensation cost for our stock-based plans had been
determined based on the fair value at the grant dates for awards under those
plans, consistent with the method of FASB Statement No. 123, our reported net
income (loss) would have been adversely affected, as shown in the following
table (in thousands, except per share data):

|                                             |                                                                                                                                             |   |                    |        |           |   |        |        |  
|-------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | - | ------------------ | ------ | --------- | - | ------ | ------ | -
|                                             |                                                                                                                                             |   | Three Months Ended
|                                             |                                                                                                                                             |   |                   
|                                             |                                                                                                                                             |   | March 29,          |        | March 30,
|                                             |                                                                                                                                             |   | 2003               |        | 2002     
|                                             |                                                                                                                                             |   |                    |        |          
|Net income (loss):                           |                                                                                                                                             |   |                    |        |           |   |        |       
|As reported                                  |                                                                                                                                             | $ | 1,418              |        |           | $ | (1,758 | )     
|                                             | Add: Stock-based compensation expense
included in reported net income, net of
related tax effects                                           |   |                    | 383    |           |   |        | 407    |  
|                                             | Deduct: Total stock-based employee
compensation expense determined under
fair value based method for all awards,
net of related tax effects |   | $                  | (2,157 | )         |   | $      | (2,438 | )
|                                             |                                                                                                                                             |   |                    |        |           |   |        |       
|                                             | Pro forma                                                                                                                                   |   | $                  | (356   | )         |   | $      | (3,789 | )
|                                             |                                                                                                                                             |   |                    |        |           |   |        |       
|Basic and diluted earnings (loss) per share: |                                                                                                                                             |   |                    |        |           |   |        |       
|                                             | As reported                                                                                                                                 |   | $                  | 0.03   |           |   | $      | (0.03  | )
|                                             | Pro forma                                                                                                                                   |   | $                  | (0.01  | )         |   | $      | (0.07  | )

The fair value of each option granted is estimated at the date of grant
using the Black-Scholes option-pricing model with the following assumptions
used for grants made:

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|                        |  |                    |      |            |  |  |      |  
|----------------------- |  | ------------------ | ---- | ---------- |  |  | ---- | -
|                        |  | Three Months Ended
|                        |  |                   
|                        |  | March 29,          |      | March 30, 
|                        |  | 2003               |      | 2002      
|                        |  |                    |      |           
|Risk-free interest rate |  |                    | 3.83 | %          |  |  | 4.79 | %
|Expected volatility     |  |                    | 69   | %          |  |  | 69   | %
|Expected option life    |  | 3.85 years         |      | 3.85 years
|Dividends               |  | None               |      | None      

4. Inventories

Inventories consist of the following (in thousands):

|                |       |   |           |        |              |   |        |        | 
|--------------- | ----- | - | --------- | ------ | ------------ | - | ------ | ------ | 
|                |       |   | As of    
|                |       |   |          
|                |       |   | March 29, |        | December 28,
|                |       |   | 2003      |        | 2002        
|                |       |   |           |        |             
|Finished goods  |       | $ | 21,501    |        |              | $ | 22,119 |       
|Work in process |       |   | 8,141     |        |              |   | 6,645  |       
|Raw materials   |       |   | 9,480     |        |              |   | 10,071 |       
|                |       |   |           |        |              |   |        |       
|                | Total |   | $         | 39,122 |              |   | $      | 38,835 | 
|                |       |   |           |        |              |   |        |       

5. Property, Plant and Equipment

Property, plant, and equipment consist of the following (in thousands):

|                                       |  |           |         |              |  |   |         |  
|-------------------------------------- |  | --------- | ------- | ------------ |  | - | ------- | -
|                                       |  | As of    
|                                       |  |          
|                                       |  | March 29, |         | December 28,
|                                       |  | 2003      |         | 2002        
|                                       |  |           |         |             
|Property, plant and equipment, at cost |  | $         | 50,250  |              |  | $ | 49,355  |  
|Less accumulated depreciation          |  |           | (25,568 | )            |  |   | (24,640 | )
|                                       |  |           |         |              |  |   |         |  
|Total                                  |  | $         | 24,682  |              |  | $ | 24,715  |  
|                                       |  |           |         |              |  |   |         |  

6. Goodwill and Other Intangible Assets

The change in the carrying amount of goodwill, which is only attributable
to our Cardiovascular business segment, for the three-month periods ended March
29, 2003 and March 30, 2002 was as follows (in thousands):

|                                                           |  |                    |        |           |  |   |        |  
|---------------------------------------------------------- |  | ------------------ | ------ | --------- |  | - | ------ | -
|                                                           |  | Three Months Ended
|                                                           |  |                   
|                                                           |  | March 29,          |        | March 30,
|                                                           |  | 2003               |        | 2002     
|                                                           |  |                    |        |          
|Beginning balance                                          |  | $                  | 96,492 |           |  | $ | 95,209 |  
|Reclassification of assembled workforce, net of taxes      |  |                    |       |           |  |   | 1,334  |  
|Adjustment to reflect resolution of pre-merger
contingency |  |                    |       |           |  |   | (51    | )
|                                                           |  |                    |        |           |  |   |        |  
|Ending balance                                             |  | $                  | 96,492 |           |  | $ | 96,492 |  
|                                                           |  |                    |        |           |  |   |        |  

The components of identifiable intangible assets, consisting primarily of
patents and trademarks, core technology and developed technology, which are
included in purchased intangible assets on the consolidated balance sheets, are
as follows (in thousands):

|                       |                                   |   |                      |         |              |   |                     |         |   |   |         |         | 
|---------------------- | --------------------------------- | - | -------------------- | ------- | ------------ | - | ------------------- | ------- | - | - | ------- | ------- | 
|                       |                                   |   | As of March 29, 2003
|                       |                                   |   |                     
|                       |                                   |   | Gross Carrying       |         | Accumulated  |   |                     |         |  
|                       |                                   |   | Amount               |         | Amortization |   | Net Carrying Amount
|                       |                                   |   |                      |         |              |   |                    
|Patents and Trademarks |                                   | $ | 37,478               |         |              | $ | (7,694              | )       |   | $ | 29,784  |        
|Core Technology        |                                   |   | 37,181               |         |              |   | (3,950              | )       |   |   | 33,231  |        
|Developed Technology   |                                   |   | 132,301              |         |              |   | (14,057             | )       |   |   | 118,244 |        
|                       |                                   |   |                      |         |              |   |                     |         |   |   |         |        
|                       | Total Purchased Intangible Assets |   | $                    | 206,960 |              |   | $                   | (25,701 | ) |   | $       | 181,259 | 
|                       |                                   |   |                      |         |              |   |                     |         |   |   |         |        

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|                       |                                   |   |                         |         |              |   |                     |         |   |   |         |         | 
|---------------------- | --------------------------------- | - | ----------------------- | ------- | ------------ | - | ------------------- | ------- | - | - | ------- | ------- | 
|                       |                                   |   | As of December 28, 2002
|                       |                                   |   |                        
|                       |                                   |   | Gross Carrying          |         | Accumulated  |   |                     |         |  
|                       |                                   |   | Amount                  |         | Amortization |   | Net Carrying Amount
|                       |                                   |   |                         |         |              |   |                    
|Patents and Trademarks |                                   | $ | 37,478                  |         |              | $ | (6,789              | )       |   | $ | 30,689  |        
|Core Technology        |                                   |   | 37,181                  |         |              |   | (3,486              | )       |   |   | 33,695  |        
|Developed Technology   |                                   |   | 132,301                 |         |              |   | (12,403             | )       |   |   | 119,898 |        
|                       |                                   |   |                         |         |              |   |                     |         |   |   |         |        
|                       | Total Purchased Intangible Assets |   | $                       | 206,960 |              |   | $                   | (22,678 | ) |   | $       | 184,282 | 
|                       |                                   |   |                         |         |              |   |                     |         |   |   |         |        

For the three months ended March 29, 2003, purchased intangible assets
amortization expense also included $73,000 of amortization of deferred
compensation recorded at the time of the Merger related to the
valuation of stock options.

As of the beginning of fiscal 2002, the purchased intangible asset
associated with the assembled workforce in the amount of $1,334,000, net of
accumulated amortization of $381,000 and taxes of $897,000, was reclassified to
goodwill.

Amortization expense related to identifiable intangible assets for both of
the three month periods ended March 29, 2003 and March 30, 2002 was $3,096,000.
Amortization expense is expected to be approximately $12,300,000 for each of
the next five years. The purchased intangible assets have estimated useful
lives of eight to twenty years.

7. Product Warranty

The majority of our products are covered by a one-year limited
manufacturers warranty. Estimated contractual warranty obligations are
recorded when related sales are recognized and any additional amounts are
recorded when such costs are probable and can be reasonably estimated. The
change in accrued warranty expense for the three months ended March 29, 2003
and March 30, 2002 is summarized in the following table (in thousands):

|                                  |  |              |     |            |  |            |     |        |  |         |      |   |  |   |     | 
|--------------------------------- |  | ------------ | --- | ---------- |  | ---------- | --- | ------ |  | ------- | ---- | - |  | - | --- | 
|                                  |  | Balance      |     | Charges to |  |            |     |        |  | Balance
|                                  |  | Beginning of |     | Costs and  |  |            |     |        |  | End of 
|                                  |  | Period       |     | Expenses   |  | Deductions |     | Period
|                                  |  |              |     |            |  |            |     |       
|Three months ended March 29, 2003 |  | $            | 695 |            |  | $          | 36  |        |  | $       | (48  | ) |  | $ | 683 | 
|Three months ended March 30, 2002 |  | $            | 910 |            |  | $          | 124 |        |  | $       | (102 | ) |  | $ | 932 | 

8. Merger, Restructuring and Other Costs

Merger, restructuring and other costs were recorded in the condensed
consolidated statements of operations as follows (in thousands):

|              |  |                    |     |           |  |   |     | 
|------------- |  | ------------------ | --- | --------- |  | - | --- | 
|              |  | Three Months Ended
|              |  |                   
|              |  | March 29           |     | March 30,
|              |  | 2003               |     | 2002     
|              |  |                    |     |          
|Merger        |  | $                  |    |           |  | $ | 137 | 
|Restructuring |  |                    | (57 | )         |  |   | 184 | 
|Other         |  |                    |    |           |  |   |    | 
|              |  |                    |     |           |  |   |     | 
|Total         |  | $                  | (57 | )         |  | $ | 321 | 
|              |  |                    |     |           |  |   |     | 

10



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Merger Costs

The following table reflects the activity in accrued merger costs for the
three-month periods ended March 29, 2003 and March 30, 2002 (in thousands):

|                      |  |                                                 |   |                    |   |           |      |   |      |  
|--------------------- |  | ----------------------------------------------- | - | ------------------ | - | --------- | ---- | - | ---- | -
|                      |  |                                                 |   | Three Months Ended
|                      |  |                                                 |   |                   
|                      |  |                                                 |   | March 29,          |   | March 30,
|                      |  |                                                 |   | 2003               |   | 2002     
|                      |  |                                                 |   |                    |   |          
|Accrued Merger Costs: |  |                                                 |   |                    |   |           |      |  
|Beginning balance     |  | $                                               |  |                    |   | $         | 472  |  
|Add:                  |  |                                                 |  |                    |   |           |      |  
|                      |  | Accruals pursuant to executive waiver agreement |   |                    |  |           |      |   | 137  |  
|Less:                 |  |                                                 |   |                    |   |           |      |  
|                      |  | Payments pursuant to executive waiver agreement |   |                    |  |           |      |   | (811 | )
|                      |  |                                                 |   |                    |   |           |      |  
|Ending balance        |  | $                                               |  |                    |   | $         | (202 | )
|                      |  |                                                 |   |                    |   |           |      |  

All merger activities and related expenses were completed in the third
quarter of 2002. Merger costs recorded during the three months ended March 30,
2002 consisted of executive waiver agreement expenses. In accordance with the
executive waiver agreements, payments to the executives occurred at the
one-year anniversary of the Merger, although the executives continued to be
restricted from exercising some of their options and selling the related stock
for an additional six months following the one-year anniversary date. The total
expense related to the waiver agreements of $811,000 was amortized over the
18-month waiver period. As of March 30, 2002, the ending balance of accrued
merger costs was reclassified to prepaid expenses and other in the accompanying
condensed consolidated balance sheet.

Restructuring Costs

From the inception of our plan to consolidate all of our ventricular
assist device, or VAD, manufacturing operations, which we call the
Restructuring Plan, through March 29, 2003, we have recorded $1,556,000 of
restructuring charges in accordance with Emerging Issues Task Force, or EITF,
Issue No. 94-3, and Staff Accounting Bulletin No. 100, Restructuring and
Impairment Charges. These charges represent estimated employee severance costs
and stock option acceleration charges. Since the announcement of the
Restructuring Plan, we have paid approximately $1,261,000 in severance payment
to 74 employees. Early in the second quarter of 2003, we received approval from
the United States Food and Drug Administration, or FDA, to begin manufacturing
our HeartMate VAD products in our Pleasanton, California manufacturing
facility. We have completed the relocation of the HeartMate manufacturing from
Woburn, Massachusetts and final severance costs will be paid in the second
quarter of 2003. The following is a summary of our accrued restructuring costs
activity for the three-month periods ended March 29, 2003 and March 30, 2002
(in thousands):

|                             |                                |   |                    |      |           |   |     |      |  
|---------------------------- | ------------------------------ | - | ------------------ | ---- | --------- | - | --- | ---- | -
|                             |                                |   | Three Months Ended
|                             |                                |   |                   
|                             |                                |   | March 29,          |      | March 30,
|                             |                                |   | 2003               |      | 2002     
|                             |                                |   |                    |      |          
|Accrued Restructuring Costs: |                                |   |                    |      |           |   |     |     
|Beginning balance            |                                | $ | 679                |      |           | $ | 863 |     
|                             | Employee severance accrual     |   |                    |     |           |   |     | 144  |  
|                             | Reduction of accrual           |   |                    | (61  | )         |   |     |     |  
|                             | Payments of employee severance |   |                    | (521 | )         |   |     | (126 | )
|                             |                                |   |                    |      |           |   |     |     
|Ending balance               |                                | $ | 97                 |      |           | $ | 881 |     
|                             |                                |   |                    |      |           |   |     |     

For the three months ended March 29, 2003 and March 30, 2002 in addition
to the employee severance costs, estimated restructuring costs included expense
related to the acceleration of stock options granted to employees who were
terminated under the Restructuring Plan. In the three-month periods ending
March 29, 2003 and March 30, 2002, $4,000 and $40,000, respectively, of stock
option acceleration expense was recorded.

Other Costs

Other costs of $529,000 were incurred in the fourth quarter of 2002
related to the termination of a European distribution agreement. In the first
quarter of 2003, $523,000 of this amount was paid.

9. Income Taxes

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Our effective tax provision rate was 39% for the three-month period ended
March 29, 2003. For the three-month period ended March 30, 2002, our effective
tax benefit rate was 40%. The effective tax provision rate for the first
quarter of 2003 and the effective tax benefit rate for the first quarter of
2002 both differed from the statutory federal income tax rate primarily due to
the impact of state taxes.

At March 29, 2003 and December 28, 2002, we reported a net deferred tax
liability of approximately $57,148,000 and $56,655,000, respectively, comprised
principally of temporary differences between the financial statement and income
tax bases of intangible assets.

10. Net Income (Loss) Per Share

Basic and diluted net income (loss) per share were calculated as follows:

|                                                     |  |                    |        |           |  |   |        |  
|---------------------------------------------------- |  | ------------------ | ------ | --------- |  | - | ------ | -
|                                                     |  | Three Months Ended
|                                                     |  |                   
|                                                     |  | March 29,          |        | March 30,
|                                                     |  | 2003               |        | 2002     
|                                                     |  |                    |        |          
|Net income (loss)                                    |  | $                  | 1,418  |           |  | $ | (1,758 | )
|                                                     |  |                    |        |           |  |   |        |  
|Weighted average number of common shares-basic       |  |                    | 55,057 |           |  |   | 56,650 |  
|Dilutive effect of employee stock options            |  |                    | 477    |           |  |   |       |  
|                                                     |  |                    |        |           |  |   |        |  
|Weighted average number of common shares-diluted     |  |                    | 55,534 |           |  |   | 56,650 |  
|                                                     |  |                    |        |           |  |   |        |  
|Net income (loss) per common share-basic and diluted |  | $                  | 0.03   |           |  | $ | (0.03  | )
|                                                     |  |                    |        |           |  |   |        |  

Basic income (loss) per share is computed by dividing net income (loss) by
the weighted average number of common shares outstanding during the period.
Diluted income (loss) per share reflects the potential dilution that could
occur if securities or other contracts to issue common stock were exercised or
converted into common stock. Of the options to purchase shares of common stock
outstanding as of March 29, 2003, 5,528,000 shares of common stock were not
included in the computation of the diluted income (loss) per share as their
inclusion would be antidilutive. Of the options to purchase shares of common
stock outstanding as of March 30, 2002, all shares were excluded from the
computation of diluted net loss per share as their inclusion would be
antidilutive due to our net loss during the period.

11. Business Segment and Geographical Data

We organize and manage our business by functional operating entities. Our
functional entities operate in two segments: (1) Cardiovascular and (2) ITC.
The Cardiovascular segment develops, manufactures and markets proprietary
medical devices used for circulatory support and vascular graft applications.
The ITC segment develops, manufactures and markets near-patient, whole-blood
coagulation testing equipment and related disposables, as well as premium
quality, single-use skin incision devices.

Business Segments (in thousands):

|                                         |                                           |                                   |     |                    |        |           |      |        |        |  
|---------------------------------------- | ----------------------------------------- | --------------------------------- | --- | ------------------ | ------ | --------- | ---- | ------ | ------ | -
|                                         |                                           |                                   |     | Three Months Ended
|                                         |                                           |                                   |     |                   
|                                         |                                           |                                   |     | March 29,          |        | March 30,
|                                         |                                           |                                   |     | 2003               |        | 2002     
|                                         |                                           |                                   |     |                    |        |          
|Product sales:                           |                                           |                                   |     |                    |        |           |      |       
|                                         | Cardiovascular                            |                                   | $   | 23,908             |        |           | $    | 18,691 |       
|                                         | ITC                                       |                                   |     | 12,154             |        |           |      | 10,948 |       
|                                         |                                           |                                   |     |                    |        |           |      |        |       
|                                         |                                           | Total product sales               |     | $                  | 36,062 |           |      | $      | 29,639 |  
|                                         |                                           |                                   |     |                    |        |           |      |        |       
|Income (loss) before income taxes:       |                                           |                                   |     |                    |        |           |      |       
|                                         | Cardiovascular                            |                                   | $   | 3,788              |        |           | $    | (378   | )     
|                                         | ITC                                       |                                   |     | 2,349              |        |           |      | 2,187  |       
|                                         | Corporate (a)                             |                                   |     | (1,286             | )      |           |      | (956   | )     
|                                         | Amortization of purchased intangibles (b) |                                   |     | (3,096             | )      |           |      | (3,096 | )     
|                                         | Merger, restructuring and other costs (b) |                                   |     | 57                 |        |           |      | (321   | )     
|                                         |                                           |                                   |     |                    |        |           |      |        |       
|                                         |                                           | Total operating income ( loss)    |     |                    | 1,812  |           |      |        | (2,564 | )
|Interest and other income (expense), net |                                           |                                   | 512 |                    |        |           | (368 | )     
|                                         |                                           |                                   |     |                    |        |           |      |        |       
|                                         |                                           | Income (loss) before income taxes |     | $                  | 2,324  |           |      | $      | (2,932 | )
|                                         |                                           |                                   |     |                    |        |           |      |        |       

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---

|(a) |  | Represents primarily general and administrative expenses not specifically
identified to any particular business segment.
|--- |  | ------------------------------------------------------------------------------------------------------------------------
|   
|(b) |  | Related to the Cardiovascular segment.                                                                                  

Geographic Areas (in thousands):

|               |                         |       |   |                    |        |           |   |        |        | 
|-------------- | ----------------------- | ----- | - | ------------------ | ------ | --------- | - | ------ | ------ | 
|               |                         |       |   | Three Months Ended
|               |                         |       |   |                   
|               |                         |       |   | March 29,          |        | March 30,
|               |                         |       |   | 2003               |        | 2002     
|               |                         |       |   |                    |        |          
|Product sales: |                         |       |   |                    |        |           |   |       
|               | Domestic                |       | $ | 30,028             |        |           | $ | 24,751 |       
|               |                         |       |   |                    |        |           |   |        |       
|               | Europe                  |       |   | 4,191              |        |           |   | 3,281  |       
|               | All other international |       |   | 1,843              |        |           |   | 1,607  |       
|               |                         |       |   |                    |        |           |   |        |       
|               | Total international     |       |   | 6,034              |        |           |   | 4,888  |       
|               |                         |       |   |                    |        |           |   |        |       
|               |                         | Total |   | $                  | 36,062 |           |   | $      | 29,639 | 
|               |                         |       |   |                    |        |           |   |        |       

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ITEM 2. MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

Forward-Looking Statements

This Form 10-Q may contain statements that we believe are, or may be
considered to be, forward-looking statements, within the meaning of Section
27A of the Securities Act of 1933 and Section 21E of the Securities Exchange
Act of 1934. These forward-looking statements generally can be identified by
use of statements that include phrases such as believe, expect,
anticipate, intend, plan, foresee, may, hope, will, estimates,
potential, continue or other similar words or phrases. Similarly,
statements that describe our objectives, plans or goals also are
forward-looking statements. All of these forward-looking statements are subject
to risks and uncertainties that could cause our actual results to differ
materially from those contemplated by the relevant forward-looking statement.
The principal risk factors that could cause actual performance and future
actions to differ materially from the forward-looking statements include, but
are not limited to, the results of clinical trials, governmental regulatory
approval processes, plans to develop and market new products, market acceptance
of new products, announcements by our competitors, an intensely competitive
market, the ability to improve financial performance, and other factors
identified in our Annual Report on Form 10-K for 2002 which we filed with the
Securities and Exchange Commission, or the SEC. Readers are urged to consider
these factors carefully in evaluating the forward-looking statements. The
forward-looking statements included in this Form 10-Q are made only as of the
date of this report and we undertake no obligation to publicly update these
forward-looking statements to reflect subsequent events or circumstances.

The following presentation of managements discussion and analysis of our
financial condition and results of operations should be read together with our
consolidated financial statements included in this Form 10-Q, and our Annual
Report on Form 10-K for 2002 filed with the SEC.

Overview

We are a leading manufacturer of circulatory support products for use by
patients with congestive heart failure, or CHF. According to the American Heart
Association, 4.9 million patients in the United States suffer from CHF and an
additional 550,000 patients are diagnosed with this disease annually. We were
the first company to receive U.S. Food and Drug Administration, or FDA,
approval to commercially market a ventricular assist device, or VAD, to treat
patients with late-stage heart failure, which comprises approximately 5% to 10%
of the CHF patient population. Our VADs are used primarily by these CHF
patients to perform some or all of the pumping function of the heart and we
currently offer the widest range of products to serve this market. We believe
that our long-standing reputation for quality and innovation and our excellent
relationships with leading cardiovascular surgeons worldwide position us to
capture growth opportunities in the expanding congestive heart failure market.
We also develop and sell products that are used by physicians and hospitals for
vascular and diagnostic applications that include vascular grafts, blood
coagulation testing and skin incision devices. We conduct business both
domestically and internationally.

The Merger with Thermo Cardiosystems

The Merger of Thoratec with Thermo Cardiosystems, Inc., or TCA, was
completed on February 14, 2001. We issued new shares of our common stock to the
shareholders of TCA in exchange for all the outstanding common stock of TCA at
an exchange ratio of 0.835 shares of Thoratec stock for each share of TCA
stock. The Merger was accounted for as a reverse acquisition because former
shareholders of TCA owned a majority of our outstanding stock subsequent to the
Merger. For accounting purposes, TCA is deemed to have acquired Thoratec.

Restructuring Plan

From the inception of our plan to consolidate all of our VAD manufacturing
operations, which we call the Restructuring Plan, through March 29, 2003, we
have recorded $1.6 million of restructuring charges in accordance with Emerging
Issues Task Force, or EITF, issue No. 94-3, and Staff Accounting Bulletin No.
100, Restructuring and Impairment Charges. These charges represent estimated
employee severance costs and stock option acceleration charges. We have paid
approximately $1.3 million in severance payments to 74 employees since the
commencement of the Restructuring Plan.

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On April 4, 2003, the FDA approved a Pre-Market Approval, or PMA,
Supplement to consolidate our cardiovascular device manufacturing activities at
our Pleasanton, California headquarters. As a result, we will now manufacture
our HeartMate left ventricular assist system, or LVAS, devices in Pleasanton,
ending manufacturing activities at our facility in Woburn, Massachusetts that
we acquired through our Merger. The final severance payments will be made in
the second quarter of 2003.

Other Recent Events

On April 7, 2003, the FDA approved our PMA Supplement allowing the use of
our HeartMate XVE LVAS for Destination Therapy, or the permanent support for
end-stage heart failure patients who are not eligible for heart
transplantation. The XVE is an enhanced version of the HeartMate SNAP-VE device
approved in November 2002 for use for Destination Therapy. The XVE incorporates
a number of significant improvements over earlier versions of the HeartMate VE.
The device changes were designed to ease implantation, provide for longer and
more reliable device life and improve patient outcomes.

Results of Operations

Three months ended March 2003 and 2002

Product Sales

Product sales in the first quarter of 2003 were $36.0 million compared to
$29.6 million in the first quarter of 2002, an increase of approximately $6.4
million, or 22%. This increase is primarily attributable to an increase in the
number of VAD units sold both domestically and internationally of $4.4 million,
higher sales of graft products of $0.8 million, and higher sales of blood
coagulation testing equipment and incision products of $1.2 million.

Gross Profit

Gross profit was $21.2 million, representing 59% of product sales, for the
first quarter of 2003 compared to $16.5 million, representing 56% of product
sales, for the first quarter of 2002. The increase in gross profit percentage
was primarily a result of higher average selling prices for
international VAD products due principally to customer mix between the two periods, lower
merger related employee retention costs and higher sales of higher margin
coagulation products.

Selling, General and Administrative

Selling, general and administrative expenses increased to $10.1 million,
or 28% of product sales, in the first quarter of 2003, from $8.7 million, or
29% of product sales, in the first quarter of 2002. While selling, general and
administrative expenses were generally consistent as a percentage of sales from
period to period, the increase in expense dollars was primarily due to higher
employee related costs, expenses related to increased marketing efforts and
business development activities and increased insurance costs.

Research and Development

Research and development expenses decreased to $6.3 million, or 17% of
product sales, in the first quarter of 2003, from $6.9 million, or 23% of
product sales, in the first quarter of 2002. This decrease was primarily due
to lower spending on certain cardiovascular projects, partially offset by
slightly higher spending on the development of a new hand-held point of
care blood analyzer product.

Amortization of Purchased Intangible Assets

Amortization of identified purchased intangible assets remained consistent
from the first quarter of 2002 to the first quarter of 2003 at $3.0 million.
Intangible assets are being amortized over their estimated useful lives of
eight to twenty years.

Merger, Restructuring and Other Costs

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Merger, restructuring and other costs in the first quarter of 2003 were
$57,000 of reduction in expense compared to $321,000 of expense in the first
quarter of 2002. Merger activities and related expenses were completed in the
third quarter of 2002. Due to the winding down of our restructuring
activities, the restructuring accrual was reduced in the first quarter of 2003
to estimate actual remaining severance activity.

Interest and Other Income
(Expense) - Net

Interest and other income (expense)  net was $0.5 million in the first
quarter of 2003 compared to $(0.4) million in the first quarter of 2002.
Interest expense decreased by $0.5 million and other income (expense) increased
by $0.6 million from 2002 to 2003 primarily due to the repayment of our
subordinated debentures in the first quarter of 2002 and the related write-off
of unamortized debt issuance costs. These increases were partially offset by a
decrease in interest income from 2002 to 2003 due to lower interest rates.

Income Taxes

Our effective income tax expense rate was 39% for the three-month period
ended March 29, 2003. For the three-month period ended March 30, 2002, our
effective income tax benefit rate was 40%. The effective income tax expense
rate for the current fiscal quarter and the effective income tax benefit rate
for the prior fiscal quarter differed from the statutory federal income tax
rate primarily due to the impact of state taxes.

Liquidity and Capital Resources

At March 29, 2003, we had working capital of $111.7 million compared with
$107.9 million at December 28, 2002. Cash and cash equivalents at March 29,
2003 were $48.7 million compared to $42.0 million at December 28, 2002, an
increase of $6.7 million.

During the first three months of 2003, cash provided by operating
activities was $6.2 million. This results from the combination of our net
income of $1.4 million and $5.5 million of items not affecting first quarter
2003 cash flows, primarily depreciation and amortization expenses, less changes
in working capital of $0.7 million. The change in working capital in the first
quarter of 2003 was due principally to a decrease in accounts payable and other
accrued liabilities and increases in inventory and prepaid and other assets,
partially offset by a decrease in accounts receivable. Net cash used in
operating activities of $2.9 million in the first quarter of 2002. This
results from the combination of our net loss of $1.8 million and $4.9 million
of items not affecting first quarter 2002 cash flows, primarily depreciation
and amortization expenses, less changes in working capital of $6.0 million.

During the first three months of 2003, $47,000 of cash was used in our
investing activities compared to $44.6 million of cash provided in the first
three months of 2002. During the first three months of 2003, we purchased $4.4
million in short-term and long-term investments and $1.3 million of cash was
used for capital expenditures. These uses of cash for investing activities
were partially offset by sales of short-term and long-term investments of $5.7
million. Cash provided in the first quarter of 2002 was due to the
reclassification of $45.9 million from restricted cash to retire our
subordinated debentures, partially offset by $1.3 million used for capital
expenditures.

During the first three months of 2003, $0.6 million of cash was provided
by financing activities compared to $40.6 million of cash used in financing
activities in the first three months of 2002. Cash provided in the first
quarter of 2003 was due to proceeds from the exercise of common stock options.
Cash used in the first quarter of 2002 was due to $54.8 million to retire our
subordinated debentures and $1.8 million to repurchase our common stock,
partially offset by $15.5 million net proceeds received in a public stock
offering and $0.6 million provided from exercises of common stock options.

We believe that our cash on-hand, short-term available-for-sale
investments and expected cash flow from operations will be sufficient to fund
our operations and capital requirements for the foreseeable future. We expect
that our operating expenses will increase in future periods as we spend more on
product manufacturing, marketing and research and development of new product
lines.

The impact of inflation on our financial position and results of
operations was not significant during the three-month periods ended March 2003
and March 2002.

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Critical Accounting Policies

We have identified certain accounting policies as critical to our business
operations and the understanding of our results of operations. The impact and
associated risks related to those policies on our business operations is
discussed below and in our fiscal 2002 consolidated financial statements filed
with the SEC in our annual report on Form 10-K.

In April 2002, the FASB issued SFAS No. 145, (Rescission of FASB
Statements 4, 44, and 64, Amendment of FASB Statement No. 13, and Technical
Corrections) which, among other things, changed the presentation of gains and
losses on the extinguishment of debt. Any gain or loss on extinguishment of
debt that does not meet the criteria in Accounting Principle Board, or APB,
Opinion No. 30, Reporting the Results of Operations - Reporting the Effects of
Disposal of a Segment of a Business, and Extraordinary, Unusual and
Infrequently Occurring Events and Transactions, shall be included in operating
earnings and not presented separately as an extraordinary item. We adopted SFAS
No. 145 at the beginning of fiscal year 2003. Upon adoption, we reclassified
the extraordinary loss incurred in 2002 of $0.5 million to interest and other
income (expense)-net.

In December 2002, the FASB issued SFAS No. 148, Accounting for
Stock-Based Compensation-Transition and Disclosure. SFAS No. 148 amends SFAS
No. 123, Accounting for Stock-Based Compensation, to provide alternative
methods of transition for a voluntary change to the fair value based method of
accounting for stock-based employee compensation. In addition, SFAS No. 148
amends the disclosure requirements of SFAS No. 123 to require prominent
disclosures in both annual and interim financial statements of the method of
accounting for stock-based employee compensation and the effect of the method
used on reported results. SFAS No. 148 is effective for fiscal years beginning
after December 15, 2002. We adopted the disclosure provisions of SFAS No. 148
at the beginning of fiscal 2003. We do not expect to change to use the fair
value based method of accounting for stock-based financial position, results of
operations or cash flows.




ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE OF MARKET RISK

Short-Term and Long-Term Investments

Our exposure to market risk for changes in interest rates relates to our
investment portfolio. The investment portfolio is made up of cash equivalent
and marketable security investments in money market funds and debt instruments
of government agencies and high quality corporate issuers. All investments are
carried at market value and are treated as available-for-sale. All investments
mature within two years or less from the date of purchase. The holdings of any
one issuer, except government agencies, do not exceed 10% of the portfolio. If
interest rates rise, the market value of our investments may decline which
could result in a loss if we are forced to sell an investment before the
scheduled maturity. We do not utilize derivative financial instruments to
manage interest rate risks.

Foreign Currency Rate Fluctuations

We conduct business in foreign countries. Our international operations
consist primarily of sales and service personnel for our ventricular assist
products. The employees report into our U.S. sales and marketing group and are
internally reported as part of that group. All assets and liabilities of our
non-U.S. operations are translated into U.S. dollars at the period-end exchange
rates. The resulting translation adjustments are included in comprehensive
income. The period-end translation of the non-functional currency balances (the
result of foreign sales, foreign expenses, and intercompany transactions) in
our wholly owned subsidiary in the United Kingdom at the period-end exchange
rate into the functional currency of our subsidiary results in foreign currency
exchange gains and losses. These foreign currency exchange gains and losses are
included in interest and other income-net and were not material for the
three-month periods ended March 29, 2003 and March 30, 2002. Currently, we do
not expect to be subject to material foreign currency risk with respect to
future costs or cash flows from our foreign operations. To date, we have not
entered into any significant foreign currency hedging contracts or other
derivative financial instruments to hedge the effects of adverse fluctuations
in foreign currency exchange, however, we are currently evaluating possible
future use of such contracts and instruments.




ITEM 4. CONTROLS AND PROCEDURES

An evaluation was performed under the supervision and with the
participation of our management, including our Chief Executive Officer and
Chief Financial Officer, of the effectiveness of the design and operation of
our disclosure controls and procedures within 90 days before the filing date of
this quarterly report. Based on that evaluation, our management, including the
Chief Executive Officer and Chief Financial Officer, concluded that the
Companys disclosure controls and procedures were effective. There have been no
significant changes in our internal controls or in other factors that could
significantly affect disclosure controls subsequent to their evaluation.

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Our management, including the Chief Executive Officer and the Chief
Financial Officer, do not expect that the disclosure controls and procedures or
internal controls will prevent all error and all fraud. A control system, no
matter how well conceived and operated, provides reasonable assurance that the
objectives of the control system are met. The design of a control system
reflects resource constraints; the benefits of controls must be considered
relative to their costs. Because there are inherent limitations in all control
systems, no evaluation of controls can provide absolute assurance that all
control issues and instances of fraud, if any, within the Company have been or
will be detected. These inherent limitations include the realities that
judgments in decision-making can be faulty and that breakdowns occur because of
simple error or mistake. Controls can be circumvented by the individual acts
of some persons, by collusion of two or more people, or by management override
of the control. The design of any system of controls is based in part upon
certain assumptions about the likelihood of future events. There can be no
assurance that any design will succeed in achieving its stated goals under all
future conditions; over time, controls may become inadequate because of changes
in conditions or deterioration in the degree of compliance with the policies or
procedures. Because of the inherent limitations in a cost-effective control
system, misstatements due to error or fraud may occur and not be detected.

We intend to review and evaluate the design and effectiveness of our
disclosure controls and procedures on an ongoing basis and to improve our
controls and procedures over time and to correct any deficiencies that we may
discover in the future. Our goal is to ensure that our senior management has
timely access to all material financial and non-financial information
concerning our business. While we believe the present design of our disclosure
controls and procedures is effective to achieve our goal, future events
affecting our business may cause us to significantly modify our disclosure
controls and procedures.




PART II. OTHER INFORMATION




ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K



|(a) |  | Exhibits:
|--- |  | ---------



| | 10.1 |  | Lease Agreement Between NJ Mortgage Acquisition, LLC and International Technidyne
Corporation Dated February 21, 2003. 
| | ---- |  | -----------------------------------------------------------------------------------------------------------------------
|
| | 10.2 |  | Lease Agreement Between Franklin Four LLC and Thoratec Corporation Dated January 8, 2003.                              
|
| | 99.1 |  | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002.



|(b) |  | Reports on Form 8-K:
|--- |  | --------------------
|   
|    |  | None.               

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SIGNATURES

In accordance with the requirements of the Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

|                   |  |                                                                                                                             
|------------------ |  | ----------------------------------------------------------------------------------------------------------------------------
|                   |  | THORATEC CORPORATION                                                                                                        
|                   |  |                                                                                                                             
|Date: May 13, 2003 |  | /s/ D. Keith Grossman                                                                                                       
|                   |  |                                                                                                                             
|                   |  | D. Keith Grossman,
Chief Executive Officer                                                                                  
|                   |  |                                                                                                                             
|Date: May 13, 2003 |  | /s/ M. Wayne Boylston                                                                                                       
|                   |  |                                                                                                                             
|                   |  | M. Wayne Boylston,
Senior Vice President,
Chief Financial Officer and Secretary
(Principal Financial and Accounting Officer)

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CERTIFICATION
OF CHIEF EXECUTIVE OFFICER

I, D. Keith Grossman, Chief Executive Officer, certify that:



|1. |  | I have reviewed this quarterly report on Form 10-Q of Thoratec
Corporation;                                                                                                                                                                                                                                                   
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to
make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by
this quarterly report;
|  
|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and cash
flows of the registrant as of, and for, the period presented in this
quarterly report;                    
|  
|4. |  | The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we
have:                                                                                                      



| | a. |  | Designed such disclosure controls and procedures to ensure that
material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this quarterly report
is being prepared;
| | -- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b. |  | Evaluated the effectiveness of the registrants disclosure controls
and procedures as of a date within 90 days prior to the filing date of
this quarterly report (the Evaluation Date); and                                                                                                  
|
| | c. |  | Presented in this quarterly report our conclusions about the
effectiveness of the disclosure controls and procedures based on our
evaluation as of the Evaluation Date;                                                                                                                        



|5. |  | The registrants other certifying officer and I have disclosed, based on
our most recent evaluation, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the
equivalent function):
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. |  | All significant deficiencies in the design or operation of internal
controls which could adversely affect the registrants ability to
record, process, summarize and report financial data and have
identified for the registrants auditors any material weaknesses in
internal controls; and
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b. |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants
internal controls; and                                                                                                                                        



|6. |  | The registrants other certifying officer and I have indicated in this
quarterly report whether or not there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation, including
any corrective actions with regard to significant deficiencies and
material weaknesses.
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|                   |  |                                           
|------------------ |  | ------------------------------------------
|Date: May 13, 2003 |  | /s/ D. Keith Grossman                     
|                   |  |                                           
|                   |  | D. Keith Grossman,
Chief Executive Officer

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##### Table of Contents



CERTIFICATION
OF CHIEF FINANCIAL OFFICER

I, M. Wayne Boylston, Chief Financial Officer, certify that:



|1. |  | I have reviewed this quarterly report on Form 10-Q of Thoratec
Corporation;                                                                                                                                                                                                                                                   
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to
make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by
this quarterly report;
|  
|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and cash
flows of the registrant as of, and for, the period presented in this
quarterly report;                    
|  
|4. |  | The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we
have:                                                                                                      



| | a. |  | Designed such disclosure controls and procedures to ensure that
material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this quarterly report
is being prepared;
| | -- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b. |  | Evaluated the effectiveness of the registrants disclosure controls
and procedures as of a date within 90 days prior to the filing date of
this quarterly report (the Evaluation Date); and                                                                                                  
|
| | c. |  | Presented in this quarterly report our conclusions about the
effectiveness of the disclosure controls and procedures based on our
evaluation as of the Evaluation Date;                                                                                                                        



|5. |  | The registrants other certifying officer and I have disclosed, based on
our most recent evaluation, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the
equivalent function):
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d. |  | All significant deficiencies in the design or operation of internal
controls which could adversely affect the registrants ability to
record, process, summarize and report financial data and have
identified for the registrants auditors any material weaknesses in
internal controls; and
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | c. |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants
internal controls; and                                                                                                                                        



|6. |  | The registrants other certifying officer and I have indicated in this
quarterly report whether or not there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation, including
any corrective actions with regard to significant deficiencies and
material weaknesses.
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|                   |  |                                                                 
|------------------ |  | ----------------------------------------------------------------
|Date: May 13, 2003 |  | /s/ M. Wayne Boylston                                           
|                   |  |                                                                 
|                   |  | M. Wayne Boylston
Senior Vice President, Chief Financial Officer

21