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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549
FORM 8-K
Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of report (Date of earliest event reported): October 25, 2005
THORATEC CORPORATION

(Exact name of registrant as specified in its charter)
California
(State of Other Jurisdiction of Incorporation)
     
1-8145   94-2340464
 
(Commission File Number)   (IRS Employer Identification
Number)

6035 Stoneridge Drive
Pleasanton, California 94588

(Address of principal executive offices including zip code)
(925) 847-8600
(Registrant’s telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

     
o   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
 
o   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
 
o   Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
 
o   Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Item 2.02 Results of Operations and Financial Condition
Signature
EXHIBIT INDEX
EXHIBIT 99.1

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Item 2.02 Results of Operations and Financial Condition

On October 25, 2005, Thoratec Corporation (the “Company”) issued a press release announcing its fiscal 2005 third quarter results, the text of which is attached hereto as Exhibit 99.1.

The information in this Current Report on Form 8-K, including the exhibit, is furnished pursuant to Item 2.02 and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section. Furthermore, the information in the Current Report on Form 8-K, including the exhibit, shall not be deemed to be incorporated by reference into the filings of the Company under the Securities Act of 1933, as amended.

     
No.
   Exhibit
99.1
  Press Release, dated October 25, 2005, regarding fiscal 2005 third quarter results.

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Signature

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

           
  Dated as of October 25, 2005        
           
    THORATEC CORPORATION
           
    By:   /s/ D. Keith Grossman
       
        D. Keith Grossman 
        Chief Executive Officer 

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EXHIBIT INDEX

     
Exhibit No.
   Description
99.1
  Press Release issued by Thoratec Corporation, dated October 25, 2005.

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