UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM 10-K
(Mark One)

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2009

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE EXCHANGE ACT
For the transition period from to Commission File No. 0-28882

WORLD HEART CORPORATION
Delaware (State or other Jurisdiction of Incorporation or Organization) 4750 Wiley Post Way, Suite 120 Salt Lake City, Utah USA (Address of Principal Executive Office) (801) 355-6255 (Registrant’s Telephone Number) Securities registered pursuant to Section 12(b) of the Exchange Act:
Title of each class Name of each exchange on which registered

52-2247240 (I.R.S. Employer Identification No.) 84116 (Zip Code)

Common Stock, $0.001 par value

NASDAQ Capital Market

Securities registered pursuant to Section 12(g) of the Exchange Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Exchange Act. Yes No Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act 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 No Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post