**Exhibit 4.1**

 

| ****       | ****                                                                                                                                                                                                                                                                                                              | ****                 |
|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------|
| ** ** | COMMON  SHARES                                                                                                                                                                                                                                                                                                    | ****                 | COMMON SHARES | ** ** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | ** ** |
| ** ** | THIS CERTIFICATE IS                                                                                                                                                                                                                                                                                               | ** **           | ** ** |
| ** ** | TRANSFERABLE IN THE                                                                                                                                                                                                                                                                                               | ** **           | ** ** |
| WH00460    | ** **                                                                                                                                                                                                                                                                                                        | CITY OF TORONTO,     | ** ** | ** ** | SPECIMEN |
| NUMBER     | ** **                                                                                                                                                                                                                                                                                                        | ONTARIO OR NEW YORK, | ** ** | ** ** | SHARES |
| ****       | ** **                                                                                                                                                                                                                                                                                                        | NEW YORK             | ** ** | ** ** | **** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | ** ** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | ** ** |
| ** ** | INCORPORATED UNDER THE                                                                                                                                                                                                                                                                                            | SEE REVERSE FOR      | ** ** |
| ** ** | LAWS OF CANADA                                                                                                                                                                                                                                                                                                    | CERTAIN DEFINITIONS  | ** ** |
| ** ** | OF  ONTARIO                                                                                                                                                                                                                                                                                                       | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | **CUSIP 980905 20 2** | ** ** |
| ** ** | **WORLD HEART CORPORATION**                                                                                                                                                                                                                                                                                       | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | THIS  CERTIFIES THAT                                                                                                                                                                                                                                                                                              |                 |   | ** ** |
| ** ** |                                                                                                                                                                                                                                                                                                              |                 |   | ** ** |
| ** ** | SPECIMEN                                                                                                                                                                                                                                                                                                          |                 |   | ** ** |
| ** ** |                                                                                                                                                                                                                                                                                                              |                 | SPECIMEN | ** ** |
| ** ** |                                                                                                                                                                                                                                                                                                              |                 |   | ** ** |
| ** ** | *is  the owner of*                                                                                                                                                                                                                                                                                                | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | FULLY  PAID AND NON-ASSESSABLE COMMON SHARES, WITHOUT NOMINAL OR PAR VALUE, OF                                                                                                                                                                                                                                    | ** **           |
| ** ** |                                                                                                                                                                                                                                                                                                              | ** **           |
| ** ** | **WORLD HEART CORPORATION**                                                                                                                                                                                                                                                                                       | ** **           |
| ** ** | *transferable  on the books of the Corporation by the holder hereof in person or by duly  authorized attorney, upon surrender of this Certificate duly endorsed. Holders  may surrender this Certificate to the Transfer Agent and Registrar in Toronto  or the Co-Transfer Agent and Co-Registrar, in New York.* | ** **           |
| ** ** | *In Witness Whereof, the Corporation has caused  this Certificate to be signed in facsimile by its duly authorized officers  and a facsimile of its corporate seal to be affixed.*                                                                                                                                | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | *Dated:*                                                                                                                                                                                                                                                                                                          | SPECIMEN             | ** ** | ** ** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           |
| ** ** | COUNTERSIGNED AND REGISTERED:                                                                                                                                                                                                                                                                                     | ** **           | **CHASE MELLON SHAREHOLDER** |   |  | ** ** |
| ** ** | **CIBC MELLON TRUST COMPANY**                                                                                                                                                                                                                                                                                     | ** **           | **SERVICES LLC** | ** ** | CHAIRMAN | ** ** |
| ** ** | *Transfer Agent and Registrar*                                                                                                                                                                                                                                                                                    |                 | *Co-Transfer Agent and Co-Registrar* | ** ** | ** ** | ** ** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | ** ** | ** ** | ** ** |
| ** ** | ** **                                                                                                                                                                                                                                                                                                        | ** **           | ** ** | ** ** | ** ** |
| ** ** | BY:                                                                                                                                                                                                                                                                                                               |                 | ** ** | BY: | ** ** | ** ** | ** ** |
| ** ** |                                                                                                                                                                                                                                                                                                              |                 |   | ** ** | ****

** ** | ** ** |
| ** ** | AUTHORIZED OFFICER                                                                                                                                                                                                                                                                                                | ** **           | AUTHORIZED OFFICER | ** ** | SECRETARY | ** ** |
|            |                                                                                                                                                                                                                                                                                                                   |                      |  |  |  |  |  |  |  |  |  |  |  |  |

 

----

 

THE CLASSOF SHARES THAT THIS CERTIFICATE REPRESENTS HAS RIGHTS, PRIVILEGES,RESTRICTIONS AND CONDITIONS ATTACHED THERETO AND THE CORPORATION WILL FURNISHTO A SHAREHOLDER, ON DEMAND AND WITHOUT CHARGE, A FULL COPY OF THE TEXT OF (i)THE RIGHTS, PRIVILEGES, RESTRICTIONS AND CONDITIONS ATTACHED TO EACH CLASSAUTHORIZED TO BE ISSUED AND TO EACH SERIES INSOFAR AS THE SAME HAVE BEEN FIXEDBY THE DIRECTORS, AND (ii) THE AUTHORITY OF THE DIRECTORS TO FIX THE RIGHTS,PRIVILEGES, RESTRICTIONS AND CONDITIONS OF SUBSEQUENT SERIES.

 

The following abbreviations, when used in theinscription on the face of this certificate, shall be construed as though theywere written out in full according to applicable laws or regulations:

 
| TEN COM | — | as tenants in common                       |   | UNIF TRAN MIN ACT                          | Custodian                  |
|---------|--------|--------------------------------------------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------|
| TEN ENT | — | as tenants by the entireties               |   | (Cust)                                                                                                                                                                  | (Minor)                                                                                                         |
| JT TEN  | — | as joint tenants with right of             |   | under  Uniform Transfers to Minors Act                                                                                                                                  |
|    |   | survivorship and not as  tenants in common |   |                                                                                                                                                                    |
|    |   |                                       |   | (State)                                                                                                                                                                 |                                                                                                            |
|    |   |                                       |   |                                                                                                                                                                    |
|    |   |                                       |   | UNIF GIFT MIN ACT                                         | Custodian                            |
|    |   |                                       |   | (Cust)                                                                                            | (Minor)                                                                                                         |
|    |   |                                       |   | under  Uniform Gifts to Minors Act                                                                                                                                      |
|    |   |                                       |   |                                                                                                                                                                    |
|    |   |                                       |   | (State)                                                                                                                                                                 |                                                                                                            |
|         |        |                                            |        |                                                                                                                                                                         |                                                                                                                 |  |  |

 

Additionalabbreviations may also be used though not in the above list.

 

| *For Value  Received,                                                             hereby  sell, assign and transfer unto* |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| PLEASE  INSERT SOCIAL SECURITY OR  OTHER IDENTIFYING NUMBER OF ASSIGNEE                                                                                                                                                                                                                                                                                                                                                                    |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |
| (PLEASE  PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE)                                                                                                                                                                                                                                                                                                                                                              |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       | *Common Shares* |
| *of the Corporation represented  by the within Certificate, and do hereby irrevocably constitute and appoint*                                                                                                                                                                                                                                                                                                                              |
| * *                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       | *Attorney* |
| *to transfer the said stock on  the books of the within named Corporation with full power of substitution in  the premises.*                                                                                                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| *Dated:*                                                                                                                                                                                                                                                                                                                                                                                                                                   | * * | * * |
|                                                                                                                                                                                                                                                                                                                                                                                                                                            |  |  |  |  |

 

 

|                     |                                                                                                                                                                                                     |
|--------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                     | **NOTICE**: The signature to this assignment must  correspond with the name as written upon the face of this certificate in  every particular, without alteration or enlargement or any change whatever. |
|                     |                                                                                                                                                                                                     |
| SIGNATURE(S) GUARANTEED: |                                                                                                                                                                                                     |

 

 

| By     |                                                                                                                                                                                                                                                        |   |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
|   | THE SIGNATURE(S) SHOULD BE  GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings  and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED  SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. |   |

 

----