Thoratec Corporation is a United States-based company that develops, manufactures, and markets proprietary medical devices used for mechanical circulatory support for the treatment of heart-failure patients worldwide. It is a global leader in mechanical circulatory support devices, particularly in ventricular assist devices (VADs). For chronic circulatory support for late-stage heart-failure patients, Thoratecs primary product lines are its ventricular assist devices: the HeartMate II Left Ventricular Assist System (HeartMate II), and the Thoratec Paracorporeal Ventricular Assist Device (PVAD). For acute circulatory support, the companys product lines are the CentriMag Acute Circulatory System (CentriMag); and for pediatric patients the PediMag Acute Circulatory System, known as PediVAS outside the U.S. Incorporated in 1976, Thoratec is headquartered in Pleasanton, California. In 2015 the company was acquired by St. Jude Medical, a global medical-device company headquartered in Saint Paul, Minnesota.