Thoratec Corp develops, manufactures and markets proprietary medical devices used for circulatory support, vascular graft, blood coagulation and skin incision applications. They currently market the Thoratec Ventricular Assist Device System (called Thoratec VAD System or VAD System) and the HeartMate Left Ventricular Assist System (called HeartMate LVAS) in the United States and internationally for use as a bridge to heart transplant. They have also developed small diameter vascular grafts for use in hemodialysis access and coronary artery bypass surgery.