Medium-term pulsatile uni- and biventricular assist devices

Because of the disadvantages that have been shown for non-pulsatile assist devices, devices with pulsatile flow have been developed. In all of these systems, blood flow is generated by compression of a pump sac or diaphragm usually made of polyurethane. The direction of blood flow is regulated by valves in the inlet and outlet tracts of the systems. The motor of these systems, which can be pericorporeal or implanted intracorporeally, is either pneumatic or electric.