The Jarvik2000® Ventricular Assist Device is named as a "booster" pump. It is Implanted inside a complete biological heart and helps the left ventricle expel blood. The flow produced by Jarvik 2000 is synchronized with the heartbeat, so the blood moves with natural pulses. Most patients with heart failure retain sufficient cardiac function to make this support more reliable, effective and comfortable than an artificial heart or device that produces total output of a healthy heart.