A unified, non-blood contacting, implantable heart assist system surrounds the natural heart and provides circumferential contraction in synchrony with the heart's natural contractions. The pumping unit is composed of adjacent tube pairs arranged along a bias with respect to the axis of the heart and...http://www.google.es/patents/US6540659?utm_source=gb-gplus-sharePatente US6540659 - Cardiac assistance systems having bi-directional pumping elements
Cardiac assistance systems having bi-directional pumping elements
