A circulatory assistance device for implantation in the human body to assist a failing heart. The device comprises a truncated conical structure, made up of rigid pieces connected by volumetric reduction columns which contain electromechanical means for exerting alternating stress and mechanical means...http://www.google.ca/patents/US4506658?utm_source=gb-gplus-sharePatent US4506658 - Pericardiac circulatory assistance device
