A blood pumping system with a non-occlusive blood pump has a backflow warning generator to generate a warning to indicate that undesirable backflow of blood through the non-occlusive blood pump may be impending. The backflow warning generator comprises a microprocessor that executes a backflow alert...http://www.google.fr/patents/US5171212?utm_source=gb-gplus-shareBrevet US5171212 - Blood pumping system with backflow warning
