A dynamic blood pump includes a rotating core member and rotating ring portion effective to pre-spin blood before the blood enteres helical pumping channels of the pump. The blood is pumped and further rotated as it moves axially along the helical channels toward a centrifugal section of the pump. At...http://www.google.fr/patents/US5501574?utm_source=gb-gplus-shareBrevet US5501574 - Blood pump
