An axial flow rotary blood pump including an impeller (5) adapted to be magnetically rotated within a housing by the interaction of magnets disposed on or in the impeller and stators disposed on or in the housing. The impeller includes at least one support ring (2) supporting a plurality of blades (4),...http://www.google.com.au/patents/US7798952?utm_source=gb-gplus-sharePatent US7798952 - Axial flow blood pump
