Patent ID: 6884210

Claim:
A centrifugal blood pump comprising: a centrifugal impeller including at least one magnet embedded the centrifugal impeller, a casing having a suction inlet and a delivery outlet and rotatably encasing the impeller, a magnetic drive means for rotating the impeller by magnetically acting from outside of the casing on a said at least one magnet, a magnetic attraction force adjustment means for adjusting the attraction force by the magnetic action, a control means for rotating speed of said magnetic drive means, and a pair of pivot bearings for supporting pivots at both ends of the impeller rotation shaft, wherein the distance between bearing faces of said both pivot bearings is set longer than the length of the rotation shaft of the impeller and the rotation speed of the impeller is controlled to a predetermined speed by said control means for rotating speed so as to levitate the impeller in the blood flow in the casing and to prevent the pivots at both ends of the rotation shaft of the impeller from contacting the bearing faces of said both pivot bearings.