It is an object of the present invention to realize a small and light blood pump
that can control thrombosis and moreover, endure a prolonged use.
A blood pump comprising an 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 magnet that
the impeller includes, a magnetic attraction force adjustment means for adjusting
the attraction force by said 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 maintain out of contact between
the pivots at both ends of the rotation shaft of the impeller and the bearing face
of said both pivot bearing.
