Patent ID: 6080133
Filing Date: 2000-06-27
Classification: A61M,F16C,H02K,Y10S

Abstract:
A sealless blood pump, comprising:a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including a outlet;a rotor mounted for rotation within said housing, said rotor having a shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing;radial magnetic bearings carried by said shaft portion, and radial magnetic bearings carried by said housing for maintaining said shaft portion of said rotor within said inlet tube of said housing;a rotor motor, said motor including a plurality of permanent magnets carried by said impeller and a motor stator including an electrically conductive coil located within said housing; anda ring of back iron carried by said impeller to aid in completing a flux return path for said permanent magnets, said ring of back iron being located at the forward side of said impeller and within said casing.