Patent ID: 8123503
Filing Date: 2012-02-28
Classification: A61M,Y10S

Abstract:
1. A disposable centrifugal blood pump with magnetic coupling comprising: a disposable housing including a top surface, a side surface and a bottom with an inflow at the top surface and an outflow at the side surface; and a stator as a reusable part to which the housing is detachably attached, wherein the housing includes in the interior thereof: a cylindrical rotor being formed of magnetic material, the cylindrical rotor having an outer peripheral surface, and inner peripheral surface and ring-shaped pole faces extending along a circumferential direction of the outer peripheral surface thereof so as to project therefrom, the cylindrical rotor having a plurality of pole faces projecting inward from the inner peripheral surface; and an impeller integrated to the rotor, wherein said stator includes: three or more electromagnets for electromagnetic coupling, the three or more electromagnets being arranged around the housing at regular intervals and having pole faces opposed to the pole faces projected from the outer peripheral surface of the rotor, the electromagnets generating a magnetic coupling between the stator and the rotor; a torque transmission disk being formed by sandwiching a ring-shaped permanent magnet magnetized in an axial direction between an upper ring member and a lower ring member, the upper and lower ring members being formed of magnetic material and having a plurality of pole faces corresponding to the pole faces projecting from the inner peripheral surface of the rotor for generating a magnetic coupling between the stator and the rotor; a motor arranged apart from said housing for rotating the torque transmission disk; and a displacement gauge for measuring displacement of the rotor in the radial direction, and wherein the bottom of the housing is formed into a cylindrical shape along a contour shape of the rotor and detachably attached between said stator electromagnets and the torque transmission disk.