CENTRIFUGAL PUMP DEVICE

摘要

A centrifugal blood pump device wherein first permanent magnets (15a, 15b) are provided to one surface of an impeller (10), second permanent magnets (16a, 16b) are provided to the inner wall of a blood chamber (7), third permanent magnets (50) are provided to the other surface of the impeller (10), and the centrifugal blood pump device is provided with fourth permanent magnets (51) and a rotor (52) which rotationally drive the impeller (10) through the partition wall (6). The amount (?F1) of variation in the attraction force (F1) between the first permanent magnets (15a, 15b) and the second permanent magnets (16a, 16b) and the amount (?F2) of variation in the attraction force (F2) between the third and fourth permanent magnets (50, 51), said variations being those which occur when the impeller (10) is eccentrically located, are made to be substantially agree with each other. Accordingly, the floating position of the impeller (10) can be always maintained at substantially the center within a housing (2).