Patent ID: 8398382
Filing Date: 2013-03-19
Classification: A61M,F04D

Abstract:
1. A turbo type blood pump, comprising: a housing having a pump chamber, an inlet port, and an outlet port; an impeller supported rotatably in the pump chamber; and a drive force transmitting element for rotating the impeller, the impeller including: a rotating shaft supported rotatably by an upper bearing and a lower bearing at upper and lower ends; a plurality of vanes; an arm coupling an inner circumferential side of at least a part of the vanes to the rotating shaft; an annular coupling portion coupled to each outer circumferential side of the vanes; and a driven magnet portion placed in a lower portion of the annular coupling portion, the drive force transmitting element being configured in such a manner that a drive magnet portion provided at a rotatable rotor positioned in an outside lower portion of the housing and the driven magnet portion of the impeller are opposed to each other with a bottom wall of the housing interposed therebetween, whereby rotation of the rotor is transmitted to the impeller through magnetic coupling, wherein a base having a cylindrical outer circumferential surface protruding upward is formed at a center in a bottom portion of the housing so as to correspond to a space in a region of a lower portion of the impeller surrounded by a cylindrical inner circumferential surface that is formed by the annular coupling portion and the driven magnet portion, the lower bearing is provided at the base, the impeller includes a blockade member extending inwardly from an inner edge of the annular coupling portion over the upper surface of the base, so as to be interposed between a lower surface of the vanes and an upper surface of the base in a region spreading between the rotating shaft and the annular coupling portion, and the blockade member is a single piece structure and blocks a space in the region spreading between the rotating shaft and the inner edge of the annular coupling portion while leaving only an opening for a part of the space around the rotating shaft above the base.