Patent ID: 9415147
Filing Date: 2016-08-16
CPC Classification: A61M

Claim Text:
1. A blood pump comprising: a pump housing, wherein the pump housing provides an inlet, an outlet, and a bearing surface, wherein the pump is configured to move blood from the inlet to the outlet; an impeller housed in the pump housing and having a plurality of blades joined by a central ring having an internal surface, wherein the impeller is radially supported by a hydrodynamic bearing formed by the internal surface and the bearing surface; a hub configured to rotate about an axis and comprising a first permanent magnet, wherein the impeller comprises a second permanent magnet located within the central ring, the first permanent magnet and the second permanent magnet (i) being arranged to attract to each other in a radial direction perpendicular to the axis, and (ii) forming a radial magnetic coupling to transmit torque from the hub to the impeller; wherein a maximum height of the plurality of blades overlaps with each of the internal surface and the radial magnetic coupling, the maximum height being in a direction of the axis; wherein a topmost extent of the plurality of blades is axially closer to the inlet than is (a) a topmost extent of the internal surface and (b) a bottom of the plurality of blades.