High efficiency blood pump
First Claim
Patent Images
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; and
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 each of the plurality of blades defines a radially innermost edge that extends parallel relative to the axis, and wherein a maximum cross-sectional dimension, normal to the axis, of a shape inscribed by the innermost edges of the plurality of blades is greater than a maximum cross-sectional dimension, normal to the axis, of the internal surface;
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.
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Abstract
A blood pump can include a pump housing, an impeller, and a hub. The pump housing can be configured to move blood from an inlet to an outlet thereof. The impeller can be housed in the pump housing, have a plurality of blades joined by a central ring, and be radially supported at the central ring by a bearing. The hub can transmit torque to the impeller using a radial magnetic coupling.
63 Citations
18 Claims
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1. A blood pump comprising:
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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; and 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 each of the plurality of blades defines a radially innermost edge that extends parallel relative to the axis, and wherein a maximum cross-sectional dimension, normal to the axis, of a shape inscribed by the innermost edges of the plurality of blades is greater than a maximum cross-sectional dimension, normal to the axis, of the internal surface; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification