High efficiency blood pump
First Claim
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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.
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Abstract
A high efficiency blood pump includes a pump housing, wherein the pump housing provides an inlet and outlet. The pump includes a motor housing, wherein the motor housing contains a motor. An impeller is housed in the pump housing, wherein the impeller is radially supported by a hydrodynamic bearing providing at least one row of pattern grooves. A diaphragm provided by the pump housing separates the impeller chamber from the motor chamber. A magnetic coupling is provided between the motor and the impeller, wherein the magnetic coupling causes the impeller to rotate when the motor rotates and provides axial restraint of the impeller.
67 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; 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. - 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