Axial flow pump with multi-grooved rotor
First Claim
1. A blood pump, comprising:
- a pump housing;
a rotor positioned within the housing, the rotor having an axis of rotation, a leading edge at an upstream end of the rotor and a trailing edge at a downstream end of the rotor, the rotor comprising peripheral land surfaces defined by one or more flow channels extending from the leading edge to the trailing edge, a collective width of the flow channels in a circumferential direction of the rotor at each of a plurality of axial positions on a radial periphery of the rotor being less than a collective total width of the peripheral land surfaces in the circumferential direction at the plurality of axial positions, the rotor further having a hydrodynamic bearing surface configured to enable the rotor to rotate freely suspended, the rotor including a plurality of magnetic poles; and
a stator including an electrically activated coil configured to magnetically interact with the magnetic poles to cause the rotor to rotate.
1 Assignment
0 Petitions
Accused Products
Abstract
An axial-flow blood pump for pumping blood includes a substantially cylindrical outer enclosure. A tubular housing concentric with and located within the outer enclosure has at one end an inlet and at an opposite end an outlet. A motor stator is concentric with and located between the outer enclosure and the tubular housing. An impeller is concentric with and located within the tubular housing. The impeller is suspended in operation by a combination of passive magnetic forces between magnets within the impeller or magnetized regions of the impeller and the motor stator and hydrodynamic thrust forces generated as blood flows between the tubular housing and a plurality of hydrodynamic thrust bearing surfaces located on the impeller. A volute may be in fluid-tight connection with the outlet of the tubular housing for receiving blood in the axial direction and directing blood in a direction normal to the axial direction. The volute has a flow-improving member extending axially from the volute and into and coaxially with the tubular housing.
139 Citations
20 Claims
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1. A blood pump, comprising:
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a pump housing; a rotor positioned within the housing, the rotor having an axis of rotation, a leading edge at an upstream end of the rotor and a trailing edge at a downstream end of the rotor, the rotor comprising peripheral land surfaces defined by one or more flow channels extending from the leading edge to the trailing edge, a collective width of the flow channels in a circumferential direction of the rotor at each of a plurality of axial positions on a radial periphery of the rotor being less than a collective total width of the peripheral land surfaces in the circumferential direction at the plurality of axial positions, the rotor further having a hydrodynamic bearing surface configured to enable the rotor to rotate freely suspended, the rotor including a plurality of magnetic poles; and a stator including an electrically activated coil configured to magnetically interact with the magnetic poles to cause the rotor to rotate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A blood pump, comprising:
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a pump housing; a rotor for pumping blood positioned in the housing, the rotor having an axis of rotation, a leading edge at a blood upstream end of the rotor, and a trailing edge at a blood downstream end of the rotor, the rotor comprising a radially projection-free periphery defined by a plurality of peripheral land surfaces and one or more flow channels extending radially inwardly from the periphery separating the peripheral land surfaces, the one or more flow channels extending from the leading edge to the trailing edge, the rotor further having a hydrodynamic bearing surface configured to enable the rotor to rotate freely suspended within the housing, the rotor including a plurality of magnetic poles; and a stator including an electrically activated coil configured to magnetically interact with the magnetic poles to cause the rotor to rotate. - View Dependent Claims (17, 18, 19, 20)
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Specification