Axial flow pump with multi-grooved rotor
First Claim
1. An axial flow blood pump, comprising:
- a pump housing;
a rotor for pumping blood positioned in said housing, said rotor having an axis of rotation, a leading edge proximate an upstream end of said rotor, and a trailing edge proximate a downstream end of said rotor, and comprising peripheral land surfaces defined by one or more flow channels between the respective land surfaces, said one or more flow channels extending from said leading edge to said trailing edge, each said one or more flow channels being curved and having a substantially axially extending outlet channel proximate said trailing edge to drive blood in an axial direction as the rotor is rotated, wherein a collective width of said channels in a circumferential direction of said rotor at each of some axial positions on the radial periphery of the rotor being substantially equal to or less than the collective total width of said peripheral land surfaces in the circumferential direction at said axial positions; and
a motor including a plurality of magnetic poles carried by the rotor, and a stator including an electrically activated coil to magnetically interact with said magnetic poles to cause said rotor to rotate.
1 Assignment
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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.
138 Citations
20 Claims
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1. An axial flow blood pump, comprising:
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a pump housing; a rotor for pumping blood positioned in said housing, said rotor having an axis of rotation, a leading edge proximate an upstream end of said rotor, and a trailing edge proximate a downstream end of said rotor, and comprising peripheral land surfaces defined by one or more flow channels between the respective land surfaces, said one or more flow channels extending from said leading edge to said trailing edge, each said one or more flow channels being curved and having a substantially axially extending outlet channel proximate said trailing edge to drive blood in an axial direction as the rotor is rotated, wherein a collective width of said channels in a circumferential direction of said rotor at each of some axial positions on the radial periphery of the rotor being substantially equal to or less than the collective total width of said peripheral land surfaces in the circumferential direction at said axial positions; and a motor including a plurality of magnetic poles carried by the rotor, and a stator including an electrically activated coil to magnetically interact with said magnetic poles to cause said rotor to rotate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification