Axial flow pump with multi-grooved rotor
First Claim
1. A blood pump comprising:
- a housing defining a pump chamber lumen;
a rotor within said lumen, the rotor rotatable on a rotation axis concentric with the lumen and having;
an outer periphery;
a blood upstream end;
a blood downstream end opposite the blood upstream end;
a plurality of magnetic drive poles by which the rotor is configured to rotate to direct blood flow axially within the lumen;
at least one of a magnetic bearing and a hydrodynamic bearing surface configured to enable the rotor to rotate in a freely suspended configuration within the lumen;
a tapered axial extension at the blood downstream end, the tapered axial extension configured to enhance downstream blood flow characteristics in an axial direction when the rotor is rotating; and
a plurality of grooves disposed in the axial direction, the plurality of grooves defining a plurality of peripheral land surfaces and at least one flow channel within the respective plurality of grooves, the plurality of peripheral land surfaces being discrete and radially facing and including an interior base width and a radially facing surface width, the interior base width being narrower than the radially facing surface width, and including the at least one of the magnetic bearing and the hydrodynamic bearing surface coupled thereto, and the at least one flow channel extending from a location proximate the blood upstream end to a location proximate the blood downstream end and including;
a curved shape;
a substantially axially extending outlet channel proximate the blood downstream end configured to drive blood in an axial direction as the rotor is rotated; and
a width being at least one of substantially equal to and less than a collective total width of the plurality of peripheral land surfaces at the outer periphery of the rotor; and
a stator positioned exterior to the lumen, the stator configured to be energized and magnetically coupled with the plurality of magnetic drive poles of the rotor to cause the rotor to rotate in the lumen.
2 Assignments
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.
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Citations
18 Claims
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1. A blood pump comprising:
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a housing defining a pump chamber lumen; a rotor within said lumen, the rotor rotatable on a rotation axis concentric with the lumen and having; an outer periphery; a blood upstream end; a blood downstream end opposite the blood upstream end; a plurality of magnetic drive poles by which the rotor is configured to rotate to direct blood flow axially within the lumen; at least one of a magnetic bearing and a hydrodynamic bearing surface configured to enable the rotor to rotate in a freely suspended configuration within the lumen; a tapered axial extension at the blood downstream end, the tapered axial extension configured to enhance downstream blood flow characteristics in an axial direction when the rotor is rotating; and a plurality of grooves disposed in the axial direction, the plurality of grooves defining a plurality of peripheral land surfaces and at least one flow channel within the respective plurality of grooves, the plurality of peripheral land surfaces being discrete and radially facing and including an interior base width and a radially facing surface width, the interior base width being narrower than the radially facing surface width, and including the at least one of the magnetic bearing and the hydrodynamic bearing surface coupled thereto, and the at least one flow channel extending from a location proximate the blood upstream end to a location proximate the blood downstream end and including; a curved shape; a substantially axially extending outlet channel proximate the blood downstream end configured to drive blood in an axial direction as the rotor is rotated; and a width being at least one of substantially equal to and less than a collective total width of the plurality of peripheral land surfaces at the outer periphery of the rotor; and a stator positioned exterior to the lumen, the stator configured to be energized and magnetically coupled with the plurality of magnetic drive poles of the rotor to cause the rotor to rotate in the lumen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A blood pump comprising:
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a housing defining a pump chamber lumen; a rotor within the lumen, the rotor configured to be rotatable on a rotation axis concentric with the lumen and configured direct blood flow axially within the lumen, the rotor having; a blood upstream end; a blood downstream end opposite the blood upstream end; a plurality of magnetic drive poles by which the rotor is configured to rotate; a magnetic bearing surface configured to enable the rotor to rotate in a freely suspended configuration within the lumen; a tapered axial extension at the blood downstream end, the tapered axial extension configured to enhance downstream blood flow characteristics in an axial direction when the rotor is rotating; and a plurality of grooves disposed in the axial direction, the plurality of grooves defining a plurality of peripheral land surfaces and at least one flow channel within the respective plurality of grooves, the plurality of peripheral land surfaces being discrete and radially facing and including an interior base width and a radially facing surface width, the interior base width being narrower than the radially facing surface width, and including the at least one of the magnetic bearing and the hydrodynamic bearing surface coupled thereto, and the at least one flow channel extending from a location proximate the blood upstream end to a location proximate the blood downstream end and including; a curved shape; a substantially axially extending outlet channel proximate the blood downstream end configured to drive blood in an axial direction as the rotor is rotated; and being at least one of substantially equal to and less than a collective total width of the plurality of peripheral land surfaces at the outer periphery of the rotor; and a stator positioned exterior to the lumen, the stator configured to be energized and magnetically coupled with the plurality of magnetic drive poles of the rotor to cause the rotor to rotate in the lumen. - View Dependent Claims (16, 17, 18)
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Specification