Impeller suspension mechanism for heart pump
First Claim
1. A centrifugal blood pump, comprising:
- a housing that defines an inlet passage, a chamber, and an outlet passage;
an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage, the impeller comprising an inner portion and an outer portion;
a plurality of impeller magnets embedded in the impeller such that the impeller and the plurality of impeller magnets rotate together within the chamber, the plurality of impeller magnets comprising an inner impeller magnet and an outer impeller magnet relative to a central axis of the impeller;
a motor to control movement of the impeller in the chamber, the motor being positioned adjacent the chamber and separated from the chamber by a partition member;
an inner annular magnetic member embedded in a wall of the housing opposite the partition member; and
an outer annular magnetic member embedded in the wall of the housing opposite the partition member, wherein a first net magnetic force between the inner annular magnetic member and the inner impeller magnet exhibits greater attraction than a second net magnetic force between the outer annular member and the outer impeller magnet.
3 Assignments
0 Petitions
Accused Products
Abstract
A centrifugal blood pump includes a housing that defines an inlet passage, a chamber, and an outlet passage. The pump includes an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage and magnetic members embedded in the impeller such that the impeller and the magnetic members rotate together within the chamber. The pump includes a motor to control movement of the impeller in the chamber. The motor is adjacent the chamber and separated from the chamber by a partition member. The pump includes an inner annular magnetic member and an outer annular magnetic member embedded in a side of the housing opposite the partition member. A first net magnetic force between the inner annular magnetic member and the magnetic members exhibits greater attraction than a second net magnetic force between the outer annular member and the magnetic members.
439 Citations
20 Claims
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1. A centrifugal blood pump, comprising:
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a housing that defines an inlet passage, a chamber, and an outlet passage; an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage, the impeller comprising an inner portion and an outer portion; a plurality of impeller magnets embedded in the impeller such that the impeller and the plurality of impeller magnets rotate together within the chamber, the plurality of impeller magnets comprising an inner impeller magnet and an outer impeller magnet relative to a central axis of the impeller; a motor to control movement of the impeller in the chamber, the motor being positioned adjacent the chamber and separated from the chamber by a partition member; an inner annular magnetic member embedded in a wall of the housing opposite the partition member; and an outer annular magnetic member embedded in the wall of the housing opposite the partition member, wherein a first net magnetic force between the inner annular magnetic member and the inner impeller magnet exhibits greater attraction than a second net magnetic force between the outer annular member and the outer impeller magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A centrifugal blood pump, comprising:
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a housing that defines an inlet passage, a chamber, and an outlet passage; an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage; a plurality of impeller magnets embedded in the impeller such that the impeller and the plurality of impeller magnets rotate together within the chamber; a motor to control movement of the impeller in the chamber, the motor being positioned adjacent the chamber and separated from the chamber by a partition member; and at least one annular magnetic member embedded in a wall of the housing opposite the partition member, wherein a first net magnetic force between the at least one annular magnetic member and a proximal portion the plurality of impeller magnets exhibits greater attraction than a second net magnetic force between the at least one annular magnetic member and a distal portion of the plurality of impeller magnets, the proximal portion and the distal portion being relative to a central axis of the impeller. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A centrifugal blood pump, comprising:
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a housing that defines an inlet passage, a chamber, and an outlet passage; an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage, the impeller comprising an inner portion and an outer portion relative to a central axis of the impeller; at least one impeller magnet embedded in the impeller such that the impeller and at least one magnetic member rotate together within the chamber; a motor to control movement of the impeller in the chamber, the motor being positioned adjacent the chamber and separated from the chamber by a partition member; and at least one annular magnetic member embedded in a side of the housing opposite the partition member, wherein a first force exhibited on the inner portion has a greater attraction than a second force exhibited on the outer portion of the impeller, wherein the first force and the second force each result from interactions between the at least one impeller magnet and the at least one annular magnetic member. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification