MAGNETICALLY SUSPENDED PUMP
First Claim
1. A blood pump comprising:
- a housing having an axis;
first and second stator permanent magnets fixed relative to the housing at axially-spaced locations;
a rotor having an axis disposed within the pump housing including a first rotor permanent magnet associated with and magnetically interacting with the first stator permanent magnet and a second rotor permanent magnet associated with and magnetically interacting with the second stator permanent magnet, so that the interacting magnets urge the rotor into an alignment coaxial with the housing,wherein the first stator permanent magnet exerts a first axial force on the first rotor permanent magnet in a first axial direction and the second stator permanent magnet exerts a second axial force on the second rotor permanent magnet in a second axial direction opposite to the first axial direction.
1 Assignment
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Accused Products
Abstract
An axial now blood pump includes a pump housing and first and second stator permanent magnets fixed to the pump housing. A rotor assembly is disposed within the pump housing and includes first and second rotor permanent magnets. The first fixed permanent magnet may be axially offset from the first rotor permanent magnet and the second fixed permanent magnet may be axially offset from the second rotor permanent magnet. The permanent magnets act as passive radial bearings with maintain the rotor coaxial with the housing, and also exert axial forces on the first and second rotor permanent magnets to urge the rotor towards an equilibrium axial position relative to the housing. The rotor may be suspended and positioned within the housing solely by operation of the permanent magnets.
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Citations
14 Claims
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1. A blood pump comprising:
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a housing having an axis; first and second stator permanent magnets fixed relative to the housing at axially-spaced locations; a rotor having an axis disposed within the pump housing including a first rotor permanent magnet associated with and magnetically interacting with the first stator permanent magnet and a second rotor permanent magnet associated with and magnetically interacting with the second stator permanent magnet, so that the interacting magnets urge the rotor into an alignment coaxial with the housing, wherein the first stator permanent magnet exerts a first axial force on the first rotor permanent magnet in a first axial direction and the second stator permanent magnet exerts a second axial force on the second rotor permanent magnet in a second axial direction opposite to the first axial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification