Impeller for a rotary ventricular assist device
First Claim
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1. A magnetically driven rotary ventricular assist device implantable in a patient and configured to pump blood of the patient, said device comprising:
- a rotatable body formed entirely of heat treated biocompatible magnetizable platinum and cobalt alloy, said rotatable body having a shape by which each of a plurality of blood flow channels formed therein is configured to direct blood traversing a channel away from said body when said body is rotating within the assist device, selected portions of said body of magnetizable alloy being subjected to magnetization establishing magnetic bearings for support of said body when said body is rotating within the ventricular assist device and for inducing north magnetic poles and south magnetic poles for effecting one or more of a magnetic drive mechanism and an axial or radial orientation of said body within the assist device while rotating.
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Abstract
An impeller for a blood pump such as a magnetically driven, rotary ventricular assist device for pumping blood of a patient, the impeller being substantially entirely made of an alloy which consists essentially of about 70-80 weight percent of platinum and 20-30 weight percent of cobalt.
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Citations
13 Claims
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1. A magnetically driven rotary ventricular assist device implantable in a patient and configured to pump blood of the patient, said device comprising:
a rotatable body formed entirely of heat treated biocompatible magnetizable platinum and cobalt alloy, said rotatable body having a shape by which each of a plurality of blood flow channels formed therein is configured to direct blood traversing a channel away from said body when said body is rotating within the assist device, selected portions of said body of magnetizable alloy being subjected to magnetization establishing magnetic bearings for support of said body when said body is rotating within the ventricular assist device and for inducing north magnetic poles and south magnetic poles for effecting one or more of a magnetic drive mechanism and an axial or radial orientation of said body within the assist device while rotating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A magnetically driven, rotary ventricular assist device, said device implantable in a patient and configured to pump blood of the patient, said device comprising:
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a body formed entirely of biocompatible magnetizable alloy consisting essentially of about 70-80 weight percent of platinum and about 20-30 weight percent of cobalt, to enable strong electromagnetic coupling, said body of biocompatible magnetizable alloy being shaped to define a blood pumping impeller having a plurality of blood flow channels defining land areas therebetween, selected portions f said body of magnetizable alloy being subjected to magnetization whereby said blood pumping impeller comprises a plurality of north poles and a plurality of south poles, said magnetization arranging at least one of said north poles or at least one of said south poles on each of said land areas. - View Dependent Claims (10, 11, 12, 13)
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Specification