Streamlined unobstructed one-pass axial-flow pump
First Claim
Patent Images
1. A blood pump, comprising:
- a stator having a cavity extending therethrough;
an impeller, rotatably disposed and magnetically suspended within the cavity of the stator, the impeller defining an axis of rotation, and the stator and impeller defining a fluid passage therebetween;
a plurality of magnetic bearings, including passive permanent magnet and active electromagnetic bearings, suspending the impeller within the cavity of the stator, and having impeller magnets on the impeller and stator magnets or coils/poles on the stator;
a motor including impeller magnets on the impeller and coils/poles associated with the stator; and
a single, annular blood flow path extending axially through the cavity between the impeller and the stator, and between the impeller magnets on the impeller and the stator magnets or the coils/poles on the stator.
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Accused Products
Abstract
A blood pump has an impeller rotatably disposed and magnetically suspended within a cavity of a stator by a plurality of magnetic bearings (passive permanent and active electromagnetic) having impeller magnets on the impeller and stator magnets or coils/poles on the stator. A motor includes impeller magnets on the impeller and coils/poles associated with the stator. A single, annular blood flow path extends axially through the cavity between the impeller and the stator, and between the impeller magnets on the impeller and the stator magnets or the coils/poles on the stator.
178 Citations
20 Claims
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1. A blood pump, comprising:
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a stator having a cavity extending therethrough;
an impeller, rotatably disposed and magnetically suspended within the cavity of the stator, the impeller defining an axis of rotation, and the stator and impeller defining a fluid passage therebetween;
a plurality of magnetic bearings, including passive permanent magnet and active electromagnetic bearings, suspending the impeller within the cavity of the stator, and having impeller magnets on the impeller and stator magnets or coils/poles on the stator;
a motor including impeller magnets on the impeller and coils/poles associated with the stator; and
a single, annular blood flow path extending axially through the cavity between the impeller and the stator, and between the impeller magnets on the impeller and the stator magnets or the coils/poles on the stator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A blood pump, comprising:
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a) a stator having a cavity extending therethrough;
b) an impeller, rotatably disposed and magnetically suspended within the cavity of the stator, the impeller defining an axis of rotation, and the stator and impeller defining a fluid passage therebetween;
c) a radial, active, electromagnet bearing, disposed nearer an inlet to the fluid passage, to radially support the impeller in the cavity, including;
i) an impeller magnet, disposed nearer a leading end on the impeller; and
ii) a plurality of poles and coils, disposed on the stator radially across the fluid passage from the impeller magnet;
d) an axial, passive, permanent magnet bearing, disposed intermediate along the fluid passage, to axially support the impeller in the cavity, including;
i) a plurality of impeller magnets, disposed intermediate along the impeller, the impeller magnets having axially oriented polls with sequentially altering polarity; and
ii) a plurality of stator magnets, disposed on the stator radially across the fluid passage from the impeller magnets, the stator magnets having axially oriented polls with sequentially alternating polarity; and
iii) the impeller and stator magnets being radially aligned across the fluid passage from one another with the polls of the impeller and stator magnets oppositely aligned with opposite polls radially aligned across the fluid passage;
e) a radial, passive, permanent magnet bearing, disposed nearer an outlet of the fluid passage, to radially support the impeller in the cavity, including;
i) a plurality of impeller magnets, disposed near a trailing end of the impeller, the impeller magnets having axially oriented polls with sequentially alternating polarity; and
ii) a plurality of stator magnets, disposed on the stator radially across the fluid passage from the impeller magnets, the stator magnets having axially oriented polls with sequentially alternating polarity; and
iii) the impeller and stator magnets being radially aligned across the fluid passage from one another with the polls of the impeller and stator magnets commonly aligned with common polls radially aligned across the fluid passage;
f) a motor including impeller magnets on the impeller and coils/poles associated with the stator; and
g) a single, annular blood flow path extending axially through the cavity between the impeller and the stator, and between the impeller magnets on the impeller and the stator magnets or the coils/poles on the stator.
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Specification