Single-stage axial flow blood pump
First Claim
1. An intravascular blood pump, comprising:
- (a) a substantially cylindrical stator; and
(b) a rotor having a hub and cooperating with said stator to pump blood axially through said pump, said stator and rotor defining an annular space therebetween;
(c) means including two rows of blades on said rotor, for maintaining a radially uniform forward velocity of said blood in said annular space at the trailing edge of said rotor blade means, one of said rows producing a mixed axial and centrifugal flow, and the other producing a substantially pure axial flow.
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Accused Products
Abstract
A miniature high-speed intravascular blood pump is formed as a single stage with two rows of rotor blades and a single row of stator blades within a tubular housing. The rotor'"'"'s first row produces a mixed centrifugal and axial flow, while the rotor'"'"'s second row produces a purely axial flow. The blades of the second row are shaped so as to produce a uniform blood flow along the trailing edges of the blades. For this purpose, the bases of the outer trailing edges of the second row blades have a negative propulsion angle. The pump has a purge-sealed hydrostatic bearing which is spring-loaded for minimum gap. The pump is driven by a cable encased in a dual-lumen, fluid-filled cable sheath formed of a coextrusion of a soft, blood-compatible outer layer and a stiff, abrasion-resistant inner layer. The cable sheath serves both as a purge fluid supply for the bearing, and as a means for flushing abraded debris away from the pump.
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Citations
15 Claims
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1. An intravascular blood pump, comprising:
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(a) a substantially cylindrical stator; and (b) a rotor having a hub and cooperating with said stator to pump blood axially through said pump, said stator and rotor defining an annular space therebetween; (c) means including two rows of blades on said rotor, for maintaining a radially uniform forward velocity of said blood in said annular space at the trailing edge of said rotor blade means, one of said rows producing a mixed axial and centrifugal flow, and the other producing a substantially pure axial flow. - View Dependent Claims (2, 3, 4, 5)
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6. An intravascular blood pump comprising:
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(a) a substantially cylindrical stator; and (b) a rotor cooperating with said stator to pump blood axially through said pump; (c) said stator and rotor forming a single stage pump; (d) said rotor having two rows of blades, one of said rows producing a mixed axial and centrifugal flow, and the other producing a substantially purely axial flow; (e) cable means operatively connected to said rotor for driving the same; and (f) a cable sheath secured to said pump in fluid-tight relationship, said cable means being disposed longitudinally within said cable sheath; (g) said cable sheath including a pair of substantially parallel lumens. - View Dependent Claims (7, 8, 9)
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10. An intravascular blood pump, comprising:
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(a) a substantially cylindrical stator; and (b) a rotor cooperating with said stator to pump blood axially through said pump; (c) said stator and rotor forming a single stage pump; (d) said rotor having two rows of blades, one of said rows producing a mixed axial and centrifugal flow, and the other producing a substantially purely axial flow; (e) a purge-sealed hydrostatic bearing between said rotor and said stator disposed substantially transversely to the axis of said pump, and (f) resilient means for biasing said rotor against said stator at said bearing. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification