F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 17/03 (2006.01) A61M 1/10 (2006.01) F04D 7/04 (2006.01) F04D 13/06 (2006.01) F04D 29/04 (2006.01)
Patent
CA 2265612
An axial-flow blood pump (10) has a rotor (20) suspended in ball-and-cup bearings (38, 34) which are blood-cooled but not actively blood-lubricated. The ball-and-cup structures are made of highly heat- conductive material and are in heat-transferring contact with heat-conductive stator blades (30) that serve as heat sinks for the bearings. The ball-and-cup structures are radially much smaller than the stator blades. The ball-to-cup interface has so small a gap that the ball-to-cup structures present an essentially continuous surface to the blood flow.
L'invention porte sur une pompe à sang (10) à écoulement axial comportant un rotor (20) suspendu dans des paliers à bille et à rotule (38, 34) qui sont refroidis par le sang, mais non lubrifiés activement par le sang. Les structures à bille et à rotule sont fabriquées dans un matériau hautement thermoconducteur et sont en contact par transfert thermique avec des pales (30) de stator thermoconductrices qui servent de puits thermiques pour les paliers. Les structures à bille et à rotule sont radialement plus petites que les pales du stator. L'interface bille-rotule comporte un très léger vide qui fait que les structures à bille et à rotule présentent une surface essentiellement continue adaptée à l'écoulement sanguin.
Butler Kenneth C.
Le Blanc Pieter W. J. C.
Maher Timothy R.
Taylor Lynn P.
Nimbus Inc.
Sim & Mcburney
Thoratec Corporation
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