Rotary blood pump

G - Physics – 06 – Q

Patent

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G06Q 10/00 (2006.01)

Patent

CA 2647151

The present invention provides a rotary blood pump with both an attractive magnetic axial bearing and a hydrodynamic bearing. In one embodiment according to the present invention, a rotary pump includes an impeller assembly supported within a pump housing assembly by a magnetic axial bearing and a hydrodynamic bearing. The magnetic axial bearing includes at least two magnets oriented to attract each other. One magnet is positioned in the spindle of the pump housing while the other is disposed within the rotor assembly, proximate to the spindle. In this respect, the two magnets create an attractive axial force that at least partially maintains the relative axial position of the rotor assembly. The hydrodynamic bearing is formed between sloping surfaces that form tight clearances below the rotor assembly.

La présente invention concerne une pompe sanguine rotative avec à la fois un palier axial magnétique d'attraction et un palier hydrodynamique. Dans un mode de réalisation selon la présente invention, une pompe rotative comprend un ensemble rotor soutenu dans un ensemble carter de pompe par un palier axial magnétique et un palier hydrodynamique. Le palier axial magnétique comprend au moins deux aimants orientés pour s'attirer mutuellement. Un aimant est positionné dans l'axe du carter de pompe tandis que l'autre est disposé dans l'ensemble rotor, à proximité de l'axe. À cet égard, les deux aimants créent une force axiale d'attraction qui au moins partiellement maintient la position axiale relative de l'ensemble rotor. Le palier hydrodynamique est formé entre des surfaces obliques qui forment des espaces libres limités sous l'ensemble rotor.

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