Ventricular assist device comprising an enclosed-impeller...

A - Human Necessities – 61 – M

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A61M 1/10 (2006.01) F04D 13/06 (2006.01) A61M 1/12 (2006.01)

Patent

CA 2292432

The axial flow blood pump comprises a stationary housing structure, and an impeller rotatably mounted in the stationary housing structure about an axis of rotation to produce a flow of blood along this axis of rotation. The impeller includes a generally cylindrical shroud centered on the axis of rotation, a plurality of impeller blades extending inwardly from the inner surface of the shroud to intersect with each other at the axis of rotation, and a central hub centered on the axis of rotation and formed by the intersection of the impeller blades. The axial flow blood pump further comprises an electric motor drive incorporated in both the generally cylindrical shroud and the stationary housing structure. More specifically, the electric motor drive comprises a set of windings enclosed in the stationary housing structure, and a set of elongated axial permanent magnets embedded in the shroud. The axial flow blood pump can be used in an implantable ventricular assist device. The enclosed-impeller axial flow geometry of the pump, as well as the small diameter of the central hub substantially increase the volume of blood the pump is capable of containing and therefore of pumping.

L'invention concerne une pompe à sang axiale constituée d'une structure corps fixe et d'un rotor monté rotatif dans ladite structure autour d'un axe de rotation, de façon à produire un flux de sang suivant ledit axe. Le rotor comprend une chemise généralement cylindrique, centrée sur l'axe de rotation; une pluralité d'aubes de rotor, allongées vers l'intérieur depuis la surface interne de la chemise de façon à s'entrecouper au niveau de l'axe de rotation; et un moyeu central, centré sur l'axe de rotation et formé par l'intersection des aubes. La pompe comporte également un moteur électrique disposé à la fois dans la chemise et dans la structure corps. Plus spécifiquement, le moteur électrique comprend une série de bobinages, enfermés dans la structure corps fixe, et une série d'aimants permanents allongés axialement, incorporés à la chemise. La pompe peut être utilisée dans un appareil d'assistance ventriculaire implantable. La géométrie axiale à rotor fermé de la pompe, associée au petit diamètre du moyeu central, accroît le volume de sang que la pompe est capable de contenir et donc de pomper.

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