Ventricular assist system secondary impeller

Details Ventricular assist system secondary impeller Ventricular assist system secondary impeller

A - Human Necessities

61

M

A61M 1/10 (2006.01) F04D 13/06 (2006.01) F04D 29/04 (2006.01) F04D 29/22 (2006.01)

Patent

CA 2404623

In a centrifugal flow blood pump, usable in left ventricular assist applications, blood is pumped from an inlet (16) to an outlet (22) by a primary impeller (18). A portion of the blood that enters the pump follows a secondary channel (24) where a secondary impeller (70) routes the blood to lubricate a bearing between an impeller assembly (14) and a post formed by a component of the pump housing. The unique shape of the secondary impeller (70) prevents blood stagnation and provides for a well-washed fluid bearing.

L'invention concerne une pompe à sang à flux centrifuge pouvant être utilisée dans des applications d'assistance ventriculaire gauche, le sang étant pompé d'une entrée (16) vers une sortie (22) au moyen d'une roue primaire (18). Une partie du sang entrant dans la pompe suit un canal secondaire (24) dans lequel une roue secondaire (70) refoule le sang afin de lubrifier un palier situé entre un ensemble roue (14) et un montant formé par un composant du carter de pompe. La forme particulière de la roue secondaire (70) permet d'éviter la stagnation du sang et une bonne lubrification du palier fluide.

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