Axial flow pump with multi-grooved rotor

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/00 (2006.01)

Patent

CA 2624704

An axial-flow blood pump for pumping blood includes a substantially cylindrical outer enclosure. A tubular housing concentric with and located within the outer enclosure has at one end an inlet and at an opposite end an outlet. A motor stator is concentric with and located between the outer enclosure and the tubular housing. An impeller is concentric with and located within the tubular housing. The impeller is suspended in operation by a combination of passive magnetic forces between magnets within the impeller or magnetized regions of the impeller and the motor stator and hydrodynamic thrust forces generated as blood flows between the tubular housing and a plurality of hydrodynamic thrust bearing surfaces located on the impeller. A volute may be in fluid-tight connection with the outlet of the tubular housing for receiving blood in the axial direction and directing blood in a direction normal to the axial direction. The volute has a flow-improving member extending axially from the volute and into and coaxially with the tubular housing.

L~invention a pour objet une pompe axiale pour le pompage du sang comprenant une enceinte extérieure sensiblement cylindrique. Un boîtier tubulaire logé dans l~enceinte extérieure à laquelle il est concentrique présente un orifice d~admission à une extrémité et un orifice de refoulement à une autre extrémité opposée. Un stator moteur est logé entre l~enceinte extérieure et le boîtier tubulaire auxquels il est concentrique. Une roue est logée à l~intérieur du boîtier tubulaire auquel elle est concentrique. Pendant l~utilisation de la pompe, la roue est suspendue par la combinaison de champs magnétiques passifs entre des aimants à l~intérieur de la roue ou des zones aimantées de la roue et du stator moteur, tandis que des forces de poussée hydrodynamiques sont produites lorsque le sang s~écoule entre le boîtier tubulaire et une pluralité de surfaces de butée hydrodynamique sur la roue. Une volute peut être raccordée de manière étanche à l~orifice de refoulement du boîtier tubulaire afin de recevoir le sang dans la direction axiale et de le diriger dans une direction axiale normale. La volute possède un élément d~amélioration du débit qui s~étend axialement vers le et coaxialement au boîtier tubulaire.

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