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Blood pump with frusto-conical bearing structure

  • US 20070004959A1
  • Filed: 05/13/2004
  • Published: 01/04/2007
  • Est. Priority Date: 05/13/2003
  • Status: Abandoned Application
First Claim
Patent Images

1. A blood pump comprising:

  • a stationary housing structure;

    a rotative impeller mounted within the stationary housing structure and defining with the stationary housing structure passages through which blood pumped by the rotative impeller flows through the pump;

    an inflow bearing comprising an inflow frusto-conical face of the rotative impeller and an inflow frusto-conical bushing of the stationary housing structure having an inner face;

    an outflow bearing comprising an outflow frusto-conical face of the rotative impeller and an outflow frusto-conical bushing of the stationary housing structure having an inner face;

    wherein the inner face of both the inflow and outflow frusto-conical bushings (a) comprises at least three axial grooves evenly spread out around a longitudinal axis of the blood pump, and (b) successively defines a taper and a land in the direction of rotation of the rotative impeller between each pair of successive grooves, the taper having a diameter that gradually decreases in the direction of rotation of the rotative impeller and the land having a generally constant diameter to form a seat for the frusto-conical face of the rotative impeller.

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