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IMPELLER FOR AXIAL FLOW PUMP

  • US 20150051438A1
  • Filed: 08/14/2014
  • Published: 02/19/2015
  • Est. Priority Date: 08/14/2013
  • Status: Active Grant
First Claim
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1. A rotor for an axial flow blood pump, the rotor having an axis extending in upstream and downstream axial directions and a plurality of generally helical blades extending from an inflow end of the rotor to an outflow end of the rotor, the blades projecting outwardly away from the axis in a spanwise direction, the blades being coextensive in the axial directions and spaced apart from one another in a circumferential direction around the axis so as to define generally helical channels between adjacent ones of the blades, each said blade having a pressure surface facing in a forward circumferential direction, a suction surface facing in a rearward circumferential direction and a tip surface extending between the pressure and suction surfaces of the blade, each said channel being bounded by the pressure side of one of said blades and the suction side of a next adjacent one of said blades, the tip surfaces of the blades defining hydrodynamic bearing regions capable of suspending the rotor, wherein the rotor is adapted to provide at least one of:

  • (a) at least 5 liters of blood flow at 75 mm Hg pressure head with a V150 less than 25 mm3; and

    (b) a specific blood flow rate of at least 50,000 mm/min at 75 mm Hg pressure head and a rotational speed of 15,000 revolutions per minute; and

    (c) an average outflow angle less than 30 degrees.

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