Patent ID: 6439845
Filing Date: 2002-08-27
Classification: A61M,F04D,Y10S

Abstract:
A blood pump comprising:a centrifugal impeller for pumping blood; and a volute member enclosing the centrifugal impeller within a volute chamber; wherein the centrifugal impeller provides a specific speed ratio (Ns) of between approximately 500 and 600 via a plurality of impeller blades having a ratio Rb of approximately 6.75, wherein Rb=Il/Iw where Il is the radial length of the blades and Iw is the axial width of the blades, wherein Ns=NQ0.5H0.75whereN=impeller rotative speed in revolutions per minute (RPM) Q=gallons per minute (GPM) of flow, and H=head rise in feet of blood.