Blood pump
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United States of America Patent
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-
Aug 27, 2002
Grant Date -
N/A
app pub date -
Mar 23, 2000
filing date -
Mar 23, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A blood pump includes a centrifugal impeller for pumping blood and a volute member enclosing the centrifugal impeller within a volute chamber. A magnetic drive causes magnets embedded on the impeller to rotate the impeller. The centrifugal impeller and volute chamber are configured to provide a specific speed ratio (Ns) of between approximately 500 and 600 wherein Ns equals NQ0.5/H0.75, where: N=impeller rotative speed in revolutions per minute (RPM); Q=gallons per minute (GPM) of flow; and H=head rise in feet of blood. The impeller includes blades having a radial length to an axial width ratio that provides the specific speed. The configuration of the volute and impeller combination provides desired blood flow and pressure rise at low specific speed.
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