Apparatus and method for reducing heart pump backflow
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United States of America Patent
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Issued Date -
Jan 30, 2003
app pub date -
Jun 5, 2002
filing date -
Jun 6, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An apparatus and method for reducing backflow in a heart pump device are disclosed. In one configuration, a ventricular assist device (VAD) has a pump connected to a ventricle of the heart by an inflow cannula and to a blood vessel by an outflow cannula. The VAD is designed in such a manner that the overall reactance of the VAD is comparatively high, thereby reducing the incidence of time-varied flows, such as backflow, through the VAD. Resistance of the VAD to steady state flow may simultaneously be maintained below a threshold level to provide low-power operation. The desired reactance and resistance properties of the VAD may be obtained by adjusting the reactance and resistance of one or both of the cannulae. The reactance of a cannula may be set at the desired level by tuning one or more geometric characteristics of the cannula, including the bore diameter, length, cross sectional bore shape, and compliance of the cannula.
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