Control circuit for an implantable heart-assist pump of the back-pressure balloon type
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United States of America Patent
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Apr 18, 2000
Grant Date -
N/A
app pub date -
Dec 11, 1998
filing date -
Feb 21, 1996
priority date (Note) -
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Abstract
The pump (10) has variable volume means (24) co-operating with a distinct volume (20) through which the blood flows for the purpose of varying said volume (20) through which the blood flows in cyclical and controlled manner. According to the invention, the control circuit for the pump comprises: means for sensing data representative of aortic pressure (P(t)); means for sensing data representative of venous oxygen concentration (PO.sub.2V); means for sensing data representative of aortic oxygen concentration (PO.sub.2A); means for sensing data representative of heartbeat frequency (F); and/or means for sensing data representative of the myocardial contractility (dP/dt). The circuit can control the rates (u(t), v(t)) at which said volume varies during the systolic and diastolic phases of the myocardium, and also the instants (t.sub.A ; t.sub.R) at which said variation of the volume starts during the systolic and diastolic phases.
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