Heart stimulator determining cardiac output, by measuring the systolic pressure, for controlling the stimulation
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United States of America Patent
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Nov 6, 2001
Grant Date -
N/A
app pub date -
Jul 6, 2000
filing date -
Jan 9, 1998
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Abstract
A heart stimulator has a circuit for determining cardiac output and for producing a control signal corresponding to the determined cardiac output, and a controller for controlling cardiac stimulation dependent on the control signal. The circuit for determining cardiac output includes a pressure sensor which measures pressure in the right ventricle and which generates an electrical pressure signal corresponding to the measured pressure, and an integrator supplied with the pressure signal which integrates the pressure signal between a start time and stop time to produce an integration result corresponding to the cardiac output, which is used to form the control signal. The pressure signal is bandpass filtered during a systolic phase to identify opening of a valve at the right ventricle as the start time, and to identify closing of the valve as the stop time.
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