Heart stimulator determining cardiac output, by measuring the systolic pressure, for controlling the stimulation
First Claim
1. A heart stimulator comprising:
- a circuit for determining cardiac output and for producing a control signal corresponding to said cardiac output;
a controller for controlling cardiac stimulation dependent on said control signal; and
said circuit including a pressure sensor adapted to sense pressure in a right ventricle and to generate an electrical pressure signal corresponding to the sensed pressure, an integrator supplied with said pressure signal which integrates said pressure signal between a start time and a stop time to produce an integration result, corresponding to said cardiac output, forming said control signal, and wherein said pressure signal is bandpass filtered during a systolic phase to identify opening of a valve at said right ventricle as said start time and closing of said valve as said stop time.
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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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Citations
12 Claims
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1. A heart stimulator comprising:
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a circuit for determining cardiac output and for producing a control signal corresponding to said cardiac output;
a controller for controlling cardiac stimulation dependent on said control signal; and
said circuit including a pressure sensor adapted to sense pressure in a right ventricle and to generate an electrical pressure signal corresponding to the sensed pressure, an integrator supplied with said pressure signal which integrates said pressure signal between a start time and a stop time to produce an integration result, corresponding to said cardiac output, forming said control signal, and wherein said pressure signal is bandpass filtered during a systolic phase to identify opening of a valve at said right ventricle as said start time and closing of said valve as said stop time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification