Sensor for right ventricular and thoracic volumes using the trailing edge value of a generated pulse
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United States of America Patent
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Dec 29, 1992
Grant Date -
N/A
app pub date -
Dec 7, 1990
filing date -
Dec 7, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor for developing a control signal to be injected into the mechanism of a cardiac diagnosis and therapy device is disclosed. An external or internal pulse generator associated with the sensor includes a pulse width timer and an oscillator circuit to deliver constant voltage pulses through a capacitor to a lead for delivery of therapy or diagnosis. Means for detecting the peak trailing edge voltage or the current are included as an indicator of the volume of blood present in the heart or the thoracic volume at the time of stimulation. The volume signal is then directed to implantable or external devices by a control signal output to be used in the circuit of the other device.
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