Heart stimulator with an evoked response detector
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United States of America Patent
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Apr 18, 2000
Grant Date -
N/A
app pub date -
Feb 12, 1999
filing date -
Feb 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heart stimulator has a pulse generator for producing stimulation pulses of varying amplitudes and varying durations for stimulating the heart of a patient, and an evoked response detector. The evoked response detector includes measuring and memory circuitry for measuring the charge delivered by a stimulation pulse. The measuring and memory circuitry determine and store, as a reference voltage, a charged voltage value related to the measured charge. Monitoring circuitry monitors the combined polarization and possible evoked response signal picked up from the patient's heart after the delivery of a stimulation pulse and derive a corresponding monitoring voltage value therefrom. A comparator compares the monitoring voltage value to the charged voltage value for determining, from the result of the comparison, the presence or absence of an evoked response.
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