Implantable stimulator with battery status measurement
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United States of America Patent
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Nov 14, 2000
Grant Date -
N/A
app pub date -
Jul 17, 1998
filing date -
Jul 17, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided an implantable device system such as a battery-powered pacemaker system, with an improved capability of measuring battery internal impedance, thereby providing the means to determine anticipated device End of Life. Within one pacemaker cycle following a sensed beat or a delivered stimulus, and before delivery of a next stimulus, three battery measurements are taken at equally spaced time intervals. Due to the RC nature of the battery internal impedance, the first two battery voltage measurements can be used to calculate what the voltage would be at the third time, assuming no change in current load. At the third time, a predetermined incremental current load is added, and the battery voltage at the time of the added current load is measured. The voltage differential between the calculated battery voltage and the measured battery voltage at the third time, together with the predetermined incremental current load, is used to calculate the battery impedance.
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