Battery impedance measurement apparatus
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Nov 29, 1990
filing date -
Nov 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery impedance measurement apparatus for battery powered implantable medical apparatus in which current source means and reference impedance means are selectively connected across the battery after it has been isolated from the medical apparatus, and the resulting currents of interest are digitized to provide a factor directly related to the value of the internal impedance of the battery. The digitized value may be telemetered out of the implanted medical apparatus to enable critical decisions to be made based on the remaining life of the implanted battery. The same measurement apparatus can be used to form an accurate end-of-life signal.
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