Apparatus for determining the actual status of a piezoelectric sensor in a medical implant
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United States of America Patent
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Dec 7, 2004
Grant Date -
N/A
app pub date -
Oct 15, 2001
filing date -
Sep 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an apparatus for determining the actual status of a piezoelectric sensor in a medical implant, electrical charges generated in the sensor, in response to changes in acceleration and/or gravitational force or other loads acting on the sensor, are continuously detected and the charges are then removed from the sensor, thereby maintaining the voltage across the sensor at a substantial constant zero level. The detected charges, both negative and positive, are integrated, thereby providing a resulting integrated signal representing the actual status of the sensor. The integrated signal is then evaluated for determining the physical activity and/or the posture of a patient in whom the medical implant is implanted.
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