Implantable medical device having an accelerometer
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United States of America Patent
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Mar 28, 2000
Grant Date -
N/A
app pub date -
Jun 24, 1999
filing date -
Sep 30, 1996
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An implantable medical device has a housing containing an accelerometer which detects vibrations of the housing. The accelerometer generates a vibration signal in response to the detected vibrations, which is supplied to a signal processing unit. The signal processing unit generates, for each of a number of predetermined frequency ranges, a parameter value indicative of a defined attribute of the vibration signal. The signal processing unit forms a ratio between any two of these parameter values, and emits at least one status value dependent on this ratio. The status value is uniquely indicative of a predetermined type or level of cardiac activity, and the status values can be used as a control signal for controlling therapy, such as cardiac stimulation, administered by the implantable medical device.
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