Orientation of patient's position sensor using external field
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United States of America Patent
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Sep 23, 2003
Grant Date -
Feb 27, 2003
app pub date -
Aug 24, 2001
filing date -
Aug 24, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An implantable cardiac stimulation device is equipped with an accelerometer-based sensor to sense a patient's movement and produce a vertical acceleration component indicative of a patient's acceleration in a vertical direction. A vertical velocity component is computed from the vertical acceleration component. The device may be further equipped with a magnetic field sensor to sense the earth's magnetic field as a way to obtain a true vertical orientation, against which the accelerometer-based sensor can be calibrated.
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