Implantable Medical Device Orientation Detection Utilizing an External Magnet and a 3D Accelerometer Sensor
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United States of America Patent
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Issued Date -
Jan 14, 2010
app pub date -
Sep 30, 2008
filing date -
Jul 8, 2008
priority date (Note) -
Abandoned
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Abstract
A method and device for detecting the implanted orientation of an implantable medical device (IMD) in a patient. IMD includes an accelerometer for measuring acceleration signals in three orthogonal directional axes. A y-axis orientation of IMD is determined from the measured accelerometer signals using a gravitational force analysis. IMD includes a magnetic sensor that senses a varying magnetic field exerted on the magnetic sensor from an external magnet moved along a medial-lateral direction with respect to IMD. The z-axis orientation of IMD is determined from the location of the external magnet where the magnetic field exerted on the magnetic sensor is greatest. Based on a known relationship between the accelerometer and magnetic sensor, an orthogonal transformation calculation is performed on the y-axis and z-axis orientations to yield the x-axis orientation. The implanted orientation of IMD with respect to the patient is thus known and used to compensate accelerometer measurements.
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