Apparatus and method using near infrared reflectometry to reduce the effect of positional changes during spinal cord stimulation
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United States of America Patent
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Sep 15, 2015
Grant Date -
Mar 13, 2014
app pub date -
Feb 28, 2013
filing date -
Oct 14, 2010
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Abstract
A positionally sensitive spinal cord stimulation apparatus and method using near-infrared (NIR) reflectometry are provided for automatic adjustments of spinal cord stimulation. The system comprises an electrode assembly with an integrated optical fiber sensor for sensing spinal cord position. The integrated optical fiber sensor, comprising a set of optical elements for emitting light from a set of IR emitters and for collecting reflected light into a set of IR photodetectors, determines a set of measured optical intensities. As the spinal cord changes position, the angles of incidence for light from the IR emitter and the measured optical intensities change. A ratio of measured optical intensities in combination with a total measured optical intensity is used to interpolate a set of electrode stimulation settings from a calibration table. Electrode pulse characteristics are adjusted in real time to minimize changes in stimulation perceived by the patient during motion.
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