Apparatus for the detection of motion transients
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United States of America Patent
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Jul 13, 1993
Grant Date -
N/A
app pub date -
Mar 11, 1991
filing date -
Mar 11, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for detecting movement in patients coupled to pulse oximeters and a method for using the signal generated by the apparatus to filter out the effects of motion from the test results generated by the pulse oximeter are disclosed. In a preferred embodiment, a piezoelectric film located in close proximity to the pulse oximeter's sensor provides a voltage signal whenever movement occurs near the sensor. This voltage signal is processed and the resulting signal is used to correct the oximeter's measurements. In addition to piezoelectric film, accelerometers and strain gauges are also usable to provide a signal indicative of motion.
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