Pulse oximeter sensor with piece-wise function
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United States of America Patent
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Oct 5, 2004
Grant Date -
Mar 21, 2002
app pub date -
Apr 16, 2001
filing date -
Apr 17, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A memory in a sensor is used to store multiple coefficients for a physiological parameter. In one embodiment, not only are the sensor's specific calibration coefficients stored in a memory in the sensor for the formula to determine oxygen saturation, but multiple sets of coefficients are stored. The multiple sets apply to different ranges of saturation values to provide a better fit to occur by breaking the R to SpO2 relationship up into different pieces, each described by a different function. The different functions can also be according to different formulas for determining oxygen saturation.
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