Pulse amplitude indexing method and apparatus
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United States of America Patent
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Feb 27, 2007
Grant Date -
N/A
app pub date -
Nov 8, 2005
filing date -
Nov 8, 2005
priority date (Note) -
Expired
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Abstract
The invention is method and apparatus for determining a physiological characteristic by detecting the intensity of light following tissue absorption at two wavelengths, estimating the pulse amplitude and indexing a calculated physiological characteristic to the estimated pulse amplitude. In one embodiment, the ratio of logarithms of absorbance signal amplitude is indexed to the pulse amplitude to improve the accuracy of arterial oxygen saturation as determined by a pulse oximeter.
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