Modified Pulse Oximetry Technique For Measurement Of Oxygen Saturation In Arterial And Venous Blood
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United States of America Patent
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Issued Date -
Aug 28, 2008
app pub date -
Feb 22, 2007
filing date -
Feb 22, 2007
priority date (Note) -
Abandoned
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Abstract
A method for the measurement of oxygen saturation in arterial blood SaO.sub.2 by means of pulse oximetry without calibration is described. Photoplethysmography (PPG) is measured in three wavelengths in the infrared and for each PPG curve the relative change in light transmission is obtained. Two equations, each relating SaO.sub.2 to the ratio of the relative changes in light transmission for two wavelengths, using the values of the extinction coefficients of oxygenated and deoxygenated hemoglobin for the three wavelengths, enable the determination of SaO.sub.2, assuming linear dependence of the optical path-length on the wavelength, for the three wavelengths in the infrared. Similar technique for the determination of oxygen saturation in venous blood from changes in light transmission due to changes in venous blood volume is suggested
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