System using green light to determine parmeters of a cardiovascular system
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United States of America Patent
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Dec 11, 2001
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N/A
app pub date -
Nov 3, 1998
filing date -
Nov 18, 1996
priority date (Note) -
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Abstract
A reflectance pulse oximeter that determines oxygen saturation of hemoglobin using two sources of electromagnetic radiation in the green optical region, which provides the maximum reflectance pulsation spectrum. The use of green light allows placement of an oximetry probe at central body sites (e.g., wrist, thigh, abdomen, forehead, scalp, and back). Preferably, the two green light sources alternately emit light at 560 nm and 577 nm, respectively, which gives the biggest difference in hemoglobin extinction coefficients between deoxyhemoglobin, RHb, and oxyhemoglobin, HbO.sub.2.
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