Method and apparatus for noninvasively monitoring hemoglobin concentration and oxygen saturation
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jan 9, 2003
app pub date -
Apr 19, 2002
filing date -
Apr 19, 2001
priority date (Note) -
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Abstract
A method and apparatus for noninvasively monitoring hemoglobin concentration and oxygen saturation, wherein the method includes selecting at least two wavelengths from a region of wavelengths in which an extinction coefficient for water is smaller that for hemoglobin, the at least two wavelengths including at least two isobestic wavelengths; sequentially radiating incident light beams having the selected wavelengths onto a predetermined site of a body which includes a blood vessel; receiving, at another site of the body, light beams sequentially transmitted through the predetermined site and converting the received light beams into electrical signals; calculating the light attenuation variation caused by pulses of blood for the respective wavelengths from the electrical signals; obtaining at least one ratio of the light attenuation variation between the selected wavelengths; and calculating the hemoglobin concentration C.sub.Hb in blood using the calculated at least one ratio of the light attenuation variation between the wavelengths.
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