Apparatus and method for determining oxygen saturation levels with increased accuracy
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United States of America Patent
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Nov 18, 1986
Grant Date -
N/A
app pub date -
Feb 16, 1983
filing date -
Feb 16, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A catheter oximeter includes a fiber optic catheter for supplying radiation to blood under test at a plurality of wavelengths and detecting the intensities of the radiation back-scattered from the blood at each of the wavelengths. The oxygen saturation level of the blood is then computed by deriving it with a formula which uses the ratio of one pair of intensity signals when the oxygen saturation level is relatively low and with a formula which uses the ratio of another pair of intensity signals when the oxygen saturation level relatively is high.
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