Detection of parasitic signals during pulsoxymetric measurement
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United States of America Patent
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Jan 30, 2001
Grant Date -
N/A
app pub date -
Mar 25, 1999
filing date -
Apr 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the proposed method for detecting spurious signals caused by movements of the patient or his environment in the pulse oximetric measurement of the arterial oxygen saturation, the intensity of the light emerging from the test specimen is measured by two photodiodes (7, 8). The signals (S.sub.1, S.sub.2) generated at these photodiodes (7, 8) are normalized to equal levels of their DC components. Finally, to detect spurious signals caused by movements, the differences (.DELTA.S.sub.n) of these normalized signals (S.sub.1n, S.sub.2n) are formed.
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