Method and apparatus for accurately measuring the saturated oxygen in arterial blood by substantially eliminating noise from the measurement signal
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United States of America Patent
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Nov 30, 1999
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N/A
app pub date -
Nov 26, 1997
filing date -
Feb 14, 1994
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Abstract
A pulse oximeter includes a light-emitting device for repeating red light emission, infrared light emission, and no light emission with respect to an object to be measured every data sampling cycle in a measurement of a saturated oxygen in arterial blood, a light-receiving device for outputting a light-receiving signal obtained by receiving transmitted light or reflected light from the object to be measured; a noise level detecting device for detecting from the light-receiving signal a noise signal level at the time of no light emission in the light-receiving device, and a light-receiving signal generating device for obtaining a light-receiving signal of a level corresponding only to the red light emission and the infrared light emission by subtracting the noise signal level from each of light-receiving signal levels of the red light emission and the infrared light emission.
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