Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1997-11-26
1999-11-30
Cohen, Lee
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
600336, A61B 500
Patent
active
059958596
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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patent: 5253646 (1993-10-01), Delpy et al.
patent: 5282466 (1994-02-01), Duffy et al.
patent: 5632272 (1997-05-01), Diab et al.
Cohen Lee
Nihon Kohden Corporation
Yarnell Bryan K.
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