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Method and apparatus for accurately measuring the saturated oxygen in arterial blood by substantially eliminating noise from the measurement signal

  • US 5,995,859 A
  • Filed: 11/26/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 02/14/1994
  • Status: Expired due to Term
First Claim
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1. A pulse oximeter comprising:

  • light-emitting means for repeating, successively, red light emission, infrared light emission, and no light emission, with respect to an object to be measured, in every data sampling cycle in measurement of a saturated oxygen in arterial blood;

    light-receiving means for outputting a light-receiving signal obtained by receiving transmitted light and reflected light reflected from the object to be measured;

    noise level detecting means for detecting, from the light-receiving signal, a noise signal level at the time of no light emission; and

    signal generating means for processing the light-receiving signal to obtain a measurement signal having a level corresponding only to the red light emission and the infrared light emission by subtracting the noise signal level from the light-receiving signal.

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