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Green light pulse oximeter

  • US 5,830,137 A
  • Filed: 11/18/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 11/18/1996
  • Status: Expired due to Term
First Claim
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1. A pulse oximeter for determining the oxygen saturation of hemoglobin, comprising:

  • (a) a first emitter of green light for selectively illuminating a skin surface and a volume of intravascular blood therebeneath;

    the green light from said first emitter of green light having a first peak wavelength and a first wavelength band associated therewith;

    said first peak wavelength being within the range of about 500-600 nm;

    light at said first peak wavelength having absorption coefficients with respect to oxyhemoglobin and deoxyhemoglobin;

    the green light from said first emitter of green light interacting with oxyhemoglobin in the volume of intravascular blood, thereby generating a first optical signal, the first optical signal having an intensity;

    (b) a second emitter of green light for selectively illuminating the skin surface and the volume of intravascular blood therebeneath;

    the green light from said second emitter of green light having a second peak wavelength and a second wavelength band associated therewith;

    said second peak wavelength being within the range of about 500-600 nm;

    light at said second peak wavelength having absorption coefficients with respect to oxyhemoglobin and deoxyhemoglobin;

    at least one of the absorption coefficients of light at said first peak wavelength being different than the respective absorption coefficient of light at said second peak wavelength;

    the green light from said second emitter of green light interacting with deoxyhemoglobin in the volume of intravascular blood, thereby generating a second optical signal;

    the second optical signal having an intensity;

    (c) an electromagnetic radiation sensor electrically connected to an electronic signal generator;

    said electromagnetic radiation sensor adapted to be optically coupled to the skin surface for reception of the first and second optical signals;

    said electronic signal generator generating an electrical signal responsive to said electromagnetic radiation sensor, the electrical signal corresponding to the intensity of the optical signal being received by said electromagnetic sensor; and

    (d) a signal analyzer connected to said electronic signal generator for determining from the electrical signal the oxygen saturation of the hemoglobin within the volume of blood.

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