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Optical sensor for pulse oximeter

  • US 4,880,304 A
  • Filed: 04/01/1987
  • Issued: 11/14/1989
  • Est. Priority Date: 04/01/1987
  • Status: Expired due to Term
First Claim
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1. An optical sensor, comprising:

  • a housing, said housing having a general flat lower surface with a central protrusion extending a predetermined distance from said lower surface, said protrusion adapted to provide an optical couple between said sensor and the surface of a patient'"'"'s tissue;

    a first source of light at a first wavelength for which the absorption coefficients of hemoglobin and oxyhemoglobin are approximately equal and a second source of light at a second wavelength for which said absorption coefficients differ from one another, said first and second sources of light mounted in said central protrusion extending from said lower surface;

    light detecting means mounted in said protrusion of said housing to detect light at said first and second wavelengths after contact with arterial blood; and

    light absorbing means on said lower surface of said housing surrounding said central protrusion for preventing the transmission of ambient light between the lower surface of said housing and said tissue.

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