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BLOOD PULSE MEASURING EMPLOYING REFLECTED RED LIGHT

  • US 3,769,974 A
  • Filed: 06/29/1971
  • Issued: 11/06/1973
  • Est. Priority Date: 06/29/1971
  • Status: Expired due to Term
First Claim
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1. A method of sensing variations in pulsatile blood in a living body without substantially heating the pulsatile blood or tissue of the living body, said method comprising the steps of providing a plurality of light sources capable of emitting red light of a wavelength between 6,000 and 9,000 angstroms at substantially ambient temperature, positioning the light sources adjacent to the outer surface of the skin of the living body, transmitting red light of a wavelength between 6,000 and 9,000 angstroms from the light sources through the skin of the living body toward a portion of the living body in which pulsatile blood is flowing without heating the living body, reflecting red light from the pulsatile blood of the living body, sensing the intensity of the light reflected from the pulsatile blood of the living body, and providing an output signal in accordance with the intensity of the sensed light.

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