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Non-contact optical monitoring of physiological parameters

  • US 5,995,856 A
  • Filed: 11/22/1995
  • Issued: 11/30/1999
  • Est. Priority Date: 11/22/1995
  • Status: Expired due to Term
First Claim
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1. A method of remotely monitoring a characteristic of arterial blood in pulsatile tissue, comprising the steps of:

  • providing a light source including optics for illuminating a first area of tissue, a light detector including collection optics for collecting essentially only re-emitted light from a second area of the tissue spaced a predetermined distance from said first area, and means for mounting the light source and light detector remotely from the pulsatile tissue;

    positioning said mounting means remotely from the first and second areas of tissue and tissue adjacent thereto;

    projecting light from the light source on the first area of tissue;

    collecting light with the light detector from the second area of tissue; and

    calculating the characteristic of the arterial blood in the pulsatile tissue using a first step which separates time dependent from non-time dependent collected light intensities and a second step which utilizes said time dependent light intensities to calculate the characteristics of the arterial blood in the pulsatile tissue.

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