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Device for Determining Physiological Variables

  • US 20090270699A1
  • Filed: 11/02/2006
  • Published: 10/29/2009
  • Est. Priority Date: 11/15/2005
  • Status: Abandoned Application
First Claim
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1. A device for the optical determination of physiological variables (pV'"'"'s) in perfused tissue with(a) at least a first light source (LEDa) and a second light source (LEDb), which emit light of a first and a second predetermined wavelength, wherein the light sources are disposed in such a way that the light they emit is able to penetrate the perfused tissue;

  • (b) at least one photodetector (PD), which is disposed in such a way that it detects the light that is emitted by the light sources and transmitted and/or backscattered by the perfused tissue;

    (c) a control unit, which supplies control signals to the light sources in such a way that the light sources continuously emit light in alternation with each other, wherein one or more dark phases can be inserted in this sequence, in which at least one of the light sources emits no light;

    (d) an evaluation unit, which is connected with the output of the photodetector (PD),(e) wherein, for at least one pV to be measured, the evaluation unit supplies a displayable output signal to an interface that can be connected to the evaluation unit.

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