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MEASUREMENT OF PHYSIOLOGICAL SIGNALS

  • US 20090105556A1
  • Filed: 09/29/2008
  • Published: 04/23/2009
  • Est. Priority Date: 09/28/2007
  • Status: Abandoned Application
First Claim
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1. A system comprising:

  • an optical sensor configured to be positioned on an area of skin of a patient, the optical sensor including;

    a light source for illuminating a capillary bed in the area of skin;

    a photodetector configured to receive an optical signal from the capillary bed resulting from the illumination and to convert the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed; and

    a signal processing module configured to process the electrical signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient.

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