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Pulse oximeter

  • US 20020198442A1
  • Filed: 05/02/2002
  • Published: 12/26/2002
  • Est. Priority Date: 05/03/2001
  • Status: Active Grant
First Claim
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1. A method for detecting the validity of measurement circumstances in connection with a monitoring device intended for determining the amount of at least one light absorbing substance in a subject, the monitoring device comprising emitters for emitting radiation at a minimum of two wavelengths, driving means for activating said emitters, and a detector for receiving said radiation at said wavelengths and for producing an electrical signal in response to the radiation, the method comprising the steps of driving an emitter by a drive signal having predetermined characteristics, analyzing the electrical signal traveling from the direction of said detector in order to detect whether a crosstalk component caused by electric power coupled directly from said drive signal is present, and taking predetermined measures when a crosstalk component is detected.

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