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Reflection-detector sensor position indicator

  • US 8,761,850 B2
  • Filed: 12/21/2012
  • Issued: 06/24/2014
  • Est. Priority Date: 10/13/2008
  • Status: Active Grant
First Claim
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1. An optical sensor configured to provide an indication of a physiological parameter comprising:

  • a plurality of emitters that transmit light having a plurality of wavelengths;

    a detector that outputs a sensor signal, the sensor signal responsive to the emitter transmitted light after attenuation by pulsatile blood flow perfused within a fingernail bed underneath the fingernail, the detector positioned on a different side of the fingernail bed from the plurality of emitters; and

    at least one reflection detector that outputs at least one sensor position signal, the reflection detector positioned on the same side of the fingernail bed as the plurality of emitters.

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