Reflection-detector sensor position indicator

摘要

A reflection-detector sensor position indicator comprises emitters that transmit light having a plurality of wavelengths. A detector outputs a sensor signal. At least one reflection detector outputs at least one sensor position signal. An attachment assembly attaches the emitters, the detector and the reflection detector onto a tissue site. A sensor-on condition indicates that the attachment assembly has positioned the emitters generally centered over a fingernail, the detector on a fingertip opposite the fingernail and the reflection detector over the fingernail. The sensor signal, in the sensor-on condition, is at least substantially responsive to the emitter transmitted light after attenuation by pulsatile blood flow perfused within a fingernail bed underneath the fingernail. The sensor position signal, in the sensor-on condition, is at least substantially responsive to the emitter transmitted light after reflection off of the fingernail.

主权项

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.