Reflection-detector sensor position indicator
First Claim
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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Accused Products
Abstract
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.
795 Citations
19 Claims
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1. An optical sensor configured to provide an indication of a physiological parameter comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sensor position indicating method comprising:
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activating a plurality of emitters with an emitter activation signal so as to transmit light; receiving a sensor position signal from a reflection detector responsive to reflections of the transmitted light; receiving a light attenuation signal from a detector that is responsive to the emitter transmitted light after attenuation by pulsatile blood flow, the detector positioned on an different side of a living tissue measurement site from the plurality of emitters; and indicating a tissue placement condition in response to the sensor position signal. - View Dependent Claims (8, 9, 10, 11)
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12. A physiological measurement system comprising:
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a sensor having an attachment assembly configured to position emitters over a living tissue measurement site and to position a detector on a different side of the measurement site so that the emitters are positioned to transmit multiple wavelength light into the measurement site and so that the detector is positioned to detect the transmitted light after attenuation by pulsatile blood flow perfused within the tissue site and generate a sensor signal responsive to the intensity of the detected light; a second detector incorporated within the sensor that generates a sensor position signal responsive to the position of the emitters with respect to the tissue site; and an audible indicator of multiple ones of a sensor-on condition, a sensor-off condition, a sensor under-positioned condition and a sensor over-positioned condition. - View Dependent Claims (13, 14)
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15. A sensor position indicator comprising:
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an emitter means for transmitting light into a tissue site; a detector means, positioned on a different side of the tissue site from the emitter means, for detecting light attenuated by the tissue site configured to be used to determine physiological parameters; a reflection detection means, positioned on the same side of the tissue site as the emitter means, for generating a sensor position signal responsive to reflections of the transmitted light; and a processor means for determining a sensor position condition from the magnitude of the sensor position signal. - View Dependent Claims (16, 17, 18, 19)
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Specification