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Modulated physiological sensor

  • US 9,782,077 B2
  • Filed: 08/13/2012
  • Issued: 10/10/2017
  • Est. Priority Date: 08/17/2011
  • Status: Active Grant
First Claim
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1. A modulated physiological sensor for determining a physiological parameter, the modulated physiological sensor comprising:

  • an accelerometer coupled with a surface area of a skin of a living being, said accelerometer configured to detect a physiological signal responsive to a physiological process of the living being, wherein the physiological process comprises a respiration process;

    an emitter that emits light towards the surface area of the skin of the living being;

    a detector that detects the emitted light after attenuation from the skin of the living being, the detector having a cutoff frequency;

    a first modulator that varies a coupling of the detector to the surface area at a first modulation frequency greater than the cutoff frequency, thereby at least modulating the detected light attenuation signal at the first modulation frequency greater than the cutoff frequency;

    a second modulator that provides an active pulsation to the skin of living being, wherein the accelerometer, the emitter, the detector, the first modulator, and the second modulator are mounted on a single substrate; and

    a monitor that controls the first modulator to generate physiological measurement of pulsatile blood flow for blood constituent analysis and the physiological signal from the accelerator and controls the second modulator to generate physiological measurement of non-pulsatile blood flow.

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