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SYSTEMS AND METHODS FOR DETERMINING PHYSIOLOGICAL CHARACTERISTICS OF A PATIENT USING PULSE OXIMETRY

  • US 20140073887A1
  • Filed: 05/14/2012
  • Published: 03/13/2014
  • Est. Priority Date: 05/17/2011
  • Status: Active Grant
First Claim
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1. A method for controlling an electronic device to operate an external sensor to obtain one or more vital signs, the electronic device having an audio interface comprising a plurality of contacts, the external sensor connectable to the audio interface and comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths, the method comprising:

  • applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the one or more emitters of the external sensor;

    receiving the response signal at a third contact of the audio interface;

    demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal;

    analyzing the first and second wavelength response signals to determine one or more vital signs; and

    outputting the determined one or more vital signs.

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