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Acoustic respiratory monitoring sensor with probe-off detection

  • US 9,750,461 B1
  • Filed: 12/20/2013
  • Issued: 09/05/2017
  • Est. Priority Date: 01/02/2013
  • Status: Active Grant
First Claim
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1. A method of determining a connection state between a non-invasive acoustic sensor and a medical patient, the method comprising:

  • receiving an acoustic physiological signal from an acoustic sensor configured to couple with a medical patient;

    receiving a photoplethysmograph (PPG) waveform from an optical sensor configured to couple with the medical patient;

    extracting low frequency components from the acoustic physiological signal;

    extracting high frequency components from the acoustic physiological signal;

    calculating an acoustic pulse rate measurement from the extracted low frequency components;

    calculating a respiration rate measurement from the extracted high frequency components;

    calculating an optical pulse rate measurement from the PPG waveform;

    determining a difference between the acoustic pulse rate measurement calculated from the acoustic physiological signal and the optical pulse rate measurement calculated from the PPG waveform;

    comparing the difference with a threshold value; and

    in response to said comparison, outputting the calculated respiration rate measurement with an indication of connection quality of the non-invasive acoustic sensor.

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