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Determining a characteristic respiration rate

  • US 9,220,440 B2
  • Filed: 09/21/2009
  • Issued: 12/29/2015
  • Est. Priority Date: 09/21/2009
  • Status: Active Grant
First Claim
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1. A method for determining a characteristic respiration rate of a patient by a pulse oximeter, the method comprising:

  • receiving, using the pulse oximeter, a photoplethysmographic (PPG) signal derived from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the patient;

    determining, using the pulse oximeter, respiration rate values of the patient over time based at least in part on the PPG signal;

    detecting, using the pulse oximeter, a first respiration rate event, wherein the first respiration rate event is detected based at least in part on a first deviation in the respiration rate values;

    determining, using the pulse oximeter, a first altered portion of the respiration rate values based on the first respiration rate event;

    determining, using the pulse oximeter, the characteristic respiration rate of the patient based at least in part on a selected portion of the respiration rate values, wherein;

    the selected portion of the respiration rate values excludes the first altered portion of the respiration rate values;

    the selected portion of the respiration rate values occurs earlier in time than the first altered portion of the respiration rate values;

    the determining of the characteristic respiration rate is not based on the first altered portion of the respiration rate values; and

    the characteristic respiration rate is determined to assess a clinical status of the patient; and

    displaying, using an output of the pulse oximeter, the characteristic respiration rate.

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