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Physiological parameter tracking system

  • US 9,788,768 B2
  • Filed: 02/26/2013
  • Issued: 10/17/2017
  • Est. Priority Date: 08/28/2003
  • Status: Active Grant
First Claim
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1. A method of monitoring a patient'"'"'s condition by electronically tracking one or more physiological parameters of the patient through processing signals received from a noninvasive sensor, said electronically tracking including transforming said signals into measurements of said one or more physiological parameters, the method comprising:

  • receiving a physiological signal from a noninvasive physiological sensor that detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;

    electronically processing said signal in a pulse oximetry signal processor, including;

    calculating a first blood parameter responsive to the physiological signal, the first blood parameter having a first rate of amplitude change over time;

    responsive to an update command;

    in a sample period of the update command calculating a sampled value of a second blood parameter responsive to the physiological signal, the second blood parameter having a second rate of amplitude change over time, wherein the first blood parameter and the second blood parameter are different blood parameters, andin a subsequent hold period of the update command following the sample period, maintaining the sampled value of the second blood parameter calculated during the sample period,calculating a third blood parameter based at least in part on a difference between a current value of the first blood parameter and the sampled value of the second blood parameter; and

    determining a physiological measurement of oxygen saturation in the body tissue at least partly by tracking the first blood parameter by the third blood parameter such that, in the sample period, the physiological parameter represents the sampled value of the second blood parameter and, in the hold period, the physiological parameter represents an estimate of the second blood parameter based on the current value of the first blood parameter and the sampled value of the second blood parameter, wherein determining the physiological measurement using the sample period and the hold period utilizes less computational resources and consumes less power than determining the physiological measurement without the sample period and the hold period; and

    displaying the physiological measurement.

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