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Low power pulse oximeter

  • US 9,848,806 B2
  • Filed: 06/03/2013
  • Issued: 12/26/2017
  • Est. Priority Date: 07/02/2001
  • Status: Expired due to Term
First Claim
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1. A method of managing power consumption during continuous patient monitoring by adjusting behavior of a pulse oximetry system, the method comprising:

  • by a pulse oximetry system,driving one or more light sources configured to emit light into tissue of a monitored patient, wherein said one or more light sources operate on a duty cycle having an active time and an inactive time;

    receiving one or more signals from one or more detectors configured to detect said light after attenuation by said tissue;

    operating said pulse oximetry system at, at least, a first power consumption level or a second power consumption level;

    determining measurement values for one or more physiological parameters of a patient using said received one or more signals at said first power consumption level, wherein said active time of said duty cycle having a first duration at said first power consumption level;

    determining measurement values for said one or more physiological parameters of a patient using said received one or more signals at said second power consumption level, wherein said active time of said duty cycle having a second duration at said second power consumption level, wherein said first duration is longer than said second duration;

    determining processing characteristics at said second power consumption level;

    determining an estimate of average power consumption of at least a portion of components of said pulse oximetry system;

    cycling operation of said pulse oximetry system between said first power consumption level and said second power consumption level so that the average power consumption of said at least a portion of components of said pulse oximetry system is consistent with a predetermined target power consumption threshold, wherein operating said pulse oximetry system at said second power consumption level is based, at least in part, on said processing characteristics.

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