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Patient monitor for determining microcirculation state

  • US 10,271,748 B2
  • Filed: 09/19/2017
  • Issued: 04/30/2019
  • Est. Priority Date: 05/06/2010
  • Status: Active Grant
First Claim
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1. A patient monitor configured to monitor a patient and determine a microcirculation condition of the patient, the patient monitor comprising:

  • a sensor interface configured to receive a signal from a physiological sensor that is configured to transmit light of at least a first wavelength and a second wavelength into tissue of a patient and to detect the light after it has been attenuated by the tissue, wherein the signal is responsive to the detected light; and

    one or more processors configured to;

    process the signal to determine at least;

    a measure of oxygen saturation of the tissue of the patient, andan other calculated parameter responsive to a physiological characteristic of the tissue of the patient;

    determine a relationship between the measure of oxygen saturation and the other calculated parameter;

    compare the determined relationship with at least some of a plurality of previously determined data sets, wherein the previously determined data sets indicate microcirculation conditions associated with different relationships between measures of oxygen saturation and other calculated parameters; and

    responsive to determining, based on said comparing, that a microcirculation condition of the patient comprises an at least partially blocked microcirculation condition in at least a portion of blood vessels in the tissue of the patient, perform at least one of;

    provide an electronic microcirculation condition indication for review by a caregiver,cause the physiological sensor to be configured to transmit at least a portion of the light at a different wavelength, orapply an offset of to at least one of the measure of oxygen saturation or the other calculated parameter to compensate for the at least partially blocked microcirculation condition.

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