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Patient monitor for determining microcirculation state

  • US 9,795,310 B2
  • Filed: 10/26/2015
  • Issued: 10/24/2017
  • 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;

    a memory storing a plurality of previously determined relationships between measures of perfusion and other calculated parameters, wherein;

    at least some of the previously determined relationships correspond to an at least partially blocked microcirculation condition, andat least some of the previously determined relationships correspond to an unblocked microcirculation condition; and

    one or more processors configured to;

    during monitoring of the patient, process the signal to determine at least;

    a measure of perfusion of the tissue of the patient, andan other calculated parameter responsive to at least a ratio of the detected light at the first wavelength and the second wavelength;

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

    compare the determined relationship with at least some of the plurality of previously determined relationships;

    when the comparison indicates that the determined relationship is similar to at least one of the previously determined relationships corresponding to an at least partially blocked microcirculation condition, determine 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; and

    responsive to determining the microcirculation condition comprises an at least partially blocked microcirculation condition, perform at least one of;

    provide an electronic microcirculation condition warning 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 perfusion or the other calculated parameter to compensate for the at least partially blocked microcirculation condition.

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