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Patient monitor for monitoring microcirculation

  • US 10,271,749 B2
  • Filed: 10/30/2017
  • Issued: 04/30/2019
  • Est. Priority Date: 02/25/2011
  • Status: Active Grant
First Claim
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1. A method for monitoring a patient and non-invasively determining a microcirculation state at an eyelid of the patient, the method comprising:

  • receiving, from a non-invasive physiological sensor, a signal responsive to light of at least a first wavelength and a second wavelength that is transmitted by the non-invasive physiological sensor and detected by the non-invasive physiological sensor after the light interacts with tissue of an eyelid of a patient;

    processing the signal to determine at least;

    a first parameter indicative of a measure of perfusion of the tissue of the eyelid of the patient, anda second parameter responsive to at least a ratio of the detected light at the first wavelength and the second wavelength;

    determining a relationship between the first parameter and the second parameter;

    comparing the determined relationship with at least some of a plurality of stored relationships corresponding to one or more microcirculation states; and

    determining a microcirculation state at the eyelid based at least in part on the comparing the determined relationship with the at least some of the plurality of stored relationships.

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