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Patient monitor for monitoring microcirculation

  • US 9,801,556 B2
  • Filed: 06/22/2015
  • Issued: 10/31/2017
  • Est. Priority Date: 02/25/2011
  • Status: Active Grant
First Claim
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1. A method for monitoring microcirculation of a patient at an eyelid, the method comprising:

  • receiving a plurality of signals corresponding to light detected by a sensor after having been reflected and/or refracted at a tissue site of an eyelid, wherein the light comprises at least a red beam having a red wavelength and an infrared (IR) beam having an infrared wavelength;

    calculating oxygen saturation based at least in part on a ratio of a first signal of the plurality of signals that corresponds to the red beam with respect to a second signal of the plurality of signals that corresponds to the IR beam;

    calculating a perfusion index based at least in part on a signal strength of at least one of the plurality of signals;

    determining a ratio between the oxygen saturation and the perfusion index;

    comparing the determined ratio with stored microcirculation data corresponding to one or more microcirculation states; and

    determining a microcirculation state of at least a portion of blood vessels in the eyelid based at least in part on the comparison of the determined ratio with the stored microcirculation data.

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