Patient monitor for monitoring microcirculation
First Claim
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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Abstract
A patient monitor capable of measuring microcirculation at a tissue site includes a light source, a beam splitter, a photodetector and a patient monitor. Light emitted from the light source is split into a reference arm and a sample arm. The light in the sample arm is directed at a tissue site, such as an eyelid. The reflected light from the tissue site is interfered with the light from the reference arm. The photodetector measures the interference of the light from both the sample arm and the reference arm. The patient monitor uses the measurements from the photodetector to calculate the oxygen saturation at the tissue site and monitor the microcirculation at the tissue site.
808 Citations
21 Claims
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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:
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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, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A patient monitor, comprising:
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a sensor interface configured to receive a signal from a physiological sensor, wherein the physiological sensor is configured to transmit light of at least a first wavelength and a second wavelength into tissue of an eyelid of a patient and to detect the light after it interacts with the tissue of the eyelid of the patient, wherein the signal is responsive to the detected light; and one or more processors configured to; determine a first parameter indicative of a measure of perfusion of the tissue of the eyelid of the patient and a second parameter responsive to at least a ratio of the detected light at the first wavelength and the second wavelength, determine a relationship between the first parameter and the second parameter, compare the determined relationship with at least some of a plurality of previously determined relationships corresponding to one or more microcirculation states, and determine a microcirculation state at the eyelid based at least in part on the comparison of the determined relationship with the at least some of the plurality of previously determined relationships. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification