Patient monitor for determining microcirculation state
First Claim
1. A method of determining blood vessel flow state comprising:
- generating a plurality of stored data points wherein a data point comprises an oxygen saturation value and a perfusion index value, the plurality of data points generated periodically by;
determining an oxygen saturation value of blood from measured red and infrared light absorption characteristics of tissue at a tissue monitoring site monitored by a physiological sensor;
determining a perfusion index value from the measured infrared light absorption characteristic of the tissue at the measuring site; and
storing the measured oxygen saturation and perfusion index;
determining a relationship between the stored data points;
comparing the determined relationship with stored microcirculation data corresponding to a blocked or partially blocked microcirculation state, the stored microcirculation data representing a relationship between oxygen saturation and perfusion index; and
determining a current microcirculation state of at least a portion of blood vessels at the monitoring site from the comparison with the microcirculation data.
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Accused Products
Abstract
As placement of a physiological monitoring sensor is typically at a sensor site located at an extremity of the body, the state of microcirculation, such as whether vessels are blocked or open, can have a significant effect on the readings at the sensor site. It is therefore desirable to provide a patient monitor and/or physiological monitoring sensor capable of distinguishing the microcirculation state of blood vessels. In some embodiments, the patient monitor and/or sensor provide a warning and/or compensates a measurement based on the microcirculation state. In some embodiments, a microcirculation determination process implementable by the patient monitor and/or sensor is used to determine the state of microcirculation of the patient.
883 Citations
15 Claims
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1. A method of determining blood vessel flow state comprising:
- generating a plurality of stored data points wherein a data point comprises an oxygen saturation value and a perfusion index value, the plurality of data points generated periodically by;
determining an oxygen saturation value of blood from measured red and infrared light absorption characteristics of tissue at a tissue monitoring site monitored by a physiological sensor; determining a perfusion index value from the measured infrared light absorption characteristic of the tissue at the measuring site; and storing the measured oxygen saturation and perfusion index; determining a relationship between the stored data points; comparing the determined relationship with stored microcirculation data corresponding to a blocked or partially blocked microcirculation state, the stored microcirculation data representing a relationship between oxygen saturation and perfusion index; and determining a current microcirculation state of at least a portion of blood vessels at the monitoring site from the comparison with the microcirculation data. - View Dependent Claims (2, 3, 4, 5)
- generating a plurality of stored data points wherein a data point comprises an oxygen saturation value and a perfusion index value, the plurality of data points generated periodically by;
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6. A method of non-invasively determining blood vessel flow state comprising:
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determining one or more measurement values for a first physiological parameter at a tissue monitoring site monitored by a non-invasive physiological sensor; determining one or more measurement values for a second physiological characteristic monitored at the tissue monitoring site; determining a relationship between the first physiological parameter and the second physiological parameter; comparing the determined relationship with stored microcirculation data, the stored blocked or partially blocked microcirculation data corresponding to a microcirculation state of microcirculation blood vessels, the stored microcirculation data representing a relationship between the first physiological parameter and the second physiological parameter; and determining a current microcirculation state of at least a portion of blood vessels at the tissue monitoring site from the comparison with the microcirculation data. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification