Patient monitor for determining microcirculation state
First Claim
1. A patient monitor configured to determine a microcirculation state, the patient monitor comprising:
- a sensor interface configured to receive a signal from a physiological sensor, the signal indicative of first and second measurement values corresponding to respective first and second physiological parameters, wherein the physiological sensor is configured to transmit light of at least one wavelength into tissue of a patient and to detect the light after it has been attenuated by the tissue, and wherein the second physiological parameter comprises a measure of perfusion; and
one or more processors configured to;
determine a relationship between the first and second physiological parameters; and
compare the determined relationship between the first and second physiological parameters with stored lookup data indicative of a microcirculation state of blood vessels to determine if a blocked or partially blocked microcirculation state exists in at least a portion of blood vessels in the tissue;
wherein the one or more processors are further configured to generate a drive signal to configure the physiological sensor to measure a light absorption characteristic of the tissue at a different wavelength in response to the determination of the microcirculation state.
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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.
764 Citations
21 Claims
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1. A patient monitor configured to determine a microcirculation state, the patient monitor comprising:
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a sensor interface configured to receive a signal from a physiological sensor, the signal indicative of first and second measurement values corresponding to respective first and second physiological parameters, wherein the physiological sensor is configured to transmit light of at least one wavelength into tissue of a patient and to detect the light after it has been attenuated by the tissue, and wherein the second physiological parameter comprises a measure of perfusion; and one or more processors configured to; determine a relationship between the first and second physiological parameters; and compare the determined relationship between the first and second physiological parameters with stored lookup data indicative of a microcirculation state of blood vessels to determine if a blocked or partially blocked microcirculation state exists in at least a portion of blood vessels in the tissue; wherein the one or more processors are further configured to generate a drive signal to configure the physiological sensor to measure a light absorption characteristic of the tissue at a different wavelength in response to the determination of the microcirculation state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of non-invasively determining a microcirculation state, the method comprising:
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obtaining, at a tissue site by a non-invasive physiological sensor, first and second measurement values corresponding to respective first and second physiological parameters, the second physiological parameter comprising a measure of perfusion; determining a relationship between the first and second physiological parameters; comparing the determined relationship between the first and second physiological parameters with stored lookup data indicative of a microcirculation state of blood vessels to determine if a blocked or partially blocked microcirculation state exists in at least a portion of blood vessels at the tissue site; and applying an offset to at least one of the first physiological parameter or the second physiological parameter to compensate for a blocked or partially blocked microcirculation state. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A patient monitor configured to determine a microcirculation state, the patient monitor comprising:
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a sensor interface configured to receive a signal from a physiological sensor, the physiological sensor configured to transmit light of at least one wavelength into living tissue of a patient and to detect the light after it has been attenuated by the tissue; and one or more processors configured to determine a microcirculation state of the tissue based on at least a first physiological parameter derived from an analysis of detected attenuated light, and at least a measurement of perfusion; wherein the one or more processors are further configured to generate a drive signal to configure the physiological sensor to measure the light absorption characteristic of the tissue monitoring site at a different wavelength in response to the determination of the microcirculation state. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification