PATIENT MONITOR FOR DETERMINING 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.
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Citations
25 Claims
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1. (canceled)
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2. 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, the physiological sensor 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 one or more processors configured to; determine a relationship between the first and second physiological parameters; and compare the determined relationship 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. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. 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; determining a relationship between the first and second physiological parameters; and comparing the determined relationship 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. 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 an analysis of detected attenuated light and at least an oxygen saturation measurement. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification