System or method for assessing a subject's peripheral blood circulation
First Claim
Patent Images
1. A system that is configured to produce an indicator that measures a response of a blood circulation system of a subject to postural change, comprising:
- pre-processing circuitry configured to detect a signal dependent upon an arterial blood volume in a limb of the subject when the subject is in a first posture and configured to detect a signal dependent upon an arterial blood volume in the limb of the subject responsive to a change in the subject'"'"'s posture from the first posture to a second posture, different from the first posture; and
processing circuitry configured to calculate a quantitative indicator that quantifies the response of the subject'"'"'s blood circulation system to postural change and is dependent upon a ratio of a first input value to a second input value,wherein the processing circuitry is configured to determine automatically when the posture change occurs,the processing circuitry is configured to control the first input value to be the signal detected prior to the detected postural change; and
the processing circuitry is configured to control the second input value to be the signal detected after the detected postural change.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for assessing blood circulation in a subject'"'"'s limb, including detection means for detecting a signal dependent upon the arterial blood volume in a limb of the subject when the subject is in a first posture and also when the subject is in a second posture, different to the first posture; and processing means for calculating a quantitative indicator that is dependent upon the ratio of the signal for the first posture to the signal for the second posture.
-
Citations
52 Claims
-
1. A system that is configured to produce an indicator that measures a response of a blood circulation system of a subject to postural change, comprising:
-
pre-processing circuitry configured to detect a signal dependent upon an arterial blood volume in a limb of the subject when the subject is in a first posture and configured to detect a signal dependent upon an arterial blood volume in the limb of the subject responsive to a change in the subject'"'"'s posture from the first posture to a second posture, different from the first posture; and processing circuitry configured to calculate a quantitative indicator that quantifies the response of the subject'"'"'s blood circulation system to postural change and is dependent upon a ratio of a first input value to a second input value, wherein the processing circuitry is configured to determine automatically when the posture change occurs, the processing circuitry is configured to control the first input value to be the signal detected prior to the detected postural change; and the processing circuitry is configured to control the second input value to be the signal detected after the detected postural change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method of assessing a subject by producing a subject-dependent indicator that measures a response of a subject'"'"'s blood circulation system to postural change, comprising:
-
providing, as a first input value to a calculation performed by a processor, a signal dependent upon an arterial blood volume in a limb of the subject when the subject is in a first posture prior to a postural change; providing, as a second input to a calculation performed by the processor, a non-steady state signal dependent upon an arterial blood volume in the limb of the subject after a change in subject posture from the first posture to a second posture, different to the first posture; and using a processor to calculate a quantitative subject-dependent indicator that measures the response of the subject'"'"'s blood circulation system to the postural change and is dependent upon a ratio of the first input value to the second input value. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A system for producing an indicator that measures a response of a blood circulation system of a subject to postural change, comprising:
-
a sensor configured to measure a parameter dependent upon a blood volume in a limb of the subject when the subject is in a first posture to produce a measured parameter for the first posture, and configured to measure the parameter dependent upon the blood volume in the limb of the subject after a change in the subject'"'"'s posture from the first posture to a second posture, different from the first posture to produce a measured parameter for the second posture; circuitry configured to separate the measured parameter for the first posture into a first component and a second component, and separate the measured parameter for the second posture into a first component and a second component; and a processor configured to calculate a quantitative indicator that measures the response of the subject'"'"'s blood circulation system to postural change, wherein the processor is configured to perform a calculation that takes as a first input value the first component of the measured parameter for the first posture, measured prior to the postural change, and that takes as a second input value that is non-steady state, the first component of the measured parameter for the second posture, measured after the postural change. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
-
-
39. A method of assessing a subject by producing a subject-dependent indicator that measures a response of a subject'"'"'s blood circulation system to postural change, comprising:
-
measuring a parameter dependent upon a blood volume in a limb of the subject when the subject is in a first posture prior to a postural change; separating the measured parameter, for the first posture, into a first component and a second component; after a change in the subject'"'"'s posture from the first posture to a second posture, different to the first posture, measuring the parameter dependent upon the blood volume in the limb of the subject, the parameter being non-steady state; separating the measured parameter for the second posture, measured after the postural change, into a first component and a second component; and using a processor to calculate a quantitative indicator wherein the calculation takes as inputs the first component of the measured parameter for the first posture and the first component of the measured parameter for the second posture, measured after the postural change. - View Dependent Claims (40, 41, 42, 43, 44)
-
-
45. A system for assessing a blood circulation of a subject, comprising:
-
a first sensor configured to measure a first parameter dependent upon a blood volume in a limb of the subject when the subject is in a first posture and when the subject is in a second posture; circuitry configured to separate the first parameter for the first posture into first and second components, and to separate the first parameter for the second posture into first and second components; a second sensor configured to measure a second parameter dependent upon the blood volume in a limb of the subject when the subject is in the first posture and is in the second posture; circuitry configured to separate the second parameter for the first posture into first and second components, and to separate the second parameter for the second posture into first and second components; and processing circuitry configured to calculate a quantitative indicator wherein the processing circuitry takes as inputs for the calculation the first and second components of the first parameter for the first posture, the first and second components of the first parameter for the second posture, the first and second components of the second parameter for the first posture and the first and second components of the second parameter for the second posture, wherein the first sensor measures red light and the second sensor measures infrared light. - View Dependent Claims (46, 47, 48)
-
-
49. A method of assessing a blood circulation of a subject, comprising:
-
measuring, at a first sensor, a first parameter dependent upon a blood volume in a limb of the subject when the subject is in a first posture; separating the measured first parameter for the first posture into first and second components; measuring a second parameter dependent upon the blood volume in the limb of the subject when the subject is in the first posture; separating the measured second parameter for the first posture into first and second components; measuring a first parameter dependent upon the blood volume in the limb of the subject when the subject is in a second posture; separating the measured first parameter for the second posture into first and second components; measuring a second parameter dependent upon the blood volume in the limb of the subject when the subject is in the second posture, the second parameter being non-steady state; separating the measured second parameter for the second posture into first and second components; and calculating a quantitative indicator using as inputs for the calculation the first and second components of the first parameter for the first posture, the first and second components of the first parameter for the second posture, the first and second components of the second parameter for the first posture, and the first and second components of the second parameter for the second posture, wherein the first parameter is a measurement of red light and the second parameter is a measurement of infrared light. - View Dependent Claims (50, 51, 52)
-
Specification