Blood flow assessment of venous insufficiency
First Claim
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1. A method for use in analysing impedance measurements performed on a subject for use in diagnosing the presence, absence, or degree of venous insufficiency in the subject, the method including, in a processing system:
- determining a change in impedance, caused by calf extension of the subject or by exercise by the subject;
determining an indicator using the change in impedance, the indicator being indicative of an ejection volume to allow assessment of calf muscle pump (CMP) function, wherein the method further includes, in the processing system, determining the ejection volume using the formula;
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Abstract
Impedance analysis can be used to measure calf muscle pump (CMP) function in a patient. This may be done by applying electrical signals via a first set of electrodes, and measuring the impedance via a second set of electrodes. The change in impedance as the patient undergoes calf extension or exercise may be measured, and the change in impedance may then be used to assess CMP function. The change in impedance may be used to determine an indicator indicative of the volume of blood ejected by the CMP.
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16 Claims
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1. A method for use in analysing impedance measurements performed on a subject for use in diagnosing the presence, absence, or degree of venous insufficiency in the subject, the method including, in a processing system:
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determining a change in impedance, caused by calf extension of the subject or by exercise by the subject; determining an indicator using the change in impedance, the indicator being indicative of an ejection volume to allow assessment of calf muscle pump (CMP) function, wherein the method further includes, in the processing system, determining the ejection volume using the formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for use in analysing impedance measurements performed on a subject for use in diagnosing the presence, absence, or degree of venous insufficiency in the subject, the apparatus including a processing system configured to:
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determine a change in impedance, caused by calf extension of a subject or by exercise by a subject; determine an indicator using the change in impedance, the indicator being indicative of an ejection volume to allow assessment of calf muscle pump (CMP) function, wherein the processing system is further configured to determine the ejection volume using the formula; - View Dependent Claims (14, 15)
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16. A method for use in analysing impedance measurements performed on a subject for use in diagnosing the presence, absence, or degree of venous insufficiency in the subject, the method including:
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applying, using a signal generator, one or more electrical signals to the subject using a first set of electrodes; measuring, using a sensor, electrical signals across a second set of electrodes applied to the subject in response to the applied one or more signals, and in a processing system; determining a change in impedance, caused by calf extension of a subject or by exercise by a subject, the change in impedance determined from the applied signals and the measured signals; and
,determining an indicator using the change in impedance, the indicator being indicative of an ejection volume to allow assessment of calf muscle pump (CMP) function, wherein the method further includes, in the processing system, determining the ejection volume using the formula;
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Specification