JPWO2020260981A5 - - Google Patents

Claims (9)

an occlusive element (OC) configured to be attached to a proximal portion of a human limb and apply occlusive pressure;
a expansion sensing element (VS) attached to a distal portion of a human limb and configured to sense the degree of expansion;
A control circuit (10) coupled to said occluding element (OC) and said extended sensing element (VS), said control circuit (10) comprising:
i) to apply (203) at least one diastolic occlusion pressure (P _OC ) and maintain (204) said at least one diastolic occlusion pressure (P _OC ) for a specified occlusion interval (TP _OC ); , controlling ( 104, 106) the occlusion element (OC);
-ii) obtaining (108; 108a, 108b) a detection signal from said extended sensing element (VS);
-iii) said sensing that at least one said diastolic occlusion pressure (P _oc ) has been removed after said occlusion interval (TP _oc ) resulting in a change in expansion of the distal portion of the human limb; checking (208) in the signal;
-iv ) there is a constant change in expansion of the distal portion of the human limb due to at least one said diastolic occlusion pressure (P _OC ) being removed after said occlusion interval (TP _OC ); and said checking (208) results in a signal (102, 210) indicative of a venous pressure in said human limb that is less than said at least one applied diastolic occlusion pressure ( _POC ). The device that performs the steps . The removal of at least one of the diastolic occlusion pressures (P _OC ) after the occlusion interval (TP _OC ) does not show any change in the expansion of the distal portion of the human limb. , as a result of said checking (208), said control circuit (10) controls (104 , 106) said occlusion elements (OC) to be less than said at least one said diastolic occlusion pressure ( _POC ). 2. The device of claim 1, configured to repeat steps i)-iv) by applying (203) a high occlusion pressure (P _OC ). said occlusion interval (TP _OC ) for a duration of 5 seconds or more, preferably between about 10 seconds and about 30 seconds, or between about 20 seconds and about 40 seconds, or between about 5 seconds and about 10 seconds 3. The device of claim 1 or claim 2, comprising: The control circuit (10) controls (104, 106 ) the occlusion element (OC) to apply (203) an occlusion pressure (P _OC ) in the range of about 5 mmHg to 35 mmHg or about 4 mmHg to 24 mmHg. A device according to any one of claims 1 to 3, configured. 5. Any of claims 1 to 4, wherein the control circuit (10) is configured to vary the duration of the occlusion interval (TP _OC ), preferably as a function of the applied occlusion pressure (P _OC ). or a device according to paragraph 1. Device according to any one of the preceding claims, wherein said extended sensing element (VS) comprises a pressure sensor (108a , 108b) and said sensing signal comprises a pressure signal (P _SC ). The device according to any one of the preceding claims, wherein said extended sensing element (VS) comprises an optical plethysmographic sensor and said sensing signal comprises an optical plethysmographic signal. The control circuit (10) detects (208) variation in the sensing signal by an amount exceeding a variation threshold, and as a result of detecting variation in the sensing signal by an amount exceeding the variation threshold , at least 8. The apparatus of any one of claims 1 to 7, adapted to generate said signal (102 , 210) indicative of a venous pressure of said human limb (VP<P _OC ) lower than one of said diastolic occlusion pressures . device described in section. at least one of said occlusive element (OC) and said expanded sensing element (VS) comprises a cuff configured to be attached to a human limb , said cuff preferably being pre-expanded, and A device according to any one of the preceding claims, pre-stressed to a particular lapping strength.