Method and device for measuring access flow

Details Method and device for measuring access flow Method and device for measuring access flow

A - Human Necessities

61

M

A61M 1/36 (2006.01) A61B 5/026 (2006.01) A61M 1/16 (2006.01) G01F 9/00 (2006.01)

Patent

CA 2345965

An arterial needle removes blood from the access to an extracorporeal circuit comprising a dialyzer and a venous needle returns the blood to the access site. Blood passes along one side of the membrane of the dialyzer and dialysis fluid along the other side. The concentration (Cd norm and Cd rev) of urea in the dialysate emitted from the dialyzer is measured with the needles in the normal position and in a reversed position. The access flow rate before the arterial needle is calculated according to the formula: Cd norm / Cd rev = 1 + Keff/Qa in which Keff is the effective clearance of the dialyzer and Qa is the access flow rate.

Selon cette invention, une aiguille artérielle évacue le sang depuis l'accès à la circulation sanguine et l'achemine vers un circuit extracorporel comprenant un dialyseur tandis qu'une aiguille veineuse renvoie le sang vers le site d'accès. Le sang circule le long d'un des côtés de la membrane du dialyseur, le fluide de dialyse circulant de l'autre côté. La concentration d'urée (Cd norm et Cd rev) dans le dialysat est mesurée par les aiguilles en positions normale et inversée. Le débit du flux d'accès en amont de l'aiguille artérielle est calculé selon la formule: Cd norm / Cd rev = 1 + Keff/Qa dans laquelle Keff est le jeu efficace du dialyseur et Qa est le débit à la hauteur de l'accès.

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