A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 1/16 (2006.01)
Patent
CA 2364677
A method is described for determining recirculation of blood in a vascular access (11) of a patient undergoing dialysis treatment by means of a dialysis machine (10) comprising an arterial line (24) for withdrawing blood from the patient's body, a dialysis filter (16), and a venous line (26) for returning the blood to the patient's body. The present method consists in inducing, in the blood flowing in the venous line (26), a disturbance of a magnitude such as to bring the system into a transient state and determining blood recirculation in the vascular access (11) during the transient state as a function of the magnitude of the disturbance induced in the arterial line (24). In particular, the aforesaid disturbance consists of the variation of the haemoglobin concentration in the blood flowing in the venous line (26) and the variation is caused by controlling a change in the ultrafiltration flow in dialysis filter (16).
L'invention concerne un procédé pour déterminer une recirculation sanguine dans un accès (11) vasculaire d'un patient sous traitement de dialyse mis en oeuvre par un dialyseur (10). Le dialyseur comporte un circuit artériel (24) pour retirer le sang provenant du corps du patient, un filtre (16) de dialyse et un circuit veineux (26) pour retourner le sang vers le corps du patient. Le procédé comporte les étapes consistant à : induire dans l'écoulement de sang du circuit veineux (26) une perturbation d'une intensité permettant d'obtenir un état transitoire du système, et déterminer la recirculation sanguine dans l'accès (11) vasculaire pendant l'état transitoire en fonction de l'intensité de la perturbation induite dans le circuit artériel (24). En particulier, ladite perturbation consiste à faire varier la concentration d'hémoglobine dans le sang du circuit veineux (26), cette variation étant réglée par une modification de l'écoulement d'ultrafiltration dans le filtre (16) de dialyse.
Bosetto Antonio
Fava Massimo
Paolini Francesco
Gambro Hospal (schweiz) Ag
Hospal Ag
Robic
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