Method and device for monitoring a vascular access and...

A - Human Necessities – 61 – M

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A61M 1/36 (2006.01)

Patent

CA 2719535

The invention relates to a method and a device for monitoring a vascular access during an extracorporeal blood treatment. The method and the device according to the invention are based on the monitoring of the difference between the venous pressure measured by means of a venous pressure sensor (19) and the arterial pressure measured by means of an arterial pressure sensor (18) in the extracorporeal blood circuit, said pressure being referred to as venous and arterial differential pressure. The in-vention is based on the finding that the values measured for the venous and arterial pressure are superimposed by interfering si-gnals which in general make it difficult to reliably evaluate the measured pressure signals for identifying a defective vascular ac-cess on the basis of the differential pressure only. According to the method and the device according to the invention, a test functi-on describing disturbances in the extracorporeal blood circuit is determined. Said test function is used to determine a noise-free differential pressure from the measured venous and arterial pressure, said differential pressure being evaluated in an arithmetic and evaluation unit (22) to identify a defective vascular access.

L'invention concerne un procédé et un dispositif de surveillance d'un accès vasculaire au cours d'un traitement sanguin extracorporel. Le procédé et le dispositif selon l'invention reposent sur la surveillance de la différence entre la pression veineuse mesurée au moyen d'un capteur de pression veineuse (19) et la pression artérielle mesurée au moyen d'un capteur de pression artérielle (18) dans le circuit sanguin extracorporel, cette différence étant également appelé pression différentielle veineuse et artérielle. L'invention se fonde sur la découverte que les valeurs mesurées pour les pressions veineuse et artérielle sont brouillées par des signaux parasites qui réduisent fondamentalement la fiabilité d'évaluation des signaux de pression mesurés pour l'identification d'un accès vasculaire défectueux uniquement d'après la pression différentielle. Avec le procédé et le dispositif selon l'invention, une fonction d'essai décrivant des perturbations dans le circuit sanguin extracorporel est déterminée. Cette fonction d'essai est utilisée pour déterminer, à partir des pressions veineuse et artérielle mesurées, une pression différentielle sans perturbations qui est évaluée dans une unité de calcul et d'évaluation (22) pour identifier un accès vasculaire défectueux.

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