Method and device for processing a time-dependent...

A - Human Necessities – 61 – M

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A61M 1/36 (2006.01) A61M 5/168 (2006.01)

Patent

CA 2728875

A monitoring device is arranged to receive a time-dependent measurement signal (d(n)) from a pressure sensor in a fluid containing system, which is associated with a first pulse generator and a second pulse generator. The pressure sensor is arranged in the fluid containing system to detect a first pulse originating from the first pulse generator and a second pulse originating from the second pulse generator. The monitoring device is configured to process the measurement signal (d(n)) to remove the first pulse. In this process, the monitoring device receives (201) the measurement signal (d(n)), obtains (202) a first pulse profile (u(n)) which is a predicted temporal signal profile of the first pulse, and filters (203) the measurement signal (d(n)) in the time-domain, using the first pulse profile (u(n)), to essentially eliminate the first pulse while retaining the second pulse. The fluid containing system may include an extracorporeal blood flow circuit, e.g. as part of a dialysis machine, and a blood circuit of a human patient.

Linvention concerne un dispositif de surveillance qui est disposé de manière à recevoir un signal de mesure dépendant du temps (d(n)) de la part dun capteur de pression dans un système contenant un fluide, qui est associé avec un premier générateur dimpulsions et un deuxième générateur dimpulsions. Le capteur de pression est disposé dans le système contenant un fluide pour détecter une première impulsion de pression provenant du premier générateur dimpulsions et une deuxième impulsion de pression provenant du deuxième générateur dimpulsions. Le dispositif de surveillance est configuré pour traiter le signal de mesure (d(n)) afin de supprimer la première impulsion. Dans ce processus, le dispositif de surveillance reçoit (201) le signal de mesure (d(n)), obtient (202) un premier profil dimpulsion (u(n)) qui est un profil de signal temporel prévisionnel de la première impulsion, et filtre (203) le signal de mesure (d(n)) dans le domaine temporel en utilisant le premier profil dimpulsion (u(n)), essentiellement pour éliminer la première impulsion tout en conservant la deuxième impulsion. Le système contenant un fluide peut inclure un circuit de circulation sanguine extracorporelle, par exemple faisant partie dune machine de dialyse, et un circuit sanguin dun patient humain.

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