Device and method for monitoring access to a patient, in...

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/36 (2006.01) A61M 5/14 (2006.01) A61M 39/28 (2006.01)

Patent

CA 2643104

The invention relates to a device and to a method wherein access to a patient, in particular access to vessels, can be monitored during extracorporeal blood treatment during which a loop (27) is formed in the arterial and/or venous line (6, 7). Inventive means (26) for fixing a section of the line in the form of a loop are provided. When the line is stressed under tension, the loop contracts until the line finally kinks. The modification of the diameter of the line and finally the formation of a kink in the line leads to a rise of pressure in the line, which is monitored by a pressure monitoring device. If the pressure exceeds a predetermined threshold value, the aspirating cannula is in danger of slipping out of the vessel access, has partially or has completely slipped out thus allowing the threshold value to be determined for prealarms or alarms.

L'invention concerne un dispositif et un procédé, selon lesquels l'accès à un patient, en particulier l'accès à des vaisseaux lors d'un traitement du sang extra-corporel, peut être surveillé. Lors du traitement du sang extra-corporel, une boucle (27) est formée dans la ligne (6, 7) artérielle et/ou veineuse. L'invention concerne également des moyens (26) permettant la fixation d'une partie de la ligne sous la forme d'une boucle. Lorsque la ligne est contrainte sous tension, la boucle se contracte jusqu'à ce que la ligne se courbe. La modification du diamètre de la ligne et finalement la formation d'une courbure dans la ligne permettent une augmentation de la pression dans la ligne, laquelle est surveillée par un dispositif de surveillance de la pression. Si la pression dépasse une valeur seuil prédéterminée, la canule d'aspiration menace de sortir en glissant de l'accès au vaisseau, ou est sortie partiellement ou totalement, les valeurs seuil pouvant être déterminées par des préalarmes ou des alarmes.

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