Extravasation detection technique

A - Human Necessities – 61 – M

Patent

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A61M 5/168 (2006.01)

Patent

CA 2311343

The technique for detecting extravasation during the injection of fluid into a patient involves the establishment of a baseline representing impedance at the zone of the injection prior to the injection starting. Extravasation is signaled when at least two characteristics appear. First is that the impedance varies from the baseline more than a predetermined amount in more than a predetermined number of discreet time slots called epochs herein. Second is that, the rate of change of the impedance, which is called the slop herein, is consistently greater than a predetermined amount.

L'invention se rapporte à une technique de détection d'un épanchement au cours de l'injection d'un fluide pratiquée sur un patient. Cette technique consiste en l'établissement d'une impédance de référence au niveau de la zone d'injection, avant le début de l'injection. L'épanchement est détecté lorsqu'au moins deux caractéristiques sont établies. La première consiste en une variation de l'impédance, par rapport à la valeur de référence, d'une quantité supérieure à une valeur préétablie dans plus qu'un nombre préétabli de tranches temporelles distinctes appelées ici "époques". La seconde consiste en ce que la vitesse de variation de l'impédance, appelée ici "pente", est supérieure, en permanence, à une valeur préétablie.

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