Air detector

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/36 (2006.01) G01N 29/032 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2223972

The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ul- trasonic transmitter and ultrasonic re- ceiver are separated by the IV tube. The apparatus further provides cir- cuit means for generating at least two transmitting signals to actuate the ul- trasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The appara- tus further relies on logarithmic de- tection of air in fluids rather than lin- ear detection which provides a larger safety factor in prediction of air em- bolus.

L'invention concerne un dispositif permettant de détecter de l'air en excès dans un tube pour écoulement de liquide. Le dispositif comporte un émetteur d'ultrasons qui transmet des signaux ultrasonores et un récepteur d'ultrasons qui reçoit des signaux ultrasonores. L'émetteur et le récepteur sont séparés par le tube à perfusion intraveineuse. Le dispositif comporte également un circuit qui génère au moins deux signaux d'émission destinés à actionner l'émetteur d'ultrasons et au moins un circuit qui détecte les signaux reçus. Il comporte enfin un système permettant de déterminer si le signal reçu indique la présence d'air ou de liquide dans le tube. Il se base sur la détection logarithmique de l'air dans les fluides plutôt que sur la détection linéaire, ce qui donne un facteur de sécurité plus grand dans le risque d'embole gazeux.

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