Coolant dosing device for finely dosing a liquefied...

A - Human Necessities – 61 – B

Patent

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A61B 18/02 (2006.01)

Patent

CA 2571006

The invention relates to a coolant dosing device for using a liquefied cryogenic gas in producing low temperatures usable, for example in cryosurgery. The aim of said invention is to ensure a reliable operation despite of a partially impure gas and to avoid operation errors which are possible up to now during a capsule fixing. For this purpose, the inventive coolant dosing device is provided with a capillary tube for receiving a filtered gas contained in the capsules and transferring said gas directly to a dispenser. The connection of the capsule to the dosing device with a low application force through a sealing O-ring assures a reliable handling.

L'invention concerne un doseur de fluide frigorigène pour l'utilisation d'un gaz liquéfié cryogénique destiné à produire des basses températures pouvant être utilisées p. ex. en cryochirurgie. L'objectif de cette invention est de garantir un fonctionnement sans défaut malgré un gaz partiellement chargé d'impuretés et d'éviter des erreurs de manipulation qui étaient jusqu'à présent possibles lors de la fixation de la capsule. A cet effet, le doseur de fluide frigorigène est pourvu d'un tube capillaire destiné à recevoir le gaz filtré contenu dans les capsules et à transférer directement ce gaz au distributeur, ce qui garantit un fonctionnement sans défaut. La fixation de la capsule sur le doseur avec une faible application de force par la traversée d'un joint torique assurant l'étanchéité garantit une manipulation sans erreur.

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