One-way valve device

A - Human Necessities – 61 – M

Patent

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Details

A61M 39/24 (2006.01) A61M 5/36 (2006.01) A61M 39/26 (2006.01) A61M 5/14 (2006.01)

Patent

CA 2483247

The invention relates to a one-way valve device (1), in particular a low- pressure non-return valve for use with infusion equipment. Said device consists of a housing (2, 3) comprising a supply tube (5) and a drain tube (14), in addition to at least one seal (4) that is enclosed in a pressure chamber (12). To prevent the admission of air into the infusion liquid circuit, the flow is interrupted by a static negative pressure prevailing on the supply tube (5) and/or drain tube (14) or by an excess pressure on the drain tube (14). This reliably guarantees that the infusion liquid only circulates if there is a static excess pressure on the supply tube.

L'invention concerne un système de soupape unidirectionnel (1), en particulier une soupape antiretour basse pression destinée à un dispositif de perfusion. Ce système se compose d'un corps (2, 3) comprenant une conduite d'alimentation (5) et une conduite d'évacuation (14), ainsi qu'au moins une garniture d'étanchéité (4) placée dans une chambre de pression (12). Selon l'invention, pour empêcher que de l'air ne pénètre dans le circuit de liquide de perfusion, l'écoulement est interrompu par une dépression statique au niveau de la conduite d'alimentation (5) et/ou de la conduite d'évacuation (14) ou par une surpression au niveau de la conduite d'évacuation (14), ce qui permet de garantir de manière sûre qu'un écoulement du liquide de perfusion n'est possible qu'en présence d'une surpression statique au niveau de la conduite d'alimentation.

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