Improved check valve for fluid injector

A - Human Necessities – 61 – C

Patent

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Details

A61C 17/06 (2006.01) A61C 1/16 (2006.01) F16K 15/00 (2006.01)

Patent

CA 2687624

A backflow-prevention system that substantially prevents contaminant backflow at a treatment site. The system includes a fluid ejector tube for insertion into the patient's mouth and for removal of fluids when a threshold vacuum pressure is applied. A backflow prevention device receives fluid from the fluid ejector tube and includes an internally positioned valve. The valve prevents contaminant backflow upon release of the vacuum pressure or a reduction in the vacuum pressure. Upon application of vacuum pressure, the valve moves into an open position to allow fluid flow away from the treatment site. The system can also include a disposable cover member that extends over at least portions of the fluid ejector tip, the backflow prevention device, and other features such as an ON/OFF valve assembly of a suction system. Similar principles of backflow prevention can be applied to fluid dispensers (e.g., liquid soap dispensers) wherein backflow of the fluid into the fluid storage container is undesirable.

L'invention porte sur un système anti-reflux qui empêche sensiblement le reflux de contaminants sur un site de traitement. Le système de l'invention comprend un tube éjecteur de liquide destiné à être inséré dans la bouche d'un patient pour en évacuer les liquides lorsqu'une pression négative seuil est appliquée. Un dispositif anti-reflux, qui reçoit un liquide en provenance du tube éjecteur de liquide, comprend un clapet interne qui empêche les contaminants de refluer lorsque la pression négative est relâchée ou réduite. Lors de l'application de la pression négative, le clapet se déplace en position ouverte afin de permettre au liquide de s'écouler depuis le site de traitement. Le système peut également comprendre un élément couvercle jetable qui s'étend par dessus des parties au moins de la pointe de l'éjecteur de liquide, du dispositif anti-reflux et d'autres organes tels qu'un ensemble soupape marche/arrêt d'un système d'aspiration. On peut appliquer des principes anti-reflux similaires à des distributeurs de liquides (p.ex. des distributeurs de savon liquide) dans lesquels on souhaite empêcher le reflux du liquide dans le récipient de stockage de liquide.

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