Drainage unit with controlled negativity relief feature

Details Drainage unit with controlled negativity relief feature Drainage unit with controlled negativity relief feature

A - Human Necessities

61

M

A61M 1/00 (2006.01) A61M 1/36 (2006.01)

Patent

CA 2223744

The present invention provides for an improved airflow sensitive float valve (38) interposed between the collection chamber (15) and one arm of the water seal chamber (16) for allowing the patient to draw as much vacuum pressure as is required during deep inspiration. The float valve also functions to provide for an automatic controlled release of excess negtive pressure in the collection chamber during either continuous auto-transfusion or when there is a low airflow rate condition present. By tailoring a specific amount of water to a given size chamber, the water column inside the water seal chamber is allowed to momentarily engage the floating mechanism before the water seal chamber is emptied of water, and a column of air is subsequently forced through the water column towards the momentarily sealed valve.

L'invention porte sur une soupape flottante (38) sensible aux flux d'air interposée entre une chambre de collecte (15) et l'un des bras de la chambre à siphon (16) de manière à permettre au patient de créer par aspiration une dépression aussi forte qu'au cours d'une inspiration profonde. La soupape flottante régule automatiquement l'excès de pression négative dans la chambre de collecte soit lors d'une autotransfusion continue, soit en cas de débit d'air insuffisant. En fixant une quantité spécifique d'eau pour une chambre de taille donnée, on permet à la colonne d'eau à l'intérieur de la chambre d'obturation hydraulique de venir en contact momentané avec le mécanisme flottant avant que la chambre ne se soit vidée d'eau, ce après quoi une colonne d'air est envoyée de manière forcée dans la colonne d'eau en direction de la soupape momentanément fermée.

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