Multi-chamber, sequential dose dispensing syringe

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/24 (2006.01)

Patent

CA 2565531

A valve assembly is disclosed which partitions a syringe into proximal and distal chambers to provide a multi-chamber, sequentially dispensing syringe apparatus. The valve assembly has a valved stopper, an impact sensor which opens the valve upon impact between the valve assembly and internal distal end of the syringe and a gas separator which separates liquid from from gas disposed in the proximal chamber to assure gas is not delivered therefrom. The valve assembly is in fluid communicating with an associated syringe plunger and is displaced thereby. The valve assembly may be made from two parts. One part, a valved stopper, may be molded from rubber based material used in syringe plunger stoppers. The second part, the valve actuator, may be injection molded.

L'invention concerne un ensemble valve divisant une seringue en chambres proximale et distale et permettant d'obtenir une seringue de distribution de doses successives à chambres multiples. Cet ensemble valve comporte une butée de valve, un détecteur de contact qui ouvre la valve lors d'un contact entre l'ensemble valve et l'extrémité distale intérieure de la seringue, ainsi qu'un séparateur de gaz qui sépare le liquide du gaz disposé dans la chambre proximale de façon à empêcher la distribution du gaz à partir de celle-ci. Ledit ensemble valve est en communication fluidique avec un piston de seringue associé et est déplacé par ce dernier. L'ensemble valve peut être constitué de deux pièces. Une pièce, une butée de valve, peut être moulée à partir d'une matière à base de caoutchouc utilisée dans les butées de pistons de seringues. La seconde pièce, l'actionneur de valve, peut être moulée par injection.

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