Dual-chamber type prefilled syringe

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/19 (2006.01) A61M 5/28 (2006.01) A61M 5/31 (2006.01)

Patent

CA 2457016

A dual-chamber type prefilled syringe comprises a cylindrical member made of glass or the like, an interior area of which is partitioned into a front chamber and a rear chamber by a plurality of plug members. The respective chambers preliminarily and independently contain injection medicine and its dissolving solution or the like. An end plug member (13) is inserted and fitted into a side of a base end portion (4) of the cylindrical member (2). A middle plug member (14) is arranged between a front end portion (3) and the end plug member (13). The cylindrical member (2) has an inner surface between the front end portion (3) and the end plug member (14), projected outwards to provide a bypass (20) shaped like a groove. The bypass (20) has a length in a direction of an axis (19) of the cylindrical member (2), which is made longer than the middle plug member (14). The bypass (20) has an inner surface the end surface of which is situated on a side of an inlet (21) formed on the side of the base end portion (4) and uprises outwards by an angle (0) which is formed larger than 45 degrees with respect to the axis (19) of the cylindrical member (2). It is possible to reduce a phenomenon in which the dissolving solution or the like liquid agent splashes out of the bypass when communicating the front chamber with the rear chamber, which results in the possibility of effectively preventing the leakage of the liquid agent from a front end of an injection needle.

L'invention concerne une seringue préalablement remplie comportant deux chambres : l'intérieur d'un corps tubulaire en verre est divisé en une chambre avant et une chambre arrière par l'intermédiaire d'une pluralité de corps d'obturation, et l'injection et la solution correspondante y sont préalablement stockées. Un corps d'obturation terminal (13) est fixé au corps tubulaire (2) au niveau d'une partie terminale (4) de la base du tube, et des corps d'obturation intermédiaires (14) sont disposés entre une partie pointe (3) du tube et le corps d'obturation terminal (13). Une dérivation (20) convexe se présentant sous la forme d'un évidement est formée dans la surface interne du corps tubulaire (2) au niveau d'une partie située entre la partie pointe (3) du tube et le corps d'obturation terminal (13). Cette dérivation (20) présente, dans la direction de l'axe (19) du corps tubulaire, une longueur supérieure à celle du corps d'obturation intermédiaire (14), et l'angle vers l'extérieur ( theta ) donné à la paroi latérale terminale de l'entrée (21) de ladite dérivation (20), formée dans la surface interne de la partie terminale (4) du tube, est supérieur à 45 DEG par rapport à l'axe (19) du corps tubulaire. Ceci permet de réduire l'éjection d'un liquide tel qu'une solution logeant dans la dérivation lorsque la chambre avant et la chambre arrière sont mises en communication, et d'empêcher de manière satisfaisante une fuite de liquide situé dans la pointe de l'aiguille d'injection.

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