Flush syringe having anti-reflux stopper

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/315 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2539785

An I.V. flush syringe (20) assembly includes a barrel (22) having an inside surface (32) defining a chamber (33) for retaining fluid, an open proximal end (28) and a distal end (30) including a distal wall (31) with an elongate tip (36) extending distally therefrom having a passageway (38) therethrough in fluid communication with the chamber (33). A plunger (24) having an elongate body portion (25) and a stopper (54) slidably positioned in fluid-tight engagement with the inside surface (32) of the barrel (22) is provided. Anti- reflux structure for controlling stopper deflection when fluid has been delivered from the chamber (33) and the stopper (54) is in contact with the distal wall (31) is provided. The anti-reflux structure includes the stopper (54) having a conically shaped distal surface (59) and the inside surface (32) of the barrel (22) and the distal wall (31) being conically shaped (35) wherein the total included angle A of the inside surface (32) of the barrel (22) at the distal wall (31) is greater than the total included angle B of the distal surface (59) of the stopper (54) by at least 6~.

L'invention concerne un ensemble seringue de rinçage I.V. (20), lequel ensemble comprend un cylindre (22) pourvu d'une surface intérieure (32) définissant une chambre (33) de retenue de fluide, d'une extrémité proximale ouverte (28) et d'une extrémité distale (30) présentant une paroi distale (31) pourvue d'une pointe allongée (36), s'étendant en sens distal de ladite paroi et traversée par un passage (38) en communication fluidique avec la chambre (33). Cet ensemble comprend un piston (24) présentant un partie corps allongée (25) et un bouchon (54) positionné de façon à pouvoir glisser, en contact étanche avec la surface intérieure (32) du cylindre (22). Ledit ensemble comporte également une structure anti-reflux permettant de contrôler la déflexion du bouchon lorsque le fluide a été éjecté de la chambre (33) et le bouchon (54) est en contact avec la paroi distale (31). Cette structure anti-reflux comprend le bouchon (54) présentant une surface distale de forme conique (59), la surface intérieure (32) du cylindre (22) et la paroi distale (31) de forme conique (35), l'angle d'ouverture total (A) de la surface intérieure (32) du cylindre (22) au niveau de la paroi distale (31) étant supérieur à l'angle d'ouverture total (B) de la surface distale (59) du bouchon (54) d'au moins 6·.

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