Extendable auto retractable medical syringe

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/50 (2006.01) A61M 5/32 (2006.01)

Patent

CA 2590608

An auto retractable safety syringe (11) is disclosed. The syringe has barrel (12) which has a hollow plunger (13) located therein. The plunger has piston means (39) associated therewith so as to be sealingly slideable within the barrel. The syringe further has a needle cartridge assembly (14) located in the barrel, the needle cartridge assembly comprising a needle (20), needle hub (21), and a housing (15, 16) therefor. The needle cartridge assembly is initially releasably engaged on the end of the plunger in a retracted state within the barrel prior to use, and is movable to and engageable with the end (25) of the barrel where the needle extends therefrom in an in-use position for performing an injection. During this time the plunger is withdrawn from engagement with the cartridge, so as to function in known manner as a plunger for taking fluid into the barrel and causing it to be injected into a patient. Subsequent to completion of the injection, the plunger is depressed further to cause the cartridge to auto retract the needle such that it is caused to retract into the hollow plunger.

La présente invention a trait à une seringue de sûreté auto-rétractable (11). La seringue comporte un cylindre (12) qui renferme un piston creux (13). Le piston a des moyens de piston (39) qui y sont associés en vue de son coulissement étanche à l'intérieur du cylindre. La seringue comporte également un ensemble de cartouche d'aiguille (14) situé dans le cylindre, l'ensemble de cartouche d'aiguille comportant une aiguille (20), un embout d'aiguille (21), et un logement (15, 16) correspondant. L'ensemble de cartouche d'aiguille est au départ engagé de manière amovible sur l'extrémité du piston dans un état escamoté à l'intérieur du cylindre préalablement à l'utilisation, et est mobile pour y être engagé vers l'extrémité (25) du cylindre à partir de laquelle l'aiguille s'étend dans une position d'utilisation pour la réalisation d'une injection. Simultanément, le piston est libéré de la cartouche, afin de fonctionner normalement comme un piston pour le prélèvement de fluide dans le cylindre et son injection dans un patient. Lorsque l'injection est achevée, le piston est enfoncé davantage pour entraîner l'auto-rétractation de l'aiguille de manière à l'escamoter dans le piston creux.

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