Exchange needle retractable safety syringe

Details Exchange needle retractable safety syringe Exchange needle retractable safety syringe

A - Human Necessities

61

M

A61M 5/50 (2006.01)

Patent

CA 2586705

A safety syringe comprising a syringe barrel (12), a plunger (13), a needle (14), a needle hub (15) integral with the needle, a needle gland (16) to accommodate the needle and hub, and a needle cap (19) to protect the needle prior to use. The plunger has engagement means (25, 36) located on its end to engage with the needle hub in order to retract the needle from the gland and into the syringe barrel after the syringe has been used. The plunger is provided with a threaded split bush (28), which has a multi start thread. When the plunger is fully retracted with the needle attached, the plunger has one or more lugs (31) that come into contact with the threaded split bush so that the plunger is thereby locked. Hence the needle is locked in the barrel. The plunger may be snapped off retaining the needle safely within the syringe barrel.

L~invention concerne une seringue de sécurité comprenant un corps de seringue (12), un piston (13), une aiguille (14), une embase d~aiguille (15) faisant partie intégrante de l~aiguille, un joint d~aiguille (16) destiné à recevoir l~aiguille et l~embase, et un capuchon d~aiguille (19) destiné à protéger l~aiguille avant utilisation. Le piston comprend des moyens de mise en prise (25, 36) situés sur son extrémité et destinés à se mettre en prise avec l~embase de l~aiguille afin de rentrer l~aiguille à partir du joint et dans le corps de la seringue après que la seringue ait été utilisée. Le piston est muni d~une douille de serrage filetée (28) qui comporte des filets multiples. Lorsque le piston est entièrement rétracté, l~aiguille étant attachée, le piston comporte un ou plusieurs ergots (31) qui viennent en contact avec la douille de serrage filetée de sorte que le piston est ainsi verrouillé. L~aiguille est donc verrouillée dans le corps. Le piston peut être enlevé en laissant de manière sûre l~aiguille à l~intérieur du corps de la seringue.

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