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AssigneeUnitract Syringe Pty Ltd
InventorsCraig Stephen Thorley, Joseph Hermes Kaal, Richard Sokolov, Ernesto Hueso, Huw Wallis, Scott Chad, Christopher Dunn
Estimating the term…
A plunger, a needle assembly and a retractable syringe comprising same are provided. The plunger comprises a plunger member and a plunger outer having a lock spring that prevents or impedes movement of the plunger member after needle retraction. The plunger further comprises another locking member for engaging the barrel to prevent or impede further movement of the plunger outer after delivery of fluid contents. The plunger member has a plunger seal which engages a retractable needle of the needle assembly for retraction. The retractable needle comprises a cannula and needle body with a plurality of fluid channels that co-operate with a fluid conduit of the plunger seal to efficiently direct fluid to the cannula. A needle retainer comprises a plurality of barbed arms releasably coupled to the needle body, whereby an ejector with tabs facilitates release of the retractable needle from the needle retainer to allow compressed spring-driven retraction.
A plunger for a retractable syringe comprising a barrel and a retractable needle, said barrel having an inner wall, the retractable needle having a cannula extending through a needle body, the needle body having one or more fluid channels, said plunger comprising
A method of making a retractable syringe including the step of inserting a needle retainer into a barrel of the retractable syringe, the needle retainer comprising a plurality of centering bosses that facilitate self-centering of the needle retainer in the barrel, providing a retractable needle having a cannula extending through a needle body, the needle body having one or more fluid channels, inserting the retractable needle into the barrel, providing a plunger including a plunger outer, one or more locking members, and a plunger member, the plunger member including a unitary plunger seal that includes a needle-engaging recess and one or more fluid conduits in said needle-engaging recess that are capable of directing fluid to said one or more fluid channels in said retractable needle, a first of said one or more locking members being mounted to the plunger outer and capable of preventing or impeding further movement of said plunger member relative to said plunger outer and/or said barrel after needle retraction, and inserting at least a portion of the plunger into the barrel so that the unitary plunger seal seals against an inner wall of said barrel.
Dependencies are inferred from the claim text.