Prefilled retractable syringe, plunger and needle assembly

摘要

A retractable syringe, plunger and releasable needle assembly including a retractable needle, a needle seal, a retaining member and an ejector member. The retaining member has a mating surface for mounting to a complementary mating surface of an interior wall of a syringe barrel. The plunger comprises a plunger outer, a plunger rod frangibly connected to a controlling member, a spring and a unitary plunger seal capable of engaging the retractable needle, wherein the plunger rod, plunger outer and the controlling member co-operate to releasably maintain the spring in an initially compressed state. After delivery of fluid contents of the syringe, the plunger forces the ejector member to release the retractable needle from the retaining member. Decompression of the spring at the end of depression of the plunger facilitates retraction of the retractable needle when engaged with the unitary plunger seal.

主权项

1. A releasable needle retaining system mountable to a syringe barrel, comprising:
a retractable needle that comprises a needle body having a base and a cannula; a needle seal that seals against the inside wall of the barrel and releasably engages the base of the retractable needle prior to retraction; and a retaining member that comprises a cylindrical body comprising a mating surface complementary to a mating surface of an interior wall of said barrel, said retaining member comprising fingers that, in use, project proximally with respect to a user and are capable of initially retaining said retractable needle at a needle end of said barrel until said base of said retractable needle is engaged by a plunger to facilitate retraction of said retractable needle.