Syringe with retractable needle
AssigneeSafe-T-Limited
InventorPeter Jeffrey
Life of this patent
Estimating the term…
Abstract
A syringe device for cartridged drugs has automatic needle retraction after cartridge contents expression. A drug cartridge is at least partially accommodated within a hollow piston actuator or carrier and is released for further retraction under bias thereinto by way of a piston rod. The piston rod serves to operate a piston contained in the drug cartridge and has deflectable locking arms that extend sideways into latching engagement with a holding formation of the piston actuator. Release of the arms by engagement with the open rear end of the cartridge permits retraction of needle and cartridge. Automatic needle insertion and cartridge contends discharge is also foreseen.
Claims16
A hollow needle applicator for cartridged drugs etc. including automatic needle retraction after cartridge contents expression, said applicator comprising a cartridge which is at least partially accommodated bodily within a hollow piston actuator or carrier and will be released for retraction under bias thereinto or further thereinto by way of a piston rod serving to operate contents discharge piston provision of said cartridge and said piston further having deflectable arms that extend sideways further than side walling of said cartridge and into temporary latching engagement with holding formation of said piston actuator or carrier until released by deflection of the arms by engagement with open rear end of said cartridge.
Dependencies are inferred from the claim text.