Reinforced locking syringe

摘要

A reinforced locking syringe (10) may be selectively operable in either of a freely reciprocating or a restricted, threaded mode. A trigger (22) attached to the plunger (14) engages internal threads (38) on the interior of the barrel (12) of the syringe (10) with external threads (56) located on the plunger (14) On a spine (53). A handle (20) is affixed to the plunger (14), and a retraction bar (50) is rigidly secured to the spine (53). The threads (56) on the plunger (14) may be retracted from engagement with the threads (38) on the barrel (12), thereby placing the syringe (10) in its freely reciprocating mode. The trigger (22), which is spring biased to engage the external (56) and internal threads (38), employs a plurality of ramps (52) and channels (54) disposed at approximately the same angle to the longitudinal axes of the plunger (14) and barrel (12) as are the threads. A reinforcing sleeve (101) surrounding the barrel (12) prevents the deformation of the syringe (10) when high pressures are exerted within the syringe (10).