A syringe and method for use which may be selectively operated between a free position and a locked position. A triggering device configured with a trigger attached to the plunger of the syringe is employed. The triggering device includes a set of threads located on the plunger and a corresponding set...http://www.google.com/patents/US5057078?utm_source=gb-gplus-sharePatent US5057078 - Locking syringe
