Syringe assembly having disabling mechanism

A syringe assembly having a passive disabling structure includes a barrel 102 and a plunger rod (108) assembly. The plunger rod assembly includes a stop (128) connected by a locking element 130 to the plunger rod and the guide. The number of strokes of the syringe assembly syringe plunger barrel before being locked in the stop is to disable (stroke) is determined by the number of catches in the stationary portion and a plunger rod to engage the locking mechanism. Before the end of the final (delivery) administration, and any attempt trying to pull the locking element engages the plunger rod from the barrel of the barrel and stop the syringe barrel to prevent further use of the wealth it will be trapped.