An injection system having a syringe body having a distal portion and a proximal portion, the syringe body defining a pumping chamber. A syringe plunger is located in the pumping chamber and is adapted for reciprocal motion within the pumping chamber. An actuating shaft is coupled to the syringe plunger and is movable through the syringe body to control movement of the plunger, the actuating shaft has a pivot member disposed at a distal portion thereof. A release actuator is disposed proximal to the syringe body, anda distal portion of the pivot member is adapted to project radially outwardly when contacted by the syringe plunger to form a releasable engagement with the syringe plunger when the actuating shaft and the pivot member are in an engagement position, and wherein the distal portion of the pivot member is adapted to release the actuating shaft upon engagement of a proximal portion of the pivot member with the release actuator.
