Syringe plunger locking mechanism

摘要

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 between a position proximate to the proximal portion and the distal portion, the syringe plunger having first aperture disposed at a proximal portion thereof. An actuating shaft is capable of coupling to the plunger and is movable through the syringe body to control movement of the plunger, the actuating shaft has a movable first collet member and a movable second collet member disposed at a distal portion thereof. A release actuator is disposed at a proximal portion of the injection system, and
the distal portions of the movable collet members are adapted to project radially inwardly when contacted by a sidewall of the first aperture to form a releasable engagement with the syringe plunger, and
the distal portions of the movable collet members are adapted to project radially inwardly to disengage the syringe plunger from the actuating shaft when a proximal portion of the movable collet members slidably contact the release actuator and move radially inwardly.