The device has a body with a tail portion, a wheel for rotating a screw, a screw, a slider with threaded elements and a scale for identifying the position of the slider and a resilient tensioning member with elastic locking members disposed thereon, a wedge piece consisting of two elements, a spring and a lock button, arranged inside the body. When preparing the device for use, the coronary stent is first inserted on a delivery system into the device； the coronary stent is then manually maneuvered on the delivery system to the injured site of the coronary artery, the delivery system is locked in the device, and the stent is positioned in the coronary artery using the rotation wheel.
