extending slot so that the rear part of the housing is rotatable, a runner with a cap screwed on the extending slot so that the rear part of the housing is rotatable, a runner with a cap screwed on the runner thread, a collet with hooks accommodated in the runner so at to be rotatable around its axis, a retainer with ears, wherein the runner cap is arranged inside the retainer. When the device is prepared for use, a coronary stent: carried by a delivery system is first progressively inserted inside the device and then the coronary stent carried by the delivery system is advanced manually to an affected area of a coronary artery, the delivery system is fixed Inside the device and is positioned within a coronary artery by means of rotating the rear part of the housing.