System for inserting a self-expandable occluder into a patient and for releasing the occluder in the left atrial appendage of the patient, the system including an insertion unit which has a drive unit and an insertion catheter having an outer tube and an inner tube extending through the outer tube, wherein a proximal end region of the occluder is movement-coupled to the outer tube, and wherein a distal end region of the occluder is movement-coupled to the inner tube.