A catheter including at least a cage having a distal and a proximal sleeve and filaments running between the sleeves and an actuation portion comprises a base part that is movement-coupled with the inner catheter in the axial direction and an actuation part that can be moved relative to the base part in the axial direction and is guided in or on the base part, the proximal end of the outer catheter having the actuation part and the distal end of the outer catheter having the proximal sleeve are movement-coupled in the axial direction such that when moving the actuation part away from the base part, the proximal sleeve is moved toward the distal sleeve, the actuation part comprises an inlet for irrigation fluid to be transferred to bearing points of the conveying element, and the base part has an outlet for irrigation fluid coming from the bearing points.
