A system for inserting a compressed, self-expandable stent(2) through a sluice (14) disposed on a blood vessel (12)into the blood vessel (12) and for releasing the stent (2)in the blood vessel (12), the system comprising a sluice(14) and a catheter (4), which comprises an inner tube (6),a middle tube (8) and an outer tube (10), wherein the stent(2) is disposed in a distal end portion of the catheter (4)between the inner tube (6) and the outer tube (10) and themiddle tube (8) ends distally at the proximal end of thestent (2), and with an actuating unit (16) having a driveunit (18) provided in the proximal region of the catheter(4) for releasing the stent (2), characterised in that aconnecting means (30) is provided between the drive unit(18) and the sluice (14), wherein the drive unit (18) iscooperating with the middle tube (8) and the connectingmeans (30) in such a way, that when the drive unit (18) isoperated the middle tube (8) is displaced in the distaldirection (39) and the actuating unit (16) together withthe outer tube (10) attached thereto is displaced in theproximal direction (36), and wherein the inner tube (6) iscooperating with the middle tube (8) and/or the connectingmeans (30) in such a way that the inner tube (6) isdisplaced at least to some extent relative to the actuatingunit (16).
