The invention relates toan inserter for an intrauterine system,comprising a handle (3) having alongitudinal opening (8) at its first end, saidopening (8) having a longitudinal axisparallel to the longitudinal axis of theinserter, a first end (8a) and a second end(8b), a movable slider (5) arranged insaid longitudinal opening (8) and havinga first end (5a) and a second end (5b), aplunger (2) attached to the handle (3), aninsertion tube (6) arranged around theplunger (2) having a first end and asecond end, with its second end attached tothe slider (5), wherein the inserter furthercomprises locking means for reversiblylocking the intrauterine system inrelation to the plunger (2) via a removalstring of the intrauterine system, saidlocking means being controllable by theslider (5) and/or the insertion tube (6).
