An insertion system having a base unit for placing on the body of a patient and an insertion device that can be coupled to the base unit, wherein the insertion device comprises an insertion needle holder for holding an insertion needle and a drive mechanism for displacing the insertion needle holder in a pricking direction. According to the invention, the insertion device comprises a locking mechanism causing locking of the drive mechanism in an active state and being set to an inactive state in which the locking is released by coupling the insertion device to the base unit.
