Abstract: A catheter system includes an outer catheter having an outer catheter shaft defining an outer catheter lumen. At least one inner member is arranged within the lumen. The at least one inner member is relatively movable to the outer catheter in an unrestricted moving state. An axial movement restriction device includes an actuation mechanism and a locking mechanism. The axial movement restriction device can restrict an axial movement of the at least one inner member in a restricted moving state compared to the axial movement in the unrestricted moving state.