A medical implant has a compressed and expanded state with an open-worked, preferably hollow-cylindrical main structure composed of a plurality of crosspieces, of which at least two are interconnected in each case at node elements. In the compressed state, even with complicated movements of the implant, for example when inserted into a vessel, at least one first barrier element is provided at each of a plurality of first node elements and at least one second barrier element is provided at each of a plurality of second node elements in each case adjacent to a respective first node element, such that a first barrier element and a respective adjacent second barrier element in each case lock together as the implant transitions from the expanded state into the compressed state, preferably during crimping, and thus inhibit the transition back in to the expanded state, so the barrier opposes a force in the circumferential direction and opposes a force in the radial direction. A system formed of an implant of this type and a catheter with a balloon and also a method for making such an implant and a system of this type are also described.
