a device for implanting endoprostheses has a tubular outer body and an elongated core element placed inside of the outer body . to operate the device , both the core element and the tubular body are provided with handles at their proximal ends . in order to produce a form - locking connection between the endoprosthesis and the core element , the core element exhibits a region in which is impressed a stamping corresponding to the inner form of the endoprosthesis . as a result , there are a great number of form - locking meshing sites between the enclosed , folded endoprosthesis and the core element . a device with this type of design permits a partially released endoprostheses to be folded back up in a radially contracted state again by pushing the tubular body forward so that the endoprosthesis may be repositioned . in addition , sure and reliable operation is achieved by this type of stamping of the core element .