Corneal transplantation is the most frequently performed and most successful organ transplantion in medicine. Each layer of the cornea can develop its own disease. For example, the inner layer of the cornea (endothelium) can become cloudy after cataract surgery or in the case of Fuchs' corneal endothelial dystrophy. The pathological inner layer – consisting of the Descement membrane and endothelium – is replaced within an operation called DMEK (Descemet Membrane Endothelial Keratoplasty). During the process the layer is introduced into the front chamber of the patient’s eye in a coiled status by means of a so-called DMEK-shooter. A problem is that the Descemet membrane has the tendency to automatically wind itself up to form a single-axis winding. The membrane must therefore be unwound manually by the surgeon after insertion into the front chamber of the eye, partly with the aid of further instruments and/or by air bubble or pressure on the cornea. This surgical technique is time-consuming, can damage the graft and is stressful for the eye. Ophthalmologists at the University Hospital of Cologne have developed DMEK-shooters that significantly make the operation easier by unrolling the membrane in the eye faster, safer and more standardized already during the process of implantation. Tubes used so far have a cylindrical form with a round profile. An oval profile and a novel shape of the inner architecture characterize the inventive shooters. This shape allows uncoiling of the Descemet Membrane already during release from the shooter. Thereby, the number of subsequent surgical steps and the likelihood of complications is reduced and consequently the success rate of this surgical method is increased. In addition, the ophthalmologic surgeons have developed a device for completely contactless and easy preparation and transfer of the transplant into a storage box or injection cartridge.