The present invention relates to an apparatus (100) for folding or unfolding at least one medical implant (300) by using at least one tension thread (11, 11′), wherein the apparatus (100) includes a shaft (1) including a reception area for receiving the implant (300), a tensioning device for altering a shape of the foldable and/or unfoldable implant (300) by the tension thread (11, 11′), and a clamping mechanism for clamping at least one section of at least one of the tension threads (11, 11′). The present invention further relates to a set and a method.
