Method for the production of a modeling system (1) for aneurysms involving the steps:

• Local heating of a first hollow body which is suited for conducting liquid and is comprised, at least in one or more partial areas, of a flexible, thermoplastically deformable material. The local heating is effected on at least one of the partial areas until the thermoplastically deformable material softens. The invention also involves subjecting this first hollow body to the action of pressure that is great enough to cause a deformation at the heated location, whereby the size of the deformation is determined by the duration of the pressure applied and/or by the intensity of the pressure applied.