Special features of prostheses classified in groups [CPC: A61F2/00] - [CPC: A61F2/26] or [CPC: A61F2/82] or [CPC: A61F9/00] or [CPC: A61F11/00] or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in electric properties, e.g. in electrical conductivity, in galvanic properties differing in electromagnetical properties