An endomedullary nail for the treatment of proximal femur fractures, comprising an elongate body having a proximal portion and a distal portion. The neck covering device includes a self-expanding stent for supporting and retaining a self-expanding neck cover which seals the neck of the aneurysm. A developer in the pumping path is pumped up by the developer pumping section, so that a part of the developer is moved to a side of the first conveying path while another part of the developer is moved to a side of the second conveying path. An apparatus includes an isosurface former that forms an isosurface within a volume encompassing an object, and an isosurface shaper that adjusts the isosurface relative to the surface of the object and prunes the isosurface to obtain the object proxy. The method comprises comparing, when a handover of a mobile station to a base station is intended, decision criteria of the intended handover with decision criteria of previous handovers of the mobile station to that base station, and deciding on allowing or preventing the intended handover based on the result of the comparison.