System for determining deviations of the predetermined position of an invisible feature due to deformations of implants

摘要

System for determining deviations of the predetermined expected position of the real position of a located inside the body and thus visually inaccessible, so invisible feature (21) due to material deformation in implants, characterized in that it comprises a target device (1) consisting from at least two parts with different, in the image clearly distinguishable Formausprägung (11) and (12), the surface at a first defined distance, preferably connected in parallel, and stable at a second defined distance with the support (2) of the visually is not accessible, so invisible feature (21) is connected and is aligned with this feature (21) in the undeformed implant, that this target device is mounted after insertion of the implant in the predefined expected position of the implant and an X-ray image using C-arm Location of the destination facility and the location to be located visually inaccessible, ie invisible feature (21) in its real position, preferably in the image center, detects that from the image of the X-ray image from the position of the geometric shapes of the two parts of the target device, the deviation of the expected position of the visually inaccessible, Thus, invisible feature of the real situation is determined and that the determined dimensional deviation for correcting the route guidance for performing the locking of the material-deformed implant is used.