主权项 |
1. An implantable medical device for implantation in a hip joint of a human patient, the hip joint comprising the caput femur shaped like a ball, being connected to the collum femur and being the upper extremity of the femoral bone, the collum femur and caput femur having a longitudinal axial distribution with a longitudinal caput femur centre axis reaching from the collum femur, in the centre of the collum femur and caput femur and towards the acetabulum, the acetabulum is a bowl shaped section of the pelvic bone, with an opening towards the caput femur, the acetabulum having an acetabulum centre axis reaching from the centre of the bottom of the bowl towards the centre of the opening and the normal position of the caput femur, wherein the caput femur centre axis is aligned with the acetabulum centre axis in a special centered position, when the caput femur is aligned, centered and symmetrical in the acetabulum, the caput femur and acetabulum each having a hip joint carrying surface, facing each other and contacting each other, the hip joint carrying surfaces, carrying weight in the hip joint, wherein said medical device comprises:
at least one artificial hip joint surface adapted to replace at least the surface of at least one of the caput femur and the acetabulum, and a positioning hole having at least one opening, said hole being adapted to receive a positioning shaft adapted to be fixated to at least one of the femoral bone and the pelvic bone, wherein the hole is adapted to at least partly surround the shaft, for positioning said at least one artificial hip joint surface in a desired position in the hip joint. |