Adaptable stem for endoprosthesis
AssigneeAO-Forschungsinstitut Davos
InventorsKaj Klaue, Jean L. Chareire
Life of this patent
Estimating the term…
Abstract
A stem for an endoprosthesis to be anchored in a bone (3) comprises a chamber (4) which surrounds the stem periprosthetically, which can be sealed in a pressure tight manner and which can be expanded with a thermoplastic or thermostable filling material (16). The rigid stem (1) of the endoprosthesis is connected mechanically to the bone (3) via the expandable chamber (4) by means of the filling material (16). The filling material is isolated from the bone (3), however, by the wall of the pressure-tight chamber (4). This makes it possible to ensure that the outer wall of the chamber (4) adjacent to the bone is extremely biocompatible.
Claims21
A stem assembly for an endoprosthesis to be anchored in a bone comprising a stem;
- means defining at least one expansible chamber (4) having a first wall sealed to said stem in a pressure-tight manner and a second wall at least partly enclosing said stem (1) and being expandable to contact an interior surface of said bone;
- a viscous liquid filler;
- and
- valve means for selectively introducing said filler into said chamber for expanding and substantially permanently pressurizing said chamber with hydrostatic pressure.
Dependencies are inferred from the claim text.