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US 4,170,794 AGranted
Bone joint endoprosthesis
AssigneeRosenthal Technik AG
InventorsAnton Zeibig, John T. Scales
Life of this patent
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Abstract
A bone joint endoprosthesis comprises a spherical body of the joint with hole in it for receiving a shaft spigot; a shaft is embedded in bone; the shaft has a spigot which is received in the hole; a spreader, comprised of a material that swells when it is wetted, is wrapped over the spigot in the hole or is inside the spigot and the spreader expands radially in the hole or inside the spigot to secure the joint; shaping and profiling of the spigot and the wall of the hole for effective retention of the spreader are disclosed.
Claims18
A bone joint endoprosthesis, comprising:
- a body of the bone joint;
- said body having a side and having a hole extending into said body from said side thereof;
- said body hole being defined in said body by a side wall;
- a shaft for being received in a bone;
- said shaft having an end with a spigot defined thereon;
- said spigot being received in said body hole and being shaped to fit therein;
- a spreader in said body hole;
- said spreader being comprised of a material that swells in the presence of a fluid;
- said spreader being placed such that as it swells, it applies clamping forces to hold said body of the joint securely to said spigot.
6 more elements
Dependencies are inferred from the claim text.