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US 4,031,570 AGranted
Prosthetic acetabulum
AssigneeSulzer Brothers Limited
InventorOtto Frey
Life of this patent
Estimating the term…
Abstract
The concave articular surface of the prosthetic acetabulum which receives a spherical joint head is formed with a groove which extends about the surface and joint head. This groove serves to distribute the lubricant within the joint during loading and unloading of the joint.
Claims3
A hip joint endoprosthesis comprising
- a joint head with a spherical surface;
- and
- a prosthetic acetabulum having a concave articular surface receiving said joint head and at least one groove within said surface extending peripherally of said surface and said joint head, said articular surface being a surface of rotation having as a generatrix a quadrant arc with a radius corresponding to the radius of said joint head spherical surface but a center of curvature spaced a predetermined distance from the rotational axis around which said quadrant arc is rotated for generating said surface of rotation of said acetabulum.
Dependencies are inferred from the claim text.