Endoprosthetic bone joint devices
AssigneeNational Research Development Corporation
InventorJohn Tracy Scales
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Abstract
An endoprosthetic bone joint device of ball-and-socket form has a socket component with a compound concave surface therein including a cup bounded by an annular trough, the co-operating ball normally seating in the cup but being alternatively seatable in the trough when dislocation would otherwise occur.
Claims9
An endoprosthetic bone joint device comprising two components respectively adapted for securement to different bones of the relevant joint, and respectively including male and female bearing parts in mutual articulatory engagement, the male part having a rounded convex bearing surface, the female part having a compound concave bearing surface including a cupped area bounded by an annular troughed area, and the curvature of said cupped area and the transverse curvature of said troughed area each being no greater than the curvature of said convex surface.
For use in an endoprosthetic bone joint device of ball-and-socket form, a socket component having a compound concave surface including a cupped area bounded by an annular troughed area.
Dependencies are inferred from the claim text.