Modular shoulder prosthesis
First Claim
1. A prosthesis of the upper end of the humerus comprising, a stem which is anchored in a humeral canal, the stem having an outer bearing face, the prosthesis also including a single semi-spherical cap having a geometrical axis and a base and adapted to cooperate with a socket of a shoulder, the prosthesis being provided with a spacer in the form of a wedge having a first face oriented toward the bearing face of the stem and a second face oriented toward the base of the cap, the spacer being adapted to vary the distance of the base of the cap with respect to the bearing face of the stem, securing means engageable with both the cap and the spacer, the securing means being selectively engageable to retain the cap at any one of a plurality of angular positions relative to the spacer about a second geometrical axis which is eccentric with respect to the geometrical axis of the cap to thereby allow a selectived alignment of the cap with respect to the spacer and stem.
3 Assignments
0 Petitions
Accused Products
Abstract
A modular humeral prosthesis including a humeral stem for anchoring which stem includes a bearing face, a spacer in the form of a wedge having a first face which fits on the bearing face of the stem and a second face, and a humeral semi-spherical cap having a base which is fixed with respect to the second face of the spacer. The manner in which the cap and spacer are connected relative to the bearing face of the stem permits the cap to be adjusted angularly in position about an axis which is off-set from the axis of symmetry of the cap. Elements are provided to lock the cap to the spacer and the spacer to the stem.
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Citations
17 Claims
- 1. A prosthesis of the upper end of the humerus comprising, a stem which is anchored in a humeral canal, the stem having an outer bearing face, the prosthesis also including a single semi-spherical cap having a geometrical axis and a base and adapted to cooperate with a socket of a shoulder, the prosthesis being provided with a spacer in the form of a wedge having a first face oriented toward the bearing face of the stem and a second face oriented toward the base of the cap, the spacer being adapted to vary the distance of the base of the cap with respect to the bearing face of the stem, securing means engageable with both the cap and the spacer, the securing means being selectively engageable to retain the cap at any one of a plurality of angular positions relative to the spacer about a second geometrical axis which is eccentric with respect to the geometrical axis of the cap to thereby allow a selectived alignment of the cap with respect to the spacer and stem.
Specification