Universal modular prosthesis stem extension
AssigneeAlvarado Orthopedic Research, Inc.
InventorsThomas D. Petersen, Douglas W. Stuart
Life of this patent
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Abstract
Disclosed is an improved universal modular prosthetic stem extension which may be installed on a prosthesis in a multiplicity of differing orientations to allow adaptation to a multiplicity of differing patient conditions. The stem includes a coupling mechanism allowing the stem to be rotated to any one of a multiplicity of rotative positions with respect to a prosthetic base, whereupon the stem may be tightened and fixed in position at a desired such orientation. The inventive stem extension is disclosed in conjunction with embodiments of distal femoral, proximal tibial, and proximal femoral prostheses.
Claims29
A modular prosthesis system comprising:
- a) a prosthetic head having an undersurface;
- b) head mounting means on said undersurface;
- c) a stem extension having stem mounting means for mounting said stem extension to said head mounting means in any one of a plurality of orientations with respect thereto;
- d) said stem extension having a stem portion, connected to said stem mounting means and defining an obtuse angular relationship therebetween.
A method of performing surgery including the steps of:
- (a) providing a modular prosthesis system comprising:
- (i) a prosthetic head having an undersurface;
- (ii) head mounting means on said undersurface;
- (iii) a stem extension having stem mounting means for mounting and locking said stem extension to said head mounting means in any one of a plurality of orientations with respect thereto;
- (iv) said stem extension having a stem portion connected to said stem mounting means and defining an obtuse angular relationship therebetween;
- (v) said prosthetic head and stem extension combining to comprise a prosthesis;
- (b) surgically preparing a bone to accept said prosthetic head and stem extension;
- (c) adjusting the orientation of said stem extension with respect to said prosthetic head to render said prosthesis compatible with said surgically prepared bone;
- (d) locking said orientation between said stem extension and said prosthetic head;
- and
- (e) surgically fastening said prosthesis to said bone.
Dependencies are inferred from the claim text.