Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1999-06-01
2001-04-10
Philogene, Pedro (Department: 3732)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
C623S023480, C623S016110, C623S018110, C623S022400
Reexamination Certificate
active
06214053
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a prosthesis with a centraliser and centraliser for use therewith.
2. Description of the Prior Art
It is known to provide the stem of at femoral prosthesis with a centraliser at or towards the distal tip of its stem. There are however difficulties in guiding the proximal end of the stem in the bone cavity to which it is to be attached by cement and the present invention is intended to overcome the difficulties involved.
SUMMARY OF THE INVENTION
According to the present invention a prosthesis is provided with a device for guiding its stem in a bone cavity and which is to be attached by cement, said guiding device comprising a sleeve having an opening to receive said stem and locate it on said stem at a position at or towards its proximal end and which is dimensioned and adapted to locate the stem in a predetermined position within the cross-sectional area of the bore of the bone cavity.
In one embodiment according to the invention the sleeve extends over only a part of the length of the stem spaced away from the distal end thereof.
In another construction the sleeve can be arranged to extend over the whole length of the stem.
The outer shape of the sleeve can take various forms and in a convenient construction the sleeve has a wall thickness which is increased towards its proximal end to provide an outwardly projecting balcony.
The outer shape of the sleeve can be formed with one or more concave surfaces the proximal end or ends of which form said balcony.
Alternatively the outer shape of the sleeve can be formed with one or more substantially flat surfaces the proximal ends of which form said balcony.
In one preferred construction the sleeve has an outer shape which is conical or frusto-conical and thus it has only one outer surface which provides the concave surface referred to above.
In another construction the sleeve can have an outer shape which includes three or more flat surfaces which are curved inwardly from its proximal end. With such a construction the sleeve can have a cross-sectional outer shape which is triangular, square or rectangular.
When a sleeve extends over the whole length of the stem the distal end of the sleeve can enclose the stem and be provided with a cup into which the distal end of the stem can subsequently sink and said cup can be arranged to extend up to half the length of the stem from its distal end.
If desired the sleeve can be provided with means for distally centralising the stem in the bone canal.
In another construction the sleeve can be arranged to cover the stem from a point adjacent the proximal end of the bone when the stem is inserted to a point spaced away from the distal tip.
The sleeve can be preformed and subsequently fitted to the stem.
The sleeve can be made from any convenient material, for example polymethylmethacrylate (PMMA).
The invention also includes a device for guiding the proximal end of the stem of a prosthesis in a bone cavity and which is to be attached by cement, and comprising a sleeve having an opening to receive said stem and adapted to locate on said stem at a position at or towards its proximal end, and which is dimensioned to engage the wall of the bone cavity at or towards the proximal end thereof to guide the proximal end of the stem in place therein.
This device can have all the features referred to above.
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Gie Graham Allan
Ling Robin Sydney Mackwood
Storer John Andrew
Timperley Andrew John
Benoist Girard SAS
Lerner David Littenberg Krumholz & Mentlik LLP
Philogene Pedro
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