Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
1999-10-15
2001-04-17
Mancene, Gene (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
Reexamination Certificate
active
06217583
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a prosthetic implant cement deflector for use in prosthetic surgery when employing a cannulated phantom prosthesis and/or surgical prosthesis utilising a guide wire and provided with an insert portion.
2. Description of the Prior Art
U.S. Pat. No. 5,788,704 shows a method and apparatus for implanting a prosthesis. The invention relates to a method of guaranteeing the position and thickness of an adequate cement mantle around a cemented implant and shows the use of a phantom or trial component having a tapered insert portion. The phantom component is first inserted into a cavity which has been filled with bone chips which are compressed. A lining of cement is now applied to the cavity and a cannulated phantom is introduced into the opening.
The phantom is subsequently withdrawn from the cavity, the cement cavity inspected and the surgical prosthesis is finally implanted.
It has been found that using this technique there can sometimes be difficulties with the passage of cement into the bore of the phantom within the gap between the phantom and the guide wire. The present invention is intended to provide means for preventing this happening.
SUMMARY OF THE INVENTION
According to the present invention a prosthetic implant cement deflector for use in prosthetic surgery when employing a cannulated phantom prosthesis and/or prosthesis which has an insert portion and a bore adapted to receive a guide wire, comprising a cement deflector element adapted to slide on the guide wire and which can act to seal the interface between the guide wire and the surface of the distal end of the bore.
In a preferred embodiment the deflector element has an external profile which is greater than the external dimensions of the phantom or prosthesis with which it is to be used.
Thus, when in use, the deflection element is fitted to the guide wire before the phantom or surgical prosthesis and pushed down the wire in front of it. As the prosthesis approaches the distal end of the lined cavity the cement deflector pushes the cement aside and forms a recess at the distal end when the prosthesis is in its inserted position.
If desired, the cement of the deflector could also be used with the direct implantation of a surgical prosthesis along a guide wire, again being employed to prevent cement entering the bore and, if desired, to provide a void to allow the prosthesis to sink further. Preferably the element is adapted to be secured to the distal tip and it may be adapted to engage over at least part of the distal tip.
The deflector element can thus be formed with a recess which is adapted to receive the distal end of a prosthesis with which it is to be used, the recess being dimensioned to extend beyond the end of the prosthesis to provide a void to the stem tip.
The element can be made from any convenient material, for example synthetic plastics material in the form of polymethylmethacrylate (PMMA).
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patent: 5755720 (1998-05-01), Mikhail
patent: 5788704 (1998-08-01), Timperley
patent: 5997581 (1999-12-01), Khalili
Benoist Girard SAS
Lerner David Littenberg Krumholz & Mentlik LLP
Mancene Gene
Robert Eduardo C.
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