Cement pressurizer with flange

Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone

Reexamination Certificate

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Details

C606S094000

Reexamination Certificate

active

06254641

ABSTRACT:

The present invention relates to a pressuriser device particularly for use in cemented femoral hip stem replacement. The pressuriser device is also suitable for use in other cemented prosthetic applications.
A femoral bone is prepared for a replacement hip stem prosthesis by expanding the internal cavity of the femoral bone by using a broach or rasp. The broached cavity is filled with bone cement either before or after the insertion of the hip stem prosthesis.
In the method in which a hip stem prosthesis is inserted after the cement is introduced into the broached cavity, it is important to centralise the stem within the prepared femoral cavity and to maintain the pressure of the cement surrounding the hip stem prosthesis. Centralisation of a hip stem prosthesis and pressurisation of the cement have been linked to long term stem survivability in hip replacement surgery.
According to the present invention, there is provided a pressurisation device in the form of a collar defining an opening for accommodating a prosthetic component, wherein the collar is surrounded by a radially extending flexible flange.
Preferably, the flexible flange extends radially from the hollow collar such that the collar has an upper body portion above the flexible flange and a lower body portion below the flexible flange.
The upper and lower body portions may comprise generally U-shaped members. Preferably, the internal profile of the upper body portion is adapted to correspond to the prosthetic component.
Preferably, the upper and lower body portions have sealing lips in which the flexible flange is sealed.
The external profile of the lower body portion may be shaped to correspond to a bone cavity in which the prosthetic component is to be disposed.
The upper body portion may optimally have a shoulder adjacent the U-shaped member which, in use, rests on the entrance to the bone cavity in which the prosthetic component is to be disposed.
Preferably, the flexible flange is transparent to allow clarity of positioning. Preferably, the prosthetic component is a prosthetic hip stem and the bone cavity is a femoral canal.
Preferably, the upper and lower body portions are formed of silicon rubber. The sealing lips of the upper and lower bodies may be approximately 3 millimeters thick.
Preferably, the flexible flange is between 0.5 and 1 millimeter thick. Preferably, the flexible flange has a diameter of approximately 10 centimeters.
The pressuriser device may be supplied in varying sizes to suit the bone cavity.


REFERENCES:
patent: 4274163 (1981-06-01), Malcom et al.
patent: 4595006 (1986-06-01), Burke et al.
patent: 4783192 (1988-11-01), Wroblewski et al.
patent: 4815454 (1989-03-01), Dozier, Jr.
patent: 5741265 (1998-04-01), Chan

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