Surgery – Instruments – Orthopedic instrumentation
Patent
1998-05-01
1999-11-09
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
A61B 1758
Patent
active
059805277
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a bone cavity sealing gasket which can be fitted over the resected end of a bone to be provided with bone cement in its axial medullary cavity, to an assembly for injecting bone cement into a bone cavity which includes the bone cavity sealing gasket, and to a method of injecting bone cement into a bone cavity.
BACKGROUND OF THE INVENTION
The formation of cement bond between a bone and a prosthesis generally involves injection of bone cement into the cavity of the bone and location of the prosthesis in the cement in the cavity. The bond involves the cement grout interlocking with the bone and the prosthesis. Generally, the end of the bone will be resected before location of the prosthesis. This technique is used, for example, in hip, knee and shoulder replacement.
It is generally desirable to inject the cement into the cavity under pressure to ensure that the cavity is properly filled with cement. The application of pressure to the cement in the cavity requires that flow of the cement out of the cavity be controlled. It is known to control the flow of cement by means of a sealing gasket which can be fitted over the resected end of the bone, through which the bone cement can be injected into the bone cavity. Once the cement has been injected, the gasket is removed with or after removal of the cement injection apparatus allowing the prosthesis then to be located in the cement in the cavity.
Removal of the gasket after injection of the cement and before location of the prosthesis has the disadvantage that the injected cement can be disturbed, possibly weakening the bond of the cement to the bone cavity.
SUMMARY OF THE INVENTION
The present invention provides a bone cavity sealing gasket which comprises a sealing plate with an opening in it through which a prosthesis can be located in the bone cavity, and in which a plug can be received through which cement can be injected into the cavity.
Accordingly, in one aspect, the invention provides a bone cavity sealing gasket which can be fitted over the resected end of a bone to be provided with bone cement in its axial cavity, the gasket comprising (a) a sealing plate which has a quantity of a resiliently deformable material on its lower face to enable a seal to be created between the plate and the upper edge of the bone, and an opening extending through it, and (b) a plug which can be received in the opening in the sealing plate and which has an injection port extending through it and through the opening in the sealing plate, in which the injection nozzle of bone cement delivery apparatus can be received.
The gasket of the invention has the advantage that it the sealing plate can remain in place on the resected end of the bone after injection of bone cement into the bone cavity and while the prosthesis is located in the cavity. In this way, the injected bone cement remains substantially undisturbed between injection and location of the prosthesis; in particular, it is not subjected to reduction of pressure and withdrawal of bone cement from trabecular spaces, which can arise when a sealing gasket is removed before the cement is sufficiently hardened. This means that the bond of the cement to the bone of the cavity can be established with greater confidence.
The sealing plate has a quantity of resiliently deformable material on its lower face which facilitates the formation of the seal to the bone. The deformable material enables deviations from planarity in the end face of the bone to be accommodated without disrupting the seal unacceptably. The deformable material might be for example a material with elastomeric properties. An example of a suitable material might be a silicone based material. The material will be provided in the region of the sealing plate in sufficient thickness to enable a sufficient seal to be made to the bone, taking into account the deviations from planarity of the end of the bone and the force that can be applied to the sealing plate against the bone. For example, the deformable material
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patent: 5047061 (1991-09-01), Brown
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Cohen Andrew Michael
Naybour John
Buiz Michael
DePuy International
Ho (Jackie ) Tan-Uyen T.
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