Surgery – Instruments – Orthopedic instrumentation
Patent
1996-11-18
1999-03-09
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 92, A61B 1756
Patent
active
058793550
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
This application is filed under 35 USC 371 based on PCT/SEQ/00542 filed on May 15, 1995.
This invention relates to a device for use in transplantation of bone tissue material in a cavity in bone, said device comprising means for compacting the bone tissue material in the cavity.
In my published Swedish patent applications No. 9200501-6 and 9300572-6, a device of the kind being related to above is described. The object of the transplantation is to give the cavity a desired shape with a required thickness of the bone material forming the wall of the cavity. In the prior patent applications, pretreatment in such orthopaedic surgical operations in which a portion of a prosthesis shall be inserted into said cavity and be secured therein is described as a possible application. Bone cement is then utilised for the securing between the prosthesis portion and the wall of the cavity defined by the bone tissue material.
A particularly preferred application according to my prior Swedish patent applications relates to preparation of cavities in femurs as to receive a portion of a hip joint prosthesis. However, it was pointed out that the invention thereby related to could be applied also in other cases where arbitrary prostheses, for example joint prostheses, are to be applied in a bone of the individual.
The invention according to the present application as well as the invention aspects treated in my prior Swedish patent applications are based upon that a bone transplant formed by a bone tissue material is inserted into the cavity, said bone tissue being present in the bone transplant in the form of a plurality of small pieces or particles, i.e. in a ground or finely divided state. The bone tissue material is brought into a suitable consistency, such as paste or pulp. The bone tissue material then contains a suitable liquid. This liquid may comprise tissue liquid, such as blood. The liquid comprises suitably also water. Furthermore, the liquid may include fat, preferably in the form of living tissue.
The present invention is based upon the knowledge of that the compacting of the bone tissue material into the cavity, which is of considerable importance for the transplantation, is difficult to accomplish as the bone transplant comprises fat and blood tends to flow into the bone transplant from the bottom side. As one then tries to accomplish the compaction of the bone transplant by means of the compacting means, said transplant tends to displace itself upwards along the sides of the compacting means instead of letting itself get compacted effectively deeper in the cavity. These problems are present in the application primarily related to according to my prior patent applications, that is for the preparation of cavities in femurs for the purpose of receiving hip joint prostheses, as well as in the application primarily foreseen in the present invention, that is bone transplantation in a joint socket. This joint socket may for instance be intended to receive the joint ball of a hip joint prosthesis.
When bone losses have led to the need of joint transplantation in a joint socket with ground bone transplant, this has, until now, taken place by means of compacting means presenting an even, outer spherical surface. When the joint socket has been filled up to a required degree with grinded bone transplant, the compacting means has been applied to the transplant and struck or pressed down into that same, the transplant being subjected to compaction and forming itself according to the joint socket in its lower limitation and forming itself according to the compacting means in its upper limitation. Thereby, the compacting surface of the compacting means has a shape corresponding to the ball aimed at cooperation with the joint socket. The problems consisting of the tendency of bone transplant to displace itself out of the joint socket has already been mentioned above.
SUMMARY OF THE INVENTION
The object of the present invention is to further develop prior technique so that the compacting m
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