US 4,904,267 A · Method and device for fixing a joint prosthesis

Abstract

The invention comprises a method and a device for fixing a joint prosthesis (1, 2; 5) in which all surfaces intended for tissue contact consist of titanium or a titanium-based tissue-compatible metallic material. For safely anchoring the prosthesis in relation to the bone tissue, use is made of pointed fixing elements (3, 11,16) which from the side of the bone tissue that should be facing the prosthesis are driven into the bone tissue with their pointed portions, and which are anchored in cement (9) between the prosthesis and the bone tissue or directly to the prosthesis, such that a solid connection is established by the bone tissue growing onto the anchored pointed portions. For proper adjustment of the prosthetic joint cup and the prosthetic joint ball, these members are moulded under pressure and heat, each respective articular surface being shaped against a model mould of the mating articular surface, and are hardened or sintered in shape contact for minimizing any aftertreatment.

Claims18

Dependent claims

A method for fixing a prosthesis in relation to living bone tissue comprising applying between the prosthesis and the bone tissue and in contact with the bone tissue, a plurality of fixing elements of a material and a surface structure which allows bone tissue to grow thereon, wherein the fixing elements have a first end which is inserted into the bone and a second end with a contact head or projection thereon to provide an attachment surface for the bone cement;

said fixing elements being inserted into the bone so that the projections or contact heads are spaced apart from the prosthesis and the bone and applying a bone cement which is capable of adhering to the prosthesis, between the bone tissue and the prosthesis, such that the prosthesis whereby the projections or contact heads are completely embedded in said bone cement through said bone cement and said elements, is connected to the bone tissue.

A method of fixing a hip joint prosthesis, said joint being of the type which comprises an acetabular cup prosthetic part and a femoral prosthetic part having a ball and stem;

said method comprising:
fixing said acetabular cup into a pelvis by means of pins or screws which extend from a convex portion of the cup into the pelvic bone;
said cup having an articular surface layer which is applied to a concave surface of the cup before said cup is fixed to the bone;
providing a plurality of fixing elements;
said fixing elements having a first end for insertion into the bone tissue and a second end with a contact head or projection thereon;
inserting the first end of the fixing elements into the bone within a femoral medullary canal;
said elements being inserted into the bone so that the projections or contact heads are spaced apart from the bone;
inserting the stem section of the femoral prosthetic part into the femoral medullary canal containing said fixing elements;
said stem having a centering means attached at a lower end thereof and said centering means having penetrating means for penetrating the wall of the bone to fix said centering means in the femoral medullary canal;
and said stem being narrower than the medullary canal so that upon insertion, a space is formed between the stem and the bone whereby said projections or said contact heads are spaced apart from the stem and the bone;
inserting said penetrating means into the bone to fix the centering means and attached stem to the bone;
cementing the stem in a canal by filling the space between the stem and the bone with bone cement whereby said femoral prosthetic part becomes fixed in the femoral medullary canal.

9 more elements

Dependencies are inferred from the claim text.

Method and device for fixing a joint prosthesis

Life of this patent

Method and device for fixing a joint prosthesis

Life of this patent

Abstract

Claims18