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Modular femur-head prosthesis

A femoral head and assembly technology, applied in the direction of femoral head, femoral shaft, prosthesis, etc., can solve the problem of multiple pieces, achieve high connection safety, small number of pieces, and large variability

Inactive Publication Date: 2011-05-11
WALDEMAR LINK GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a significant reduction in the required number of pieces can be achieved with this assembled femoral head prosthesis, a considerable number of pieces is still required to take into account individual differences in the required stem length and / or head height

Method used

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  • Modular femur-head prosthesis
  • Modular femur-head prosthesis
  • Modular femur-head prosthesis

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] According to the embodiment shown in the drawings, the assembled femoral head prosthesis comprises a handle 1 and a neck 2, which are expanded by a screw fastener placed on the neck 2 and engaged to the handle 1. The bolts 3 are connected together. Furthermore, this "assembled femoral head prosthesis may have one or more washers 4.

[0026] The shank 1 comprises a tapered lower anchoring area 11 with a plurality of anchoring tendons 12 extending longitudinally of the shank 1 . Furthermore, the shank 1 comprises in its upper region a connecting piece 13 of reduced cross-section, which has a substantially cylindrical surface 14 whose outer contour corresponds to the outer contour of the washer 4 . At its upper end, it has a support surface 15 provided with radial teeth 16 .

[0027] The neck 2 is divided into two functional areas: the first functional area is the fixed area 21, which includes the fixed shaft of the truncated cone for the joint ball (not shown) of the ar...

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PUM

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Abstract

The invention relates to a modular femur-head prosthesis comprising a shaft part (1) for inserting into a medullary opening of a femur and a neck part (2) comprising a receiving surface (25), said neck part being fixed to a supporting surface (15) in the end region of the shaft part (1) by means of a screw element (3). According to the invention, at least one separate intermediate ring (4) is provided, said ring being situated between the supporting surface (15) of the shaft part (1) and the receiving surface (25) of the neck part (2) and being fixed by means of the screw element (3). This allows femur head-prostheses of differing sizes to be made available by a simple substitution of a component and allows the operating surgeon to also adapt the length of the prosthesis to solve problems that are discovered intraoperatively.

Description

technical field [0001] The invention relates to an assembled femoral head prosthesis comprising a handle for insertion into the femoral medullary hole and a neck with a positioning surface which is bolted to a support surface on the proximal end of the handle superior. Background technique [0002] It is curative to fit a femoral head prosthesis in the case of a defect in the natural femoral head area due to wear or disease and implantation of an artificial hip joint. As we all know, femoral head prostheses have a variety of structural types, and the differences are particularly manifested in the way the femur is fixed. Rather, this difference concerns the shape and especially the length of the insertion handle. The selection of the shank and its length should be adapted to the anatomical proportions of the individual patient. In order to keep the required number of different prosthetic parts small, it is known that femoral head prostheses must be assembled in a modular m...

Claims

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Application Information

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IPC IPC(8): A61F2/30A61F2/36
CPCA61F2/30724A61F2/30734A61F2/36A61F2/367A61F2/3676A61F2/4603A61F2/4607A61F2/4637A61F2/4657A61F2002/30235A61F2002/30332A61F2002/30354A61F2002/30405A61F2002/30433A61F2002/30494A61F2002/30507A61F2002/3055A61F2002/30558A61F2002/30604A61F2002/30616A61F2002/30617A61F2002/3079A61F2002/30797A61F2002/3625A61F2002/3631A61F2002/365A61F2002/3674A61F2002/4627A61F2002/4638A61F2002/4667A61F2220/0025A61F2220/0033A61F2220/0041A61F2230/0069A61F2250/0074A61F2250/0097
Inventor A·凯勒
Owner WALDEMAR LINK GMBH & CO
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