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 cons

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] According to the embodiment shown in the figure, the assembled femoral head prosthesis includes a handle 1 and a neck 2, which are placed on the neck 2 and engaged with the handle 1 as an expansion of the bolt fastener The bolts 3 are connected to each other. In addition, this “assembled femoral head prosthesis can have one or more washers 4.

[0026] The shank 1 includes a lower anchoring area 11 that gradually shrinks in a conical shape, and the anchoring area is provided with a plurality of anchoring ribs 12 extending along the longitudinal direction of the shank 1. In addition, the shank 1 includes in its upper region a connecting piece 13 with a 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 supporting surface 15 equipped with radial teeth 16.

[0027] The neck 2 is divided into two functional areas: the first functional area is the fixed area 21, ...

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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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