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Hip joint prosthesis comprising a shaft to be inserted into the femur

A technology of hip joint prosthesis and shaft, which is applied in the field of hip joint prosthesis, can solve problems such as looseness, and achieve the effect of permanent connection

Inactive Publication Date: 2009-12-23
WALDEMAR LINK GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that such mechanical tension rods quickly become loose due to constant alternating loads and are therefore only effective for a short period of time.

Method used

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  • Hip joint prosthesis comprising a shaft to be inserted into the femur
  • Hip joint prosthesis comprising a shaft to be inserted into the femur

Examples

Experimental program
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Effect test

Embodiment Construction

[0019] Bone outlines are shown by solid lines in the attached figure 1 middle. The inner boundary line of cortical bone 1 is also indicated by a solid line, and its thickness is clearly visible. This is the case within the Backbone 2 area. Within the metaphysis 3, the cortex is so thin in most parts that it can only be represented by a single line.

[0020] The metaphysis 3 and some parts of the upper part of the diaphysis are filled with cancellous bone (not shown). In the present case, only the rotor region 4 known as being associated with the greater trochanter is of interest, and this is already indicated by shading. For the purposes of the present invention, it is delimited by boundary lines H and T. The first line is the midline between the femoral neck 5 and the hip head 6 . The second line is the tangent to the hip head 6 in the drawing plane through the intersection S of the line H and the central axis M of the nearest diaphysis. The skeletal trochanter part als...

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PUM

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Abstract

Hip prosthesis having a stem (12) inserted into the femur and comprising a trochanter surface portion intended to be located within the trochanter region (4), the trochanter surface portion having a coating, said coating Contains an osteoinductive substance. In order to improve the fixation of the femoral hip prosthesis in the bone without compromising the ability to perform subsequent surgeries, only this trochanteric surface part or a part thereof includes said osteoinductive substance.

Description

technical field [0001] The present invention relates to a hip prosthesis with a stem inserted into the femur. The hip prosthesis has a stem inserted into the femur and has a trochanter surface portion intended to be located in the region of the trochanter, the trochanter surface portion having a coating comprising an osteoinductive substance . Background technique [0002] The cancellous bone of the metaphysis of the femur has a complex structure of trabeculae through which the bony parts subjected to compressive and tensile loads at the femoral neck, greater trochanter, lesser trochanter, and diaphysis are connected in a manner that transmits compression and tension . They generally form continuous stretching and compression trajectories (Medical Chromatography, Vol. 7: Motion Machines I., Thieme Verlag, Stuttgart, 1992). When the stem of the hip prosthesis is inserted, the primary stretching trajectory, particularly the intertrochanteric surface area connecting the femor...

Claims

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Application Information

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IPC IPC(8): A61F2/36A61B17/16A61F2/00A61F2/28A61F2/30A61F2/46
CPCA61F2310/00976A61F2002/30322A61F2220/0041A61F2002/30604A61F2250/0026A61F2/3662A61F2002/3631A61F2/36A61F2/367A61F2002/30138A61F2002/3069A61F2002/3611A61B17/1659A61F2002/30433A61F2002/4619A61F2/30739A61F2310/00395A61F2230/0017A61F2002/3625A61F2002/4641A61F2002/2835A61F2002/368A61F2/30767A61F2310/00796A61F2002/30785
Inventor H·D·林克
Owner WALDEMAR LINK GMBH & CO