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Intervertebral internal prosthesis with toothed connection board

A connecting plate and intervertebral technology, applied in the direction of prosthesis, medical science, fixer, etc., can solve difficult problems and achieve the effect of eliminating danger

Inactive Publication Date: 2005-05-11
WALDEMAR LINK GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to do this work on the spine

Method used

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  • Intervertebral internal prosthesis with toothed connection board
  • Intervertebral internal prosthesis with toothed connection board
  • Intervertebral internal prosthesis with toothed connection board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The intervertebral endoprosthesis 1 inserted between two vertebral bodies 2 comprises two connecting plates 3 and a core 4, the outer side 5 of the connecting plates 3 has a plurality of tines 6, which act in the direction of the arrow 7 The forces and possibly also the actual pressure acting between the vertebral bodies 2 are pressed into the outer skin end piece 8, thereby ensuring the desired position of the prosthesis.

[0022] The teeth 6 are divided into two groups at the ventral and dorsal edges 9 of the web 3 and are symmetrical about a radial axis 10 extending in the ventral-dorsal direction. The middle teeth of each group are positioned relative to the diametrical direction 10 , while the peripheral teeth are surrounded by an angle α with the diametrical direction, the included angle α is about 30° and should be greater than 20°. The reason for this is that the teeth overcome the shear forces generally but not exclusively in the A-P direction that fix the pros...

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PUM

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Abstract

The connecting plate (3) placed against the bone surface in a direction across the main line along which it extends has teeth protruding in the placement direction . The teeth are defined by surfaces (11,12,13) which are positioned across the direction of thrust and which include a main surface (11). Each two teeth or groups of teeth face each other in contrary directions in the direction of thrust. The edges (14)of the main surfaces are sharp. the side surfaces (13) of the teeth form an angle of not more than 80 degrees with the main surface.

Description

technical field [0001] The present invention relates to intervertebral prosthesis. Background technique [0002] The known intervertebral endoprosthesis (EP-B-176,728) comprises two connecting plates between which a core is enclosed. These connecting plates will put pressure on the epithelial plate of one side of the vertebra. In order to ensure that the prosthesis does not lose its pre-determined position between the vertebral bodies due to shear forces which are mainly generated in the anterior-posterior direction parallel to the main direction of extension of the connecting plate, the connecting plate must be suitably connected to the vertebral body. For this purpose, the edges of the known prosthesis are provided with teeth, which protrude transversely from each connecting plate in order to penetrate the epithelial sheets of the vertebral bodies by the actual pressure acting between said vertebral bodies. In this case, they will prevent displacement of the connecting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/44A61B17/58A61F2/00A61F2/30
CPCA61F2/4425A61F2002/30156A61F2002/30158A61F2002/30663A61F2002/30841A61F2002/30892A61F2002/443A61F2230/0023A61F2230/0026A61F2002/30845A61F2/30
Inventor A·克勒
Owner WALDEMAR LINK GMBH & CO