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Intervertebral disc prosthesis and fitting tools

A technology for intervertebral discs and prostheses, which is used in prostheses, medical science, joint implants, etc., and can solve problems such as imprecise position, increased wear, or clamping blockage.

Inactive Publication Date: 2008-01-09
LDR MEDICAL SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this contact is based on a very tight angle between the mutual bearing surfaces, which makes the location of this restriction imprecise and increases the risk of galling or clamping jams
In addition, the rotational play allowed by such kinematic properties is directly dependent on the play allowed for movement and cannot be chosen independently of the latter when designing the prosthesis

Method used

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  • Intervertebral disc prosthesis and fitting tools
  • Intervertebral disc prosthesis and fitting tools
  • Intervertebral disc prosthesis and fitting tools

Examples

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Embodiment Construction

[0039]Figure 6b shows a prior art prosthesis according to patent FR 2 659 226, comprising a concave upper plate 3AA sliding on an inner core 2AA, the inner core having a spherical upper cap 23AA, itself fixed in a recessed area of ​​the lower plate 1AA ;In horizontal position and maximum tilt position. Since the center csAA of the ball providing the interface with the inner core lies outside this upper plate 3AA, its tilting incorporates a significant lateral displacement. This displacement breaks the continuity of the vertical shape of the spine, impedes overall mobility, and risks immediate or long-term damage to tissues surrounding the vertebrae, such as ligaments and the spinal cord.

[0040] Figure 6c shows a prior art prosthesis according to patent FR 2 730 159, comprising a movable inner core with two spherical surfaces oriented in the same direction, movable laterally between the two plates and allowing tilting without There is no lateral displacement. However, in th...

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Abstract

The present invention concerns an intervertebral disc prosthesis designed to be substituted for fibrocartilaginous discs ensuring connection between the vertebra of the vertebral column or the end of the latter. The invention increases stability of such a prosthesis by providing a translation or rotation stop to its nucleus (2), or inducing an angular correction between its plates (1, 3) in contact with vertebra, or a combination of these characteristics. Such a stop is obtained by parts (6, 20) external to the nucleus, and using contact surfaces perpendicular to their contact directions. Such a stop allow a better stability together with the enforcement of such an angular correction, induced by an angle (a3) between loadbearing surfaces (21, 23) of the nucleus.

Description

[0001] This divisional application is a divisional application based on the Chinese patent application with the application number 02811435.3, the application date being May 3, 2002, and the invention title being "intervertebral disc prosthesis and installation tool". technical field [0002] The invention relates to a device for installing an intervertebral disc prosthesis. Background technique [0003] The intervertebral disc is formed from a deformable but incompressible unit called the "soft core", which contains approximately 80% water and is surrounded by several layers of elastic fibers, concentrated to hold the core, absorb the forces acting on the entire disc and stabilize the activity. joints. These units can often shatter or become damaged due to compression, displacement or wear following impact, infection, excessive stress, or simply due to prolonged periods of time. [0004] Fragmentation of this joint unit can cause severe pain and significant restriction of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/56A61F2/46A61B17/02A61B17/28A61B17/17A61F2/00A61F2/30A61F2/44
CPCA61F2002/30878A61B2017/0256A61F2002/30369A61F2002/30112A61F2002/30604A61F2220/0025A61F2002/443A61F2002/4627A61F2002/30398A61F2002/30354A61F2/4425A61F2230/0004A61F2002/30125A61B17/1757A61F2002/30663A61F2/4611A61F2002/30662A61F2002/30841A61F2230/0008A61F2310/00029A61F2002/30884A61F2002/30372A61F2002/30642A61F2002/30113A61F2230/0006A61F2002/4635A61F2220/0033A61F2002/30649A61F2002/4687A61F2/44
Inventor 雅克·博兰若埃尔·德莱克林米夏埃尔·奥尼穆斯埃尔韦·沙泰涅热罗姆·阿兰让-保罗·F·斯泰布
Owner LDR MEDICAL SAS
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