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Device for intrabody extension with screws working in traction

An extension device, human body technology, applied in the direction of internal fixator, internal bone synthesis, medical science, etc., can solve the problems of large bending fastness, large torque, firmness of unassisted devices, etc.

Active Publication Date: 2010-12-29
阿诺·苏贝朗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The length of the extension is therefore limited by the height of the bend of the rod under load, giving the rod and the internal thread that cooperates with it the bulk in the device - without contributing to the robustness of the device In particular, bending tightness - very large, especially the torque (couple) required to rotate the rod is also very large, so it is mandatory to determine the dimensions of the parts that control the rotation of the rod and limit them to Some simple, reliable but power-limited components are used in practice such as direct magnetic transmission between two permanent magnets without amplifying components as described in document US 6 336 929

Method used

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  • Device for intrabody extension with screws working in traction
  • Device for intrabody extension with screws working in traction

Examples

Experimental program
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Embodiment Construction

[0013] Preferred embodiments of the device shown in Figures 1-3 include:

[0014] - a substantially tubular elongated first section 1 comprising, at a first end 11 , a part enabling connection to the human body, for example by means of a body substantially perpendicular to said first part A first hole 61 of the axis of section 1 is formed for receiving a bolt not shown, and said first part comprises two diametrically opposed Longitudinal cuts 51,52. The first end 11 may also include gripping means, not shown, such as external threads (filetage) and for example grooves, for gripping the device to facilitate its surgical implantation, typically the device Implanted into the medullary cavity of an elongated bone, or implanted as an explant along or into the extension of all or part of an elongated or flat bone.

[0015] - a substantially cylindrical second section 2, the outer diameter of which corresponds substantially to the inner diameter of said first section 1 to which it ...

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PUM

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Abstract

A device for intrabody extension with screws working in traction. A first extended section (1) receives a second telescopic section (2). Each of these sections includes connection means (61), (62) from the organism to a first end point (11), (21), and is linked to a pin (3) containing at least one threading to a second end point (12) and (22). Rotation of the pin (3) controlled by means (4) causes relative movement of the two sections (1) and (2). Thus, the pin (3) is mounted between two end points (12) and (22) which get closer when the device extends, and the length of the loaded pin (7) decreases when the device extends and the length of the loaded pin (7) works only in traction. The device according to the invention is specifically designed for making screws for bone extension and growth prostheses.

Description

technical field [0001] The present invention relates to internal extension devices, such as bone extension screws, bone displacement screws, spinal distraction rods or growing prostheses. Background technique [0002] There are various in vivo prolonging devices, among which documents US 3 976 060 (Proc InstMech Eng [H]. 1989; 203(2): 97-102.), WO 01 / 78614, DE 85 15 687 U1 or US 6 336 929, these intracorporeal extension devices comprise an elongated first section, a second section telescopically mounted relative to said first section, and a connection to the organism The first connecting part, the second connecting part connected to the human body at the first end of the second section, the rod comprising at least one external thread - the rotation of the rod drives the second section relative to the The movement of the first section, the part that controls the rotation of the lever, and the connection parts between these components. However, in all these known devices, sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/72
CPCA61B2017/00411A61B2017/00876A61B17/7216A61B17/56A61B17/58A61B17/70
Inventor 阿诺·苏贝朗
Owner 阿诺·苏贝朗