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Anti-screwing jackscrew for pedicle screw

A pedicle screw and anti-rotation technology, which is applied in the field of medical devices, can solve problems such as implant failure, top wire damage, and easy overload, and achieve the effect of reducing the incidence of wire burst and reducing positive pressure

Inactive Publication Date: 2015-10-07
TRAUSON CHINA MEDICAL INSTR COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the plane rigid contact friction force is relatively small and difficult to control, it is very easy to generate overload when tightening the jackscrew to compress the connecting rod, so that the jackscrew and pedicle screw thread will be damaged, that is, the wire burst, which will cause the implant failure of

Method used

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  • Anti-screwing jackscrew for pedicle screw
  • Anti-screwing jackscrew for pedicle screw

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Experimental program
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Effect test

Embodiment Construction

[0014] The present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Such as figure 1 As shown, a pedicle screw includes a screw, a screw base 1 arranged on the top of the screw, a connecting rod 2 arranged on the screw base 1, an anti-rotation screw 3 is arranged in the screw base 1, and an anti-rotation screw 3 is arranged in the screw base 1. The wire is threaded with the nail seat 1, and the anti-rotation jack wire 3 is in close contact with the connecting rod 2.

[0016] Such as figure 2 As shown, the anti-rotation jackscrew 3 includes an anti-rotation jackscrew body, and a number of rigid solid spines 4 and sub-rigid porous bodies 5 are arranged below the anti-rotation jack-screw body, and the sub-rigid porous body 5 covers the rigid solid spines 4 superior.

[0017] The contact side between the anti-rotation top wire 3 and the connecting rod 2 of the present invention is a rigid solid thorn 4 covered b...

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Abstract

The invention discloses an anti-screwing jackscrew for a pedicle screw. The anti-screwing jackscrew comprises an anti-screwing jackscrew body, a plurality of rigid spines and secondary rigid multi-hole bodies are arranged below the anti-screwing jackscrew body, and the rigid spines are covered with the secondary rigid multi-hole bodies. Compared with the prior art, the anti-screwing jackscrew structure is changed, the locking force is formed depending on the solid rigid spines and the arc-shaped surface of a connecting rod, and the anti-screwing jackscrew rotates more smoothly through the secondary rigid multi-hole bodies; meanwhile, the locking force of the anti-screwing jackscrew is increased through concave plastic deformation under supporting of the rigid solid spines, the positive pressure is reduced under the condition that the equal locking effects is achieved, and the screw exploding occurrence rate of the anti-screwing jackscrew is decreased.

Description

technical field [0001] The invention relates to a pedicle screw anti-rotation top wire, which belongs to the field of medical instruments. Background technique [0002] At present, the connecting rod of the pedicle screw is locked by the friction between the rigid plane of the top wire and the connecting rod. The quality of the locking effect is directly related to the magnitude of the friction force. The greater the friction force, the better the locking effect . When the friction coefficient is constant, the friction force is directly proportional to the normal pressure, and increasing the friction force must increase the normal pressure. The positive pressure between the jacking wire and the connecting rod comes from the pressure generated after the outer thread of the jacking wire is tightened with the inner thread of the pedicle screw. Because the plane rigid contact friction force is relatively small and difficult to control, it is very easy to generate overload when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/70
CPCA61B17/7001
Inventor 董乃光王爱国
Owner TRAUSON CHINA MEDICAL INSTR COMPANY