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Improved spinal dynamic internal fixation device

A fixation device and spine dynamic technology, applied in the direction of internal fixator, fixator, internal bone synthesis, etc., can solve the problems of poor stability, broken nails, high stress, etc., achieve good stability, increase rigidity, and reduce bending moment Effect

Inactive Publication Date: 2012-06-20
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above analysis, it can be seen that the existing fixing system composed of elastic rods has low rigidity, poor stability, high stress and too concentrated, easy to cause broken nails and broken rods

Method used

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  • Improved spinal dynamic internal fixation device
  • Improved spinal dynamic internal fixation device
  • Improved spinal dynamic internal fixation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see Figure 1 ~ Figure 3 , the spinal dynamic internal fixation device of this embodiment is composed of an elastic fixator 3 connecting two adjacent segments of the vertebral body and two pedicle screws 1 anchoring the elastic fixator 3 on the vertebral body, wherein the The elastic fixator 3 described above is a U-shaped rod-shaped structure, and the distance between the two sides 3-1 is equal to the vertebral arch on the vertebral bodies of the two adjacent segments. The distance between the roots, the length of each side 3-1 is equal to 1 / 2 of the sagittal diameter of the patient's vertebrae; the two sides 3-1 have a rectangular head 3-2, the rectangular head 3- 2. A tapered threaded hole 3-3 for anchoring the pedicle screw 1 is provided, and the surface of the cap 1-1 of the pedicle screw 1 is provided with a tapered threaded hole 3-3 that matches the described tapered threaded hole 3-3. The tapered thread, the end of the nut 1-1 is provided with an inner hexagonal...

Embodiment 2

[0022] see Figure 4 ~ Figure 8 , in this example, the anchoring structure between the pedicle screw 1 and the elastic fixator 3 is as follows: the rectangular head 3-2 of the two sides 3-1 of the elastic fixator 3 is provided with a spherical hole 3-4, The spherical hole 3-4 is embedded with a connecting ring 4 with a notch 4-1. The inner hole of the connecting ring 4 is a tapered hole with an internal thread on the surface. The nail cap of the pedicle screw 1 1-1 is a tapered nail cap with external threads on the surface, and is threadedly connected with the inner hole of the connecting ring 4; the outer wall of the connecting ring 4 is densely covered to increase the friction with the spherical hole 3-4 The raised 4-2. Since the connecting ring 4 is provided with a notch 4-1, when the nail cap 1-1 of the pedicle screw 1 is screwed into the inner hole of the connecting ring 4, the connecting ring 4 is expanded outwards and tightened on the spherical hole 3 Within -4, the a...

Embodiment 3

[0026] see Figure 10 ~ Figure 16, in this example, the elastic fixator 3 and the pedicle screw 1 are anchored by a cylindrical nail seat 2, and the upper end of the nail seat 2 is provided with a U-shaped slot 2-3, and the slot 2-3 The width matches the diameter of the head 3-2 of the side 3-1 of the elastic fixer 3, and the groove bottom matches the shape of the head 3-2 of the side 3-1 of the elastic fixer 3. match, and the angle a formed with the axis of the nail base 2 is 15°-45°. The body of the nail seat 2 is provided with an axial through hole, which is formed by connecting the upper cylindrical hole 2-1 and the lower hemispherical hole 2-2, wherein the upper head of the cylindrical hole 2-1 is provided with Internal thread, the lower port of the hemispherical face 2-2 is provided with a slit 2-4, and the slit 2-4 is located directly below the deeper end of the groove bottom of the above-mentioned slit 2-3 (see Figure 13 ~ Figure 15 ). The nail cap 1-1 of the descr...

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Abstract

The invention relates to an improved spinal dynamic internal fixation device, which consists of an elastic fixator (3) which is connected with two adjacent sections of vertebrae and two vertebral pedicle screws (1) for anchoring the elastic fixator (3) on the vertebrae, and is characterized in that: the elastic fixator (3) has a U-shaped rodlike structure; the distance between two lateral edges (3-1) of the U-shaped rodlike structure is equal to that between vertebral pedicles on two adjacent sections of vertebrae; heads (3-2) of the two lateral edges (3-1) of the U-shaped rodlike structure are provided with anchoring structure; and after the elastic fixator (3) is anchored with the two vertebral pedicle screws (1), an included angle between axes of the vertebral pedicle screws (1) and a plane to which the elastic fixator (3) is positioned is between 15 and 45 degrees. A dynamic fixed system formed by the improved spinal dynamic internal fixation device has high rigidity and stability.

Description

technical field [0001] The invention relates to a medical surgical instrument, in particular to a spinal internal fixator. Background technique [0002] The clinically applied spinal internal fixation system generally consists of two parts, that is, pedicle screws for anchoring and connecting members such as steel rods and steel plates for bridging. The working principle of the spinal internal fixation system is: take the lesion as the center, drive pedicle screws into the upper vertebral body and the lower vertebral body respectively, and fix the pedicle screws through connecting components, so that the upper and lower vertebral bodies become As a whole, the connecting piece replaces the original lesion to bear various forces of the spine. The internal fixation system of the spine can be divided into two types: rigid fixation and dynamic fixation according to the type of connecting components. Among them, rigid fixation uses straight steel rods, straight steel plates and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/70
Inventor 赵卫东王海明孙培栋刘阳
Owner SOUTHERN MEDICAL UNIVERSITY