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Universal vertebral pedicle screw system capable of moving slightly

A technology of pedicle screw and screw seat, applied in the direction of internal fixator, internal bone synthesis, fixer, etc., can solve the problems of height loss, delayed union, fracture nonunion, etc., to improve quality, promote bone healing, avoid The effect of too much range of motion

Inactive Publication Date: 2012-07-11
陈远明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopt this kind of strong internal fixation method and there will be such problem: because described fixation bar is rigid, the stress between the two vertebral bodies that is stretched is mainly supported by this fixation bar, bears, and in the space between two vertebral bodies The newly grown bone bears less stress, so it is easy to cause osteoporosis, resulting in nonunion or delayed union of the fracture. When the internal fixation device is removed, the vertebral body will collapse again after being loaded, and the height will be lost again
Therefore, the solution described in the above patent application still belongs to the solution of strong fixation, wherein the compression washer locks the spherical cap of the pedicle screw after being screwed into the universal head sleeve, that is, it is connected between the vertebral bodies. Normal physiological fretting cannot be realized, and the defects of the above-mentioned prior art still exist

Method used

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  • Universal vertebral pedicle screw system capable of moving slightly
  • Universal vertebral pedicle screw system capable of moving slightly
  • Universal vertebral pedicle screw system capable of moving slightly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see Figure 1 to Figure 6 , the micro-movable universal pedicle screw system of this embodiment is composed of screw rod 1 and two groups of pedicle screw assemblies, each group of pedicle screw assemblies consists of screw base 2, pedicle screw 3, limit Bit block 6 and screw plug 5 constitute. see Figure 3 ~ Figure 6 , the upper part of the nail base 2 is cylindrical, and the lower part is hemispherical; the upper part of the nail base 2 is provided with a U-shaped groove 2-1 for piercing the nail rod 1, and the inner body of the nail base 2 is coaxially provided with a The through hole of pedicle screw 3, the top of this through hole is cylindrical, is provided with internal thread on it, and the bottom of through hole is lower hemispherical socket 4-2, and the diameter of the cylindrical part of described through hole is larger than lower. The diameter of the hemispherical socket 4-2 forms a step at the bottom of the cylindrical part to limit the position of the s...

Embodiment 2

[0038] see Figure 10 ~ Figure 12 , this embodiment is an improved solution of Embodiment 1, and the improvement is that the pedicle screw assembly further includes a limiting ring 8, and the limiting ring 8 is threadedly connected to the through hole set in the screw seat 2 body. Inside, and located at the lower part of the lower hemispherical recess 4-1; the limiting part 4-3 in the through hole provided in the body of the nail base 2 is the inner hole of the limiting ring 8.

[0039] Embodiments other than the above in this embodiment are the same as in Embodiment 1.

Embodiment 3

[0041] see Figure 10 , The difference between this embodiment and Embodiment 1 is that there are three pedicle screw assemblies in this embodiment.

[0042] Embodiments other than the above in this embodiment are the same as in Embodiment 1.

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Abstract

The invention discloses a universal vertebral pedicle screw system capable of moving slightly, which consists of a screw bar (1) and at least two vertebral pedicle screw assemblies arranged on the screw bar (1). Each vertebral pedicle screw assembly comprises a screw seat (2), a vertebral pedicle screw (3), a limiting block (6) and a plug screw (5), and a screw cap (3-2) of each vertebral pedicle screw (3) is spherical; a through hole is arranged in each screw seat (2), inner threads are arranged on the upper portion of each through hole, and a lower hemispherical pit (4-1) is arranged on the lower portion of each through hole; and each limiting block (6) is arranged in the through hole of the corresponding screw seat (2), an upper hemispherical pit (4-2) is arranged on the lower end surface of each limiting block (6) and is combined with the corresponding lower hemispherical pit (4-1) to form a spherical hole (4) capable of covering the corresponding spherical screw cap (3-2), and each spherical hole (4) is in movable fit with the spherical screw cap (3-2) of the corresponding vertebral pedicle screw (3).

Description

technical field [0001] The invention relates to a medical surgical instrument, in particular to a spinal internal fixator. Background technique [0002] Segmental instability of the spine, fracture fragments, or displacement of intervertebral disc tissue caused by lumbar fractures can compress the dural sac or nerve roots, causing neurological symptoms. Patients with neurological symptoms or severe fracture compression often require surgical treatment. The purpose of surgical treatment is to stabilize the spine, restore the height of the vertebral body, decompress the spinal canal, and reduce the compression on the nerves. The current classic operation method is to use the screw rod (or screw plate) system for strong internal fixation through the posterior pedicle. The specific method is to implant screws in the upper and lower parts of the injured vertebral body, and connect the fixation rod (or steel plate) between the two screws. ), the vertebral body is stretched apart...

Claims

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Application Information

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IPC IPC(8): A61B17/70
Inventor 陈远明
Owner 陈远明
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