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Severe lumbar spondylolisthesis reduction fixing device

A technology of spondylolisthesis and fixation device, which is applied in the direction of fixator, internal fixator, internal bone synthesis, etc., can solve the problem of loss of lumbar motion unit and achieve the effect of ensuring normal use

Active Publication Date: 2020-08-21
HARBIN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Taking L5-S1 true slippage as an example, in the prior art, the six snails are usually divided into two rows for lifting and reset, and S1, L5, and L4 are respectively fixed; screws, but if the patient L4-5 is a normal intervertebral disc, one motor unit of the lumbar spine will be lost in vain

Method used

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  • Severe lumbar spondylolisthesis reduction fixing device
  • Severe lumbar spondylolisthesis reduction fixing device
  • Severe lumbar spondylolisthesis reduction fixing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The severe lumbar spondylolisthesis reduction and fixation device of the present invention includes two fixation units arranged side by side, the fixation unit includes a connecting rod body 1 and at least three pedicle screws 2, the connecting rod body 1 is installed on the pedicle screws 2, and fixed The unit also includes a connector 3, the connector 3 is provided with a first through hole 4 and a second through hole 5, and the connector 3 is also provided with a first threaded hole 401 communicating with the first through hole 4, and a first threaded hole 401 communicating with the second through hole. The second threaded hole 501 in which the holes 5 communicate with each other, the first threaded hole 401 and the second threaded hole 501 are equipped with a fixing screw 6, and the connecting rod body 1 includes a first connecting rod 101 penetrating through the first through hole 4 and a first connecting rod 101 penetrating through the second through hole 4. The se...

Embodiment 2

[0037] This embodiment is further optimized on the basis of Embodiment 1 as follows: it also includes a spread assembly 7 positioned outside the two fixed units, the spread assembly 7 includes pliers and a support unit 8, and the pliers include a first pliers body 701 and The second pliers body 702, the lower ends of the first pliers body 701 and the second pliers body 702 are provided with pin shafts 703, and the two ends of the support unit 8 are connected to the inner side walls of the first pliers body 701 and the second pliers body 702, The support unit 8 is located above the pin shaft 703 .

[0038] After adopting the above technical scheme: the two expansion units are located on the outside of the two fixation units, and the two intervertebral spaces are expanded by the expansion units to facilitate filling of the intervertebral fusion cage. After the intervertebral disc is removed, the expansion plate is placed In the intervertebral space, the lower ends of the first p...

Embodiment 3

[0040] This embodiment is further optimized on the basis of Embodiment 2 as follows: the lower ends of the first pliers body 701 and the second pliers body 702 are provided with expansion plates 705 . The upper ends of the first pliers body 701 and the second pliers body 702 are provided with positioning rings 704 for easy gripping.

[0041] After adopting the above-mentioned technical scheme: the upper and lower ends of the first pliers body 701 and the second pliers body 702 are respectively provided with a spreader plate 705 and a positioning ring 704 to facilitate the application of an opening force to the pliers, and the pliers are lifted by the spreader plate 705. The effect of stretching the intervertebral space.

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Abstract

The invention discloses a severe lumbar spondylolisthesis reduction fixing device, and relates to the technical field of lumbar spondylolisthesis reduction fixing devices. The fixing device comprisestwo fixing units which are arranged side by side. Each fixing unit comprises a connecting rod body and at least three pedicle screws; wherein the connecting rod body is arranged on the pedicle screw;the fixing unit further comprises a connector, a first through hole and a second through hole are formed in the connector in a penetrating manner; the connector is further provided with a first threaded hole communicated with the first through hole and a second threaded hole communicated with the second through hole, fixing screws are arranged in the first threaded hole and the second threaded hole in a matched mode, and the connecting rod body comprises a first connecting rod penetrating through the first through hole and a second connecting rod penetrating through the second through hole.

Description

technical field [0001] The invention relates to the technical field of resetting and fixing devices for spondylolisthesis, in particular to a resetting and fixing device for severe spondylolisthesis. Background technique [0002] According to Meyerding's classification, spondylolisthesis in which the vertebral body slides forward exceeds 2 / 4 of the sagittal diameter of the lower vertebral body is severe spondylolisthesis, including (Ⅲ, Ⅳ spondylolisthesis). The pathophysiological basis of the spondylolisthesis is the compression of bilateral exit roots, walking roots and cauda equina nerves after spondylolisthesis, and most of the root symptoms and spinal canal stenosis symptoms exist at the same time. For patients with severe spondylolisthesis, conservative treatment is often ineffective and surgical treatment is required. The key to surgical treatment is to remove nerve compression, deal with intervertebral disc herniation and ligament hypertrophy, correct the deformed sp...

Claims

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Application Information

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IPC IPC(8): A61B17/70A61B17/88
CPCA61B17/7002A61B17/7074A61B17/88A61B17/885
Inventor 胡宇航于占革
Owner HARBIN MEDICAL UNIVERSITY
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