Novel vertebral pedicle bolt structure for reduction of thoracolumbar fracture and reduction and fixation of lumbar spondylolisthesis

A technology of pedicle screw and spondylolisthesis, which is applied in the direction of fixator, internal fixator, internal bone synthesis, etc., can solve the problems of influence and lack of rotation force, and achieve convenient locking, less bone damage, and ingenious design Effect

Inactive Publication Date: 2009-12-16
郑修军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are some shortcomings in the clinically used reset systems. Although most of the systems provide the force of stretching and pulling, they do not provide the force of rotation.
Even if some systems provide the force of rotation (such as TSRH-3D), if the rod is locked after stre

Method used

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  • Novel vertebral pedicle bolt structure for reduction of thoracolumbar fracture and reduction and fixation of lumbar spondylolisthesis
  • Novel vertebral pedicle bolt structure for reduction of thoracolumbar fracture and reduction and fixation of lumbar spondylolisthesis
  • Novel vertebral pedicle bolt structure for reduction of thoracolumbar fracture and reduction and fixation of lumbar spondylolisthesis

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Embodiment

[0045] Please refer to Figures 1a to 1d , The side locking screw rod connector mainly includes a rod connector 30 , a screw connector 10 , and a tapered locking ring 20 . The screw connector has an opening 11 for receiving a pedicle screw. The screw connector 10 has an open groove 16 so that the screw connector can elastically shrink in the radial direction. At the same time, the open slot is convenient for shrinking into the locking ring during installation. The tapered locking ring 20 fits over the screw connector 10 and also has a semicircular opening 21 for receiving the screw. The tapered locking ring also has two grooves 22, so that special surgical instruments can be used to clamp the tapered locking ring 20 to perform locking action. Figure 1c Shown is the position of the tapered locking ring 20 when unlocking. When the locking ring 20 is pushed to the left, the screw connector 10 will be compressed radially, and at the same time, the opening 11 of the screw conne...

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Abstract

The invention discloses a novel vertebral pedicle bolt structure for reduction of thoracolumbar fracture and reduction and fixation of lumbar spondylolisthesis, which is characterized in that the invention comprises a vertebral pedicle bolt, a bolt connector, a rod connector and a taper lock loop, wherein, the bolt connector is provided with an opening for receiving the vertebral pedicle bolt, and is provided with a connecting structure for connecting the rod connector; the rod connector is provided with two openings, wherein, one opening is used for receiving the rod, and the other opening is used for receiving and locking a nut; the taper lock loop is used for tightly locking and unlocking the bolt connector with the vertebral pedicle bolt and for tightly locking and unlocking the rod connector with the bolt connector. The structure of the invention can finish adjusting on frontal plane, sagittal plane and cross section direction; meanwhile, the rod and the bolt are respectively locked, which can provide propping as well as lifting and rotating strength so as to bring convenience for reduction of fracture and spondylolisthesis. The structure has the advantages of artful design, small structure, and small influence on bone grafting surface.

Description

technical field [0001] The invention relates to a pedicle screw fixing structure used for reduction and fixation of thoracolumbar fractures and spondylolisthesis. Specifically, the screw structure mainly includes a low-profile, two-step locking, free-rotating lateral locking rod connector and a specially designed pedicle screw. Background technique [0002] Thoracolumbar fractures, especially thoracolumbar fractures, are the most common types of spinal fractures. 90% of spinal fractures occur in the thoracolumbar spine (T11 to L4). The mechanism of injury, degree of fracture instability, whether associated with nerve injury, and the age of the patient are the main factors that determine the treatment. Most stable thoracolumbar fractures do not require surgery, but only certain external fixation and early mobilization. However, surgery is required if the patient has spinal instability, progressive spinal deformity, and / or nerve damage. In addition to nerve decompression, t...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61B17/70
Inventor 郑修军
Owner 郑修军
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