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

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...

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 stretching, the screw is locked at the same time and cannot provide pulling and rotating force. If the rod is not locked, the forceps need to be stretched Lifting and rotation with continuous distraction, so that the distraction forceps must be in the surgical field and will affect other operations

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