Posterior minimally invasive screw-rod system for thoracolumbar vertebral fracture

Abstract

The invention provides a posterior minimally invasive screw-rod system for thoracolumbar vertebral fracture. The posterior minimally invasive screw-rod system is characterized in that each pedicle screw is designed to be a long-tail hollow screw, the far end of the hollow screw is provided with cancellous bone threads (1), the near end of the hollow screw is provided with cortical bone threads (2), a screw tail (3) is U-shaped, and the far end of the screw tail is provided with a long tail (4); a screw tail self-breaking mark (5) is arranged on the outer side of the joint of the screw tail and the long tail, and the outer side of the long tail is provided with a long-tail plane (6); trapezoidal threads (7) are arranged on the inner sides of the screw tail and the long tail, and square-corner grooves (8) are formed in the trapezoidal threads; the outer side of each screw cap is provided with top-horizontal trapezoid-shaped convex threads (9), a plum-blossom-shaped groove (10) is formed in the middle of the screw cap, and is provided with reverse concave threads (11), and the near end of each screw cap is provided with a U-shaped clamp block (12); each screw cap is connected with the corresponding U-shaped clamp block through a movable embedding manner; each connecting rod is a T-shaped rod, the far end of the connecting rod is provided with a main rod (13), and the near end of the connecting rod is provided with a T-shaped handle (14); the tail end of the main rod is provided with a conical tip (15), and the near end of the main rod is provided with a positioning sheet (16); the T-shaped handle is provided with an arc-shaped arm (17); and a connecting rod self-breaking mark (18) is arranged at the joint of the main rod and the arc-shaped arm.

Description

technical field [0001] The invention is applied to clinical orthopedics, is an internal fixation system for thoracolumbar fractures, and belongs to medical equipment. It is used as an internal fixation device for closed reduction and internal fixation of human thoracic and lumbar posterior longitudinal ligament intact but unstable fractures. The application of the device not only helps to reduce the operation trauma, but also helps to reduce the operation and hospitalization time. Background technique [0002] The treatment of thoracolumbar fractures is developing and changing. Roy-Camille et al. began to use pedicle screws and plates for internal fixation of thoracolumbar fractures in 1961. After half a century of clinical application and multi-center research and analysis, it is believed that pedicle screws are effective in treating thoracolumbar fractures. The posterior internal fixation system has also evolved from the nail-plate to the nail-rod system. Surgical trau...

AI Technical Summary

Problems solved by technology

However, obtaining and maintaining closed reduction of the thoracolumbar spine is quite difficult

There are relevant internal fixation devices on the market now, but there is still room for improvement

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