Full built-in expandable anterior spinal fixation system

Abstract

The invention relates to a full built-in expandable anterior spinal fixation system, belongs to the field of medical appliances, and is applicable to an anterior spinal fixation operation. The full built-in inflatable anterior spinal fixation system consists of a connecting bar (1), a screw plug (2), an expandable bolt body (3) and an expandable element (4), and is characterized in that: the expandable element (4) is of a step rod shape, threads and an internal hexagonal hole are formed on the head part of the expandable element (4), and the other end of the expandable element (4) is of a conical shape; the expandable bolt body (3) is of a hollow structure and provided with inner threads, and threads and grooves are formed on the outer surface of the expandable bolt body (3); a U-shaped groove is formed on the tail part of the bolt body, and a hole is formed on the tail part of the bolt body. After a disease spine and adjacent spines are exposed, the expandable bolt body (3) is implanted, upper and lower intervertebral discs of the disease spine are cut and scraped with a curet; the expandable element (4) is screwed into to support the spinal gap, the connecting bar (1) is selected, a titanium mesh is cut, broken bones are implanted into the titanium mesh, and the titanium mesh is driven into the spinal gap, the connecting bar (1) is arranged, the screw plug (2) is tightened, and the long tail of the expandable bolt body (3) is broken, so that full built-in is realized.

Description

technical field [0001] The invention relates to a fully built-in expandable anterior spinal internal fixator system, which belongs to the field of medical equipment and is suitable for operations such as anterior spinal internal fixation. Background technique [0002] Anterior surgical decompression is a common method for the treatment of spinal cord compression caused by thoracolumbar trauma, tumors, infections and other diseases. After decompression, anterior internal fixation is required to stabilize the spine. Early anterior fixation had problems such as poor biomechanical properties, unreasonable shape and structure, and difficult technical operation. In recent years, the research on anterior thoracolumbar implants has achieved rapid development, and it has been improved in the direction of adapting to the normal anatomical structure of the human body, being able to withstand normal biomechanical loads of the spine, having good tissue compatibility, and reducing the imp...

AI Technical Summary

Problems solved by technology

But its bendable steel cable can only resist tension, and at the same time, the elastic connection of the instrument can easily cause the cable or screw to break, which in turn causes the formation of a false joint.

In the 1970s, Hall and Micheli, Zielke and Pellin improved this system by changing the steel cable into a steel rod, but the system was used to correct and fix scoliosis, and the original design could not resist total or subtotal vertebral body cutting. pressure load on the front of the spine

The disadvantages of this device are: the design area replaces most of the spine, the implantation is more forward, and the notch of the device is high, it is easy to contact the large artery in front, leading to the formation of aneurysms, and severe cases can lead to the death of the patient

Nail-and-rod systems such as the Kaneda system are widely used clinically and are relatively stable in biomechanics, but the device is relatively large in size and has a high built-in notch. It has been reported clinically that the friction of the Kaneda system on the aorta leads to the occurrence of delayed aortic aneurysms. Although rare, the consequences can be serious

The Z-plate system solves the problem of high notch of the screw-rod system to a certain extent, but the biomechanical stability of the Z-plate is worse than that of the screw-rod system, and the plate and the side of the vertebral body cannot be completely conformed, leaving a gap, resulting in The stress is concentrated at the locking place between the screw and the plate, which makes the internal fixation invalid; the design of the same plate determines that it cannot be adapted to some patients with irregular vertebral bodies, and cannot be pre-bent according to intraoperative needs

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