Transpedicular vertebral body fracture reducer

Abstract

The invention provides a vertebral body resetter, which comprises a head, a main body and a tail. The head includes a hinge structure comprising at least two sets of hinges, each set of hinges comprising at least four interconnected hinge pieces. During the distraction process of the vertebral body reducer, the head functions as a skeleton, which is spontaneously arranged to form an arc and is stereoscopically distracted in all directions. The umbrella-shaped head design of the present invention can cause the vertebral body to be stretched in the sagittal and coronal directions, and a negative pressure cavity is formed in the horizontal direction to accommodate the bone fragments protruding into the spinal canal and relieve the compressive damage to the spinal nerve. The umbrella-shaped space can effectively increase the contact area and better integrate with bone cement or bone graft materials, thereby reducing the risk of broken nails and rods after surgery.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a transpedicle vertebral body fracture reducer. Background technique [0002] Thoracolumbar fractures are currently the most common spinal trauma in spinal surgery. The thoracolumbar vertebral body is the turning point of thoracic kyphosis and lumbar lordosis, and has a large range of motion, so it is most vulnerable to damage caused by conductive violence. It is characterized by the involvement of the middle column of the spine. Under the action of axial stress, the vertebral body bursts like a burst. Fractures on the posterior side of the vertebral body often protrude into the spinal canal together with the intervertebral disc tissue, causing spinal canal stenosis, resulting in spinal cord or cauda equina injury. In the past two decades, the clinical treatment of thoracolumbar fractures has become more and more mature, and active surgical treatment has become the main trend. Post...

AI Technical Summary

Problems solved by technology

[0003] 1) The operator usually uses postures after anesthesia to reset the height of the vertebral body, which cannot achieve satisfactory endplate reset;

[0004] 2) For bone cement implantation without a reducer, its diffusion method cannot reach the designated reduction area, and the strength of the dough stage cannot support the reduction endplate;

[0005] 3) When filling the bone cavity in the non-resetting state, high pressure in the cavity is generated due to the narrow cavity and residual bone fragments, which often leads to blockage of bone cement injection and failure;

[0006] 4) Insufficient reduction of bone graft space, resulting in less bone graft volume, small bone graft contact surface, low postoperative long-term fusion rate, and easy to cause loosening and fracture of internal fixation;

[0007] 5) At present, most of the reduction devices have too many defects, the distraction strength and the reduction height of the vertebral body are not ideal, and the reduction device is often broken, damaged and difficult to remove during the operation, which has a great impact on the surrounding tissues, and even secondary spinal cord injury

Reduces the retention of the balloon and long-term radiation, but the operation is complicated and expensive

In addition, during the expansion process, the distribution of each release pressure is uneven and uncontrollable, which may cause insufficient stretching of the parts that need to be stretched, or excessive stretching of the parts that do not need to be stretched, causing damage and increasing long-term complications. disease risk

[0013] Dong Yang, Shanghai Sixth People's Hospital, designed the vertebral body resetter by himself. Although the brain is freed from the balloon, the duckbill structure at the head end cannot be spaced apart, point-shaped, and cannot increase contact. area, which increases the difficulty of bone cement fusion and increases the risk of broken nails and rods after surgery

At the same time, it will cause bone fragments to get stuck in the front opening, making it impossible to recycle.

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