An expandable fusion device with adjustable height of intermediate bone graft

Abstract

The invention relates to a fusion instrument under a mirror, in particular to a distractable fusion cage with the adjustable middle bone grafting height. The distractable fusion cage comprises a supporting platform, a support and an adjusting assembly, adopts an internal hollow and external hollow design, has a large bone grafting space and facilitates bone grafting, so that the stability of the lumbar vertebra can be better established and maintained after the fusion cage is implanted, the parallel distracting function of the fusion cage main body can be achieved, the lifting height is increased, the distractable fusion cage adapts to the heights of intervertebral spaces of different segments, the application range is wide, and the overall cost is low.

Description

technical field [0001] The invention relates to an endoscopic fusion instrument, in particular to an expandable fusion device capable of adjusting the height of intermediate bone grafts. Background technique [0002] Intervertebral fusion technology is the main method for the treatment of intervertebral diseases. It is widely used in lumbar spine instability, degeneration, trauma, tumor, and infection. It can remove the painful intervertebral disc and provide strong fusion and fixation between lumbar segments to maintain The load-bearing function of the lumbar spine can also restore the height of the intervertebral space, expand the intervertebral foramen, and relieve or relieve nerve root compression. The principle of surgical treatment is to fully decompress and maintain spinal stability, the purpose is to remove the compression and stimulation caused by protrusions, and to eliminate or relieve clinical symptoms. Through anterior and posterior lumbar surgery, intervertebr...

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Problems solved by technology

[0007] The disadvantages of this type of expandable fusion cage are: although the main body of this type of fusion cage can adapt to the height or area of ​​the intervertebral space of different segments, the range of distraction height is limited, and the volume is generally large, and it is more generally suitable for open surgery. The volume fusion cage damages the original stable structures such as the articular process and intervertebral disc fibrous ring too much, resulting in spinal instability. After surgery, nail rods must be added for fixation, which not only increases the difficulty of the operation, prolongs the operation time, and increases the operation cost, but also damages the nerve root. There is also a greater chance of injury

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