An expandable fusion device with adjustable bone grafting height

Abstract

The invention discloses a bone-grafting height-adjustable opening-type fusion cage. The bone-grafting height-adjustable opening-type fusion cage comprises a support, a sliding block and a supporting platform, wherein the first slant grooves are formed in the two sides of the back surface of the front end of the support, a positioning square groove is formed in top of the back end of the support, aguiding hole is formed in the back end in the horizontal direction, and a slant groove rail is arranged on the inner side face of the support; the sliding block is arranged on the front of the back end in the support, second slant grooves are formed in the two sides of the front end of the sliding block, the sliding block is in threaded connection with the back through a threaded rod, a limitinggroove corresponding to the positioning square groove is formed in a rod head of the threaded rod, and limiting plates are clamped into the limiting groove and the positioning square groove through the rod head of the threaded rod and are locked and connected with the support; the supporting platform comprises an upper supporting platform body and a lower supporting platform body, and the slidingblock moves for driving the upper supporting platform body and the lower supporting platform body to slide along the slant groove rail, the first slant grooves and the second slant grooves to achieveopening movement and closing movement of the supporting platform. The bone-grafting height-adjustable opening-type fusion cage is high in stability, and can adapt to adjustment of intervertebral spaceheights of different segments.

Description

technical field [0001] The invention relates to the field of endoscopic fusion devices, in particular to an expandable fusion device capable of adjusting bone grafting height. 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, intervertebral bone gra...

AI Technical Summary

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

[0008] At the same time, the gap between the connecting components of the existing fusion device is too large, and the supporting platform is easy to swing; and the trapezoidal design of the supporting platform of the fusion device has the disadvantage that the contact surface between the side of the fusion device support platform and the fusion device shell is too small, resulting in the fusion device in the Poor stability when performing opening and closing actions, which affects the implant effect

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