Interbody fusion cage

Abstract

The invention provides an interbody fusion cage used for being disposed into vertebral body gaps. The interbody fusion cage comprises a fusion cage body and an expander. A bone grafting groove is formed in the fusion cage body. The expander is arranged in the bone grafting groove, and comprises an expanding device and an adjusting device for adjusting the expanding device. The expanding device hasan initial state and an expansion state. In the initial state, the expanding device can be completely accommodated in the bone grafting groove, and in the expansion state, the expanding device can extend out of the bone grafting groove after expansion. By the adjusting device, the expanding device can be switched from the initial state to the expansion state and is nailed into vertebral bodies. The interbody fusion cage has the advantages that the fusion cage can be immediately fastened between the upper vertebral body and the lower vertebral body, the anti-slip effect and the support effectcan be guaranteed, pedicle screw fixation can be avoided, and surgical difficulty and risk are reduced; the interbody fusion cage can support the vertebral bodies effectively, has a good support function, and can be prevented from being influenced by blocking of intervertebral disk tissues and residual end plate cartilages; the fixation effect is good, and the anti-slip function of the interbody fusion cage is guaranteed effectively.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an intervertebral fusion device. Background technique [0002] The intervertebral fusion device is placed in the intervertebral space after the lumbar intervertebral disc is removed to restore the height of the intervertebral space, support the load of the upper and lower vertebral bodies, and integrate the upper and lower vertebral bodies into one. The existing straight intervertebral fusion device has been clinically verified for many years and is an effective and safe device. However, due to the concave shape of the upper and lower terminal surfaces of the vertebral body, the height of the intervertebral space is short at both ends and long in the middle. Coupled with the differences in the individual, age, and physical condition of patients, the bone surfaces of the upper and lower endplates of the intervertebral space are irregular. The existing intervertebral f...

AI Technical Summary

Problems solved by technology

However, on the one hand, after opening, only the front end of the cage body contacts the endplate bone surface of the vertebral body, which reduces the bearing surface of the cage, and the supporting effect is poor; on the other hand, considering the obstruction of intervertebral disc tissue and residual endplate cartilage, In addition, the front end of the fusion cage generally has no dentate protrusion, and the expanded fusion cage has insufficient anti-slip function and the function of stabilizing the upper and lower vertebral bodies. In addition, considering that the front end of the intervertebral space is connected by the annulus fibrosus and the anterior longitudinal ligament, the increase in the height of the intervertebral space is limited. This makes the front end of the fusion cage easy to be restricted during the opening process, causing the fusion cage to slide back as a whole, exacerbating the risk of slippage, and pedicle screws are still required for fixation

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