Adjustable interbody fusion cage

Abstract

An adjustable interbody fusion cage is characterized by comprising a cage body (1) and an adjusting screws (2). The cage body (1) is provided with a screw hole segment (11) and an opening segment (12). One adjusting screw (2) is provided with a screw segment (21) and an expansion segment (22). When the adjustable interbody fusion cage is in use, the adjustable interbody fusion cage in a closing state is placed into a vertebral body clearance, the screw segment (21) of the adjusting screw (2) is screwed into the screw hole segment (11) of the cage body (1) gradually, the expansion segment (22) of the adjusting screw (2) allows the opening segment (12) of the cage body (1) to expand gradually to open the vertebral body clearance to the required height, so that the purposes of correcting vertebral sequence and restoring good spine physiological curvature can be achieved.

Description

technical field [0001] The invention relates to the field of orthopedic implants, and more particularly relates to an adjustable intervertebral fusion device for fusion between vertebral bodies of the spine. Background technique [0002] In the field of spinal surgery, intervertebral fusion devices are used for degenerative spondylolisthesis, traumatic spondylolisthesis, segmental instability, discogenic low back pain, acute disc herniation with spinal cord or nerve damage, old spinal injury with spinal cord compression, etc. Spinal segment fusion is one of the most widely used treatment methods at present. The intervertebral fusion cage has the functions of support, compression, and load sharing, and can better restore the height of the intervertebral space and the physiological curvature of the spine. At the same time, reliable bony fusion can be obtained by implanting autologous or allogeneic bone particles. Its clinical The efficacy has been confirmed by a large number ...

AI Technical Summary

Problems solved by technology

At present, conventional intervertebral fusion cages are mostly made of medical metal or polymer biomaterials, and are designed in different shapes, thicknesses, and wedge angles to meet the different physiological parameters of patients, which can meet the needs of most operations, but there are still Some defects lead to unsatisfactory results of surgery for some patients, such as:

[0003] 1. In patients with severe osteoporosis, due to insufficient effective cross-sectional area of ​​the intervertebral fusion cage, the intervertebral fusion cage may sink into the adjacent vertebral body and lose the ideal intervertebral body height and physiological curvature of the spine;

[0004] 2. Secondary adjustments cannot be made after implantation;

[0005] 3. In the fusion of deformed vertebral bodies in patients with congenital scoliosis, conventional intervertebral fusion devices are difficult to adapt to the irregular height and angle of the intervertebral space

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