Expandable interbody fusion cage

Abstract

The invention provides an expandable interbody fusion cage which comprises a cuboid-like fusion cage body, an expanding lock arranged inside the cuboid-like fusion cage body, an adjusting pull rod connected to the expanding lock in a threaded manner, and a lock cap. The fusion cage body is composed of an adjusting end head and an expanding portion, the expanding portion is formed by an upper expanding body and a lower expanding body which are opening-shaped, an implanting end head is arranged at an opening end of the expanding portion, each of the upper surface of the upper expanding body and the lower surface of the lower expanding body is provided with a load-bearing face with antiskid teeth and coincident with a human endplate in curvature, bone implanting holes in upper-lower correspondence are formed in the middles of the upper expanding portion and the lower expanding portion respectively, two side faces, perpendicular to the load-bearing face, of the expanding portion form arc-shaped adjusting grooves, and the inner diameter of each arc-shaped adjusting groove is reduced stepwise from the implanting end head to the adjusting end head. Stepped adjusting is realized by adopting the stepwise arc-shaped adjusting grooves, convenience is brought to interbody fusion surgery quantization, and the expandable interbody fusion cage is simple and convenient to use and operate and ideal in physiological lordosis restoration of lumbar vertebra.

Description

technical field [0001] The invention relates to the field of medical instruments, and more particularly, relates to an expandable intervertebral fusion device used in intervertebral fusion operations. Background technique [0002] Lumbar interbody fusion is commonly used to treat conditions such as lumbar degeneration and instability. It can restore intervertebral height, enlarge the intervertebral foramen, support the anterior column, and increase the stability of the fused segment. In the late 1970s, the research on the intervertebral fusion device began, and it was later used to treat diseases such as lumbar degenerative changes and lumbar instability. The support of the anterior column has been strengthened to increase the stability of the fusion segment. [0003] In recent years, many kinds of intervertebral fusions of different shapes and materials have been used clinically, and the two most commonly used ones are cylindrical threaded fusions and box-shaped fusions. ...

AI Technical Summary

Problems solved by technology

Extensive surgical trauma and increased surgical costs due to the need for an additional pedicle screw system for fixation

In addition, after vertebral body fusion, the recovery of lumbar physiological lordosis is not ideal

[0006] From the above, it can be known that the cylindrical thread cage and the existing box-shaped cage can increase the stability of the lumbar spine in the directions of forward flexion and left and right lateral flexion, but cannot increase the stability of extension. Directional stability is also significantly reduced

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