Stable intervertebral fusion cage

Abstract

The invention relates to a stable intervertebral fusion cage comprising an upper portion, a middle portion (7), and a lower portion; the upper portion comprises two bar shaped bodies (5) arranged at an interval along the long side face direction of the middle portion (7), the two bar shaped bodies (5) are respectively located on two edges of the top end face of the middle portion (7), and a long inlet groove (6) is arranged between the two bar shaped bodies (5); the two opposite long side faces of the middle portion (7) are respectively provided with a groove (8) distributed in the long side face direction; the lower portion comprises two bar shaped bodies (9) arranged at an interval along the long side face direction of the middle portion (7), the two bar shaped bodies (9) are respectively located on two edges of the bottom end face of the middle portion (7), and a long inlet groove (10) is arranged between the two bar shaped bodies (9); the upper and lower portions are respectively made of porous metal material, and fixed with the middle portion (7)so as to form a whole body. The stable intervertebral fusion cage is simple in structure, light in weight, proper in elastic modulus, and can realize self-stability.

Description

technical field [0001] The invention relates to an intervertebral fixation device, in particular to a stable intervertebral fusion device. Background technique [0002] Clinically, implantation of an artificial intervertebral fusion device is often used to treat intervertebral disc herniation and intervertebral instability caused by spinal degeneration. Although this kind of operation can obtain relatively satisfactory curative effect, the effect of intervertebral fusion is greatly limited due to the following defects in the commonly used intervertebral fusion device: bulky product, strong foreign body sensation after implantation, complicated structural design, The structure is relatively cumbersome; the elastic modulus of the product is relatively high, and the gap between the elastic modulus of the product and the vertebral body is too large, which will cause stress shielding in the later stage, resulting in bone absorption, bone degeneration, and abnormal movement or deg...

AI Technical Summary

Problems solved by technology

[0004] As a multi-level porous material for bionic artificial bone, the material itself needs to be uniform in application, that is, the pore size and distribution are uniform, so that the performance is uniform, but in fact, the existing multi-level porous materials cannot meet this requirement. The layout of the level holes is random, the size and connectivity of the pores are uncontrollable, the distribution of the pores is not uniform, and there are internal defects, which cannot meet the functional requirements as a bionic bone restoration.

For example, although some materials claim to have achieved high uniformity, their uniformity is still the uniformity at the large volume scale. The three-dimensional body of centimeters, measured its mass separately, and the difference in the degree of inhomogeneity is still very large, so the various properties of the porous material such as strength, elastic modulus, stress distribution, etc. are inhomogeneous, which seriously affects its function.

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