Fixer with stereo grids for vertebra facet joint fusion

Abstract

The present invention provides a fixer with stereo grids for vertebra facet joint fusion. The fixer is integrally formed from metal powder by an additive manufacturing method and is inserted between an upper facet joint and a lower facet joint of two adjacent vertebras. The fixer comprises a first fusion side and a second fusion side, opposite to each other. The stereo grids are mounted on the first fusion side and the second fusion side. Each stereo grid is provided with a plurality of micro-holes in multi-packed shape. For the design, when the fixer is planted between the upper facet joint and the lower facet joint of two adjacent vertebras, it expands the two adjacent vertebras. Besides the improvement in the narrowed symptom of vertebras, newly born bone cells can enter the plurality of micro-holes in multi-packed shape in the stereo grids with the result of making the two adjacent vertebras fused better.

Description

technical field [0001] The present invention relates to a spinal facet joint fusion fixator with a three-dimensional mesh body, in particular, three-dimensional mesh bodies are respectively provided on the first fusion surface and the second fusion surface on opposite sides, the three-dimensional mesh body The body is composed of many micropores in the form of multilayer stacks. Background technique [0002] The human spine is composed of multi-segmented vertebral bodies. Between two adjacent vertebral bodies, the upper facet joint and the lower facet joint are used as fulcrums, so that the human body can bend forward or stretch backward during exercise. However, degeneration with age, long-term bad posture or external force will cause the loss of cartilage tissue between the two adjacent upper and lower facet joints and the wear and tear of the upper and lower facet joints, resulting in symptoms of soreness and discomfort in patients ; In addition, for patients with spinal...

AI Technical Summary

Problems solved by technology

However, since the outer diameter of bone cells is usually about 50 μm, when sintering beads are formed on the surface of the bone cells by sintering, the sintering beads are arranged in random numbers and rely on each other during molding, and the diameters of the sintering beads are different. Therefore, the pores formed between the sintered beads may be smaller than the particle size of the bone cells, forming pores that are not suitable for the growth of new bone cells, resulting in new bone cells that can only attach to the sintered beads formed by the implant or rough The outermost surface of the surface cannot enter the implant in the form of a knotted root, which will affect the effect of fusion with the patient's spine, and it is obviously necessary to improve

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