Posterior spinal reconstruction device used after laminectomy

Abstract

The invention relates to a posterior spinal reconstruction device after laminectomy. The posterior spinal reconstruction device comprises a semi-arc vertebral plate body adopting 3D printing, whereinthe vertebral plate body is divided into two layers, the inner layer is a compact layer, the periphery of the outer layer is a compact layer, the center is a porous structure layer with the porosity of 50-80% and the pore diameter of 400-800 [mu]m, and the vertebral plate body adopting 3D printing adopts a mixture of polycaprolactone and tricalcium phosphate in the mass ratio being 2 to (8-5)to 5as the main raw material. The artificial vertebral plate is integrally designed through a 3D printing technology, and the formability is high. A porous structure is printed at the middle of the outerlayer of the vertebral plate, bone cells can crawl and grow into a stent after cancellous bone filling, and osseointegration and bone reconstruction of the stent are facilitated. Vertebral plate splicing teeth are printed on the edge of the vertebral plate and the joints of upper parts and lower parts and used for transverse and longitudinal assembly of the artificial vertebral plate. A fixing groove is printed in the outer side edge of the vertebral plate and can be buckled to a pedicle screw tail to complete fixing. The raw material adopted for vertebral plate printing is a completely-degradable polycaprolactone and tricalcium phosphate mixture, and the in-vivo complete degradation time is about 2-3 years.

Description

technical field [0001] The invention relates to a medical device, in particular to a device for reconstructing a posterior spinal path after laminectomy. Background technique [0002] Spinal stenosis is a disease in which the volume of the spinal canal decreases due to various reasons, thereby compressing the dural sac, spinal cord or nerve roots, resulting in a series of neurological symptoms such as pain, numbness, and weakness of the limbs. Decompressive laminectomy can effectively solve this clinical problem by removing the lamina, exposing the lamina and removing the lesion in the spinal canal. After the laminectomy, the structure of the posterior column of the spine is destroyed, resulting in instability of the spine. At the same time, the spinal cord and dural sac are exposed due to the loss of the protection of the laminae. In some patients, scar tissue forms behind the defect area, which grows into the spinal canal defect area, causing restenosis, and adhesion to t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method that can solve the problem of restenosis of the spinal canal caused by spinal instability and scar adhesion after laminectomy. By filling the resection site with a 3D printed artificial lamina, on the one hand, it will produce a shielding effect and prevent surgery. The tissue behind the posterior spinal cord grows in; on the other hand, the degradation of the lamina occurs synchronously with the formation of bone, and finally completes the bony remodeling of the lamina

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