Assembled total intervertebral disc prosthesis based on 3D printing technology and making method thereof

Abstract

The invention discloses an assembled total intervertebral disc prosthesis based on a 3D printing technology. The prosthesis comprises an upper backing plate, an upper plate, a lower plate and a lowerbacking plate which are detachably connected in sequence from top to bottom, wherein a buffer gasket is arranged between the upper plate and the lower plate; the upper backing plate and the lower backing plate are made through 3D printing; the upper surface of the upper backing plate and the lower surface of the lower backing plate are matched with the end faces of the adjacent intervertebral spaces for predetermined installation of the prosthesis respectively; and the upper backing plate and the lower backing plate are both of porous structures. The invention further discloses a making methodof the assembled total intervertebral disc prosthesis based on the 3D printing technology. The defects in the prior art can be overcome, and high-quality prosthesis-end plate interface osseointegration is achieved; and the 3D printing method adopted by the invention can be better matched with the vertebral end plate form of the human body, so that the operation difficulty of end plate grinding and the like in an operation is reduced, the technical requirements of the intervertebral disc replacement operation are reduced, the technical popularization can be better carried out, and more patients can be served.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a modular total intervertebral disc prosthesis based on 3D printing technology. Background technique [0002] Clinically, it has been found that after artificial cervical disc replacement, the prosthesis and the endplate are not well fitted. [0003] The design concept of cervical disc replacement (CDR) is to complete cervical discectomy and decompression in the spinal canal, and at the same time preserve the range of motion of the surgical segment to simulate the normal physiological motion of the cervical spine to the greatest extent and reduce the fusion of adjacent segments. Acceleration occurs. Mid-term follow-up reports of several multi-center prospective clinical randomized controlled trials approved by the US FDA suggest that CDR successfully preserves the range of motion of the surgical segment, and its overall curative effect is better than or at least not inferior to an...

AI Technical Summary

Problems solved by technology

[0007] 1) After the endplate is polished, the strength of the endplate is destroyed, the support strength of the endplate decreases, and the risk of postoperative prosthesis subsidence increases, which is not conducive to osseointegration;

[0008] 2) The bone debris produced after grinding destroys the shape of the bony endplate, and the western part of the bone formation and tissue exposure will increase the incidence of postoperative heterotopic ossification

[0010] The existing intervertebral disc replacement technology and intervertebral disc prosthesis have technical deficiencies: it is impossible to perform intervertebral disc replacement surgery on patients with hyperplasia and degeneration of the uncinate joint, because once the hyperplasia and degeneration of the uncinate joint is performed, once the uncinate joint is removed and decompressed, on the one hand it may Bone debris will be generated during the grinding and resection, which will stimulate osteogenesis and increase the incidence of postoperative heterotopic ossification; on the other hand, after resection of the uncinate joint, the stability of the cervical spine may be damaged, resulting in postoperative cervical dislocation of the patient. Complications, severe cases can cause paralysis and death of the patient; therefore, the surgical indications of the existing intervertebral disc replacement technology are relatively narrow, and are only suitable for some patients with no obvious osteophytes and simple soft protrusions, and cannot treat patients with severe uncinate joint hyperplasia. having a disc replacement

[0013] 1. The cycle from personalized design to production is long, the cost is high, and it is not conducive to large-scale production;

[0014] 2. In terms of wear resistance and mechanical strength of 3D printed implants, there are still some deficiencies compared with traditional processing techniques

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