Personalized artificial vertebral body implant based on additive manufacturing and design method thereof

Abstract

The invention relates to the field of medical instruments, and discloses a personalized artificial vertebral body implant based on additive manufacturing. The implant comprises a main artificial vertebral body, and the main artificial vertebral body comprises an inner pore layer and an outer dense layer wrapping the inner pore layer; the inner pore layer is of a pore structure with lightweight design, the porosity of the pore structure is 75-80%, the pore diameter is 500-700 microns, the upper and lower end faces of the inner pore layer are provided with four nail placing holes respectively, the four nail placing holes form two nail channels, and the thickness of the outer dense layer is larger than 2 mm. The invention further discloses a design method of the personalized artificial vertebral body implant based on additive manufacturing. By means of the personalized artificial vertebral body implant based on additive manufacturing and the design method thereof, the physiological curvature can be reconstructed and accurately matched with a bone defect area, and the sacralization and long-time bone stability of patients are facilitated.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a personalized artificial vertebral body implant based on additive manufacturing and a design method thereof. Background technique [0002] The vertebral body is the main load-bearing part of the spine. The interior is filled with cancellous bone, the cortical bone on the surface is thin, and the upper and lower sides are rough. It is connected to the adjacent vertebrae by the intervertebral fibrocartilage. The posterior edge of the vertebral body is slightly depressed and is surrounded by the vertebral arch. Formed into vertebral foramen, each vertebral foramen runs through to form the spinal canal to accommodate the spinal cord. [0003] At present, the classic reconstruction method for large bone defects caused by spinal tumors is to use titanium mesh to fill bone grafts plus anterior plate and screw fixation or posterior pedicle screw fixation. Among them, the titanium mesh is...

AI Technical Summary

Problems solved by technology

Long-term follow-up found that the postoperative long-term stability of this reconstruction technique was not satisfactory, the main reason being that the titanium mesh for anterior reconstruction was manually made by the surgeon during the operation, and the contact surface between the upper and lower vertebral body bone It is difficult to form a good matching relationship between them, and complications such as long-term fixation failure such as titanium mesh tilt, displacement, subsidence, titanium plate screw or pedicle screw pullout and displacement are prone to occur after surgery, and severe cases require a second preoperative surgery and / or posterior decompression and fixation

In addition, both the anterior titanium plate and the titanium mesh adopt a uniform manufacturing process, lacking a titanium plate that matches the anatomical shape, and the intraoperative shaping of the titanium mesh depends entirely on the operator’s surgical experience, and cannot achieve an accurate match with the reconstructed area. requirements, increase the operation time, increase the blood loss during operation, increase the possibility of intraoperative infection, and increase the possibility of heart, lung, liver and kidney diseases and various complications in patients with poor basic conditions and (or) elderly patients. incidence of disease

[0004] In summary, there is an urgent need for a better design method for the reconstruction of bone defects in spinal tumors, which can ensure the exact matching of the physiological curvature of the reconstruction area and the bone contact surface, and is conducive to the bone fusion and long-term restoration of patients. Stable, and this kind of artificial vertebral body is still relatively rare

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