Personalized artificial vertebral implant and its design method based on additive manufacturing

Abstract

The invention relates to the field of medical devices, and discloses a personalized artificial vertebral body implant based on additive manufacturing, which includes an artificial vertebral body body, and the artificial vertebral body body includes an inner pore layer and an outer dense layer that wraps around the inner pore layer , the internal pore layer is a lightweight design pore structure, the porosity of the pore structure is 75% to 80%, the pore diameter is 500 to 700 μm, and the upper end surface and the lower end surface of the internal pore layer are respectively provided with two nail holes. Four nail holes form two nail tracks, and the thickness of the outer dense layer is greater than 2mm. The invention also discloses a design method for a personalized artificial vertebral body implant based on additive manufacturing. The invention is based on the personalized artificial vertebral body implant and its design method based on additive manufacturing, which can reconstruct the physiological curvature and accurately match with the bone defect area, and contribute to the bone fusion and long-term stability of the patient.

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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