Artificial vertebra by anterior pedicle screw fixation and positioning assembly tool

Abstract

The invention provides an artificial vertebra by anterior pedicle screw fixation and a positioning assembly tool. The artificial vertebra is characterized in that a pedicle screw fixing hole is formed in the artificial vertebra, and the screw is accurately guided to fix the artificial vertebra on two bilateral vertebral pedicles to realize firm self-stabilization. According to the artificial vertebra, a steel plate can be integrated into the artificial vertebra according to requirements, upper and lower ends of the steel plate exceed the length of the artificial vertebra, or only the upper end of the steel plate is longer than the artificial vertebra; the long end of the steel plate is provided with a screw hole coaxial with the vertebral pedicle and a screw hole oriented to the pedicle; a drill positioning guide plate and an osteotomy guide plate are simultaneously provided to ensure that an anterior pedicle screw can be safely and accurately implanted; and the artificial vertebra as well as the drill, osteotomy guide plate and other assembly tools thereof are designed and printed by utilizing a 3D printing technology based on medical imaging data. By adopting the artificial vertebra, the fixing strength of anterior spine stability can be maximized safely and quickly.

Description

technical field [0001] The invention belongs to the field of medical instruments, in particular to an artificial vertebral body and a positioning and installation tool for anterior pedicle screw fixation. Background technique [0002] Stable reconstruction surgery is required after cervical spine tumor, tuberculosis, trauma and other lesions are removed. At present, autologous bone or allogeneic bone or artificial bone, or titanium mesh or artificial vertebral body is usually used to support the defect, and then the plate is fixed with locking screw on the lower vertebral body. However, because the vertebral bodies are all cancellous bone and the anterior and posterior diameters are short, only about 15mm screws can be used. Therefore, the fixation strength is weak, and it needs to be fixed with a neck brace for several months. Especially in the case where the screw-fixed vertebral body itself also has lesions or the reconstruction segment is longer, the fixation effect is...

AI Technical Summary

Problems solved by technology

However, due to the lack of anatomical landmarks on the surface of the vertebral body, important structures such as the vertebral artery, spinal cord, or nerve root are easily accidentally injured during screw placement; in addition, the intersection angle between the screw and the plate is relatively large, and the tail end of the locking screw often protrudes above the plate. on the back wall of the esophagus, hindering the peristalsis produced by the esophagus and pharynx, causing congestion and edema of the back wall of the esophagus, and then leading to esophageal fistula

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