An artificial vertebral body fixed by anterior pedicle screw and positioning installation 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 equipment, in particular to an artificial vertebral body and a positioning installation tool for anterior pedicle screw fixation. Background technique [0002] After resection of cervical tumors, tuberculosis, trauma and other lesions, stable reconstruction surgery is required. At present, autologous bone, allogeneic bone or artificial bone, or titanium mesh or artificial vertebral body are used to support the defect, and then locking screws are used to fix the plate on the reserved area. on the lower vertebral body. However, since the vertebral body is all cancellous bone and the anteroposterior diameter is relatively short, only screws with a diameter of about 15 mm can be used. Therefore, the fixation strength is weak, and it needs to be fixed for several months with a neck brace. Especially in the cases where the vertebral body fixed by the screw itself has lesions or the reconstruction segment is lon...

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

Images