Lifting locking type polyaxial pedicle screw

Abstract

The invention provides a lifting and locking universal pedicle screw, which includes a screw head installed in a screw seat, a rib is provided on the inner wall of the opening at one end of the screw seat, and a rib at the other end of the screw seat There are two symmetrical arc-shaped openings on the side wall, and the bottom of the arc-shaped opening is provided with a deformation contraction joint; the outer wall of the screw seat is provided with a three-stage fastening groove, and the outer part of the screw seat is covered with a fastening seat, which is tight. The inner edge of the open top of the fixed seat is provided with a fastening clip that can cooperate with the three-stage fastening groove. When the fastening seat moves to the top of the screw seat, the fastening clip contacts the outer wall of the screw seat to make the screw seat squeeze and deform to lock Titanium rods mounted in screw sockets. The invention makes it simple and convenient to repeatedly adjust the titanium rod in the process of fixing the titanium rod, and the final locking and fastening state of the titanium rod is also more stable after repeated adjustments. The arc-shaped opening makes the contact area between the screw seat and the titanium rod larger, and the locking is tighter.

Description

Technical field [0001] The invention belongs to the field of medical equipment, and relates to a screw used in orthopedics, in particular to a universal pedicle screw that does not require a tail cap and can stably fix a titanium rod through a lifting locking mechanism. Background technique [0002] Spinal internal fixation surgery is currently one of the most commonly used methods for clinical treatment of spinal diseases. Pedicle screws are an important part of the spine internal fixation system. Three-column fixation by implanting the vertebral body is a prerequisite for achieving the stability of the entire spine internal fixation system to achieve clinical treatment effects. At present, common pedicle screws can be divided into two categories according to whether the screw head can rotate: directional pedicle screws and universal pedicle screws. Compared with directional pedicle screws, universal pedicle screws have the advantages of simple clinical operation and strong app...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a lifting and locking universal pedicle screw, which overcomes the lack of stability of the existing universal pedicle screw when fixing titanium rods. problem, and at the same time solve the technical problem that the current titanium rod is difficult to adjust

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