Lifting locking type polyaxial pedicle screw

Abstract

The invention provides a lifting locking type polyaxial pedicle screw, which comprises a screw head arranged in a screw seat, wherein a convex edge is arranged on the inner wall of an opening formed in one end of the screw seat; two symmetrical circular arc-shaped openings are formed in the side wall of the other end of the screw seat; a deformation contraction joint is formed in the bottom of the circular arc-shaped opening; a three-stage fastening groove is formed in the outer wall of the screw seat; a fastening seat sleeves the outer part of the screw seat; the open top inner edge of the fastening seat is provided with a fastening clamp head capable of being matched with the three-stage fastening groove; when the fastening seat moves towards the top of the screw seat, the fastening clamp head is in contact with the outer wall of the screw seat so that the screw seat extrudes and deforms for locking a titanium bar arranged in a screw seat. The repeated regulation of the titanium bar in the titanium bar fixing process becomes simple and convenient; through the multi-time repeated regulation, the final fastening state of the titanium bar is stable and firm. A circular arc-shaped opening is used, so that the contact area between the screw seat and the titanium bar is 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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