Lateral mass fixing device of pedicle screw

Abstract

The invention discloses a lateral mass fixing device of a pedicle screw. The lateral mass fixing device comprises a coupling nut, a jackscrew component, a universal arm and an arm locking fixing nail, wherein the coupling nut is used for combining a bolt base, and a vertical bar is arranged between the coupling nut and the screw base; the jackscrew component is located above the coupling nut, and the jackscrew component and the coupling nut are movably arranged; the universal arm is provided with an arm near end part, an arm far end part and a connecting part, the arm near end part is provided with long waist-shaped holes, the long waist-shaped holes are formed in a mode of surrounding the outer side of the rod part of the jackscrew and is located between the head of the jackscrew and the upper part of the nut, and the arm far end part is provided with an arm locking fixing hole; the arm locking fixing nail is matched with the arm locking fixing hole so as to make the universal arm and a cervical vertebra vertebral plate fixedly connected. The lateral mass fixing device of the pedicle screw has the advantages that through the connection between four parts of the coupling nut, the jackscrew component, the universal arm and the arm locking fixing nail and the pedicle screw of a dentata (or an inferior cervical vertebrae), the pedicle screw of the dentata (or the inferior cervical vertebrae) has a stronger withdrawal force.

Description

technical field [0001] The invention relates to internal fixation in spinal surgery, in particular to a lateral mass reinforcement device for pedicle screws, which is applied to atlantoaxial surgery or lower cervical spine surgery. Background technique [0002] There are 7 cervical vertebrae, the first cervical vertebra is also called the atlas, the second cervical vertebra is also called the axis vertebra, and the seventh cervical vertebra is also called the long vertebra. The first and second cervical vertebrae are collectively called the upper cervical vertebrae, and the third to seventh cervical vertebrae are collectively known as the lower cervical vertebrae. Posterior cervical screw-rod internal fixation can achieve atlantoaxial reduction through instrumental reduction during surgery, and screw-rod fixation has good biomechanical stability, so it is widely used in spinal surgery. The instrumental reduction mentioned above refers to partial reduction of the atlantoaxia...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of insufficient axial screw pull-out force during the reduction in the existing atlantoaxial screw-rod system; it can also be used to overcome the problem of decreased pull-out force of cervical screws caused by osteoporosis or failure of the first screw placement ( Including axis, lower cervical spine)

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