脊柱后路椎弓根固定系统轴向力学研究  

Axial Mechanical Properties of the Posterior Spinal Pedicle Fixation System

作　　者：梁成 王冠 刘晋珲 段可 鲁晓波 鲁梦婕 LIANG Cheng;WANG Guan;LIU Jinghui;DUAN Ke;LU Xiaobo;LU Mengjie(Department of Bone and Joint Surgery,the Affiliated Hospital of Southwest Medical University,Luzhou 646000,Sichuan,China;the Clinical Medicine Research Center,the Affiliated Hospital of Southwest Medical University,Luzhou 646000,Sichuan,China;Department of Pathology,the Affiliated Hospital of Southwest Medical University,Luzhou 646000,Sichuan,China;Sichuan Provincial Laboratory of Orthopaedic Engineering,Luzhou 646000,Sichuan,China)

机构地区：[1]西南医科大学附属医院骨与关节外科,四川泸州6460OO [2]西南医科大学附属医院临床医学研究中心,四川泸州6460OO [3]西南医科大学附属医院病理科,四川泸州6460OO [4]四川省骨科置入器械研发及应用技术工程实验室,四川泸州646000

出　　处：《医用生物力学》2021年第2期195-200,共6页Journal of Medical Biomechanics

基　　金：泸州-西南医科大学联合课题(2020LZXNYDF02);西南医科大学课题(2019ZQN051)。

摘　　要：目的分析影响脊柱后路椎弓根固定系统轴向力学性能的因素。方法建立脊柱后路椎弓根固定系统轴向力学性能的力学模型,并进行力学分析;参考标准YY/T 0961-2014,采用Instron E3000和Instron E10000力学试验机对JHL-Ⅰ型多轴组件、JHL-Ⅰ型单轴组件、JHL-Ⅴ型多轴组件和JHL-Ⅴ型单轴组件进行轴向顶出力测试和轴向夹紧扭矩测试。结果组件单轴椎体钉系统的顶出刚度明显高于多轴椎体钉系统;组件JHL-Ⅴ型椎体钉系统扭转刚度略高于JHL-Ⅰ型椎体钉系统。影响椎弓根系统轴顶出力的主要因素是锁紧螺栓的型号、尺寸以及锁紧力矩;影响椎弓根系统轴向力矩的主要因素是锁紧螺栓尺寸和连接棒的直径;可通过增加连接棒直径、增加各个连接元件间的摩擦系数、增加锁紧螺栓中径的措施来提高椎弓根系统的轴向力学性能。结论研究结果为优化改进脊柱后路椎弓根固定系统的轴向力学性能提供参考。Objective To analyze factors that affect axial mechanical performance of the posterior pedicle fixation system.Methods The mechanical model for axial mechanical properties of the posterior pedicle fixation system was established to perform mechanical analysis.By referring to the Standard YY/T 0961-2014,tests on axial ejection force and axial clamping torque of JHL-I multi-axis components,JHL-I single-axis components,JHL-V multi-axis components and JHL-V single-axis components were performed by using Instron E3000 and Instron E10000 mechanical testing machines.Results The ejection rigidity of the single-axis component of vertebral nail system was significantly higher than that of the multi-axis component of vertebral nail system;the torsion rigidity of JHL-V was higher than that of JHL-I.The type and size of the locking bolt as well as its locking torque were the main factors affecting axial ejection force of the posterior spinal pedicle fixation system;the size of the locking bolt and the diameter of the connection rod were the main factors affecting axial clamping torque of the system;axial mechanical properties of the system could be improved by increasing the diameter of the connecting rod,the coefficient of friction between each connecting element,and the pitch diameter of the locking bolt.Conclusions The research findings provide references for optimizing and improving axial mechanical properties of the posterior pedicle fixation system.

关 键 词：脊柱后路椎弓根固定系统 轴向顶出力 轴向夹紧力矩 组件刚度 

分 类 号：R318.01[医药卫生—生物医学工程]