脊柱后路椎弓根固定系统轴向力学研究
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1.西南医科大学附属医院 骨与关节外科;2.四川省骨科置入器械研发及应用技术工程实验室;3.西南医科大学附属医院 临床医学研究中心;4.西南医科大学附属医院 病理科

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R 318.01

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the Axial Mechanical Property Analysis of the Posterior Spinal Pedicle Fixation System
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    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,为优化改进脊柱后路椎弓根固定系统轴向力学性能提供基础。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YY/T 0961-2014标准,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。 结论 根据理论分析和试验结果可以得出:组件顶出刚度单轴锥体钉系统的刚度明显高于多轴锥体钉系统的刚度;组件扭转刚度JHL-V型锥体钉系统略高于JHL-I型锥体钉系统;影响椎弓根系统轴顶出力的主要因素是锁紧螺栓的型号及尺寸和锁紧螺栓的锁紧力矩;影响椎弓根系统轴向力矩的主要因素是除锁紧螺栓因素外,还有连接棒的直径;可通过增加连接棒直径、增加各个连接元件间的摩擦系数、增加锁紧螺栓的中径的措施来提高椎弓根系统的轴向力学性能。 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了参考和方向。

    Abstract:

    Objective To provide the basis for optimizing and improving the axial mechanical performance of the posterior pedicle fixation system. The factors that affect the axial mechanical performance of the posterior pedicle fixation system have been Analyzed. Methods The paper establishes a mechanical model of the axial mechanical properties of the posterior pedicle fixation system and performs mechanical analysis. Referring to the YY/T 0961-2014, the axial ejection force test and the axial clamping torque test of JHL-I multi-axis components, JHL-I single-axis components, JHL-V multi-axis components and JHL-V single-axis components are tested through Instron E3000 and Instron E10000. Results According to theoretical analysis and test, The component-ejection-rigidity of the single-axis has been significantly higher than that of the multi-axis; The component-torsion-rigidity of JHL-V has been higher than that of JHL-I; The type and size of the locking bolt and the locking torque of the locking bolt have been the main factors affecting the axial ejection force of the posterior spinal pedicle fixation system; The size of the locking bolt and the diameter of the connection rod have been the main factors affection the axial clamping torque of the system; The axial mechanical properties of the system can be improved by increasing the diameter of the connecting rod, increasing the coefficient of friction between each connecting element, and increasing the pitch diameter of the locking bolt. The research results have provided references and directions for optimizing and improving the axial mechanical properties of the posterior pedicle fixation system.

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  • 收稿日期:2020-09-15
  • 最后修改日期:2020-10-31
  • 录用日期:2020-11-03
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