腰椎后路经皮动态内固定系统的研制及力学测试

发布时间：2018-02-13 21:45

本文关键词： 腰椎微创动态内固定研制力学测试　出处：《南华大学》2015年硕士论文　论文类型：学位论文

【摘要】：目的研制一种新型的腰椎后路可经皮微创置入的动态内固定系统,阐明其结构,原理及特点。并通过对该系统的动态内固定棒进行力学测试,对比坚强固定棒,探讨其在下腰椎疾病中的临床应用价值。方法1.腰椎后路经皮动态内固定棒的研制:提出新型动态内固定棒的设计思路,委托器械公司加工制造样品。2.新型腰椎后路微创动态内固定棒与坚强内固定棒的力学测试比较:随机抽取5根微创动态内固定棒与5根坚强固定棒作为受试对象,分组进行抗压、拉伸、扭转试验(包括正转与反转)。由材料力学试验机分别加载不同程度的负荷,记录微创动态内固定棒与坚强内固定棒组在不同程度载荷下的抗压程度、拉伸程度、扭转程度,并绘制力变曲线,将数据输入计算机处理分析,比较其差异。结果1.在抗压试验中,加载生理负荷范围下,微创动态内固定棒的屈曲活动度为15°,较坚强固定棒活动度大,微创动态固定棒组与坚强固定棒组在屈曲活动度方面存在显著差异,差异有统计学意义(P0.05)。2.在拉伸试验中,加载生理负荷范围下,微创动态固定棒的位移活动度为0.48mm,较坚强固定棒活动度大,微创动态固定棒组与坚强固定棒组在伸展活动度方面存在显著差异,差异有统计学意义(P0.05)。3.在扭转试验中,加载生理负荷范围下,微创动态固定棒的扭转活动度为6.11°,较坚强固定棒活动度大,微创动态固定棒组与坚强固定棒组在扭转活动度方面存在显著差异,差异有统计学意义(P0.05)。结论1.该系统的设计符合微创理念。2.该动态内固定系统具有良好的稳定性,同时可部分保留固定节段的活动度,通过力学测试表明其抗压、拉伸、扭转活动度优于坚强固定棒,符合动态固定的理念。
[Abstract]:Objective to develop a new dynamic internal fixation system with percutaneous minimally invasive posterior approach for lumbar vertebrae, and to clarify its structure, principle and characteristics. To explore the clinical application value of Lumbar vertebrae disease. Methods 1.The development of posterior lumbar vertebrae percutaneous dynamic internal fixation rod: a new design idea of dynamic internal fixation rod was put forward. The mechanical test of new lumbar spine posterior minimally invasive dynamic internal fixation rod and rigid internal fixation rod were compared: 5 dynamic internal fixation rods and 5 rigid internal fixation rods were randomly selected as subjects. The compression resistance, tension and torsion tests (including positive rotation and reverse rotation) were carried out in groups. Different degrees of load were loaded by the material mechanics test machine respectively, and the compressive resistance of the groups of micro-invasive dynamic internal fixation rods and strong internal fixation rods were recorded under different degrees of load. Tensile degree, torsion degree, and draw force change curve, input the data into computer processing analysis, compare its difference. 1. In the pressure test, under the range of physiological load, The flexion activity of the minimally invasive dynamic fixation rod was 15 掳, which was larger than that of the rigid one. There was a significant difference in the flexion activity between the minimally invasive dynamic fixation rod group and the strong fixed rod group, and the difference was statistically significant (P 0.05). 2. In the tensile test, there was a significant difference between the two groups. In the range of physiological load, the displacement activity of the minimally invasive dynamic fixation rod was 0.48 mm, which was larger than that of the strong fixed rod group. There was significant difference in the stretching activity between the minimally invasive dynamic fixed rod group and the strong fixed rod group. In the torsion test, the torsional activity of the micro-invasive dynamic fixator was 6.11 掳, which was higher than that of the rigid one. There was significant difference in torsion activity between the minimally invasive dynamic fixed rod group and the strong fixed rod group, and the difference was statistically significant (P 0.05). Conclusion 1. The design of the system accords with the minimally invasive concept. 2. The dynamic internal fixation system has good stability. At the same time, the motion of the fixed segment can be partially retained. The mechanical tests show that the range of motion of the fixed segment is superior to that of the rigid fixed rod, and accords with the concept of dynamic fixation.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R687.3

【相似文献】