Analyses on Mechanical Property by Plate-rod System for Scoliosis
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摘要: 为了解决同时测量应用内固定器脊柱侧凸板棍矫正装置矫正过程中椎间盘及椎骨的应力与变形问题,利用相似性原理,建立了脊柱侧凸的实验力学模型。椎骨模型采用铸铝制作,应用电测法测试;椎间盘模型则采用具有双折射性能的聚碳酸脂材料,用光弹法测试。模拟PRSS的工作原理,特制了专用的加载装置及测力系统,给出脊柱在纵向载荷及矫正载荷的联合作用下的应力变化规律。结果表明:当脊柱侧凸发生后,由于纵向载荷作用侧凸有加重的趋势;手术中应用PRSS时,矫正载荷可使脊柱凹侧的压应力减小,在凹侧椎间盘的上下边界出现拉应力,可有效矫正脊柱侧凸。Abstract: To study the mechanical properties of plate-rod system for scoliosis (PRSS), a model of scoliosis and correcting clamp was built on the base of similar principle. According to the factual situation, the distribution of model centrum stress was measured by using photoelastic method and the stain of the spine was tested by strain gauges method simultaneously. The results indicated that compressive stress was formed on the convex side of scoliosis model by the effect of portrait loading. On the other hand, when PRSS was applied, compressive stress of the concave side of model centrum came to little and became tensile stress with transverse correcting loading.
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Keywords:
- photoelasticity /
- strain gauges /
- stress analysis
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