脊柱三维运动测试实验装置的研制

目的研制一套模拟人体脊柱在体运动的离体加载装置,进行脊柱生物力学实验研究。方法利用轴承原理,在加载盘上设计安装旋转锁定装置,加载时旋转于所需测试位置后用螺栓锁定状态,再通过万能材料试验机提供自动加载动力源,在脊柱标本上施加前屈/后伸、左/右侧弯和左/右轴向旋转6个方向的纯力矩,模拟脊柱的在体运动,并用三维扫描仪对脊柱标本加载前后位置进行扫描测量。利用该加载装置对6具1岁龄猪颈椎(C2-C6)在6种加载状态下进行运动范围测量,并对该加载装置进行精度验证和误差分析。结果建立了一套人体脊柱三维运动实验装置,6具猪颈椎标本经加载测量得到6个方向的中性区和活动范围数据,总测量误差值小于3.5%。结论该装置巧妙的设计较好地模拟了脊柱在体运动,可实现人体脊柱的快速加载,费用低、方法简单实用,能大大提高实验的效率,在脊柱的离体加载方面具有较大的推广应用价值。

Development of an experimental device for measuring three-dimensional movement of the spine

Objective To develop a set of loading device that can simulate the spinal movement in vitro so as to carry out the biomechanical experiment on human spine.Methods Based on the principle of bearing,the rotary locking device was designed and fixed on the loading plate,which was rotated to the position for testing and then locked by the bolt before loading.And then,with the auto-loading power provided by the universal testing machine,the pure moment of flexion/extension,left/right bending and left/right axial ...