假肢步态实验平台设计

背景:目前对于假肢的评价还停留在主观感受,缺乏一套客观的评价系统,建立模拟人体运动的在线假肢参数检测系统对于假肢性能的评价、假肢研究设计具有重要意义。目的:实现假肢的多种步态运动,并通过运动学、动力学数据的比对,评价其仿真程度。方法:根据仿生学原理,将下肢假肢简化成四杆四轴的力学模型,利用采集得到的多种步态模式,驱动下肢假肢运动,并搭建动态力学测试平台,实时测量假肢运动的地面垂直反力和前后剪力。结果与结论:假肢步态运动,髋膝关节的变化曲线与正常步态数据相一致,而其地面垂直反力与前后剪力也与正常人体相接近。提示假肢步态实验平台模拟了下肢假肢步态运动,并实时采集假肢运动的多项运动学、动力学参数,具备较高的仿真程度。

Design of a prosthetic gait experimental platform

BACKGROUND: At present, the evaluation of prosthesis stays in subjective feelings, lacking of an objective evaluation system. To set up the online prosthetic parameters detection system of body motion is of great significance to the evaluation of the prosthetic performance and design of prothesis. OBJECTIVE: By realizing various gait patterns of lower limb prosthesis and performing analysis of kinematics and dynamics data, to evaluate its simulation degree. METHODS: According to the principle of bionics, we simplified the lower limb prosthesis into a four-bar and four-axis mechanical model. Using various gait patterns, the platform drove prostheses walking. We built a dynamical test platform which measured ground counterforce and the shear stress in real-time. RESULTS AND CONCLUSION: During the gait movement of prostheses, the data curve of hips and knees was in accordance with normal gait data, and the ground counterforce and the shear stress were also close to those of the normal people. The prosthetic gait experimental platform stimulates the lower limb prosthesis gait movement, and acquires a number of kinematics and dynamics parameters in real-time, with a high simulation degree.