一种智能膝关节假肢及其步态对称性评价

A microprocessor-controlled prosthetic knee and its gait symmetry assessment

目的提出一种评价智能膝关节假肢步态对称性的方法。方法设计智能膝关节假肢样机AiKneeOne以及可穿戴式步态数据采集系统。以步态周期中第一次双脚支撑时间、单脚支撑时间、第二次双脚支撑时间和摆动相时间作为参数,计算对称指数(SI)和对称指标比率RⅠ、RⅡ评估步态对称性指标。5例健康人模拟穿戴AiKneeOne,以0.5、0.7、1.1 m/s速度在平板上行走,采用可穿戴式下肢步态数据采集系统采集数据,进行实测。结果不同速度下,第一次双脚支撑和第二次双脚支撑时,SI和RⅡ绝对值较低、RⅠ接近1,对称性较好;单脚支撑和摆动相时,对称性有待提高。结论智能膝关节假肢AiKneeOne具备重建截肢者步态的潜力,步态对称性指标可用于智能膝关节假肢穿戴性能评估测试。

Objective To present a method for evaluating the gait symmetry of microprocessor-controlled prosthetic knee(MPK).Methods A kind of proto-MPK,AiKneeOne,and a wearable gait collect system,were made.The phases of the first double-limb support,the single-limb support,the second double-limb support,and the swing were used to calculate symmetry index(SI),ratioⅠ(RI)and ratio II(RII).Five heathy persons walked on the treadmill wearing Ai‐KneeOne at speeds of 0.5,0.7,1.1 m/s,and the indice were collected with the wearable gait collect system.Results Under different velocities,The absolute value of SI and RII were very little and the RI were close to one at the phases of the first double-limb support and the second double-limb support,but they were not very satisfactory in the phases of the single-limb support and the swing.Conclusion The developed MPK AiKneeOne is potential to reconstruct the gait of amputees,and the gait symmetry indice can be used to evaluate the wearing performance of MPK.