一种新型髋离断外动力假肢的设计方法

A new design method of power hip disarticulation prosthesis

为解决当前髋离断假肢在使用过程中存在的步态不对称问题,本研究提出了一种新型髋离断外动力假肢的设计方法。基于理论模型分析了造成假肢使用者步态不对称的原因,采用双平行四边形连杆机构将假肢的旋转中心定位在患者残肢髋臼,并依靠电机提供曲髋过程中的动力补偿。实验结果表明,患者佩戴传统髋离断假肢确实存在步态不对称问题,而该新型假肢髋关节角度变化更接近健侧髋关节角度的周期变化。该研究证实了提高髋离断假肢旋转轴心与健侧旋转轴心重合度是提高假肢使用者步态对称的关键,对提高佩戴髋离断假肢使用者的生活质量有重要意义。

We designed a new power hip disarticulation prosthesis to solve the problem of gait asymmetry existing in usage of hip dissected prostheses.The asymmetry of prosthetic user′s gait was analyzed based on the theoretical model.The center of the prosthesis rotation was positioned in the acetabulum of the patient′s residual limb through a double parallelogram linkage structure.Among them,the dynamic compensation during hip curvature was provided by the motor.The experimental results showed that the subject had obvious asymmetrical gait when used traditional hip prosthesis.In addition,the changes in the angle of the hip joint when the subject weared the new prosthesis were closer to the periodic changes in angle of the hip joint on the healthy side.The study confirmes that the key to the gait symmetry of prosthetic users is to increase the coincidence of the rotation axis of the hip disarticulation prosthesis with the rotation axis of the healthy contralateral side,which is of great significance to improve the life quality of of patients wearing hip disarticulation prostheses.