Design of A Flexion-Extension Coupling Ratio Mechanism for Orthotics and Prosthetics

• Main Authors: Chun-Hua Ho, 何駿驊
• Other Authors: 李志中
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/10668652120745175223

碩士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The main purpose of this research is to design a set of hip flexion-extension coupling ratio mechanism for paraplegic and HD/HP patients. In clinical experiences, the treatment for paralysis of lower extremities and HD/HP patients is the most challenging issue. Compared with knee joint mechanism, the hip joint needs novel design in priority. The hip mechanism of reciprocating gait orthosis (RGO) can only apply flexion/extension motion. The limitation leads to patients’ compensatory movement. So the mechanism needs to have the ability to adjust higher flexion-extension coupling ratio(FECR) automatically for different phases. First, we use Lagrange equation to establish simple human model. By substituting different initial conditions, the solution can be used to design higher hip coupling ratio mechanism which is better than conventional mechanism. In practical application, we investigate the real coupling ratio and the influence of 1:1 coupling ratio mechanism on normal people by motion analysis method. We find that the abnormal constrain may be one of the main reason of slow walking speed. Finally, we give suggestions for more mature mechanism which can work stably on subjects in the future.