Biomechanical Design and Simulation of an Active Ankle-Foot Prosthesis Based on the Human Ankle Behavior

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 377

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شناسه ملی سند علمی:

ISME24_652

تاریخ نمایه سازی: 21 مهر 1398

چکیده مقاله:

Lower extremity amputation constitute high percentage of limb amputation which significantly reduce the motion ability and quality of life of the amputees. Therefore the most important goal in the design of prosthesis is to restore function of the lost limb. Most of the commercially available ankle-foot prostheses are passive and thus cause many gait problems for below knee amputees, such as high metabolic demand, poor shock tolerance and asymmetric gait patterns. Even though several powered prostheticdevices have been designed and proposed to improve amputee walking experience by exploiting active elements, these designs yet suffer from heavy and bulky actuators which is necessary to produce the power of propulsion. In this paper, we try to design a new prosthesis that overcomes these challenges. The main idea is to store energy during the complete stance phase and release it at push off using a combination of springs and a low power actuator. Thus, the prosthesis can provide high mechanical power efficiency and can generate the same natural ankle torque, utilizing a small and light actuator. Moreover, the ankle stiffness is also realized based on the characteristics of a human sound ankle, in each phase of walking. The performance of the designed prosthesis, is verified by a MATLAB/SimMechanics simulation. The results indicate that themechanism perfectly follows the torque—angle and the power—gait cycle characteristics of a normal ankle.

نویسندگان

Leila Ghorbanil

Engineering Department, University aflsfahan

Parinaz Shokrani

Department af Biomedical Engineering, Amirkabir University of Technology

Hamid Sadeghian

Engineering Department, University oflsfahan;