External knee prosthesis with four bar linkage mechanism

摘要

This paper describes the design and construction of a prosthetic knee external four-bar mechanism for pelvic limb amputations to transfemoral level . Making process from design and calculations of the software taking biomechanical parameters of a healthy knee ; verifying and comparing the curves obtained with existing jobs. The mechanism was established to support the weight of a person to range between one hundred kilograms , using a finite element analysis it was possible to obtain a safety factor in the prosthesis that will provide peace of mind to the user on a fracture of the device. The construction of the device was using three materials: 6063 aluminum, 304 stainless steel and bronze, making the weight of the prosthesis is not exceeded and make it at the level of the most commercial. Based on the above, there has developed a prosthesis that mimics the motion of the knee, with great stability and at the same time it has a low cost. The device is intended to be incorporated into a modular prosthesis pelvic limb and work in an optimal control mechanism to regulate the acceleration walk.