Manufacturing Of Foot Wearable Devices Based On 3D Printing

With the intensification of the aging process,the problem of insufficient medical resources has gradually become prominent.Wearable devices can enhance human body efficiency and monitor physiological parameters,playing a vital role in disease prevention and treatment.The foot is an important organ for supporting weight,wearable devices can reduce the risk of foot injury.In this thesis,foot wearable devices based on 3D printing(including ankle exoskeleton and medical insoles)have been developed for assisted walking and foot ulcer prevention.Firstly,the human walking mechanism is studied,and a single-support phase mathematical model based on the coupled pendulum is established.The motion parameters of the joints are solved by the shooting method,the calculation results with frictional energy consumption are in comparison with natural walking data.According to the switching of the support state before and after the heel striking,the energy loss during the collision process is deduced,and the influence of the elastic element is explored.Secondly,the structural of the foot wearable devices are designed.The ankle exoskeleton uses elastic elements to recover the energy to assist the human body to move forward.The medical insole is divided into soft area and fitting area.The plantar pressure of the forefoot and rearfoot are decreased by low young’s modulus structure of soft area,and fitting area is under the midfoot and shares a part of weight.The medical insole is made of TPU material.Additionally,a plantar pressure acquisition system is developed.The membrane pressure sensors are placed on the characteristic points,which can reflect the pressure change after calibration.The upper computer software and the lower computer software are designed to realize the image display,characteristic analysis and data storage of the pressure information on the computer side through wireless transmission.Finally,the functions of foot wearable devices are verified through experiments.The EMG signals of the calf muscles are collected,verifing that the ankle exoskeleton can reduce the energy loss.The medical insole has a certain pressure reducing effect compared to flat insole.The plantar pressure data obtained by the acquisition system has good periodicity and obvious characteristics,and the gait phase is identified based on the fuzzy output signal.