Research on the Gait Phase Analysis Method of Femoral Amputation Patients Based on the Thin Film Pressure Sensor

The running-in of amputees and prostheses usually requires a long time. Many objective evaluation parameters must be obtained to fit prosthetic orthoses on the amputees. Hence, in this paper, a method for analyzing the gait phase of femoral amputation patients based on thin-film pressure sensors is proposed. First, the distribution of pressure sensing points is determined by evaluating different residual limb muscle contraction degrees. The wearable pressure information acquisition system device is used for walking data acquisition. Once data acquisition is completed, the original data is denoised by wavelet transformation. Then, the time domain features are extracted by analyzing the data curve. Finally, feature values are input into the support vector machine algorithm model for step-by-step state phase classification identification. According to the experimental results, the wearable pressure information acquisition system designed in this study can be used to detect the gait phase. Lastly, the proposed gait phase analysis method can provide more information about prosthetics and broaden the evaluation index of prosthetic orthotics.