This book demonstrates the designs, experimental results and models of the energy harvesting system using piezoelectric smart materials for self-power generation in prosthetics. This book covers energy harvesting, electro-mechanical energy, dynamic analysis, piezoelectric composites, piezoelectric flexible film, macro fibre composites, experimental setup, simulations, converter and rectifier. The effect of the capacitor in the harvester circuit was also investigated. This helps to store energy effectively with low leakage. The PZT has been employed and embedded in the prosthesis to improve the prosthetic geometric parameters, beam, mass and the resistive electric loads which significantly influence the output power. This book introduces a new type of self- power generation prosthetics.