Design, Analysis, and Simulation of a Low Size Ultrasonic Piezoelectric Micro-Generator for Implantable Biosensors

This paper presents a new piezoelectric-based ultrasonic micro-generator to supply the required power of implantable medical devices in the human body. Unlike previous ones, this structure uses sound waves with higher frequency to extract energy. Despite the smaller dimensions, the extractable power of the micro-generator was increased. Using aluminum nitrate instead of toxic materials such as PZT in the structure of the designed microgenerator made it more compatible with the human body and the environment. The presented design occupies only 15.7×10-6 cm3 and can produce 260 μW under the applied acoustic pressure of 1000 Pa at the frequency of 1.158 MHz. Various simulations were performed in the COMSOL software to evaluate the performance of the proposed micro-generator. In addition, simulation results were verified by the values obtained from the theoretical and numerical analyses. According to the obtained results and other salient features, the proposed structure is a suitable candidate for use in implantable medical devices in the human body.