Ultrasonic Power Transfer in Biomedical Implants using Flexible Transducer

Biomedical implants, considered as a remarkable breakthrough in the field of medical science has been evolving gradually over the past few decades. However, charging them through batteries is a major issue due to their short lifespan and bulky nature. Therefore, to eliminate the use of batteries Ultrasonic Power Transmission (UPT) technology is perceived as the ideal technique for charging implants. This paper proposes an optimum computational model of the UPT system employing PVDF (polyvinylidene fluoride) based transducer. It was simulated at an optimum frequency of 900 kHz that resulted in an acoustic pressure of 218 Pa at the transmitting end. At a depth of 3 cm, the simulated model is able to generate a maximum output voltage of 0.13 volts and an energy density of 4.21 µJ/m3 at the receiver output. The proposed UPT model on a PVDF (polyvinylidene fluoride) substrate facilitates higher flexibility, superior biocompatibility with light-weight structure and stable mechanical property.