A Wireless powered LED marker for Intraoperative Localization

Abstract

Intraoperative Localization plays an important role in achieving a safe and successful resection surgery. Conventionally, Intraoperative Localization techniques rely on intraoperative imaging guidance, radioactivity guidance, and fluorescence guidance together with local markers. These techniques can assist the surgeon by accurately finding the lesion in the operating room. In this article, an idea of using wireless powered LED marker as a more intuitive alternative is proposed, mainly inspired by the rapid developments in microelectronics and wireless power transfer techniques. This paper presents a complete system using a wireless powered LED marker that can be used for intraoperative localization. The operating frequency and source current density distribution were determined based on the Mid-field wireless power transfer theory. The results were simulated with muscle and multilayered breast tissue model in FEKO. During implementation, the transmitter is approximated by using a two-port antenna which operates at around 2Ghz. The size of the LED marker was minimized by using a double layer PCB design. The energy harvesting component is a 5-turn coil, which reduces the resonant frequency of the entire marker when it is wound around the PCB. The PCB is coated with biocompatible material. Finally, the system is tested and verified using media of air, tissue simulating liquid, butter, and swan lung tissue. It can be concluded that this system can potentially increase the convenience and accuracy of intraoperative localization.