Wireless power transfer-based single layer inductive coupling for biomedical implantable devices.

Implanted biomedical devices (IBDs) help patients make their lives easier by continuously monitoring undesired signs and detecting their diseases. However, the operation of these IBDs relies on battery power, which often suffers from a limited lifespan. Wireless power transfer (WPT) is a promising solution for this challenge. WPT technology facilitates the wireless recharging of IBD batteries, thus eliminating the need for surgical battery replacement procedures. This paper introduces a near-field inductive coupling-based WPT (IC-WPT) system operating within the 13.56 MHz radio band, explicitly designed for IBD applications. Various single-layer spiral coil topologies were precisely created and simulated, including octagonal, circular, and rectangular configurations. The design and simulation of these coils were carried out using the finite element-based ANSYS HFSS software. The investigation of the IC-WPT system showed the effect of the distance and frequency on the coupling between the implanted coil and transmitter coils and system efficiency. Results demonstrated that the rectangular coil achieved higher transfer efficiency, ranging from 84.4% at a 2 mm distance to 71.9% at a 10 mm distance compared to octagonal and circular coils. The model confirms its effectiveness based on the result of the proposed IC-WPT. [ABSTRACT FROM AUTHOR]