High‐Efficiency Multicoil Wireless Power and Data Transfer for Biomedical Implants and Neuroprosthetics

To eliminate the transcutaneous wires between the external power source and the implanted device, and to achieve a long lifetime of the implanted device, most commercial devices use wireless power transfer (WPT) to the implanted electronics. WPT also removes the need for implantable batteries or cabling requirements, making biomedical implants more practical. The overall design goals of WPT for biomedical implants and, therefore, the goals considered in this chapter are small size of the coil implanted in the body, low loss in the receiver, and high efficiency and power delivery. The chapter describes the use of multicoil systems in efficient power delivery to the implanted receiver, dealing with the new design techniques to achieve better performance over conventional designs of multicoil system. The chapter also describes inductive data transfer and explores how a simple update to the proposed technique enhances performance parameters at the data transmission frequency which can help in better data signal delivery.