Wireless Power Transfer and Adaptive Energy Management in Intracranial BCI Implants

This article explores the critical challenge of powering intracranial brain-computer interface (BCI) implants, emphasizing that while these systems offer superior signal quality, their long-term viability is hindered by the limitations of batteries and the infection risks of wired connections. To address this, the author reviews various wireless power transfer (WPT) technologies, particularly inductive and resonance-based electromagnetic methods, while highlighting the biophysical hurdles such as tissue heating (SAR), signal attenuation by the skull, and the necessity for extreme miniaturization. The paper argues that open-loop systems are insufficient due to unpredictable power fluctuations caused by head movements and anatomical variability; instead, it advocates for closed-loop systems with real-time feedback, power-data co-design strategies like backscatter communication, and scalable architectures for distributed microscale implants to ensure clinical safety and operational stability.