用于无线植入式神经刺激器的电流体耦合供电
Galvanic Body-Coupled Powering for Wireless Implanted Neurostimulators
AI总结：
本文针对无线植入式神经刺激器的供电需求，提出基于电流耦合的体耦合供电（G-BCP）系统设计方法，通过优化电极配置提升靶向精度与传输效率，模拟原型在1.25GHz下实现>20%的PTE，为外周神经刺激提供高效供电方案。
摘要：
体耦合供电（BCP）是一种创新的无线电能传输（WPT）技术，近期因可向神经和肌肉刺激器等前沿生物医学植入物供电的潜力而受到探索。本文展示了通过电流耦合（G-BCP）嵌入BCP的WPT系统的高效设计技术。G-BCP配置使用围绕目标身体区域的两个金属圆环作为电流（差分）激励所需的发射（TX）电极，无线植入物作为接收（RX）端，相应配备两个电极用于差分电能接收。该方法具有增强的靶向精度、更高的电能传输效率（PTE）和良好的组织穿透特性等独特优势，使其成为传统WPT方法的更优替代方案。本文进行了全面分析，以获得优化的器件参数，同时允许植入物在不同深度和对准状态下灵活放置。为验证所提出的设计概念，在Ansys HFSS中模拟了一个原型，采用半径10mm的多层组织介质，针对大鼠坐骨神经。令人印象深刻的是，当植入物（RX电极半径=1mm）位于组织模型内2mm深处、负载阻抗为Rload=1000欧姆和Cload=5皮法时，该原型在1.25GHz下实现了>20%的PTE。因此，基于G-BCP的无线供电微型设备被视为神经记录和刺激（尤其是外周神经系统）的关键推动因素，可提升治疗效果和患者体验。
英文摘要：
Body-coupled powering (BCP) is an innovative wireless power transfer (WPT) technique, recently explored for its potential to deliver power to cutting-edge biomedical implants such as nerve and muscle stimulators. This paper demonstrates the efficient technique of designing WPT systems embedding BCP via galvanic coupling (G-BCP). The G-BCP configuration utilizes two metal circular rings surrounding the body area of interest as the transmitter (TX) electrodes required for galvanic (differential) excitation and a wireless implant as the receiver (RX) equipped with two electrodes for differential power reception accordingly. By focusing on the unique advantages of this approach - such as enhanced targeting accuracy, improved power transfer efficiency (PTE), and favorable tissue penetration characteristics, G-BCP emerges as a superior alternative to traditional WPT methods. A comprehensive analysis is conducted to obtain the optimized device parameters while simultaneously allowing flexible placement of implants at different depths and alignments. To substantiate the proposed design concept, a prototype was simulated in Ansys HFSS, employing a multi-layered tissue medium of 10mm radius and targeting the sciatic nerve of a rat. Impressively, this prototype achieves > 20% PTE at 1.25 GHz, with the implant (radius of RX electrodes = 1 mm) located 2 mm deep inside the tissue model having complex load impedance of Rload = 1000 Ohm and Cload = 5pF. Therefore, the G-BCP-based wirelessly powered microdevices are envisaged to be a key enabler in neural recording and stimulation, specifically for the peripheral nervous system, enhancing therapeutic outcomes and patient experiences.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
