Omnidirectional Wireless Power Transfer for Millimetric Magnetoelectric Biomedical Implants

被引:0
|
作者
Wang, Wei [1 ]
Yu, Zhanghao [1 ]
Zou, Yiwei [1 ]
Woods, Joshua E. [1 ]
Chari, Prahalad [1 ]
Su, Yumin [1 ]
Robinson, Jacob T. [1 ]
Yang, Kaiyuan [1 ]
机构
[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA
基金
美国国家科学基金会; 美国国家卫生研究院;
关键词
Coils; Implants; Magnetic fields; Couplings; Magnetoelectric effects; Sensors; Wireless power transfer; Ultrasonic imaging; Sensitivity; Inductive coupling; Bioelectronics; implantable device; magnetoelectric (ME); omnidirectional; wireless power transfer (WPT); STIMULATION; SYSTEMS; DESIGN;
D O I
10.1109/JSSC.2024.3464533
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Miniature bioelectronic implants promise revolutionary therapies for cardiovascular and neurological disorders. Wireless power transfer (WPT) is a significant method for miniaturization, eliminating the need for bulky batteries in today's devices. Despite successful demonstrations of millimetric battery-free implants in animal models, the robustness and efficiency of WPT are known to degrade significantly under misalignment incurred by body movements, respiration, heart beating, and limited control of implant orientation during surgery. This article presents an omnidirectional WPT platform for millimetric bioelectronic implants, employing the emerging magnetoelectric (ME) WPT modality, and "magnetic field steering" technique based on multiple transmitter (TX) coils. To accurately sense the weak coupling in a miniature implant and adaptively control the multicoil TX array in a closed loop, we develop an active echo (AE) scheme using a tiny coil on the implant. Our prototype comprises a fully integrated 14.2 mm $<^>3$ implantable stimulator embedding a custom low-power system-on-chip (SoC) powered by an ME film, a TX with a custom three-channel AE RX chip, and a multicoil TX array with mutual inductance cancellation. The AE RX achieves $-$ 161 dBm/Hz input-referred noise with 64 dB gain tuning range to reliably sense the AE signal, and offers fast polarity detection for driver control. AE simultaneously enhances the robustness, efficiency, and charging range of ME WPT. Under 90 $<^>{\circ}$ rotation from the ideal position, our omnidirectional WPT system achieves 6.8 $\times$ higher power transfer efficiency (PTE) than a single-coil baseline. The tracking error of AE negligibly degrades the PTE by less than 2% from using ideal control.
引用
收藏
页码:3599 / 3611
页数:13
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