Midfield Wireless Powering for Implantable Systems

被引:165
作者
Ho, John S. [1 ]
Kim, Sanghoek [1 ]
Poon, Ada S. Y. [1 ]
机构
[1] Stanford Univ, Dept Elect Engn, Stanford, CA 94035 USA
关键词
Implantable systems; midfield; wireless power transfer; DESIGN; MULTICHANNEL; TELEMETRY; COILS; TRANSMISSION; INDUCTANCE; STIMULATOR; FREQUENCY; SIGNAL; LINK;
D O I
10.1109/JPROC.2013.2251851
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
Efficient wireless power transfer across tissue is highly desirable for removing bulky energy storage components. Most existing power transfer systems are conceptually based on coils linked by slowly varying magnetic fields (less than 10 MHz). These systems have many important capabilities, but are poorly suited for tiny, millimeter-scale implants where extreme asymmetry between the source and the receiver results in weak coupling. This paper first surveys the analysis of near-field power transfer and associated strategies to optimize efficiency. It then reviews analytical models that show that significantly higher efficiencies can be obtained in the electromagnetic midfield. The performance limits of such systems are explored through optimization of the source, and a numerical example of a cardiac implant demonstrates that millimeter-sized devices are feasible.
引用
收藏
页码:1369 / 1378
页数:10
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