Transcutaneous ultrasound energy harvesting using capacitive triboelectric technology
Transcutaneous ultrasound energy harvesting using capacitive triboelectric technology
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DOI：
10.1126/science.aan3997
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发表时间：
2019-08-02
期刊：
影响因子：
56.9
通讯作者：
Kim, Sang-Woo
中科院分区：
文献类型：
--
作者：
Hinchet, Ronan;Yoon, Hong-Joon;Kim, Sang-Woo
植入式医疗系统的主要挑战是包含或可靠地输送电力。我们使用超声波通过皮肤和液体传递机械能，并展示了一种能够有效采集机械能的薄植入式振动摩擦发电机。超声波可以诱导聚合物薄膜发生微米级位移，通过接触起电产生电能。我们在水中以每秒166微库仑的速度给锂离子电池充电。通过超声能量转移离体产生的电压和电流在猪组织下达到2.4伏和156微安。这些研究结果表明，电容摩擦电驻极体是第一个能够与压电竞争的技术，以在体内采集超声并为医疗植入物供电。
A major challenge for implantable medical systems is the inclusion or reliable delivery of electrical power. We use ultrasound to deliver mechanical energy through skin and liquids and demonstrate a thin implantable vibrating triboelectric generator able to effectively harvest it. The ultrasound can induce micrometer-scale displacement of a polymer thin membrane to generate electrical energy through contact electrification. We recharge a lithium-ion battery at a rate of 166 microcoulombs per second in water. The voltage and current generated ex vivo by ultrasound energy transfer reached 2.4 volts and 156 microamps under porcine tissue. These findings show that a capacitive triboelectric electret is the first technology able to compete with piezoelectricity to harvest ultrasound in vivo and to power medical implants.