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Ultrasound-Induced Wireless Energy Harvesting for Potential Retinal Electrical Stimulation Application

机译：超声诱导的无线能量收集在潜在的视网膜电刺激中的应用

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摘要

Retinal electrical stimulation for people with neurodegenerative diseases has shown to be feasible for direct excitation of neurons as a means of restoring vision. In this work, a new electrical stimulation strategy is proposed using ultrasound-driven wireless energy harvesting technology to convert acoustic energy to electricity through the piezoelectric effect. The design, fabrication, and performance of a millimeter-scale flexible ultrasound patch that utilizes an environment-friendly lead-free piezocomposite are described. A modified dice-and-fill technique is used to manufacture the microstructure of the piezocomposite and to generate improved electrical and acoustic properties. The as-developed device can be attached on a complex surface and be driven by ultrasound to produce adjustable electrical outputs, reaching a maximum output power of 45 mW cm(-2). Potential applications for charging energy storage devices and powering commercial electronics using the device are demonstrated. The considerable current signals (e.g., current 72 mu A and current density 9.2 nA mu m(-2)) that are higher than the average thresholds of retinal stimulation are also obtained in the ex vivo experiment of an implanted environment, showing great potential to be integrated on implanted biomedical devices for electrical stimulation application.
机译：对患有神经退行性疾病的人进行视网膜电刺激已显示出直接刺激神经元作为恢复视力的方法是可行的。在这项工作中，提出了一种新的电刺激策略，该策略使用超声驱动的无线能量收集技术通过压电效应将声能转换为电。描述了利用环境友好的无铅压电复合材料的毫米级柔性超声贴片的设计，制造和性能。改进的切块和填充技术用于制造压电复合材料的微观结构，并产生改进的电和声特性。可以将已开发的设备安装在复杂的表面上，并通过超声驱动以产生可调节的电输出，从而达到45 mW cm（-2）的最大输出功率。演示了为储能设备充电并使用该设备为商用电子设备供电的潜在应用。在植入环境的离体实验中，也获得了高于视网膜刺激平均阈值的相当大的电流信号（例如，电流> 72μA和电流密度> 9.2 nAμm（-2）），显示出潜在地集成在植入的生物医学设备上以进行电刺激应用。

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  • 来源
    《Advanced Functional Materials》 |2019年第33期|1902522.1-1902522.13|共13页
  • 作者

    Jiang Laiming; Yang Yang; Chen Ruimin; Lu Gengxi; Li Runze; Xing Jie; Shung K. Kirk; Humayun Mark S.; Zhu Jianguo; Chen Yong; Zhou Qifa;

  • 作者单位

    Univ Southern Calif, Keck Sch Med, Roski Eye Inst, Los Angeles, CA 90033 USA|Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610064, Sichuan, Peoples R China;

    Univ Southern Calif, Viterbi Sch Engn, Dept Aerosp & Mech Engn, Epstein Dept Ind & Syst Engn, Los Angeles, CA 90089 USA|San Diego State Univ, Dept Mech Engn, 5500 Campanile Dr, San Diego, CA 92182 USA;

    Univ Southern Calif, Viterbi Sch Engn, Dept Biomed Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Viterbi Sch Engn, Dept Biomed Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Keck Sch Med, Roski Eye Inst, Los Angeles, CA 90033 USA|Univ Southern Calif, Viterbi Sch Engn, Dept Biomed Engn, Los Angeles, CA 90089 USA;

    Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610064, Sichuan, Peoples R China;

    Univ Southern Calif, Viterbi Sch Engn, Dept Biomed Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Keck Sch Med, Roski Eye Inst, Los Angeles, CA 90033 USA;

    Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610064, Sichuan, Peoples R China;

    Univ Southern Calif, Viterbi Sch Engn, Dept Aerosp & Mech Engn, Epstein Dept Ind & Syst Engn, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Keck Sch Med, Roski Eye Inst, Los Angeles, CA 90033 USA|Univ Southern Calif, Viterbi Sch Engn, Dept Biomed Engn, Los Angeles, CA 90089 USA;

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  • 正文语种 eng
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  • 关键词

    biomedical; flexible device; piezoelectric composite; retinal stimulation; ultrasonic energy transfer;

    机译：生物医学;柔性装置;压电复合材料;视网膜刺激;超声波能量转移;

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