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A Method and Analysis to Enable Efficient Piezoelectric Transducer-Based Ultrasonic Power and Data Links for Miniaturized Implantable Medical Devices.
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control ( IF 3.6 ) Pub Date : 2021-10-22 , DOI: 10.1109/tuffc.2021.3093867
Soner Sonmezoglu , Ali Darvishian , Konlin Shen , Mauricio J Bustamante , Averal Kandala , Michel M Maharbiz

Acoustic links for implantable medical devices (implants) have gained attention primarily because they provide a route to wireless deep-tissue systems. The miniaturization of the implants is a key research goal in these efforts, nominally because smaller implants result in less acute tissue damage. Implant size in most acoustic systems is limited by the piezoelectric bulk crystal used for power harvesting and data communication. Further miniaturization of the piezocrystal can degrade system power transfer efficiency and data transfer reliability. Here, we present a new method for packaging the implant piezocrystal; the method maximizes power transfer efficiency ( η ) from the acoustic power at the piezo surface to the power delivered to the electrical load and information transfer across the acoustic link. Our method relies on placing piezo-to-substrate anchors to the piezo regions where the vibrational displacement of the mode of interest is zero. To evaluate our method, we investigated packaged 1×1×1 mm3 piezocrystals assembled with different sized anchors. Our results show that reducing the anchor size decreases anchor loss and thus improves piezo quality factor (Q). We also demonstrate that this method improves system electromechanical coupling. A strongly coupled, high-Q piezo with properly sized and located anchors is demonstrated to achieve significantly higher η and superior data transfer capability at resonance. Overall, this work provides an analysis and generic method for packaging the implant piezocrystal that enables the design of efficient acoustic power and data links, which provides a path toward the further miniaturization of ultrasonic implants to submillimeter scales.

中文翻译:

一种为微型植入式医疗设备提供基于压电换能器的高效超声电源和数据链路的方法和分析。

植入式医疗设备(植入物)的声学链路之所以受到关注,主要是因为它们提供了通往无线深层组织系统的途径。植入物的小型化是这些努力的一个关键研究目标,名义上是因为较小的植入物导致较少的急性组织损伤。大多数声学系统中的植入物尺寸受到用于能量收集和数据通信的压电体晶体的限制。压电晶体的进一步小型化会降低系统功率传输效率和数据传输可靠性。在这里,我们提出了一种封装植入压电晶体的新方法;该方法最大限度地提高了从压电表面的声功率到传递给电气负载的功率以及跨声学链路的信息传输的功率传输效率 (η)。我们的方法依赖于将压电到基板的锚点放置在感兴趣模式的振动位移为零的压电区域。为了评估我们的方法,我们研究了组装有不同尺寸锚的封装 1×1×1 mm3 压电晶体。我们的结果表明,减小锚点尺寸会降低锚点损失,从而提高压电品质因数 (Q)。我们还证明了这种方法可以改善系统机电耦合。具有适当尺寸和位置的锚的强耦合、高 Q 压电被证明可以在共振时实现显着更高的 η 和卓越的数据传输能力。总的来说,这项工作提供了一种用于封装植入压电晶体的分析和通用方法,可以设计高效的声功率和数据链接,
更新日期:2021-07-01
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