Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation
Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation
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DOI：
10.1088/1361-6439/ab257f
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发表时间：
2019-08-01
影响因子：
2.3
通讯作者：
Roundy, Shad
中科院分区：
文献类型：
--
作者：
Basaeri, Hamid;Yu, Yuechuan;Roundy, Shad
植入式医疗设备（IMD）可以使用声学无线供电，而无需电池。在由发射器、介质和接收器组成的声功率传输系统中，接收器产生的功率是其位置（相对于发射器的深度、取向和对准）的函数。输送到植入物的功率应保持稳定和可靠，即使植入物位置可能存在不确定性。在本文中，我们比较了两种常见的设计压电超声换能器，可用于声学供电的IMD，并研究其产生的功率的灵敏度，在其位置的任何变化。尽管商用现成（COTS）换能器在文献中广泛使用，但它们可能不是小型植入物供电的最佳候选者，因为它们可能无法在存在位置不确定性的情况下提供足够的功率。压电微机械超声换能器（pMUT）是隔膜结构，并且也适用于为植入物无线供电。我们提出了一个pMUT接收器，并研究了pMUT产生的功率对其位置变化的敏感性。然后，我们进行发电能力之间的比较研究，我们的pMUT和COTS换能器与相同的横向尺寸的pMUT。我们观察到，从pMUT结构产生的功率对器件的错误取向和未对准不太敏感。与COTS相比，pMUT产生的功率的平均百分比改善分别为86%、917%和111%，用于深度、对齐和方向。
Implantable medical devices (IMDs) can be powered wirelessly using acoustics with no need for a battery. In an acoustic power transfer system, which consists of a transmitter, medium, and a receiver, the power that the receiver generates is a function of its position (depth, orientation, and alignment relative to the transmitter). The power delivered to the implant should remain stable and reliable even with possible uncertainties in the location of the implant. In this paper, we compare two common designs for piezoelectric ultrasonic transducers that can be used for acoustically powering IMDs, and study their generated power sensitivity to any change in their location. Although commercial off-the-shelf (COTS) transducers are widely being used in the literature, they may not be the best candidate for powering small implants since they may not be able to provide sufficient power in the presence of location uncertainties. Piezoelectric micromachined ultrasonic transducers (pMUTs) are diaphragm structures and are also suitable for wirelessly powering implants. We present a pMUT receiver and study the sensitivity of the generated power of the pMUT to changes in its position. We then perform a comparative study between power generation capability of our pMUT and a COTS transducer with the same lateral dimensions as the pMUT. We observed that the generated power from a pMUT structure is less sensitive to misorientation and misalignment of the device. The average percentage improvement in the generated power from pMUT compared to COTS are 86%, 917%, and 111% for depth, alignment, and orientation, respectively.