Noninvasive Control of the Power Transferred to an Implanted Device by an Ultrasonic Transcutaneous Energy Transfer Link
Noninvasive Control of the Power Transferred to an Implanted Device by an Ultrasonic Transcutaneous Energy Transfer Link
复制标题
通过超声波经皮能量传输链路传输至植入设备的功率的无创控制
DOI：
10.1109/tbme.2013.2280460
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发表时间：
2014
影响因子：
4.6
通讯作者：
B. Spivak
中科院分区：
文献类型：
--
作者：
D. Shmilovitz;S. Ozeri;Chua;B. Spivak
超声经皮能量转移是一种有效的无创供电植入装置的方法。然而，由植入的接收器收集的功率量对相对于植入的接收换能器附着在皮肤上的外部发射换能器的距离和方向敏感。本文介绍了一种超声功率传输环节，其功率采集由感应环节控制。一个小的（5 μF）存储电容电压，这是植入单元的一部分，允许在3.8和3.5 V之间摆动使用滞后控制。这两种控制状态通过激励（当植入的存储电容器电压降低时）或植入线圈的不激励来表示，该线圈与附着在皮肤表面的外部线圈进行磁耦合。采用两个相同尺寸的压电换能器（Fuji Ceramics C-2 PZT圆盘，15 mm × 3 mm），在720 kHz的振动频率下工作，制作了35 mW的超声经皮能量传递链。通过应用所提出的滞后控制，捕获功率可以有效地调节到植入深度达85 mm。
Ultrasonic transcutaneous energy transfer is an effective method for powering implanted devices noninvasively. Nevertheless, the amount of power harvested by the implanted receiver is sensitive to the distance and orientation of the external transmitting transducer attached to the skin with respect to the implanted receiving transducer. This paper describes an ultrasonic power transfer link whose harvested power is controlled by an inductive link. A small (5 μF) storage capacitor voltage, which is part of the implanted unit, is allowed to swing between 3.8 and 3.5 V using hysteretic control. The two control states are indicated by excitation (while the implanted storage capacitor voltage decreases) or the absence of excitation of an implanted coil that is magnetically coupled to an external coil attached to the skin surface. A 35 mW Ultrasonic Transcutaneous Energy Transfer link was fabricated using two piezoelectric transducers of equal size (Fuji Ceramics C-2 PZT disc 15 mm × 3 mm) operated at a vibration frequency of 720 kHz. By applying the proposed hysteretic control, the captured power was effectively regulated for implantation depths of up to 85 mm.