A mm-Sized Implantable Medical Device (IMD) With Ultrasonic Power Transfer and a Hybrid Bi-Directional Data Link
A mm-Sized Implantable Medical Device (IMD) With Ultrasonic Power Transfer and a Hybrid Bi-Directional Data Link
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DOI：
10.1109/jssc.2015.2427336
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发表时间：
2015-08-01
影响因子：
5.4
通讯作者：
Arbabian, Amin
中科院分区：
文献类型：
--
作者：
Charthad, Jayant;Weber, Marcus J.;Arbabian, Amin
提出了使用超声功率传输和混合双向数据通信链路的第一概念验证mm尺寸的可植入设备。超声波能量传输使植入物小型化和在体内深处操作成为可能，同时仍能达到大多数植入物应用所需的安全和高功率水平（100 μ W至几mW）。目前的植入物原型尺寸为4 mm x 7.8 mm，由一个压电接收器、一个采用65 nm CMOS工艺设计的IC和一个片外天线组成。该IC可支持100 W的最大直流负载，入射声强度与FDA诊断限值的5%相似。这证明了提供更高可用DC功率的可行性，可能开辟新的植入物应用。所提出的混合双向数据链路由超声下行链路和RF上行链路组成。超声输入的下降沿被检测为下行链路数据。该植入物传输超宽带（UWB）脉冲序列作为上行链路数据，展示了在未来实现节能M元PPM发射机的能力。
A first proof-of-concept mm-sized implantable device using ultrasonic power transfer and a hybrid bi-directional data communication link is presented. Ultrasonic power transfer enables miniaturization of the implant and operation deep inside the body, while still achieving safe and high power levels (100 mu W to a few mWs) required for most implant applications. The current implant prototype measures 4 mm x 7.8 mm and is comprised of a piezoelectric receiver, an IC designed in 65 nm CMOS process and an off-chip antenna. The IC can support a maximum DC load of 100 W for an incident acoustic intensity that is similar to 5% of the FDA diagnostic limit. This demonstrates the feasibility of providing further higher available DC power, potentially opening up new implant applications. The proposed hybrid bi-directional data link consists of ultrasonic downlink and RF uplink. Falling edge of the ultrasound input is detected as downlink data. The implant transmits an ultra-wideband (UWB) pulse sequence as uplink data, demonstrating capability of implementing an energy-efficient M-ary PPM transmitter in the future.