【摘 要】
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Background, Motivation and Objective Millimeter and sub-mm sized implantable medical devices with high available power are attractive for many novel therapeutic applications. Ultrasonic power delivery
【机 构】
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Electrical Engineering, Stanford University, Stanford, CA, USA
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Background, Motivation and Objective Millimeter and sub-mm sized implantable medical devices with high available power are attractive for many novel therapeutic applications. Ultrasonic power delivery can be used to shrink down the dimensions of an implant and eliminate the need for batteries and wires, while achieving high power levels (> 1 mW) for great depths in the body. Compared to RF wireless powering, ultrasonic energy transfer has several advantages: high acoustic-electrical power conversion efficiency (PCE), lower losses through tissue, superior energy focusing, and favorable impedance to interface with integrated circuits. To design for desired impedance and high PCE, we investigate ultrasonic receivers with different piezoelectric materials; and we propose an electrical matching technique in the operating region to optimize efficiency over various load power from different operation modes of an implant.
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