Simultaneous Ultrasonic Power Transfer and Depth Feedback for Active Medical Implants
2023 IEEE International Conference on Mechatronics (ICM)(2023)
摘要
Wireless power transfer allows the delivery of energy to locations where electric wires cannot reach; one of the applications of it is powering active medical implants. Ultrasonic power transfer (USPT) has the potential to deliver a promising power density due to higher regulation limit. This method also possesses the possibility of maintaining a relatively small device size due to the short wavelength of mechanical waves in the ultrasonic frequency band. Previous studies have successfully proved the idea of powering a low-power computing device through ultrasonic power link. This paper reports a USPT system with the ability of data transfer and position feedback. The USPT system consists of a wearable transmitter and an implanted receiver in this system both featured a $2 \times 2 \times 2 \mathrm{~mm}^{3}$ cubic piezoelectric transducer: The resonant frequency of the system was determined to be 750 kHz. When the transmitter was driven with $\pm 30 \mathrm{~V}$, the receiver produced a peak-to-peak output voltage of 120 mV when placed $1 \mathrm{~cm}$ away from the transmitter. To test the capability of data transfer and position feedback of this system, the transmitter was driven with a non-return-tozero (NRZ) pulse. The pulse could be detected with a driving voltage as low as $\pm 5 \mathrm{~V}$.
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关键词
wireless power transfer,ultrasound,piezoelectricity,medical implants,position feedback
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