TY - GEN
T1 - A Comparative Study on Wireless Power Transfer to Millimeter-Scale Biomedical Implants with Ultrasound and Magnetoelectric Technologies
AU - Hosur, Sujay
AU - Karan, Sumanta Kumar
AU - Priya, Shashank
AU - Kiani, Mehdi
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Wireless power transfer (WPT) to biomedical implants enables their miniaturization to millimeter (mm) scales by removing their battery, which is critical for chronic operation. Ultrasound (US) and magnetoelectric (ME) modalities are both emerging technologies for WPT to mm-sized implants at deep sites (several centimeters) as they enjoy higher regulatory safety limits. In US WPT, the piezoelectric transducer in the implant generates an electric voltage when actuated by US pressure. In ME WPT, the ME transducer composed of a layered magnetostrictive and piezoelectric structure is exposed to low-frequency magnetic field to generate an electric voltage. Since both US and ME transducers operate at acoustic wave resonance, high-performance mm-sized transducers operating at MHz and sub-MHz frequencies are viable. Although US and ME WPT modalities have been studied individually in the literature, there is no comparative study of them for similar conditions. This paper compares the power delivery capabilities of these two modalities using comparable mm-sized receiver transducers of 6.4×2.3×1 mm3. In measurements at 30 mm depth, considering the safety limits, the ME and US WPT links could deliver 4.4 mW and 6.25 mW of power in a tissue and water medium, respectively.
AB - Wireless power transfer (WPT) to biomedical implants enables their miniaturization to millimeter (mm) scales by removing their battery, which is critical for chronic operation. Ultrasound (US) and magnetoelectric (ME) modalities are both emerging technologies for WPT to mm-sized implants at deep sites (several centimeters) as they enjoy higher regulatory safety limits. In US WPT, the piezoelectric transducer in the implant generates an electric voltage when actuated by US pressure. In ME WPT, the ME transducer composed of a layered magnetostrictive and piezoelectric structure is exposed to low-frequency magnetic field to generate an electric voltage. Since both US and ME transducers operate at acoustic wave resonance, high-performance mm-sized transducers operating at MHz and sub-MHz frequencies are viable. Although US and ME WPT modalities have been studied individually in the literature, there is no comparative study of them for similar conditions. This paper compares the power delivery capabilities of these two modalities using comparable mm-sized receiver transducers of 6.4×2.3×1 mm3. In measurements at 30 mm depth, considering the safety limits, the ME and US WPT links could deliver 4.4 mW and 6.25 mW of power in a tissue and water medium, respectively.
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U2 - 10.1109/BioCAS58349.2023.10388751
DO - 10.1109/BioCAS58349.2023.10388751
M3 - Conference contribution
AN - SCOPUS:85184980560
T3 - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
BT - BioCAS 2023 - 2023 IEEE Biomedical Circuits and Systems Conference, Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Biomedical Circuits and Systems Conference, BioCAS 2023
Y2 - 19 October 2023 through 21 October 2023
ER -