Abstract
Wireless interrogation (power and data transfer) of biomedical implants, miniaturized to millimeter (mm) dimensions, is critical for their chronic operation. Achieving simultaneous wireless power and data transfer at deep sites reliably within safety limits for closed-loop sensing/actuation functions of mm-sized implants is challenging. To enable this operation, a hybrid magnetic-ultrasonic interrogation approach (called MagSonic) is realized through a single magnetoelectric (ME) transducer at the implant that can generate and receive both magnetic field and ultrasound. The fabricated mm-sized bar-shaped ME transducer (5.2×2×1.6 mm3) operates at acoustic wave resonance, functioning at sub-MHz frequencies. For the first time, we demonstrate wireless power reception through one modality (magnetic field or ultrasound) and simultaneous uplink data transmission using the other. At 40 mm depth, the MagSonic link could achieve 100 kbps uplink data rate (bit error rate ≤10−5) using 190 pJ/bit transmitted energy and 8 mW delivered power in tissue. The robustness of the MagSonic interrogation link against power carrier interference and misalignments is also demonstrated.
Original language | English (US) |
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Article number | 10321651 |
Pages (from-to) | 383-395 |
Number of pages | 13 |
Journal | IEEE transactions on biomedical circuits and systems |
Volume | 18 |
Issue number | 2 |
DOIs | |
State | Published - Apr 1 2024 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023 IEEE.
Keywords
- Wireless interrogation
- biomedical implants
- magnetic-ultrasound (MagSonic)
- magnetoelectric
PubMed: MeSH publication types
- Journal Article
- Research Support, U.S. Gov't, Non-P.H.S.