Multichannel Piezo‐Ultrasound Implant with Hybrid Waterborne Acoustic Metastructure for Selective Wireless Energy Transfer at Megahertz Frequencies. Issue 44 (4th September 2021)

• Record Type: Journal Article
• Authors: Jiang, Laiming; Lu, Gengxi; Yang, Yang; Xu, Yang; Qi, Fangjie; Li, Jiapu; Zhu, Benpeng; Chen, Yong
• Is Part Of: Advanced materials. Volume 33:Issue 44(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-04
• Subjects: acoustic metastructure -- frequency‐controlled implant -- piezoelectric composites -- selective energy transfer -- ultrasound device; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202104251
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Ultrasound energy transfer (UET) is developed and integrated into various bioelectronics with diagnostic, therapeutic, and monitoring capabilities. However, existing UET platforms generally enable one function at a time due to the single ultrasound channel architecture, limiting the full potential of bioelectronics that requires multicontrol modes. Here, a multichannel piezo‐ultrasound implant (MC‐PUI) is presented that integrates a hybrid waterborne acoustic metastructure (HWAM), multiple piezo‐harvesters, and a miniaturized circuit with electronic components for selective wireless control via ultrasound frequency switching. The HWAM that utilizes both a 3D‐printed air‐diffraction matrix and a half‐lambda Fabry–Perot resonator is optimized to provide the advantage of ultrasound selectivity at megahertz frequencies. Complying with U.S. Food and Drug Administration regulations, frequency‐controlled multifunctional operations, such as wireless charging (≈11.08 µW) at 3.3 MHz and high‐sensitivity wireless switch/control (threshold ≈0.55 MPa) of micro‐light‐emitting diode/motor at 1 MHz, are demonstrated ex vivo using porcine tissue and in vivo in a rat. The developed MC‐PUI enhances UET versatility and opens up a new pathway for wireless implant design. Abstract : A novel multichannel piezo‐ultrasound implant (MC‐PUI) is proposed, which integrates a hybrid waterborne acoustic metastructure, multiple piezo‐harvesters, and a miniaturized circuit with electronic components for selective wireless control via ultrasound frequency switching. The optimized device structure that utilizes a 3D‐printed air‐diffraction matrix and a half‐lambda Fabry–Perot resonator provides the advantage of ultrasound frequency selectivity for in vivo multifunctional operations.