A wood-templated unidirectional piezoceramic composite for transmuscular ultrasonic wireless power transfer

Hong, Ying; Jin, Lihan; Wang, Biao; Liao, Junchen; He, Bing; Yang, Tian; Long, Zhihe; Li, Pengyu; Zhang, Zhuomin; Liu, Shiyuan; Lee, Youngjin; Khoo, Bee Luan; Yang, Zhengbao

doi:10.1039/d1ee02353e

Cited by 44 publications

(31 citation statements)

References 62 publications

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“…Nevertheless, device performance and functionality could be further improved toward translational applications. First, the acoustic-electrical coupling efficiency of the piezo-layers could be enhanced via material composition and structural design 57 , 58 . Higher electrical outputs could be achieved under lower acoustic intensities, thereby ensuring stimulation studied well below the safety limit and minimizing the ultrasonic biological effects (e.g., thermal and mechanical effects) 59 .…”

Section: Discussionmentioning

confidence: 99%

Flexible ultrasound-induced retinal stimulating piezo-arrays for biomimetic visual prostheses

Jiang

Lu²,

Zeng³

et al. 2022

Nat Commun

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Electronic visual prostheses, or biomimetic eyes, have shown the feasibility of restoring functional vision in the blind through electrical pulses to initiate neural responses artificially. However, existing visual prostheses predominantly use wired connections or electromagnetic waves for powering and data telemetry, which raises safety concerns or couples inefficiently to miniaturized implant units. Here, we present a flexible ultrasound-induced retinal stimulating piezo-array that can offer an alternative wireless artificial retinal prosthesis approach for evoking visual percepts in blind individuals. The device integrates a two-dimensional piezo-array with 32-pixel stimulating electrodes in a flexible printed circuit board. Each piezo-element can be ultrasonically and individually activated, thus, spatially reconfigurable electronic patterns can be dynamically applied via programmable ultrasound beamlines. As a proof of concept, we demonstrate the ultrasound-induced pattern reconstruction in ex vivo murine retinal tissue, showing the potential of this approach to restore functional, life-enhancing vision in people living with blindness.

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Section: Discussionmentioning

confidence: 99%

Flexible ultrasound-induced retinal stimulating piezo-arrays for biomimetic visual prostheses

Jiang

Lu²,

Zeng³

et al. 2022

Nat Commun

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“…In other power sources, such as solar cells, pyroelectrics, piezoelectric generators, and energy storage devices, voltage always plays an indispensable role when it comes to energy output and charge transfer. [22][23][24] However, it is unclear whether the voltage of a TENG has important effects on the energy output and charge transfer. Gaining a fundamental understanding of energy output and charge transfer is of great importance for the development of TENGs into a major form of energy technology.…”

Section: Introductionmentioning

confidence: 99%

A highly efficient constant-voltage triboelectric nanogenerator

Zhang

Gao

et al. 2022

Energy Environ. Sci.

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“…Polymer and environmentally-benign lead-free ceramic based piezocomposites overcome many of these limitations by combining piezoelectricity, flexibility, and nontoxicity (lead-free), with promising applications in implantable ultrasonic energy harvesters. [17,[33][34][35][36][37] Unfortunately, such approaches simultaneously sacrificed the piezoelectricity of ceramics and the flexibility of polymers, consequently, neither achieved high piezoelectricity nor realized acoustic impedance matching between polymers, ceramics, and bio-tissues to satisfy the need of highly efficient ultrasonic energy harvester.…”

Section: Introductionmentioning

confidence: 99%

Hybrid‐Piezoelectret Based Highly Efficient Ultrasonic Energy Harvester for Implantable Electronics

Xiao

Chen

et al. 2022

Adv Funct Materials

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Implantable ultrasonic energy harvesters that scavenge wireless mechanic energy from ultrasound own remarkable potential in advanced medical protocols for neuroprosthetics, wireless power, biosensor, etc. The main challenge for this kind of device is to achieve high‐efficiency energy conversion in a weak ultrasonic pressure field. Here, a multilayered piezoelectret with strain enhanced piezoelectricity by introducing a parallel‐connected air hole array in an interdielectric layer sandwiched between a pair of electrets for an efficient ultrasonic energy harvester is presented. This device delivers a remarkable peak output power around 13.13 mW and short‐circuits current around 2.2 mA when implanted into tissues at 5~10 mm under an ultrasonic probe setup at 25 mW cm−2, which is higher than the required power threshold of bioelectronic devices and current threshold of nerve stimulation. Furthermore, the feasibility of supplying power to implantable bioelectronics and working as neuroproteins for peripheral nerve stimulation are both demonstrated. It is anticipated that this highly efficient, easily fabricated, and biocompatible device will potentially enable applications for multifunctional and advanced implantable bioelectronics in the next generation of diagnosis and therapy.

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A wood-templated unidirectional piezoceramic composite for transmuscular ultrasonic wireless power transfer

Abstract: A flexible wood-templated piezoelectric ultrasonic energy harvester exhibits a high output voltage and power, demonstrating potential applications in implantable devices.

Cited by 44 publications

References 62 publications

Flexible ultrasound-induced retinal stimulating piezo-arrays for biomimetic visual prostheses

Flexible ultrasound-induced retinal stimulating piezo-arrays for biomimetic visual prostheses

A highly efficient constant-voltage triboelectric nanogenerator

Hybrid‐Piezoelectret Based Highly Efficient Ultrasonic Energy Harvester for Implantable Electronics

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