Body-coupled power transmission and energy harvesting

Li, Jiamin; Dong, Youming; Park, Jeong Hoan; Yoo, Jerald

doi:10.1038/s41928-021-00592-y

Cited by 79 publications

(46 citation statements)

References 49 publications

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“…As its name implies, this circuit is composed of a capacitor formed by the air/environment as dielectric between RX and TX terminals ( Fig. 2A , top highlighted in yellow) ( 18 , 35 ). Therefore, the simplified circuit diagram of CC is composed of two paths between TX (source) and RX (measure): (i) a lateral cutaneous path consisting of the tissue impedance ( Z T ) in series with the electrode/tissue interface impedance, defined by the tissue’s electrochemical properties, electrode materials, and effective electrode area, and (ii) an environmental path consisting of the environmental capacitance ( C env ), defined by the size of the RX and TX electrodes and the dielectric properties of the environment and air ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Ionic communication for implantable bioelectronics

et al. 2022

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Implanted bioelectronic devices require data transmission through tissue, but ionic conductivity and inhomogeneity of this medium complicate conventional communication approaches. Here, we introduce ionic communication (IC) that uses ions to effectively propagate megahertz-range signals. We demonstrate that IC operates by generating and sensing electrical potential energy within polarizable media. IC was tuned to transmit across a range of biologically relevant tissue depths. The radius of propagation was controlled to enable multiline parallel communication, and it did not interfere with concurrent use of other bioelectronics. We created a fully implantable IC-based neural interface device that acquired and noninvasively transmitted neurophysiologic data from freely moving rodents over a period of weeks with stability sufficient for isolation of action potentials from individual neurons. IC is a biologically based data communication that establishes long-term, high-fidelity interactions across intact tissue.

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Section: Resultsmentioning

confidence: 99%

Ionic communication for implantable bioelectronics

et al. 2022

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“…The printability of the substrates is a key issue in designing flexible antennas; different conductive materials can be printed, commonly copper, but also other ink formulations 197 . Beyond these materials, new physical effects and materials are being investigated 198 , 199 to advance the field of wireless power transfer.…”

Section: Assembling Wearable Devicesmentioning

confidence: 99%

End-to-end design of wearable sensors

et al. 2022

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Wearable devices provide an alternative pathway to clinical diagnostics by exploiting various physical, chemical and biological sensors to mine physiological (biophysical and/or biochemical) information in real time (preferably, continuously) and in a non-invasive or minimally invasive manner. These sensors can be worn in the form of glasses, jewellery, face masks, wristwatches, fitness bands, tattoo-like devices, bandages or other patches, and textiles. Wearables such as smartwatches have already proved their capability for the early detection and monitoring of the progression and treatment of various diseases, such as COVID-19 and Parkinson disease, through biophysical signals. Next-generation wearable sensors that enable the multimodal and/or multiplexed measurement of physical parameters and biochemical markers in real time and continuously could be a transformative technology for diagnostics, allowing for high-resolution and time-resolved historical recording of the health status of an individual. In this Review, we examine the building blocks of such wearable sensors, including the substrate materials, sensing mechanisms, power modules and decision-making units, by reflecting on the recent developments in the materials, engineering and data science of these components. Finally, we synthesize current trends in the field to provide predictions for the future trajectory of wearable sensors.

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“…To alleviate the problem of transmission signal reduction while maintaining the quality of service, F I G U R E 2 Main components required to implement an all-day monitoring system communication methods (adaptive channel coding, 27,28 transmission power scaling, 29 multiple-input multiple-output [MIMO], 30,31 novel transceiver architecture, 32 and QoSaware media access protocols 33 ) are reported. Technological advancements likewise smart textiles, 34,35 magnetic induction, [36][37][38][39] and body-coupled communications [40][41][42] also show potential. Smart textiles can reduce telecommunication power overhead and simplify networking schemes to improve market utilization by lowering costs, ensuring ease of cleaning, and encouraging standardization in manufacturing.…”

Section: Communicationmentioning

confidence: 99%

All‐day wearable health monitoring system

Han

Naqi

Kim

et al. 2022

EcoMat

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Wearable devices are widely used in the smart healthcare monitoring system to detect changes in user parameters through applications such as wristwatches, bands, and clothing electronic skin. In addition, multimode devices enable monitoring of vital signs, helping diagnose and prevent diseases. A wearable device detects the user's biological signals such as body temperature, movement, heartbeat, and humidity level, transmits the information to the mobile phone, and sends the information to an emergency center/family/clinician through cloud computing or wireless communication systems. This all‐day monitoring system enables the user's status information to be monitored 24 h a day to ensure appropriate treatment, thereby facilitating highly personalized care due to its human‐centricity. When integrated with higher‐level infrastructure, it is expected to be useful in healthcare scenarios, providing benefits to multiple stakeholders. In addition, it will help protect people exposed to potentially life‐threatening environments such as military personnel, first responders, and deep‐sea and space explorers. In this review, the components for implementing an all‐day monitoring system are described, including the electrode design strategy for realizing a skin attachable e‐skin device. Issues related to flexible storage devices and recent research results are also discussed.

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Body-coupled power transmission and energy harvesting

Cited by 79 publications

References 49 publications

Ionic communication for implantable bioelectronics

Ionic communication for implantable bioelectronics

End-to-end design of wearable sensors

All‐day wearable health monitoring system

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