A Multi-Functional Physiological Hybrid-Sensing E-Skin Integrated Interface for Wearable IoT Applications

Lee, Kwangmuk; Chae, Hee Young; Park, Kyeonghwan; Lee, Youngoh; Cho, Seungse; Ko, Hyunhyub; Kim, Jae Joon

doi:10.1109/tbcas.2019.2946875

Cited by 22 publications

(11 citation statements)

References 25 publications

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“…That is much better than the popular photoelectric pulse wave sensors that output low-precision signals. On the other hand, the relative height of these peaks is helpful for analyzing cardiovascular diseases of the human body; thus, the FPS might be applied to home medical monitoring systems for auxiliary diagnosis. , To demonstrate the pressure mapping ability of the capacitive FPS, a 4 × 6 sensor microarray (unit size: 1.5 × 1 mm) was fabricated in combination with the flexible printed circuit (FPC) process as shown in Figure S9. The 24 channels of capacitance signal were transformed by two analog to digital converters (AD7147, Analog Devices) and processed by a microcontroller (STM32 F407, STM microelectronics).…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive Capacitive Flexible Pressure Sensor Based on a High-Permittivity MXene Nanocomposite and 3D Network Electrode for Wearable Electronics

Zhang

Wang

et al. 2021

ACS Sens.

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With the fast development of consumer electronic and artificial intelligence equipment, flexible pressure sensors (FPSs) have become a momentous component in the application of wearable electronic, electronic skin, and human–machine interfacing. The capacitive FPS possesses the merits of low energy consumption, high resolution, and fast dynamic response, so it is ideal for mobile and wearable electronics. However, capacitive FPS is vulnerable to electromagnetic interference and parasitic capacitance due to its low sensitivity. Microstructure or porous dielectric materials have been applied to improve the sensitivity of the capacitive FPS, but the high sensitivity is just limited to a narrow region. In this work, we propose a different strategy that incorporates a high-permittivity MXene nanocomposite dielectric with a 3D network electrode (3DNE) to improve the sensing performance of the capacitive FPS. Thanks to the high permittivity of the dielectric layer and hierarchical deformation of the electrode, the fabricated capacitive FPS exhibits a high sensitivity of 10.2 kPa–1 in the low pressure range (0–8.6 kPa) and still maintains a relatively high sensitivity of 3.65 kPa–1 with a near-linear response in a wide pressure range (8.6–100 kPa). In addition, the capacitive FPS can withstand over 20,000 times pressure loads without significant signal damping. Furthermore, the working mechanism of the capacitive FPS is illustrated by the finite element analysis (FEA) method and theoretical calculation. The application potential of the sensor in wearable electronics was demonstrated by human pulse wave monitoring and pressure mapping tests with a 4 × 6 sensor microarray.

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Section: Resultsmentioning

confidence: 99%

Highly Sensitive Capacitive Flexible Pressure Sensor Based on a High-Permittivity MXene Nanocomposite and 3D Network Electrode for Wearable Electronics

Zhang

Wang

et al. 2021

ACS Sens.

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“…Fig. 4(a) shows an architecture of the customized ROIC, and it mainly includes biopotential [20] and bio-impedance analog front-ends, and a successive approximation register analog-todigital converter (SAR-ADC) [21]. The biopotential and bioimpedance AFEs acquire the ECG and bio-impedance signals at each, and SAR-ADC simultaneously converts the biosignals to digital data.…”

Section: B Architecture Of Customized Roicmentioning

confidence: 99%

“…The IPG signal is a very small AC impedance (< 1Ω), but a very large DC impedance (> hundreds Ω) due to the body component is also measured when the IPG signal acquisition [23]. Therefore, DC-artifact cancellation scheme is necessary to sufficiently amplify the desired biopotential and bio-impedance signals, and an analog DC-servo loop (DSL) [14], [20] is a widely used circuit structure to remove the DC artifacts by implementing a HPF characteristic. However, there is a trade-off between implementations of the low HPF cutoff frequency and the wide IDO cancellation range, and if the HPF cutoff frequency is not low enough, inaccurate PTT is obtained by a phase shift which degrades an accuracy of the PTT-based BP estimation.…”

Section: B Architecture Of Customized Roicmentioning

confidence: 99%

Neckband-Based Continuous Blood Pressure Monitoring Device With Offset-Tolerant ROIC

et al. 2022

Self Cite

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This study presents a wearable neckband device for continuous cuffless blood pressure (BP) monitoring, where reliable neck-based BP measurement is achieved by utilizing the electrocardiogram (ECG) and impedance plethysmogram (IPG). Optimal composition and position of sensing electrodes around the neck were decided with consideration for physiological characteristics of the human body, and the core parameter of IPG magnitude was experimentally selected to improve the BP estimation accuracy. For its small-featured noises-tolerant detection capability, a customized readout integrated circuit (ROIC) was developed, which includes two kinds of analog front-ends (AFEs) for biopotential and bio-impedance. Both AFEs are proposed to include an attenuator-assisted hybrid DC-servo loop (DSL) structure, achieving precise pulse transit time (PTT) calculation by lowering the high-pass filtering cutoff frequency and also stable signal acquisition by widening the offset-cancellation range. Real-time PTT monitoring and BP estimation are wirelessly conducted, and its continuous operation time with 350-mAh battery capacity is longer than 5 hours. Efficacy of the proposed neckband BP device was evaluated for 8 healthy subjects under the physical stress condition, where the mean correlation coefficient and the standard deviation were achieved as 0.8508 and 4.17mmHg respectively.INDEX TERMS Neckband device, pulse transit time, continuous blood pressure monitoring, impedance plethysmogram, readout integrated circuit.

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“…In most cases, accessorytype wearable devices fail to provide an accurate electrode-based physiological detection capability due to unreliable body contact. Therefore, many recent research interests have moved to attachable body devices, including patch and sticker type devices [6][7][8][9][10]. Flexible sensing electrodes are required to implement these attachable devices, and modules should be miniaturized to provide comfortable body wearing.…”

Section: Introductionmentioning

confidence: 99%

High Density Resistive Array Readout System for Wearable Electronics

Lakshminarayana

Park

et al. 2022

Sensors

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This work presents a wearable sensing system for high-density resistive array readout. The system comprising readout electronics for a high-density resistive sensor array and a rechargeable battery, was realized in a wristband. The analyzed data with the proposed system can be visualized using a custom graphical user interface (GUI) developed in a personal computer (PC) through a universal serial bus (USB) and using an Android app in smartphones via Bluetooth Low Energy (BLE), respectively. The readout electronics were implemented on a printed circuit board (PCB) and had a compact dimension of 3 cm × 3 cm. It was designed to measure the resistive sensor with a dynamic range of 1 KΩ–1 MΩ and detect a 0.1% change of the base resistance. The system operated at a 5 V supply voltage, and the overall system power consumption was 95 mW. The readout circuit employed a resistance-to-voltage (R-V) conversion topology using a 16-bit analog-to-digital converter (ADC), integrated in the Cypress Programmable System-on-Chip (PSoC®) 5LP microcontroller. The device behaves as a universal-type sensing system that can be interfaced with a wide variety of resistive sensors, including chemiresistors, piezoresistors, and thermoelectric sensors, whose resistance variations fall in the target measurement range of 1 KΩ–1 MΩ. The system performance was tested with a 60-resistor array and showed a satisfactory accuracy, with a worst-case error rate up to 2.5%. The developed sensing system shows promising results for applications in the field of the Internet of things (IoT), point-of-care testing (PoCT), and low-cost wearable devices.

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A Multi-Functional Physiological Hybrid-Sensing E-Skin Integrated Interface for Wearable IoT Applications

Cited by 22 publications

References 25 publications

Highly Sensitive Capacitive Flexible Pressure Sensor Based on a High-Permittivity MXene Nanocomposite and 3D Network Electrode for Wearable Electronics

Highly Sensitive Capacitive Flexible Pressure Sensor Based on a High-Permittivity MXene Nanocomposite and 3D Network Electrode for Wearable Electronics

Neckband-Based Continuous Blood Pressure Monitoring Device With Offset-Tolerant ROIC

High Density Resistive Array Readout System for Wearable Electronics

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