Conductive textile element embedded in a wearable device for joint motion monitoring

Carnevale, A; Massaroni, Carlo; Presti, Daniela Lo; Tocco, Joshua Di; Zaltieri, Martina; Formica, Domenico; Longo, Umile Giuseppe; Schena, Emiliano; Denaro, Vincenzo

doi:10.1109/memea49120.2020.9137251

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…The reason for these results is probably related to the anthropometric heterogeneity of the subjects involved in the experimental trials. This aspect is not of particular relevance in the design of wearable systems based on resistive textile sensors since they work better in extension than in shortening [ 34 ]. Therefore, the regions subjected to higher stretch values should be considered for the placement of textile-based strain sensors.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, an open challenge in the development of wearable systems based on strain sensors is the proper placement of the sensing elements. To date, several textile-based strain sensors have been designed and employed to measure human joints movements [7,8,22,[34][35][36][37]. Among textile-based strain sensors, resistive ones are popular for instrumenting wearables [6,19].…”

Section: Discussionmentioning

confidence: 99%

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Skin Strain Analysis of the Scapular Region and Wearables Design

Carnevale

Schena

Formica

et al. 2021

Sensors

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Monitoring scapular movements is of relevance in the contexts of rehabilitation and clinical research. Among many technologies, wearable systems instrumented by strain sensors are emerging in these applications. An open challenge for the design of these systems is the optimal positioning of the sensing elements, since their response is related to the strain of the underlying substrates. This study aimed to provide a method to analyze the human skin strain of the scapular region. Experiments were conducted on five healthy volunteers to assess the skin strain during upper limb movements in the frontal, sagittal, and scapular planes at different degrees of elevation. A 6 × 5 grid of passive markers was placed posteriorly to cover the entire anatomic region of interest. Results showed that the maximum strain values, in percentage, were 28.26%, and 52.95%, 60.12% and 60.87%, 40.89%, and 48.20%, for elevation up to 90° and maximum elevation in the frontal, sagittal, and scapular planes, respectively. In all cases, the maximum extension is referred to the pair of markers placed horizontally near the axillary fold. Accordingly, this study suggests interesting insights for designing and positioning textile-based strain sensors in wearable systems for scapular movements monitoring.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Skin Strain Analysis of the Scapular Region and Wearables Design

Carnevale

Schena

Formica

et al. 2021

Sensors

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“…Flexible and wearable devices able to sense bending are more and more developed for applications such as smart clothing, rehabilitation, prosthetic limbs, sport and research [1][2][3][4][5][6][7][8][9]. During the last years, flexible devices to sense both mechanical strain and physiological parameters are attracting interest to design novel, robust and low-cost systems for personalized medicine [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, multisensing platforms are composed of a flexible substrate (e.g., polydimethylsiloxane-PDMS, textiles, Kapton ® ) and a sensitive element that can be made of nanomaterials, intrinsically conductive polymers (ICPs), conductive inks or optical fibers. [4][5][6][7][8][9] Two-sensing units on one single platform often requires long and complicated fabrication process-flows, unless if the same sensitive material is used for the two units [2,3]. In this work, we proposed a multisensing platform based on the common sensitive element able to monitor the two signals, which implies one single and simple process flow for the whole platform.…”

Section: Introductionmentioning

confidence: 99%

Electrospun PEO/PEDOT:PSS Nanofibers for Wearable Physiological Flex Sensors

Verpoorten

Massaglia

Pirri

et al. 2021

Sensors

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Flexible sensors are fundamental devices for human body monitoring. The mechanical strain and physiological parameters coupled sensing have attracted increasing interest in this field. However, integration of different sensors in one platform usually involves complex fabrication process-flows. Simplification, even if essential, remains a challenge. Here, we investigate a piezoresistive and electrochemical active electrospun nanofibers (NFs) mat as the sensitive element of the wearable physiological flex sensing platform. The use of one material sensitive to the two kinds of stimuli reduces the process-flow to two steps. We demonstrate that the final NFs pH-Flex Sensor can be used to monitor the deformation of a human body joint as well as the pH of the skin. A unique approach has been selected for pH sensing, based on Electrochemical Impedance Spectroscopy (EIS). A linear dependence of the both the double layer capacitance and charge transfer re-sistance with the pH value was obtained by EIS, as well as a linear trend of the electrical resistance with the bending deformation. Gauge factors values calculated after the bending test were 45.84 in traction and 208.55 in compression mode, reflecting the extraordinary piezoresistive behavior of our nanostructured NFs.

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“…[1-3] Usually, flex sensors are composed of a flexible substrate (PDMS, textile, Kapton) and a sensitive element that can be made of nanomaterials, intrinsically conductive polymers, conductive inks or optical fiber. [4][5][6][7][8] Moreover, devices able to give information not only on the mechanical strain but also on the physiological parameters are attracting interest to extend the application field to health monitoring devices, designing novel, robust and low-cost wearable sensing units [9][10][11][12]. The combination of sweat-pH and joint bending information obtained by stretchable and pH-sensitive piezoresistive flex sensors are part of these multisensing devices.…”

Section: Introductionmentioning

confidence: 99%

Electrospun PEO/PEDOT:PSS nanofibers for wearable physiological flex sensors

Verpoorten

Massaglia

Quaglio

2020

Proceedings of 7th International Electronic Conference on Sensors and Applications

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Flexible sensors are fundamental devices for human body monitoring in application areas ranging from health care to soft robotics. During the last decade the possibility to couple sensing of mechanical strain and physiological parameters have attracted ever increasing interest to design novel, robust and low-cost wearable sensing units. Stretchable and pH sensible piezoresistive strain sensors made by blending intrinsically conductive polymers and polymeric electrolyte can serve this purpose. In this work, we specifically investigate a Crosslinked Nanofibers (NFs) Flex Sensor able to detect mechanical flexion and pH change. The optimized sensitive element of the NFs Flex Sensor is based on crosslinked electrospun NFs mats made of a blend of (polyethylene oxide) PEO as the polymeric electrolyte, and poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) as the intrinsically conductive polymer. The NFs Flex Sensor has been obtained by directly collecting the nanomaterial on a flexible and biocompatible polydimethylsiloxane (PDMS) slab and thermally treating it to promote electrical conductivity of the PEO/PEDOT:PSS NFs. The thermal treatment was optimized to crosslink PEO and PSS while preserving the nanostructuration, to optimize the mechanical coupling with PDMS substrate and to improve water resistance. In this work, we demonstrate excellent mechanical sensing of the NFs Flex Sensor coupled to electrochemical pH detection. Change of pH was detected by Electrochemical Impedance Spectroscopy (EIS), obtaining a linear dependence of the capacitance with the pH value. The piezo-resistive characterization of the Crosslinked NFs Flex Sensors demonstrated the ability of nanomaterials to recover their initial configuration after release of the mechanical strain in both compression and traction mode. The Gauge Factors (GFs) values were 45.84 in traction and 208.55 in compression mode, reflecting the extraordinary piezoresistive behavior of our nanostructurated PEO/PEDOT:PSS NFs.

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Conductive textile element embedded in a wearable device for joint motion monitoring

Cited by 10 publications

References 19 publications

Skin Strain Analysis of the Scapular Region and Wearables Design

Skin Strain Analysis of the Scapular Region and Wearables Design

Electrospun PEO/PEDOT:PSS Nanofibers for Wearable Physiological Flex Sensors

Electrospun PEO/PEDOT:PSS nanofibers for wearable physiological flex sensors

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