Wearable kinesthetic system for capturing and classifying upper limb gesture in post-stroke rehabilitation

Tognetti, Alessandro; Lorussi, Federico; Bartalesi, R.; Quaglini, Silvana; Tesconi, M.; Zupone, G.; Rossi, Danilo De

doi:10.1186/1743-0003-2-8

Cited by 139 publications

(54 citation statements)

References 11 publications

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“…On the other hand, fi bers with very high deformations and elasticity, typically produced from elastomers, are electrically insulating. The combination of high stretchability and high conductivity is important in applications requiring strain sensing such as wearable bionics [16][17][18][19][20][21] and for stretchable circuits, [ 22 ] and electrochromic textiles. [ 23 ] For strain sensing applications, where the change in electrical resistance is measured as a function of applied strain, it is highly desirable for this and the elastomeric components is avoided in the approach presented in this work.…”

Section: Introductionmentioning

confidence: 99%

“…In practical situations, the applied strains can be as small as less than a few percent or as large as tens to hundreds of percent. Some applications where small strains are important are damage detection, structural characterisation, and fatigue studies in materials, [24][25][26] while applications such as body movement measurement, [ 16,20 ] medical monitoring, [ 18,19,27 ] and sports rehabilitation and injury prevention [ 21,28 ] require large strains sensing. This work reports for the fi rst time, the production of elastomeric composite fi bers with high electrical conductivity that are capable of monitoring wide range of applied strains (up to 260%) and can therefore be useful in applications such as strain gauge sensors in wearable bionics and stretchable electronics.…”

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confidence: 99%

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Strain‐Responsive Polyurethane/PEDOT:PSS Elastomeric Composite Fibers with High Electrical Conductivity

Seyedin

Razal

Innis

et al. 2014

Adv Funct Materials

259

235

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2957www.MaterialsViews.com wileyonlinelibrary.com response to be measurable in a wide range of applied strain. In practical situations, the applied strains can be as small as less than a few percent or as large as tens to hundreds of percent. Some applications where small strains are important are damage detection, structural characterisation, and fatigue studies in materials, [24][25][26] while applications such as body movement measurement, [ 16,20 ] medical monitoring, [ 18,19,27 ] and sports rehabilitation and injury prevention [ 21,28 ] require large strains sensing. This work reports for the fi rst time, the production of elastomeric composite fi bers with high electrical conductivity that are capable of monitoring wide range of applied strains (up to 260%) and can therefore be useful in applications such as strain gauge sensors in wearable bionics and stretchable electronics. The fi ber wet-spinning approach that we have developed effi ciently exploits the high stretchability of a medical grade elastomeric polyurethane (PU) and the high conductivity of PEDOT:PSS.This work contributes to the relatively unexplored production of conductive and elastomeric composite fi bers. The lack of progress in this fi eld can be attributed to the limited development of elastomeric composite formulations that contain welldispersed conducting fi llers, which are also processable by fi ber wet-spinning methods. In the limited cases where conductive fi llers such as polyaniline, [ 29 ] polythiophene [ 30 ] and carbon nanotubes [ 31 ] were utilized in the wet-spinning of conducting fi ber composites, the observed change in the electrical properties have only been marginal at large deformations. These reports also show that signifi cant amount of fi ller loading is necessary to achieve percolation of conducting networks, which was found to be detrimental to the overall mechanical properties of the composite. The most common alternative approach to produce fi bers with both elastic and conductive properties is by coating the elastomeric fi ber (some reports use yarn or textile) with a thin layer of the conducting material. This approach has been used for conductor/elastomer combinations such as polypyrrole on Tactel/Lycra [ 32 ] and nylon/Lycra [ 21 ] fabrics and PEDOT:PSS on Spandex fabric [ 23 ] to name a few, employing methods such as oxidative chemical polymerization, in situ chemical polymerization, chemical vapor deposition, and dip-coating. However, the conductive coatings produced often have poor adhesion and are less stretchy than the parent elastomer fi ber resulting in poor overall electrical and mechanical performance. [ 21,23,32 ] The surface and mechanical property mismatch between the conductive Strain-Responsive Polyurethane/PEDOT:PSS Elastomeric Composite Fibers with High Electrical ConductivityMohammad Ziabari Seyedin , Joselito M. Razal , * Peter C. Innis , and Gordon G. Wallace * It is a challenge to retain the high stretchability of an elastomer when used in polymer composites. Likewise, the high conductivit...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Strain‐Responsive Polyurethane/PEDOT:PSS Elastomeric Composite Fibers with High Electrical Conductivity

Seyedin

Razal

Innis

et al. 2014

Adv Funct Materials

259

235

View full text Add to dashboard Cite

show abstract

“…Textile-based posture sensing solutions have been investigated for different sensors and target applications. Major research areas include the reconstruction of hand gestures with glove-attached accelerometers [1], conductive elastomers [2] or cameras [3,4]. One pioneering project for upper body monitoring was the Georgia Tech Wearable Motherboard [5].…”

Section: Related Workmentioning

confidence: 99%

“…Dunne et al [6] developed a garment-integrated plastic optical fiber for monitoring seated spinal postures in one dimension. Tognetti et al [2] investigated a conductive elastomer, that shows piezoresistive properties when it is deformed. The material was applied in a special layout pattern to the shoulder, elbow and wrist region of a upper limb kinesthetic garment shirt.…”

Section: Related Workmentioning

confidence: 99%

SMASH: A Distributed Sensing and Processing Garment for the Classification of Upper Body Postures

Harms¹,

Amft²,

Tröster³

et al. 2008

Proceedings of the 3rd International ICST Conference on Body Area Networks

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This paper introduces a smart textile for posture classification. A distributed sensing and processing architecture is implemented into a loose fitting long sleeve shirt. Standardized interfaces to remote periphery support the variable placement of different sensor modalities at any location of the textile. The shirt is equipped with acceleration sensors in order to determine the postural resolution and the systems feasibility for applications in movement rehabilitation. For the garment characterization an arm posture measurement method is proposed and applied in a study with 5 users. The classification performance is analyzed on data from overall 8 users, conducting 12 posture types, relevant for shoulder and elbow joint rehabilitation. We present results for different user-modes, with classification rates of 89% for a user-independent evaluation. Moreover, the relation of body dimensions on the posture classification performance are analyzed.

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“…Modulation of resistance and/or capacitance have been the two most common strategies to sense various physical stimuli, such as applied forces and moisture . Piezoresistive sensors in the form of fibers/yarns and printed layers on fabrics have been proposed for monitoring motion, posture, and various physiological signals for patient monitoring and rehabilitation . For pressure measurements, multicore fibers consisting of layers of soft dielectric and conductive polymers or thin metal films, sets of orthogonal fibers, or fabric‐like structures with soft dielectric and conductive fibers have been employed to form capacitive structures.…”

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confidence: 99%

Toward Fully Manufacturable, Fiber Assembly–Based Concurrent Multimodal and Multifunctional Sensors for e‐Textiles

Kapoor

McKnight

Chatterjee

et al. 2018

Adv Materials Technologies

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challenge, however, is to engender electrical functionalities in textiles while preserving the desirable textile qualities such as softness, comfort, flexibility, and texture that arise from its hierarchical structure through the complex interaction of inherent fiber material properties and the characteristic textile structural features at multiple length scales. To this end, among all the different potential routes of incorporating electronic functionalities into textiles, integration of textile fibers performing as electrical devices, on its own or when assembled, seems to provide the most obvious, unobtrusive, and practical means. Appropriately designed flexible fiber-based electronics are fundamentally transformational; they present very attractive possibilities of ease of manufacturing using standard fiber-extrusion, roll-to-roll textile processing technologies, and enable high spatial sensing density with redundancy within the textile structure. The utility of fiber-based electronics has been recognized as a key step for truly mass-produced e-textiles. Accordingly, the constituents (e.g., fibers or yarns) of textile products have been directly fashioned into electrical devices by incorporating appropriate functional design and materials. These include "fiber"shaped photovoltaic devices, [1,2] transistors, [3][4][5] logic circuits, [6,7] sensors, [8,9] actuators, [10][11][12] other electronic/optical devices [13][14][15] in addition to "fabric"-based devices. [16,17] Modulation of resistance and/or capacitance have been the two most common strategies to sense various physical stimuli, such as applied forces [8,18] and moisture. [19,20] Piezoresistive sensors in the form of fibers/yarns and printed layers on fabrics have been proposed for monitoring motion, posture, and various physiological signals for patient monitoring and rehabilitation. [21,22] For pressure measurements, multicore fibers consisting of layers of soft dielectric and conductive polymers or thin metal films, [23,24] sets of orthogonal fibers, [25,26] or fabric-like structures with soft dielectric and conductive fibers [27] have been employed to form capacitive structures. While remarkable progress has been made in e-textiles, practical real-life products in e-textiles remain elusive. Arguably, the most difficult challenge has been the development of truly textile/fiber-compatible materials/devices and practical Soft polymer-based sensors as an integral part of textile structures have attracted considerable scientific and commercial interest recently because of their potential use in healthcare, security systems, and other areas. While electronic sensing functionalities can be incorporated into textiles at one or more of the hierarchical levels of molecules, fibers, yarns, or fabrics, arguably a more practical and inconspicuous means to introduce the desired electrical characteristics is at the fiber level, using processes that are compatible to textiles. Here, a prototype multimodal and multifunctional sensor array formed within a woven fabr...

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Wearable kinesthetic system for capturing and classifying upper limb gesture in post-stroke rehabilitation

Cited by 139 publications

References 11 publications

Strain‐Responsive Polyurethane/PEDOT:PSS Elastomeric Composite Fibers with High Electrical Conductivity

Strain‐Responsive Polyurethane/PEDOT:PSS Elastomeric Composite Fibers with High Electrical Conductivity

SMASH: A Distributed Sensing and Processing Garment for the Classification of Upper Body Postures

Toward Fully Manufacturable, Fiber Assembly–Based Concurrent Multimodal and Multifunctional Sensors for e‐Textiles

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