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https://www.readbyqxmd.com/read/28636323/ultrafast-dynamic-pressure-sensors-based-on-graphene-hybrid-structure
#1
Shanbiao Liu, Xing Wu, Dongdong Zhang, Congwei Guo, Peng Wang, Weida Hu, Xinming Li, Xiaofeng Zhou, Hejun Xu, Chen Luo, Jian Zhang, Jun-Hao Chu
The development of artificial skin is drawing tremendous attention due to its potential applications in sensing a variety of physical quantities, such as tactility, vibration, and temperature. A strain sensor that can mimic and surpass the subtle pressure-sensing properties of natural skin requires rational material design and array-accessible devices. Here, we report a new and facile preparation of a graphene hybrid structure with an ultrafast dynamic pressure response. Graphene oxide nanosheets are used as a surfactant to prevent graphene restacking in aqueous solution...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636322/spirally-structured-conductive-composites-for-highly-stretchable-robust-conductors-and-sensors
#2
Xiaodong Wu, Yangyang Han, Xinxing Zhang, Canhui Lu
Flexible and stretchable electronics are highly desirable for next generation devices. However, stretchability and conductivity are fundamentally difficult to combine for conventional conductive composites, which restricts their widespread applications especially as stretchable electronics. Here, we innovatively develop a new class of highly stretchable and robust conductive composites via a simple and scalable structural approach. Briefly, carbon nanotubes are spray-coated onto a self-adhesive rubber film, followed by rolling up the film completely to create a spirally layered structure within the composites...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632058/assessment-of-model-based-image-matching-for-future-reconstruction-of-unhelmeted-sport-head-impact-kinematics
#3
Gregory J Tierney, Hamed Joodaki, Tron Krosshaug, Jason L Forman, Jeff R Crandall, Ciaran K Simms
Player-to-player contact inherent in many unhelmeted sports means that head impacts are a frequent occurrence. Model-Based Image-Matching (MBIM) provides a technique for the assessment of three-dimensional linear and rotational motion patterns from multiple camera views of a head impact event, but the accuracy is unknown for this application. The goal of this study is to assess the accuracy of the MBIM method relative to reflective marker-based motion analysis data for estimating six degree of freedom head displacements and velocities in a staged pedestrian impact scenario at 40 km/h...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28631474/a-flexible-dual-mode-tactile-sensor-derived-from-three-dimensional-porous-carbon-architecture
#4
Zifeng Wang, Ruijuan Jiang, Guangming Li, Yiyan Chen, Zijie Tang, Yukun Wang, Zhuoxin Liu, Hongbo Jiang, Chunyi Zhi
Detecting and monitoring varieties of human activities is one of the most essential functions and design purposes of different kinds of wearable sensors. Apart from excellent sensitivity and durability, limited by the materials, most of the sensors reported in the literatures are only capable of detecting signals based on sole mechanism. In this work, a dual-mode flexible sensor derived from high temperature pyrolysized 3D carbon sponge (C-Sponge) was proposed as peculiar sensor materials that are able to detect human activities based on fundamentally different mechanisms, either by triboelectric effect or by piezoresistive effect...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631139/a-systematic-review-of-wearable-patient-monitoring-systems-current-challenges-and-opportunities-for-clinical-adoption
#5
Mirza Mansoor Baig, Hamid GholamHosseini, Aasia A Moqeem, Farhaan Mirza, Maria Lindén
The aim of this review is to investigate barriers and challenges of wearable patient monitoring (WPM) solutions adopted by clinicians in acute, as well as in community, care settings. Currently, healthcare providers are coping with ever-growing healthcare challenges including an ageing population, chronic diseases, the cost of hospitalization, and the risk of medical errors. WPM systems are a potential solution for addressing some of these challenges by enabling advanced sensors, wearable technology, and secure and effective communication platforms between the clinicians and patients...
July 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28628594/telehealth-wearable-sensors-and-the-internet-will-they-improve-stroke-outcomes-through-increased-intensity-of-therapy-motivation-and-adherence-to-rehabilitation-programs
#6
Jane H Burridge, Alan Chong W Lee, Ruth Turk, Maria Stokes, Jill Whitall, Ravi Vaidyanathan, Phil Clatworthy, Ann-Marie Hughes, Claire Meagher, Enrico Franco, Lucy Yardley
BACKGROUND AND PURPOSE: Stroke, predominantly a condition of older age, is a major cause of acquired disability in the global population and puts an increasing burden on health care resources. Clear evidence for the importance of intensity of therapy in optimizing functional outcomes is found in animal models, supported by neuroimaging and behavioral research, and strengthened by recent meta-analyses from multiple clinical trials. However, providing intensive therapy using conventional treatment paradigms is expensive and sometimes not feasible because of social and environmental factors...
July 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/28627862/feasibility-and-efficacy-of-wearable-devices-for-upper-limb-rehabilitation-in-patients-with-chronic-stroke-a-randomized-controlled-pilot-study
#7
Li-Fong Lin, Yi-Jia Lin, Zi-Hao Lin, Li-Yun Chuang, Wei-Chun Hsu, Yuan-Hsiang Lin
BACKGROUND: Wearable devices based on inertial measurement units through wireless sensor networks have many applications such as real-time motion monitoring and functional outcome assessment of stroke rehabilitation. However, additional investigations are warranted to validate their clinical value, particularly in detecting the synergy patterns of movements after stroke. AIM: To explore the feasibility and efficacy of wearable devices for upper limb rehabilitation in patients with chronic stroke and to compare the intervention effects (e...
June 19, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28627224/real-time-smart-textile-based-system-to-monitor-pressure-offloading-of-diabetic-foot-ulcers
#8
Andrea Raviglione, Roberto Reif, Maurizio Macagno, Davide Vigano, Justin Schram, David Armstrong
BACKGROUND: The lifetime risk of developing a diabetic foot ulcer (DFU) is at least 25%. A DFU carries a 50% risk for infection and at least 20% of those receive some form of amputation. The most significant parameter that prevents or delays ulcer healing is high plantar pressure. To improve the patient's healing process, the DFU's plantar pressure should remain cumulatively low. Therefore, a tool that continuously measures the DFU loading, and provides real-time feedback can improve the healing outcome...
February 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28627217/using-plantar-electrical-stimulation-to-improve-postural-balance-and-plantar-sensation-among-patients-with-diabetic-peripheral-neuropathy
#9
Bijan Najafi, Talal K Talal, Gurtej Singh Grewal, Robert Menzies, David G Armstrong, Lawrence A Lavery
OBJECTIVE: People with diabetic peripheral neuropathy (DPN) often exhibit deteriorations in motor-performance mainly due to lack of plantar-sensation. The study explored effectiveness of plantar electrical-stimulation therapy to enhance motor-performance among people with DPN. DESIGN AND METHODS: Using a double-blinded model, 28 volunteers with DPN (age: 57.8 ± 10.2 years) were recruited and randomized to either intervention (IG: n = 17) or control (CG: n = 11) group...
February 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28622664/mechanical-imaging-of-soft-tissues-with-a-highly-compliant-tactile-sensing-array
#10
Bin Li, Ye Shi, Adam K Fontecchio, Yon Visell
The mechanical imaging of lumps in tissues via surface measurements can permit the noninvasive detection of disease-related differences in body tissues. In routine clinical palpation, physicians frequently make decisions based on mechanical properties that they infer from tactile information felt via touch, but these examinations currently yield little quantitative information. This has motivated the development of electronic methods for mechanical imaging. However, conventional tactile sensors are rigid, unable to conform to curved geometries, and are not adaptable to the shape of all body parts, limiting their applicability in biomedical sensing applications...
June 13, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28621709/an-unobtrusive-fall-detection-and-alerting-system-based-on-kalman-filter-and-bayes-network-classifier
#11
Jian He, Shuang Bai, Xiaoyi Wang
Falls are one of the main health risks among the elderly. A fall detection system based on inertial sensors can automatically detect fall event and alert a caregiver for immediate assistance, so as to reduce injuries causing by falls. Nevertheless, most inertial sensor-based fall detection technologies have focused on the accuracy of detection while neglecting quantization noise caused by inertial sensor. In this paper, an activity model based on tri-axial acceleration and gyroscope is proposed, and the difference between activities of daily living (ADLs) and falls is analyzed...
June 16, 2017: Sensors
https://www.readbyqxmd.com/read/28621041/extraordinarily-stretchable-all-carbon-collaborative-nanoarchitectures-for-epidermal-sensors
#12
Yichen Cai, Jie Shen, Ziyang Dai, Xiaoxian Zang, Qiuchun Dong, Guofeng Guan, Lain-Jong Li, Wei Huang, Xiaochen Dong
Multifunctional microelectronic components featuring large stretchability, high sensitivity, high signal-to-noise ratio (SNR), and broad sensing range have attracted a huge surge of interest with the fast developing epidermal electronic systems. Here, the epidermal sensors based on all-carbon collaborative percolation network are demonstrated, which consist 3D graphene foam and carbon nanotubes (CNTs) obtained by two-step chemical vapor deposition processes. The nanoscaled CNT networks largely enhance the stretchability and SNR of the 3D microarchitectural graphene foams, endowing the strain sensor with a gauge factor as high as 35, a wide reliable sensing range up to 85%, and excellent cyclic stability (>5000 cycles)...
June 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28615137/stress-measurement-in-surgeons-and-residents-using-a-smart-patch
#13
Mariska Weenk, Alexander P B Alken, Lucien J L P G Engelen, Sebastian J H Bredie, Tom H van de Belt, Harry van Goor
BACKGROUND: Stress may negatively affect surgeons' performance during surgical procedures, jeopardizing patient safety. For measuring stress, complex methods are used that cannot record stress real time. This study reports stress measurements in surgeons and residents using a novel patch sensor to identify activities and risk factors of stress. METHODS: In this explorative study, surgeons and residents wore the HealthPatch™ during all daily activities for 2-3 days...
June 6, 2017: American Journal of Surgery
https://www.readbyqxmd.com/read/28613808/sensitivity-enhanced-wearable-active-voiceprint-sensor-based-on-cellular-polypropylene-piezoelectret
#14
Wenbo Li, Sheng Zhao, Nan Wu, Junwen Zhong, Bo Wang, Shizhe Lin, Shuwen Chen, Fang Yuan, Hulin Jiang, Yongjun Xiao, Bin Hu, Jun Zhou
Wearable active sensors have extensive applications in mobile biosensing and human-machine interaction but require good flexibility, high sensitivity, excellent stability and self-powered feature. In this work, cellular polypropylene (PP) piezoelectret was chosen as the core material of a sensitivity-enhanced wearable active voiceprint sensor (SWAVS) to realize voiceprint recognition. By virtue of dipole orientation control method, the air layers in piezoelectret were efficiently utilized and the current sensitivity was enhanced (from 1...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28613302/all-soft-battery-free-and-wireless-chemical-sensing-platform-based-on-liquid-metal-for-liquid-and-gas-phase-voc-detection
#15
Min-Gu Kim, Hommood Alrowais, Choongsoon Kim, Pyungwoo Yeon, Maysam Ghovanloo, Oliver Brand
Lightweight, flexible, stretchable, and wireless sensing platforms have gained significant attention for personal healthcare and environmental monitoring applications. This paper introduces an all-soft (flexible and stretchable), battery-free, and wireless chemical microsystem using gallium-based liquid metal (eutectic gallium-indium alloy, EGaIn) and poly(dimethylsiloxane) (PDMS), fabricated using an advanced liquid metal thin-line patterning technique based on soft lithography. Considering its flexible, stretchable, and lightweight characteristics, the proposed sensing platform is well suited for wearable sensing applications either on the skin or on clothing...
June 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28613236/a-framework-for-learning-analytics-using-commodity-wearable-devices
#16
Yu Lu, Sen Zhang, Zhiqiang Zhang, Wendong Xiao, Shengquan Yu
We advocate for and introduce LEARNSense, a framework for learning analytics using commodity wearable devices to capture learner's physical actions and accordingly infer learner context (e.g., student activities and engagement status in class). Our work is motivated by the observations that: (a) the fine-grained individual-specific learner actions are crucial to understand learners and their context information; (b) sensor data available on the latest wearable devices (e.g., wrist-worn and eye wear devices) can effectively recognize learner actions and help to infer learner context information; (c) the commodity wearable devices that are widely available on the market can provide a hassle-free and non-intrusive solution...
June 14, 2017: Sensors
https://www.readbyqxmd.com/read/28613085/determining-if-wearable-sensors-affect-infant-leg-movement-frequency
#17
Crystal Jiang, Christianne J Lane, Emily Perkins, Derek Schiesel, Beth A Smith
PURPOSE: There is interest in using wearable sensors to measure infant leg movement patterns; however, they were not developed for infant use and their presence may adversely affect infant movement production. Their weight may discourage leg movement production, or their presence may annoy an infant and encourage higher rates of leg movement production. Our purpose was to determine whether wearable sensors affected the frequency of infant leg movements produced. METHOD: We included 10 infants with typical development and 10 infants at risk of developmental delay, between 2 and 10 months' chronological age...
June 14, 2017: Developmental Neurorehabilitation
https://www.readbyqxmd.com/read/28612929/flexible-organic-inorganic-hybrid-near-infrared-photoplethysmogram-sensor-for-cardiovascular-monitoring
#18
Huihua Xu, Jing Liu, Jie Zhang, Guodong Zhou, Ningqi Luo, Ni Zhao
Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3...
June 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28612635/wearable-sensors-can-they-benefit-patients-with-chronic-kidney-disease
#19
Fokko Pieter Wieringa, Natascha Broers, J P Kooman, Frank M van der Sande, Chris van Hoof
Introduction This article ponders upon wearable medical measurement devices in relation to Chronic Kidney Disease (CKD) and its' associated comorbidities - and whether these might benefit CKD-patients. We aimed to map the intersection(s) of nephrology and wearable sensor technology to help technologists understand medical aspects, and clinicians to understand technological possibilities that are available (or soon will become so). Areas covered A structured literature search on main comorbidities and complications CKD patients suffer from, was used to steer mini-reviews on wearable sensor technologies clustered around 3 themes being: Cardiovascular-related, diabetes-related and physical fitness/frailty...
June 14, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28611621/whole-body-awareness-for-controlling-a-robotic-transfemoral-prosthesis
#20
Andrea Parri, Elena Martini, Joost Geeroms, Louis Flynn, Guido Pasquini, Simona Crea, Raffaele Molino Lova, Dirk Lefeber, Roman Kamnik, Marko Munih, Nicola Vitiello
Restoring locomotion functionality of transfemoral amputees is essential for early rehabilitation treatment and for preserving mobility and independence in daily life. Research in wearable robotics fostered the development of innovative active mechatronic lower-limb prostheses designed with the goal to reduce the cognitive and physical effort of lower-limb amputees in rehabilitation and daily life activities. To ensure benefits to the users, active mechatronic prostheses are expected to be aware of the user intention and properly interact in a closed human-in-the-loop paradigm...
2017: Frontiers in Neurorobotics
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