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Wearable devices

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https://www.readbyqxmd.com/read/29675877/design-of-novel-wearable-stretchable-and-waterproof-cable-type-supercapacitors-based-on-high-performance-nickel-cobalt-sulfide-coated-etching-annealed-yarn-electrodes
#1
Yuejiao Chen, Bingang Xu, Jianfeng Wen, Jianliang Gong, Tao Hua, Chi-Wai Kan, Jiwei Deng
Rapid advances in functional electronics bring tremendous demands on innovation toward effective designs of device structures. Yarn supercapacitors (SCs) show advantages of flexibility, knittability, and small size, and can be integrated into various electronic devices with low cost and high efficiency for energy storage. In this work, functionalized stainless steel yarns are developed to support active materials of positive and negative electrodes, which not only enhance capacitance of both electrodes but can also be designed into stretchable configurations...
April 19, 2018: Small
https://www.readbyqxmd.com/read/29675155/effects-of-molecular-architecture-on-morphology-and-photophysics-in-conjugated-polymers-from-single-molecules-to-bulk
#2
REVIEW
Zhongjian Hu, Beiyue Shao, Geoffrey T Geberth, David A Vanden Bout
Conjugated polymers (CPs) possess a wide range of desirable properties, including accessible energetic bandgaps, synthetic versatility, and mechanical flexibility, which make them attractive for flexible and wearable optoelectronic devices. An accurate and comprehensive understanding about the morphology-photophysics relations in CPs lays the groundwork for their development in these applications. However, due to the complex roles of chemical structure, side-chains, backbone, and intramolecular interactions, CPs can exhibit heterogeneity in both their morphology and optoelectronic properties even at the single chain level...
February 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674288/a-flexible-wearable-sensor-for-knee-flexion-assessment-during-gait
#3
Enrica Papi, Yen Nee Bo, Alison H McGregor
BACKGROUND: Gait analysis plays an important role in the diagnosis and management of patients with movement disorders but it is usually performed within a laboratory. Recently interest has shifted towards the possibility of conducting gait assessments in everyday environments thus facilitating long-term monitoring. This is possible by using wearable technologies rather than laboratory based equipment. RESEARCH QUESTION: This study aims to validate a novel wearable sensor system's ability to measure peak knee sagittal angles during gait...
April 13, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29671754/a-review-of-physiological-and-behavioral-monitoring-with-digital-sensors-for-neuropsychiatric-illnesses
#4
Erik Reinertsen, Gari D Clifford
Physiological, behavioral, and psychological changes associated with neuropsychiatric illness are reflected in several related signals, including actigraphy, location, word sentiment, voice tone, social activity, heart rate, and responses to standardized questionnaires. These signals can be passively monitored using sensors in smartphones, wearable accelerometers, Holter monitors, and multimodal sensing approaches that fuse multiple data types. Connection of these devices to the internet has made large scale studies feasible and is enabling a revolution in neuropsychiatric monitoring...
April 19, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29670943/molecular-engineered-conjugated-polymer-with-high-thermal-conductivity
#5
Yanfei Xu, Xiaoxue Wang, Jiawei Zhou, Bai Song, Zhang Jiang, Elizabeth M Y Lee, Samuel Huberman, Karen K Gleason, Gang Chen
Traditional polymers are both electrically and thermally insulating. The development of electrically conductive polymers has led to novel applications such as flexible displays, solar cells, and wearable biosensors. As in the case of electrically conductive polymers, the development of polymers with high thermal conductivity would open up a range of applications in next-generation electronic, optoelectronic, and energy devices. Current research has so far been limited to engineering polymers either by strong intramolecular interactions, which enable efficient phonon transport along the polymer chains, or by strong intermolecular interactions, which enable efficient phonon transport between the polymer chains...
March 2018: Science Advances
https://www.readbyqxmd.com/read/29670758/remote-biomonitoring-of-temperatures-in-mothers-and-newborns-design-development-and-testing-of-a-wearable-sensor-device-in-a-tertiary-care-hospital-in-southern-india
#6
Prem K Mony, Prashanth Thankachan, Swarnarekha Bhat, Suman Rao, Maryann Washington, Sumi Antony, Annamma Thomas, Sheela C Nagarajarao, Hiteshwar Rao, Bharadwaj Amrutur
Objective: Newer technologies such as wearables, sensors, mobile telephony and computing offer opportunities to monitor vital physiological parameters and tackle healthcare problems, thereby improving access and quality of care. We describe the design, development and testing of a wearable sensor device for remote biomonitoring of body temperatures in mothers and newborns in southern India. Methods: Based on client needs and technological requirements, a wearable sensor device was designed and developed using principles of 'social innovation' design...
April 2018: BMJ Innovations
https://www.readbyqxmd.com/read/29670039/a-wearable-body-controlling-device-for-application-of-functional-electrical-stimulation
#7
Nazita Taghavi, Greg R Luecke, Nicholas D Jeffery
In this research, we describe a new balancing device used to stabilize the rear quarters of a patient dog with spinal cord injuries. Our approach uses inertial measurement sensing and direct leg actuation to lay a foundation for eventual muscle control by means of direct functional electrical stimulation (FES). During this phase of development, we designed and built a mechanical test-bed to develop the control and stimulation algorithms before we use the device on our animal subjects. We designed the bionic test-bed to mimic the typical walking gait of a dog and use it to develop and test the functionality of the balancing device for stabilization of patient dogs with hindquarter paralysis...
April 18, 2018: Sensors
https://www.readbyqxmd.com/read/29668756/on-the-security-of-consumer-wearable-devices-in-the-internet-of-things
#8
Hasan Tahir, Ruhma Tahir, Klaus McDonald-Maier
Miniaturization of computer hardware and the demand for network capable devices has resulted in the emergence of a new class of technology called wearable computing. Wearable devices have many purposes like lifestyle support, health monitoring, fitness monitoring, entertainment, industrial uses, and gaming. Wearable devices are hurriedly being marketed in an attempt to capture an emerging market. Owing to this, some devices do not adequately address the need for security. To enable virtualization and connectivity wearable devices sense and transmit data, therefore it is essential that the device, its data and the user are protected...
2018: PloS One
https://www.readbyqxmd.com/read/29668484/flexible-gas-sensor-based-on-graphene-ethyl-cellulose-nanocomposite-with-ultra-low-strain-response-for-volatile-organic-compounds-rapid-detection
#9
Qiankun Zhang, Chunhua An, Shuangqing Fan, Sigang Shi, Rongjie Zhang, Jing Zhang, Quanning Li, Daihua Zhang, Xiaodong Hu, Jing Liu
Minimizing the strain induced undesirable effects is one of the major efforts to be made for flexible electronics. This work reports a highly sensitive flexible gas sensor with ultra-low strain response, which is potentially suitable for wearable electronics applications. The gas sensing material is a free-standing and flexible thin film made of graphene/ethyl cellulose (EC) nanocomposite, which is then integrated with flexible substrate of polyethylene terephthalate. The sensor exhibits relative resistance change within 0...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29668452/can-wearable-devices-accurately-measure-heart-rate-variability-a-systematic-review
#10
REVIEW
Konstantinos Georgiou, Andreas V Larentzakis, Nehal N Khamis, Ghadah I Alsuhaibani, Yasser A Alaska, Elias J Giallafos
BACKGROUND: A growing number of wearable devices claim to provide accurate, cheap and easily applicable heart rate variability (HRV) indices. This is mainly accomplished by using wearable photoplethysmography (PPG) and/or electrocardiography (ECG), through simple and non-invasive techniques, as a substitute of the gold standard RR interval estimation through electrocardiogram. Although the agreement between pulse rate variability (PRV) and HRV has been evaluated in the literature, the reported results are still inconclusive especially when using wearable devices...
March 1, 2018: Folia Medica
https://www.readbyqxmd.com/read/29667365/flexible-and-high-performance-all-2d-photodetector-for-wearable-devices
#11
Jiandong Yao, Guowei Yang
Emerging novel applications at the forefront of innovation horizon raise new requirements including good flexibility and unprecedented properties for the photoelectronic industry. On account of diversity in transport and photoelectric properties, 2D layered materials have proven as competent building blocks toward next-generation photodetectors. Herein, an all-2D Bi2 Te3 -SnS-Bi2 Te3 photodetector is fabricated with pulsed-laser deposition. It is sensitive to broadband wavelength from ultraviolet (370 nm) to near-infrared (808 nm)...
April 18, 2018: Small
https://www.readbyqxmd.com/read/29667028/a-review-of-commercial-and-medical-grade-physiological-monitoring-devices-for-biofeedback-assisted-quality-of-life-improvement-studies
#12
Pedro Nogueira, Joana Urbano, Luís Paulo Reis, Henrique Lopes Cardoso, Daniel Castro Silva, Ana Paula Rocha, Joaquim Gonçalves, Brígida Mónica Faria
With the rise in wearable technology and "health culture", we are seeing an increasing interest and affordances in studying how to not only prolong life expectancy but also in how to improve individuals' quality of life. On the one hand, this attempts to give meaning to the increasing life expectancy, as living above a certain threshold of pain and lack of autonomy or mobility is both degrading and unfair. On the other hand, it lowers the cost of continuous care, as individuals with high quality of life indexes tend to have lower hospital readmissions or secondary complications, not to mention higher physical and mental health...
April 17, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29666257/thermally-stable-highly-efficient-ultraflexible-organic-photovoltaics
#13
Xiaomin Xu, Kenjiro Fukuda, Akchheta Karki, Sungjun Park, Hiroki Kimura, Hiroaki Jinno, Nobuhiro Watanabe, Shuhei Yamamoto, Satoru Shimomura, Daisuke Kitazawa, Tomoyuki Yokota, Shinjiro Umezu, Thuc-Quyen Nguyen, Takao Someya
Flexible photovoltaics with extreme mechanical compliance present appealing possibilities to power Internet of Things (IoT) sensors and wearable electronic devices. Although improvement in thermal stability is essential, simultaneous achievement of high power conversion efficiency (PCE) and thermal stability in flexible organic photovoltaics (OPVs) remains challenging due to the difficulties in maintaining an optimal microstructure of the active layer under thermal stress. The insufficient thermal capability of a plastic substrate and the environmental influences cannot be fully expelled by ultrathin barrier coatings...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29666045/general-practitioners-perspective-on-ehealth-and-lifestyle-change-qualitative-interview-study
#14
Carl Joakim Brandt, Gabrielle Isidora Søgaard, Jane Clemensen, Jens Sndergaard, Jesper Bo Nielsen
BACKGROUND: Wearables, fitness apps, and patient home monitoring devices are used increasingly by patients and other individuals with lifestyle challenges. All Danish general practitioners (GPs) use digital health records and electronic health (eHealth) consultations on a daily basis, but how they perceive the increasing demand for lifestyle advice and whether they see eHealth as part of their lifestyle support should be explored further. OBJECTIVE: This study aimed to explore GPs' perspectives on eHealth devices and apps and the use of eHealth in supporting healthy lifestyle behavior for their patients and themselves...
April 17, 2018: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29665217/ultrahigh-conductive-copper-large-flake-size-graphene-heterostructure-thin-film-with-remarkable-electromagnetic-interference-shielding-effectiveness
#15
Zhe Wang, Boyang Mao, Qianlong Wang, Jun Yu, Jixiang Dai, Rongguo Song, Zonghua Pu, Daping He, Zhi Wu, Shichun Mu
To guarantee the normal operation of next generation portable electronics and wearable devices, together with avoiding electromagnetic wave pollution, it is urgent to find a material possessing flexibility, ultrahigh conductive, and superb electromagnetic interference shielding effectiveness (EMI SE) simultaneously. In this work, inspired by a building bricks toy with the interlock system, we design and fabricate a copper/large flake size graphene (Cu/LG) composite thin film (≈8.8 μm) in the light of high temperature annealing of a large flake size graphene oxide film followed by magnetron sputtering of copper...
April 17, 2018: Small
https://www.readbyqxmd.com/read/29665206/defect-free-highly-uniform-washable-transparent-electrodes-induced-by-selective-light-irradiation
#16
Zhaoyang Zhong, Kyoohee Woo, Inhyuk Kim, Hyuntae Kim, Pyeongsam Ko, Dongwoo Kang, Sin Kwon, Hyunchang Kim, Hongseok Youn, Jooho Moon
A simple route to fabricate defect-free Ag-nanoparticle-carbon-nanotube composite-based high-resolution mesh flexible transparent conducting electrodes (FTCEs) is explored. In the selective photonic sintering-based patterning process, a highly soft rubber or thin plastic substrate is utilized to achieve close and uniform contact between the composite layer and photomask, with which uniform light irradiation can be obtained with diminished light diffraction. This well-controlled process results in developing a fine and uniform mesh pattern (≈12 μm)...
April 17, 2018: Small
https://www.readbyqxmd.com/read/29663540/extreme-toughening-of-soft-materials-with-liquid-metal
#17
Navid Kazem, Michael D Bartlett, Carmel Majidi
Soft and tough materials are critical for engineering applications in medical devices, stretchable and wearable electronics, and soft robotics. Toughness in synthetic materials is mostly accomplished by increasing energy dissipation near the crack tip with various energy dissipation techniques. However, bio-materials exhibit extreme toughness by combining multi-scale energy dissipation with the ability to deflect and blunt an advancing crack tip. Here, we demonstrate a synthetic materials architecture that also exhibits multi-modal toughening, whereby embedding a suspension of micron sized and highly deformable liquid metal (LM) droplets inside a soft elastomer, the fracture energy dramatically increases by up to 50x (from 250 ± 50 J m-2 to 11,900 ± 2600 J m-2 ) over an unfilled polymer...
April 16, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29663532/ionic-gel-modulation-of-rkky-interactions-in-synthetic-anti-ferromagnetic-nanostructures-for-low-power-wearable-spintronic-devices
#18
Qu Yang, Ziyao Zhou, Liqian Wang, Hongjia Zhang, Yuxin Cheng, Zhongqiang Hu, Bin Peng, Ming Liu
To meet the demand of developing compatible and energy-efficient flexible spintronics, voltage manipulation of magnetism on soft substrates is in demand. Here, a voltage tunable flexible field-effect transistor structure by ionic gel (IG) gating in perpendicular synthetic anti-ferromagnetic nanostructure is demonstrated. As a result, the interlayer Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction can be tuned electrically at room temperature. With a circuit gating voltage, anti-ferromagnetic (AFM) ordering is enhanced or converted into an AFM-ferromagnetic (FM) intermediate state, accompanying with the dynamic domain switching...
April 16, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29662908/portable-brain-computer-interface-for-the-intensive-care-unit-patient-communication-using-subject-dependent-ssvep-identification
#19
Omid Dehzangi, Muhamed Farooq
A major predicament for Intensive Care Unit (ICU) patients is inconsistent and ineffective communication means. Patients rated most communication sessions as difficult and unsuccessful. This, in turn, can cause distress, unrecognized pain, anxiety, and fear. As such, we designed a portable BCI system for ICU communications (BCI4ICU) optimized to operate effectively in an ICU environment. The system utilizes a wearable EEG cap coupled with an Android app designed on a mobile device that serves as visual stimuli and data processing module...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29662765/a-wearable-exoskeleton-suit-for-motion-assistance-to-paralysed-patients
#20
Bing Chen, Chun-Hao Zhong, Xuan Zhao, Hao Ma, Xiao Guan, Xi Li, Feng-Yan Liang, Jack Chun Yiu Cheng, Ling Qin, Sheung-Wai Law, Wei-Hsin Liao
Background/Objective: The number of patients paralysed due to stroke, spinal cord injury, or other related diseases is increasing. In order to improve the physical and mental health of these patients, robotic devices that can help them to regain the mobility to stand and walk are highly desirable. The aim of this study is to develop a wearable exoskeleton suit to help paralysed patients regain the ability to stand up/sit down (STS) and walk. Methods: A lower extremity exoskeleton named CUHK-EXO was developed with considerations of ergonomics, user-friendly interface, safety, and comfort...
October 2017: Journal of Orthopaedic Translation
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