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https://www.readbyqxmd.com/read/29118693/design-of-a-soft-robotic-elbow-sleeve-with-passive-and-intent-controlled-actuation
#1
Tze Hui Koh, Nicholas Cheng, Hong Kai Yap, Chen-Hua Yeow
The provision of continuous passive, and intent-based assisted movements for neuromuscular training can be incorporated into a robotic elbow sleeve. The objective of this study is to propose the design and test the functionality of a soft robotic elbow sleeve in assisting flexion and extension of the elbow, both passively and using intent-based motion reinforcement. First, the elbow sleeve was developed, using elastomeric and fabric-based pneumatic actuators, which are soft and lightweight, in order to address issues of non-portability and poor alignment with joints that conventional robotic rehabilitation devices are faced with...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29111556/mechano-responsive-lateral-buckling-of-miniaturized-beams-standing-on-flexible-substrates
#2
Hyemin Lee, Jung Gun Bae, Won Bo Lee, Hyunsik Yoon
We fabricate an elastomeric beam standing on a flexible substrate using 3D printing and soft lithography and investigate lateral buckling generated in the part of the wall when this beam is under pure bending. We also observe changes in the morphology of wrinkling along the applied strain and geometry of the wall, and then analyze it with scaling concepts. Furthermore, the degree of lateral buckling is controlled through the tip design in the ratchet structure and it is verified with finite element simulation...
November 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/29103436/effectiveness-of-pulsed-electromagnetic-field-for-pain-caused-by-placement-of-initial-orthodontic-wire-in-female-orthodontic-patients-a-preliminary-single-blind-randomized-clinical-trial
#3
Jin-Gon Jung, Jae Hyun Park, Sang-Cheol Kim, Kyung-Hwa Kang, Jin-Hyoung Cho, Jin-Woo Cho, Na-Young Chang, R Curtis Bay, Jong-Moon Chae
INTRODUCTION: The purpose of this 2-arm parallel trial was to assess the effects of pulsed electromagnetic field (PEMF) on the reduction of pain caused by initial orthodontic tooth movement. METHODS: Thirty-three female patients (mean age, 16.8 ± 3.8 years) who began orthodontic treatment using fixed appliances were examined. In the pilot study, male patients were less likely to use the PEMF device (epatchQ; Speed Dental, Seoul, Korea) and answer a survey consistently, so eligibility criteria were female patients who were periodontally and systemically healthy at the initiation of treatment and had no history of dental pain in the prior 2 weeks or who used no medications (anti-inflammatory or analgesic drugs) during the experiment period...
November 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29094469/afm-and-nanoindentation-investigation-of-pdms-elastomeric-substrate-compliancy-for-various-sputtered-thin-film-morphologies
#4
Debashis Maji, Soumen Das
Crack free electrically continuous metal thin films over soft elastomeric substrates play an integral part in realization of modern day flexible bio-electronics and biosensors. Under non-optimized deposition conditions, delamination and/or cracking of the top film as well as the underlying soft substrate hinders optimal performance of these devices. Hence it is very important to understand and control not only the various deposition factors like power, time or deposition pressure but also investigate the various interfacial physics playing a critical role in assuring thin film adhesion and substrate compliancy...
November 1, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29079137/evaluation-of-9-health-care-organizations-respiratory-protection-programs-and-respiratory-protective-device-practices-implications-for-adoption-of-elastomerics
#5
Linda Morris Brown, Bonnie Rogers, Kathleen Buckheit, John Pat Curran
Interview, observational, and discussion group data at 9 health care organizations (HCOs) were collected to better understand elastomeric half-facepiece respirators' (EHFRs) use. We found that HCOs do not routinely use EHFRs as a respiratory protection device (RPD) for health care workers; compliance with other respirator types was less than expected. This finding has important training implications for proper use of all RPDs and EHFRs as an alternative RPD stockpiled for use during a respiratory infectious outbreak...
October 24, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/29078394/three-dimensional-mesostructures-as-high-temperature-growth-templates-electronic-cellular-scaffolds-and-self-propelled-microrobots
#6
Zheng Yan, Mengdi Han, Yan Shi, Adina Badea, Yiyuan Yang, Ashish Kulkarni, Erik Hanson, Mikhail E Kandel, Xiewen Wen, Fan Zhang, Yiyue Luo, Qing Lin, Hang Zhang, Xiaogang Guo, Yuming Huang, Kewang Nan, Shuai Jia, Aaron W Oraham, Molly B Mevis, Jaeman Lim, Xuelin Guo, Mingye Gao, Woomi Ryu, Ki Jun Yu, Bruno G Nicolau, Aaron Petronico, Stanislav S Rubakhin, Jun Lou, Pulickel M Ajayan, Katsuyo Thornton, Gabriel Popescu, Daining Fang, Jonathan V Sweedler, Paul V Braun, Haixia Zhang, Ralph G Nuzzo, Yonggang Huang, Yihui Zhang, John A Rogers
Recent work demonstrates that processes of stress release in prestrained elastomeric substrates can guide the assembly of sophisticated 3D micro/nanostructures in advanced materials. Reported application examples include soft electronic components, tunable electromagnetic and optical devices, vibrational metrology platforms, and other unusual technologies, each enabled by uniquely engineered 3D architectures. A significant disadvantage of these systems is that the elastomeric substrates, while essential to the assembly process, can impose significant engineering constraints in terms of operating temperatures and levels of dimensional stability; they also prevent the realization of 3D structures in freestanding forms...
October 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29039648/modular-elastomer-photoresins-for-digital-light-processing-additive-manufacturing
#7
Carl J Thrasher, Johanna J Schwartz, Andrew J Boydston
A series of photoresins suitable for the production of elastomeric objects via digital light processing additive manufacturing are reported. Notably, the printing procedure is readily accessible using only entry-level equipment under ambient conditions using visible light projection. The photoresin formulations were found to be modular in nature, and straightforward adjustments to the resin components enabled access to a range of compositions and mechanical properties. Collectively, the series includes silicones, hydrogels, and hybrids thereof...
November 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28989338/chemical-sensing-systems-that-utilize-soft-electronics-on-thin-elastomeric-substrates-with-open-cellular-designs
#8
Yoon Kyeung Lee, Kyung-In Jang, Yinji Ma, Ahyeon Koh, Hang Chen, Han Na Jung, Yerim Kim, Jean Won Kwak, Liang Wang, Yeguang Xue, Yiyuan Yang, Wenlong Tian, Yu Jiang, Yihui Zhang, Xue Feng, Yonggang Huang, John A Rogers
A collection of materials and device architectures are introduced for thin, stretchable arrays of ion sensors that mount on open cellular substrates to facilitate solution exchange for use in biointegrated electronics. The results include integration strategies and studies of fundamental characteristics in chemical sensing and mechanical response. The latter involves experimental measurements and theoretical simulations that establish important considerations in the design of low modulus, stretchable properties in cellular substrates, and in the realization of advanced capabilities in spatiotemporal mapping of chemicals' gradients...
March 3, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28984435/highly-sensitive-piezocapacitive-sensor-for-detecting-static-and-dynamic-pressure-using-ion-gel-thin-films-and-conductive-elastomeric-composites
#9
Sun Geun Yoon, Byoung Joon Park, Suk Tai Chang
A new class of simple and highly sensitive piezocapacitive sensors that are capable of detecting static and dynamic pressure changes is reported. The pressure sensor structure is formed by vertically sandwiching a sandpaper-molded carbon nanotube/poly(dimethylsiloxane) composite (CPC) dielectric layer between two ion-gel thin film electrodes. Such a capacitive sensor system enables the distinguishable detection of directional movement of applied pressure as well as static pressure variation by modulating ion distribution in the ion-gel thin films...
October 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28970775/engineered-elastomer-substrates-for-guided-assembly-of-complex-3d-mesostructures-by-spatially-nonuniform-compressive-buckling
#10
Kewang Nan, Haiwen Luan, Zheng Yan, Xin Ning, Yiqi Wang, Ao Wang, Juntong Wang, Mengdi Han, Matthew Chang, Kan Li, Yutong Zhang, Wen Huang, Yeguang Xue, Yonggang Huang, Yihui Zhang, John A Rogers
Approaches capable of creating three-dimensional (3D) mesostructures in advanced materials (device-grade semiconductors, electroactive polymers etc.) are of increasing interest in modern materials research. A versatile set of approaches exploits transformation of planar precursors into 3D architectures through the action of compressive forces associated with release of prestrain in a supporting elastomer substrate. Although a diverse set of 3D structures can be realized in nearly any class of material in this way, all previously reported demonstrations lack the ability to vary the degree of compression imparted to different regions of the 2D precursor, thus constraining the diversity of 3D geometries...
January 5, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28948240/ultrasonic-needle-tracking-with-a-fibre-optic-ultrasound-transmitter-for-guidance-of-minimally-invasive-fetal-surgery
#11
Wenfeng Xia, Sacha Noimark, Sebastien Ourselin, Simeon J West, Malcolm C Finlay, Anna L David, Adrien E Desjardins
Ultrasound imaging is widely used for guiding minimally invasive procedures, including fetal surgery. Visualisation of medical devices such as medical needles is critically important and it remains challenging in many clinical contexts. During in-plane insertions, a needle can have poor visibility at steep insertion angles and at large insertion depths. During out-of-plane insertions, the needle tip can have a similar ultrasonic appearance to the needle shaft when it intersects with the ultrasound imaging plane...
September 2017: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/28931933/buckling-structured-stretchable-pseudocapacitor-yarn
#12
Duck Weon Lee, Jung Han Lee, Nam Ki Min, Joon-Hyung Jin
Cable-type stretchable electrochemical pseudocapacitors based on multi-walled carbon nanotube (MWCNT) sheets and two different metal oxide nanopowders (NP), i.e., MnO2 and RuO2 are developed using a newly-devised dry painting method to mechanically fix the NP to the elastic rubber-based MWCNT electrode substrate, resulting in a porous buckling structured pseudocapacitor yarn. Highly stretchable stylene-ethylene/butylene-stylene (SEBS) is used as the supporting elastomeric core for wrapping with the MWCNT sheets and the electroactive NP...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28923968/soft-tubular-microfluidics-for-2d-and-3d-applications
#13
Wang Xi, Fang Kong, Joo Chuan Yeo, Longteng Yu, Surabhi Sonam, Ming Dao, Xiaobo Gong, Chwee Teck Lim
Microfluidics has been the key component for many applications, including biomedical devices, chemical processors, microactuators, and even wearable devices. This technology relies on soft lithography fabrication which requires cleanroom facilities. Although popular, this method is expensive and labor-intensive. Furthermore, current conventional microfluidic chips precludes reconfiguration, making reiterations in design very time-consuming and costly. To address these intrinsic drawbacks of microfabrication, we present an alternative solution for the rapid prototyping of microfluidic elements such as microtubes, valves, and pumps...
October 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28892612/medium-chain-length-polyhydroxyalkanoate-copolymer-modified-by-bacterial-cellulose-for-medical-devices
#14
Denis Mihaela Panaitescu, Irina Lupescu, Adriana Nicoleta Frone, Ioana Chiulan, Cristian Andi Nicolae, Vlad Tofan, Amalia Stefaniu, Raluca Somoghi, Roxana Trusca
Medium chain-length polyhydroxyalkanoates (mPHAs) are flexible elastomeric biopolymers with valuable properties for biomedical applications like artificial arteries and other medical implants. However, an environmentally friendly and high productivity process together with the tuning of the mechanical and biological properties of mPHAs are mandatory for this purpose. Here, for the first time, a melt processing technique was applied for the preparation of bionanocomposites starting from poly(3-hydroxyoctanoate) (PHO) and bacterial cellulose nanofibers (BC)...
September 27, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28887503/stretchable-conductive-elastomer-for-wireless-wearable-communication-applications
#15
Zhibo Chen, Jingtian Xi, Wei Huang, Matthew M F Yuen
Wearable devices have provided noninvasive and continuous monitoring of physiological parameters in healthcare applications. However, for the comfortable applications of wearable devices on human body, two key requirements are to replace conventional bulky devices into soft and deformable ones and to have wireless wearable communication. In this paper we present a simple, low-cost and highly efficient all-elastomeric conductor that can be used in a soft radio-frequency (RF) transmission line and antenna. We show a stretchable transmission line and two stretchable antennas fabricated with conventional screen printing...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28882019/usefulness-of-hospital-at-home-in-nosocomial-infections-advantages-and-limitations
#16
REVIEW
V J González Ramallo, M Mirón Rubio, O Estrada Cuxart, M E García Leoni
Hospital at Home units allows ambulatory treatment and monitoring of complex and serious infections. Nosocomial infections produce an extension of the stay in hospital often specifying long intravenous treatments without any effective oral alternatives. Daily dosing of antimicrobial are easier to administer at home. The use of portable programmable pump infusion and elastomeric devices allow efficient and safe infu-sions for most antimicrobials at home. Some antibiotics against multidrug-resistant organisms of recent introduction have a suitable profile for outpatient intravenous treatment...
September 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/28878564/nonlinear-electroelasticity-material-properties-continuum-theory-and-applications
#17
REVIEW
Luis Dorfmann, Ray W Ogden
In the last few years, it has been recognized that the large deformation capacity of elastomeric materials that are sensitive to electric fields can be harnessed for use in transducer devices such as actuators and sensors. This has led to the reassessment of the mathematical theory that is needed for the description of the electromechanical (in particular, electroelastic) interactions for purposes of material characterization and prediction. After a review of the key experiments concerned with determining the nature of the electromechanical interactions and a discussion of the range of applications to devices, we provide a short account of the history of developments in the nonlinear theory...
August 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28875572/hybrid-3d-printing-of-soft-electronics
#18
Alexander D Valentine, Travis A Busbee, John William Boley, Jordan R Raney, Alex Chortos, Arda Kotikian, John Daniel Berrigan, Michael F Durstock, Jennifer A Lewis
Hybrid 3D printing is a new method for producing soft electronics that combines direct ink writing of conductive and dielectric elastomeric materials with automated pick-and-place of surface mount electronic components within an integrated additive manufacturing platform. Using this approach, insulating matrix and conductive electrode inks are directly printed in specific layouts. Passive and active electrical components are then integrated to produce the desired electronic circuitry by using an empty nozzle (in vacuum-on mode) to pick up individual components, place them onto the substrate, and then deposit them (in vacuum-off mode) in the desired location...
September 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28872882/two-dimensional-active-tuning-of-an-aluminum-plasmonic-array-for-full-spectrum-response
#19
Ming Lun Tseng, Jian Yang, Michael Semmlinger, Chao Zhang, Peter Nordlander, Naomi J Halas
Color pixels composed of plasmonic nanostructures provide a highly promising approach for new display technologies, capable of vivid, robust coloration and incorporating the use of low-cost plasmonic materials, such as aluminum. Here we report a plasmonic device that can be tuned continuously across the entire visible spectrum, based on integrating a square array of aluminum nanostructures into an elastomeric substrate. By stretching the substrate in either of its two dimensions, the period and therefore the scattering color can be modified to the blue or the red of the at-rest structure, spanning the entire visible spectrum...
October 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28844381/assessment-of-half-mask-elastomeric-respirator-and-powered-air-purifying-respirator-reprocessing-for-an-influenza-pandemic
#20
Caryn Lawrence, Delbert A Harnish, Megan Sandoval-Powers, Devin Mills, Michael Bergman, Brian K Heimbuch
BACKGROUND: Health care facilities are considering the use of reusable respiratory protective devices (RPDs) to mitigate a potential N95 filtering facepiece respirator shortage caused by an influenza pandemic. US regulators are also considering stockpiling reusable RPDs for pandemic preparedness, but limited data exist on the effectiveness of cleaning and disinfection of these devices. This study defines reprocessing protocols and evaluates their effectiveness against a pandemic influenza strain in a laboratory setting...
August 22, 2017: American Journal of Infection Control
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