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Elastomeric device

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https://www.readbyqxmd.com/read/29328788/the-role-of-elastomeric-pumps-in-postoperative-analgesia-in-orthopaedics-and-factors-affecting-their-flow-rate
#1
Anthony Andreas Theodorides
Elastomeric pumps are mechanical devices composed of an elastomeric balloon reservoir into which the drug to be infused is stored, a protective casing (used by some manufacturers), a flow controller and a wound catheter. In orthopaedics they are used to provide continuous local infiltration analgesia. In this way patients rely less on other routes of analgesia and thus avoid their systemic side effects. Studies have shown good response to analgesia with these pumps for the first 24 hours but their benefit is not as clear at 48 and 72 hours...
December 2017: Journal of Perioperative Practice
https://www.readbyqxmd.com/read/29325208/bioinspired-universal-flexible-elastomer-based-microchannels
#2
Feng Wu, Songyue Chen, Baiyi Chen, Miao Wang, Lingli Min, Jack Alvarenga, Jie Ju, Ali Khademhosseini, Yuxing Yao, Yu Shrike Zhang, Joanna Aizenberg, Xu Hou
Flexible and stretchable microscale fluidic devices have a broad range of potential applications, ranging from electronic wearable devices for convenient digital lifestyle to biomedical devices. However, simple ways to achieve stable flexible and stretchable fluidic microchannels with dynamic liquid transport have been challenging because every application for elastomeric microchannels is restricted by their complex fabrication process and limited material selection. Here, a universal strategy for building microfluidic devices that possess exceptionally stable and stretching properties is shown...
January 11, 2018: Small
https://www.readbyqxmd.com/read/29241032/biomimetic-elastomeric-conductive-and-biodegradable-polycitrate-based-nanocomposites-for-guiding-myogenic-differentiation-and-skeletal-muscle-regeneration
#3
Yuzhang Du, Juan Ge, Yannan Li, Peter X Ma, Bo Lei
Artificial muscle-like biomaterials have gained tremendous interests owing to their broad applications in regenerative medicine, wearable devices, bioelectronics and artificial intelligence. Unfortunately, key challenges are still existed for current materials, including biomimetic viscoelasticity, biocompatibility and biodegradation, multifunctionality. Herein, for the first time, we develop highly elastomeric, conductive and biodegradable poly (citric acid-octanediol-polyethylene glycol)(PCE)-graphene (PCEG) nanocomposites, and demonstrate their applications in myogenic differentiation and guiding skeletal muscle tissue regeneration...
December 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/29235521/infrared-actuation-induced-simultaneous-reconfiguration-of-surface-color-and-morphology-for-soft-robotics
#4
Seyedali Banisadr, Jian Chen
Cephalopods, such as cuttlefish, demonstrate remarkable adaptability to the coloration and texture of their surroundings by modulating their skin color and surface morphology simultaneously, for the purpose of adaptive camouflage and signal communication. Inspired by this unique feature of cuttlefish skins, we present a general approach to remote-controlled, smart films that undergo simultaneous changes of surface color and morphology upon infrared (IR) actuation. The smart film has a reconfigurable laminated structure that comprises an IR-responsive nanocomposite actuator layer and a mechanochromic elastomeric photonic crystal layer...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29210486/4d-printed-actuators-with-soft-robotic-functions
#5
María López-Valdeolivas, Danqing Liu, Dick Jan Broer, Carlos Sánchez-Somolinos
Soft matter elements undergoing programed, reversible shape change can contribute to fundamental advance in areas such as optics, medicine, microfluidics, and robotics. Crosslinked liquid crystalline polymers have demonstrated huge potential to implement soft responsive elements; however, the complexity and size of the actuators are limited by the current dominant thin-film geometry processing toolbox. Using 3D printing, stimuli-responsive liquid crystalline elastomeric structures are created here. The printing process prescribes a reversible shape-morphing behavior, offering a new paradigm for active polymer system preparation...
December 6, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29187125/nitro-oleic-acid-no2oa-release-enhances-regional-angiogenesis-in-a-rat-abdominal-wall-defect-model
#6
Antonio D'Amore, Marco Fazzari, Hongbin Jiang, Samuel K Luketich, Michael E Luketich, Richard F Hoff, Daniel L Jacobs, Xinzhu Gu, Stephen F Badylak, Bruce A Freeman, William R Wagner
Ventral hernia is often addressed surgically by the placement of prosthetic materials, either synthetic or from allogeneic and xenogeneic biologic sources. Despite advances in surgical approaches and device design, a number of postsurgical limitations remain, including hernia recurrence, mesh encapsulation, and reduced vascularity of the implanted volume. The in situ controlled release of angiogenic factors from a scaffold facilitating abdominal wall repair might address some of these issues associated with sub-optimal tissue reconstruction...
November 29, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29183690/home-based-intravenous-analgesia-with-elastomeric-pump-as-an-outpatient-procedure-for-pain-control-after-anterior-cruciate-ligament-repair
#7
J Villalba, J Peñalver, P Torner, M Serra, J Planell
OBJECTIVE: To follow up pain in the immediate postoperative period, using an elastomeric pump in anterior cruciate ligament surgery. MATERIAL AND METHODS: 309 patients who had undergone anterior cruciate ligament repair with bone-tendon-bone allograft. Pain control was assessed with a visual analogue scale (VAS) during the immediate postoperative period, in the postoperative care unit, in the recovery room, and after the first 24-48-72hours following home discharge...
November 25, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/29160403/quantification-of-streptococcus-mutans-in-different-types-of-ligature-wires-and-elastomeric-chains
#8
Mariana Umekita Shirozaki, José Tarcísio Lima Ferreira, Erika Calvano Küchler, Mírian Aiko Nakane Matsumoto, Carolina Patrícia Aires, Paulo Nelson-Filho, Fábio Lourenço Romano
This study aimed to test the hypothesis that Streptococcus mutans contamination levels differ according to the type of the orthodontic ligature. Thirteen patients were selected. Each quadrant was randomly subjected to one of the following ligature-use protocols: I) elastomeric chain, II) steel ligature crossed over the archwire, III) steel ligature crossed under the archwire, and IV) steel ligature in a figure-eight pattern under the archwire. After seven days, the devices were removed and the Streptococcus mutans colony-forming unit count per mg of biofilm weight was determined...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29118693/design-of-a-soft-robotic-elbow-sleeve-with-passive-and-intent-controlled-actuation
#9
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
#10
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 22, 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
#11
RANDOMIZED CONTROLLED TRIAL
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
#12
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
#13
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
#14
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...
November 7, 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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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