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pressure sensor

María Jesús Muniesa Royo, Juan Ezpeleta Campaña, Iván Benítez Iglesias
PURPOSE: To compare fluctuations in intraocular pressure (IOP) in medically versus surgically treated glaucoma patients. DESIGN: Prospective, non-randomized case series. METHODS: IOP-related fluctuations were measured for 24 hours using a contact lens sensor (CLS). SUBJECTS: We perform monitoring with CLS in 91 eyes of 77 patients; 59 eyes were receiving ocular hypotensive medication and had no previous history of glaucoma surgery (medical group), while 32 eyes with open angle glaucoma (OAG) had previously undergone glaucoma surgery (surgical group)...
February 13, 2019: American Journal of Ophthalmology
D J Saunders, L Bleasdale, L Summerton, A Hancock, S Homer-Vanniasinkam, D A Russell
OBJECTIVES: To assess the ability of a novel, automated CE marked vascular early warning system (VEWS) device to detect peripheral arterial disease in patients with incompressible ankle arteries and non-measurable ankle brachial pressure index (ABPI) secondary to diabetes. RESEARCH DESIGN AND METHODS: Recruited patients had diabetes, recent MRA evidence of PAD and incompressible vessels on ABPI. VEWS indices of each leg were automatically calculated by employing optical infrared and red sensors applied to the foot with readings obtained with the subject's leg both flat and elevated...
February 12, 2019: Annals of Vascular Surgery
Yong Ju Park, Bhupendra K Sharma, Sachin M Shinde, Min-Seok Kim, Bongkyun Jang, Jae-Hyun Kim, Jong-Hyun Ahn
Large-area, ultra-thin flexible tactile sensors with conformal adherence are becoming crucial for advances in wearable electronics, electronic skins and bio-robotics. However, normal passive tactile sensors suffer from high crosstalk, resulting in inaccurate sensing, which consequently, limits their use in such advanced applications. Active-matrix driven tactile sensors could potentially overcome such hurdles but it demands the high performance and reliable operations of the thin-film-transistor array that could efficiently control integrated pressure gauges...
February 15, 2019: ACS Nano
Alexander Lilja-Cyron, Morten Andresen, Jesper Kelsen, Trine Hjorslev Andreasen, Kåre Fugleholm, Marianne Juhler
BACKGROUND: Decompressive craniectomy (DC) is used in cases of severe intracranial hypertension or impending intracranial herniation. DC effectively lowers intracranial pressure (ICP) but carries a risk of severe complications related to abnormal ICP and/or cerebrospinal fluid (CSF) circulation, eg, hygroma formation, hydrocephalus, and "syndrome of the trephined." OBJECTIVE: To study the long-term effect of DC on ICP, postural ICP regulation, and intracranial pulse wave amplitude (PWA)...
February 15, 2019: Neurosurgery
Wei Gao, Hiroki Ota, Daisuke Kiriya, Kuniharu Takei, Ali Javey
Wearable sensors play a crucial role in realizing personalized medicine, as they can continuously collect data from the human body to capture meaningful health status changes in time for preventive intervention. However, motion artifacts and mechanical mismatches between conventional rigid electronic materials and soft skin often lead to substantial sensor errors during epidermal measurement. Because of its unique properties such as high flexibility and conformability, flexible electronics enables a natural interaction between electronics and the human body...
February 15, 2019: Accounts of Chemical Research
Kh S Karimov, Zubair Ahmad, M Imran Khan, Khalid J Siddiqui, T A Qasuria, S Zameer Abbas, M Usman, Aziz-Ur Rehman
In this work, the elastic layered rubber-graphene composite based multi-functional sensor has been fabricated by rubbing-in technology. The effects of temperature, displacement, pressure and humidity on the impedance of the multi-functional sensor has been investigated in the frequency range of 0-200 kHz. The impedance of the samples decreased under the effect of uniaxial compressive displacement and under the effect of pressure. The temperature coefficient of the samples was found to be -0.836 and -0.862 %/°C with the increase in temperature from 29 °C to 54 °C, respectively, while the impedance of the samples decreased 1...
January 2019: Heliyon
Georges Matar, Jean-Marc Lina, Georges Kaddoum
Pressure ulcer prevention is a vital procedure for patients undergoing long-term hospitalization. A human body lying posture (HBLP) monitoring system is essential to reschedule posture change for patients. Video-surveillance, the conventional method of HBLP monitoring, suffers from various limitations, such as subject's privacy, and field-of view obstruction. We propose an autonomous method for classifying the four state-of-art HBLPs in healthy adult subjects: supine, prone, left and right lateral, with no sensors or cables attached on the body and no constraints imposed on the subject...
February 13, 2019: IEEE Journal of Biomedical and Health Informatics
Yi-Jie Tsai, Chang-Ming Wang, Ta-Sheng Chang, Sanjeeb Sutradhar, Che-Wei Chang, Chong-You Chen, Chia-Han Hsieh, Wei-Ssu Liao
Flexible pressure sensors have attracted increasing interest due to their potential application on wearable sensing devices for human-machine interface connections, but challenges regarding material cost, fabrication robustness, signal transduction, sensitivity improvement, detection range, and operation convenience still need to be overcome. Herein, with a simple, low-cost, and scalable approach, a flexible and wearable pressure sensing device fabricated by utilizing filter paper as solid support, poly(3,4-ethylenedioxythiophene) (PEDOT) to enhance conductivity, and silver nanoparticles (Ag NPs) to provide a rougher surface, is introduced...
February 14, 2019: ACS Applied Materials & Interfaces
Seiichi Takamatsu, Shintaro Goto, Michitaka Yamamoto, Takahiro Yamashita, Takeshi Kobayashi, Toshihiro Itoh
We developed a plastic-scale-model assembly of an ultrathin film piezoresistive microelectromechanical systems (MEMS) strain sensor with a conventional vacuum-suction chip mounter for the application to flexible and wearable strain sensors. A plastic-scale-model MEMS chip consists of 5-μm ultrathin piezoresistive strain sensor film, ultrathin disconnection parts, and a thick outer frame. The chip mounter applies pressure to the ultrathin piezoresistive strain sensor film and cuts the disconnection parts to separate the sensor film from the outer frame...
February 13, 2019: Scientific Reports
Agustina Taglialegna, Maria C Varela, Roberto R Rosato, Adriana E Rosato
Methicillin-resistant Staphylococcus aureus (MRSA) threatens human health in hospital and community settings. The lipopeptide antibiotic daptomycin (DAP) is a frequently used treatment option for MRSA infection. DAP exposure can cause bacterial resistance because mutations are induced in genes implicated in cell membrane and cell wall metabolism. Adaptations aimed at surviving antimicrobial pressure can affect bacterial physiology and modify in vivo aptitude and pathogenesis. In this study, clinical DAP-susceptible (DAPs ) and DAP-resistant (DAPr ) MRSA isolates were used to investigate associations between DAP resistance and staphylococcal virulence...
February 13, 2019: MSphere
Johannes Kapp, Christian Weber, Katrin Schmitt, Hans-Fridtjof Pernau, Jürgen Wöllenstein
Nitrogen dioxide (NO 2 ) is a poisonous trace gas that requires monitoring in urban areas. Accurate measurement in sub-ppm concentrations represents a wide application field for suitable economical sensors. We present a novel approach to measure NO 2 with a photoacoustic sensor using a T-shaped resonance cell. An inexpensive UV-LED with a peak wavelength of 405 nm as radiation source as well as a commercial MEMS microphone for acoustic detection were used. In this work, a cell has been developed that enables a "non-contact" feedthrough of the divergent LED beam...
February 11, 2019: Sensors
Christopher M Jones, Bin Dai, Jimmy Price, Jian Li, Megan Pearl, Bill Soltmann, Michael L Myrick
Multivariate optical computing (MOC) is a compressed sensing technique with the ability to provide accurate spectroscopic compositional analysis in a variety of different applications to multiple industries. Indeed, recent developments have demonstrated the successful deployment of MOC sensors in downhole/well-logging environments to interrogate the composition of hydrocarbon and other chemical constituents in oil and gas reservoirs. However, new challenges have necessitated sensors that operate at high temperatures and pressures (up to 230 °C and 138 MPa) as well as even smaller areas that require the miniaturization of their physical footprint...
February 8, 2019: Sensors
Abdel Kebir Sabil, Martin Glos, Alexandra Günther, Christoph Schöbel, Christian Veauthier, Ingo Fietze, Thomas Penzel
STUDY OBJECTIVES: Evaluation of apnea detection using a tracheal sound (TS) sensor during sleep in patients with obstructive sleep apnea. METHODS: Polysomnographic recordings of 32 patients (25 male, mean age 66.7 ± 15.3 years, and mean body mass index 30.1 ± 4.5 kg/m2) were analyzed to compare the detection of apneas by four different methods of airflow signals: oronasal thermal airflow sensor (thermistor), nasal pressure transducer (NP), respiratory inductance plethysmography (RIPsum) and TS...
February 4, 2019: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
Biljana Jakovljevic, Tamara R Nikolic Turnic, Nevena Jeremic, Maja Savic, Jovana Jeremic, Ivan M Srejovic, Branislav Belic, Nenad Ponorac, Vladimir Jakovljevic, Vladimir I Zivkovic
This study was aimed to assess the impact of high intensity interval training (HIIT) vs. moderate intensity continious training (MIT) on cardiodynamic parameters in isolated rat heart. Wistar albino rats were randomly assigned to groups according to running protocol: sedentary control (CTRL), MIT, HIIT; spontaneous hypertensive sedentary control (SHR), spontaneous hypertensive rats (SHR) + MIT and SHR + HIIT. HIIT groups performed the running in 5 sprints x 45-55m/min for 30-90sec, with 2 mins rest after each sprint, while MIT groups performed the running of 10-15m/min for 1h with 3 mins rest/100m, both protocols were implemented 5 days/week over 4 weeks with one week of adaptation before protocols started...
February 8, 2019: Canadian Journal of Physiology and Pharmacology
Anke Schmidt, Sander Bekeschus, Katja Jarick, Sybille Hasse, Thomas von Woedtke, Kristian Wende
Small reactive oxygen and nitrogen species (ROS/RNS) driven signaling plays a significant role in wound healing processes by controlling cell functionality and wound phase transitions. The application of cold atmospheric pressure plasma (CAP), a partially ionized gas expelling a variety of ROS and RNS, was shown to be effective in chronic wound management and contrastingly also in malignant diseases. The underlying molecular mechanisms are not well understood but redox signaling events are involved. As a central player, the cellular tumor antigen p53 governs regulatory networks controlling proliferation, death, or metabolism, all of which are grossly modulated by anti- and prooxidant signals...
2019: Oxidative Medicine and Cellular Longevity
Jung Han Kim, Tae-Jun Ko, Emmanuel Okogbue, Sang Sub Han, Mashiyat Sumaiya Shawkat, Md Golam Kaium, Kyu Hwan Oh, Hee-Suk Chung, Yeonwoong Jung
Two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers present an unusually ideal combination of excellent opto-electrical properties and mechanical tolerance projecting high promise for a wide range of emerging applications, particularly in flexible and stretchable devices. The prerequisite for realizing such opportunities is to reliably integrate large-area 2D TMDs of well-defined dimensions on mechanically pliable materials with targeted functionalities by transferring them from rigid growth substrates...
February 7, 2019: Scientific Reports
Hugo Dacasa, Hélène Coudert-Alteirac, Chen Guo, Emma Kueny, Filippo Campi, Jan Lahl, Jasper Peschel, Hampus Wikmark, Balázs Major, Erik Malm, Domenico Alj, Katalin Varjú, Cord L Arnold, Guillaume Dovillaire, Per Johnsson, Anne L'Huillier, Sylvain Maclot, Piotr Rudawski, Philippe Zeitoun
We perform wavefront measurements of high-order harmonics using an extreme-ultraviolet (XUV) Hartmann sensor and study how their spatial properties vary with different generation parameters, such as pressure in the nonlinear medium, fundamental pulse energy and duration as well as beam size. In some conditions, excellent wavefront quality (up to λ/11) was obtained. The high throughput of the intense XUV beamline at the Lund Laser Centre allows us to perform single-shot measurements of both the full harmonic beam generated in argon and individual harmonics selected by multilayer mirrors...
February 4, 2019: Optics Express
H Burkhard Dick, Tim Schultz, Ronald D Gerste
In the management of glaucoma, recent and upcoming innovations have the potential to contribute to both the efficacy of intraocular pressure (IOP) monitoring and the number of available treatment options. These new devices and procedures have two things in common: they are part of the trend in medicine towards miniaturization, and they require a limited surgical procedure to become effective. This review focuses on the Eyemate (Argos) intraocular sensor, which offers a new way to reliably measure 24 h IOP, and on intraocular sustained release systems for pharmacological glaucoma therapy...
February 6, 2019: Ophthalmology and Therapy
Xing-Yan Cao, Ming-Shu Bi, Jing-Jie Ren, Biao Chen
The suppression effects of pure ultrafine water mist and 5% mass fraction alkali metal (NaCl, Na2 CO3 , KHCO3 , KCl and K2 CO3 ) solutions ultrafine water mist on methane explosion were conducted under five mist concentrations in a sealed visual vessel. Mist diameters of different additive solutions were measured by a phase doppler particle analyzer. Pressure data and dynamic flame pictures were recorded respectively by a high-frequency pressure sensor and a high-speed camera. Results indicate that alkali metal compound can enhance the suppression effect of ultrafine water mist and it was related to the additive type...
January 30, 2019: Journal of Hazardous Materials
Zhiyong Xia, Vanessa D Alphonse, Doug B Trigg, Tim P Harrigan, Jeff M Paulson, Quang T Luong, Evan P Lloyd, Meredith H Barbee, Stephen L Craig
Several technologies can be used for measuring strains of soft materials under high rate impact conditions. These technologies include high speed tensile test, split Hopkinson pressure bar test, digital image correlation and high speed X-ray imaging. However, none of these existing technologies can produce a continuous 3D spatial strain distribution in the test specimen. Here we report a novel passive strain sensor based on poly(dimethyl siloxane) (PDMS) elastomer with covalently incorporated spiropyran (SP) mechanophore to measure impact induced strains...
February 1, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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