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David N Ku, Lauren D C Casa, Susan M Hastings
Intravascular thrombosis can lead to heart attacks and strokes that together are the leading causes of death in the US (Kochanek, K.D., Murphy, S.L., Xu, J.Q., 2014). The ability to identify the offending biofluid mechanical conditions and predict the timescale of thrombotic occlusion in vessels and devices may improve patient outcomes. A computational model was developed to describe the growth of thrombus based on the local hemodynamic shear rate. The model predicts thrombus deposition based on initial geometric and fluid mechanical conditions, which are updated throughout the simulation to reflect the changing lumen dimensions...
November 12, 2016: Journal of Biomechanics
Ziad Sophie, Lekhraj Mal
The study was conducted to measure functional outcome of patients who had successful lower extremity arterial reconstruction after vascular injury at a tertiary care centre in Karachi over 5 years from January 2008 to December 2013. In this descriptive cohort study, the functional outcomes were assessed with lower extremity functional scale (LEFS). The mean age the 75 patients in the study was 32±11 years. Limb salvage was successful in 72(96%) cases. The most common injured artery was superficial femoral artery 30(40%) followed by popliteal artery 19(25%)...
October 2016: JPMA. the Journal of the Pakistan Medical Association
Yuki Honda, Kohei Wakabayashi, Takayasu Suzuki, Hiroshi Suzuki
A polytetrafluoroethylene (PTFE)-covered stent was deployed for enlarging coronary aneurysms in a 73-year-old man. Optical coherence tomography (OCT) and coronary angioscopy performed 3 months later revealed naked stent struts and thin patches of red thrombi covering the PTFE membrane even under dual antiplatelet therapy (DAPT). After 5-month warfarin administration under DAPT, OCT and angioscopy showed a clear extinction of the thin patches of red thrombi on the PTFE membrane and stent struts, although most of the struts were still naked...
November 24, 2016: Cardiovascular Intervention and Therapeutics
Stefano Fagiuoli, Raffaele Bruno, Wilma Debernardi Venon, Filippo Schepis, Francesco Vizzutti, Pierluigi Toniutto, Marco Senzolo, Paolo Caraceni, Francesco Salerno, Paolo Angeli, Roberto Cioni, Alessandro Vitale, Maurizio Grosso, Andrea De Gasperi, Gennaro D'Amico, Alfredo Marzano
The trans jugular intrahepatic Porto systemic shunt (TIPS) is no longer viewed as a salvage therapy or a bridge to liver transplantation and is currently indicated for a number of conditions related to portal hypertension with positive results in survival. Moreover, the availability of self-expandable polytetrafluoroethylene (PTFE)-covered endoprostheses has dramatically improved the long-term patency of TIPS. However, since the last updated International guidelines have been published (year 2009) new evidence have come, which have open the field to new indications and solved areas of uncertainty...
October 29, 2016: Digestive and Liver Disease
K M Heinroth, S Unverzagt, D Mahnkopf, S Frantz, R Prondzinsky
BACKGROUND: Transcoronary pacing is used for treatment of unheralded bradycardias in the setting of percutaneous coronary interventions (PCI). OBJECTIVES: In the present study we introduced a new concept - the double guidewire approach - for transcoronary pacing in a porcine model. METHODS: Transcoronary pacing was applied in 16 adult pigs under general anaesthesia in an animal catheterization laboratory. A special guidewire with electrical insulation by PTFE coating except for the distal part of the guidewire was positioned in the periphery of a coronary artery serving as the cathode...
November 23, 2016: Medizinische Klinik, Intensivmedizin und Notfallmedizin
Todd Schoenbaum, Chandur Wadhwani, Richard Stevenson
The traditional material for covering the implant abutment screw is cotton. As the implant-abutment junction flexes and wears overtime, leakage from the oral environment penetrates into the screw access chamber where the cotton pellet is located. The cotton serves as a scaffolding for the proliferation of anaerobic bacteria in the warm, oxygen free environment. The bacterial exudate causes foul odors and may cause additional inflammation of the peri-implant tissues. The use of PTFE tape or PVS impression material serves the same role as the cotton pellet, but forms a better seal and limits bacterial growth inside the implant and abutment...
November 21, 2016: Journal of Oral Implantology
Mehrdad Gholami, Shima Behkami, Sharifuddin Md Zain, Sezgin Bakirdere
The objective of this work is to prepare a cost-effective, low reagent consumption and high performance polytetrafluoroethylene (PTFE) vessel that is capable to work in domestic microwave for digesting food and environmental samples. The designed vessel has a relatively thicker wall compared to that of commercial vessels. In this design, eight vessels are placed in an acrylonitrile butadiene styrene (ABS) holder to keep them safe and stable. This vessel needs only 2.0 mL of HNO3 and 1.0 mL H2O2 to digest 100 mg of biological sample...
November 17, 2016: Scientific Reports
Nikolaos K Soldatos, Popi Stylianou, Vasiliki P Koidou, Nikola Angelov, Raymond Yukna, Georgios E Romanos
OBJECTIVE: Deficient bony ridges often complicate the implant treatment plan. Several treatment modalities are used to regenerate bone, including guided bone regeneration (GBR). The purpose of this study was to summarize the knowledge on different types of membranes available and currently used in GBR procedures in a staged approach or with simultaneous implant placement. The primary role of the membranes is to exclude epithelial and connective tissue cells from the wound area to be regenerated, and to create and maintain the space into which pluripotential and osteogenic cells are free to migrate...
November 10, 2016: Quintessence International
Faith M Akwi, Paul Watts
In this paper, a micro-fluidic optimized process for the continuous flow synthesis of azo compounds is presented. The continuous flow synthesis of Sudan II azo dye was used as a model reaction for the study. At found optimal azo coupling reaction temperature and pH an investigation of the optimum flow rates of the reactants for the diazotization and azo coupling reactions in Little Things Factory-MS microreactors was performed. A conversion of 98% was achieved in approximately 2.4 minutes and a small library of azo compounds was thus generated under these reaction conditions from couplers with aminated or hydroxylated aromatic systems...
2016: Beilstein Journal of Organic Chemistry
Jiaqing Zhang, Hexi Huang, Ruihong Ju, Kuntang Chen, Shaobin Li, Wujun Wang, Yusheng Yan
OBJECTIVE: To evaluate the biocompatibility and hemocompatibility of an enhanced polytetrafluoroethylene (ePTFE) graft modified with sulfonated silk fibroin (SF) and to compare the patency rate of the modified graft to that of the commercially available unmodified ePTFE graft in a rabbit model. METHODS: Twelve SF-modified grafts were used to replace a section of the lower abdominal aortic artery in rabbits, and 10 unmodified ePTFE grafts were used as controls. The patency rates of these grafts were examined according to physical findings, ultrasonic examination, and scanning electron microscopy (SEM)...
October 20, 2016: American Journal of Surgery
Zhiyong Wang, Kai Kang, Shibin Wang, Lin'an Li, Ningning Xu, Jiaguang Han, Mingxia He, Liang Wu, Weili Zhang
THz wave has been increasingly applied in engineering practice. One of its outstanding advantages is the penetrability through certain optically opaque materials, whose interior properties could be therefore obtained. In this report, we develop an experimental method to determine the plane stress state of optically opaque materials based on the stress-optical law using terahertz time-domain spectroscopy (THz-TDS). In this method, two polarizers are combined into the conventional THz-TDS system to sense and adjust the polarization state of THz waves and a theoretical model is established to describe the relationship between phase delay of the received THz wave and the plane stress applied on the specimen...
November 8, 2016: Scientific Reports
Qian Huang, Shubo Deng, Danna Shan, Yujue Wang, Bin Wang, Jun Huang, Gang Yu
Effective adsorption of pharmaceuticals and then degradation of them in the regeneration process are attractive for their complete removal from water or wastewater. The adsorption of diclofenac sodium (DS) on the prepared carbon nanotubes-polytetrafluorethylene (CNTs-PTFE) anode was enhanced in the presence of applied voltage. Compared with open circuit adsorption, the initial adsorption rate and adsorbed amount of DS in static adsorption experiments increased 2.1 and 1.2 times, respectively. After adsorption, the CNTs-PTFE anode was changed to cathode to in-situ degrade the adsorbed DS, and all DS was degraded after 10min using the electro-peroxone treatment...
November 2, 2016: Journal of Colloid and Interface Science
Yoichiro Ito, Xiaofeng Ma, Robert Clary
A simple tool is introduced which can modify the shape of tubing to enhance the partition efficiency in high-speed countercurrent chromatography. It consists of a pair of interlocking identical gears, each coaxially holding a pressing wheel to intermittently compress plastic tubing in 0 - 10 mm length at every 1 cm interval. The performance of the processed tubing is examined in protein separation with 1.6 mm ID PTFE tubing intermittently pressed in 3 mm and 10 mm width both at 10 mm intervals at various flow rates and revolution speeds...
2016: Current Chromatography
Dirk Dressler, Chrisanthi Karapantzou, Saskia Rohrbach, Simon Schneider, Rainer Laskawi
Blepharospasm may be accompanied by eyelid opening apraxia (EOA) reducing the efficacy of botulinum toxin (BT) therapy. The frontalis suspension operation (FSO) is then the only effective treatment option available. We want to report the first long-term results with FSO. We studied 15 patients with blepharospasm and EAO unresponsive to BT therapy (9 females, 6 males, age 61.9 ± 11.5 years). FSO was performed by applying 2 polytetrafluoroethylene threads (PTFE, Gore-Tex(®)) per eye connecting the frontalis muscle to the upper eye lid...
November 5, 2016: Journal of Neural Transmission
Dorsa Parviz, Ziniu Yu, Stanislav V Verkhoturov, Micah J Green, Ronald Carl Hedden
We describe the first preparation of polymer-supported pristine graphene thin films having dramatically different electrical conductivities on the top and bottom surfaces. Pyrene-functional stabilizers based on polystyrene or poly(methyl methacrylate) are first synthesized by co-polymerization of their monomers with 1-pyrenemethyl methacrylate. Stable dispersions of pristine graphene nanosheets are prepared by sonication of graphite in chloroform solutions of the pyrene-functional copolymers. Vacuum filtration of the polymer-stabilized graphene dispersions through a porous PTFE filter produces films having an internal gradient in nanosheet concentration...
November 1, 2016: ACS Applied Materials & Interfaces
Pouriya Esmaeilzadeh, Mohammad Taghi Sadeghi, Alireza Bahramian, Zahra Fakhroueian, Ali Zarbakhsh
Construction of surfaces with the capability of repelling both water and oil is a challenging issue. We report the superamphiphobic properties of mineral surfaces coated with nanofluids based on synthesized Co-doped and Ce-doped Barium Strontium Titanate (CoBST and CeBST) nanoparticles and fluorochemicals of trichloro(1H,1H,2H,2H-perfluorooctyl)silane (PFOS) and polytetrafluoroethylene (PTFE). Coating surfaces with these nanofluids provides both oil (with surface tensions as low as 23 mN/m) and water repellency...
November 1, 2016: ACS Applied Materials & Interfaces
Haiman Wang, Jia Liu, Weihua He, Youpeng Qu, Da Li, Qing Jiang, Yujie Feng
Most oxygen-reducing biocathodes for microbial electrochemical systems (MESs) require energy-intensive aeration of the catholyte, which negates the energy-saving benefits of MESs. To avoid aeration and enhance oxygen-utilization efficiency, columnar activated carbon with half of its surface coated by polytetrafluoroethylene (PTFE-coated CAC) was fabricated as biocathode material and its performance was investigated using a tide-type biocathode MES (TBMES). The TBMES with PTFE-coated biocathode achieved a maximum power density of 8...
October 31, 2016: ACS Applied Materials & Interfaces
Xiangju Mao, Man He, Beibei Chen, Bin Hu
By wrapping a porous membrane around the coated stir bar, a novel membrane protected stir bar sorptive extraction (MPSBSE) was proposed to filter out the high molecular weight interferences (such as humic acid), resulting in the analysis of real environmental water samples without filtration or centrifugation. Hydrophilic and hydrophobic membranes were compared and hydrophobic polytetrafluoroethylene (PTFE) membrane impregnated with methanol was employed to protect the C18 coated stir bar. The impregnated methanol improves the transfer of target analytes from sample solution to the pores and lumen of the membrane, and then to the coated stir bar inside...
October 24, 2016: Journal of Chromatography. A
Toralf Roch, Karl Kratz, Nan Ma, Andreas Lendlein
Although frequently used as implants materials, both polydimethylsiloxane (PDMS) and polytetrafluoroethylene (PTFE) are often associated with adverse effects including foreign body responses. Dendritic cells (DC) are crucial for the initiation of immune reactions and could also play a role in foreign body associated inflammations. Therefore, the interaction of DC with PDMS and PTFE was investigated regarding their capacity to induce undesired cell activation. Medical grade PDMS and PTFE films were embedded into polystyrene PS inserts via injection molding to prevent the DC from migrating below the substrate and thereby, interacting not only with the test sample but also with the culture vessel material...
October 27, 2016: Clinical Hemorheology and Microcirculation
Nicholas Djeu, Yutaka Shimoji
A novel heat-sinking, self-referencing fiber optic emission probe having a sapphire fiber probe head is described. The laser heating effect in a GaAs wafer (on a polytetrafluoroethylene (PTFE) platform) has been measured with the probe in both the noncontact proximity mode and the contact mode. The GaAs/PTFE composite was selected to simulate the thermal conductivity of animal tissues. It was found that for the same laser power delivered to the wafer, the temperature rise in the contact mode was only 42% of that in the proximity mode...
September 2016: Review of Scientific Instruments
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