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https://www.readbyqxmd.com/read/28228875/traumatic-nonanastomotic-axilloprofundal-ptfe-bypass-rupture-a-case-report
#1
Borna K Barth, Fabian Hässler, Oliver Graubitz
A 76-year-old male patient was admitted to our emergency department with painful swelling of the right lateral chest after a fall. Imaging revealed a hematoma, secondary to rupture of a synthetic axilloprofundal bypass. In an emergency surgical procedure, the spelled hematoma was evacuated and the graft legs were successfully ligated. The patient was discharged after an uneventful hospital stay. Traumatic bypass rupture because of blunt trauma is an exceedingly rare event; however, it must be taken into consideration in a patient with bypass surgery in his/her history...
March 2017: Radiology case reports
https://www.readbyqxmd.com/read/28226294/extruded-dielectric-sample-tubes-of-complex-cross-section-for-epr-signal-enhancement-of-aqueous-samples
#2
Jason W Sidabras, Richard R Mett, James S Hyde
This paper builds on the work of Mett and Hyde (2003) and Sidabras et al. (2005) where multiple flat aqueous sample cells placed perpendicular to electric fields in microwave cavities were used to reduce the RF losses and increase the EPR signal. In this work, we present three novel sample holders for loop-gap resonators (LGRs) and cylindrical cavity geometries. Two sample holders have been commissioned and built by polytetrafluoroethylene (PTFE) extrusion techniques: a 1mm O.D. capillary with a septum down the middle, named DoubleDee, and a 3...
February 14, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28224036/clinical-results-of-biologic-prosthesis-a-systematic-review-and-meta-analysis-of-comparative-studies
#3
REVIEW
Chumpon Wilasrusmee, Boonying Siribumrungwong, Suthas Horsirimanont, Napaphat Poprom, Jakrapan Jirasiritham, Ammarin Thakkinstian
BACKGROUND: Biologic prosthesis (BP) has been reported as a safe alternative to polytetrafluoroethylene (PTFE) in vascular reconstruction. However, efficacy of BP remains controversial. We, therefore, conducted a systematic review to summarize previous available evidences comparing the BP and PTFE in terms of clinical outcomes. MATERIALS AND METHODS: A literature search of the MEDLINE and Scopus was performed to identify comparative studies reporting outcomes of BP, PTFE, and/or autologous veins graft (VG) in vascular access for hemodialysis or femoropopliteal bypass...
March 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28218503/long-term-tissue-culture-of-adult-brain-and-spleen-slices-on-nanostructured-scaffolds
#4
Sonja Kallendrusch, Felicitas Merz, Ingo Bechmann, Stefan G Mayr, Mareike Zink
Long-term tissue culture of adult mammalian organs is a highly promising approach to bridge the gap between single cell cultures and animal experiments, and bears the potential to reduce in vivo studies. Novel biomimetic materials open up new possibilities to maintain the complex tissue structure in vitro; however, survival times of adult tissues ex vivo are still limited to a few days with established state-of-the-art techniques. Here, it is demonstrated that TiO2 nanotube scaffolds with specific tissue-tailored characteristics can serve as superior substrates for long-term adult brain and spleen tissue culture...
February 20, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28205013/utilizing-the-foreign-body-response-to-grow-tissue-engineered-blood-vessels-in-vivo
#5
Wouter J Geelhoed, Lorenzo Moroni, Joris I Rotmans
It is well known that the number of patients requiring a vascular grafts for use as vessel replacement in cardiovascular diseases, or as vascular access site for hemodialysis is ever increasing. The development of tissue engineered blood vessels (TEBV's) is a promising method to meet this increasing demand vascular grafts, without having to rely on poorly performing synthetic options such as polytetrafluoroethylene (PTFE) or Dacron. The generation of in vivo TEBV's involves utilizing the host reaction to an implanted biomaterial for the generation of completely autologous tissues...
February 15, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28196172/alveolar-ridge-preservation-with-nc-ha-and-d-ptfe-membrane-a-clinical-histologic-and-histomorphometric-study
#6
Domenica Laurito, Marco Lollobrigida, Francesca Gianno, Sandro Bosco, Luca Lamazza, Alberto De Biase
Alveolar ridge preservation has become a very common procedure following tooth extraction. This study presents a clinical, histologic, and histomorphometric analysis of postextraction bone changes using nanocrystalline hydroxyapatite (nc-HA) and exposed high-density polytetrafluoroethylene (d-PTFE) membrane. A total of 10 extraction sockets were treated. Clinical measurements were taken after tooth extraction with a customized acrylic stent to ensure the same measurement points. At 6 months, clinical measurements were repeated and bone specimens taken...
March 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28195496/high-pressure-high-temperature-hp-ht-stability-of-polytetrafluoroethylene-raman-spectroscopic-study-up-to-10%C3%A2-gpa-and-600%C3%A2-%C3%A2
#7
Anna Yu Likhacheva, Artem D Chanyshev, Sergey V Goryainov, Sergey V Rashchenko, Konstantin D Litasov
The increasing demand for use of polymers at extreme conditions makes important the exploration of their behavior in a wide pressure and temperature range, which remains unknown for polytetrafluoroethylene (PTFE), one of the most common materials. An in situ Raman spectroscopic study of PTFE shows that it is stable within the range of 2-6 GPa at 500 ℃ and up to 12 GPa at 400 ℃. At T > 500 ℃ and P > 3.5 GPa, the graphitization of PTFE is observed, but judging from the preservation of liquid run products, PTFE can be used as a material for sample container up to 600 ℃ at this pressure...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28193359/preparation-of-organic-monolithic-columns-in-polytetrafluoroethylene-tubes-for-reversed-phase-liquid-chromatography
#8
M Catalá-Icardo, S Torres-Cartas, S Meseguer-Lloret, C Gómez-Benito, E Carrasco-Correa, E F Simó-Alfonso, G Ramis-Ramos, J M Herrero-Martínez
In this work, a method for the preparation and anchoring of polymeric monoliths in a polytetrafluoroethylene (PTFE) tubing as a column housing for microbore HPLC is described. In order to assure a covalent attachment of the monolith to the inner wall of the PTFE tube, a two-step procedure was developed. Two surface etching reagents, a commercial sodium naphthalene solution (Fluoroetch(®)), or mixtures of H2O2 and H2SO4, were tried and compared. Then, the obtained hydroxyl groups on the PTFE surface were modified by methacryloylation...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28184055/clinical-applications-of-polytetrafluoroethylene-ptfe-tape-in-restorative-dentistry
#9
M M Sattar, M Patel, A Alani
Restorative dental procedures are ever developing; one reason for this can be attributed to newer materials with better handling properties and our ability to manipulate them more effectively. As a result various techniques have been described to aid clinicians in obtaining predictable results in restorative dental procedures. This article aims to review the use of plumber's tape to assist in adhesive, endodontic and implant related dental procedures, when compared to other available materials.
February 10, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28183180/regulation-mechanism-of-salt-ions-for-superlubricity-of-hydrophilic-polymer-cross-linked-networks-on-ti6al4v
#10
Caixia Zhang, Yuhong Liu, Zhifeng Liu, Hongyu Zhang, Qiang Cheng, Congbin Yang
Poly (vinylphosphonic acid)(PVPA) cross-linked networks on Ti6Al4V show superlubricity behavior when sliding against polytetrafluoroethylene (PTFE) in water-based lubricants. The superlubricity can occur, but only with the existence of salt ions in the polymer cross-linked networks. This is different from the phenomenon in most polymer brushes. An investigation into the mechanism revealed that cations and anions in the lubricants worked together to yield the superlubricity even in harsh conditions. It is proposed that the preferential interactions of cations with PVPA molecules rather than water molecules are the main reason for the superlubricity in water-based lubricants...
February 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28181605/synthesis-of-silicon-carbide-nanocrystals-from-waste-polytetrafluoroethylene
#11
Liangbiao Wang, Qinglin Cheng, Hengfei Qin, Zhongchun Li, Zhengsong Lou, Juanjuan Lu, Junhao Zhang, Quanfa Zhou
Resource utilization of waste plastic could solve the problem of environmental pollution and simultaneously relieve energy shortages, achieving sustainable development. In this study, the conversion of waste polytetrafluoroethylene (PTFE) to cubic silicon carbide (SiC) nanoparticles has been described. The structures and morphologies of the obtained SiC were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Furthermore, the FTIR spectrum of the obtained SiC sample suggests that the waste PTFE was completely converted into SiC in our approach...
February 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28177297/enhanced-performance-of-zno-microballoon-arrays-for-triboelectric-nanogenerator
#12
Weili Deng, Binbin Zhang, Long Jin, Yueqi Chen, Wenjun Chu, Haitao Zhang, Minhao Zhu, Weiqing Yang
In recent years, triboelectric nanogenerator (TENG), harvesting energy from the environment as sustainable power source as a kind of new technology, has attracted great attention. Presently, many reports focused on the effect of the surface modification on the performance of electrical output of TENG. In this work, we have fabricated a vertically-grown ZnO microballoon (ZnOMB) arrays on top of pyramid-featured PDMS patterned film, contacted with the PTFE film to construct TENG. The electrical output performances of the designed TENG were presented under the external forces with different frequencies...
February 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28165572/early-cannulation-graft-flixene%C3%A2-for-conventional-and-complex-hemodialysis-access-creation
#13
Carlos A Hinojosa, Saul Soto-Solis, Sandra Olivares-Cruz, Hugo Laparra-Escareno, Zeniff Gomez-Arcive, Javier E Anaya-Ayala
PURPOSE: The Flixene™ (Atrium™, Hudson, NH) is a trilaminate composite polytetrafluoroethylene (PTFE) graft that allows access within 72 hours. We evaluate our initial experience with this device for conventional and complex hemodialysis access creation. METHODS: Retrospective review in end-stage renal disease (ESRD) patients who underwent access creation with Flixene from January 2013 to July 2014. For our analysis, the patients were divided in two groups: those with complex access configurations tunneled in the chest and/or abdominal wall (thoraco-abdominal wall access [TAWA]), and those tunneled in conventional sites (extremity access [EA])...
February 6, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/28164206/influence-of-fluid-viscosity-and-wetting-on-multiscale-viscoelastic-lubrication-in-soft-tribological-contacts
#14
Nichola Selway, Vincent Chan, Jason R Stokes
Friction (and lubrication) between soft contacts is prevalent in many natural and engineered systems and plays a crucial role in determining their functionality. The contribution of viscoelastic hysteresis losses to friction in these systems has been well-established and defined for dry contacts; however, the influence of fluid viscosity and wetting on these components of friction has largely been overlooked. We provide systematic experimental evidence of the influence of lubricant viscosity and wetting on lubrication across multiple regimes within a viscoelastic contact...
February 6, 2017: Soft Matter
https://www.readbyqxmd.com/read/28163179/biomimetic-heparan-sulfate-like-coated-eptfe-grafts-reduce-in-graft-neointimal-hyperplasia-in-ovine-carotids
#15
Birgit Wulff, Stefan Stahlhoff, Reinhard Vonthein, Andreas Schmidt, Matthias Sigler, Giovanni B Torsello, Monika Herten
BACKGROUND: Thrombogenicity and neointimal hyperplasia are major causes for synthetic vascular graft failure. Bioactive coatings like heparin have improved patency by reducing thrombogenicity, but neointimal hyperplasia still remains an unsolved problem. Surface coatings with heparan sulfate (HS), the major component of the glycocalyx of endothelial cells, have shown reduced platelet and cell adhesion in vitro. The aim of the study was to evaluate the in vivo surface properties of expanded ePTFE vascular grafts with a semisynthetic HS-like coating (SSHS)...
February 3, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28163037/laparoscopic-repair-of-an-intrapericardial-diaphragmatic-hernia-after-convergent-maze-procedure
#16
Andrew J Kaufman, Eugene T Kahn, Jonathan Villena-Vargas, Justin G Steele, Raja M Flores
The convergent maze procedure (CMP) is a new minimally invasive technique for the surgical treatment of atrial fibrillation (AF). Recently, multiple groups have published excellent results and few adverse events with CMP. However we now report the second case of an intrapericardial diaphragmatic hernia with small-bowel obstruction that resulted from CMP. This complication was managed successfully by laparoscopic repair of the hernia utilizing a PTFE mesh closure with hepatic buttress achieving an excellent result...
February 2, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28157689/differential-mineralization-of-human-dental-pulp-stem-cells-on-diverse-polymers
#17
Christian Apel, Patricia Buttler, Jochen Salber, Anandhan Dhanasingh, Sabine Neuss
In tissue engineering, biomaterials are used as scaffolds for spatial distribution of specific cell types. Biomaterials can potentially influence cell proliferation and extracellular matrix formation, both in positive and negative ways. The aim of the present study was to investigate and compare mineralized matrix production of human dental pulp stem cells (DPSC), cultured on 17 different well-characterized polymers. Osteogenic differentiation of DPSC was induced for 21 days on biomaterials using dexamethasone, L-ascorbic-acid-2-phosphate, and sodium β-glycerophosphate...
February 3, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28145616/bailout-polytetrafluoroethylene-covered-stent-implantation-for-left-main-bifurcation-perforation-using-the-kissing-stent-technique
#18
Noriaki Moriyama, Yutaka Tanaka, Shigeru Saito
Coronary artery perforation during percutaneous coronary intervention is a rare, but potentially lethal complication. Immediate balloon expansion at the perforation site can halt the bleeding. Implantation of a coronary polytetrafluoroethylene (PTFE)-covered stent enables the efficient endovascular repair of a coronary artery perforation. However, if the perforation occurs at a bifurcation, a PTFE-covered stent may jail the side branch. We report a difficult case of blowout coronary perforation (Ellis type III) at a left main coronary artery bifurcation, which was successfully sealed with a PTFE-covered stent without interference with the side branch coronary artery circulation...
February 1, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28121521/transjugular-intrahepatic-portosystemic-shunts-in-patients-with-cirrhosis-with-refractory-ascites-comparison-of-clinical-outcomes-by-using-8-and-10-mm-ptfe-covered-stents
#19
Roberto Miraglia, Luigi Maruzzelli, Fabio Tuzzolino, Ioannis Petridis, Mario D'Amico, Angelo Luca
Purpose To compare the efficacy and complications of transjugular intrahepatic portosystemic shunt (TIPS) creation performed by using a 10-mm or an 8-mm-diameter polytetrafluoroethylene (PTFE)-covered stent in a consecutive series of patients with cirrhosis with refractory ascites (RA). Materials and Methods The institutional review board approved this retrospective study and informed consent was waived. One hundred seventy-one patients with RA (mean age, 58.7 years ± 10.3; 95% confidence interval [CI]: 57...
January 25, 2017: Radiology
https://www.readbyqxmd.com/read/28111384/dental-materials-and-their-performance-for-the-management-of-screw-access-channels-in-implant-supported-restorations
#20
Philipp Raab, Christos Alamanos, Sebastian Hahnel, Dimitrios Papavasileiou, Michael Behr, Martin Rosentritt
Unsuccessfully sealed screw access channels of prosthetic implant abutments may lead to malodor or peri-implant diseases in gingival tissues adjacent to implant-supported restorations. Therefore, 72 sets of screw channel analogs with six different materials incorporated (Polytetrafluoroethylene (PTFE), wax, gutta-percha, cavit, endofrost-pellets and cotton pellets) were exposed (2.5 h, 37°C) to Streptococcus mutans, oralis and Candida albicans suspensions. Bacterial adherence was quantified by using the fluorescence dye, Alamar Blue/resazurin, and an automated multifunctional reader...
January 20, 2017: Dental Materials Journal
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