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https://www.readbyqxmd.com/read/28722253/late-lumen-enlargement-induced-by-drug-coated-balloon-in-the-patient-with-ptfe-covered-stent-restenosis
#1
Takayuki Warisawa, Toru Naganuma, Sunao Nakamura
We report a case of percutaneous coronary intervention with drug coated balloon (DCB) for the in-stent restenosis of polytetrafluoroethylene-covered stent. One year follow-up angiography was excellent and in-stent lumen enlargement compared with the postprocedure and 6-months follow-up was demonstrated by optical coherent tomography. This case suggested the utility of DCB as a therapeutic option for covered-stent restenosis.
July 19, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28721617/effect-of-membrane-property-and-feed-water-organic-matter-quality-on-long-term-performance-of-the-gravity-driven-membrane-filtration-process
#2
Dongwhi Lee, Yuri Lee, Shin Sik Choi, Sang-Ho Lee, Kyoung-Woong Kim, Yunho Lee
This study investigated the influence of membrane property and feed water organic matter quality on the permeate flux and water quality during gravity-driven membrane (GDM) filtration. GDM filtration was continuously carried out over 500 days at hydrostatic pressure of 65 mbar in dead-end mode without any back-flushing or membrane cleaning. Three ultrafiltration (UF) membranes (PES-100 kDa, PVDF-120 kDa, and PVDF-100 kDa) and one microfiltration (MF) membrane (PTFE-0.3 μm) were tested for treating lake water with varied organic matter qualities due to algal growth...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28719863/evaluation-of-platelet-adhesion-and-activation-on-polymers-round-robin-study-to-assess-inter-center-variability
#3
S Braune, C Sperling, M F Maitz, U Steinseifer, J Clauser, B Hiebl, S Krajewski, H P Wendel, F Jung
The regulatory agencies provide recommendations rather than protocols or standard operation procedures for the hemocompatibility evaluation of novel materials e.g. for cardiovascular applications. Thus, there is a lack of specifications with regard to test setups and procedures. As a consequence, laboratories worldwide perform in vitro assays under substantially different test conditions, so that inter-laboratory and inter-study comparisons are impossible. Here, we report about a prospective, randomized and double-blind multicenter trial which demonstrates that standardization of in vitro test protocols allows a reproducible assessment of platelet adhesion and activation from fresh human platelet rich plasma as possible indicators of the thrombogenicity of cardiovascular implants...
July 3, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28712961/disruption-in-non-anastomotic-section-of-an-axillofemoral-bypass-a-thorough-critical-review-of-the-literature
#4
REVIEW
S Valverde García, R Peña Cortés, J Torre Eiriz, M B García-Cenador, F S Lozano Sánchez
This work is a thorough non-systematic critical review (PubMed/Medline 1950-september 2016) of "disruption in non-anastomotic section of an axillofemoral bypass". Fourteen cases were selected (including that provided by the authors of this publication) dating from 1963 to 2016 (53 years). This type of disruption is a very unusual complication in axillofemoral bypass. The cases described reveal that this disorder is more frequent in unifemoral bypass (9 cases), in ringed PTFE (10), in blunt trauma (8) and at costal level (12) especially on the left side (8)...
July 13, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28707896/smart-floor-with-integrated-triboelectric-nanogenerator-as-energy-harvester-and-motion-sensor
#5
Chuan He, Weijun Zhu, Baodong Chen, Liang Xu, Tao Jiang, Chang Bao Han, Guang Qin Gu, Dichen Li, Zhong Lin Wang
A smart floor is demonstrated by integrating a square-frame triboelectric nanogenerator (SF-TENG) into a standard wood floor. The smart floor has two working modes based on two pairs of triboelectric materials: one is purposely chosen polytetrafluoroethylene (PTFE) films and aluminum (Al) balls, the other is the floor itself and the objects that can be triboelectrically charged, such as basketball, shoe soles, and scotch tape, etc. Utilizing the Al balls enclosed inside shallow boxes, the smart floor is capable of harvesting vibrational energy, hence provides a non-intrusive way to detect the sudden fall of the elderly...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28702969/bi-layered-collagen-nano-structured-membrane-prototype-collagen-matrix-10826%C3%A2-for-soft-tissue-regeneration-in-rabbits-an-in-vivo-ultra-structural-study-of-the-early-healing-phase
#6
D De Santis, G B Menchini Fabris, J Lotti, C Palumbo, M Ferretti, R Castellani, T Lotti, G Zanotti, F Gelpi, C Covani, P F Nocini
Collagen Matrix (CM) 10826 is a nanostructured bi-layered collagen membrane obtained from type I and III porcine collagen, which in vitro has shown to have the potential to be a substitute and/or stimulant for soft oral tissue regeneration. The objective of this study was to evaluate the in vivo potential and safety of this membrane for soft tissue regeneration in the early stage of wound healing. Two soft tissue wounds (test and control) were created on the back skin of 5 rabbits (female New Zealand White Rabbits specific pathogen free)...
July 13, 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28702885/use-of-a-super-hydrophobic-microbioreactor-to-generate-and-boost-pancreatic-mini-organoids
#7
Tiziana A L Brevini, Elena F M Manzoni, Sergio Ledda, Fulvio Gandolfi
Cell remarkable ability to self-organize and rearrange in functional organoids has been greatly boosted by the recent advances in 3-D culture technologies and materials. This approach can be presently applied to model human organ development and function "in a dish" and to predict drug response in a patient specific fashion.Here we describe a protocol that allows for the derivation of functional pancreatic mini-organoids from skin biopsies. Cells are suspended in a drop of medium and encapsulated with hydrophobic polytetrafluoroethylene (PTFE) powder particles, to form microbioreactors defined as "Liquid Marbles," that stimulate cell coalescence and 3-D aggregation...
July 13, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28697012/comparison-of-direct-site-endovascular-repair-utilizing-expandable-ptfe-stent-grafts-vs-standard-vascular-shunts-in-a-porcine-sus-scrofa-model
#8
Anders J Davidson, Lucas P Neff, J Kevin Grayson, Nathan F Clement, Erik S DeSoucy, Meryl A Simon-Logan, Christopher M Abbot, James B Sampson, Timothy K Williams
INTRODUCTION: The small diameter of temporary vascular shunts for vascular trauma management may restrict flow and result in ischemia or early thrombosis. We have previously reported a clinical experience with direct, open surgical reconstruction using expanded polytetrafluoroethylene (ePTFE) stent grafts to create a "sutureless" anastomosis as an alternative to standard temporary vascular shunts. We sought to characterize patency and flow characteristics of these grafts compared to standard shunts in a survival model of porcine vascular injury...
July 8, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28672142/how-effective-is-the-tent-screw-pole-technique-compared-to-other-forms-of-horizontal-ridge-augmentation
#9
George R Deeb, Dan Tran, Caroline K Carrico, Erin Block, Daniel M Laskin, Janina Golob Deeb
PURPOSE: The tent screw pole technique is one of the methods available for practitioners to perform horizontal ridge augmentation to facilitate dental implant placement. The purpose of this study was to evaluate the efficacy of the tent screw pole technique for horizontal ridge augmentation and to compare the results with those of the tunnel technique and open ridge augmentation. PATIENTS AND METHODS: In this retrospective cohort study, 35 patients underwent horizontal ridge augmentation with the tent screw pole technique, a 1:1 ratio of mineralized freeze-dried bone allograft and particulate bovine hydroxyapatite, and a resorbable collagen membrane...
June 13, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28662400/linker-free-covalent-immobilization-of-heparin-sdf-1%C3%AE-and-cd47-on-ptfe-surface-for-antithrombogenicity-endothelialization-and-anti-inflammation
#10
Ang Gao, Ruiqiang Hang, Wan Li, Wei Zhang, Penghui Li, Guomin Wang, Long Bai, Xue-Feng Yu, Huaiyu Wang, Liping Tong, Paul K Chu
Small-diameter vascular grafts made of biomedical polytetrafluoroethylene (PTFE) suffer from the poor long-term patency rate originating from thrombosis and intimal hyperplasia, which can be ascribed to the insufficient endothelialization and chronic inflammation of the materials. Hence, bio-functionalization of PTFE grafts is highly desirable to circumvent these disadvantages. In this study, a versatile "implantation-incubation" approach in which the biomedical PTFE is initially modified by plasma immersion ion implantation (PIII) is described...
June 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/28658580/toward-a-long-chain-perfluoroalkyl-replacement-water-and-oil-repellency-of-polyethylene-terephthalate-pet-films-modified-with-perfluoropolyether-based-polyesters
#11
Tugba Demir, Liying Wei, Naoki Nitta, Gleb Yushin, Philip J Brown, Igor Luzinov
Original perfluoropolyethers (PFPE)-based oligomeric polyesters (FOPs) of different macromolecular architecture were synthesized via polycondensation as low surface energy additives to engineering thermoplastics. The oligomers do not contain long-chain perfluoroalkyl segments, which are known to yield environmentally unsafe perfluoroalkyl carboxylic acids. To improve the compatibility of the materials with polyethylene terephthalate (PET) we introduced isophthalate segments into the polyesters and targeted the synthesis of lower molecular weight oligomeric macromolecules...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28657292/plasma-functionalized-polytetrafluoroethylene-nanoparticles-for-improved-wear-in-lubricated-contact
#12
Vinay Sharma, Richard Timmons, Ali Erdemir, Pranesh B Aswath
Plasma-functionalized polytetrafluoroethylene (PTFE) nanoparticles were employed to evaluate their utility in improving the lubrication property of a group III mineral oil with a significantly low amount of zinc dialkyl dithiophosphate (ZDDP). The particles were coated with two consecutive films; the initial coating contained silica to enhance amorphous glassy tribofilm formation, followed by a methacrylate film to protect the silica coating and enhance dispersibility in the oil. The functionalized nanoparticles were evaluated for their tribological performance using a high-frequency reciprocating rig, in a cylinder-on-flat configuration...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28655388/ultrasound-guided-percutaneous-endovascular-treatment-of-arteriovenous-fistula-graft
#13
Boštjan Leskovar, Tjaša Furlan, Simona Poznič, Maja Potisek, Anton Adamlje, Tomaž Ključevšek
BACKGROUND: Ultrasound-guided percutaneous endovascular treatment of arteriovenous fistula (AVF) or graft failure is an alternative to radiologically-guided angioplastic methods. Its main advantages are that it can be used with open or percutaneous access, using no contrast media and no radiation. The aim of this study was to analyze the results of ultrasound-guided endovascular treatment of arteriovenous access failure. MATERIAL AND METHODS: Preoperative ultrasound was used to determine the degree of stenosis and the size of balloon used in angioplasty...
June 28, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28648794/in%C3%A2-vitro-and-in%C3%A2-vivo-evaluation-of-a-small-caliber-coaxial-electrospun-vascular-graft-loaded-with-heparin-and-vegf
#14
Yun-Tao Hu, Xu-Dong Pan, Jun Zheng, Wei-Guo Ma, Li-Zhong Sun
INTRODUCTION: To date, clinically available expanded polytetrafluoro-ethylene (ePTFE) vascular grafts are suboptimal for reconstructing small caliber (D < 6 mm) arteries, owing to thrombosis in early and restenosis in late stage. Our aim in this preliminary study was to fabricate a nano-fibrous vascular graft which was biofunctionalized with VEGF165 and heparin. The short term performance was evaluated both in vitro and in vivo. METHOD: Four-mm caliber grafts were prepared by the coaxial-elctrospun technique, which consisted of poly(l-lactide-co-caprolactone) [P(LLA-CL)] collagen and elastin...
June 22, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28647637/transcervical-carotid-artery-stenting-using-a-prosthetic-arterial-conduit-case-series-of-a-novel-surgical-technique
#15
Nandakumar Menon, Ali Khalifeh, Charles B Drucker, Sunny Sahajwani, Danon Garrido, Richa Kalsi, Brajesh K Lal, Shahab Toursavadkohi
We present a series of 4 patients with carotid restenosis following carotid endarterectomy (CEA) who underwent transcervical carotid artery stenting (CAS) using a novel prosthetic conduit technique. The patients were high risk for repeat CEA (short and obese necks) and had contraindications to transfemoral CAS (Bovine arch, prior dissection). Carotid artery stenting was thus performed via a transcervical approach with a polytetrafluoroethylene (PTFE) conduit anastomosed to the proximal common carotid artery (CCA)...
June 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28647632/axillary-artery-to-right-atrial-graft-for-dialysis-access-using-an-autologous-femoropopliteal-vein
#16
Yusuf Chauhan, M Mujeeb Zubair, Sashi Inkollu, Eric K Peden
Patients with prolonged history of central venous catheters can develop central venous occlusion. We report the creation of an axillary artery to right atrial graft using the femoropopliteal vein for dialysis access in a patient with end stage renal disease (ESRD) on hemodialysis with history of central venous occlusion. The patient had previously developed steal syndrome following a right brachial artery to right atrial polytetrafluoroethylene (PTFE) graft requiring revision to a left axillary artery inflow which subsequently thrombosed...
June 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28647631/a-prospective-randomized-multicenter-clinical-trial-on-the-safety-and-efficacy-of-a-ready-to-use-fibrin-sealant-as-an-adjunct-to-hemostasis-during-vascular-surgery
#17
Ian Chetter, Gerard Stansby, José Aurelio Sarralde, Vicente Riambau, Antonio Giménez-Gaibar, Kent MacKenzie, Francisco Acín, Jordi Navarro-Puerto
PURPOSE: Anastomotic or "stitch hole" bleeding is common during vascular surgery with synthetic material such as Dacron or polytetrafluoroethylene (PTFE). Hemostatic adjuncts such as fibrin sealant (FS) may reduce blood loss and operating time in such circumstances. We evaluated the safety and the hemostatic effectiveness of a ready-to-use human plasma-derived FS in vascular surgery. METHODS: Patients with mild / moderate suture line bleeding during elective, open, vascular surgery using synthetic grafts or patches were studied...
June 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28633677/surveillance-of-endoscopes-comparison-of-different-sampling-techniques
#18
Lien Cattoir, Thomas Vanzieleghem, Lisa Florin, Tania Helleputte, Martine De Vos, Bruno Verhasselt, Jerina Boelens, Isabel Leroux-Roels
OBJECTIVE To compare different techniques of endoscope sampling to assess residual bacterial contamination. DESIGN Diagnostic study. SETTING The endoscopy unit of an 1,100-bed university hospital performing ~13,000 endoscopic procedures annually. METHODS In total, 4 sampling techniques, combining flushing fluid with or without a commercial endoscope brush, were compared in an endoscope model. Based on these results, sterile physiological saline flushing with or without PULL THRU brush was selected for evaluation on 40 flexible endoscopes by adenosine triphosphate (ATP) measurement and bacterial culture...
June 21, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28609786/gravimetric-measurements-of-filtering-facepiece-respirators-challenged-with-diesel-exhaust
#19
Swathi Satish, Jacob J Swanson, Kai Xiao, Andrew S Viner, David B Kittelson, David Y H Pui
Elevated concentrations of diesel exhaust have been linked to adverse health effects. Filtering facepiece respirators (FFRs) are widely used as a form of respiratory protection against diesel particulate matter (DPM) in occupational settings. Previous results (Penconek A, Drążyk P, Moskal A. (2013) Penetration of diesel exhaust particles through commercially available dust half masks. Ann Occup Hyg; 57: 360-73.) have suggested that common FFRs are less efficient than would be expected for this purpose based on their certification approvals...
June 13, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28601403/-activity-of-amphotericin-b-and-anidulafungin-alone-and-combined-against-candida-tropicalis-biofilms-developed-on-teflon-%C3%A2-and-titanium
#20
Marcelo Ernesto Fernández-Rivero, José L Del Pozo, Amparo Valentín, Victoria Fornes, Araceli Molina de Diego, Javier Pemán, Emilia Cantón
BACKGROUND: Current therapeutic strategies have a limited efficacy against Candida biofilms that form on the surfaces of biomedical devices. Few studies have evaluated the activity of antifungal agents against Candida tropicalis biofilms. OBJECTIVES: To evaluate the activity of amphotericin B (AMB) and anidulafungin (AND), alone and in combination, against C. tropicalis biofilms developed on polytetrafluoroethylene (teflon -PTFE) and titanium surfaces using time-kill assays...
June 14, 2017: Revista Iberoamericana de Micología
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