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https://www.readbyqxmd.com/read/29146831/stent-assisted-coiling-of-cerebral-aneurysms-a-single-center-clinical-and-angiographic-analysis
#1
Jun Wang, Jan Vargas, Alejandro Spiotta, Imran Chaudry, Raymond D Turner, Jonathan Lena, Aquilla Turk
OBJECTIVE: This study retrospectively compared the clinical and angiographic outcomes of treating cerebral aneurysms with Neuroform (NEU), Enterprise (EP), and Low-profile Visualized Intraluminal Support (LVIS/LVIS Jr) stents. MATERIALS AND METHODS: We conducted a retrospective analysis of a procedural database. All aneurysm procedures using any of the three types of self-expanding nitinol stents (NEU, EP and LVIS/LVIS Jr) were included. Intra-procedure complications, post-procedure complications, and angiographic results (Raymond-Roy grade scale, RRGS) were analyzed retrospectively...
November 16, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29136621/evaluation-of-nickel-release-from-endobronchial-valves-as-a-possible-cause-of-hypersensitivity-pneumonitis-in-a-patient-treated-with-bronchoscopic-lung-volume-reduction
#2
Daniel P Franzen, Claudia Lang, Nikos Agorastos, Lutz Freitag, Malcolm Kohler, Peter Schmid-Grendelmeier
BACKGROUND: Endobronchial valve (EBV) placement is an established lung volume reduction procedure aiming to improve lung function and exercise capacity in patients with severe emphysema. As EBVs consist of silicone and nitinol (a metal alloy of nickel and titanium), there are concerns that nickel ions might be released and could have a clinical impact in patients with a contact allergy to nickel. Based on a case with hypersensitivity pneumonitis (HP) after treatment with EBVs, we aimed to evaluate the in vitro nickel release from EBVs using inductively coupled plasma mass spectrometry (ICP-MS) and scanning electron microscopy (SEM)...
November 15, 2017: International Archives of Allergy and Immunology
https://www.readbyqxmd.com/read/29136578/deformation-mechanisms-of-prototype-composite-braided-stent-grafts-in-bending-fatigue-for-peripheral-artery-application
#3
Wen Xue, Jing Gao, Jing Lin, Fujun Wang, Guoping Guan, Lu Wang
Stent-grafts in peripheral arteries suffer from complex cyclic loadings in vivo, including pulsatile, axial bending and torsion. Normal fatigue durability evaluation technologies, however, are majorly based on pulsation and thus are short of accuracy under the complicated stress conditions experienced physiologically. While there is a little research focused on the cyclic fatigue of stent-grafts in bending, it remains an almost total lack of deformation or fatigue mechanisms. In this work, composite braided stent-grafts incorporating Nitinol (NiTi) yarns and polyethylene terephthalate (PET) multifilament yarns were cycled in bending by the self-developed testing system to investigate their deformation behaviors...
October 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29126167/outcome-of-long-term-complications-after-permanent-metallic-left-bronchial-stenting-in-children
#4
Paola Serio, Raffaella Nenna, Marco Di Maurizio, Stefano Avenali, Roberto Leone, Roberto Baggi, Luigi Arcieri, Bruno Murzi, Andrea Quarti, Marco Pozzi, Lorenzo Mirabile, Fabio Midulla
OBJECTIVES: We describe the way we treated 7 children with critical long-term complications after metallic balloon-expandable stenting in the left mainstem bronchus. METHODS: Endoscopic follow-up included a first bronchoscopy 3 weeks after stenting, then monthly for 3 months, every 4-6 months up to 1 year and at scheduled times to calibrate stent diameter up to final calibration. When major complications occurred, patients underwent chest computed tomographic angiography...
November 8, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29124119/endoscopic-ultrasound-guided-gallbladder-drainage-for-acute-cholecystitis-with-a-silicone-covered-nitinol-short-bilaterally-flared-stent-a-case-series
#5
Raffaele Manta, Claudio Zulli, Angelo Zullo, Edoardo Forti, Alberto Tringali, Lorenzo Dioscoridi, Francesco Zito, Helga Bertani, Rita Conigliaro, Massimiliano Mutignani
Background and study aim: Gallbladder drainage in patients with cholecystitis who are unsuitable for surgery may be performed by endoscopic ultrasound (EUS)-guided placement of specifically designed fully covered metal stents. We describe the first case series of patients treated with a silicone-covered nitinol stent with bilateral anchor flanges. Patients and methods: Data from consecutive patients with acute cholecystitis who were deemed unsuitable candidates for surgery were collected...
November 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29102689/early-experience-with-new-transcatheter-mitral-valve-replacement
#6
Vinayak Bapat, Vivek Rajagopal, Christopher Meduri, R Saeid Farivar, Antony Walton, Stephen J Duffy, Robert Gooley, Aubrey Almeida, Michael J Reardon, Neal S Kleiman, Konstantinos Spargias, Stratis Pattakos, Martin K Ng, Michael Wilson, David H Adams, Martin Leon, Michael J Mack, Sharla Chenoweth, Paul Sorajja
BACKGROUND: Transcatheter mitral valve replacement (TMVR) is a potential therapy for patients with symptomatic, severe mitral regurgitation (MR). The feasibility of this therapy remains to be defined. OBJECTIVE: We report our early experience with TMVR using a new valve system. METHODS: The valve is a self-expanding, nitinol valve with bovine pericardial leaflets that is placed using a transapical delivery system. Patients with symptomatic MR who were deemed high or extreme risk by the local heart teams were enrolled in a global pilot study at 14 sites (U...
October 25, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29101815/a-ptx-nitinol-stent-combination-with-temperature-responsive-phase-change-1-hexadecanol-for-magnetocaloric-drug-delivery-magnetocaloric-drug-release-and-esophagus-tissue-penetration
#7
Zhu Jin, Keqin Wu, Jingwen Hou, Kunhong Yu, Yuanyuan Shen, Shengrong Guo
An antitumor drug/esophagus stent combination can palliatively relieve malignant esophageal stricture and exert local chemotherapy to cancer. It is vital for effective treatment of cancer to control drug release and facilitate drug penetration into deep tissue after the combination is placed in the malignant strictured esophagus part. In this study, we firstly designed and prepared a novel antitumor drug/esophagus stent combination: a magnetocaloric nitinol stent coated with a bilayered film that consisted of one ethylene-vinyl acetate copolymer (EVA) layer as drug blocking layer and one EVA layer containing 10% paclitaxel (PTX) and 30% temperature sensitive phase-change fatty alcohol (1-tetradecanol, 1-hexadecanol or 1-octadecanol)...
October 27, 2017: Biomaterials
https://www.readbyqxmd.com/read/29095508/laser-assisted-fixation-of-a-nitinol-stapes-prosthesis
#8
Florian Schrötzlmair, Fabian Suchan, Thomas Pongratz, Eike Krause, Joachim Müller, Ronald Sroka
BACKGROUND AND OBJECTIVE: Otosclerosis is an inner ear bone disease characterized by fixation of the stapes and consequently progressive hearing loss. One treatment option is the surgical replacement of the stapes by a prosthesis. When so called "smart materials" like nitinol are used, prosthesis fixation can be performed using a laser without manual crimping on the incus. However, specific laser-prosthesis interactions have not been described yet. The aim of the present study was to elucidate the thermo-mechanical properties of the NiTiBOND® prosthesis as a basis for handling instructions for laser-assisted prosthesis fixation...
November 2, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29089282/safety-and-efficacy-of-the-new-micromesh-covered-stent-cguard-in-patients-undergoing-carotid-artery-stenting-early-experience-from-a-single-centre
#9
Renato Casana, Valerio Tolva, Andrea Odero, Chiara Malloggi, Aldo Paolucci, Fabio Triulzi, Vincenzo Silani
OBJECTIVE/BACKGROUND: Plaque protrusion through stent struts represents one of the principal causes of cerebral embolisation during carotid artery stenting (CAS) and the stent healing period. The aim of this study was to evaluate the safety (technical success) and efficacy (clinical success) of the CGuard stent system - a new nitinol stent covered by a closed-cell polyethylene terephthalate mesh designed to prevent embolic events. METHODS: Eighty-two consecutive patients who underwent CAS with CGuard from June 2015 were included in this study...
October 28, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29081013/emerging-technologies-in-flow-diverters-and-stents-for-cerebrovascular-diseases
#10
REVIEW
Michael Karsy, Jian Guan, Andrea A Brock, Anubhav Amin, Min S Park
PURPOSE OF REVIEW: Stents and flow diverters have revolutionized the treatment of cerebrovascular disease. Guglielmi coils, flexible microcatheters, and first-generation intracranial stents, such as Neuroform (Stryker Neurovascular) and Enterprise stents (Codman/DePuy-Synthes), have paved the way for the development of the Pipeline Embolization Device (PED) (ev3/Covidien/Medtronic) and other endovascular approaches. RECENT FINDINGS: This review discusses the historical development of flow diverter technologies from the PED to similar devices, such as the Surpass stent (Stryker Neurovascular), the Flow-Redirection Endoluminal Device (FRED; MicroVention, Inc...
October 28, 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/29073772/radiographic-results-of-nitinol-compression-staples-for-hindfoot-and-midfoot-arthrodeses
#11
Oliver N Schipper, Samuel E Ford, Patrick W Moody, Bryce Van Doren, J Kent Ellington
BACKGROUND: The purpose of this study was to determine the radiographic union rate after midfoot and hindfoot arthrodeses using a new generation of nitinol staples, and to compare outcomes between a nitinol staple construct and a nitinol staple and threaded compression screw construct. METHODS: A retrospective chart review was performed to identify patients who underwent hindfoot or midfoot arthrodesis using a new generation of nitinol compression staples with or without a partially threaded cannulated screw with minimum 3-month radiographic follow-up...
October 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29061728/central-iliac-arteriovenous-anastomosis-for-uncontrolled-hypertension-one-year-results-from-the-rox-control-htn-trial
#12
Melvin D Lobo, Christian Ott, Paul A Sobotka, Manish Saxena, Alice Stanton, John R Cockcroft, Neil Sulke, Eamon Dolan, Markus van der Giet, Joachim Hoyer, Stephen S Furniss, John P Foran, Adam Witkowski, Andrzej Januszewicz, Danny Schoors, Konstantinos Tsioufis, Benno J Rensing, Benjamin Scott, G André Ng, Roland E Schmieder
Creation of a central iliac arteriovenous anastomosis using a novel nitinol coupler device results in an immediate, significant reduction of blood pressure (BP). We present efficacy and safety findings at 12 months post-coupler insertion. This open-label, multicenter, prospective, randomized trial enrolled patients with a baseline office systolic BP ≥140 mm Hg and average daytime ambulatory BP ≥135/85 mm Hg. Subjects were randomly allocated to coupler implantation and continuing previous pharmacotherapy or to maintain previous treatment alone...
October 23, 2017: Hypertension
https://www.readbyqxmd.com/read/29061548/acute-performance-of-a-novel-restorative-transcatheter-aortic-valve-preclinical-results
#13
Yosuke Miyazaki, Osama I Soliman, Mohammad Abdelghani, Athanasios Katsikis, Christophe Naz, Susana Lopes, Boris Warnack, Martijn Cox, Yoshinobu Onuma, Patrick W Serruys
AIMS: The XELTIS aortic valve leaflets are made from a bioabsorbable supramolecular polymer that guides the tissue to restoring itself. It is mounted on a self-expandable nitinol frame that includes three feelers and a native leaflet clipping mechanism. We sought to investigate the acute valve performance in a preclinical setting. METHODS AND RESULTS: In 33 sheep, 26 mm XELTIS aortic valve were transapically implanted in a 23 mm native annulus. Aortography (analysable, n=28) and echocardiography (analysable, n=20) were acquired immediately after implantation of the XELTIS aortic valve to assess the acute device performance...
October 24, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29040141/proof-of-concept-study-for-the-design-manufacturing-and-testing-of-a-patient-specific-shape-memory-device-for-treatment-of-unicoronal-craniosynostosis
#14
Alessandro Borghi, Will Rodgers, Silvia Schievano, Allan Ponniah, Owase Jeelani, David Dunaway
Treatment of unicoronal craniosynostosis is a surgically challenging problem, due to the involvement of coronal suture and cranial base, with complex asymmetries of the calvarium and orbit. Several techniques for correction have been described, including surgical bony remodeling, early strip craniotomy with orthotic helmet remodeling and distraction. Current distraction devices provide unidirectional forces and have had very limited success. Nitinol is a shape memory alloy that can be programmed to the shape of a patient-specific anatomy by means of thermal treatment...
October 16, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29031981/fabrication-and-characterization-of-gefitinib-releasing-polyurethane-foam-as-a-coating-for-drug-eluting-stent-in-the-treatment-of-bronchotracheal-cancer
#15
Weiluan Chen, Chiara di Carlo, Donal Devery, Donnacha J McGrath, Peter E McHugh, Kathrin Kleinsteinberg, Stefan Jockenhoevel, Wim E Hennink, Robbert J Kok
The purpose of the present study was to develop gefitinib-loaded polymeric foams that can be used as coating of drug-eluting stents for palliative treatment of bronchotracheal cancer. Release of such an anticancer drug from such stent coating can retard tumor regrowth into the bronchial lumen. Gefitinib-loaded polyurethane (PU) foams were prepared by embedding either gefitinib micronized crystals or gefitinib-loaded poly(lactic-co-glycolic acid) microspheres in water-blown films, with up to 10% w/w loading for gefitinib microcrystals and 15% w/w for gefitinib microspheres (corresponding to 1...
October 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29030033/a-low-cost-biosorbent-based-coating-for-the-highly-sensitive-determination-of-organochlorine-pesticides-by-solid-phase-microextraction-and-gas-chromatography-electron-capture-detection
#16
Sângela Nascimento do Carmo, Josias Merib, Adriana Neves Dias, Joni Stolberg, Dilma Budziak, Eduardo Carasek
In this study, an environmentally friendly and low-cost biosorbent coating was evaluated, for the first time, as the extraction phase for solid-phase microextraction (SPME) supported on a nitinol alloy. The characterization of the new fiber was performed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The applicability of the biosorbent-based fiber in the determination of δ-hexachlorocyclohexane, aldrin, heptachlor epoxide, α-endosulfan, endrin and 4,4'-DDD in water samples was verified, with separation/detection by gas chromatography coupled to electron capture detection (GC-ECD)...
October 7, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29020933/partially-covered-metal-stents-have-longer-patency-than-uncovered-and-fully-covered-metal-stents-in-the-management-of-distal-malignant-biliary-obstruction-a-retrospective-study
#17
Yudai Yokota, Mitsuharu Fukasawa, Shinichi Takano, Makoto Kadokura, Hiroko Shindo, Ei Takahashi, Sumio Hirose, Satoshi Kawakami, Yoshimitsu Fukasawa, Tadashi Sato, Nobuyuki Enomoto
BACKGROUND: Self-expandable metal stents (SEMSs) are widely used for malignant biliary obstructions. Nitinol-covered SEMSs have been developed to improve stent patency. Currently, SEMSs may be uncovered, partially covered, or fully covered; however, there is no consensus on the best stent type for the management of malignant distal biliary obstruction (MDBO). METHODS: Patients with unresectable MDBO receiving SEMS (Wallflex™) were retrospectively analyzed. Time to recurrent biliary obstruction (TRBO) and survival time were compared among the three types of SEMSs...
October 11, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/28982276/it-is-time-for-a-better-clip-applier-3%C3%A2-mm-percutaneous-non-crushing-and-locking
#18
Jonathan B Yuval, Daniel J Weiss, Adrian Paz, Yehuda Bachar, Ronit Brodie, Yinon Shapira, Yoav Mintz
INTRODUCTION: Since the advent of laparoscopy there have been attempts to minimize abdominal wall incisions. For this purpose smaller instruments have been produced. Our aim was to develop the first 3 mm percutaneous clip applier and to make it better than the standard clips of today. MATERIAL AND METHODS: The ClipTip clip is made of Nitinol and has a crocodile shaped jaws, which when apposed effectively seal vessels. The shaft operates as a retractable needle permitting percutaneous insertion...
October 6, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/28978866/two-year-clinical-outcomes-post-implantation-of-epic-tm-self-expanding-nitinol-stents-for-the-aortoiliac-occlusive-disease-in-patients-with-peripheral-arterial-disease
#19
Takuya Tsujimura, Osamu Iida, Masashi Fujita, Masaharu Masuda, Shin Okamoto, Takayuki Ishihara, Kiyonori Nanto, Takashi Kanda, Shota Okuno, Yasuhiro Matsuda, Masahiko Fujihara, Yoshiaki Yokoi, Toshiaki Mano
AIM: We investigated 2-year clinical outcomes after implantaton of Epic(TM) self-expanding nitinol stents for patients with peripheral artery disease (PAD) due to the aortoiliac occlusive disease (AIOD). METHODS: This study was a multicenter and retrospective study. From February 2013 through October 2014, 292 lesions (chronic total occlusion, 21%; TASC Ⅱ C/D, 35%) in 217 consecutive patients (74±8 years; male, 81%; diabetes mellitus, 47%; dialysis, 21%; critical limb ischemia, 29%) who had undergone endovascular therapy (EVT) with Epic(TM) self-expanding nitinol stents for PAD with AIOD were analyzed...
October 5, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28968416/complications-of-stent-placement-in-patients-with-esophageal-cancer-a-systematic-review-and-network-meta-analysis
#20
REVIEW
Amin Doosti-Irani, Mohammad Ali Mansournia, Abbas Rahimi-Foroushani, Peiman Haddad, Kourosh Holakouie-Naieni
BACKGROUND: Palliative treatments and stents are necessary for relieving dysphagia in patients with esophageal cancer. The aim of this study was to simultaneously compare available treatments in terms of complications. METHODS: Web of Science, Medline, Scopus, Cochrane Library and Embase were searched. Statistical heterogeneity was assessed using the Chi2 test and was quantified by I2. The results of this study were summarized in terms of Risk Ratio (RR). The random effects model was used to report the results...
2017: PloS One
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