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https://www.readbyqxmd.com/read/29776653/accuracy-of-phase-contrast-velocity-mapping-proximal-and-distal-to-stent-artifact-during-cardiac-magnetic-resonance-imaging
#1
Catherine M Avitabile, Matthew A Harris, Ravi S Doddasomayajula, Steven G Chopski, Matthew J Gillespie, Yoav Dori, Andrew C Glatz, Mark A Fogel, Kevin K Whitehead
Little data are available on the accuracy of phase-contrast magnetic resonance imaging (PC-MRI) velocity mapping in the vicinity of intravascular metal stents other than nitinol stents. Therefore, we sought to determine this accuracy using in vitro experiments. An in vitro flow phantom was used with 3 stent types: (1) 316L stainless steel, (2) nitinol self-expanding, and (3) platinum-iridium. Steady and pulsatile flow was delivered with a magnetic resonance imaging-compatible pump (CardioFlow 5000, Shelley Medical, London, Ontario, Canada)...
April 20, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29743899/drug-coated-balloon-in-superficial-femoral-artery-in-stent-restenosis
#2
REVIEW
Donato Gerardi, Arturo Alfani, Tullio Tesorio, Angelo Cioppa, Giovanni Esposito, Eugenio Stabile
The femoropopliteal artery is one of the commonest sites of involvement in peripheral artery disease (PAD) leading to intermittent claudication and/or critical limb ischemia. Endovascular therapy for superficial femoral artery (SFA) disease has been recognized as a safe and efficient therapy and is recommended by current guidelines as the first-line approach. Although the widespread use of new-generation, self-expanding, nitinol stents in SFA stenosis has reduced the shortcomings associated with plain old balloon angioplasty (POBA), lumen renarrowing at the stented (in-stent restenosis - ISR) level still represents a relevant clinical problem, because of higher risk of recurrent ISR, occlusion and surgical revascularization compared to de-novo lesions...
2018: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/29736692/design-modelling-and-teleoperation-of-a-2-mm-diameter-compliant-instrument-for-the-da-vinci-platform
#3
P Francis, K W Eastwood, V Bodani, T Looi, J M Drake
This work explores the feasibility of creating and accurately controlling an instrument for robotic surgery with a 2 mm diameter and a three degree-of-freedom (DoF) wrist which is compatible with the da Vinci platform. The instrument's wrist is composed of a two DoF bending notched-nitinol tube pattern, for which a kinematic model has been developed. A base mechanism for controlling the wrist is designed for integration with the da Vinci Research Kit. A basic teleoperation task is successfully performed using two of the miniature instruments...
May 7, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29721424/nir-triggered-crystal-phase-transformation-of-niti-layered-double-hydroxides-films-for-localized-chemothermal-tumor-therapy
#4
Donghui Wang, Naijian Ge, Tingting Yang, Feng Peng, Yuqin Qiao, Qianwen Li, Xuanyong Liu
Construction of localized drug-eluting systems with synergistic chemothermal tumor-killing abilities is promising for biomedical implants directly contacting with tumor tissues. In this study, an intelligent and biocompatible drug-loading platform, based on a gold nanorods-modified butyrate-inserted NiTi-layered double hydroxides film (Au@LDH/B), is prepared on the surface of nitinol alloy. The prepared films function as drug-loading "sponges," which pump butyrate out under near-infrared (NIR) irradiation and resorb drugs in water when the NIR laser is shut off...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29705283/what-s-new-in-tind
#5
REVIEW
Julian Marcon, Giuseppe Magistro, Christian G Stief, Tobias Grimm
CONTEXT: There is growing interest in minimally invasive (MI) treatment options for male lower urinary tract symptoms (LUTS). Among these options, the temporary implantable nitinol device (TIND; Medi-Tate, Or Akiva, Israel) is a novel instrument used to alleviate symptoms by creating incisions in the prostate via mechanical stress. OBJECTIVE: To review recent data for TIND as an MI procedure to improve LUTS. EVIDENCE ACQUISITION: Medline, PubMed, the Cochrane Database, and Embase were screened for clinical trials, randomized controlled trials, and review articles on the use of TIND in patients with male LUTS...
April 26, 2018: European Urology Focus
https://www.readbyqxmd.com/read/29700686/follow-up-of-temporary-implantable-nitinol-device-tind-implantation-for-the-treatment-of-bph-a-systematic-review
#6
REVIEW
Riccardo Bertolo, Cristian Fiori, Daniele Amparore, Francesco Porpiglia
PURPOSE OF REVIEW: The purpose of the present systematic review is to offer a narrative synthesis of the available literature regarding the role of the temporary implantable nitinol device (TIND) (Medi-Tate®; Medi-Tate Ltd., Or Akiva, Israel) for the treatment of benign prostatic hyperplasia (BPH)-related lower urinary tract symptoms (LUTS), specifically focusing on the follow-up data. RECENT FINDINGS: Current available evidences are limited in this topic. Sample size of patients available for analysis is small...
April 26, 2018: Current Urology Reports
https://www.readbyqxmd.com/read/29684517/nickel-related-adverse-reactions-in-the-treatment-of-cerebral-aneurysms-a-literature-review
#7
REVIEW
Anderson Chun On Tsang, Patrick Nicholson, Vitor Mendes Pereira
BACKGROUND: Nickel is the most common metal allergen and predominantly affects women. It is also the ubiquitous component in the alloys used to manufacture intracranial devices for aneurysm treatments, including aneurysm clips, self-expanding stents, flow-diverting stents and endosaccular occlusion devices. Adverse events related to nickel-allergy after deployment of such devices are uncommon but can be severe, resulting in dilemmas in the choice of treatment strategies and devices in managing nickel-sensitive patients with intracranial aneurysms...
April 20, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29682350/swirling-flow-and-wall-shear-evaluating-the-biomimics-3d-helical-centerline-stent-for-the-femoropopliteal-segment
#8
REVIEW
Timothy M Sullivan, Thomas Zeller, Masato Nakamura, Colin G Caro, Michael Lichtenberg
The BioMimics 3D self-expanding nitinol stent represents a strategy for femoropopliteal intervention that is alternative or complementary to deployment of drug-coated stents or balloons. Whereas conventional straight stents reduce arterial curvature and disturb blood flow, creating areas of low wall shear, where neointimal hyperplasia predominantly develops, the helical centerline geometry of the BioMimics 3D maintains or imparts arterial curvature, promotes laminar swirling blood flow, and elevates wall shear to protect against atherosclerosis and restenosis...
2018: International Journal of Vascular Medicine
https://www.readbyqxmd.com/read/29678784/feasibility-safety-and-efficacy-of-a-novel-pre-shaped-nitinol-esophageal-deviator-to-successfully-deflect-the-esophagus-and-ablate-left-atrium-without-esophageal-temperature-rise-during-atrial-fibrillation-ablation-the-deflect-gut-study
#9
Valay Parikh, Vijay Swarup, Jacob Hantla, Venkat Vuddanda, Tawseef Dar, Bharath Yarlagadda, Luigi Di Biase, Amin Al-Ahmad, Andrea Natale, Dhanunjaya Lakkireddy
BACKGROUND: Esophageal thermal injury is a feared complication of radiofrequency ablation (RFA) for atrial fibrillation (AF). Rise in luminal esophageal temperature (LET) limits the ability to deliver RF energy on posterior wall of LA. OBJECTIVE: The aim of this registry was to evaluate feasibility, safety and efficacy of a mechanical esophageal deviation (ED) tool during AF ablation. METHODS: We evaluated 687 patients who underwent RFA for AF...
April 17, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29678649/nine-month-outcomes-of-the-durability-iliac-study-on-self-expanding-stents-for-symptomatic-peripheral-artery-disease
#10
Peter Faries, Michael Jaff, Patrick Peeters, Yazan Khatib, David Roberts, Marc Bosiers, Rajesh Malik, Reid Ravin, John Rundback
OBJECTIVE: The DURABILITY Iliac clinical study evaluated the safety and effectiveness of two nitinol self-expanding stents for the treatment of atherosclerotic common and external iliac artery lesions up to 10 cm in length and >50% stenosis in subjects with Rutherford Classification peripheral arterial disease stages 2-4. METHODS: DURABILITY Iliac was a prospective, multicenter, core lab adjudicated, nonrandomized clinical study enrolling 75 subjects from 15 sites in the United States and Europe...
April 17, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29669780/microinterventional-endocapsular-nucleus-disassembly-novel-technique-and-results-of-first-in-human-randomised-controlled-study
#11
Tsontcho Ianchulev, David F Chang, Edward Koo, Susan MacDonald, Ernesto Calvo, Farrell Toby Tyson, Andrea Vasquez, Iqbal Ike K Ahmed
AIM: To assess the safety and efficacy of microinterventional endocapsular nuclear fragmentation in moderate to severe cataracts. METHODS: This was a prospective single-masked multisurgeon interventional randomised controlled trial (ClinicalTrials.gov NCT02843594) where 101 eyes of 101 subjects with grade 3-4+ nuclear cataracts were randomised to torsional phacoemulsification alone (controls) or torsional phacoemulsification with adjunctive endocapsular nuclear fragmentation using a manual microinterventional nitinol filament loop device (miLOOP group)...
April 18, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29664761/initial-clinical-experience-with-a-flexible-peripheral-21-g-needle-device
#12
Alain Tremblay, Renelle Myers, Eve-Lea Beaudoin, Martina Bonifazi, Antoine Delage, Marc Fortin, Christopher A Hergott, Paul R MacEachern, Tawimas Shaipanich, Benjamin Shieh, Stefano Gasparini, Stephen Lam
BACKGROUND: Bronchoscopic techniques can be used to safely sample peripheral lung nodules (PLN), and transbronchial needle aspiration (TBNA) can further increase the diagnostic yield. Current needle devices not necessarily designed for this indication have limitations. We report our initial experience with a new flexible nitinol peripheral TBNA needle specifically designed for such sampling. METHODS: Retrospective case review describing the first clinical cases performed with a commercially available 21-G peripheral TBNA device in 4 centers...
April 16, 2018: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/29658107/malleostapedotomy-in-stapes-revision-surgery-is-an-endoscopic-approach-possible
#13
Giannicola Iannella, Diletta Angeletti, Alessandra Manno, Benedetta Pasquariello, Massimo Re, Giuseppe Magliulo
OBJECTIVES/HYPOTHESIS: The purpose of the present study was to show our preliminary results regarding the endoscopic ear surgery application in malleostapedotomy surgery. STUDY DESIGN: Case series. METHODS: Six patients (four females and two males) who underwent endoscopic ear surgery as revision surgery for otosclerosis were enrolled in this study. For endoscopic malleostapedotomy surgery, rigid angled endoscopes at 0 ° and 30 ° with a length of 14 cm and an outer diameter of 3 and 4 mm were used...
April 15, 2018: Laryngoscope
https://www.readbyqxmd.com/read/29653383/characterizing-fretting-damage-in-different-test-media-for-cardiovascular-device-durability-testing
#14
J D Weaver, L Ramirez, S Sivan, M Di Prima
In vitro durability tests of cardiovascular devices are often used to evaluate the potential for fretting damage during clinical use. Evaluation of fretting damage is important because severe fretting can concentrate stress and lead to the loss of structural integrity. Most international standards call for the use of phosphate buffered saline (PBS) for such tests although there has been little evidence to date that the use of PBS is appropriate in terms of predicting the amount of fretting damage that would occur in vivo...
April 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29597023/impact-of-nitinol-stent-surface-processing-on-in-vivo-nickel-release-and-biological-response
#15
Srinidhi Nagaraja, Stacey J L Sullivan, Phillip R Stafford, Anne D Lucas, Elon Malkin
Although nitinol is used widely in percutaneous cardiovascular interventions, a causal relationship between nickel released from implanted cardiovascular devices and adverse systemic or local biological responses has not been established. The objective of this study was to investigate the relationship between nitinol surface processing, in-vivo nickel release, and biocompatibility. Nitinol stents manufactured using select surface treatments were implanted into the iliac arteries of minipigs for 6 months. Clinical chemistry profile, complete blood count, serum and urine nickel analyses were performed periodically during the implantation period...
March 26, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29563208/development-of-an-intracranial-dural-arteriovenous-fistula-after-venous-sinus-stenting-for-idiopathic-intracranial-hypertension
#16
Thomas J Buell, Daniel M Raper, Dale Ding, Ching-Jen Chen, Kenneth C Liu
We report a case in which an intracranial dural arteriovenous fistula (DAVF) developed after endovascular treatment of a patient with idiopathic intracranial hypertension with venous sinus stenting (VSS). The pathogenesis may involve hemodynamic alterations secondary to increased poststenting venous sinus pressure, which may cause new arterial ingrowth into the fistulous sinus wall without capillary interposition. Despite administration of dual antiplatelet therapy, there may also be subclinical cortical vein thrombosis that contributed to DAVF formation...
March 21, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29552985/commentary-the-unsupported-nitinol-main-body-of-the-ovation-device-blamed-more-often-than-deserved
#17
Efstratios Georgakarakos, Andreas Koutsoumpelis
No abstract text is available yet for this article.
April 2018: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29550177/outcomes-of-endovascular-reconstruction-of-the-inferior-vena-cava-with-self-expanding-nitinol-stents
#18
Tim Sebastian, Jörn F Dopheide, Rolf P Engelberger, David Spirk, Nils Kucher
BACKGROUND: Occlusion of the inferior vena cava (IVC) often causes venous claudication, leg swelling, or skin changes. We hypothesized that the outcome of nitinol stents for endovascular reconstruction of the IVC is similar to the outcome reported for steel alloy stents. METHODS: From the prospective Bern Venous Stent Registry, we investigated technical success, patency rates, and clinical outcome in consecutive patients with endovascular IVC reconstruction. During routine follow-up visits, stent patency was assessed by duplex ultrasound...
May 2018: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/29547060/interventional-radiology-operated-cholecystoscopy-for-the-management-of-symptomatic-cholelithiasis-approach-technical-success-safety-and-clinical-outcomes
#19
Nishant Patel, Jeffrey Forris Beecham Chick, Joseph J Gemmete, Jordan C Castle, Narasimham Dasika, Wael E Saad, Ravi N Srinivasa
OBJECTIVE: The objective of our study was to report the technique, complications, and clinical outcomes of interventional radiology-operated cholecystoscopy with stone removal for the management of symptomatic cholelithiasis. MATERIALS AND METHODS: Ten (77%) men and three (23%) women (mean age, 65 years) with symptomatic cholelithiasis underwent cholecystostomy followed by interventional radiology-operated cholecystoscopy with stone removal. Major comorbidities precluding cholecystectomy included prior cardiac, pulmonary, or abdominal surgery; cirrhosis; sepsis with hyponatremia; seizure disorder; developmental delay; and cholecystoduodenal fistula...
March 16, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29546502/biocompatibility-of-new-materials-based-on-nano-structured-nitinol-with-titanium-and-tantalum-composite-surface-layers-experimental-analysis-in-vitro-and-in-vivo
#20
Mikhail A Sevost'yanov, Elena O Nasakina, Alexander S Baikin, Konstantin V Sergienko, Sergey V Konushkin, Mikhail A Kaplan, Alexey V Seregin, Alexander V Leonov, Valery A Kozlov, Alexey V Shkirin, Nikolai F Bunkin, Alexey G Kolmakov, Sergey V Simakov, Sergey V Gudkov
A technology for obtaining materials from nanostructured nitinol with titanium- or tantalum-enriched surface layers was developed. Surface layers enriched with titanium or tantalum were shown to provide a decrease in the formation of reactive oxygen species and long-lived protein radicals in comparison to untreated nitinol. It was determined that human peripheral vessel myofibroblasts and human bone marrow mesenchymal stromal cells grown on nitinol bases coated with titanium or tantalum-enriched surface layers exhibit a nearly two times higher mitotic index...
March 15, 2018: Journal of Materials Science. Materials in Medicine
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