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https://www.readbyqxmd.com/read/29334079/first-heating-measurements-of-endovascular-stents-in-magnetic-particle-imaging
#1
Franz Wegner, Thomas Friedrich, Nikolaos Panagiotopoulos, Sarah Vaalma, Jan Peter Goltz, Florian M Vogt, Martin A Koch, Thorsten M Buzug, Joerg Barkhausen, Julian Haegele
Magnetic Particle Imaging (MPI) is a three-dimensional imaging method which visualizes the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) with oscillating and static magnetic fields. It is a quantitative method as the intensity of its signal is proportional to the concentration of the SPIOs. Due to its quantitativeness, high temporal resolution and kidney-safe tracers it is proposed to be a very promising noninvasive method for cardiovascular imaging. In this regard MPI in the presence of endovascular stents and assessment of stent patency with MPI has to be evaluated...
January 15, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29315645/a-preliminary-study-of-pulmonary-vein-implant-applicability-and-safety-as-a-potential-ablation-platform-in-a-follow-up-study-in-pigs
#2
Tim Vandecasteele, Stijn Schauvliege, Matthew Philpott, Eli Clement, Gunther van Loon, Lisse Vera, Tim Boussy, Thomas van Bergen, Wim Van Den Broeck, Pieter Cornillie, Glenn Van Langenhove
BACKGROUND: Recurrence of atrial fibrillation after an ablation procedure remains a major problem which emphasizes the need for improved pulmonary vein isolation techniques. AIMS: The aim of this study was to describe an implantation procedure of a pulmonary vein-stent which may possibly serve as an ablation technique in the future and to examine stent safety in a follow-up study in pigs. METHODS AND RESULTS: Eight pigs were catheterized and nine self-expanding nitinol stents were implanted through a transfemoral or transatrial approach into the antra of the pulmonary veins...
January 8, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29285955/novel-nitinol-stent-for-lesions-up-to-24-cm-in-the-superficial-femoral-and-proximal-popliteal-arteries-24-month-results-from-the-tigris-randomized-trial
#3
John R Laird, Thomas Zeller, Christian Loewe, Jack Chamberlin, Richard Begg, Peter A Schneider, Aravinda Nanjundappa, Frank Bunch, Scott Schultz, Stuart Harlin, Alexandra Lansky, Michael R Jaff
PURPOSE: To evaluate the safety and effectiveness of the TIGRIS stent for lesions up to 24 cm in the superficial femoral and proximal popliteal arteries (SFA/PPA). METHODS: This prospective, multicenter, randomized study enrolled 274 subjects at 36 sites in the United States and Europe. Subjects were randomly assigned in a 3:1 ratio to treatment with the TIGRIS stent (n=197; mean age 66.7±9.28 years; 141 men) or LifeStent (n=70; mean age 67.9±8.87 years; 49 men)...
December 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29276228/retinal-nerve-fiber-layer-defect-and-paracentral-scotoma-after-internal-limiting-membrane-peeling-with-a-nitinol-loop
#4
Ryo Matoba, Yuki Morizane, Shuhei Kimura, Shinji Toshima, Fumio Shiraga
Internal limiting membrane (ILM) peeling is an important maneuver in vitrectomy for macular holes (MHs). A nitinol loop is a surgical instrument designed to create an edge on the ILM and peel the ILM safely and consistently. The effect of using a nitinol loop for ILM peeling on the retina is not clear. We report here on a case of an idiopathic full-thickness MH in an adult woman, in whom retinal damage was revealed after her ILM was peeled using a nitinol loop.
December 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/29258527/case-report-osteogenesis-imperfecta-internal-mammary-artery-graft-nitinol-clips
#5
Ludovic Melly, Anne-Sophie Dincq, Claude Hanet, Benoît Rondelet
BACKGROUND: Osteogenesis imperfecta is a genetic disorder of connective tissue causing mostly left-sided heart valves and aortic root pathologies, but a coronary artery involvement reflecting an increased sensitivity to cardiovascular risk factors is also suspected in this patient population. CASE PRESENTATION: We report a 38-year-old patient with an osteogenesis imperfecta and a typical presentation of an acute myocardial infarction. The coronary angiogram showed a coronary 3-vessel disease...
December 19, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29239687/open-cell-stent-and-use-of-cone-beam-ct-enables-a-safe-and-effective-coil-embolization-of-true-ophthalmic-artery-and-anterior-choroidal-artery-aneurysms-with-preservation-of-parent-vessel-clinical-and-angiographic-results
#6
Samuel Y Hou, Anna Luisa Kühn, Ajit S Puri, Ajay K Wakhloo
Background Treatment of true ophthalmic artery (OA) or anterior choroidal artery (AChA) aneurysms with preservation of the parent vessel may be challenging. Flow diverters have limitations when dealing with branch vessels arising from the aneurysm sac. Visual loss or AChA territory infarcts have been reported both for surgical and endovascular treatment. Methods We evaluated the safety and efficacy of an open-cell design, laser-cut, self-expanding Nitinol stent, and use of cone-beam computed tomography (CBCT) for stent-assisted coil embolization...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29238643/factors-associated-with-clinical-outcomes-after-lumbar-interbody-fusion-with-a-porous-nitinol-implant
#7
Fahad H Abduljabbar, Asim M Makhdom, Mona Rajeh, Alisson R Tales, Jacob Mathew, Jean Ouellet, Michael Weber, Peter Jarzem
Study Design: A retrospective cohort study. Objective: The aim of this study is to assess the association of demographic and perioperative factors with clinical outcomes of lumbar interbody fusion with a porous nitinol (TiNi) implant for degenerative disc disease. Methods: Forty-one patients with degenerative lumbar disease were prospectively followed for a mean of 4.8 years. All patients were instrumented with porous TiNi interbody fusion devices...
December 2017: Global Spine Journal
https://www.readbyqxmd.com/read/29237489/self-expanding-nitinol-stents-of-high-versus-low-chronic-outward-force-in-de-novo-femoropopliteal-occlusive-arterial-lesions-bioflex-cof-trial-study-protocol-for-a-randomized-controlled-trial
#8
Alexander Wressnegger, Alexandra Kaider, Martin A Funovics
BACKGROUND: Self-expanding nitinol stents must be oversized at least by a minimal amount to ensure contact with the vessel wall and prevent migration. Once the stent is deployed it exerts a continuous force upon the vascular wall, termed chronic outward force (COF). Animal studies have found an increased neointimal hyperplasia in stents with high oversizing and thus high COF. Data about correlation between COF and neointimal hyperplasia in humans are currently lacking. The objective of the BIOFLEX-COF trial is to prospectively investigate differences in formation of intimal hyperplasia at 1 and 2 years after implantation of nitinol stents with high versus low COF in de novo femoropopliteal occlusive arterial lesions...
December 14, 2017: Trials
https://www.readbyqxmd.com/read/29224939/the-association-of-statin-therapy-with-the-primary-patency-of-femoral-and-popliteal-artery-stents
#9
Derek de Grijs, Pedro Teixeira, Steven Katz
OBJECTIVE: It has long been known that hydroxymethylglutaryl-coenzyme A reductase inhibitors (statins) broadly reduce cardiovascular events in patients with peripheral vascular disease. It was the goal of this study to determine whether there is an association between statin therapy and primary patency after stenting of superficial femoral and popliteal arteries. METHODS: The records of all patients undergoing primary nitinol stenting of the femoral and popliteal arteries at a single institution and by a single surgeon during a 10-year period were reviewed...
December 7, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29219253/first-experience-of-the-usage-of-a-gore-cardioform-septal-occluder-device-for-treatment-of-a-significant-residual-commissural-mitral-regurgitation-jet-following-a-mitraclip-procedure
#10
Yoshifumi Nakajima, Saibal Kar
The MitraClip (Abbott Vascular, Santa Clara, CA) procedure has emerged as a safe and effective treatment option for treatment of selected patients with severe mitral regurgitation (MR) who are at high risk for surgery. Effective reduction of MR is important to ensure an optimal clinical outcome. We present here the first case report of a significant commissural leak after a MitraClip procedure treated with a GORE CARDIOFORM Septal Occluder device (WL Gore & Associates, Flagstaff, AZ). CASE REPORT: An 81-year-old male presented with symptomatic recurrent MR following a MitraClip procedure using two clips...
December 8, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29217340/supera-stent-outcomes-in-above-the-knee-interventions-effects-of-compression-and-elongation-sake-compel-sub-study
#11
Hemal Bhatt, Richard Kovach, Sean Janzer, Jon C George
INTRODUCTION: The interwoven nitinol design of the Supera stent has been shown to have superior radial strength and fracture resistance resulting in higher patency rates at 6 and 12months. A detailed sub-analysis of SUPERB trial showed differences in patency based on stent conformation post deployment. We evaluated the patency of the stent within the SAKE study cohort based on stent deployment conformation. METHODS: We retrospectively evaluated the medical records of 63 patients (77 limbs) with Rutherford class 2-5 symptoms who received Supera stents in the femoro-popliteal artery from March 2010 through May 2011 as part of the SAKE study...
November 16, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29216731/preclinical-testing-of-a-combination-stone-basket-and-ureteral-balloon-to-extract-ureteral-stones
#12
Rustin Massoudi, Thomas J Metzner, Buzz Bonneau, Tin Chan Ngo, Rajesh Shinghal, John T Leppert
We have developed the Peralta Stone Extraction System to increase the safety of ureteral stone extraction. The device combines a nitinol stone basket and low-pressure balloon into a single device. After visualization, the stone is captured in the tipless nitinol basket and enveloped by a low-pressure balloon. We tested the performance of device prototypes in a porcine model using stone mimics with diameters ranging from 4.2 to 6.2mm. Stones extracted with the device required less force when compared with stones in a standard ureteral stone basket...
December 7, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/29205938/peptide-functionalized-polyurethane-coatings-prepared-via-grafting-to-strategy-to-selectively-promote-endothelialization
#13
Xin Ding, Willy Chin, Chuen Neng Lee, James L Hedrick, Yi Yan Yang
Endothelialization, formation of endothelial cells (ECs) layer on cardiovascular implant surface, is considered an ideal approach to prevent restenosis (renarrowing of blood vessel mainly due to the accumulation of proliferated vascular smooth muscle cells, SMCs) and thrombosis. In this study, the possibility of using polyurethane (PU) as a coating platform for functionalization with peptide to enhance endothelialization on implants is explored. PUs are synthesized through metal-free organocatalytic polymerization followed by chemical conjugation with an EC-specific REDV peptide through thiol-ene reaction...
December 4, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29200440/erratum-endoscopic-ultrasound-guided-gallbladder-drainage-for-acute-cholecystitis-with-a-silicone-covered-nitinol-short-bilaterally-flared-stent-a-case-series
#14
Raffaele Manta, Claudio Zulli, Angelo Zullo, Edoardo Forti, Alberto Tringali, Lorenzo Dioscoridi, Francesco Zito, Helga Bertani, Rita Conigliaro, Massimiliano Mutignani
[This corrects the article DOI: 10.1055/s-0043-118659.].
November 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29189831/-newer-generation-self-expandable-coronary-stent-bail-out-re-sheathing
#15
Alberto Barioli, Massimo Napodano, Giuseppe Tarantini
Newer generation of self-expandable nitinol coronary stents has proven to be useful in the treatment of bifurcations, tapered vessels, thrombotic lesions, venous grafts and ectatic segments. However, optimal device positioning can be cumbersome, due to the peculiar delivery mechanism which consists of retracting an outer sheath in order to release the stent from the distal edge. We report the case of a 53-year-old man, admitted for unstable angina. Coronary angiography showed a tight stenosis of the proximal left anterior descending coronary artery...
December 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/29186411/late-onset-of-pneumothorax-after-bronchoscopic-lung-volume-reduction-due-to-migration-of-a-nitinol-coil
#16
Francesco Mongelli, Stefano Cafarotti, Matteo Di Giuseppe, Miriam Patella
The use of Endobronchial coils are a relatively new brochoscopic technique for lung volume reduction. They appear to be safe and effective in improving quality of life, reducing morbidity and mortality related to the primary disease, while avoiding the many risks of morbidity and mortality associated with surgery. Nevertheless, some complications, such as pneumothorax, are relatively common in the periprocedural period. We describe a case of pneumothorax that occurred several days after brochoscopic technique for lung volume reduction due to direct perforation of the visceral pleura by a coil...
November 27, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29159684/early-experience-with-a-new-concept-of-angioplasty-nitinol-constrained-balloon-catheter-chocolate-%C3%A2-in-severely-claudicant-patients
#17
Pasqualino Sirignano, Wassim Mansour, Alessandro d'Adamo, Simone Cuozzo, Laura Capoccia, Francesco Speziale
BACKGROUND: To report our experience in treating severely claudicant patients, employing a "nitinol-constrained" balloon (Chocolate, TriReme Medical Inc., Pleasanton, CA-USA) before drug-coated balloon (DCB) in a standardized protocol. METHODS: Eighty-one (84 limbs) consecutive Rutherford category (RC) 3 patients treated between December 2014 and December 2016 for superficial femoral artery (SFA) and popliteal arterial (PA) disease by nitinol-constrained balloon followed by DCB were enrolled...
November 20, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29158017/left-atrial-appendage-occlusion-exclusion-procedural-image-guidance-with-transesophageal-echocardiography
#18
REVIEW
Alan F Vainrib, Serge C Harb, Wael Jaber, Ricardo J Benenstein, Anthony Aizer, Larry A Chinitz, Muhamed Saric
Atrial fibrillation is the most common arrhythmia worldwide and is a major risk factor for embolic stroke. In this article, the authors describe the crucial role of two- and three-dimensional transesophageal echocardiography in the pre- and postprocedural assessment and intraprocedural guidance of percutaneous left atrial appendage (LAA) occlusion procedures. Although recent advances have been made in the field of systemic anticoagulation with the novel oral anticoagulants, these medications come with a significant risk for bleeding and are contraindicated in many patients...
November 17, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29146831/stent-assisted-coiling-of-cerebral-aneurysms-a-single-center-clinical-and-angiographic-analysis
#19
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
#20
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
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