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Showing 1 to 20 of 145 for “"stents"”.
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Pulsatile Electropolishing of Nitinol Stents
Alloys that oxidize easily such as those containing titanium or chromium present a challenge to electropolishing because the polarization that dissolves the metal species produces positive ions, these oxidize and form stable surface layers of metallic oxides that prevent further dissolution. This …
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Stents for transcatheter aortic valve replacement
… and test novel compressible balloon-expandable stents suitable for patients with symptomatic rheumatic aortic valve disease, and which would allow for a percutaneous polymeric valve to be manufactured, be crimped onto balloon-based devices, and be expanded into a compliant or non-calcific native …
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Comparison of double-layered(ComVi) stents with polyurethane covered stents in palliative treatment of unresectable malignant gastroduodenal obstruction
배경: 자가팽창형 금속스텐트는 악성 위십이지장 폐쇄의 고식적 치료에 현재까지 널리 사용되고 있다. 자가팽창형 금속스텐트에는 피막형과 비피막형의 두 가지 종류가 있는데, 비피막형 스텐트의 경우 종양의 내증식으로 인한 폐쇄가 빈번하다는 단점이 있으며, 피막형 스텐트의 경우 스텐트의 일탈이 문제가 되었다. 따라서 이 문제를 해결하기 위해 새로운 이중막 스텐트(ComVi)가 개발되었으며, 이는 피막형 스텐트 표면에 금속망을 더하여 종양의 내증식과 스텐트의 일탈을 동시에 줄일 수 있도록 고안되었다. 본 연구는 악성 위십이지장 폐쇄 환자에서 …
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Τοποθέτηση μεταλλικών stents στον ουρητήρα : υδροδυναμικές μεταβολές
… να συγκρίνει τις απλές μεταλλικές ενδοπροθέσεις (stents) με τις εσωτερικά και εξωτερικά επικαλυπτόμενες μεταλλικές ενδοπροθέσεις σε πειραματόζωο χοίρο. Τοποθετήθηκαν μεταλλικά stents σε 9 θηλυκούς χοίρους που ζύγιζαν 25-30 κιλά. Τοποθετήθηκαν stent σε 18 ουρητήρες είτε στον δεξιό είτε στον …
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Análise morfométrica digital na parede aórtica de suínos após implante de stents não revestidos versus stents revestidos com dacron
Os stents são dispositivos intravasculares implantados com o objetivo de dilatar ou fixar a placa de colesterol contra a parede arterial. O objetivo avaliar dois tipos de stents de aço inoxidável, um recoberto com poliéster (dacron) e outro não recoberto, implantados na aorta infra-renal de suínos …
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Development and Evaluation of 3D-Printed Cardiovascular Stents
Biodegradable stents (BDS) could be a promising alternative to the conventional metallic stents for the treatment of atherosclerosis which is a coronary artery disease (CAD). Three-dimensional (3D) printing technique has offered easy and fast fabrication of BDS with enhanced reproducibility and …
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A system for impedance characterization of coronary stents
Stents are used to re-open and maintain flow in diseased coronary arteries in patients suffering from coronary heart disease. Drug-eluting stents are now the preferred choice of stent but their performance is still limited by delayed healing of the important endothelial cell layer that lines the …
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Remote controlled drug release in drug-eluting stents
… successful coronary intervention, drug-eluting stents are placed within obstructive arteries to restore blood flow to the heart and reverse life-threatening consequences. However, it is still plagued by the resurrection of artery occlusion, resulted by stent-induced restenosis.This battling and …
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Personalized absorbable gastrointestinal stents for intestinal fistulae and perforations
… to further complications. Currently available stents are non-absorbable, are manufactured in a narrow size range, and/or are limited to usage in locations that are accessible for endoscopic removal post-healing. The use of 3D-printed bioresorbable polymeric stents will provide patients with a …
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Tantalmodifikationen auf Implantat-Stahl für kardiale Stents, Herstellung und Charakterisierung
Mit Hilfe der PVD-Technik (Physical Vapour Disposition) hergestellte Tantal/Tantaloxidschichten auf Edelstahlplättchen wurden bezüglich ihrer mechanischen Eigenschaften und ihrer Biokompatibilität untersucht. Dabei kamen als Untersuchungsmethoden die Rasterelektronenmikroskopie (REM), das XRD …
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Developing polypyrrole coated coronary stents for extended release of Sirolimus
… Amongst all the treatment options, drug-eluting stents (DES) are thought to be the most effective method of treatment for the majority of patients. Despite the early success of DES in treating coronary artery disease, concerns and uncertainties were raised. The most critical limitations are poor …
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Die endovaskuläre Behandlung von Karotisdissektionen mit Micromesh dual-layer Stents
… und Wirksamkeit von Micromesh-Dual-Layer-Stents bei Karotisdissektionen. Zwischen 2015 und 2021 wurden 11 Patienten mit Schlaganfall infolge einer Karotisdissektion erfolgreich interventionell behandelt. Alle Stentimplantationen verliefen komplikationslos, mit mindestens TICI 2b, bei 63,6 …
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2-D CFD design of the cross-sectional shape of arterial stents
An approach for desigining arterial stents to maximize wall shear stress is presented. A cost equation to maximize wall shear stress is derived and then inverted into a minimization problem for the optimizer. A 2-D mixed-element finite-volume scheme for solving the compressible Navier-Stokes …
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Biodegradable stents made of pure Mg and AZ91 alloy through SPS sintering
The implantation of stents is an effective procedure to unblock the arteries of patients with serious heart problems. Traditionally, stents are made of inert materials such as stainless steel and titanium alloys. It has been shown that the traditional stents can cause restenosis or thrombosis. In …
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Seeding of Titanium Surfaces and Nitinol Stents with Blood-Derived Endothelial Cells
… of blood-contacting cardiovascular implants (stents, ventricular assist devices) with functional endothelium may reduce the incidence of clotting and restenosis complications and also reduce the need for risky anticoagulation therapy following implantation of such devices. We developed a novel …
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Measurement dynamic strain induced by balloon-expandable endovascular stents in arterial walls
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Methods and Strategies for Evaluating MRI Rf-Induced Heating for Implanted Metallic Stents
… the general metallic implanted devices, however stents are not fully studied on its RF-induced heating behavior. In this work, evaluations of MRI RF-induced heating are carried out on implanted medical stents. Due to various designs of stents, several typical generic stent models are developed …
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Modeling and simulation of coronary stents: Intravascular drug delivery and arterial drug distribution
… in coronary arteries implanted with drug-eluting stents, with the maximum thickness observed at the vascular site of maximum inter-strut angle. This phenomenon may be related to the specific spatiotemporal drug uptake in the arterial wall. In this work local delivery of a hydrophobic drug from a …
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