Literatura científica selecionada sobre o tema "Stent de déviation de flux"
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Artigos de revistas sobre o assunto "Stent de déviation de flux"
Guédon, A., E. Shotar, C. Thepenier, J. Gabrieli, C. Rolla-Bigliani, A. Nouet, V. Degos, N. Sourour e F. Clarençon. "Facteurs prédictifs d’occlusion anévrismale après pose d’un stent à diversion de flux". Journal of Neuroradiology 45, n.º 2 (março de 2018): 72. http://dx.doi.org/10.1016/j.neurad.2017.12.007.
Texto completo da fonteJanot, Kevin, Robert Fahed, Aymeric Rouchaud, Kevin Zuber, Géraud Forestier, Charbel Mounayer e Michel Piotin. "Le redressement de l’artère induit par un stent à diversion de flux influence l’occlusion anévrismale". Journal of Neuroradiology 46, n.º 2 (março de 2019): 69. http://dx.doi.org/10.1016/j.neurad.2019.01.063.
Texto completo da fontePivet, Sebastien, e Omer Eker. "TEMPORARY REMOVAL: REVUE DE LITTÉRATURE DES STENT À DIVERSION DE FLUX ET MODIFICATION DE SURFACE". Journal of Neuroradiology 51, n.º 2 (março de 2024): 126. http://dx.doi.org/10.1016/j.neurad.2024.01.067.
Texto completo da fonteBirapadian, Shiivaa Manjare, Seng Fai Tang, Chenshen Lam e Norshamsiah Md Din. "Improvement of optic nerve head perfusion and reversible visual field defect following XEN Gel Stent implant". Malaysian Journal of Ophthalmology 5, n.º 1 (6 de novembro de 2023): 1–6. http://dx.doi.org/10.35119/myjo.v5i1.274.
Texto completo da fonteZhang, J., A. Hopkins, P. J. Barnes, M. Cagnes, Y. Yonekura e Y. Fukui. "The Radio-FIR Correlation in the Milky Way". Publications of the Astronomical Society of Australia 27, n.º 3 (2010): 340–46. http://dx.doi.org/10.1071/as08072.
Texto completo da fontePapaxanthos, Jean, Federico Cagnazzo, François Louis Colmiche, Xavier Barreau, Florent Gariel, Jerome Berge, Cyril Dargazanli, Vincent Costalat e Gaultier Marnat. "Ticagrelor versus clopidogrel lors de l'embolisation d'anevrismes intra craniens non rompus par stent a diversion de flux". Journal of Neuroradiology 49, n.º 2 (março de 2022): 117–18. http://dx.doi.org/10.1016/j.neurad.2022.01.015.
Texto completo da fontePerdrix, Jean, Pascal Simon Heiniger e Thierry Fumeaux. "Maladie coronarienne stable et pose de stent : mesurer la réserve de flux coronarien pour mieux sélectionner les patients ?" Revue Médicale Suisse 8, n.º 354 (2012): 1797. http://dx.doi.org/10.53738/revmed.2012.8.354.1797.
Texto completo da fonteTessier, Guillaume, Romain Bourcier, Benjamin Daumas-Duport e Hubert Desal. "Traitement endovasculaire des anévrysmes larges et géants de la carotide interne: occlusion carotidienne ou stent de diversion de flux ?" Journal of Neuroradiology 49, n.º 2 (março de 2022): 139–40. http://dx.doi.org/10.1016/j.neurad.2022.01.043.
Texto completo da fonteCaroff, Jildaz, Anna Luisa Kühn, Katyucia De Macedo Rodrigues, David E. Rex, Robert M. King, Ajay K. Wakhloo, Miklos Marosfoi, Matthew J. Gounis e Ajit S. Puri. "L’angioplastie après la pose d’un stent à diversion de flux est une technique sûre pour améliorer les taux d’occlusion anévrismale". Journal of Neuroradiology 46, n.º 2 (março de 2019): 68. http://dx.doi.org/10.1016/j.neurad.2019.01.061.
Texto completo da fonteLabeyrie, Paul-Emile, Benjamin Gory, Udi Sadeh-Gonike, Nazyed Huguet, Rotem Sivan-Hoffmann, Roberto Riva, Patrick Courthéoux e Francis Turjman. "Early angiographic changes of intra-aneurysmal flow after flow-diverter stent treatment are not predictive of therapeutic success". Interventional Neuroradiology 22, n.º 6 (20 de agosto de 2016): 682–86. http://dx.doi.org/10.1177/1591019916662192.
Texto completo da fonteTeses / dissertações sobre o assunto "Stent de déviation de flux"
Charbonnier, Guillaume. "Evaluation des nouvelles techniques endovasculaires interventionnelles dans la prise en charge des pathologies neurovasculaires et leur impact sur le pronostic fonctionnel". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCE009.
Texto completo da fonteThe diagnostic and therapeutic management of stroke has changed radically in recent decades. Strategies for treating cerebral infarctions by intravenous recanalization of the artery were evaluated in the 1990s. In case of large vessel occlusion, recent neurointerventional techniques demonstrated great efficacy with mechanical thrombectomy. For many years, endovascular interventions have also made it possible to participate in the management of strokes such as aneurysmal subarachnoid hemorrhage. Historically treated exclusively by open neurosurgery, endovascular techniques using detachable coils have quickly exanded in this indication, in parallel with significant technical development. Many new medical devices have entered the market in particular to overcome challenging anatomies: remodeling balloons, intracranial stents. More recently, flow diversion stents and intra-saccular devices have positioned themselves as technological developments of previous procedures. These devices are now widely used for the treatment of acute ruptured aneurysms or elective treatments following the incidental discovery of risky lesions. 3D printing is a technological development that could make certain endovascular treatments safer. Digital subtracted angiographies make it possible to create patient-specific 3D models, allowing operators to train with different devices in order to better plan the future procedure. Finally, it seems necessary to evaluate cerebral reperfusion techniques within regional telestroke networks and the contribution of new robotic technologies in this field. Leader-follower robotic assistance is a tool that can improve operator comfort and exposure to ionizing radiation. Moreover, robotic control of catheters could improve the precision of procedures and ultimately patient safety. Finally, the system could allow remote operations, paving the way for teleprocedures controlled remotely by the expert operator, assisted by specialized technicians on site. The implementation of this technology, particularly concerning acute ischemia, could drastically reduce recanalization times and thus improve the functional prognosis of patients. Here we propose to address the problem of evaluating these devices by focusing on three recent technological developments: innovative intracranial devices for treating aneurysms (flow diverters and intrasacular stents), preoperative 3D printing and endovascular robotics
Iosif, Christina. "La compétition de flux comme facteur prédictif de la perméabilité des branches artérielles collatérales après mise en place des stents de diversion de flux dans les artères intracrâniennes". Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0002/document.
Texto completo da fonteThe outcome of jailing arterial branches that emerge near intracranial aneurysms during flow-diverting stent deployment remains controversial. We report an animal research study aiming to elucidate the role of collateral supply in the hemodynamic changes and neointimal modifications resulting from jailing arteries with flow-diverting stents. To serve this purpose, we sought to quantify the hemodynamic changes at the jailed arterial branches immediately after stenting, as well as quantify the ostia surface values at three months post-stenting, in the presence or absence of collateral arterial flow. Methods After a priori power analysis, two groups (A, B), each containing seven large white swine, were created according to an animal flow model for terminal and anastomotic arterial circulation. Group A corresponded to an arterial configuration with anastomotic type of arterial supply for the territory of the right Ascending Pharyngeal artery (APhA) and group B to an arterial configuration of terminal type of arterial supply for the territory of the right APhA. Subsequently, all animals were stented by flow-diverting stents, jailing the right ascending pharyngeal arteries. Mean flow rates and velocities inside the jailed branches were quantified before and after stenting by time-resolved, 3D, phase contrast MRA. After three months the jailed ostia surface values were quantified on scanning electron microscopic images. The data were analyzed using descriptive statistics and group comparisons with parametric and non-parametric tests.Results Endovascular procedures were feasible, without in situ thrombus formation or ischemic DWI findings on post-procedure MRIs. Immediately following stenting, mean flow rate values at the jailed right ascending pharyngeal arteries were reduced in group A, as compared to the pre-stenting values [P = 0.0008, power: 0.9548]. In contrast, mean flow rates for group B remained similar to the pre-stenting values. At three months post-stenting, mean ostia surface values were significantly higher for group B (527,911 ± 306,229 μm2) than for group A (89,329 ± 59,762 μm2) [P< 0.01, power: 1.00], even though the initial dimensions of the jailed ostia were similar between groups. A statistically significant correlation was found between group (A or B), mean flow rates post-stenting and ostia surface values at three months. ConclusionWhen important collateral supply was present, jailing side arteries with flow-diverters resulted in an immediate, significant reduction in flow rate inside these arteries, as compared to the pre-stenting values. In contrast, when competitive flow was absent, jailing did not result in significant flow rate reductions inside the jailed arteries. Ostium surface values at three months were significantly higher in the terminal group of jailed arteries, compared to the anastomotic group and strongly correlated with the velocity value reductions post- stenting. Key words: flow-diverting stent, collateral arteries, endothelialization, ostium, embolization, magnetic resonance angiography, magnetic resonance imaging
El, Ammouri Fouad. "Etude théorique des transferts couplés conductif, convectif et radiatif dans des écoulements gazeux hétérogènes et turbulents : mesure du flux conductif par déviation de faisceau laser". Châtenay-Malabry, Ecole centrale de Paris, 1993. http://www.theses.fr/1993ECAP0310.
Texto completo da fonteBresson, Damien. "Étude de l’écoulement sanguin dans un anévrysme intracrânien avant et après traitement par stent flow diverter : quantification par traitement d’images de séquences angiographiques 2D". Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2308/document.
Texto completo da fonteIntracranial aneurysms treatment based on intra aneurismal flow modification tend to replace traditionally coiling in many cases and not only complex aneurysms for which they were initially designed. Dedicated stents (low porosity, high pores density stents) called “flow diverter” stents are deployed across the neck of the aneurysm to achieve this purpose. The summation of three different mechanisms tend to lead to the healing of the aneurysm: immediate flow alteration due to the mechanical screen effect of the stent, physiological triggering of acute or progressive thrombus formation inside the aneurysm’s pouch and long term biological response leading in neointima formation and arterial wall remodeling. This underlying sequence of processes is also supposed to decrease the recanalization rate. Scientific data supporting the flow alteration theory are numerous and especially computational flow dynamics (CFD). These approaches are very helpful for improving biomechanical knowledge of the relations between blood flow and pathology, but they do not fit in real-time treatments. Neuroendovascular treatments are performed under dynamic x-ray modality (digital subtracted angiography a DSA-).However, in daily practice, FD stents are sized to the patient’s 3D vasculature anatomy and then deployed. The flow modification is then evaluated by the clinician in an intuitive manner: the decision to deploy or not another stent is based solely on a visual estimation. The lack of tools available in the angioroom for quantifying in real time the blood flow hemodynamics should be pointed out. It would make sense to take advantage of functional data contained in contrast bolus propagation and not only anatomical data. Thus, we proposed to create flow software based on angiographic analysis. This software was built using algorithms developed and validated on 2D-DSA sequences obtained in a swine intracranial aneurysm model. This intracranial animal model was also optimized to obtain 3D vascular imaging and experimental hemodynamic data that could be used to realize realistic computational flow dynamic. In a third step, the software tool was used to analyze flow modification from angiographic sequences acquired during unruptured IA from patients treated with a FD stent. Finally, correlation between flow change and aneurysm occlusion at long term follow-up with the objective of identifying predictive markers of long term occlusion was performed
Eker, Omer Faruk. "Impact de l'anévrisme intracrânien sur l'hémodynamique de l'artère porteuse : de l’observation in vitro à l’exploration in vivo". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1046/document.
Texto completo da fonteIntracranial aneurysms are the most common lethal predisposition amongst young adults. Its understanding remains limited to date while the development of new innovative endovascular treatments are increasingly available and allow for the treatment of more and more complex aneurysms with a non negligeable rate of complications. Most of the previous studies on intracranial aneurysms are based on low informative clinical series and the use of limited numerical simulation methods. They almost exclusively target the intrasaccular mechanical phenomena irrespective of the changes in the parent vessel induced by the aneurysm. In vitro, the use of silicone aneurysms embedded in a cardiovascular simulator showed an impact of the aneurysm on the the parent vessel flow conditions characterized by a decrease of its resistance. In vivo, flow MRI allowed to quantify this effect by analyzing the volumetric flow rate curves. Downstream to the aneurysm, the blood flow was dampened and presents a systolic diastolic demodulation with a collapse of resistive and pulsatility indexes. This effect was strongly correlated to the aneurysm volume. The flow diverter stents allowed for a measurable « hemodynamic reconstruction » of the parent vessel by restoring a normo modulated flow, and normal resistive and pulsatility indexes. An original method for the segmentation of internal carotid artery in 2D phase contrast MRI was proposed. It is based on the application of the Fourier Transform on the phase images and by taking into account the temporal coherence of velocities within the voxel. The method was characterized and compared to two reference methods
Hamdan, Sadeque. "Optimization Models for Air Traffic Flow Management". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST042.
Texto completo da fonteDelays and emissions are critical topics in the aviation industry. The major delay sources are imbalanced demand and capacity, air traffic controller staffing, and severe weather conditions. In some cases, flights can choose to fly at a higher speed than the scheduled one, which increases emissions. Moreover, several projects have been initiated to improve information sharing, and consequently, decision making in order to benefit all aviation parties and reduce delays and emissions.In this Ph.D. thesis, we aim at studying the air traffic flow management (ATFM) problem from an operations research/operations management perspective. We study the ATFM model, a widely used model in the literature, and analyze it. We correct the formulation deficiencies, and we extend the network design and the considered features to reach a better representation of the real-life network. In this extension, we consider several types of flights and several decision options, such as changing the path or the landing airport. The objectives of this research can be summarized in the following points.(1) To study the impact of centralizing the decision-making process in the ATFM problem compared to the current situation where decisions by ATFM authority and airlines are made independently.(2) To analyze the inter-flight and inter-airline fairness in the ATFM problem.(3) To construct a weather-capacity model for airports and develop scenario trees for stochastic ATFM networks based on real data.(4) To integrate dynamic airspace configuration in the ATFM problem and to analyze the impact.(5) To account for CO2 emissions and different fuel types in the ATFM.Therefore, we develop several extensions to the ATFM model to accommodate these issues. First, we propose a deterministic ATFM model that centralizes the decisions of the ATFM authority and the airlines, and that considers different rerouting options. Then, we formulate a stochastic ATFM model that accounts for airports' weather uncertainties. The weather-capacity relationship and the stochastic scenario trees are developed using meteorological aerodrome reports, the AirportCorner database, and the k-means clustering technique. After that, we focus on optimizing the airspace configuration simultaneously with the ATFM problem by minimizing the total unused airspace capacity and the total network cost. Finally, we integrate the CO2 emissions in the ATFM model through a bi-objective optimization approach. The model is used to study the CO2 emissions' impact on the network's cost and the effect of fuel type on the network decisions. The developed models are solved using the exact approach, and in the case of long computational times, a fix-and-relax heuristic is used.The proposed models can help decision-makers through analyzing the impact of the decisions to be made on the network and the stakeholders involved. Therefore, the consequences and the associated costs can be calculated. In addition, these models help decision-makers fine-tune and verify findings of several ATFM projects and initiatives. They also suggest to decision makers how flight plans can be updated in cases of network disturbance and the associated costs of the changes
Trabalhos de conferências sobre o assunto "Stent de déviation de flux"
Baranes, M., e T. Fortin. "Planification et chirurgie guidée - Avis d’experts : Apports des nouvelles technologies en implantologie : de la planification à la réalisation de la prothèse provisoire immédiate". In 66ème Congrès de la SFCO. Les Ulis, France: EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206601011.
Texto completo da fonte