Filters








147 Hits in 3.5 sec

Geometrical deployment for braided stent

Pierre Bouillot, Olivier Brina, Rafik Ouared, Hasan Yilmaz, Mohamed Farhat, Gorislav Erceg, Karl-Olof Lovblad, Maria Isabel Vargas, Zsolt Kulcsar, Vitor Mendes Pereira
2016 Medical Image Analysis  
In this paper, a deployment model was developed based on geometrical properties of braided stents.  ...  The prediction of flow diverter stent (FDS) implantation for the treatment of intracranial aneurysms (IAs) is being increasingly required for hemodynamic simulations and procedural planning.  ...  Baer for the pictures of the in-vitro stent implantations.  ... 
doi:10.1016/j.media.2016.01.006 pmid:26891065 fatcat:wbdljvnhovh7jdmbdsxxpajtpm

Interaction between Flow Diverter and Parent Artery of Intracranial Aneurysm: A Computational Study

Wenyu Fu, Qixiao Xia
2017 Applied Bionics and Biomechanics  
To evaluate the influence of deployment strategy on the mechanical interaction between braided stent and parent artery of intracranial aneurysm (the elasticity of the arterial wall is considered), finite-element  ...  Two implantation strategies are used to virtually implant the braided stent into the ideal intracranial aneurysm model.  ...  Researchers use geometrical projection method for virtual stent deployment into intracranial arteries [5] [6] [7] [8] .  ... 
doi:10.1155/2017/3751202 pmid:29209136 pmcid:PMC5676342 fatcat:ykftqe3ufnetjna7qji3nvjx5e

Predicting flow diverter sizing using the AneuGuideTM software: a validation study

Xin Tong, Yejie Shan, Xiaochang Leng, Jigang Chen, Jens Fiehler, Adnan H Siddiqui, Xuebin Hu, Aihua Liu, Jianping Xiang
2022 Journal of NeuroInterventional Surgery  
BackgroundStent sizing remains a challenging task for flow diverter implantation because of stent foreshortening.  ...  Stent elongation was defined as the ratio of ML-LL to the labeled length (LL). Simulation error was defined as the ratio of the absolute value of CL-ML to ML.  ...  The geometrical deployment method, involving only geometrical calculations, has great prospects for clinical application.  ... 
doi:10.1136/neurintsurg-2021-018353 fatcat:3vy6xwst7rgjxfpoaf27j2zx7u

NITINOL STENTS

SAJJAD HUSSAIN, QAISER KHAN
2011 The Professional Medical Journal  
Objectives: To evaluate the geometric changes in the carotid arteries after deployment of self expanding nitinol stents. Settings: AFIC-NIHD. Period: November 2003 to August 2008.  ...  that had pre and post stenting images in the same imaging projection were available for analysis.  ...  Objectives: To evaluate the geometric changes in the carotid arteries after deployment of self expanding nitinol stents. Settings: AFIC-NIHD. Period: November 2003 to August 2008.  ... 
doi:10.29309/tpmj/2011.18.04.2657 fatcat:w37zncbgfvgbbcboma6vxrrey4

The Geometry of Y-stent Configurations Used for Wide-Necked Aneurysm Treatment: Analyzing Double-Barrel Stents in vitro Using Flat-Panel CT

M. Travis Caton, Alexander Z. Copelan, Kazim H. Narsinh, Amanda Baker, Adib A. Abla, Randall T. Higashida, Matthew R. Amans, Steven W. Hetts, Daniel L. Cooke
2021 World Neurosurgery  
In a silicone model of a wide-necked basilar tip aneurysm, six simulated KDB stent deployment trials were performed using combinations of five stents (Enterprise 1, 2, Neuroform Atlas, LVIS, LVIS Jr.).  ...  Several distinct forms of cross-sectional stent geometry were observed. Braided stents had lower ovalization and D-ratio (p = 0.015) than laser-cut stents.  ...  KDB stent deployment.  ... 
doi:10.1016/j.wneu.2021.04.042 pmid:33887500 fatcat:pajkyh3bordxffreuk3chlat3u

Deformation Mechanics of Self-expanding Venous Stents: Modelling and Experiments [article]

Masoud Hejazi, Farrokh Sassani, Joel Gagnon, York Hsiang, Srikantha Phani
2021 arXiv   pre-print
Their suitability for deployment in different clinical contexts is assessed based on their deformation characteristics.  ...  Braided design applies a larger radial pressure particularly for vessels of diameter smaller than 75% of its nominal diameter, making it suitable for a long lesion with high recoil.  ...  Acknowledgment We sincerely acknowledge the Division of Vascular Surgery at Vancouver General Hospital for providing the stent models.  ... 
arXiv:2102.10219v1 fatcat:b756xococbdc3mzlwp754mxsq4

High Fidelity Virtual Stenting (HiFiVS) for Intracranial Aneurysm Flow Diversion: In Vitro and In Silico

Ding Ma, Travis M. Dumont, Hiroyuki Kosukegawa, Makoto Ohta, Xinjian Yang, Adnan H. Siddiqui, Hui Meng
2013 Annals of Biomedical Engineering  
A flow diverter (FD) is a flexible, densely braided stent-mesh device placed endoluminally across an intracranial aneurysm to induce its thrombotic occlusion.  ...  We have recently developed a High Fidelity Virtual Stenting (HiFiVS) technique based on finite element analysis to simulate detailed FD deployment processes in patient-specific aneurysms (Ma et al.  ...  We determined the braiding angle at labeled state by assuming 30% metal coverage rate (a general design objective for FD) based on standard geometrical equations. 5,10, 15 We then calculated the FD geometry  ... 
doi:10.1007/s10439-013-0808-4 pmid:23604850 pmcid:PMC3766425 fatcat:ib4hmjrmn5h6tkt2t6rl3tczdm

A novel virtual flow diverter implantation method with realistic deployment mechanics and validated force response

Gábor Závodszky, Benjámin Csippa, György Paál, István Szikora
2020 International Journal for Numerical Methods in Biomedical Engineering  
The mechanics of the model allows to replicate the expansion process during deployment, including additional effects such as the push-pull technique that is required for the deployment of braided FD-s  ...  The structure of the virtual braids naturally incorporates the axial length changes as a function of the local expansion diameter.  ...  ACKNOWLEDGEMENTS The authors would like to thank for the help and support of Eszter Bognár and Péter Nagy with the mechanical tensile test measurements of the FDs.  ... 
doi:10.1002/cnm.3340 pmid:32279440 fatcat:3v5n7p7q7bg2jmttpmbjqtdtou

Conformity of carotid stents with vascular anatomy: evaluation in carotid models

Norimitsu Tanaka, Jean-Baptiste Martin, Koji Tokunaga, Toshi Abe, Yusuke Uchiyama, Naofumi Hayabuchi, Joachim Berkefeld, Daniel A Rüfenacht
2004 American Journal of Neuroradiology  
Implantation of braided Wallstents or the Expander with continuous filaments induced considerable straightening effects on the bifurcation angle, as well as on the curves of the internal carotid artery  ...  Segmented designs of modular nitinol stents complied better with vascular tortuosity and showed improved adaption between stent and the endoluminal surface of the model.  ...  All stents had the same nominal diameter of 8 mm and a length of 60 mm after deployment.  ... 
pmid:15090350 pmcid:PMC7975609 fatcat:7es2utzlmnfhrpr4dot7fywmpm

Towards real-time cardiovascular magnetic resonance-guided transarterial aortic valve implantation: In vitro evaluation and modification of existing devices

Philipp Kahlert, Holger Eggebrecht, Björn Plicht, Oliver Kraff, Ian McDougall, Brad Decker, Raimund Erbel, Mark E Ladd, Harald H Quick
2010 Journal of Cardiovascular Magnetic Resonance  
Reliable flow measurements could be performed for both stent-valves after deployment using phase-contrast sequences.  ...  Results: CMR revealed major susceptibility artifacts for the two commercial delivery devices caused by considerable metal braiding and precluding in vivo application.  ...  the mounted stent-valve could be visualized artifact-free and allowed for precise valve positioning and deployment without image distortion at the region of interest.  ... 
doi:10.1186/1532-429x-12-58 pmid:20942968 pmcid:PMC2964701 fatcat:r22zhzzbkrcuffrhiu5n2o452a

Structural Design of Vascular Stents: A Review

Chen Pan, Yafeng Han, Jiping Lu
2021 Micromachines  
In this paper, we introduce the evolution, performance evaluation standards, delivery and deployment, and manufacturing methods of vascular stents.  ...  Percutaneous Coronary Intervention (PCI) is currently the most conventional and effective method for clinically treating cardiovascular diseases such as atherosclerosis.  ...  The authors thank Gao Ge for his help in language polish and editing support, who is the Assistant Professor of BIT (China) Institute of Eng. Med.  ... 
doi:10.3390/mi12070770 fatcat:fhfqim3aqvhzdbogfo4nltwwcm

Coronary stent concertina in proximal left anterior descending artery: An unusual case

Shivanand Patil, Natraj Setty, Rangaraj Ramalingam, Jayashree Kharge, Cholenahally Nanjappa Manjunath
2017 Interventional Medicine & Applied Science  
It is an abrupt shortening of the stent along its longitudinal axis, usually after deployment, due to various reasons.  ...  Since the emergence of stents, there has been persistent improvement in flexibility and deliverability of stents with modifications in its design and number of connectors.  ...  system after stent deployment, crossing of new stent through the deployed stent for the treatment of a distal lesion, and wire entanglement [1, [5] [6] [7] .  ... 
doi:10.1556/1646.9.2017.2.19 pmid:28932506 pmcid:PMC5598132 fatcat:lvz7gzzbefdnrarfl7c2odobze

Coronary stent concertina in proximal left anterior descending artery: An unusual case

Shivanand Patil, Natraj Setty, Rangaraj Ramalingam, Jayashree Kharge, Cholenahally Nanjappa Manjunath
2017 Interventional Medicine & Applied Science  
It is an abrupt shortening of the stent along its longitudinal axis, usually after deployment, due to various reasons.  ...  Since the emergence of stents, there has been persistent improvement in flexibility and deliverability of stents with modifications in its design and number of connectors.  ...  system after stent deployment, crossing of new stent through the deployed stent for the treatment of a distal lesion, and wire entanglement [1, [5] [6] [7] .  ... 
doi:10.1556/1646.9.2017.19 fatcat:flrkikujz5bxfmw473fqagccum

On Studying the Interaction Between Different Stent Models and Rabbit Tracheal Tissue: Numerical, Endoscopic and Histological Comparison

J. Chaure, C. Serrano, R. Fernández-Parra, E. Peña, F. Lostalé, M. A. De Gregorio, M. A. Martínez, M. Malvè
2015 Annals of Biomedical Engineering  
under geometrical point of view. 93 The human trachea, for instance, is proportionally shorter with respect to the rabbit trachea.  ...  This analysis was performed mainly for the Palmaz stent 57 in rabbits 7 , lambs 30 and pigs 31 , and for Gianturco stent in dogs 32,33 .  ...  same simulation after stent deployment.  ... 
doi:10.1007/s10439-015-1504-3 pmid:26589598 fatcat:rozyqfohhrbw7ep3sjhibtwgwu

Endovascular stenting for carotid artery stenosis: preliminary experience using the shape-memory- alloy-recoverable-technology (SMART) stent

C C Phatouros, R T Higashida, A M Malek, P M Meyers, T E Lempert, C F Dowd, V V Halbach
2000 American Journal of Neuroradiology  
Excellent performance of the SMART stent for the endovascular treatment of carotid artery stenosis has been shown based on our early experience.  ...  The specific technical characteristics, potential advantages, and disadvantages of this stent are discussed and compared with other currently used carotid artery stents.  ...  This segmented geometrical design results in individual stent hoops behaving fairly independently of each other. The Wallstent possesses a braided geometry in a tubular mesh configuration.  ... 
pmid:10782787 pmcid:PMC7976650 fatcat:nksviwmh7zc7zgjwnvacq2k2we
« Previous Showing results 1 — 15 out of 147 results