What can we Learn from Explanted Endovascular Devices?

Riepe, G.; Heintz, C.; Kaiser, E.; Chakfé, Nabil; Morlock, Michael M.; Delling, M.; Imig, H.

doi:10.1053/ejvs.2002.1677

Cited by 99 publications

(49 citation statements)

References 14 publications

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“…Although there were no material failures with the handmade SGs during the follow-up period, material failures in commercially available SGs have been reported. [52][53][54][55] It is possible that the currently available handmade SGs, which are constructed from a stainless steel stent welded using solder and covered by a hand-sutured ultrathin woven fabric, may show material failure in the long term. In addition, the possibility of endoleak and/or migration in the future cannot be ruled out because the number of patients in this study was small and the follow-up period was short.…”

Section: Discussionmentioning

confidence: 99%

Initial and Midterm Results for Repair of Aortic Diseases With Handmade Stent Grafts

Onitsuka

Tanaka

Akashi

et al. 2006

Circ J

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Section: Discussionmentioning

confidence: 99%

Initial and Midterm Results for Repair of Aortic Diseases With Handmade Stent Grafts

Onitsuka

Tanaka

Akashi

et al. 2006

Circ J

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“…However, there is a dearth of information in the literature regarding those responses and properties in a product form that is relevant to biomedical devices: Nitinol tube. Motivated by the cited failures of many hundreds of stents in vivo [78][79][80][81][82][83][84][85][86][87][88][89], as well as personal experience with investigation of failed biomedical devices, it is the primary goal of this research to determine the fracture and fatigue properties, and the relevant microstructural variables, that influence the failure of Nitinol tube.…”

Section: Objective Of This Workmentioning

confidence: 99%

On the Mechanical Properties and Microstructure of Nitinol forBiomedical Stent Applications

Robertson

2006

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This dissertation was motivated by the alarming number of biomedical device failures reported in the literature, coupled with the growing trend towards the use of Nitinol for endovascular stents. The research is aimed at addressing two of the primary failure modes in Nitinol endovascular stents: fatigue-crack growth and overload fracture. The small dimensions of stents, coupled with their complex geometries and variability among manufacturers, make it virtually impossible to determine generic material constants associated with specific devices. Instead, the research utilizes a hybrid of standard test techniques (fracture mechanics and x -ray micro-diffraction) and custom-designed testing apparatus for the determination of the fracture properties of specimens that are suitable representations of self-expanding Nitinol stents.Specifically, the role of texture (crystallographic alignment of atoms) and the austenite-to-martensite phase transformation on the propagation of cracks in Nitinol was evaluated under simulated 2 body conditions and over a multitude of stresses and strains. The results determined through this research were then used to create conservative safe operating and inspection criteria to be used by the biomedical community for the determination of specific device vulnerability to failure by fracture and/or fatigue.Professor Robert O. Ritchie Dissertation Committee Chair

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“…Além disso, possui grande elasticidade e resistência à fratura. Nitinol é a sigla de Nickel Titanium Naval Ordinance Laboratories, cuja liga metálica foi inicialmente desenvolvida para fins militares 18 A fratura de stents de nitinol pode estar relacionada ao polimento e ao revestimento da superfície do stent com óxidos amorfos 19,20 .…”

Section: Introductionunclassified

Atualização sobre endopróteses vasculares (stents): dos estudos experimentais à prática clínica

França

Pereira

2008

J. vasc. bras.

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ResumoAtualmente, o tratamento das doenças vasculares periféricas é uma das áreas da medicina de maior expansão. O número de intervenções vasculares aumenta e os resultados das novas técnicas endovasculares estão muito próximos aos das tradicionais cirurgias vasculares. Embora a angioplastia ofereça bons resultados em curto prazo, o implante de stents procura melhorar o sucesso do procedimento e estender o seu uso a um número maior de pacientes com doença vascular periférica. Entretanto, a sua utilização ainda é controversa. O implante de stents no sistema aorto-ilíaco tem bons resultados; porém, a sua indicação para as lesões femoro-poplíteas ainda é discutida. Além disso, o rápido desenvolvimento de stents e sua escolha para uso no sistema vascular periférico têm sido uma difícil tarefa para o cirurgião endovascular. Muitos fatores influenciam a escolha do stent, e um amplo conhecimento desse material é essencial. Tal escolha depende da avaliação pré-operatória, da localização e das características da lesão e também do uso do stent primário ou seletivo. Nesse trabalho, são realizadas revisão do histórico do desenvolvimento dos stents, desde os estudos experimentais até os ensaios clínicos e também discussão sobre a sua aplicação no tratamento das doenças vasculares periféricas.Palavras-chave: Artéria, prótese vascular, doenças vasculares periféricas. AbstractThe treatment of peripheral vascular diseases is one of the most rapidly expanding fields of medicine today. The number of peripheral interventions increased and innovative endovascular techniques are close to the results of traditional vascular surgeries. Although balloon angioplasty alone offers good immediate results, implantation of stents has been proposed to improve the procedural success and extend its application to more patients with peripheral vascular disease. However, stenting is controversial. Use of stents has good results in aortoiliac vessels, but its use in femoropopliteal vessels is still in dispute. Moreover, the rapid development of endovascular stents for peripheral applications and their choice have been a complicated task for endovascular surgeons. Many factors influence choice of stent, therefore, knowledge of available stents is mandatory. Appropriate selection depends on adequate preprocedural evaluation of the lesion, choice of primary vs. selective stent placement, and location and characteristics of the lesion. In this article the history of stent development is reviewed, from studies with experimental models to clinical practice, and its application in the treatment of peripheral vascular diseases is discussed.Keywords: Artery, vascular graft, peripheral vascular diseases. IntroduçãoStents são estruturas tubulares metálicas, em forma de malha, inseridas na luz vascular, cuja função é manter o lúmen arterial aberto (por meio de pressão mecâ-nica) e evitar as reestenoses decorrentes do desenvolvimento da hiperplasia intimal ou da contração resultante do tratamento de lesões fibroelásticas 1 .O termo "stent" vem do epônimo Charle...

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What can we Learn from Explanted Endovascular Devices?

Cited by 99 publications

References 14 publications

Initial and Midterm Results for Repair of Aortic Diseases With Handmade Stent Grafts

Initial and Midterm Results for Repair of Aortic Diseases With Handmade Stent Grafts

On the Mechanical Properties and Microstructure of Nitinol forBiomedical Stent Applications

Atualização sobre endopróteses vasculares (stents): dos estudos experimentais à prática clínica

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