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Statements

Subject Item
n2:RIV%2F61388998%3A_____%2F14%3A00429396%21RIV15-GA0-61388998
rdf:type
skos:Concept n14:Vysledek
dcterms:description
Self-expanding stents or stentgrafts made from Nitinol superelastic alloy are widely used for a less invasive treatment of disease-induced localized flow constriction in the cardiovascular system. The therapy is based on insertion of a stent into a blood vessel to maintain the inner diameter of the vessel; it provides highly effective results at minimal cost and with reduced hospital stays. However, since stent is an external mechanical healing tool implemented into human body for quite a long time, information on the mechanical performance of it is of fundamental importance with respect to patient_s safety and comfort. Advantageously, computational structural analysis can provide valuable information on the response of the product in an environment where in vivo experimentation is extremely expensive or impossible. With this motivation, a numerical model of a particular braided self-expanding stent was developed. As a reasonable approximation substantially reducing computational demands, the stent was considered to be composed of a set of helical springs with specific constrains reflecting geometry of the structure. An advanced constitutive model for NiTi-based shape memory alloys including R-phase transition was employed in analysis. Comparison to measurements shows a very good match between the numerical solution and experimental results. Relation between diameter of the stent and uniform radial pressure on its surface is estimated. Information about internal phase and stress state of the material during compression loading provided by the model is used to estimate fatigue properties of the stent during cyclic loading. Self-expanding stents or stentgrafts made from Nitinol superelastic alloy are widely used for a less invasive treatment of disease-induced localized flow constriction in the cardiovascular system. The therapy is based on insertion of a stent into a blood vessel to maintain the inner diameter of the vessel; it provides highly effective results at minimal cost and with reduced hospital stays. However, since stent is an external mechanical healing tool implemented into human body for quite a long time, information on the mechanical performance of it is of fundamental importance with respect to patient_s safety and comfort. Advantageously, computational structural analysis can provide valuable information on the response of the product in an environment where in vivo experimentation is extremely expensive or impossible. With this motivation, a numerical model of a particular braided self-expanding stent was developed. As a reasonable approximation substantially reducing computational demands, the stent was considered to be composed of a set of helical springs with specific constrains reflecting geometry of the structure. An advanced constitutive model for NiTi-based shape memory alloys including R-phase transition was employed in analysis. Comparison to measurements shows a very good match between the numerical solution and experimental results. Relation between diameter of the stent and uniform radial pressure on its surface is estimated. Information about internal phase and stress state of the material during compression loading provided by the model is used to estimate fatigue properties of the stent during cyclic loading.
dcterms:title
Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase
skos:prefLabel
Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase Simulations of Self-Expanding Braided Stent Using Macroscopic Model of NiTi Shape Memory Alloys Covering R-Phase
skos:notation
RIV/61388998:_____/14:00429396!RIV15-GA0-61388998
n4:aktivita
n13:P n13:I
n4:aktivity
I, P(GA13-13616S), P(GA14-15264S), P(GP14-28306P)
n4:cisloPeriodika
7
n4:dodaniDat
n5:2015
n4:domaciTvurceVysledku
n11:6235638 n11:3319830 n11:2391147 n11:5382165
n4:druhVysledku
n12:J
n4:duvernostUdaju
n9:S
n4:entitaPredkladatele
n10:predkladatel
n4:idSjednocenehoVysledku
45027
n4:idVysledku
RIV/61388998:_____/14:00429396
n4:jazykVysledku
n15:eng
n4:klicovaSlova
braided stent; numerical simulation; R-phase; shape memory alloys
n4:klicoveSlovo
n6:R-phase n6:numerical%20simulation n6:shape%20memory%20alloys n6:braided%20stent
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[5B2DF1DAB480]
n4:nazevZdroje
Journal of Materials Engineering and Performance
n4:obor
n18:BM
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
4
n4:projekt
n7:GA13-13616S n7:GA14-15264S n7:GP14-28306P
n4:rokUplatneniVysledku
n5:2014
n4:svazekPeriodika
23
n4:tvurceVysledku
Frost, Miroslav Landa, Michal Kruisová, Alena Sedlák, Petr
n4:wos
000339010700044
s:issn
1059-9495
s:numberOfPages
7
n17:doi
10.1007/s11665-014-0966-z