48 KB2663 KB42 KB199920252008Inoue, KatsumiNarita, YukuhitoYoshino, Daisuke15 straniletnik:54številka:6str. 471-485ISSN:0039-2480COBISSID:10703643URN:URN:NBN:SI:doc-0OENXPWFenAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnik3D CAD sistemibiomehanikametode končnih elementovmodeliranjestentUnderstanding the mechanical properties of self-expandable stents| a key to successful product development|A medical device of mesh-shaped tubular structure called stent is frequently used to expand the constric-tion of a blood vessel. The stent normally has thestructure of longitudinal repetition of wavy wire parts and strut parts, and its mechanical properties such as bending flexibility and rigidity in radial direction mainly depend on the shape of wavy wire and construction of the strut. In the first stage of this paper, the mechanical properties of self-expandable stents are evaluated using a non-linear finite element method.The initial stent models are gener-ated in a 3D-CAD system, and their expanded shapes are predicted first. They form the finite elements for the evaluation of the mechanical properties, then the influences of stent shape onthe mechanical properties are com-puted and discussed. In the second stage, a basic method for the selection of a stent is proposed from a view point of mechanics. This enables us to select useful stents that are well adapted to a patient's condition, though medical examination is necessaryStent je mrežasta cevka, ki se v zdravstvu pogosto uporablja za razširitev zoženih krvnih žil. Stent je običajno narejen iz zaporednih vzdolžnih valovitih žičnatih delov in opornih vezi. Njegove mehanske lastnosti, kot so pregibna prilagodljivosti in togost v radialni smeri, so večinoma odvisne od oblike valovite žice in od konstrukcije opornih vezi. V prvem delu prispevka vrednotimo mehanske lastnosti samorazteznih stentov s pomočjo metode nelinearnih končnih elementov. Prvi modeli stentov so nastali s pomočjo 3D-CAD sistema. Najprej smo simulirali njihovo obliko v raztegljivem stanju in dobili končne elemente za vrednotenje mehanskih lastnosti. Nato smo s pomočjo računalnika ugotavljali in komentirali vpliv oblike stenta na njegove mehanske lastnosti. V drugem koraku predlagamo osnovno metodo za izbiro stenta z vidika mehanike. To nam omogoča, da izberemo uporabne stente, ki se dobro prilagajajo stanju pacienta, čeprav je se vedno potreben zdravniški pregledTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo