S0220204 ステントのバルーン形状が偏心性プラーク変形に与える影響([S022-02]循環器系医療機器セッション(2),バイオエンジニアリング部門)

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  • S0220204 Effect of balloon shape in treatment of eccentric plaque considering the changes in stent surface roughness

抄録

The changes in physical surface condition after expansion of balloon expandable stent are known as the primary cause of some serious problem following narrowed arteries treatment. The shape of a balloon in the treatment of eccentric plaque, which is majority form of plaque, is hypothesized influencing stent surface roughness. In this paper, the influence of the balloon shape on the changes in surface roughness will be observed using finite element method. Transient nonlinear structural analyses of eccentric plaque are built to identify the deformation. General-purpose software of finite element method such as ANSYS is used for the structural analyses. Material properties utilized in the simulation are 316 stainless steel for the stent; polyethylene terephthalate (PET) for the balloon; hypo cellular for the plaque; and carotid artery for the vessel wall. 3D symmetrical model will be developed in order to reduce computational time. Type Palmaz stent is determined for modeling in the structural analysis. Type cylindrical and offset balloon shape is chosen in the analysis, which one gives better treatment for eccentric plaque. The eccentric plaque is designed having a slight longer length than the stent, which is covering almost 75% blood vessel hole so that covers in one side of vessel wall surface and another side is allowed free from plaque disruption. The material models are defined as multilinear isotropic for stent and hyperelastic for the balloon, plaque, and arterial wall. The finite element analysis indicated that offset balloon shape succeeds to reduce stress intensity area on the vessel wall and helps to improve foreshortening and dogboning effects. Nevertheless, several structural developments of Palmaz stent should be conducted to adapt the expansion direction of offset balloon because its directional expansion also increase plastic deformation of another stent struts.

収録刊行物

  • 年次大会

    年次大会 2014 (0), _S0220204--_S0220204-, 2014

    一般社団法人 日本機械学会

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