患者固有の中大脳動脈モデルにおける流れの不安定性と壁せん断応力に対する壁弾性の影響

抄録

The purpose of this study is to experimentally investigate the effect of wall deformation on flow behavior using a cerebral aneurysm model that considers patient-specific elastic deformation. Therefore, we measured by two-dimensional PIV and compared the time-series change of flow velocity and wall shear stress (WSS) under the condition of deformation of the model and the condition of less-deformation. The model used in this study was fabricated by the dipping method and is made of silicon. Imaging was performed using a high-speed camera and a UV laser. WSS was calculated from the wall-parallel velocity component at a distance of 0.25 mm from the aneurysm wall. As a result, turbulence of the flow velocity between cycles was observed under both less-deformation and deformed conditions, confirming the instability of the flow. In addition, the wall shear stress was smaller under deformation conditions than under less-deformation conditions, suggesting that the elastic deformation of the aneurysm wall reduces the wall shear stress.