在主动脉根的体外模型中经过生物假体瓣膜的三维流动结构

2019/08/05   下载量： 0 次

方案摘要

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应用领域 医疗/卫生
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司的两台八百万像素CCD相机，加让两块平面反射镜，构成一套等效四个视角的层析PIV测量系统并对在主动脉根的体外模型中经过生物假体瓣膜的三维流动结构进行了测量研究。

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    The flow field past a prosthetic aortic valve comprises many details that indicate whether the prosthesis is functioning well or not. It is, however, not yet fully understood how an optimal flow scenario would look, i.e. which subtleties of the fluid dynamics in place are essential regarding the durability and compatibility of a prosthetic valve. In this study, we measured and analyzed the 3D flow field in the vicinity of a bio-prosthetic heart valve in function of the aortic root size. The measurements were conducted within aortic root phantoms of different size, mounted in a custom-built hydraulic setup, which mimicked physiological flow conditions in the aorta. Tomographic particle image velocimetry was used to measure the 3D instantaneous velocity field at various instances. Several 3D fields (e.g. instantaneous and mean velocity, 3D shear rate) were analyzed and compared focusing on the impact of the aortic root size, but also in order to gain general insight in the 3D flow structure past the bioprosthetic valve. We found that the diameter of the aortic jet relative to the diameter of the ascending aorta is the most important parameter in determining the characteristics of the flow. A large aortic cross-section, relative to the cross-section of the aortic jet, was associated with higher levels of turbulence intensity and higher retrograde flow in the ascending aorta.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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