Tonietto G, Cassot F, Rieu R, Garitey V, Pelissier R
Institut de Mécanique des Fluides de Marseille, UM. 34 C.N.R.S., France.
Int J Artif Organs. 1992 May;15(5):295-300.
Using a cardiovascular simulator to duplicate in vitro the flow conditions through valves in aortic position, bidimensional velocity maps very near the valve are reconstructed, from an ultrasonic 8 Mhz doppler system, in an elastic model of the ascending aortic arch. Three mechanical heart valves representative of the different types of commercial models (a tilting disc, a ball in cage and a two-leaflet valve) and a new bileaflet prototype were investigated. From examination of the velocity field, it is possible to define the main characteristics of the valve wake and to observe the development of negative velocities associated with regurgitant flows. From a comparison with tests in rigid tubes, the role played by the arch elasticity is analysed.
利用心血管模拟器在体外复制通过主动脉瓣位的血流状况，在升主动脉弓弹性模型中，通过8兆赫超声多普勒系统重建非常靠近瓣膜处的二维速度图。研究了三种代表不同类型商业模型的机械心脏瓣膜（一个倾斜盘瓣、一个笼球瓣和一个双叶瓣）以及一种新型双叶瓣原型。通过对速度场的检查，可以确定瓣膜尾流的主要特征，并观察与反流相关的负速度的发展。通过与刚性管试验的比较，分析了主动脉弓弹性所起的作用。
