Jones S A, Giddens D P, Loth F, Zarins C K, Kajiya F, Morita I, Hiramatsu O, Ogasawara Y, Tsujioka K
Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
J Biomech Eng. 1997 Feb;119(1):30-8. doi: 10.1115/1.2796061.
In-vivo velocity profiles were recorded with a 20 MHz 80-channel pulsed Doppler ultrasound velocimeter in canine end-to-side ilio-femoral anastomotic grafts. The geometries were obtained from casts of the anastomotic region, and flow rates were measured with electromagnetic flow probes. Three cases reported here include a "standard" geometry, which was similar to previously studied in vitro models, a stenosed geometry, and a case with below average flow rate. Observed flow features include separation at the hood and toe, movement of the floor stagnation point, and skewed profiles in the proximal outflow segment. Out-of-plane curvature and lateral displacement of the anastomosis inlet appear to have a strong effect on the flow fields. In addition, compliance affects the instantaneous flow rates within the proximal and distal branches.
采用一台20MHz 80通道脉冲多普勒超声测速仪记录犬端侧髂股吻合移植血管的体内速度剖面。通过吻合区域铸型获得几何形状，并使用电磁流量探头测量流速。这里报告的三个病例包括一个“标准”几何形状（类似于先前研究的体外模型）、一个狭窄几何形状和一个流速低于平均水平的病例。观察到的流动特征包括在吻合口前缘和后缘处的分离、底部驻点的移动以及近端流出段的不对称剖面。吻合口入口的平面外曲率和横向位移似乎对流场有很大影响。此外，顺应性会影响近端和远端分支内的瞬时流速。
