Flow behavior within the 12-cc Penn state pulsatile pediatric ventricular assist device: An experimental study of the initial design
Flow behavior within the 12-cc Penn state pulsatile pediatric ventricular assist device: An experimental study of the initial design
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DOI：
10.1111/j.1525-1594.2008.00565.x
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发表时间：
2008-06-01
影响因子：
2.4
通讯作者：
Deutsch, Steven
中科院分区：
文献类型：
--
作者：
Manning, Keefe B.;Wivholm, Brandon D.;Deutsch, Steven
平面粒子图像测速用于探索新设计的 12 cc 宾夕法尼亚州立大学气动儿科辅助泵的流动行为。壁剪切图补充了速度数据。 Bjork-Shiley Monostrut 17 毫米机械心脏瓣膜用于入口和出口。与较大的宾夕法尼亚州立大学泵相比，12 cc 装置不仅更小，而且还减少了阀门有效孔口面积和更大角度的阀门端口。与较大泵的结果相反，舒张早期的流场是高度三维的，阀门入口射流的穿透力较差。这导致后来开始出现“洗墙”轮换模式。在舒张后期，出口瓣叶上游形成了一个以前从未观察到的显着分离区域，有效地减少了面积并增加了通过瓣膜的压降。壁剪切图表明，在整个循环过程中，出口侧泵底部可能会持续存在低剪切区域。计划尝试通过探索不同的阀门、阀门方向和入口阀门角度、收缩/舒张流动定时以及可能更大的出口阀门来改善流场特性。
Planar particle image velocimetry was used to explore the flow behavior of the newly designed 12-cc Penn State pneumatic pediatric assist pump. Wall shear maps complemented the velocity data. Bjork-Shiley Monostrut 17-mm mechanical heart valves were used in the inlet and outlet ports. In comparison with larger Penn State pumps, the 12-cc device is not only smaller but has reduced valve effective orifice areas and more highly angled valve ports. In contrast to results from the larger pumps, the flow field was highly three dimensional during early diastole with poorer penetration by the valve inlet jet. This led to a later start to a "wall washing" rotational pattern. A significant separation region, never before observed, was created upstream of the outlet valve leaflet during late diastole-effectively reducing the area and increasing the pressure drop through the valve. Wall shear maps suggest that regions of low shear might persist throughout the cycle at the bottom of the pump on the outlet side. An attempt to improve the flow field characteristics by exploring different valves, valve orientations and inlet valve angles, systolic/diastolic flow timing, and perhaps a larger outlet valve was planned.