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Experimental simulation of model platelet adhesion to a semi-permeable wall exposed to flow disturbance

机译:模型血小板粘附于暴露于流动扰动的半透壁的实验模拟

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A sudden tubular expansion with a semi-permeable wall was constructed from a tubular dialysis membrane to investigate the effects of filtration flow and flow disturbance on particle deposition. The expansion was perfused with a dilute, neutrally buoyant suspension of 1.10 μm diameter polystyrene latex spheres (as models of platelets) in Tris buffer solution containing 10% Dextran T70 and 2% bovine serum albumin. The results showed that adhesion of particles correlated positively with the filtration rate and inversely with the wall shear rate. In the vortex flow region distal to the expansion, particle adhesion was significantly elevated with a maximum at the reattachment point where the wall shear rate was the lowest and particles were constantly carried toward the vessel wall along the curved streamlines. In conclusion, filtration flow has a profound impact on the interaction of blood cells such as platelets with blood vessel walls, and the disturbed flow with a low wall shear rate can enhance the deposits of platelet thrombi to the vessel wall.
机译:用管状透析膜构造具有半透壁的突然管状膨胀,以研究过滤流量和流量扰动对颗粒沉积的影响。在含有10%的Dextran T70和2%的牛血清白蛋白的Tris缓冲溶液中,用直径为1.10μm的聚苯乙烯乳胶球(作为血小板模型)的稀释的中性浮力悬浮液灌注膨胀液。结果表明,颗粒的附着力与过滤速率成正相关,与壁剪切速率成反比。在膨胀远端的涡流区域,颗粒附着力显着提高,在重新附着点处最大,在该处壁的剪切速率最低,并且颗粒沿着弯曲的流线不断被带向血管壁。总之,过滤流对诸如血小板之类的血细胞与血管壁的相互作用具有深远的影响,而具有低壁剪切速率的扰动流可以增强血小板血栓在血管壁上的沉积。

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