乳幼児点滴時のカテーテル周辺の血栓形成の流路モデルによる可視化観察と流動解析

抄録

This paper describes the relation between relative position of peripheral intravenous catheter (PIVC)in vein and thrombus generation around it. In this study, it is assumed that the contact of catheter on the vein wall causes thrombus formation due to change of flow filed. In the first step, the thrombus formation process was visualized by using a vascular model. As a result, a thrombus was found around a catheter at 240 s in case of 0 ml/h flow of the intravenous feeding, but in case of 20ml / h it takes 480 s. Then the flow rate of PIVC was changed from 20 ml / h to 0ml / h with the stepwise reduction. It was found that thrombus was increasing on the catheter circumference. In the next step, in order to investigate the effects of flow rate of PIVC on the flow field, CFD analysis around the catheter in the infantile vein was done. The results show that there are low shear rate regions, low velocity regions, and long retention time region near the area of catheter’s contact. By using the proposed evaluation value of thrombus formation with strain rate and retention time. It was concluded that feeding flow rate of PIVC is sensitive to thrombus formation rate, and the high flow rate of PIVC has low risk for thrombus formation.