PDF(Pubmed)
Abstract：
In this study, we conducted a numerical analysis on catheter sizes using computational fluid dynamics to assess urinary flow rates during intermittent catheterization (IC). The results revealed that the fluid (urine) movement within a catheter is driven by intravesical pressure, with friction against the catheter walls being the main hindrance to fluid movement. Higher-viscosity fluids experienced increased friction with increasing intravesical pressure, resulting in reduced fluid velocity, whereas lower-viscosity fluids experienced reduced friction under similar pressure, leading to increased fluid velocity. Regarding urine characteristics, the results indicated that bacteriuria, with lower viscosity, exhibited higher flow rates, whereas glucosuria exhibited the lowest flow rates. Additionally, velocity gradients decreased with increasing catheter diameters, reducing friction and enhancing fluid speed, while the friction increased with decreasing diameters, reducing fluid velocity. These findings confirm that flow rates increased with larger catheter sizes. Furthermore, in terms of specific gravity, the results showed that a 12Fr catheter did not meet the ISO-suggested average flow rate (50 cc/min). The significance of this study lies in its application of fluid dynamics to nursing, examining urinary flow characteristics in catheterization. It is expected to aid nurses in selecting appropriate catheters for intermittent catheterization based on urinary test results.
摘要：
在这项研究中,我们使用计算流体动力学对导管尺寸进行了数值分析,以评估间歇性导尿(IC)期间的尿流率.结果显示，导管内的液体（尿液）运动是由膀胱内压力驱动的，与导管壁的摩擦是流体运动的主要障碍。随着膀胱内压力的增加，高粘度流体的摩擦增加，导致流体速度降低，而低粘度的流体在相似的压力下经历了减少的摩擦，导致流体速度增加。关于尿液特征，结果表明，细菌尿症，具有较低的粘度，表现出更高的流速，而糖尿表现出最低的流速。此外,速度梯度随着导管直径的增加而降低，减少摩擦和提高流体速度，而摩擦随着直径的减小而增加，降低流体速度。这些发现证实了流速随着导管尺寸的增大而增加。此外，就比重而言，结果显示,12Fr导管不符合ISO建议的平均流速(50cc/min).本研究的意义在于将流体动力学应用于护理,检查导尿中的尿流量特征。期望帮助护士根据尿检结果选择合适的导管进行间歇导尿。
