Kim Kyung-Wuk, Choi Young Ho, Lee Seung Bae, Baba Yasutaka, Kim Hyoung-Ho, Suh Sang-Ho
Department of Mechanical Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-gu, Seoul 156-743, Republic of Korea.
Department of Radiology, Seoul National University Boramae Hospital, 425 Shindaebang-2-dong, Dongjak-gu, Seoul 156-707, Republic of Korea.
Comput Math Methods Med. 2017;2017:5172641. doi: 10.1155/2017/5172641. Epub 2017 Jun 4.
The ureter provides a way for urine to flow from the kidney to the bladder. Peristalsis in the ureter partially forces the urine flow, along with hydrostatic pressure. Ureteral diseases and a double J stent, which is commonly inserted in a ureteral stenosis or occlusion, disturb normal peristalsis. Ineffective or no peristalsis could make the contour of the ureter a tube, a funnel, or a combination of the two. In this study, we investigated urine flow in the abnormal situation. We made three different, curved tubular, funnel-shaped, and undulated ureter models that were based on human anatomy. A numerical analysis of the urine flow rate and pattern in the ureter was performed for a combination of the three different ureters, with and without a ureteral stenosis and with four different types of double J stents. The three ureters showed a difference in urine flow rate and pattern. Luminal flow rate was affected by ureter shape. The side holes of a double J stent played a different role in detour, which depended on ureter geometry.
输尿管为尿液从肾脏流向膀胱提供了一条通道。输尿管的蠕动与静水压力一起部分推动尿液流动。输尿管疾病以及通常插入输尿管狭窄或阻塞处的双J支架会干扰正常蠕动。无效或无蠕动可能使输尿管的外形呈管状、漏斗状或两者结合。在本研究中，我们调查了异常情况下的尿液流动。我们基于人体解剖结构制作了三种不同的模型，分别是弯曲管状、漏斗状和波浪状输尿管模型。针对三种不同输尿管的组合，在有和没有输尿管狭窄以及使用四种不同类型双J支架的情况下，对输尿管内的尿流率和模式进行了数值分析。三种输尿管在尿流率和模式上存在差异。管腔内流速受输尿管形状影响。双J支架的侧孔在绕行中发挥了不同作用，这取决于输尿管的几何形状。
