Simulation Study Of Stenotic Ureter Based On CFD

The ureter is a part of the upper urinary tract located between the kidneys and bladder.Urine produced in the kidneys is transported to the bladder through the ureter,where peristaltic contractions and hydrodynamics control the transport of urine from the kidneys to the bladder.Ureteral stenosis caused by benign or malignant diseases lead to insufficient urine flow from the kidneys to the bladder,which,if left untreated,can cause irreversible renal failure and pose a threat to life and health.In this study,based on the background of urology,30%,50%,70%,and 90% narrowed ureteral models were constructed.By combining the research thoughts,theories,techniques of mechanical dynamics and the flow field of the urinary tract,the dynamic characteristics of the urinary flow were studied based on the theoretical basis of fluid-structure interaction.Numerical simulation studies were carried out on ureteral models with different degrees of stenosis under different perfusion flow rates.The simulation results showed that the dynamic characteristics such as the entrance pressure,Von Mises stress,and deformation of the ureteral wall of the 90% narrowed model changed most significantly.Therefore,when the degree of stenosis is severe,the ureter is very prone to pathological changes.At the same time,the commonly used medical device for treating ureteral strictures in urological surgery,the ureteral stent,was modeled,and the influence of its model and the arrangement of side holes on its drainage effect was studied.The results showed that stents with smaller diameters were more likely to achieve the desired drainage effect.Increasing the number of side holes in the front and rear parts of the ureteral stent passing through the stenosis segment could significantly improve the urine flow rate.By using the cross-disciplinary application concept,this study explored common diseases and treatment options in urological surgery using commonly used fluid analysis methods in mechanics,providing a new approach to solving urological diseases.We hope that this study can provide some reference for the diagnosis and treatment of ureteral strictures,and provide a theoretical basis for the research and development of non-invasive urodynamic testing technique...