ارايه يك مدل مكانيكي براي تحريك پريستالتيك ميزناي در انتقال ادرار از كليه به مثانه

A Mechanical Model of Urine Peristaltic Transport from the Kidney into the Bladder

Ureter reflux is one of the prevalent factors causing pyelonefrit and sistit syndromes. Dilatation of ureter, renal pelves and calyx are normally detectable with reflux. An axisymmetric model using the fluid-structure interactions (FSI) method is introduced and solved to perform the ureter flow and stress analysis. The Navier-Stokes equations were solved for the fluid and a linear elastic model wass used for ureter. Our results indicate that the fluid shear stresses on the wall and the pressure gradient magnitude along the ureter wall as well as the symmetry line are high around the throat of motion contracted wall which decreases while peristalsis propagates toward the bladder. Reflux is more probable to occur at the startup of the wall peristaltic motion.