The effect of the ureterovesical junction on urinary peristaltic flow

Eghbal, Atabak; Rassoli, Aisa; Fatouraee, Nasser

doi:10.1109/icbme.2016.7890939

Cited by 1 publication

(3 citation statements)

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“…Two dimensionless variables, (1) Time-mean flow φ, which measures the mean volume flow rate covected toward outlet. and (2) Pressure rise per wavelength ΔP λ , which calculates the increase of pressure per wavelength are introduced as ( 15), (16), respectively. The relationship between these variables is also plotted as Figure 4.…”

Section: Validationmentioning

confidence: 99%

“…10,11 Furthermore, although some biological fluids have non-Newtonian mechanical responses and the results of related papers introducing mathematical models and analytical solutions show different and intricate reactions of these fluids in peristaltic motions, [12][13][14] many numerical studies have been conducted to perceive the principles of ureteral physiology and the peristalsis mechanism formed in the ureter. 15,16 In these papers, in addition to the anatomy of the human ureter, the effects of several pressure differences, different lumen cross-sections, and contraction wave velocities on the urinary flow were investigated. Moreover, the changes in ureteral peristalsis caused by illnesses, and the impacts of drugs on modulating its function were also explored.…”

Section: Introductionmentioning

confidence: 99%

“…Since peristaltic motion is a principal trait in many biological ducts like reproductive organs, esophagus, and ureters, many numerical studies have been performed to understand the transport mechanism of fluid contents 10,11 . Furthermore, although some biological fluids have non‐Newtonian mechanical responses and the results of related papers introducing mathematical models and analytical solutions show different and intricate reactions of these fluids in peristaltic motions, 12–14 many numerical studies have been conducted to perceive the principles of ureteral physiology and the peristalsis mechanism formed in the ureter 15,16 . In these papers, in addition to the anatomy of the human ureter, the effects of several pressure differences, different lumen cross‐sections, and contraction wave velocities on the urinary flow were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of an obstacle motion in the human ureter using the dynamic mesh approach

Abbasian,

Maddahian

2024

Numer Methods Biomed Eng

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Peristalsis is a common motion in various biological systems, especially the upper urinary tract, where it plays a pivotal role in conveying urine from the kidneys to the bladder. Using computational fluid dynamics, this study aims to investigate the effect of various peristaltic parameters on the motion of an obstacle through a two‐dimensional ureter. Methodologically, Incompressible Navier–Stokes equations were utilized as the fluid domain's governing equations, and the Dynamic Mesh method (DM) was employed to simulate the peristaltic and obstacle motion. The peristaltic motion was modeled by a sinusoidal contraction wave propagating alongside the ureter at the physiological speed, and the motion of the obstruction through the ureter, which is caused by the fluid forces applied on its surface, was explored using the equation of Newton's second law. Various test cases of different shapes and sizes were supposed as kidney stones to understand the influence of the peristalsis properties on the stone removal process. The results show that the motion of the kidney stone is highly influenced by the gradient pressure force applied to its surface in the fluid domain. Moreover, investigating the effects of the peristaltic physical properties on the obstacle's motion indicates that the stone's motion is dependent on these parameters. Furthermore, this analysis provides insight into the peristaltic motion effects, assisting physicians in developing new medicines to facilitate the kidney stone removal process based on its shape and size.

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Section: Validationmentioning

confidence: 99%