Analysis of Urine Flow in Three Different Ureter Models

Area of Science:

• Biomedical Engineering
• Urology
• Fluid Dynamics

Background:

• Normal urine flow relies on ureteral peristalsis and hydrostatic pressure.
• Ureteral diseases and double J stents can disrupt peristalsis, altering ureter shape.
• Abnormal ureter contours may include tubular, funnel, or combined shapes.

Purpose of the Study:

• To investigate urine flow rate and patterns in anatomically based, abnormal ureter models.
• To analyze the effects of ureteral stenosis and different double J stent designs on urine flow.
• To understand how ureter geometry influences flow dynamics under pathological conditions.

Main Methods:

• Creation of three distinct, curved ureter models (tubular, funnel, undulated) based on human anatomy.
• Numerical analysis of urine flow rate and pattern.
• Simulation of conditions with and without ureteral stenosis.
• Evaluation of four different double J stent types within the models.

Main Results:

• Ureter shape significantly influenced luminal flow rate and urine flow patterns.
• The geometry of the ureter affected how urine flowed.
• Side holes of double J stents demonstrated varied roles in flow detour based on ureter geometry.

Conclusions:

• Ureter shape is a critical factor in determining urine flow characteristics.
• Double J stent design and placement interact with ureter geometry to influence flow.
• Understanding these interactions is vital for managing conditions affecting ureteral function.