Assessing irrigation flows influence on clearance of

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simulated, while the movements of the particles were monitored by a high-speed digital camera (figure). Particle movement of both models was compared at ...
33rd Annual EAU Congress Copenhagen

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Assessing irrigation flows influence on clearance of renal calculi fragments during PCNL: A hydrodynamic computerized and practical model study Eur Urol Suppl 2018; 17(2);e1219

Dekalo S. 1 , Barghouty Y. 1 , Shlain S. 2 , Liberzon A. 3 , Paster A. 3 , Aviram G. 4 , Sofer M. 1 1 3

Tel-Aviv Sourasky Medical Center, Dept. of Urology, Tel-Aviv, Israel, 2School of Mechanical Engineering, Dept. of Hydrology, Tel-Aviv, Israel,

Tel-Aviv University , Dept. of Hydrology, Tel-Aviv, Israel, 4Tel-Aviv Sourasky Medical Center, Dept. of Radiology, Tel-Aviv, Israel

Introduction & Objectives: The irrigation flow used in PCNL creates a clear endoscopic view and contributes to flushing out residual fragments as shown by the vacuum cleaning effect recently described. We aimed to further analyze these processes using computerized models (CM) for prediction and a PCNL practical model (PM) to validate the calculations.

Materials & Methods: COMSOL Multiphysics® software was used to simulate the irrigation flows and the particles’ movements in a twodimensional kidney model based on CT imaging graphically translated by CAD software. A similarly shaped model was constructed, and PCNL was simulated, while the movements of the particles were monitored by a high-speed digital camera (figure). Particle movement of both models was compared at various flow velocities and nephroscopic positions.

Results: Results for various velocities at 90° and various angles at a velocity of 1 m/s are reported here.The numerical model predicted a significantly increased particle clearance with high-velocity irrigation (0.25 vs 1 m/s, 12% vs 70%: p