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Related Concept Videos

Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

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Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
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Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

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IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
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The Vortex Effect in Minimally Invasive Percutaneous Nephrolithotomy.

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The vortex effect in minimally invasive percutaneous nephrolithotomy (MIP) is influenced by fluid speed and equipment size. A larger access sheath diameter relative to the nephroscope improves vortex effect efficacy.

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Area of Science:

  • Urology
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Minimally invasive percutaneous nephrolithotomy (MIP) utilizes specialized equipment to remove kidney stones.
  • Understanding fluid dynamics, specifically the vortex effect, is crucial for optimizing MIP procedures.
  • The interplay between equipment geometry and fluid flow impacts surgical outcomes.

Purpose of the Study:

  • To elucidate the physical principles governing the vortex effect.
  • To assess the applicability of the vortex effect in MIP procedures.
  • To investigate how equipment dimensions influence vortex formation and efficacy.

Main Methods:

  • Acrylic phantom models simulating MIP nephroscope and access sheath dimensions (15/16F and 21/22F) were created.
  • Hydrolysis and hydrogen bubbles were used for flow visualization under laser illumination.
  • Computational fluid dynamics (CFD) simulations determined speed and pressure profiles at a flow rate of 12.0 mL/s.

Main Results:

  • A stagnation point was observed in both models, preventing fluid entry into the collecting system phantom.
  • The 14 mm sheath (CSA ratio: 0.69) generated significant vortices and a high pressure gradient (114.4 N/m²).
  • The 20 mm sheath (CSA ratio: 0.30) exhibited a much smaller pressure gradient (19.4 N/m²) with no noticeable vortices.

Conclusions:

  • Fluid speed and equipment geometry dictate the pressure gradient and vortex field, creating the vortex effect.
  • A higher cross-sectional area (CSA) ratio between the nephroscope and access sheath enhances vortex effect efficacy at a constant flow rate.
  • Optimizing sheath size is key to harnessing the vortex effect in MIP procedures.