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Related Experiment Videos

Prefocal alignment improves stone comminution in shockwave lithotripsy.

Dahlia L Sokolov1, Michael R Bailey, Lawrence A Crum

  • 1Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle 98105, USA.

Journal of Endourology
|January 25, 2003
PubMed
Summary
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Optimizing shockwave lithotripsy (SWL) by shifting stone alignment 2 cm before the focal point (F2) can improve stone comminution and reduce tissue damage. This simple adjustment enhances treatment effectiveness without increasing injury.

Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Urology

Background:

  • Shockwave lithotripsy (SWL) is effective for kidney stone treatment, but associated tissue damage is a concern.
  • Cavitation, a phenomenon during SWL, contributes to both stone fragmentation and tissue injury.
  • Current clinical practice aligns stones with the geometric focus (F2), where cavitation is not maximal.

Purpose of the Study:

  • To investigate the effects of shockwave lithotripsy (SWL) at different focal axis positions.
  • To determine optimal stone alignment for enhanced stone comminution and reduced tissue damage.
  • To evaluate cavitation activity, stone fragmentation, hemolysis, and free-radical production along the focal axis.

Main Methods:

  • In vitro assessment of stone comminution, hemolysis, and hydroxyl radical production along the focal axis.

Related Experiment Videos

  • In vivo study using pig kidneys to assess hemorrhagic injury after SWL.
  • Model gypsum stones and 10% hematocrit blood samples were exposed to controlled shockwave parameters.

    • Main Results:

    • Stone comminution (fragments >1.5 mm and weight loss) was significantly higher at F2-2 cm compared to F2.
    • Hemolysis levels were comparable at F2 and F2-2 cm, but decreased at other positions.
    • Hydroxyl radical production and tissue injury volume were greatest at F2-2 cm, indicating increased cavitation activity.

    Conclusions:

    • Shifting stone alignment 2 cm proximal to the focal point (F2-2 cm) enhances stone comminution.
    • This strategic alignment may achieve faster stone fragmentation with comparable or reduced tissue damage.
    • The findings suggest a simple modification to SWL protocols for improved clinical outcomes.