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Related Experiment Videos

Shock wave-inertial microbubble interaction: a theoretical study based on the Gilmore formulation for bubble

S Zhu1, P Zhong

  • 1Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.

The Journal of the Acoustical Society of America
|November 26, 1999
PubMed
Summary

This study models bubble dynamics during lithotripsy, confirming shock wave interactions generate cavitation. Optimizing shock wave parameters can control microbubble collapse and reduce vascular injury risks.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Biomedical Engineering

Background:

  • Extracorporeal shock wave lithotripsy (ESWL) uses shock waves to break kidney stones.
  • Cavitation bubble dynamics play a critical role in ESWL effectiveness and potential side effects.
  • Understanding shock wave-inertial microbubble interactions is crucial for optimizing lithotripsy treatments.

Purpose of the Study:

  • To theoretically investigate cavitation activity produced by lithotripters using a bubble dynamics model.
  • To analyze the interaction between lithotripter shock waves and inertial microbubbles.
  • To evaluate methods for controlling bubble collapse and mitigating vascular injury risks.

Main Methods:

  • Utilized the Gilmore formulation for bubble dynamics.

Related Experiment Videos

  • Incorporated zeroth-order gas diffusion models.
  • Simulated interactions for modified XL-1 and Dornier HM-3 lithotripters.

    • Main Results:

    • Model confirmed experimental observations of bubble dynamics, including strong secondary shock wave emission from shock wave-inertial microbubble interaction.
    • Demonstrated consistent forced collapse of inertial microbubbles with strong secondary shock wave emission using specific shock wave and delay parameters.
    • Showed that truncating tensile stress in lithotripter shock waves reduces bubble expansion, potentially lowering vascular injury risk.

    Conclusions:

    • The theoretical model accurately predicts key features of bubble dynamics during lithotripsy.
    • Controlled inertial microbubble collapse and secondary shock wave emission are achievable with optimized lithotripter parameters.
    • Modifying shock wave properties offers a potential strategy to enhance lithotripsy safety by reducing vascular damage.