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Related Experiment Videos

High-efficiency shock-wave generator for extracorporeal lithotripsy

P Broyer1, D Cathignol, Y Theillère

  • 1INSERM U281, Lyon, France.

Medical & Biological Engineering & Computing
|September 1, 1996
PubMed
Summary

This study introduces a novel coaxial shock-wave generator for extracorporeal lithotripsy, significantly boosting electro-acoustic efficiency. The new design doubles efficiency by minimizing circuit inductance, offering a more effective treatment for kidney stones.

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Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Acoustics

Background:

  • Extracorporeal lithotripsy electrohydraulic generators face efficiency limitations due to electrical discharge circuit inductance.
  • Optimizing electro-acoustic efficiency is crucial for improving shock-wave generation in medical applications.

Purpose of the Study:

  • To develop and evaluate a novel shock-wave generator with enhanced electro-acoustic efficiency for extracorporeal lithotripsy.
  • To investigate the impact of a coaxial discharge line and minimal inductance spark gap on shock-wave generation.

Main Methods:

  • A new generator utilizing a para-electric ceramic coaxial discharge line with minimal inductance was designed.
  • A coaxial spark gap facilitated triggered breakdown, and shock waves were generated using a coaxial electrode in degassed saline.

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  • Electrode gap and electrolyte resistivity were optimized to match the line's characteristic impedance.

    • Main Results:

    • The novel generator produced a rectangular current pulse (6000 A, 50 ns rise time).
    • Expansive peak pressure pulse increased by 105% at 10 kV, 86.5% at 12 kV, and 34.5% at 14 kV compared to conventional generators.
    • Electro-acoustic efficiency improved to 11% from 5.5% in conventional circuits.

    Conclusions:

    • The coaxial discharge line design significantly enhances electro-acoustic efficiency in electrohydraulic shock-wave generators.
    • This advancement offers improved performance for extracorporeal lithotripsy devices.
    • The optimized generator design represents a substantial improvement over conventional systems.