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Related Experiment Videos

Optimizing results of lithotripsy using robust electromagnetic probe.

F X Keeley1, S D Pye, G Smith

  • 1Scottish Lithotriptor Centre, Western General Hospital, Edinburgh, Scotland, UK.

Journal of Endourology
|July 16, 1999
PubMed
Summary
This summary is machine-generated.

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The use of extra-corporeal shockwave lithotripsy for obstructing ureteric stones.

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The management of ureteric stones.

Annals of the Royal College of Surgeons of England·2010

A new electromagnetic probe measures lithotripter shockwave forces, enabling optimized shockwave lithotripsy (SWL) protocols. This led to improved stone-free rates and reduced retreatment for ureteral stones.

Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Urology

Background:

  • Measuring lithotripter shockwave forces is challenging due to their destructive nature.
  • Existing devices are often impractical for in vitro force measurement.
  • A novel electromagnetic probe was developed to overcome these limitations.

Purpose of the Study:

  • To develop and test a robust electromagnetic probe for measuring cavitational forces in lithotripter focal zones.
  • To assess the probe's utility in optimizing shockwave lithotripsy (SWL) treatment strategies.
  • To evaluate the clinical impact of a revised SWL protocol based on probe measurements.

Main Methods:

  • An electromagnetic probe was designed to respond to pressure gradients from cavitation bubble motion.

Related Experiment Videos

  • The probe was used to measure shockwave effects from the Dornier MPL 9000 electrohydraulic lithotripter.
  • Electrode performance and energy output were monitored throughout their lifespan.

    • Main Results:

    • Electrode pulse energy declined significantly after 50% of their expected lifetime.
    • Higher power settings (kilovoltage) improved electrode efficiency.
    • The revised SWL protocol (higher kV, additional electrode) increased stone-free rates from 68.2% to 83.3% for ureteral stones < 11 mm.
    • Retreatment rates decreased from 23% to 15%.

    Conclusions:

    • The electromagnetic probe is a valuable tool for measuring lithotripter cavitational forces and informing treatment strategies.
    • A new SWL protocol, guided by probe measurements, resulted in significant clinical improvements.
    • The probe facilitates objective comparisons between different SWL devices.