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Related Experiment Videos

Calculus migration characterization during Ho:YAG laser lithotripsy by high-speed camera using suspended pendulum

Jian James Zhang1, Danop Rajabhandharaks2, Jason Rongwei Xuan2

  • 1Boston Scientific Corp, 3070 Orchard Drive, San Jose, CA, 95134, USA. james.zhang@bsci.com.

Lasers in Medical Science
|April 13, 2017
PubMed
Summary

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A new pendulum model significantly improves the study of calculus migration during laser lithotripsy by eliminating friction. This method offers greater sensitivity and repeatability compared to conventional techniques for analyzing stone movement.

Area of Science:

  • Biomedical Engineering
  • Urology
  • Experimental Physics

Background:

  • Calculus migration is a common challenge in ureteroscopic laser lithotripsy for urolithiasis.
  • Conventional experimental methods for studying calculus migration exhibit significant variation and poor detectability due to friction.

Purpose of the Study:

  • To develop and validate a novel experimental model for investigating calculus migration.
  • To enhance the sensitivity and repeatability of calculus migration experiments by minimizing friction.

Main Methods:

  • A pendulum model suspended underwater was employed to eliminate friction during calculus migration studies.
  • A pulsed Holmium:YAG laser and a Plaster of Paris calculus phantom were used to simulate laser lithotripsy.
  • High-speed videography (10,000 FPS) and MATLAB analysis captured and quantified calculus displacement, speed, and acceleration.
Keywords:
CalculusHigh-speed cameraLaser lithotripsyMigrationPendulumRetropulsion

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Main Results:

  • The pendulum model demonstrated significantly higher calculus displacement (up to 4.37 mm) compared to conventional methods (<0.5 mm).
  • Increased laser energy per pulse (0.5, 1.0, 1.5 J) resulted in greater calculus displacement.
  • Reduced phantom size led to inconsistent displacement, highlighting the model's sensitivity.

Conclusions:

  • The underwater pendulum model effectively minimizes friction, leading to improved sensitivity and repeatability in calculus migration experiments.
  • This novel approach provides a more accurate method for studying calculus movement during simulated laser lithotripsy.
  • Future research will further investigate calculus movement dynamics and sources of experimental variation.