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Related Experiment Videos

Capacitance hydrophones for pressure determination in lithotripsy.

L Filipczyński1, J Etienne

  • 1Department of Ultrasonics, Polish Academy of Sciences, Warsaw.

Ultrasound in Medicine & Biology
|January 1, 1990
PubMed
Summary

Capacitance hydrophones offer durable, wide-band pressure measurements for shock waves in lithotripsy. While accurate, they can distort pulse shapes, limiting use to focal regions.

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Medical Devices

Background:

  • Shock wave pressure measurements are critical in lithotripsy for treatment efficacy and safety.
  • Existing hydrophone technologies present limitations in durability, frequency response, or accuracy for shock wave analysis.

Purpose of the Study:

  • To design and evaluate capacitance hydrophones for accurate pressure measurements of shock waves generated during lithotripsy.
  • To provide methodologies for determining pressures and calibrating these hydrophones using electrical measurements.

Main Methods:

  • Development and theoretical analysis of capacitance hydrophone design for shock wave applications.
  • Experimental calibration and comparative measurements against electrodynamic and PVDF hydrophones.
  • Analysis of hydrophone properties including durability, nonlinearity, and frequency bandwidth.

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Main Results:

  • Capacitance hydrophones demonstrate high durability, controlled nonlinearity, and a wide frequency band.
  • Comparative measurements validated the peak pressure values obtained with capacitance hydrophones.
  • Observed distortions in the overshoot shape of shock wave pulses were noted.

Conclusions:

  • Capacitance hydrophones are suitable for accurate peak pressure measurements in lithotripsy shock waves.
  • Their application is best suited for measurements within the focal region due to potential pulse shape distortions.