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Lithotripsy shock‐wave field characterization: Tools and techniques
Abstract

Lithotripsy shock‐wave field characterization: Tools and techniques

Mark E. Schafer and Peter A. Lewin
The Journal of the Acoustical Society of America, v 90(4), pp 2339-2339
Oct 1991
DOI: https://doi.org/10.1121/1.402213

Abstract

Accurate lithotripsy pressure field characterization presents a uniquely difficult acoustic measurement problem: how to design a sensor to survive in the destructive shock‐wave environment without sacrificing bandwidth or signal fidelity. This presentation discusses the development, design, and use of reliable, wideband, quantitative shock wave sensors made of piezoelectric polymers such as polyvinylidene difluoride (PVDF). In design, there is a delicate balance between sensor survivability and acoustic performance (i.e., frequency response and directivity). In use, there is a balance between the need for statistically stable measurement data, and the calibration stability of the sensors after repeated shock‐wave exposure. These points can be illustrated by selected measurement examples of lithotripter field distributions and shock‐wave pressure‐time histories. In addition, ongoing development work on a sensor designed for insertion into the body holds the promise of providing reliable in vivo acoustic pressure measurements. These advances in sensor technology will contribute to improved lithotripsy treatment, in terms of understanding the mechanisms of stone destruction and tissue damage, reducing patient trauma, and regulating new lithotripsy technology.

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