PMID: 8945854Sep 1, 1996Paper

High-efficiency shock-wave generator for extracorporeal lithotripsy

Medical & Biological Engineering & Computing
P BroyerJ L Mestas

Abstract

In extracorporeal lithotripsy, the electro-acoustic efficiency of electrohydraulic generators is limited by the inductance of the electrical discharge circuit. A new shock-wave generator is described that uses a coaxial discharge line enabling electro-acoustic efficiency to be greatly increased. The line is built using a para-electric ceramic with a relative dielectric constant of 1700, manufactured for use in high-voltage impulse mode. A coaxial spark gap, with minimal inductance, has been developed to obtain the triggered breakdown of the discharge line. Shock waves are created with a coaxial electrode plugged directly into the spark gap and immersed in an electrolyte of degassed saline. Electrode gap and electrolyte resistivity are adjusted to match the resistivity of the electrolyte volume between the underwater electrodes to the characteristic impedance of the line. The discharge line generates in the medium a rectangular current pulse with an amplitude of about 6000 A and a rise time of 50 ns. Compared with conventional generators, measurements of the expansive peak pressure pulse show an increase of 105% at 10 kV, 86.5% at 12 kV and 34.5% at 14 kV charging voltage. Electro-acoustic efficiency is found to be 11% instead o...Continue Reading

References

Jan 1, 1991·Photochemistry and Photobiology·E H White, D F Roswell
Jul 1, 1948·American Journal of Surgery·F R COLE

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Citations

Jun 21, 2003·Journal of Endourology·Jian-Zhi HanYing-Lu Guo
Oct 31, 2002·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Jean-Pierre SferruzzaDominique Cathignol
Aug 11, 2004·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Alain BirerDominique Cathignol
Nov 9, 2011·Journal of Korean Medical Science·Sung Bin ChonSeung-Joon Lee

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