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Laser Induced Shock Waves for Medical Applications

  • E. Steiger
  • W. Uebelacker

Abstract

Extracorporal shock wave lithotripsy (ESWL) is by now a well established method to fracture human kidney and gall bladder stones in vivo.

One method of generating shock waves in water is to focus a laser beam of short pulse width and high energy to a point.

We report on experiments with a Q-switched Nd:YAG laser causing an optical breakdown in the focal region of a lens. It was found that the shock wave formation and dynamic depends not only on the lens performance but also on the laser beam properties. Using a semi-elliptic reflector we measured the temporal and spatial behaviour of the reflected and focused shock wave and studied the pressure distribution at the second focal point of the reflector with an ultra-fast PVDF-transducer and time-resolved Schlieren photographs. First in vitro-experiments on kidney and gall bladder stones gave reasonable results.

Keywords

Shock Wave Extracorporal Shock Wave Lithotripsy Cavitation Bubble Intense Light Pulse Optical Breakdown 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Chaussy, Ch. et al. Extracorporeal Shock Wave Lithotripsy Karger, Munich 1982Google Scholar
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    Charko, R.E. Laser Shock Wave Lithotripsy Master thesis of Science in Aeronautics and Astronautics University of Washington, 1984Google Scholar
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    Vogel, A. et al. Cavitation bubble dynamics and acoustic transient generation in ocular surgery with pulsed Nd:YAG lasers Third Physical Institute, University of Goettingen, FRGGoogle Scholar

Copyright information

© Springer-Verlag Berlin, Heidelberg 1988

Authors and Affiliations

  • E. Steiger
    • 1
  • W. Uebelacker
    • 1
  1. 1.Applied ResearchDornier Medizintechnik GmbHGermering/DGermany

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