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Shock-induced collapse of a gas bubble in shockwave lithotripsy

Johnsen, Eric and Colonius, Tim (2008) Shock-induced collapse of a gas bubble in shockwave lithotripsy. Journal of the Acoustical Society of America, 124 (4). pp. 2011-2020. ISSN 0001-4966.

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The shock-induced collapse of a pre-existing nucleus near a solid surface in the focal region of a lithotripter is investigated. The entire flow field of the collapse of a single gas bubble subjected to a lithotripter pulse is simulated using a high-order accurate shock- and interface-capturing scheme, and the wall pressure is considered as an indication of potential damage. Results from the computations show the same qualitative behavior as that observed in experiments: a re-entrant jet forms in the direction of propagation of the pulse and penetrates the bubble during collapse, ultimately hitting the distal side and generating a water-hammer shock. As a result of the propagation of this wave, wall pressures on the order of 1 GPa may be achieved for bubbles collapsing close to the wall. The wall pressure decreases with initial stand-off distance and pulse width and increases with pulse amplitude. For the stand-off distances considered in the present work, the wall pressure due to bubble collapse is larger than that due to the incoming shockwave; the region over which this holds may extend to ten initial radii. The present results indicate that shock-induced collapse is a mechanism with high potential for damage in shockwave lithotripsy.

Item Type:Article
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URLURL TypeDescription
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2008 Acoustical Society of America. (Received 23 April 2008; revised 18 July 2008; accepted 21 July 2008) The authors gratefully acknowledge helpful discussions with members of the PPG group (PI Andrew Evan), in particular, Dr. Michael Bailey, Dr. Robin Cleveland, Dr. Wayne Kreider, Dr. Yura Pishchalnikov, and Dr. Oleg Sapozhnikov. This work was supported by NIH Grant No. PO1 DK043881 and by ONR Grant No. N00014-06-1-0730.
Funding AgencyGrant Number
NIHPO1 DK043881
Office of Naval Research (ONR)N00014-06-1-0730
Subject Keywords:acoustic applications; biomedical equipment; bubbles; diseases; jets; kidney; patient treatment; shock waves
Issue or Number:4
Record Number:CaltechAUTHORS:JOHjasa08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12217
Deposited By: Archive Administrator
Deposited On:29 Oct 2008 20:35
Last Modified:03 Oct 2019 00:26

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