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Shock Wave Lithotripters With Broad Focus Result in Greater Stress in Human Kidney Stones: Numerical Simulation

[+] Author Affiliations
Haibiao Luo, Robin O. Cleveland

Boston University, Boston, MA

James C. Williams, Jr.

Indiana University, Indianapolis, IN

Paper No. BioMed2008-38093, pp. 17-18; 2 pages
doi:10.1115/BioMed2008-38093
From:
  • ASME 2008 3rd Frontiers in Biomedical Devices Conference
  • ASME 2008 3rd Frontiers in Biomedical Devices Conference
  • Irvine, California, USA, June 18–20, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4833-7 | eISBN: 0-7918-3823-4
  • Copyright © 2008 by ASME

abstract

Shock wave lithotripsy (SWL) has been used to treat kidney stones for decades. However, there is growing recognition that shock waves induces trauma to kidney tissue [1, 2]. The poor understanding of stone comminution mechanisms means that the design of new lithotripters is principally a practice of empiricism [3]. A mechanistic understanding of stone comminution would provide a criterion to develop new lithotripsy systems. In this work, a three-dimensional finite-difference time-domain (FDTD) solution to the linear elastic equations was employed [4] to investigate the stress and displacement fields of kidney stones subject to lithotripsy shock waves. The kidney stone models were obtained from micro-computed tomography images (resolution of 20 μm) and have diameters from 2 mm to 5 mm.

Copyright © 2008 by ASME

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