To improve the efficacy of extracorporeal shock wave lithotripsy (ESWL) treatment, it is desirable to identify the physical properties of urinary calculi could offer direct correlation with their fragilities during ESWL and thus could be used to guide treatment procedures for more effective stone fragmentation. Thirty stone specimens removed surgically were compressed by an axial testing system to measure the compressive strength and trace the stress-strain curve. Image analysis software SigmaScan (Jandel Co.) was used to calculate the area under the stress-strain curve, the modulus of toughness, for each stone. The values of compressive strength measured were similar to those reported by other researchers. The modulus of toughness of urinary calculi correlates with clinical representation of the stone fragility during ESWL. The modulus of toughness could be an index to evaluate the physical property of urinary calculi that could be used to guide treatment procedures for more effective stone fragmentation.
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February 2002
Technical Briefs
The Modulus of Toughness of Urinary Calculi
Shyh-Jen Wang,
Shyh-Jen Wang
Division of Experimental Surgery, Department of Surgery Veterans General Hospital-Taipei, Taiwan, R.O.C.
Institute of Biomedical Engineering, National Yang-Ming University, No. 201 Section II, Shih-Pai road, Taipei 11217, Taiwan, R.O.C.
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Ming-Chuen Yip,
Ming-Chuen Yip
Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan, R.O.C.
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Yen-Shen Hsu,
Yen-Shen Hsu
Division of Urology, Department of Surgery, Veterans General Hospital-Taipei, Taiwan, R.O.C.
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Kun-Guo Lai,
Kun-Guo Lai
Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan, R.O.C.
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Shyh-Yau Wang
Shyh-Yau Wang
University of Houston, Houston, TX
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Shyh-Jen Wang
Division of Experimental Surgery, Department of Surgery Veterans General Hospital-Taipei, Taiwan, R.O.C.
Institute of Biomedical Engineering, National Yang-Ming University, No. 201 Section II, Shih-Pai road, Taipei 11217, Taiwan, R.O.C.
Ming-Chuen Yip
Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan, R.O.C.
Yen-Shen Hsu
Division of Urology, Department of Surgery, Veterans General Hospital-Taipei, Taiwan, R.O.C.
Kun-Guo Lai
Department of Power Mechanical Engineering, National Tsing Hua University, Taiwan, R.O.C.
Shyh-Yau Wang
University of Houston, Houston, TX
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division Mar. 13, 2001; revised manuscript received Aug. 31, 2001. Associate Editor: C. H. Turner.
J Biomech Eng. Feb 2002, 124(1): 133-134 (2 pages)
Published Online: August 31, 2001
Article history
Received:
March 13, 2001
Revised:
August 31, 2001
Citation
Wang , S., Yip , M., Hsu , Y., Lai , K., and Wang , S. (August 31, 2001). "The Modulus of Toughness of Urinary Calculi ." ASME. J Biomech Eng. February 2002; 124(1): 133–134. https://doi.org/10.1115/1.1431264
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