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Anti-miss-shot control device for selective stone disintegration in extracorporeal shock wave lithotripsy

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Abstract

A new device to prevent erroneously focused shock waves to the renal parenchyma during extracorporeal shock wave lithotripsy (ESWL) has been developed; an anti-miss-shot control device (AMCD) and experiments have been conducted to evaluate its effectiveness. For shock wave generation and stone localization, piezoceramic elements (PSE) and ultrasound localization, respectively were used. After stone localization, probing ultrasounds (PU) were emmitted from the PSE towards the focal region and the reflected sound levels (RSL) were monitored by the PSE which also functioned as a microphone. A direct hit by the PU to the stone or a miss was judged from the RSL, i.e. a high RSL indicates a direct hit and a low RSL indicates a miss. Shock waves were generated only when the RSL exceeded the level which indicated a direct hit. The experimental results showed that the injury to the renal parenchyma was decreased by using the AMCD. Clinical application of the AMCD is expected to increase the safety of ESWL.

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Authors and Affiliations

  1. Department of Urology, Tohoku University School of Medicine, Seiryo-machi, Aoba-ku, 980, Sendai, Japan

    M. Kuwahara, N. Ioritani, K. Kambe & S. Orikasa

  2. Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan

    K. Takayama

Authors
  1. M. Kuwahara
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  2. N. Ioritani
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  3. K. Kambe
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  4. S. Orikasa
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  5. K. Takayama
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This article was processed using Springer-Verlag TEX Shock Waves macro package 1990.

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Kuwahara, M., Ioritani, N., Kambe, K. et al. Anti-miss-shot control device for selective stone disintegration in extracorporeal shock wave lithotripsy. Shock Waves 1, 145–148 (1991). https://doi.org/10.1007/BF01414909

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  • DOI: https://doi.org/10.1007/BF01414909

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