Renal stone comminution utilizing cloud cavitation erosion (1st report, the control of cloud cavitation)

Teiichiro Ikeda, Shin Yoshizawa, Masataka Tosaki, Yukio Kaneko, Shu Takagi, Yoichiro Matsumoto

Research output: Contribution to journalArticle

Abstract

In a therapeutic ultrasound field, cavitation frequently forms a bubble cloud that consists of many microbubbles. A method to control the violent collapse of cloud cavitation is being developed. It is comprised of two frequency ultrasound forcing. The first is a higher frequency ultrasound waveform that makes cloud cavitation at the surface of the object. The second is a lower frequency waveform that produces a violent collapse of the cloud cavitation. If the phenomena is well controlled in time and space, it can be utilized for the stone crushing mechanism in lithotripsy. From a numerical simulation, the controllability of the cloud cavitation is predicted. A stable bubble cloud at the solid surface and the shock wave from the violent cloud cavitation collapse are observed by using a high-speed photography. The occurrence time of the collapsing phenomena of cloud cavitation is controlled within 100 ns and the area is controlled within several hundreds micrometers. Using the present method, stones are chipped away such that scoop-like indentations are achieved.

Original languageEnglish
Pages (from-to)904-911
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume70
Issue number692
DOIs
Publication statusPublished - 2004 Apr
Externally publishedYes

Keywords

  • Bubble Cloud
  • Cavitation
  • Erosion
  • Lithotripsy
  • Shock Wave

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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