Abstract
The intense shock waves that are used for stone disintegration in ESWL can readily produce acoustic cavitation in a variety of liquids. It has been discovered that the damage to metal objects placed at the focus of an ESWL can be attributed to the action of liquid microjets produced by collapsing cavitation bubbles [A. J. Coleman et al., Ultrasound Med. Biol. 13, 69–76 (1987)]. Furthermore, Delius has shown that these shock waves can produce cavitation in vivo [Miller et al., J. Acoust. Soc. Am. Suppl. 1 83, S89 (1988)]. In this paper, a general review will be given of the mechanism of microjet formation in cavitation bubbles and arguments made that cavitation plays an important role in stone disintegration. A film will be shown of microjet formation in collapsing cavitation bubbles induced at low acoustic frequencies. [Work supported in part by NIH and ONR.]
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