Transient cavitation and acoustic emission produced by different laser lithotripters

Pei Zhong, Hon Leung Tong, Franklin Hadley Cocks, Margaret S Pearle, Glenn M. Preminger

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Transient cavitation and shockwave generation produced by pulsed-dye and holmium:YAG laser lithotripters were studied using high-speed photography and acoustic emission measurements. In addition, stone phantoms were used to compare the fragmentation efficiency of various laser and electrohydraulic lithotripters. The pulsed-dye laser, with a wavelength (504 nm strongly absorbed by most stone materials but not by water, and a short pulse duration of ~1 μsec, induces plasma formation on the surface of the target calculi. Subsequently, the rapid expansion of the plasma forms a cavitation bubble, which expands spherically to a maximum size and then collapses violently, leading to strong shockwave generation and microjet impingement, which comprises the primary mechanism for stone fragmentation with short-pulse lasers. In contrast, the holmium laser, with a wavelength (2100 nm) most strongly absorbed by water as well as by all stone materials and a long pulse duration of 250 to 350 μsec, produces an elongated, pear-shaped cavitation bubble at the tip of the optical fiber that forms a vapor channel to conduct the ensuing laser energy to the target stone (Moss effect). The expansion and subsequent collapse of the elongated bubble is asymmetric, resulting in weak shockwave generation and microjet impingement. Thus, stone fragmentation in holmium laser lithotripsy is caused primarily by thermal ablation (drilling effect).

Original languageEnglish (US)
Pages (from-to)371-378
Number of pages8
JournalJournal of Endourology
Volume12
Issue number4
StatePublished - Aug 1998

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Solid-State Lasers
Acoustics
Lasers
Laser Lithotripsy
Dye Lasers
Bryophyta
Optical Fibers
Pyrus
Water
Photography
Calculi
Coloring Agents
Hot Temperature

ASJC Scopus subject areas

  • Urology

Cite this

Zhong, P., Tong, H. L., Cocks, F. H., Pearle, M. S., & Preminger, G. M. (1998). Transient cavitation and acoustic emission produced by different laser lithotripters. Journal of Endourology, 12(4), 371-378.

Transient cavitation and acoustic emission produced by different laser lithotripters. / Zhong, Pei; Tong, Hon Leung; Cocks, Franklin Hadley; Pearle, Margaret S; Preminger, Glenn M.

In: Journal of Endourology, Vol. 12, No. 4, 08.1998, p. 371-378.

Research output: Contribution to journalArticle

Zhong, P, Tong, HL, Cocks, FH, Pearle, MS & Preminger, GM 1998, 'Transient cavitation and acoustic emission produced by different laser lithotripters', Journal of Endourology, vol. 12, no. 4, pp. 371-378.
Zhong, Pei ; Tong, Hon Leung ; Cocks, Franklin Hadley ; Pearle, Margaret S ; Preminger, Glenn M. / Transient cavitation and acoustic emission produced by different laser lithotripters. In: Journal of Endourology. 1998 ; Vol. 12, No. 4. pp. 371-378.
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