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Proceedings Paper

Comparison of the pulsed dye and holmium lasers for stone fragmentation: in-vitro studies and clinical experience
Author(s): Graham M. Watson; Neil Smith
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Paper Abstract

The pulsed dye laser used with a 1 microsecond pulse duration at 504 nm delivered via a 320 micron core fiber is designed specifically for ureteric calculi. The threshold for stone fragmentation is in the region of 40 to 50 mJ for the majority of stones. Fragmentation is efficient in the 60 to 70 mJ range but for some stones 100 mJ is required. The Candela MDL 2000 (Candela Corporation) is capable of delivering 140 mJ. This laser has minimal effect on tissue. The holmium laser delivers 300 microsecond pulses of 2.1 microns wavelength (Sunrise Technologies and Coherent Ltd). A maximum of 1 J per pulse at 5 Hz is usually recommended because of the significant action on tissue. Even using this regimen significant damage can be inflicted on the ureter. In this paper the action of these two laser regimens on stones is contrasted.

Paper Details

Date Published: 28 May 1993
PDF: 4 pages
Proc. SPIE 1879, Lasers in Urology, Gynecology, and General Surgery, (28 May 1993); doi: 10.1117/12.169530
Show Author Affiliations
Graham M. Watson, Whittington Hospital and Institute of Urology (United Kingdom)
Neil Smith, Whittington Hospital (United Kingdom)

Published in SPIE Proceedings Vol. 1879:
Lasers in Urology, Gynecology, and General Surgery
Christopher J. Daly; Warren S. Grundfest; Douglas E. Johnson; Raymond J. Lanzafame; Rudolf W. Steiner; Yona Tadir; Graham M. Watson, Editor(s)

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