Comparison of the pulsed dye and holmium lasers for stone              fragmentation: in-vitro studies and clinical experience

Graham M. Watson M.D.; Neil Smith

doi:10.1117/12.169530

28 May 1993 Comparison of the pulsed dye and holmium lasers for stone fragmentation: in-vitro studies and clinical experience

Graham M. Watson M.D., Neil Smith

Author Affiliations +

Proceedings Volume 1879, Lasers in Urology, Gynecology, and General Surgery; (1993) https://doi.org/10.1117/12.169530
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

Citation Download Citation

Graham M. Watson M.D. and Neil Smith "Comparison of the pulsed dye and holmium lasers for stone fragmentation: in-vitro studies and clinical experience", Proc. SPIE 1879, Lasers in Urology, Gynecology, and General Surgery, (28 May 1993); https://doi.org/10.1117/12.169530

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