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Proceedings Paper

Fiber fragmentation during laser lithotripsy
Author(s): Gabriela Flemming; Ralf Brinkmann; Ch. Strunge; Ralf Engelhardt
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Paper Abstract

Laser lithotripsy (LISL) in combination with a bare fiber can lead to fragmentation of the fiber tip. Fiber fragmentation of four lithotripsy laser systems was measured under clinical conditions (calcium sulphate stone, covered with water), a Q-Switched Alexandrite laser, a pulse-stretched alexandrite laser, and two different dye lasers were used. The threshold for fiber fragmentation for pulses of Gaussian shape was 200 MW/cm2 peak power density. The Q-Switched Alexandrite laser leads to fragmentation rates of 100mm/1000 pulses at typical pulse-energies (50mJ, 150ns), whereas fiber fragmentation did not occur if dye lasers were used (80 mJ, 1.3 microsecond(s) ; 80 mJ, 2.5 microsecond(s) ) due to their longer pulse-lengths and lower power densities respectively. Using a pulse-stretched alexandrite laser fragmentation could be avoided if pulse lengths above 1 microsecond(s) were used. During LISL the fiber fragments which are produced will be embedded in the ureter wall and therefore subsequent formation of stenoses may be possible.

Paper Details

Date Published: 1 July 1991
PDF: 7 pages
Proc. SPIE 1421, Lasers in Urology, Laparoscopy, and General Surgery, (1 July 1991); doi: 10.1117/12.43922
Show Author Affiliations
Gabriela Flemming, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Ralf Brinkmann, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Ch. Strunge, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Ralf Engelhardt, Medizinisches Laserzentrum Luebeck GmbH (Germany)

Published in SPIE Proceedings Vol. 1421:
Lasers in Urology, Laparoscopy, and General Surgery
Graham M. Watson M.D.; Rudolf W. Steiner; Joseph J. Pietrafitta M.D., Editor(s)

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