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Proceedings Paper

Microsurgery of ureteral strictures using pulsed mid-IR lasers
Author(s): Ralf Brinkmann; Ansgar Knipper; Gerit Droege; Ado Miller; Bernd Gromoll; Reginald Birngruber
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Paper Abstract

Efficiency and precision of intraluminal laser incisions of soft tissue were investigated particularly for reopening ureteral strictures. We used mid-IR laser radiation and an application system which nearly tangentially performed the contact incision via a low-OH quartz fiber to achieve a longitudinal cut through the whole ureter wall up to the periureteral fat tissue. With pulsed Holmium and Thulium laser radiation we investigated in vitro (using the model of pig ureters) the cutting efficiency and coagulation zone with respect to laser power, pulse length, cutting speed and fiber diameter. The thermo-mechanical mechanism of tissue ablation was evaluated by fast flash photography showing a growing influence of the cavitation bubble towards shorter pulse lengths. In a first clinical study 14 patients underwent the laser therapy. We used the Holmium laser in the free running mode at a pulse repetition rate of 10 Hz and with an average power of 3 W at the end of a 300 micrometers fiber. The reopening of the stenoses took about 19 min. with an average laser energy of 819 J applied. The whole procedure was observed by videoscopy. No bleeding could be seen and no complications during the laser treatment occurred.

Paper Details

Date Published: 18 January 1995
PDF: 8 pages
Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); doi: 10.1117/12.199245
Show Author Affiliations
Ralf Brinkmann, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Ansgar Knipper, Medizinischen Univ. zu Luebeck (Germany)
Gerit Droege, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Ado Miller, Medizinisches Laserzentrum Luebeck GmbH (Germany)
Bernd Gromoll, Medizinischen Univ. zu Luebeck (Germany)
Reginald Birngruber, Medizinisches Laserzentrum Luebeck GmbH (Germany)

Published in SPIE Proceedings Vol. 2323:
Laser Interaction with Hard and Soft Tissue II
Hans Joerg Albrecht; Guy P. Delacretaz; Thomas H. Meier; Rudolf W. Steiner; Lars Othar Svaasand; Martin J. C. van Gemert, Editor(s)

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