Thulium fiber laser damage to the ureter

Christopher R. Wilson; Luke A. Hardy; Pierce B. Irby M.D.; Nathaniel M. Fried

doi:10.1117/12.2182973

15 July 2015 Thulium fiber laser damage to the ureter

Christopher R. Wilson, Luke A. Hardy, Pierce B. Irby M.D., Nathaniel M. Fried

Proceedings Volume 9542, Medical Laser Applications and Laser-Tissue Interactions VII; 95420C (2015) https://doi.org/10.1117/12.2182973
Event: European Conferences on Biomedical Optics, 2015, Munich, Germany

Abstract

Our laboratory is studying experimental thulium fiber laser (TFL) as a potential alternative lithotripter to the clinical gold standard Holmium:YAG laser. Safety studies characterizing undesirable Holmium laser-induced damage to ureter tissue have been previously reported. Similarly, this study characterizes TFL induced ureter and stone basket damage. A TFL beam with pulse energy of 35 mJ, pulse duration of 500 μs, and pulse rates of 150-500 Hz was delivered through a 100-μm-core, low-OH, silica optical fiber to the porcine ureter wall, in vitro. Ureter perforation times were measured and gross, histological, and optical coherence tomography images of the ablation zone were acquired. TFL operation at 150, 300, and 500 Hz produced mean ureter perforation times of 7.9, 3.8, and 1.8 s, respectively. Collateral damage averaged 510, 370, and 310 μm. TFL mean perforation time exceeded 1 s at each setting, which is a greater safety margin than previously reported during Holmium laser ureter perforation studies.

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Christopher R. Wilson, Luke A. Hardy, Pierce B. Irby M.D., and Nathaniel M. Fried "Thulium fiber laser damage to the ureter", Proc. SPIE 9542, Medical Laser Applications and Laser-Tissue Interactions VII, 95420C (15 July 2015); https://doi.org/10.1117/12.2182973

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KEYWORDS

Fiber lasers

YAG lasers

Laser ablation

Holmium

Safety

Tissues

Laser tissue interaction

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