Basic investigation of laser therapy for the ureteral stricture using ultraviolet argon laser and multifiber catheter

Yuichiro Daidoh M.D.; Tsunenori Arai; Masaru Murai M.D.; Akira Suda; Makoto Kikuchi; Hiroshi Nakamura M.D.; Yukikuni Komime; Atsushi Utsumi

doi:10.1117/12.137323

1 June 1992 Basic investigation of laser therapy for the ureteral stricture using ultraviolet argon laser and multifiber catheter

Yuichiro Daidoh M.D., Tsunenori Arai, Masaru Murai M.D., Akira Suda, Makoto Kikuchi, Hiroshi Nakamura M.D., Yukikuni Komime, Atsushi Utsumi

Author Affiliations +

Proceedings Volume 1643, Laser Surgery: Advanced Characterization, Therapeutics, and Systems III; (1992) https://doi.org/10.1117/12.137323
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

In order to develop new, easy, and safe treatment for urinary tract stricture, we investigated the laser plasty using a combination of an uv Ar laser for ablation and a novel multi-fiber catheter for laser delivery. To investigate the characteristics of the uv Ar laser ablation to ureteral tissue, the experiment in vitro was performed. The ureter was clearly ablated with sufficient thin coagulation layer. The proper laser power for the tissue ablation was about 0.5 W for 0.4 mm core-diameter fiber. The multi-fiber catheter (1.6 mm in outer diameter) consisted of 13 pixels of silica glass fibers (0.2 mm in core diameter) for laser delivery and a through lumen (0.9 mm in inner diameter) for guidewire. The catheter was inserted into a canine ureter under the general anesthesia. The ureter and urinary tract were irradiated using about 0.6 W of laser power at the catheter tip with 40s duration. The irradiated urinary tract tissues were histologically investigated. The ureter was ablated up to the submucosa layer. The urinary tract endotherium was eliminated by the laser ablation without the carbonization. No perforation was found at various irradiation conditions. To investigate the ureteral tissue damage of the uv Ar laser irradiation, the serosa temperature was measured by a thermocouple. The temperature elevation of the serosa could be restricted up to 60 degree(s)C, at which the protein was not coagulated. We concluded that the combination of uv Ra laser and multi-fiber catheter offered easy, reliable therapy for coronary structure.

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Yuichiro Daidoh M.D., Tsunenori Arai, Masaru Murai M.D., Akira Suda, Makoto Kikuchi, Hiroshi Nakamura M.D., Yukikuni Komime, and Atsushi Utsumi "Basic investigation of laser therapy for the ureteral stricture using ultraviolet argon laser and multifiber catheter", Proc. SPIE 1643, Laser Surgery: Advanced Characterization, Therapeutics, and Systems III, (1 June 1992); https://doi.org/10.1117/12.137323

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KEYWORDS

Fiber lasers

Argon ion lasers

Laser ablation

Laser therapeutics

Laser tissue interaction

Glasses

Laser safety

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