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Proceedings Paper

Basic investigation of laser therapy for the ureteral stricture using ultraviolet argon laser and multifiber catheter
Author(s): Yuichiro Daidoh M.D.; Tsunenori Arai; Masaru Murai M.D.; Akira Suda; Makoto Kikuchi; Hiroshi Nakamura M.D.; Yukikuni Komime; Atsushi Utsumi
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Paper 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.

Paper Details

Date Published: 1 June 1992
PDF: 5 pages
Proc. SPIE 1643, Laser Surgery: Advanced Characterization, Therapeutics, and Systems III, (1 June 1992); doi: 10.1117/12.137323
Show Author Affiliations
Yuichiro Daidoh M.D., National Defense Medical College (Japan)
Tsunenori Arai, National Defense Medical College (Japan)
Masaru Murai M.D., National Defense Medical College (Japan)
Akira Suda, National Defense Medical College (Japan)
Makoto Kikuchi, National Defense Medical College (Japan)
Hiroshi Nakamura M.D., National Defense Medical College (Japan)
Yukikuni Komime, Self-Defense Forces Central Hospital (Japan)
Atsushi Utsumi, Mitsubishi Cable Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 1643:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems III
R. Rox Anderson M.D., Editor(s)

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