Infrared glass fiber cables for CO laser medical applications

Tsunenori Arai; Kyoichi Mizuno; Koji Sensaki M.D.; Makoto Kikuchi; Tamishige Watanabe; Atsushi Utsumi; Kiyoshi Takeuchi; Yoshiro Akai

doi:10.1117/12.146334

28 May 1993 Infrared glass fiber cables for CO laser medical applications

Tsunenori Arai, Kyoichi Mizuno, Koji Sensaki M.D., Makoto Kikuchi, Tamishige Watanabe, Atsushi Utsumi, Kiyoshi Takeuchi, Yoshiro Akai

Author Affiliations +

Proceedings Volume 1893, Optical Fibers in Medicine VIII; (1993) https://doi.org/10.1117/12.146334
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

We developed the medical fiber cables which were designed for CO laser therapy, i.e., angioplasty and endoscopic therapy. As-S chalcogenide glass fibers were used for CO laser delivery. A 230 micrometers core-diameter fiber was used for the angioplasty laser cable. The outer diameter of this cable was 600 micrometers . The total length and insertion length of the angioplasty laser cable were 2.5 m and 1.0 m, respectively. Typically, 2.0 W of fiber output was used in the animal experiment in vivo for the ablation of the model plaque which consisted of human atheromatous aorta wall. The transmission of the angioplasty laser cable was approximately 35%, because the reflection loss occurred at both ends of the fiber and window. Meanwhile, the core diameter of the energy delivery fiber for the endoscopic therapy was 450 micrometers . The outer diameter of this cable was 1.7 mm. Approximately 4.5 W of fiber output was used for clinical treatment of pneumothorax through a pneumoscope. Both types of the cables had the ultra-thin thermocouples for temperature monitoring at the tip of the cables. This temperature monitoring was extremely useful to prevent the thermal destruction of the fiber tip. Moreover, the As-S glass fibers were completely sealed by the CaF₂ windows and outer tubes. Therefore, these cables were considered to have sufficient safety properties for medical applications. These laser cables were successfully used for the in vivo animal experiments and/or actual clinical therapies.

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Tsunenori Arai, Kyoichi Mizuno, Koji Sensaki M.D., Makoto Kikuchi, Tamishige Watanabe, Atsushi Utsumi, Kiyoshi Takeuchi, and Yoshiro Akai "Infrared glass fiber cables for CO laser medical applications", Proc. SPIE 1893, Optical Fibers in Medicine VIII, (28 May 1993); https://doi.org/10.1117/12.146334

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