Infrared glass fiber cables for CO laser medical applications

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


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 μm core-diameter fiber was used for the angioplasty laser cable. The outer diameter of this cable was 600 μm. 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 μm. 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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Int Soc for Optical Engineering
Number of pages6
ISBN (Print)0819411205
Publication statusPublished - 1993 Jan 1
EventOptical Fibers in Medicine VIII - Los Angeles, CA, USA
Duration: 1993 Jan 191993 Jan 20

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptical Fibers in Medicine VIII
CityLos Angeles, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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