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Proceedings Paper

Laser-tissue interaction of a continuous-wave 2-um, 3-um cascade oscillation fiber laser: sharp incision with controlled coagulation layer thickness
Author(s): Tsunenori Arai; Tetsumi Sumiyoshi; Kyota Naruse; Miya Ishihara; Shunichi Sato; Makoto Kikuchi; Tadashi Kasamatsu; Hitoshi Sekita; Minoru Obara
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Paper Abstract

We studied coagulation layer controlled incision with newly developed continuous wave 2 micrometer, 3 micrometer cascade oscillation fiber laser in vitro. Since this laser device simultaneously oscillates 2 micrometer and 3 micrometer radiation, we could change tissue interaction by arranging power ratio of 2 micrometer to 3 micrometer radiation. About one watt of total irradiation power with various power ratios was focused to extracted fresh porcine myocardium or anesthetized rabbit on an automatic moving stage to obtain line incision. Macro photograph and microscopic histology were used to observe tissue interaction phenomenon. The incised specimen showed that precise cutting groove with thin coagulation layer was attained by a 3 micrometer based radiation, meanwhile addition of 2 micrometer radiation to 3 micrometer radiation made coagulation layer thicker. A heat conduction simulator using finite-element method was used to qualitatively explain obtained coagulation layer thickness. This precise incision with controllable side coagulation layer may effective to control bleeding during incision, for instance, for skin, liver, and kidney incisions. Pure continuous wave radiation of 2 micrometer and 3 micrometer may eliminate stress wave induced tissue damage which is frequently found in Ho:YAG and/or Er:YAG tissue interactions. Moreover, sapphire fiber might offer flexible power delivery to this new laser to establish endoscopic application and/or to improved beam handling.

Paper Details

Date Published: 13 June 2000
PDF: 8 pages
Proc. SPIE 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, (13 June 2000); doi: 10.1117/12.388052
Show Author Affiliations
Tsunenori Arai, National Defense Medical College (Japan)
Tetsumi Sumiyoshi, NEC Corp. (Japan)
Kyota Naruse, Keio Univ. (Japan)
Miya Ishihara, National Defense Medical College (Japan)
Shunichi Sato, National Defense Medical College Research Institute (Japan)
Makoto Kikuchi, National Defense Medical College (Japan)
Tadashi Kasamatsu, NEC Corp. (Japan)
Hitoshi Sekita, NEC Corp. (Japan)
Minoru Obara, Keio Univ. (Japan)

Published in SPIE Proceedings Vol. 3914:
Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical
Jeffrey O. Hollinger D.D.S.; Donald Dean Duncan; Jeffrey O. Hollinger D.D.S.; Donald Dean Duncan; Steven L. Jacques, Editor(s)

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