Laser-tissue interaction of a continuous-wave 2-um, 3-um cascade oscillation fiber laser: sharp incision with controlled coagulation layer thickness

Tsunenori Arai; Tetsumi Sumiyoshi; Kyota Naruse; Miya Ishihara; Shunichi Sato; Makoto Kikuchi; Tadashi Kasamatsu; Hitoshi Sekita; Minoru Obara

doi:10.1117/12.388052

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13 June 2000 Laser-tissue interaction of a continuous-wave 2-μm, 3-μm cascade oscillation fiber laser: sharp incision with controlled coagulation layer thickness

Tsunenori Arai, Tetsumi Sumiyoshi, Kyota Naruse, Miya Ishihara, Shunichi Sato, Makoto Kikuchi, Tadashi Kasamatsu, Hitoshi Sekita, Minoru Obara

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Proceedings Volume 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical; (2000) https://doi.org/10.1117/12.388052
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

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.

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Tsunenori Arai, Tetsumi Sumiyoshi, Kyota Naruse, Miya Ishihara, Shunichi Sato, Makoto Kikuchi, Tadashi Kasamatsu, Hitoshi Sekita, and Minoru Obara "Laser-tissue interaction of a continuous-wave 2-μm, 3-μm cascade oscillation fiber laser: sharp incision with controlled coagulation layer thickness", Proc. SPIE 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, (13 June 2000); https://doi.org/10.1117/12.388052

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