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Proceedings Paper

Air leak seal for lung dissection plane with diode laser irradiation: an ex-vivo study
Author(s): Maya Gotoh; Hisako Tokunaga; Kenji Kaneko; Tsunenori Arai
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Paper Abstract

In order to seal air leak from lung dissection plane in thoracotomy, we studied diode laser irradiation (wavelength: 810nm) with surface stain of indocyanine green (ICG, peak absorption wavelength: 805nm) ex vivo. In general, this air leak is sealed by suturing with weak tension and large margin of parenchyma. This suturing requires surgeon's skill and takes long time. Moreover, lung ventilatory performance is significantly impaired. Since laser tissue welding is novel method to adhere living tissue with thin thermally denatured attachment layer, we propose to seal the lung dissection plane with laser irradiation. Our aim of this study is to investigate the sealing mechanism as well as optimum condition to develop reliable laser sealing method for dissected lung plane in surgery, using practical laser-dye combination. Compartment of extracted porcine lung was prepared as a lung model, which volume was approximately 60cm^3. ICG solution (2.5mg/ml) was applied to the dissection plane of this lung model with 1minute. The diode laser (power density: 8-40W/cm^2) irradiated to the plane, moving the laser spot with constant speed (v=1mm/s). The heat degeneration depth and smoothness of the laser irradiated surface were observed by a microscope. When power density was over 24W/cm^2, heat degeneration depth was over 1.5E-4 m. There were no pin holes on the surface and the air leak seemed to be sealed completely. We also evaluated the air leak by endotracheal pressure. In the case of above condition, the heat degeneration depth was the same that of previous reported result with CO2 laser.

Paper Details

Date Published: 21 February 2007
PDF: 5 pages
Proc. SPIE 6435, Optical Interactions with Tissue and Cells XVIII, 64350G (21 February 2007); doi: 10.1117/12.701476
Show Author Affiliations
Maya Gotoh, Keio Univ. (Japan)
Hisako Tokunaga, Keio Univ. (Japan)
Kenji Kaneko, Keio Univ. (Japan)
Tsunenori Arai, Keio Univ. (Japan)

Published in SPIE Proceedings Vol. 6435:
Optical Interactions with Tissue and Cells XVIII
Steven L. Jacques; William P. Roach, Editor(s)

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