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Proceedings Paper

Low-cost 420nm blue laser diode for tissue cutting and hemostasis
Author(s): Kurt J. Linden
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Paper Abstract

This paper describes the use of a 420 nm blue laser diode for possible surgery and hemostasis. The optical absorption of blood-containing tissue is strongly determined by the absorption characteristics of blood. Blood is primarily comprised of plasma (yellowish extracellular fluid that is approximately 95% water by volume) and formed elements: red blood cells (RBCs), white blood cells (WBCs) and platelets. The RBCs (hemoglobin) are the most numerous, and due to the spectral absorption characteristics of hemoglobin, the optical absorption of blood has a strong relative maximum value in the 420 nm blue region of the optical spectrum. Small, low-cost laser diodes emitting at 420 nm with tens of watts of continuous wave (CW) optical power are becoming commercially available. Experiments on the use of such laser diodes for tissue cutting with simultaneous hemostasis were carried out and are here described. It was found that 1 mm deep x 1 mm wide cuts can be achieved in red meat at a focused laser power level of 3 W moving at a velocity of ~ 1 mm/s. The peripheral necrosis and thermal damage zone extended over a width of approximately 0.5 mm adjacent to the cuts. Preliminary hemostasis experiments were carried out with fresh equine blood in Tygon tubing, where it was demonstrated that cauterization can occur in regions of intentional partial tubing puncture.

Paper Details

Date Published: 7 March 2016
PDF: 7 pages
Proc. SPIE 9706, Optical Interactions with Tissue and Cells XXVII, 97060E (7 March 2016); doi: 10.1117/12.2208315
Show Author Affiliations
Kurt J. Linden, N2 Biomedical LLC (United States)

Published in SPIE Proceedings Vol. 9706:
Optical Interactions with Tissue and Cells XXVII
E. Duco Jansen, Editor(s)

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