Cw high-power IR laser at 2 µm for minimally invasive surgery

Dirk Theisen; Verena Ott; Heinz-Wolfram Bernd; Veit Danicke; Robert Keller; Ralf Brinkmann

doi:10.1117/12.500624

16 October 2003 Cw high-power IR laser at 2 μm for minimally invasive surgery

Dirk Theisen, Verena Ott, Heinz-Wolfram Bernd, Veit Danicke, Robert Keller, Ralf Brinkmann

Proceedings Volume 5142, Therapeutic Laser Applications and Laser-Tissue Interactions; (2003) https://doi.org/10.1117/12.500624
Event: European Conferences on Biomedical Optics 2003, 2003, Munich, Germany

Abstract

The potential of a new continuous wave Thulium YAG laser is investigated for tissue ablation and cutting focusing on applications in minimally invasive surgery. The laser emits at a wavelength of 2.01μm, which is well suited for tissue ablation due to its high absorption by water. The laser power can be tuned up to 60 W output through a 365 μm core diameter quartz fibre. For the ablation studies, the quartz fibre was placed in contact under various pressures (20 to 90mN) to porcine liver under saline solution in vitro at angles varying between 30° to 60°. The influence of different powers (10 to 60W) and cutting velocities (2 to 10mm/s) on the incision depth and coagulation zones of the tissue were investigated. A maximum incision depth of 3.3 mm was found with a power of 60W, a cutting velocity of 2mm/s and a fibre-tissue angle of 45°. The incisions were surrounded by coagulated tissue between 0.4 and 0.8mm in thickness, sometimes with an inner zone of carbonization of 0.2mm on average. In conclusion, the first experiments show that a cw Thulium laser is very well suited for tissue dissection as required in minimally invasive surgery.

Citation Download Citation

Dirk Theisen, Verena Ott, Heinz-Wolfram Bernd, Veit Danicke, Robert Keller, and Ralf Brinkmann "Cw high-power IR laser at 2 μm for minimally invasive surgery", Proc. SPIE 5142, Therapeutic Laser Applications and Laser-Tissue Interactions, (16 October 2003); https://doi.org/10.1117/12.500624

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