Abstract
In in vitro and animal experiments the tissue effects of the 1.318μm Nd-YAG laser were compared to those of the standard 1.064μm Nd-YAG laser in order to evaluate the advantages of the new wavelength with a ten times higher absorption in water for gastroenterological tumour treatment. Under irradiation parameters related to clinical endoscopic practice, the laser of the wavelength 1.318μm needs for both vaporization and coagulation significantly less energy than the 1.064μm laser. Since vaporization at 1.318μm is always accompanied by a higher coagulation effect compared to 1.064μm the risk of late necrosis and resulting perforation appears to be increased.
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