14 January 1998 Theoretical model simulating CO2 laser ablation of biological tissue due to steam pressure generation
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CO2 lasers are among the most important lasers used for medical applications such as laser surgery. This laser is used mainly for tissue cutting and tissue removal, exploiting the high power of this laser systems and the high absorption of the biological tissue at this laser wavelength. Our research continues earlier studies conducted at the Tel Aviv University since 1987 that come out with a theoretical model used for simulating tissue irradiated with a CO2 laser beam. When examining the previous studies on laser ablation we have found that the important mechanism of steam pressure ablation was neglected. Therefore in our work we added steam pressure ablation into the model and studied the effects of this new mechanism on the tissue irradiated with a CO2 laser. The simulations results reveal that top-hat beam profile (uniformly distributed intensity) produces less thermal damage and its ablation efficiency is higher compared with standard Gaussian beam profile. We saw that the efficiency of the steam pressure ablation process is considerably higher than the purely thermal ablation process. We also noticed that the layers underneath the tissue surface are responsible for the pressure ablation.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Avi Ravid, Avi Ravid, Abraham Katzir, Abraham Katzir, } "Theoretical model simulating CO2 laser ablation of biological tissue due to steam pressure generation", Proc. SPIE 3195, Laser-Tissue Interaction, Tissue Optics, and Laser Welding III, (14 January 1998); doi: 10.1117/12.297912; https://doi.org/10.1117/12.297912

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