Modeling the thermal response of porcine cartilage to laser irradiation

Sergio H. Diaz-Valdes; Guillermo Aguilar; Reshmi Basu; Enrique J. Lavernia; Brian Jet-Fei Wong M.D.

doi:10.1117/12.472507

27 June 2002 Modeling the thermal response of porcine cartilage to laser irradiation

Sergio H. Diaz-Valdes, Guillermo Aguilar, Reshmi Basu, Enrique J. Lavernia, Brian Jet-Fei Wong M.D.

Proceedings Volume 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical; (2002) https://doi.org/10.1117/12.472507
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

Cartilage laser thermoforming, also known as laser reshaping, is a new surgical procedure that allows in-situ treatment of deformities in the head and neck with less morbidity than traditional approaches. During laser irradiation, cartilage becomes sufficiently subtle or deformable for stretching and shaping into new stable configurations. This study describes the experimental and theoretical characterization of the thermal response of porcine cartilage to laser irradiation (Nd:YAG). The surface temperature history of cartilage specimens was monitored during heating and thermal relaxation; using laser exposure times ranging between 1 and 15 s and laser powers of 1 to 10 W. The experimental results were then used to validate a finite element model, which accounts for heat diffusion, light propagation in tissue, and heat loss due to water evaporation. The simultaneous solution of the energy and mass diffusion equations resulted in predictions of temperature distribution in cartilage that were in good agreement with experiments. The model simulations will provide insights to the relationship between the laser treatment parameters (exposure time, laser beam diameter, and power) and the onset of new molecular arrangements and cell thermal injury in the material, thus conceiving basic guidelines of laser thermoforming.

Citation Download Citation

Sergio H. Diaz-Valdes, Guillermo Aguilar, Reshmi Basu, Enrique J. Lavernia, and Brian Jet-Fei Wong M.D. "Modeling the thermal response of porcine cartilage to laser irradiation", Proc. SPIE 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, (27 June 2002); https://doi.org/10.1117/12.472507

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