CO2 Fractional Laser Induced Skin Micro-Tunnel Thermal Damage Patterns: A Simulation Study

Area of Science:

• Biomedical Engineering
• Dermatology
• Laser Physics

Background:

• Fractional CO2 lasers create micro-tunnels for rejuvenation and drug delivery.
• Understanding heat distribution and thermal damage is crucial for optimizing laser treatments.
• Minimizing collateral thermal damage is essential for safe and effective laser procedures.

Purpose of the Study:

• To simulate heat distribution and thermal damage models for CO2 fractional lasers.
• To optimize laser parameters (size, pulse duration, power) for improved drug delivery applications.
• To evaluate the impact of different laser settings on tissue preservation.

Main Methods:

• Utilized COMSOL Multiphysics software for thermal modeling.
• Modeled skin as three homogeneous layers: epidermis, dermis, and hypodermis.
• Defined parameters including 0.07 mm spot size, 10-15 W power, and 0.5-15 ms pulse durations.

Main Results:

• 10 W power with varied pulse durations yielded optimal micro-tunnels with minimal injury.
• Higher power (>15 W) and short pulses (e.g., 5 pulses) led to significant tissue damage.
• Increased pulse duration at 10 W power reduced surrounding tissue damage.

Conclusions:

• CO2 fractional lasers induce micro-tunnels via absorbed light and heat generation.
• Greater spacing between micro-tunnels correlates with better tissue preservation.
• COMSOL software shows promise for preclinical laser treatment optimization.