Microlesion healing dynamics in in vivo porcine skin after treatment with 1064 nm picosecond‐domain Nd:YAG laser

Abstract

AbstractThe fractionated picosecond laser produces microscopic lesions in the epidermis and dermis due to laser‐induced optical breakdown (LIOB). There have been multiple histological reports, but the present literature lacks detailed in vivo studies after treatment with high‐power laser systems. Our study aimed to characterize the healing patterns of microlesions induced with 150 ps duration 1064 nm MLA‐type picosecond laser. The induced picosecond laser‐tissue reactions with pulse energy of 50–250 mJ and different treatment modes were observed in in vivo porcine skin model over 10 days after the laser procedure. A macroscopic evaluation was combined with microscopic histological analysis to observe the healing dynamics of laser‐induced microlesions. Superficial, intraepidermal cavitation bubbles were induced using microbeam fluence of 4–20 J/cm2. Skin irritation scores positively correlated with pulse energy and dose. Our findings demonstrate that dose and pulse energy had a direct impact on epidermal thickness and lesions healing dynamics.