Optimized Distance Holders Improve Precision in Fractional Laser Treatment

作者：Aditi Maheshwari, Nelson Manstein, John Warner‐Levy, Alexander Warner‐Levy, Connor M. Alfonso, Abigail E. Doyle, Michael Evers · 发表于：Lasers in Surgery and Medicine · 年份：2025 · DOI：10.1002/lsm.70050 · 被引用次数：1 · 研究领域：Optical Coherence Tomography Applications、Laser Applications in Dentistry and Medicine、Dermatologic Treatments and Research

ABSTRACT Background Fractional Photothermolysis (FP) relies on precise laser focus to create microscopic treatment zones (MTZs). Focal plane deviations, caused by handpiece pressure and movement, shift the treated tissue out of focus, increasing spot size and reducing lesion depth, compromising treatment efficacy. This study investigates an optimized spacer to mitigate load‐induced deviations and improve clinical outcomes. Methods A difference frequency generation (DFG) laser system (IPG Medical) with 3050/3200 nm wavelength treated ex vivo human abdominoplasty skin, mounted on a load‐adjustable platform (0–1000 g, ±0.1 g). Tissue was treated at 5 mJ/pulse with a nominal spot size of 40 µm using spacers ranging from 2 × 2 mm 2 to 8 × 8 mm 2 and an optimized 2 × 2 mm 2 grid spacer. Optical coherence tomography measured skin bulging and focal plane deviations, while histological analysis validated lesion depth and diameter. Knife‐edge technique projections were used to assess theoretical beam behavior. Results Applied load caused skin bulging, resulting in a linear increase in lesion diameter and a linear decrease in depth. Smaller spacers (2 × 2 mm 2 ) reduced focal deviations and maintained MTZ precision within the Rayleigh range. 2 × 2 mm 2 grid spacers further reduced bulging by redistributing the load and ensuring more uniform MTZ formation. Conclusion Load‐induced focal shifts significantly impact FP efficiency, particularly on nonuniform skin surfaces. An optimized space...