Research on the Effect of Dual-Beam Laser Process Parameters on the Mechanical Properties and Thermal Damage of Skin Tissue Welding.

Surgical incision closure and trauma repair are critical in surgery. Dual-beam laser tissue welding achieves full-layer skin tissue connection with minimal thermal damage via selective absorption of different laser wavelengths. This study investigates the impacts of laser scanning speed, spot spacing, and deflection angle on mechanical properties and thermal damage of skin tissues to optimize parameters. Through incision morphology observation, tensile strength tests, thermal denaturation analysis, and microtissue quantitative characterization, the optimal process parameters were obtained. Results show that tensile strength and thermal denaturation degree increase with scanning speed, exhibit a cyclic decreasing pattern with spot spacing, and significantly improve with deflection angle. When V = 200 mm/s, D = 0.5 mm, and θ = 60°, the incision achieves the highest connection strength, best thermal damage control, and overall performance. These findings provide technical references and data support for refined parameter models in vivo tests.