Wassmer B.,Osyris Medical |
Zemmouri J.,Osyris Medical |
Rochon P.,French Institute of Health and Medical Research |
Mordon S.,French Institute of Health and Medical Research
Photomedicine and Laser Surgery | Year: 2010
Objective: This aim of this study was to evaluate the role of different wavelengths (920 nm, 980 nm, 1064 nm, 1320 nm, and 1440 nm) in laser lipolysis. Background: Laser lipolysis is fast becoming a recognized technique for fat reduction. It has been demonstrated that (i) fat liquefaction is induced through a temperature elevation of the adipocyte cells, and (ii) fat volume reduction depends on total cumulative energy delivered at the treatment site. Materials and Methods: The optical coefficients and the total attenuation for fat tissue were determined in the 400-1500 nm window. Numerical simulations were performed to estimate final fat reduction as a function of wavelength. Results: The penetration depth of wavelengths between 900 and 1320 nm are largely similar, around 1.5 mm. The only minor difference is at 1440 nm, which is more absorbed by subcutaneous fat. The irreversibly damaged volume of tissue estimated by our numerical simulation is similar for wavelengths between 920 and 1320 nm. We obtain a final volume of 4 cm3 with 3750 J delivered. Conclusion: With laser lipolysis, thermal elevation of a given volume can be obtained provided that the penetration depth remains in this nominal range. This explains why similar end results can be obtained using 920 nm, 980 nm, 1064 nm, and 1320 nm. Thermal build-up is the main factor behind adipocytolysis and skin contraction. Successful outcomes are dependent on the movement of the optical fiber inside the tissue and even and stable delivery of energy. © Copyright 2010, Mary Ann Liebert, Inc..
Rochon P.,Osyris Medical |
Mordon S.,University of Lille Nord de France
Nouvelles Dermatologiques | Year: 2010
Laser adipocytolysis or Laser Assisted Lipolysis (LAL) has become a recognized technique for treating localized fat deposits. LAL is less invasive than liposuction. LAL stimulates collagen formation, enhances skin elasticity and promotes skin contraction. It can also be used as a complementary technique for liposuction to improve skin tightening. Unfortunately this procedure is operator dependent. The value of a good dosimetry in this type of intervention is crucial. © Nouv Dermatol 2010.