Dr. Gwen Iarmarcovai Profile

Dr. Gwen Iarmarcovai

at Ekkyo

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Proceedings Article | 12 February 2009 Paper

Scar prevention by laser-assisted scar healing (LASH) using thermal post-conditioning

Alban Gossé, Gwen Iarmarcovai, Alexandre Capon, Alain Cornil, Serge Mordon

Proceedings Volume 7175, 71750K (2009) https://doi.org/10.1117/12.807807

KEYWORDS: Skin, Laser therapeutics, Wound healing, Surgery, Abdomen, Proteins, Temperature metrology, Tissues, Safety, Clinical trials

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An 810-nm diode laser system was developed to accelerate and improve the healing process in surgical scars. Using thermal post-conditioning, the laser system provides a localised moderate heating whose maximum temperature is controlled to prevent tissue damage and stimulate the heat shock proteins (HSP) synthesis. The 810-nm wavelength allows a deep penetration of the light into the dermis, without damaging the epidermis. The time along which surgical incision is treated (continuous wave) must therefore be selected carefully with respect to the temperature precision achieved within the heated volume. A top-hat profile is preferred to a Gaussian profile in order to ensure the skin surface temperature is homogenised, as is the temperature of the heated volume. The spot shape will depend on the medical indication. The treatment should be made safe and controlled by means of a safety strip containing an RFID chip which will transmit the various operating settings to the laser device. A clinical trial aims at evaluating the 810 nm-diode laser in surgical incisions, with only one laser treatment immediately after skin closure, of patients with Fitzpatrick skin types I to IV. Surgical incisions were divided into two fields, with only portions randomly selected receiving laser treatment. At the final scar analysis (12 months) of the pilot study, the treated portion scored significantly better for both surgeon (P = 0.046) and patients (P = 0.025). Further studies may be warranted to better understand the cellular mechanisms leading to Laser-Assisted Skin Healing (LASH).

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