A Non-invasive Photoemitter for Healing Skin Wounds

Photobiomodulation is the emission of low intensity light to locally induce cells to equilibrium. One of its possible applications is for skin wound healing. However, any such solution must be non-contact because on the contrary it can cause pain and make the treatment unfeasible. Here we propose a device capable of emitting red light through LEDs to treat this type of injury in a non-contact way. In addition to assessing the optimal irradiation distance and estimating a maximum area of homogeneous coverage, we compared seven different configurations to assess the temperature stability during the treatment application. We tried two values of power density for the emission (50 \({\text {mW/cm}}^ {2}\) and 60 \({\text {mW/cm}}^ {2}\)) and two distance measurements (5 and 7 \({\text {cm}}\)) between LED boards and a temperature sensor, over a 10-min period. As a result of the optimal distance experiment, the 5 cm distance was used in the following two experiments, where at this distance it is possible to carry out applications covering a homogeneous area of up to 323.95 \({\text {cm}}^{2}\). In the temperature fluctuation experiment, we found that, although some configurations have less stability than the others, none of them compromises the efficiency of the treatment.