Energia emitida por laser de baixa potência através do policloreto de vinil

Abstract

Low intensity laser therapy is widely used in clinical practice on open cutaneos wounds. Managing these wounds inadequatelly may result in complications, in more severe cases it can result in amputations, septcaemia and death. Polyvinyl Chloride (plastic film) is generally used to provide better asepsis and avoid mechanical contact between the laser pen and the ulcers. This study objective was to verify the Polyvinyl Chloride interferrence in diferent laser pens luminous emission. Data was colected in the Laboratório de Magnetismo e Materiais Magnéticos (LMMM) in the Universidade Federal de Santa Maria (UFSM), using a DET36A photodetector, manufactured by Thorlabs. An Ibramed Laserpulse with Heliun-neon (He-Ne 660 ηm) and Galium Arsenide (Ga-As 830 ηm) laser pens in 3 diferent situations: Control (without Polyvinyl Chloride), Polyvinyl Chloride in contact with the skin and pen and Polyvinyl Chloride with 1cm distance between the skin and pen. In each situation, 30 emissions were realized using 1, 4 and 8 J/cm². Results demonstrate that diferent intensity (1, 4 and 8 J/cm²) do not modify luminous emission. He-Ne Laser showed in relation to control, a 19% reduction in the direct contat group and a 17% reduction in the 1cm group. In Ga-As Laser the reductions were 8% and 21%, respectively. It follows that Polyvinyl Chloride reduces the luminous emission by about 15% in different laser pens. This reduction must be considered when electing dosimetry for this kind of use of laser devices.