Refraction of the emitted luminosity by laser low power through different angles and marks of plastic film of polyvinylchloride

Abstract

Introduction: Laser is used in the treatment of skin ulcers, but for greater asepsis and to avoid contamination of other patients through the pen, polyvinyl chloride (plastic film - PVC) is used. Objectives: To analyze the interference of different polyvinyl chloride brands and pen tilt angles on the Helium-Neon (He-Ne) and Arsenide-Gallium (Ar-Ga) lasers emitted light. Methods: The samples were collected by photosensor (DET36A). Using intensity of 1 J/cm² in the follow situations: plastic film in direct contact with the equipment pen, and 1 cm from the pen, and then with slopes of 15º, 30º and 45º. Results: The different brands of plastic film showed an average reduction of 12.5% (between 4% and 26%) for direct contact and 14% for the plastic film positioned 1 cm from the pens of He-Ne and Ar-Ga. The pen inclination of He-Ne reduced luminosity, and at 0º 12.5% (± 3), at 15º 13% (± 3), at 30º 16% (± 3) and at 45º this decrease was 17 % (± 3). In the Ar-Ga pen, this reduction was respectively at 0º of 14.7% (± 2), at 15º of 15.5% (± 2), at 30º of 18% (± 2) and at 45º of 20% (± 3) in relation to the control (no plastic film). In LASER Ar-Ga this reduction was approximately 2% (± 1) smaller than in He-Ne at different slopes. Conclusion: The different plastic films reduce the brightness level by approximately 13% in the different Laser pens.