Construction of an array of LEDs coupled to a concentrator for phototherapy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The use of LED devices for phototherapy has been expanding in the last decade. This technology provides a safer emission spectrum in large target tissue areas when compared to laser emissions. For enhancing the phototherapeutic effects of red light emitted by LEDs, a simple optical concentrator capable of efficient light concentration and homogenization was developed. The LEDs wavelength of 660 nm is coincident with an absorption peak of the mitochondrial photoreceptor molecule cytochrome c oxidase. The prototype was optimized by non-sequential ray-tracing software ZEMAX, attaining both excellent light uniformity and 50mW/cm2 irradiance at the concentrator output end. Heat emanated from the LEDs source is effectively dissipated by the side walls of the concentrator, ensuring a nearly constant temperature environment for tissue treatment. The prototype was tested on cutaneous hyperpigmented marks caused by cupping in two healthy volunteers. Marks were irradiated by LEDs radiations with or without the use of concentrator respectively. Equal exposure durations and light fluences were tested. The use of the concentrator-coupled LEDs source revealed an activation of blood movement immediately after LEDs exposure, an effect not attainable by the LEDs source without the concentrator even at extended exposure time. Promising futures for the treatment of inflammation, tissue repair and skin rejuvenation could be expected by adopting this simple technique.

Original languageEnglish
Title of host publicationMEDICAL LASER APPLICATIONS AND LASER-TISSUE INTERACTIONS V
EditorsR. Sroka, L. D. Lilge
PublisherSPIE-International Society for Optical Engineering
ISBN (Print)9780819486837
DOIs
Publication statusPublished - 2011
EventEuropean Conference on Biomedical Optics, ECBO 2011 - Munich, Germany
Duration: 22 May 201126 May 2011

Publication series

Name Proceedings of SPIE
PublisherSPIE - International Society for Optical Engineering
Volume8092
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceEuropean Conference on Biomedical Optics, ECBO 2011
Country/TerritoryGermany
CityMunich
Period22/05/1126/05/11

Keywords

  • Concentrator
  • Cupping
  • LED-array
  • Photostimulation
  • Phototherapy
  • Uniformity

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