Development and evaluation of a light-emitting diode endoscopic light source

Neil T. Clancy*, Rui Li, Kevin Rogers, Paul Driscoll, Peter Excel, Ron Yandle, George Hanna, Nigel Copner, Daniel S. Elson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)

24 Citations (SciVal)


Light-emitting diode (LED) based endoscopic illumination devices have been shown to have several benefits over arclamp systems. LEDs are energy-efficient, small, durable, and inexpensive, however their use in endoscopy has been limited by the difficulty in efficiently coupling enough light into the endoscopic light cable. We have demonstrated a highly homogenised lightpipe LED light source that combines the light from four Luminus LEDs emitting in the red, green, blue and violet using innovative dichroics that maximise light throughput. The light source spectrally combines light from highly divergent incoherent sources that have a Lambertian intensity profile to provide illumination matched to the acceptance numerical aperture of a liquid light guide or fibre bundle. The LED light source was coupled to a standard laparoscope and performance parameters (power, luminance, colour temperature) compared to a xenon lamp. Although the total illuminance from the endoscope was lower, adjustment of the LEDs' relative intensities enabled contrast enhancement in biological tissue imaging. The LED light engine was also evaluated in a minimally invasive surgery (MIS) box trainer and in vivo during a porcine MIS procedure where it was used to generate 'narrowband' images. Future work using the violet LED could enable photodynamic diagnosis of bladder cancer.

Original languageEnglish
Title of host publicationAdvanced Biomedical and Clinical Diagnostic Systems X
Publication statusPublished - 2012
Externally publishedYes
EventAdvanced Biomedical and Clinical Diagnostic Systems X - San Francisco, CA, United States of America
Duration: 22 Jan 201224 Jan 2012

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceAdvanced Biomedical and Clinical Diagnostic Systems X
Country/TerritoryUnited States of America
CitySan Francisco, CA
Period22 Jan 201224 Jan 2012


  • Laparoscopy
  • Light-emitting diode (LED)
  • Minimally-invasive surgery


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