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TitlePDMS microlenses for focusing light in narrow band imaging diagnostics
Author(s)Costa, Adriana Clotilde
Pimenta, Sara
Ribeiro, J. F.
Silva, Manuel Fernando Ribeiro
Wolffenbuttel, Reinoud F.
Dong, Tao
Yang, Zhaochu
Correia, José H.
KeywordsNarrow Band Imaging (NBI)
Polydimethylsiloxane (PDMS) mu-lens
minimally invasive medical devices
Polydimethylsiloxane (PDMS) µ-lens
Issue date1-Mar-2019
PublisherMultidisciplinary Digital Publishing Institute
Abstract(s)Minimally invasive medical devices can greatly benefit from Narrow Band Imaging (NBI) diagnostic capabilities, as different wavelengths allow penetration of distinct layers of the gastrointestinal tract mucosa, improving diagnostic accuracy and targeting different pathologies. An important performance parameter is the light intensity at a given power consumption of the medical device. A method to increase the illumination intensity in the NBI diagnostic technique was developed and applied to minimally invasive medical devices (e.g., endoscopic capsules), without increasing the size and power consumption of such instruments. Endoscopic capsules are generally equipped with light-emitting diodes (LEDs) operating in the RGB (red, green, and blue) visible light spectrum. A polydimethylsiloxane (PDMS) µ-lens was designed for a maximum light intensity at the target area of interest when placed on top of the LEDs. The PDMS µ-lens was fabricated using a low-cost hanging droplet method. Experiments reveal an increased illumination intensity by a factor of 1.21 for both the blue and green LEDs and 1.18 for the red LED. These promising results can increase the resolution of NBI in endoscopic capsules, which can contribute to early gastric lesions diagnosis.
AccessOpen access
Appears in Collections:DEI - Artigos em revistas internacionais

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