title: Circumferential irradiation for interstitial coagulation of urethral stricture.
abstract: An optical diffuser was developed to achieve radially uniform light irradiation by micro-machining helical patterns on the fiber surface for endoscopically treating urethral stricture. Spatial emission from the diffuser was evaluated by goniometric measurements. A computational model was developed to predict spatio-temporal heat distribution during the interstitial coagulation. The fabricated diffuser yielded circumferential light distribution with slightly concentrated energy at the proximal end. Both simulation and tissue testing demonstrated approximately 1-mm coagulation thickness at 6 W for 10 sec with 1470 nm. The proposed optical diffuser may be a feasible tool to treat the urethral stricture in a uniform manner.
authors.forename: Trung Hau
authors.initials: TH
authors.lastname: Nguyen
authors.forename: Yun-Hee
authors.initials: YH
authors.lastname: Rhee
authors.forename: Jin-Chul
authors.initials: JC
authors.lastname: Ahn
authors.forename: Hyun Wook
authors.initials: HW
authors.lastname: Kang