MP68-01 PATTERN ANALYSIS OF LASER FIBER DEGRADATION ACCORDING TO THE LASER SETTING: IN VITRO STUDY OF THE DOUBLE-FIRING PHENOMENON

Abstract

You have accessJournal of UrologyCME1 Apr 2023MP68-01 PATTERN ANALYSIS OF LASER FIBER DEGRADATION ACCORDING TO THE LASER SETTING: IN VITRO STUDY OF THE DOUBLE-FIRING PHENOMENON Sang Won So, Gyoohwan Jung, Hyeji Park, and Sung Yong Cho Sang Won SoSang Won So More articles by this author , Gyoohwan JungGyoohwan Jung More articles by this author , Hyeji ParkHyeji Park More articles by this author , and Sung Yong ChoSung Yong Cho More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000003331.01AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: It is essential to understand the mechanism of the various causes of laser fiber damage and an ideal method of reducing endoscope damage induced by laser emission in multiple sites. This study classified the different patterns of laser fiber degradation according to laser settings and analyzed the role of cavitation bubbles to find a desirable way of minimizing endoscope damage. METHODS: A total of 118 laser fibers were analyzed after 1-,3-, and 5-min laser emission to artificial stones under the settings of 1J-10Hz, 1J-20Hz, 1J-30Hz, and 2J-10Hz. Every 3cm from the fiber tip was marked and examined with a digital microscope and a high-speed camera. The images of the fibers and the movement of cavitation bubbles were taken with a distance of 1 to 5 mm from the gel. RESULTS: Seven types of fiber damage (charring, limited and extensive peeled-off, bumpy, whitish plaque, crack, and break-off) coincided during laser emission. Damages rapidly increased with emission time>3 min regardless of the laser settings. The damaged lengths covered 5 mm on average, and the fibers at 5-min emission were significantly shorter than others. The fiber durability of 1J-10Hz setting was better than other settings after 3-min laser emission. Backward movement of the cavitation bubbles was found at the 1-mm distance from the gel, and the damaged lengths were longer than the diameters of the cavitation bubbles because of their proximal movement. CONCLUSIONS: The damage patterns of the laser fiber tips were classified into seven types. The heat damage around the surface of the laser fiber can be increased according to the high-energy or high-frequency laser setting, a short distance to the stone, a short distance from the tips of flexible ureteroscopes, no cutting laser fiber procedures, and the inappropriate use of irrigation fluid or laser fiber jacket. Source of Funding: This work was supported by a grant No. 2019R1C1C1008339 mainly and another one No. 2017R1A2B3007907 in part of the National Research Foundation (NRF) grant funded by the Korean government (MSIT) © 2023 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 209Issue Supplement 4April 2023Page: e952 Advertisement Copyright & Permissions© 2023 by American Urological Association Education and Research, Inc.MetricsAuthor Information Sang Won So More articles by this author Gyoohwan Jung More articles by this author Hyeji Park More articles by this author Sung Yong Cho More articles by this author Expand All Advertisement PDF downloadLoading ...