PD21-06 FLUID DYNAMICS AND MORPHOLOGY IN THE OBSTRUCTED URETHRA

Abstract

You have accessJournal of UrologyTrauma/Reconstruction/Diversion: Urethral Reconstruction (including Stricture, Diverticulum) I1 Apr 2018PD21-06 FLUID DYNAMICS AND MORPHOLOGY IN THE OBSTRUCTED URETHRA Sunchin Kim, Cameron Hinkel, Donald Coffey, Yitshak Zohar, Benjamin Lee, and Matthew Gretzer Sunchin KimSunchin Kim More articles by this author , Cameron HinkelCameron Hinkel More articles by this author , Donald CoffeyDonald Coffey More articles by this author , Yitshak ZoharYitshak Zohar More articles by this author , Benjamin LeeBenjamin Lee More articles by this author , and Matthew GretzerMatthew Gretzer More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2018.02.1161AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Current objective methods to evaluate for urethral obstruction include uroflowmetry, cystoscopy, and retrograde urethrogram. We present a novel non-invasive method to identify the presence of urethral obstruction. Through evaluation of the fluid dynamics and morphological changes of a falling water stream, we have identified a characteristic measurement that may be used to indicate the presence of obstruction within the urethra. As fluid exits an opening, there is a breakpoint at which droplets form. Measuring the length to this point of droplet formation was found to relate to the presence of obstruction. METHODS High speed photography with a strobe light set to 3500 flashes per minute was used to capture the point of droplet formation. An 18 French, 20 cm segment of Penrose tubing was used as a model for the urethra, and a 3D printer was used to create models of strictures with diameters of 2 mm and 4 mm. These stricture models were placed midway at the 10 cm mark of the Penrose tubing. A saline bag was allowed to drain under gravity through the tubing, and pictures were obtained with and without the stricture models. RESULTS With the control tubing without any stricture device (Figure A), normal gravity flow resulted in a flow rate of 14.3 ml/sec with the natural breakpoint occurring at 12.5 cm. After the 4 mm stricture device was added to the tubing (Figure C), this resulted in a flow rate of 12.8 ml/sec, with the natural breakpoint occurring consistently at 11 cm. With a 2 mm stricture device added (Figure B), the flow rate was 6.89 ml/sec, with the natural breakpoint occurring at 6.5 cm. CONCLUSIONS While uroflowmetry is the current non-invasive objective method to identify possible urethral obstruction, identification and measure of the morphologic changes to urine flow represents a new way to identify the presence of obstruction. Given the results of our initial study that shows that looking at urine morphology is a consistent and accurate measurement of determining obstruction, the potential to incorporate this technique into consumer photographic applications may facilitate efficient long term follow up of men after urethroplasty. © 2018FiguresReferencesRelatedDetails Volume 199Issue 4SApril 2018Page: e469-e470 Advertisement Copyright & Permissions© 2018MetricsAuthor Information Sunchin Kim More articles by this author Cameron Hinkel More articles by this author Donald Coffey More articles by this author Yitshak Zohar More articles by this author Benjamin Lee More articles by this author Matthew Gretzer More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...