CUED Publications database

The shape of the urine stream--from biophysics to diagnostics.

Wheeler, APS and Morad, S and Buchholz, N and Knight, MM (2012) The shape of the urine stream--from biophysics to diagnostics. PLoS One, 7. e47133-.

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Abstract

We develop a new computational model of capillary-waves in free-jet flows, and apply this to the problem of urological diagnosis in this first ever study of the biophysics behind the characteristic shape of the urine stream as it exits the urethral meatus. The computational fluid dynamics model is used to determine the shape of a liquid jet issuing from a non-axisymmetric orifice as it deforms under the action of surface tension. The computational results are verified with experimental modelling of the urine stream. We find that the shape of the stream can be used as an indicator of both the flow rate and orifice geometry. We performed volunteer trials which showed these fundamental correlations are also observed in vivo for male healthy volunteers and patients undergoing treatment for low flow rate. For healthy volunteers, self estimation of the flow shape provided an accurate estimation of peak flow rate (± 2%). However for the patients, the relationship between shape and flow rate suggested poor meatal opening during voiding. The results show that self measurement of the shape of the urine stream can be a useful diagnostic tool for medical practitioners since it provides a non-invasive method of measuring urine flow rate and urethral dilation.

Item Type: Article
Uncontrolled Keywords: Adolescent Adult Aged Aged, 80 and over Algorithms Biophysical Phenomena Computer Simulation Humans Male Middle Aged Models, Theoretical Urodynamics Young Adult
Subjects: UNSPECIFIED
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 06 Sep 2017 20:06
Last Modified: 23 Nov 2017 03:40
DOI: