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Updated: May 19, 2026

Optimizing Mouse Urodynamic Techniques for Improved Accuracy
Published on: June 7, 2024
EasyVoid: A Handheld Coandă Effect Uroflowmeter for Accurate and Portable Measurement of Urinary Flow Dynamics
Ray Chang1, Yu-Chen Chen2,3, Hao-Wei Chen2
1Department of Mechanical EngineeringStanford University Stanford CA 94305 USA.
Objective:
Diagnosis of lower urinary tract symptoms (LUTS) often relies on subjective questionnaires, conventional uroflowmetry or invasive urodynamic study, each with inherent limitations.
Methods And Procedures:
This work presents EasyVoid, a novel handheld device that employs the Coandă effect to enable non-invasive and quantitative measurement of urinary flow. EasyVoid uses a passive fluidic mechanism in which the urinary stream adheres to a curved surface and transfers angular momentum to a helical rotor, allowing direct estimation of flow rate and volume without pressure sensors or weighing systems.
Results:
EasyVoid simultaneously records key voiding parameters, including flow rate, flow pattern, voiding time, and voided volume, with high temporal precision. In controlled bench-top trials using simulated urine events, measurements obtained from EasyVoid showed strong agreement with standard uroflowmetry across multiple flow patterns.
Conclusion:
These results demonstrate the potential of EasyVoid for portable and quantitative assessment of urinary flow dynamics, offering a promising solution for remote urinary health monitoring.
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