EasyVoid ^TM：創新可攜帶式尿流速檢測儀 — 從臨床痛點到實際落地

陳妤甄, 陳浩瑋, Ray Chang

高雄醫學大學附設醫院泌尿科、美國史丹佛大學

EasyVoid ^TM : A Novel Portable Uroflowmeter for Home-Based, Container-Free Urinary Flow Measurement on Any Toilet

Yu-Chen Chen, Hao-Wei Chen, Ray Chang

Department of Urology, Kaohsiung Medical University Hospital; Stanford University

Purpose: Conventional uroflowmetry relies on in-clinic testing and urine collection, often altering voiding behavior and limiting access. Sound-based systems offer partial solutions but are hampered by inconsistent calibration, variable acoustic environments, and lack of standardization. We present EasyVoid, a truly portable and container-free uroflowmeter that leverages the Coandă effect to achieve accurate, real-time uroflowmetry on any toilet, without pressure sensors, microphones, or specialized collection setups (Fig. A).

Materials and Methods: The EasyVoid device utilizes a passive helical rotor that captures urine stream momentum through the Coandă effect (Fig. A). Rotor spin is detected by a Hall effect sensor and transmitted wirelessly to a smartphone. Angular velocity is converted to flow rate using a polynomial calibration model through signal processing steps including filtering, Hilbert transform, and phase unwrapping (Fig. B). The system was validated using simulated voiding events across five clinical flow patterns (bell-shaped, bell-with-tail, plateau, interrupted, and small-volume), compared against a standard uroflowmeter (MMS Flowmaster). Key urodynamic parameters—including Qmax, voided volume, voiding time, and Qave—were extracted and analyzed.

Results: Across 45 simulated voids, EasyVoid demonstrated strong agreement with standard uroflowmetry in reconstructing key voiding parameters: Qmax (R² = 0.81), Qave (R² = 0.89), voided volume (R² = 0.73), and voiding time (R² = 0.99) (Fig. C). In a single-blind diagnostic classification task, six board-certified urologists independently reviewed 90 randomized voiding curves. Interpretations from EasyVoid and standard uroflowmetry achieved 91% overall agreement (κ = 0.84), indicating expert-level consistency (Fig. D). These findings support EasyVoid’s diagnostic reliability and its capability to reproduce urologist interpretations comparable to standard uroflowmetry.