An Impedance Measurement of Intravesical Urine Volume Appropriate to Seated Posture

In this work, in order to prevent urinary incontinence caused by various functional diseases, we aim to estimate the urination condition from the body water amount in the vicinity of the bladder. Unlike a conventional monitoring system using ultrasonic device, assuming available on a wheelchair, our sensor has a good robustness to probing condition when seated, body posture and movement by applying the AC impedance method to the bladder. We implement an impedance-based prototype system and experiment to estimate intravesical urine volume. As a result, we are confirmed that the impedance value decreased according to time after drinking water. In addition, we compare the measurement results with the commercial ultrasonic monitoring system and verify the robustness of our proposed system to probing condition when seated.