Diaper Sensor for Monitoring Urinary Incontinence.

概要

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A telemetry system for monitoring urinary incontinence was developed. Temperature changes in diaper were monitoed. System consisted of thermistor bridges, comparator, transmitter and receiver. Difference between temperature in the center of diaper after urinary incontinence and abdominal skin temperature was compared. When temperature difference reached a threshold level, then the transmitting signal was operated. The signal was detected with receiver and alarm LED was flashed. The threshold level was determined by in-vivo study. Continuous monitoring of temperature difference inside a diaper was 0.6°C, so that the threshold value for comparing signal was determined as 0.5°C. In clinical evaluation, bed fasten patients and patients who used with wheelchair were monitored. 13 out of 17 urinary incontinences were observed correctly. The error of developed system was caused 1) inadequate sensing positions, 2) incorrect threshold level. In 3 out of 4, when urinary volume was less than 20ml, the sensor could not detect the ascending temperature caused by urinary incontinence. We assumed skin temperature inside a diaper was uniform, but 0.2°C to 0.5°C temperature differences were observed, so that the comparator operated improperly.
一般社団法人日本生体医工学会の論文