A Wireless Hemodialysis Blood Oozing Detection and Alarm System

摘要

During the hemodialysis treatment, two needles, for drawing to dialyzer and for returning filtered blood to the body, respectively, will be inserted into an AV shunt. Occasionally, the blood leaking is occurred on the interface of needle and artificial fistula. This incident not only increased the risk of infection, it also caused many conflicts between patients and nurses. This paper presents a wireless alarm system that can detect the blood leaking and send the alarm signal to nurse station. The system is consisting' of two optical blood detectors, an adjustable threshold comparator, a Wi-Fi embedded MCU, and an user-friendly management APP. The system continuously send green light on the gauze. When certain amount of blood pass though the gauze, the decreasing of reflection light would activate alarm event. A MS-Windows APP is installed on the nurse station. It monitors the front-end sensing devices and, upon receiving alarm signal, it pop-up a warning dialog to remind medical staffs to take care of the event. The primary test shows the system can effectively provide early blood leaking detection and reduce the rate of aforementioned problems.