Automatic Detection System Of The Intravenous Infusion Level

Medical infusion is an important treatment in clinic. During the infusion, medical personnel have to deal with the business in time when the infusion fluid is dripping up and when the infusion speed is much slower or faster. Because of the absence of the automatically measuring settings, special medical person has to ward them. This aggravates the patient's mental burden and the nursing persons' working burden. This also handicaps the synthesis management of the ward. Thus, the system is developed to measure infusion liquid level and infusion speed. The system automatically transports the detecting signal to the nursing office. In it the infusing situation of every bed in every sickroom is displayed. When the infusion liquid level is under the given lower limit and the infusion speed is much faster or lower, the alarm will be made in nursing office and corresponding bed to remind the paramedic to deal with it.To measure the medical infusion liquid level automatically and accurately without contact, a variable- dielectric-constant capacitive sensor is designed. The experimental data is obtained with the use of electrodes of different width. By analyzing the correlation between them, it is found that the sensitivity affected by the speed of infusion. The model of the sensor is presented and then the affecting factors and the mechanism on the sensitivity are discussed. It is showed that the water absorbed on the inside wall by molecular force is easily polarized, making the dielectric constant abnormally increase, which make water absorbed have significant effect on the sensitivity. Theoretical foundation for the designation of sensor and modification of the measured data is providedThis measuring setting consists of capacitance sensor, local measuring and alarming block, central sampling block etc. The local measuring and alarming block can be used singly.Through theoretically designing and fabricating the capacitance sensor, circuit designing and debugging, it found that the measuring setting can satisfy practical demands. Based on this a suit of infusion-liquid-level-measuring system is developed.