Infusion medicine liquid detection system

Abstract

The invention discloses an infusion medicine liquid detection system which comprises a medicine liquid detection sensor and a medicine liquid detection circuit, wherein the medicine liquid detection sensor is a bridge-type capacitor sensor; the medicine liquid detection sensor monitors the change of medicine liquid inside an infusion tube in real time; and when the medicine liquid inside the infusion tube changes, the capacitor capacity of the medicine detection sensor also changes. The medicine liquid detection circuit provides an excitation signal required by the medicine liquid detection sensor, and amplifies and converts the detection signal of the medicine liquid detection sensor to form a direct current voltage signal used as an output signal of the medicine liquid detection circuit;a change curve of the output signal of the medicine liquid detection circuit at the set time interval reflects the process of the medicine liquid in the infusion tube from existence to nonexistence;and whether the medicine liquid exists in the infusion tube or not is judged by monitoring the output signal of the medicine liquid detection circuit. The system has the advantages that through the detection on the process of the infusion medicine liquid from existence to nonexistence, the environment adaptability is high; the anti-interference capability is high; and the medicine liquid detectionsensor and the medicine liquid detection circuit are arranged in a separated way, and can be conveniently matched with an existing infusion system.

Description

technical field [0001] The invention relates to a detection system, in particular to an infusion liquid detection system, which belongs to the field of auxiliary medical equipment. Background technique [0002] The capacitance used in the infusion medicine liquid detection system based on capacitance capacity detection has a small capacity, generally in the pF level. With such a small capacitance capacity, when there is a change in the liquid medicine in the infusion tube, the change in capacitance is even smaller. , which makes the detection more difficult. [0003] To solve the above problems, there are currently two detection methods: [0004] (1) Construct an oscillating circuit. The oscillating frequency of the oscillating circuit is related to the capacitance. Whether the liquid medicine changes will cause the capacitance to change, and the change of the capacitance will cause the oscillation frequency to change. Therefore, it can be determined by detecting the vibrat...

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Problems solved by technology

[0006] The above two methods are based on the detection of the presence and absence of the liquid medicine in the infusion tube. Since the environment has an impact on the capacitance, and the capacitance of the measured capacitance itself is small, these state-based detection methods are vulnerable. Interference, and poor manufacturability when commercialized

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