Medical infusion liquid drop speed monitoring method and device

Abstract

The invention provides a medical infusion liquid drop speed monitoring method and a medical infusion liquid drop speed monitoring device, which relate to the field of medical infusion monitoring application. The device comprises an infrared double-pair hose detection circuit, a differential detection circuit, a control unit circuit and an alarming circuit, wherein the infrared double-pair hose detection circuit comprises a first infrared transmitter, a first infrared receiver, a first impedance isolator, a second infrared transmitter, a second infrared receiver and a second impedance insulator; the differential detection circuit comprises a signal differentiator, a signal rectifier, a signal amplifier and a voltage stabilizing and signal shaper; and the control unit circuit is used for processing the failing edge of an output pulse signal of the differential detection circuit and acquiring the time interval between two adjacent infusion liquid drops to judge if an alarming signal is needed to be generated. In the invention, the anti-interference performance of both the medical infusion liquid drop speed monitoring method and the medical infusion liquid drop speed monitoring device is improved.

Description

technical field [0001] The invention relates to a method and a device for monitoring the droplet velocity of medical transfusion, belonging to the application field of medical transfusion monitoring. Background technique [0002] At present, the monitoring device used for medical infusion generally adopts an infrared pair tube, that is, an infrared light-emitting diode and an infrared receiving photosensitive transistor are respectively symmetrically installed on both sides of the wall of the Murphy dropper. Drops are detected. The working principle of this liquid drop detection is: use infrared detection technology to detect the infusion speed at the wall of Mufei's dropper, specifically, the infrared light-emitting diode emits infrared light, and the light passes through the Mufei's dropper to irradiate the infrared receiving photosensitive transistor , the infrared receiving phototransistor converts the received light signal into a photocurrent output. When there is no ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of this medical infusion monitoring device based on infrared pair tubes are: ① When the Murphy’s dropper passes through the interfering light, the output voltage of the infrared receiving phototransistor is not 0V when no liquid drops, and the output pulse voltage The amplitude is proportional to the intensity of the interfering light; ②When there is water mist on the inner wall of the Murphy dropper, it will block part of the infrared light, and the output voltage of the infrared receiving phototransistor will not be 0V even if there is no droplet dripping

The above situations are very likely to cause severe distortion of the double pulse signal sent by the infrared receiving phototransistor, and the number of pulse signals detected per unit time is inaccurate, which will eventually lead to inaccurate detection of the droplet velocity of the infusion monitoring device, and the alarm should not be reported. Misreporting from time to time or not reporting when it should be reported, leading to serious medical accidents

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