Micro liquid flow measuring device based on conductivity measurement and measuring method

Abstract

The invention discloses a micro liquid flow measuring device based on conductivity measurement and a measuring method. The micro liquid flow measuring device comprises a device body of a barrel-shapedstructure, and the device body comprises an inner barrel composed of graphite electrodes and an outer barrel arranged outside the inner barrel; the inner barrel comprises an arc-shaped positive electrode and an arc-shaped negative electrode; an insulating block is arranged between the positive electrode and the negative electrode; a liquid outlet is formed in the lower portion of the device body,and an electromagnetic valve is arranged at the corresponding position of the liquid outlet. A liquid inlet is formed below the device body; a first infrared transmitting tube for measuring liquid height is arranged at the lower part of the device body, and a second infrared transmitting tube for measuring liquid height is arranged at the upper part of the device body; the problems that an existing infusion pump / injection pump detector on the market is long in micro flow measurement time, unstable, high in manufacturing cost and the like are solved.

Description

technical field [0001] The invention relates to micro-flow detection technology, in particular to a conductometric measurement-based micro-liquid flow measurement device and measurement method. Background technique [0002] Clinically, the micro-flow infusion technology is mainly used in medical infusion pumps, syringe pumps and other therapeutic equipment, and is widely used in medical behaviors such as patient nutritional supplements, blood transfusions, anticancer agents, anticoagulants, and anesthetics. Micro-flow infusion technology can accurately control the number and flow of infusion fluid, ensure that the drug can enter the patient's body at a uniform speed, accurately and safely, and realize high-precision, stable and pulsation-free liquid mode, improving the efficiency and flexibility of clinical drug delivery operations. Reduce nursing workload. Medical infusion pumps and syringe pumps are widely used in clinical treatment. The risk of equipment mainly comes fro...

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Problems solved by technology

[0003] Existing infusion pump / syringe pump detectors have problems such as long time measurement, instability, and high manufacturing cost in measuring small flow rates

It takes too long to measure the micro-flow rate of existing products, which is not conducive to the flow quality control of daily infusion pumps and syringe pumps in hospitals; the use of infrared paired tubes and micro-sampling technology to measure micro-flow rates is prone to mismeasurement caused by water hanging on the tube wall, thus affecting measurement accuracy

The accuracy of micro-flow measurement using infrared paired tubes and micro-sampling technology is generally low. Similar testing instruments on the market are generally greater than or equal to 1%. Using this design, the measurement accuracy can reach 0.5%.

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