1. National Institute of Measurement and Testing Technology, Chengdu, Sichuan 610021, China
2. Leshan Metrological Measurement Institute, Leshan, Sichuan 614000, China
3. Sichuan Zhongce Radiation Technology Co. Ltd, Chengdu, Sichuan 610021, China
Abstract：Using the principle of measuring the micro-flow rate of a fixed-volume piston cavity, based on the relationship between the piston displacement and the flow rate, the measurement model, theoretical calculation method, hardware design and corresponding software system of medical micro-flow are introduced. The micro-flow measurement technology can complete the calibration of medical infusion pump and injection pump in a short time. The experimental results show that the flow detector can measure the micro-flow rate from 1mL/h to 1500mL/h, and can not only respond to the micro-flow rate of 1mL/h quickly, but also the maximum allowable error of instantaneous flow rate is less than ±1%. The maximum allowable error of cumulative flow rate is less than ±1% when the volume of liquid in the injection chamber is larger than 5mL.
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2020, Vol. 41 
