Design and construction of infusion device analyzer

摘要

The purpose of the research aims to design and construction of infusion device analyzer. This research has adopted the principle of the standard calibration curve relationship between the digital output of the load cell to the volume of the solution at any time, and the pressure acting on the pressure sensor to the digital output of it. The designed and constructed infusion device analyzer was composed of four main parts:1) the control part consisting of micro switches for selecting the operating mode, 2) signal detection part composing of load cells, pressure sensor for measuring the volumetric and flow rate of fluid delivered from infusion devices and occlusion pressure in TV line respectively, 3) the processing part comprising of microcontroller ARM Cortex M3 with C language program and 4) the display part includes touch screen graphic - LCD color and computer interfacing via a USB port to analyze the operation of the infusion devices in the form of Trumpet Curve. The results of functional testing were compared with standard infusion devices analyzer Metron Lagu showed that the average percentage error of flow rate and occlusion pressure were 0.134 percent and 0.132 percent successively. The results of standard calibration of the flow rates by the laboratory of Calibration Services and Environmental Analysis Department, Technology Promotion Association (Thailand - Japan) that has been certified by the international ISO - 17025 shown that the average uncertainty of the 95 percent confidence level and average percentage error were ±1.5 ml/hr and 1.9 percent respectively. The production cost of the prototype is 15,000 baht.