Design And Realization Of A Biochemical Analyzer

Since the introduction of the traditional manual biochemical analysis may lead to sophisticated operation, the great effect from the operators' subjective factors, and the serious error, the appearance of the biochemical analyzer changes this situation significantly. Because the overall level of domestic medical equipments are not so satisfactory, biochemical laboratories mainly use imports. Therefore, the study on automatic biochemical analyzer has a great significance of enhancing our level in researching and designing biochemical analyzer. This project is conceived to design a small semi-automatic biochemical analyzer, which is easy to be used with improved functions . The biochemical analyzer is mainly used for exosomatic diagnosis to analyses the various biochemical guide line of blood and other body fluids, it mensurates concentration of objects by photovoltaic method. Main research content is as follows:Studying through the principles of biochemical analysis and the basis of biochemical test, and according to the performance indicators of the biochemical analyzer to be achieved, the architectures of control system of the biochemical analyzer is designed, and a clear and reasonable distribution for the hardware and software functions is made.The hardware system of biochemical analyzer with the MSP430F149 as the core is realized. Signal detection was achieved by using photovoltaic method, and an automatic gain signal conditional circuit was designed to increase low-concentrations reagents signal-to-noise ratio, and improved the detection accuracy of the biochemical analyzer.The design of the software of the biochemical analyzer has been finished based on IAR Embedded Workbench for debugging development. According to the system functional demand, the serial communication module, display module, keyboard module, A/D conversion module and data processing module are designed.In the course of testing, specimen should stay at the constant temperature conditions, temperature control has a greater impact on the performances of the biochemical analyzer, the design control algorithms adopts fuzzy theory, use digital temperature sensors, and use MSP430F149 as MCU to form a closed loop temperature control system. By this means, the system achieved a good dynamic performance and well stability.The design of biochemical analyzer has been adopted online system debugging, it can run stably, and the result is correct, so the system design is reasonable and reliable. The design conforms to the trends of medical equipment domestically, and with the completion of the development of the analyzer and being market, it is bound to have good social and economic benefits.