Development Of The Autoanalyzer For Determination Of The Erythrocyte Sedimentation Rate

In recent years, many kinds of medical instruments can work automatically in stead of be operated by humans with the development of the electronic technology, the control technology and the sensor technology. The auto-analyzer for determination of the erythrocyte sedimentation rate is a typical example. It can effectively solve the problems caused by manual operation, so it has a promising application future.In this paper, the theory of ESR test is analyzed firstly, and then the control circuit of ESR test is designed to meet the requirements. The microprocessor is applied as the central controller, and the signal-captured circuit, the drive circuit of step-motor, the multiplexer switch circuit, the circuit of voltage comparator, the keyboard circuit, the LCD circuit, the SCI circuit are designed as the peripheral circuit. The programme of system control, including initialized programme, the sub-programme of the data acquisition, the sub-programme to display the operation statuses and results in LCD, the sub-programme to capture the values of the keyboard, the sub-programme to drive the step-motor , the programme to print the results and so on , which are programmed in C language. The system is tested and the whole programme is debugged in the developing environment .Finally, four blood samples are tested repetitively. Compared with the real values, there is an acceptable error between the real values and the test values. From the test, the feasibility and the advantages of quick test and accurate measurement which can help doctors get the results quickly and directly and give the patients a quick and accurate diagnosis are proved.