Hardware Circuit Design Of Multiple Physiological Parameters Acquisition System

Physiological parameters provide reference for clinical diagnosis and healthycare. Collection and process of physiological parameters is also one of the hot topicsin the field of medical electronics. In order to facilitate research and comprehensiveanalysis of people’s physiological and pathological conditions of the human body, thecollected physiological parameter type need varieties, the collection of multiplephysiological parameters have became necessary for modern medical electronicsresearch.According the above requirements, this paper proposes a solution ofphysiological data collection.The system adopted modular design, used the highperformance processor STM32which based on Cortex-M3core as the hardwareplatform and adopted24high-precision analog-digital conversion chip ADS129xchips ADS1294R and ADS1294which produced by TI, with the correspondingphysiological parameter acquisition module, complete the collection of physiologicalparameters,such as ECG, respiration, blood pressure, noninvasive blood oxygen,temperature and so on.The research of this paper is summarized as follows:(1) On the basis of analyzing the need of multiple physiological parametersacquisition system and the characteristics of the collected signal such as ECG,respiration signal, noninvasive blood pressure, oxygen saturation, select the STM32as the main chip of multiple physiological parameters acquisition system andADS1294as A/D converter chip, completed the overall system design of multiplephysiological parameters acquisition system based on STM32and ADS1294.(2) Each module of multiple physiological parameters system was analyzed,including ECG signal acquisition module, respiration signal module, noninvasiveblood pressure module, oxygen saturation module and peripheral circuit of ARM, andthe hardware circuit design of each module was completed in Altium Designer Winter09Integrated Development Environment, in order to verify each circuit, completedsimulation analysis by Mutisim12.(3) Based on the theory analysis of electromagnetic compatibility, in order to enhance the anti-jamming capability of multiple physiological parameters collectionsystem and to minimize the impact of various electromagnetic interference,completed the board-level electromagnetic compatibility design of multiplephysiological parameters acquisition system, including8shelves stack and layoutdesign of the circuit so to design the circuit which can achieve the intended purpose,namely achieve electromagnetic compatibility.(4) Completed the design of system testing plan, through using humanphysiological parameters simulator that simulate human’s physiological parameters totest each module of multiple physiological parameters acquisition system, including sECG signal acquisition module, respiration signal module, noninvasive bloodpressure signal modules, oxygen saturation module. Verify the function of multiplephysiological parameters acquisition system designed in this paper by analyzing thetest results of each module and testify that the system achieved multi-channelacquisition of physiological parameters.