Design Of Wearable ECG And Pulse Signal Acquisition Device For Continuous Blood Pressure Monitoring

Blood pressure,a crucial blood flow index,is of immense significance in reflecting the well-being of human heart and blood vessels.Consequently,accurate and real-time blood pressure measurement contributes greatly to in-time diagnosing,preventing,and treating the diseases related to heart and blood vessels,along with other chronic diseases.Nowadays,most of the continuous blood pressure detectors used in the clinic are cuff type,which will invite discomfort and pain of patients.Besides,the continuous blood pressure measured by such a kind of equipment is inherently discrete,and some vital blood pressure changes may be lost in the measurement process.Given the above problems,this paper follows the product design idea,designs,and realizes a wearable ECG and pulse signal acquisition device for continuous blood pressure monitoring founded on the comprehensive market research,demand analysis,and theoretical research,in the hope of aligning with the clinic use of the continuous blood pressure non-invasive monitoring analyzer developed by the research group for bedside monitoring.The paper’s standpoint is to devise a measurement method without cuff that enables patients to get rid of the discomforting sense of bondage.Additionally,the device is suitable for long-time continuous monitoring of non-invasive blood pressure without intervening patients’ daily activities,when doctors can import the data into a continuous blood pressure non-invasive monitoring analyzer for clinical analysis from the TF card embedded in the device,laying a strong basis for diagnosis.Through exhaustive investigations on the topic,backgrounds,extant international and domestic academic progress,this paper conducts theoretical research,product design,prototype testing,and other preliminary researches of a wearable ECG and pulse signal acquisition device for continuous blood pressure monitoring.The main contributions and achievements are as follows:(1)Based on profoundly analyzing the measurement principle of ECG and PPG signal and the anti-motion interference technology of dynamic physiological signal,the selection of ECG electrode,lead system,and pulse sensor is determined;the surface position of the electrode,the position of pulse wave sensor and acceleration sensor are studied.(2)According to the market research and demand analysis,the system hardware circuit with the core of MSP430F5529,which realizes the functions of LED driving,the ECG and PPG signal conditioning,triaxial acceleration acquisition,TF card storage,etc.,is designed,and the EMC design is carried out.The signal acquisition,electric quantity detection,and TF Card storage based on MSP430F5529 are realized by relying on the embedded development software.Also,the MATLAB software is employed to preprocess the dynamic physiological signals collected by hardware,filter anti-motion interference,identify and highlight the interference segments.(3)Concerning the product’s performance and functional requirements,we carry out the performance tests of the prototype for system voltage,AD performance,storage performance,electric safety,radiated emission,and the functional tests of the prototype for ECG,PPG,acceleration signal acquisition and storage,verifying the prototype’s functionality to some extent.