| Currently, with hypertension and coronary heart disease as the representative, thecardiovascular disease, is increasingly becoming the main threat to human health. Atthe same time, the rapid development of the wireless network communicationtechnology, has led to a new revolution on information. As an opportunity, thetraditional medical model which is mainly used in professional hospital, is changed tothe openly and newly medical mode. In this situation, the research and developmentof the portable,intelligent measuring instruments system,whose carrier of medicalinformation is wireless mobile platform, aiming at the variety of human physiologicalparameters, realizing of health and disease diagnosis, can supply early diagnosis andprevention of cardiovascular diseases with comprehensive, efficient solution.Human body physiological parameters mainly includes ECG, heart rate, bloodpressure, oxygen and temperature etc. As the dynamic organ of human bloodcirculation, heart is beating with the heartbeat cycle, repeatedly completes ventricularsystolic and diastolic process. In the current, ECG examination in clinical anddynamic ECG monitoring (Holter), are using silver chloride (AgCl) wet electrode, itconducts weak ECG through the electrolyte gel in contact with the skin, but itstoxicity substances can penetrate into the skin, resulting in atopic dermatitis, and afteruse in a long time, because of the electrolyte gel dewatering and drying, contactimpedance between the electrode and the skin will change, causes the signalsensitivity and the signal-to-noise ratio decline. In addition, an inflatable cuff bloodpressure measurement based on the Korotkoff sound auscultation, not only constrictsthe user’s daily activities, but also can lead patients to sudden stimuli when thepressure cuff works, which produces mood swings from the psychological changes,resulting in inaccuracy of measurement results.In view of the above problems, the paper with life science, computer science,modern communication technology and instrument science as the basis, studied ahuman physiological parameter monitoring system based on mobile communicationplatform, implementing to heart disease and hypertension and other cardiovasculardisease diagnosis and prevention. The system consists of wearing armor carrier,textile ECG electrodes, finger clip type pulse wave sensor and its measuring circuit,constitutes the basic wearable measurement unit of ECG and blood oxygen saturation,and realizes regression calculation of the ECG and pulse wave signal’s waveformparameter, complishing the systolic and diastolic arterial blood pressure measurementwithout the cuff. Besides, the PDA built a mobile user terminal, which, through the Bluetooth interface, together with measurement unit, constitute the human bodymeasurement network, complete the ECG and pulse wave data receiving, waveformplayback display, as well as the calculation of blood pressure and oxygen saturationand other physiological parameters.This paper studies as following:1. Complete the design of the overall system, including ECG conditioning module,oximetry module, microprocessor unit, the Bluetooth transmission module, and signalfiltering circuit. All of these can ensure effective follow-up signal processing.2. With the construction of mobile terminal, we can realize the real-time receptionof the human ECG and pulse wave data, waveform playback display, as well as thecalculation of the physiological parameters such as blood pressure and oxygensaturation.3. Implementation of the system software design. Completed the user terminalsoftware design, and finished filter processing for ECG signal through the design ofdigital filter.4. Blood pressure and oxygen saturation monitoring. Through the regressioncalculation of the ECG and pulse wave signal’s waveform parameter, achieved theblood pressure measurements without cuff; to fulfill the requirements of monitoringsystem design and the measurement of oxygen saturation condition, we produce thespectral measurement principle, realizing the noninvasive monitoring of blood oxygensaturation.5. Experimental test. Application of monitoring system for experimental analysis.Firstly, The test subjects are calibrated by systolic parameter, through the calibrationexperiment, we proved that the systolic blood pressure can be directly, approximatelycalculated by transit time of pulse wave; secondly, apply standard cuffsphygmomanometer to monitoring system apparatus for carrying out the consistencyanalysis, the experimental results show that, using the monitoring system can replacethe standard cuff sphygmomanometer for blood pressure measurement. |
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