一种连续无创血压监测头带的研究

Design of non-invasive continuous blood pressure monitoring headband

目前大多数无创血压测量采用的是袖带示波测量法,仪器携带不方便;通过气泵对袖带进行充放气,测量周期长,不能够对人体血压进行连续地测量,考虑研制穿戴式血压测量头带,对人体血压进行无创连续测量。采用高分辨率心电采集芯片ADS1292R采集头部微弱心电信号(electrocardiogram,ECG),同时使用反射式光电传感器在眉骨处采集时间上严格同步的光电容积脉搏波信号(photoplethysmography,PPG)。分别定位ECG和PPG的特征点,计算PPG信号传播延迟(pulse wave transit time,PWTT),并和同一时刻血压值进行相关性分析以及回归分析,建立血压测量模型,即可根据PWTT求得血压。对试验者进行实验表明,采用该便携式无创血压检测装置与传统无创血压测量法对比,误差维持在5%以内。该检测头带信号采集均在头部完成,穿戴方便,功耗低,舒适性强,是一种可行的便携无创连续血压监测装置;同时可将检测结果通过蓝牙实时传至用户手机或PDA装置显示并存储,完成长时间动态血压监护。

Most of the non-invasive blood pressure measurement used in the oscillometric measurement method through a cuff is not convenient. The cuff is inflated and deflated by a pump,which takes a long time and cannot carry out at random. The paper designs a wearable blood pressure monitoring headband and it can measure blood pressure continuously.Firstly,get weak electrocardiogram（ ECG） from head through ADS1292 R,which is a high-accuracy chip used for collecting ECG specially,and get photoplethysmography（ PPG） from the eyebrow using a reflected photoelectric sensor at the same time strictly. Then,find the feature points of ECG and PPG,and calculate the pulse wave transit time（ PWTT） of them. Analyse and create the blood pressure measurement model with the simultaneous blood pressure,and get the result.The error is maintained under 5% between our devise and the traditional equipment. Conclusion： The band collects all signals from head,and with the advantages of being easy to use,with low power,comfort to wear,the headband is feasible and portable. It also can send the result to a mobile phone or a PDA for displaying or recording,and measure the blood pressure for a long time.