头带式连续血压检测装置设计

Design of A Headband Device with Continuous Blood Pressure Detection

本文设计了一种基于脉搏波传导时间、能够对血压进行长时间连续测量的头带式装置。与传统信号采集方式不同,本装置信号的采集位置均在人体头部,通过嵌入在头带中的心电电极传感器和反射式脉搏波传感器分别采集心电信号(electrocardiogram、ECG)和光电容积脉搏波信号(photoplethysmography、PPG),并对二者进行特征点提取,测量心电信号的R波峰值和脉搏波信号最大值点之间的时间差得到脉搏波传导时间(pulse transit time、PTT)。基于动脉血压和脉搏波传导时间(PTT)之间的线性模型,利用脉搏波传导时间与水银血压计测得的收缩压和舒张压进行回归分析,得到收缩压和舒张压的计算公式。针对个体的实验结果分析表明,本装置与水银血压计测得数据误差在10mm Hg之内,能够满足AAMI国际标准对无创血压监测误差的要求。

In this paper, a headband device to realize the long time continuous detection of blood pressure was designed based on pulse wave transmission time（PTT）. Different with the traditional signal acquisition method, the collection positions of the device were all located in the human head. The ECG signal and PPG signal were collected respectively by the electrode sensors and refl ex pulse wave sensor embedding in the belt at the same time, and then the characteristic points were extracted to obtain PPT by calculating the time gap between the peak of R-wave in ECG signal and the maximum point in PPG signal. We performed regression analysis by systolic blood pressure（SBP） and diastolicblood pressure（DBP） measured by PTT and a mercury sphygmomanometer based on the linear model between the arterial blood pressure and PTT and acquire the calculation formula. The experimental results indicated that the difference of SBP measured by the system and by the mercury sphygmomanometer was less than 10 mmHg, which could meet the AAMI requirement of noninvasive blood pressure measurement.