摘要
近年来,心血管疾病患病人数逐年增加,患病人群往低年龄层发展,对于心血管疾病的监测与治疗迫在眉睫。心冲击图(ballistocardiogram,BCG)采集系统是利用人体重力变化信号诊断心脏疾病的一种全新的无创检测方式。本文设计研制了基于压电薄膜的心冲击图信号采集系统。压电薄膜作为信号采集传感器,将检测到的电荷信号经由电荷灵敏前置放大器,放大(100倍)、滤波(30Hz)、工频陷波后得到可识别心冲击图信号。采集10位健康被试者的BCG信号,同步采集心电(ECG)作为参考,对其心动周期时间间隔进行分析对比,计算均值和方差并作相关性分析。结果表明系统采集BCG信号是有效的,BCG和ECG信号计算心率相关性较大。
In recent years, the number of patients with cardiovascular disease is increasing, and there is an age-decreasing trend. Thus, it＇ s urgent to monitor and treat the cardiovascular diseases. Ballistocardiogram （BCG） signal acquisition system uses the human body gravity variation signal due to hemodynamic activities to diagnosis the cardiac disease noninvasively. In this paper, we presented a BCG system using the PYDF as the sensor. The BCG signal was pre-amplified by a charge sensitive amplifier, filtered by a band pass filter with pass band between 30Hz to 40Hz, and amplified 100 times, then go through a 50Hz notch filter. BCG signals of 10 healthy subjects were recorded with ECG and blood pulse recorded synchronously as reference signals. The mean and variance of the cardiac periods were calculated with BCG and ECG, labeled as CPBCG and CPECG respectively, meanwhile the correlation was analyzed. Results show that the system of BCG signal acquisition is valid; CPBCG was correlative with CPECG.
出处
《生命科学仪器》
2013年第5期57-62,共6页
Life Science Instruments
