一种应用于体外自动除颤器的经胸阻抗测量系统

Transthoracic Impedance Measurement System Applied to Automated External Defibrillators

目的探索一种减少体外自动除颤器(Automated External Defibrillator,AED)的传统经胸阻抗测量方法向患者施加的过多电流激励刺激,增加经胸阻抗测量的时效性,减小经胸阻抗测量与除颤间的时间间隔的系统。方法基于AED的硬件电路原理,提出与除颤过程相结合的经胸阻抗测量系统,系统由高压检测电路、除颤电流检测电路、AD采集与数据处理等部分构成,在除颤放电的开始阶段,利用除颤的电压和电流对患者的经胸阻抗进行测量。结果经模拟阻抗测量验证,经胸阻抗测量系统的测量误差小于4Ω,满足AED功能需求。结论本研究应用于AED的经胸阻抗测量系统有效避免了患者接受更多不必要的电流刺激,同时缩短了测量与除颤间的时间间隔,测量时效性更高,对AED经胸阻抗测量技术的发展有一定参考意义。

Objective To explore a system that can reduce the excessive stimulation of electric current applied to patients by traditional transthoracic impedance measurement method of automated external defibrillator(AED),increase the timeliness of transthoracic impedance measurement and reduce the time interval between transthoracic impedance measurement and defibrillation.Methods The transthoracic impedance measurement system was designed based on the circuit principle of AED and combined with the defibrillation process.The system was composed of high voltage detection circuit,defibrillation current detection circuit,AD acquisition and data processing.The characteristic of the system was that the transthoracic impedance was measured by the voltage and current of defibrillation at the beginning of defibrillation discharge.Results The measurement error of the thoracic impedance measurement system was less than 4Ωafter the simulation impedance measurement,which met the functional requirements of AED.Conclusion This system effectively avoided the patients from receiving more unnecessary current stimulation,shortened the time interval between measurement and defibrillation,and had better timeliness of measurement.It has certain reference significance for the development of AED transthoracic impedance measurement technology.