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    • 9. 发明申请
    • Intracardiac impedance and its applications
    • 心内阻抗及其应用
    • US20070043394A1
    • 2007-02-22
    • US11208922
    • 2005-08-22
    • Yunlong ZhangJames GilkersonYongxing ZhangBoyce Moon
    • Yunlong ZhangJames GilkersonYongxing ZhangBoyce Moon
    • A61N1/39
    • A61N1/3962A61N1/3621A61N1/36521A61N1/3925
    • A system to measure intracardiac impedance includes implantable electrodes and a medical device. The electrodes sense electrical signals of a heart of a subject. The medical device includes a cardiac signal sensing circuit coupled to the implantable electrodes, an impedance measurement circuit coupled to the same or different implantable electrodes, and a controller circuit coupled to the cardiac signal sensing circuit and the impedance measurement circuit. The cardiac signal sensing circuit provides a sensed cardiac signal. The impedance measurement circuit senses intracardiac impedance between the electrodes to obtain an intracardiac impedance signal. The controller circuit determines cardiac cycles of the subject using the sensed cardiac signal, and detects tachyarrhythmia using cardiac-cycle to cardiac-cycle changes in a plurality of intracardiac impedance parameters obtained from the intracardiac impedance signal.
    • 测量心内阻抗的系统包括可植入电极和医疗装置。 电极感测受试者心脏的电信号。 医疗装置包括耦合到可植入电极的心脏信号感测电路,耦合到相同或不同可植入电极的阻抗测量电路,以及耦合到心脏信号感测电路和阻抗测量电路的控制器电路。 心脏信号感测电路提供感测的心脏信号。 阻抗测量电路感测电极之间的心内阻抗,以获得心内阻抗信号。 控制器电路使用感测到的心脏信号来确定受试者的心脏周期,并且使用从心脏内阻抗信号获得的多个心内阻抗参数中的心脏周期与心脏周期变化来检测快速性心律失常。