Electrode assembly in a medical electrical lead
    5.
    发明授权
    Electrode assembly in a medical electrical lead 有权
    医用电极中的电极组件

    公开(公告)号:US09014815B2

    公开(公告)日:2015-04-21

    申请号:US12915631

    申请日:2010-10-29

    摘要: A medical device lead is presented that includes an electrode assembly having a first electrode located near a distal end of the electrode assembly and a second electrode located near a proximal end of the electrode assembly. The electrode assembly also includes a conductive elongated coupler that is electrically coupled to the first electrode and capacitively coupled to the second electrode. At low frequencies and DC (e.g., during delivery of stimulation therapy), the capacitive coupling between the conductive elongated coupler and the second electrode presents a high impedance allowing little current to be redirected from the first electrode to the second electrode. However, at high frequencies (e.g., during an MRI scan) the capacitive coupling between the conductive elongated coupler and the second electrode presents a low impedance, resulting in a significant amount of induced current being redirected to the second electrode and dissipated into bodily fluid surrounding the second electrode.

    摘要翻译: 提供了一种医疗装置引线,其包括具有位于电极组件的远端附近的第一电极的电极组件和位于电极组件的近端附近的第二电极。 电极组件还包括电耦合到第一电极并电容耦合到第二电极的导电细长耦合器。 在低频和DC(例如,在递送刺激疗法期间),导电细长耦合器和第二电极之间的电容耦合呈现高阻抗,允许将电流从第一电极重定向到第二电极。 然而,在高频(例如,在MRI扫描期间),导电细长耦合器和第二电极之间的电容耦合呈现低阻抗,导致大量的感应电流被重定向到第二电极并且耗散到周围的体液中 第二电极。

    ELECTRODE ASSEMBLY IN A MEDICAL ELECTRICAL LEAD
    6.
    发明申请
    ELECTRODE ASSEMBLY IN A MEDICAL ELECTRICAL LEAD 有权
    医用电线中的电极组件

    公开(公告)号:US20110118813A1

    公开(公告)日:2011-05-19

    申请号:US12915631

    申请日:2010-10-29

    IPC分类号: A61N1/05

    摘要: A medical device lead is presented that includes an electrode assembly having a first electrode located near a distal end of the electrode assembly and a second electrode located near a proximal end of the electrode assembly. The electrode assembly also includes a conductive elongated coupler that is electrically coupled to the first electrode and capacitively coupled to the second electrode. At low frequencies and DC (e.g., during delivery of stimulation therapy), the capacitive coupling between the conductive elongated coupler and the second electrode presents a high impedance allowing little current to be redirected from the first electrode to the second electrode. However, at high frequencies (e.g., during an MRI scan) the capacitive coupling between the conductive elongated coupler and the second electrode presents a low impedance, resulting in a significant amount of induced current being redirected to the second electrode and dissipated into bodily fluid surrounding the second electrode.

    摘要翻译: 提供了一种医疗装置引线,其包括具有位于电极组件的远端附近的第一电极的电极组件和位于电极组件的近端附近的第二电极。 电极组件还包括电耦合到第一电极并电容耦合到第二电极的导电细长耦合器。 在低频和DC(例如,在递送刺激疗法期间),导电细长耦合器和第二电极之间的电容耦合呈现高阻抗,允许将电流从第一电极重定向到第二电极。 然而,在高频(例如,在MRI扫描期间),导电细长耦合器和第二电极之间的电容耦合呈现低阻抗,导致大量的感应电流被重定向到第二电极并且耗散到周围的体液中 第二电极。

    Magnetic field detection using magnetohydrodynamic effect

    公开(公告)号:US08467882B2

    公开(公告)日:2013-06-18

    申请号:US13074162

    申请日:2011-03-29

    IPC分类号: A61N1/00

    CPC分类号: A61N1/3718

    摘要: An IMD may transition to an MRI mode automatically in response to detecting one or more conditions indicative of the presence of a strong magnetic field. Large static magnetic fields, such as those produced by an MRI device, may interact with the blood of a patient as it flows through the magnetic field to produce a voltage, a phenomenon referred to as the magnetohydrodynamic (MHD) effect. The voltage produced by the MHD effect is proportional to the strength of the magnetic field. As such, the voltage produced by blood flow in the strong magnetic field of an MRI device may result in a change in a characteristic of an electrogram (EGM). The IMD may detect the change in the characteristic of the EGM caused by the MHD effect and transition to operation in the MRI mode in response to at least the change in the EGM.

    MAGNETIC FIELD DETECTION USING MAGNETOHYDRODYNAMIC EFFECT

    公开(公告)号:US20120253425A1

    公开(公告)日:2012-10-04

    申请号:US13074143

    申请日:2011-03-29

    IPC分类号: A61N1/36

    摘要: An IMD may transition to an MRI mode automatically in response to detecting one or more conditions indicative of the presence of a strong magnetic field. Large static magnetic fields, such as those produced by an MRI device, may interact with the blood of a patient as it flows through the magnetic field to produce a voltage, a phenomenon referred to as the magnetohydrodynamic (MHD) effect. The voltage produced by the MHD effect is proportional to the strength of the magnetic field. As such, the voltage produced by blood flow in the strong magnetic field of an MRI device may result in a change in a characteristic of an electrogram (EGM). The IMD may detect the change in the characteristic of the EGM caused by the MHD effect and transition to operation in the MRI mode in response to at least the change in the EGM.

    MAGNETIC FIELD DETECTION USING MAGNETOHYDRODYNAMIC EFFECT
    10.
    发明申请
    MAGNETIC FIELD DETECTION USING MAGNETOHYDRODYNAMIC EFFECT 有权
    使用磁场动力学效应的磁场检测

    公开(公告)号:US20120253426A1

    公开(公告)日:2012-10-04

    申请号:US13074162

    申请日:2011-03-29

    IPC分类号: A61N1/36

    CPC分类号: A61N1/3718

    摘要: An IMD may transition to an MRI mode automatically in response to detecting one or more conditions indicative of the presence of a strong magnetic field. Large static magnetic fields, such as those produced by an MRI device, may interact with the blood of a patient as it flows through the magnetic field to produce a voltage, a phenomenon referred to as the magnetohydrodynamic (MHD) effect. The voltage produced by the MHD effect is proportional to the strength of the magnetic field. As such, the voltage produced by blood flow in the strong magnetic field of an MRI device may result in a change in a characteristic of an electrogram (EGM). The IMD may detect the change in the characteristic of the EGM caused by the MHD effect and transition to operation in the MRI mode in response to at least the change in the EGM.

    摘要翻译: 响应于检测到指示存在强磁场的一个或多个条件,IMD可以自动地转换到MRI模式。 诸如由MRI装置产生的那些的大静态磁场可以在患者的血液流过磁场时与血液相互作用以产生被称为磁流体动力学(MHD)效应的电压。 由MHD效应产生的电压与磁场的强度成比例。 因此,在MRI装置的强磁场中由血流产生的电压可能导致电描记图(EGM)的特性的变化。 IMD可以根据至少EGM的变化来检测由MHD效应引起的EGM特征的变化以及在MRI模式中的转换到操作。