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    • 10. 发明申请
    • LEAD FOR USE IN RF FIELD
    • 用于射频场领域
    • WO2011014465A3
    • 2011-05-05
    • PCT/US2010043288
    • 2010-07-27
    • PROTEUS BIOMEDICAL INCZDEBLICK MARKTHOMPSON TODD
    • ZDEBLICK MARKTHOMPSON TODD
    • A61B5/055A61B5/0402A61B5/0408
    • A61N1/05A61N1/086
    • A lead such as used for pacemaking or neural stimulation has a current block IC which blocks current when RF is detected. In this way problems of tissue heating are reduced or eliminated when the patient carrying such a lead is given an MRI. The lead may also detect localized temperature, to be reported to equipment external to the lead. This may permit more judicious use of the RF energy, for example during an MRI session. Localized and spurious tissue heating nearby to an electrode of a lead, due to RF energy from an MRI, is reduced or eliminated by detecting the RF field, deriving energy from the field, and actively driving a node that is coupled to such an electrode so as to minimize voltage excursions at the electrode. A state is maintained or set within electronics nearby to an electrode of a lead, so that a can which connects with the lead is able to learn whether an MRI event has occurred since the last time that the can had sent commands to the electronics to set particular internal states. For a lead that delivers pacing pulses, a pacing detector is provided in addition to an MRI detector, and the blocking action is carried out most of the time but is disabled briefly for each pacing pulse. During a time of presence of RF energy, a bucking circuit attempts, to the extent possible, to drive a node toward blood potential, the node capacitively coupled with electrodes of the lead.
    • 诸如用于起搏或神经刺激的导联具有电流阻断IC,其在检测到RF时阻断电流。 以这种方式,当携带这样的导线的患者被给予MRI时,组织加热的问题被减少或消除。 导联还可以检测局部温度,并将其报告给导联外部的设备。 这可以允许更明智地使用RF能量,例如在MRI会话期间。 通过检测RF场,从场获得能量并且主动驱动耦合到这样的电极的节点,减少或消除了由于来自MRI的RF能量而导致的导线电极附近的局部和虚假组织加热 以最小化电极处的电压偏移。 状态被维持或设置在导线的电极附近的电子器件中,使得与导线连接的罐能够获知自上次能够向电子设备发送命令以设定MRI事件是否已经发生 特定的内部状态。 对于提供起搏脉冲的导线,除MRI检测器外还提供起搏探测器,大部分时间进行阻断动作,但对每个起搏脉冲暂时禁用。 在存在RF能量期间,补偿电路尽可能尝试将节点驱动至血压,该节点与引线的电极电容耦合。