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    • 33. 发明申请
    • LEAD FOR USE IN RF FIELD
    • 用于射频场的引线
    • WO2011014464A2
    • 2011-02-03
    • PCT/US2010/043286
    • 2010-07-27
    • PROTEUS BIOMEDICAL, INC.ZDEBLICK, MarkTHOMPSON, Todd
    • ZDEBLICK, MarkTHOMPSON, Todd
    • 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引线具有当检测到RF时阻止电流的电流块IC。 以这种方式,当携带这种铅的患者被给予MRI时,组织加热的问题被减少或消除。 铅也可能检测局部温度,报告给铅外部的设备。 这可以允许更准确地使用RF能量,例如在MRI期间。 通过检测RF场,从场导出能量,并主动驱动耦合到这样一个电极的节点,减少或消除了来自MRI的RF能量附近的引线附近的局部和杂散组织加热 以最小化电极处的电压偏移。 在铅电极附近的电子设备内维持或设置状态,使得与引线连接的罐能够从上次发送命令到电子设备以后是否发生了MR​​I事件 特定的内部状态。 对于提供起搏脉冲的引线,除了MRI检测器之外还提供起搏检测器,并且阻塞动作在大部分时间内被执行,但是对于每个起搏脉冲被短暂地禁止。 在存在RF能量的时间期间,降压电路尽可能尝试将节点驱动到血液电位,该节点与电极的电极电容耦合。