Methods and apparatus for advancing catheters through severely occluded
body lumens
    55.
    发明授权
    Methods and apparatus for advancing catheters through severely occluded body lumens 失效
    通过严重闭塞的体腔推进导管的方法和装置

    公开(公告)号:US5419767A

    公开(公告)日:1995-05-30

    申请号:US111367

    申请日:1993-08-24

    摘要: A catheter system is provided that includes an electrode array near the distal end of the catheter. High frequency current is supplied between the electrodes of the array and a common electrode to cause heating of material lying between the electrodes. The catheter may include means for steering it through the lumen. In a preferred embodiment, the steering means includes a plurality of steering wires in contact with the catheter body. The steering wires may be formed of a shape-memory alloy. Wires of such an alloy may be made to contract when heated above a preselected transition temperature. The wires may be heated by the selective conduction of electrical current through them. Conduction of current through the steering wires is controlled based on the current flowing through the electrodes of the array. An inflatable balloon may be included proximal to the electrode array for dilating the vessel after the occlusion has been penetrated by the electrode array. The balloon may be shielded and protected behind a portion of the catheter having a diameter greater than the diameter of the uninflated balloon disposed about the catheter body. The catheter will include means for protecting the walls of the vessel from exposure to electrical current from the electrodes. This will commonly include switching means or other means for current control. The vessel wall may also be protected by setting the electrodes back some distance from the outer edge of the distal tip.

    摘要翻译: 提供了一种导管系统,其包括靠近导管远端的电极阵列。 在阵列的电极和公共电极之间提供高频电流以引起位于电极之间的材料的加热。 导管可以包括用于使其通过管腔的装置。 在优选实施例中,转向装置包括与导管主体接触的多个操纵线。 转向线可以由形状记忆合金形成。 当加热到预选的转变温度以上时,可使这种合金的电线收缩。 可以通过选择性地导通电流来加热导线。 基于流过阵列电极的电流来控制通过导线的电流传导。 可以在电极阵列附近包括可充气气球,用于在闭塞已经被电极阵列穿透之后扩张血管。 导管的一部分的直径大于设置在导管主体周围的未膨胀球囊的直径的一部分导管上的气囊可被屏蔽和保护。 导管将包括用于保护容器壁免受来自电极的电流的装置。 这通常包括开关装置或其他用于电流控制的装置。 血管壁也可以通过将电极设置回远离远端尖端的外缘一些距离来保护。

    Thermal dilatation catheter and method
    56.
    发明授权
    Thermal dilatation catheter and method 失效
    热膨胀导管及方法

    公开(公告)号:US5178620A

    公开(公告)日:1993-01-12

    申请号:US660320

    申请日:1991-02-22

    摘要: This invention provides a method and an apparatus for selectively heating a resistive mass which partially or fully occludes a particular tubal passage, such as a blood vessel or the urethra. As a result, the tubal passage is effectively softened or weakened, allowing the tubal passage to be more readily recanalized by expansion of a balloon or other dilatation means. This invention also provides a method and an apparatus for effectively boring through a partially or fully occluded tubal passage by simultaneously applying both (1) heat to the occlusive mass surrounding the tip of the catheter and (2) pressure against the mass within the partially or fully occluded passage.

    摘要翻译: 本发明提供了一种方法和装置,用于选择性地加热部分或完全闭塞特定输卵管通道(例如血管或尿道)的电阻质量块。 结果,输卵管通道被有效地软化或减弱,允许输卵管通道更容易通过气囊或其他扩张装置的膨胀再通。 本发明还提供了一种用于通过同时将(1)热施加到围绕导管尖端的闭塞质量的部分或完全闭塞的输卵管通道的有效钻孔的方法和装置,以及(2) 完全闭塞通道。