| 摘要 |
A transvenous implantable defibrillation lead (10) includes a conductor (12) and inner and outer coaxial cylindrical electrodes (16, 20). The inner electrode (16) is connected to the conductor (12), and the outer electrode (20) is connected to a sheath (18) overlying the conductor in rotatable relationship thereto. The sheath is fixed to the outer cylindrical electrode so that rotation of the sheath relative to the conductor results in rotation of the inner and outer cylindrical electrodes relative to each other. The inner electrode has a plurality of hooks (22) extending generally transversely and tangentially thereto, with the hooks being biased such that the terminal ends of the hooks tend to spring outwardly from the inner electrode. The hooks (22) are constrained against the inner cylindrical electrode (16) by the outer cylindrical electrode (20), except that a window (24) in the outer electrode permits the hooks (22) to spring outwardly therethrough upon rotation of the outer electrode (20) relative to the inner electrode (16). Once the hooks are so exposed, rotation of the inner and outer electrodes in unison permits the hooks to engage cardiac tissue. The hooks (22) provide fixation as well as conducting electrical stimulus to the cardiac tissue.
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