| 摘要 |
An implantable endocardial lead includes an electrical conductor coupled at its distal end to an active fixation electrode movable between a retracted position and an extended position advanced beyond the lead end for penetration into the myocardial tissue. A resilient coupling mechanism maintains electrical continuity between the active fixation electrode and an electrically active housing throughout movement of the electrode. In one instance, a conductive coupling is slidably received on a conductive shaft and is fixed to the electrically active housing. A compression spring is received on the conductive shaft intermediate and engaged with the conductive coupling and with a conductive ring stop member projecting radially from the conductive shaft. In another instance, an annular track member integral with the electrically active housing has an annular recess surrounding the conductive shaft and a metallic coil spring is received in the annular recess and slidably engageable with the conductive shaft.
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