Importance

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Abstract

A body-implantable transvenous endocardial lead for an implantable medical device system. The lead includes inner and outer coiled conductors each surrounded by a flexible elongate sheath such that the inner conductor is rotatable within the outer sheath. An electrode assembly disposed at the distal end of the lead includes a distally-projecting fixation helix. A sliding member in the electrode assembly includes a helix-engaging collar for engaging the coils of the fixation helix, such that when the helix is rotated in a first direction with respect to the sliding member, it is advanced in a screw-like fashion distally forward with respect to the sliding member, and when the helix is rotated in a second direction with respect to the sliding member, it is retracted proximally backward with respect to the sliding member. A tip electrode is disposed on the distal end of the sliding member. When the helix is fully retracted, the helix-engaging collar is disposed substantially at the distal end of the helix such that the tip electrode extends distally beyond the distal end of the helix. When the helix is fully advanced, the helix engaging collar and the electrode are positioned substantially within the helix.

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First Claim