Patent ID: 8521305

Claim:
A lead comprising: an elongated body having a distal end, a proximal end, and a hollow interior extending longitudinally therein; a plurality of electrodes on a distal portion of the elongated body adjacent the distal end, the plurality of electrodes being spaced from the distal end of the elongated body and from each other by electrically nonconductive segments, wherein the elongated body includes an anchor segment disposed between the distal end and a first electrode of the plurality of electrodes which is closest to the distal end, the anchor segment having a plurality of lobes which are separated from each other by slits and which are movable between a collapsed position and an expanded position, the first electrode being spaced from the distal end by a maximum distance in the collapsed position, the first electrode being spaced from the distal end by a reduced distance smaller than the maximum distance in the expanded position in which the lobes expand outwardly relative to a longitudinal axis of the elongated body; a positioning mechanism disposed inside the hollow interior of the elongated body and at least partially within the anchor segment, the positioning mechanism having a distal positioning portion attached to the distal end of the elongated body and a proximal positioning portion which is movable relative to the distal positioning portion; and a control member connected with the proximal positioning portion of the positioning mechanism and to move the proximal positioning portion relative to the distal positioning portion so as to control the positioning mechanism to pull the distal end in a proximal direction toward the proximal end so as to move the lobes of the anchor segment from the collapsed position to the expanded position and to push the distal end in a distal direction away from the proximal end so as to move the lobes of the anchor segment from the expanded position to the collapsed position.