Active fixation lead having a rotatable curve

An implantable lead having a proximal section, a distal section, and a curved section between the proximal section and the distal section, the implantable lead comprising:

• an outer tubular portion extending from the proximal section to the distal section, the outer tubular portion defining an exterior surface of the implantable lead, the outer tubular portion having a bias such that the implantable lead assumes a curved shape along the curved section;
• an inner tubular portion extending within the outer tubular portion, the inner tubular portion comprising an inner coil conductor and an inner polymer jacket over the inner coil conductor along the curved section, the inner coil conductor extending from the proximal section to the distal section, the inner polymer jacket having a plurality of slots along the curved section that increases the flexibility of the inner tubular portion;
• and
• at least one electrical element in electrical connection with the inner coil conductor, the at least one electrical element configured to deliver electrical energy to tissue, wherein the inner tubular portion is rotatable relative to the outer tubular portion and the inner tubular portion is less stiff relative to the outer tubular portion along the curved section such that the curved shape is substantially maintained when the inner tubular portion is rotated relative to the outer tubular portion.

An implantable lead having a proximal section, a distal section, and a curved section between the proximal section and the distal section, the implantable lead comprising:

• a outer tubular portion extending from the proximal section to the distal section, the outer tubular portion defining an exterior surface of the implantable lead, the outer tubular portion having a bias such that the implantable lead assumes a curved shape along the curved section;
• an inner tubular portion extending within the outer tubular portion, the inner tubular portion comprising an inner coil conductor and an inner polymer jacket over the inner coil conductor along the curved section, the inner tubular member stiffer along the proximal section than the curved section, the outer tubular portion stiffer along the curved section relative to the inner tubular portion along the curved section such that the inner tubular portion can rotate relative to the outer tubular portion while the curved shape is substantially maintained;
• and
• an active fixation element on the distal end, the active fixation element in electrical connection with the inner coil conductor and configured to deliver electrical energy to tissue, the fixation element configured to affix to tissue by rotation of the inner tubular portion relative to the outer tubular member.