RF rejecting lead

A lead assembly for an implantable medical device, the lead assembly comprising:

• a lead body having a first portion and a second portion, the first portion adapted for coupling to a pulse generator and the second portion adapted for implantation in or near a heart;
• first and second electrodes located at the second portion, wherein the second electrode is distal to the first electrode;
• and
• a first means for blocking RF currents coupled to the first and second electrodes, wherein the first means for blocking RF currents includes first and second co-radial conductive coils positioned within the lead body, wherein the second conductive coil is coupled to the second electrode, and wherein the first conductive coil extends past the first electrode to between the first electrode and the second electrode and transitions to a non-coiled region, which extends back to and couples to the first electrode.

A lead assembly for an implantable medical device, the lead assembly comprising:

• a lead body having a first portion and a second portion, the first portion adapted for coupling to a pulse generator and the second portion adapted for implantation in or near a heart;
• first and second co-radial conductive coils positioned within the lead body and electrically isolated from each other, wherein the first and second conductive coils include a first and second number of coil turns, the first and second number of coil turns include a number of matched turns and a number of unmatched turns, and the number of unmatched turns divided by the total number of unmatched and matched turns is less than approximately 1.5%;
• a first electrode located at the second portion and coupled to the first conductive coil;
• and
• a second electrode located at the second portion and coupled to the second conductive coil,
• wherein the first conductive coil extends past the first electrode to between the first electrode and the second electrode and transitions to a non-coiled region, which extends back to and couples to the first electrode.