J-shaped coronary sinus lead

A cardiac pacing lead for implant in a patient's coronary sinus of a patient's heart, comprising:

• an elongated lead body having an outer insulative layer extending over a proximal section and including a pair of elongated conductors therein extending from a proximal end to a distal end;
• and
• a tip electrode carried on the distal end of the lead body and coupled to one of the conductors;
• and
• an elongated indifferent electrode carried on the lead body proximal to the tip electrode and distal to the proximal section having the outer insulative layer, the indifferent electrode being coupled to the other of the conductors;
• a portion of the lead body proximal to the tip electrode and distal to the outer insulative layer being configured as a curved, J-shaped segment, the curved portion having a radius of curvature such that, when the tip electrode is positioned during implant adjacent a wall of the coronary sinus closest to the left atrium, the tip electrode extends proximally and the proximal end of the indifferent electrode lies generally along the wall of the coronary sinus closer to the ventricle and curves away from the wall of the coronary sinus to extend generally perpendicular to it.

A cardiac pacing lead for implant in a patient's coronary sinus of a patient's heart, comprising:

• an elongated lead body having an outer insulative layer extending over a proximal section and including a pair of elongated conductors therein extending from a proximal end to a distal end;
• and
• a tip electrode carried on the distal end of the lead body and coupled to one of the conductors;
• and
• an elongated indifferent electrode carried on the lead body proximal to the tip electrode and distal to the proximal section having the outer insulative layer, the indifferent electrode being coupled to the other of the conductors;
• a portion of the lead body proximal to the tip electrode and distal to the outer insulative layer being configured as a curved, J-shaped segment, the curved portion having a radius of curvature such that, when the tip electrode is positioned during implant adjacent a wall of the coronary sinus closest to the left atrium, the tip electrode extends distally and the proximal end of the indifferent electrode lies generally along the wall of the coronary sinus closer to the ventricle and curves away from the wall of the coronary sinus to extend toward the wall of the coronary sinus adjacent the atrium.