Apparatus for replacement of an electrode at a desire location in the atrium

An atrial pacing lead system for accurately locating an atrial pacing electrode in the atrial septum adjacent and substantially above the ostium of the coronary sinus comprising:

• an atrial pacing lead having an electrode located on a distal portion thereof and a guide catheter having means for deflecting a distal portion to form a serpentine configuration upon deployment that locates the distal end of the catheter proximate the ostium of the coronary sinus, and having a longitudinal lumen with an aperture proximal the distal end of the catheter through which the atrial pacing lead is to be passed and the distal portion of the lead advanced from the aperture to imbed the aperture in the atrial septum at the desired location, and wherein said serpentine configuration forms a generally S-shaped structure at the distal portion of the catheter.

An atrial pacing lead system for accurately locating an atrial pacing electrode in the atrial septum, adjacent and above the ostium of the coronary sinus, comprising:

• an atrial pacing lead having an electrode located on a distal portion thereof;
• and
• a guide catheter having (i) a straight outer tubular member, and (ii) an inner tubular member that extends within the outer tubular member, said inner tubular member including means for deflecting a distal portion to form upon deployment a serpentine configuration with first and second, generally planar oppositely directed curves that. locate a distal end of the catheter proximate the ostium of the coronary sinus and further having a longitudinal lumen with a lateral aperture proximal to the distal end of the catheter through which the atrial pacing lead is to be passed and the distal portion of the lead advanced from the lateral aperture to embed the electrode in the atrial septum at a desired location.