A sterile, non-steerable, thin flexible tube intended to be introduced percutaneously into the cardiac anatomy (e.g., coronary sinus) to provide a conduit for the delivery of a cardiac pacing and/or defibrillation lead (not included). It may include additional synergistic catheters and is intended to be introduced through a separate catheter introducer sheath, which may be included along with additional devices dedicated to catheter introduction/function. It does not contain electrodes.