Catheters having visible markers for identifying soaker regions containing fluid openings

A catheter for delivering fluids comprising:

• a hollow tube having a proximal section, a distal section, and an elongated lumen that extends through the hollow tube from the proximal section to the distal section;
• one or more fluid openings formed in the distal section of the hollow tube and are in fluid communication with the elongated lumen;
• a visible marker collar disposed on an outer surface of the hollow tube, wherein the visible marker collar is located at a junction of the proximal and distal sections of the hollow tube;
• and
• a visible marker filament disposed within the elongated lumen of the hollow tube and extending between the junction and a distal end of the hollow tube.

A catheter for delivering fluids comprising:

• a hollow tube having a proximal section, a distal section, and an elongated lumen that extends through the hollow tube from the proximal section to the distal section;
• one or more fluid openings formed in the distal section of the hollow tube and are in fluid communication with the elongated lumen of the hollow tube;
• and
• a visible marker filament disposed within the elongated lumen of the hollow tube and extending between a junction of the proximal and distal sections of the hollow tube and a distal end of the hollow tube.