Compositions, kits, methods, and apparatus for transvascular delivery of a composition to an extravascular tissue of a mammal

A cardiac isolation catheter insertable within the vena cava of a mammal, the catheter comprising

• (a) a hollow tubular body having a venous blood flow lumen extending longitudinally therein, a proximal end, a distal end, a proximal port, and a distal port;
• (b) a distal vessel seat attached to the body;
• and
• (c) a proximal vessel seat attached to the body;
• wherein the body has an access lumen extending longitudinally therein that communicates with an access port positioned on the body between the distal vessel seat and the proximal vessel seat and that is adapted to accommodate passage of a second catheter therethrough,
• wherein the cardiac isolation catheter is positionable within the vena cava of the mammal such that one vessel seat is positioned in the superior vena cava of the mammal between the right atrium and the junction of the brachiocephalic veins and the other vessel seat is positioned in the inferior vena cava between the right atrium and the hepatic veins,
• wherein the distal port is located distally with respect to the distal vessel seat,
• wherein the proximal port is located proximally with respect to the proximal vessel seat,
• wherein at least one of the distal vessel seat and the proximal vessel seat comprises a pair of closely-spaced raised surfaces, and
• wherein the body has a suction lumen extending longitudinally therein and communicating with a suction port situated between the pair of closely-spaced raised surfaces,
• whereby the vena cava may be securely seated at the vessel seat by application of suction to the suction lumen and blood in the junction of the brachiocephalic veins and blood in the hepatic veins is in fluid communication with the venous blood flow lumen by way of the ports.