An improved venous ablation catheter and method of use. More particularly, the present invention relates to a radio-frequency ablation catheter that ablates and injects tumescent from inside a vein simultaneously. The catheter device comprises a distal end, proximal end, a needle and lumen for the needle to pass through, and an interior housing. After the vein to be ablated is cannulated and the catheter device is advanced into the vein, the needle is advanced through the venous wall into the peri-venous sheath and tumescent fluid or other fluid or gas is injected around the vein through the needle. The vein segment that has been injected with tumescent is sequentially ablated with the catheter device, and the catheter device is then drawn a distance out of the vein. At this point, the needle can be advanced through the venous wall again injecting tumescent or other fluid. This process can be repeated until the treatment is completed without having to remove the catheter device from the vein, thus requiring only one needle stick and fewer office visits for the patient.
