Methods for venous occlusion for the treatment of venous insufficiency

A method of treating a vein, comprising the steps of:

• creating an occlusion in a vein by compressing a portion of the vein;
• positioning a distal end of a catheter to define a first volume within the vein between a proximal side of the occlusion and the catheter;
• and
• introducing media from the catheter into the vein such that the media flows in a proximal direction after reaching the proximal side of the occlusion, thereby moving pre-existing blood in the vein in a proximal direction to reduce the amount of blood mixing with the media;
• wherein the media has a second volume that is at least about 110% of the first volume.

A method of treating a vein, comprising the steps of:

• creating an occlusion in a vein;
• positioning a distal end of a catheter within the vein at a location proximal to a proximal side of the occlusion, the catheter having a distal opening and a side wall;
• and
• introducing media through the distal opening in a volume such that the media flows in a proximal direction after reaching the proximal side of the occlusion, thereby displacing pre-existing blood in the vein and reducing the amount of blood mixing with the media, and wherein the volume of media introduced is sufficient to advance proximally around the catheter between the sidewall of the catheter and a wall of the vein.