Drug-eluting sheath

A drug-eluting sheath for treating the condition of tubular tissue, the sheath comprising:

• an elastic inner layer;
• a therapeutic agent layer deposited on at least part of the elastic inner layer;
• and an elastic outer layer deposited on the elastic inner layer and the therapeutic agent layer;
• and the elastic inner layer material has first elongation-at-break percentage, and the elastic outer layer material has second elongation-at-break percentage.

A drug-eluting sheath for treating condition of tubular tissue, the sheath comprising:

• an elastic inner layer;
• a therapeutic agent layer deposited on at least part of the elastic inner layer;
• and
• an elastic outer layer deposited on the elastic inner layer and the therapeutic agent layer, material of the elastic outer layer is natural or artificially synthesized polymer adhesive substance;
• wherein the sheath is put on at least part of the balloon of the balloon catheter, and balloon catheter is made through the installation of a balloon on the peripheral of a conduit;
• under the compression due to the swelling of balloon, the adhesiveness of the elastic outer layer helps the sheath the adhere to the inner wall of the blood vessel or the inner wall of other tubular tissue, consequently, therapeutic agent is eluted slowly to the tissue at specific spot and on the expected time period.