Stents, stenting systems, and related methods for agent delivery

A system for insertion into a body lumen for delivering an agent to a site on the body lumen, the system comprising,

• an inner tubular member having a lumen there through for the passage of material;
• a membrane surrounding the inner tubular member;
• an outer tubular member surrounding the inner tubular member and the membrane;
• and
• a porous member forming at least a portion of the outer tubular member, wherein the membrane and the outer tubular member define a chamber there between for holding the agent, wherein the agent in the chamber may pass through the porous member of the outer tubular member and be deposited directly on the body site, and wherein the membrane is non-porous to the agent thereby isolating the lumen of inner tubular member from the agent in the chamber.

A system for delivering an agent to a body site comprising:

• an expandable tube having a lumen there through, wherein the sides of the tube have openings therein to allow passage of material through the lumen;
• an outer membrane surrounding the expandable tube and forming a chamber with a surface of the expandable tube, wherein at least a portion of the membrane is porous to the agent allowing diffusion of the agent there through to the body site, and wherein the expandable tube prevents the agent from diffusing from the chamber and into the lumen of the expandable tube;
• and
• an opening in the chamber allowing delivery of the agent to the chamber.