A catheter for delivering an agent to an injection site in a wall of a patient's body lumen, with an elongated shaft having a needle-through lumen slidably containing a needle therein, and an expandable member on the distal shaft section which has a collapsed configuration and a radially expanded configuration....http://www.google.fr/patents/US8075519?utm_source=gb-gplus-shareBrevet US8075519 - Agent delivery catheter having a radially expandable centering support members
Agent delivery catheter having a radially expandable centering support members
