Minimally invasive medical device and method for delivery of therapeutic or diagnostic agents into a vessel wall

A minimally invasive device for delivering therapeutic or diagnostic agents into a vessel wall, comprising:

• an introducer tube;
• a tubular member having a proximal end, a distal end, and a first lumen extending therebetween, the tubular member slidably disposed within the introducer tube;
• a plurality of hollow delivery struts disposed on the distal end of the tubular member and in fluid communication with the first lumen, each hollow delivery strut adapted to pierce through inner most layers of the vessel wall, and each comprising:
• at least one exit port, and
• an extension at a distal portion of at least one of the hollow delivery struts, the extension comprising at least one other exit port in fluid communication with the hollow delivery strut,
• wherein the extension is a stopper to prevent the delivery strut from piercing through the outer most layers of the vessel wall, the stopper extending from the hollow delivery strut and positioned at a distance of from about 5 mm to about 0.5 mm from a distal tip of the hollow delivery strut.