Intravascular deliverable stent for reinforcement of abdominal aortic aneurysm

A catheter deliverable stent for treating an abdominal aortic aneurysm comprising:

• (a) an innermost tubular structure of a first length, the innermost tubular structure comprising a first plurality of braided wire strands of a shape memory alloy, the braid having a predetermined pick and pitch to define openings sufficiently large so as to not materially impede blood flow therethrough;
• (b) at least one further tubular structure of a predetermined diameter placed in surrounding relationship with a predetermined length portion less than the first length of the innermost tubular structure, the further tubular structure comprising a second plurality of braided wire strands greater in number than said first plurality, also of a shape memory alloy, the braid of the further tubular structure having pick and pitch to define openings sufficient small so as to substantially preclude blood flow therethrough;
• (c) wherein longitudinal stretching of the innermost and further tubular structures reduces an outer diameter of the stent sufficiently to allow it to be loaded into a lumen of an intravascular delivery catheter and release of the stent from the delivery catheter allows the outer diameter to expand back to said predetermined diameter.