Balloon expandable braided stent with restraint

摘要

A method of making a balloon expandable braided stent with a restraint to initially prevent self-expansion and the resulting product. Multiple strands 12, 13, 14 and 15 of a resilient metal or plastic are braided to form a tubular configuration 10 of a predetermined outside diameter which assumes a lesser diameter when the tubular stent is longitudinally stretched. When in its stretched condition, it is coated with a polymeric material 24 which is then cross-linked to effectively "freeze" the intersections of the braided structure holding it in its reduced diameter configuration. The tubular stent is designed to be placed within a body vessel using a balloon stent delivery catheter. When the balloon surrounded by the braided wire stent is inflated, the stent expands initially to an extent to break the bonds of plastic material between the intersections of the strands, thereby permitting self-expansion to take place. The coating may also comprise a hydrogel or an elastomeric impregnated with the water soluble particles which softens and/or deteriorates upon exposure to an aqueous media, such as blood.