Drug eluting balloon for the treatment of stenosis and method of manufacturing the balloon

A drug eluting angioplasty balloon suitable to adopt a deployed configuration and a collapsed configuration, the balloon having an outer wall disposed around a core defining an axis, the balloon comprising in the collapsed configuration a plurality of folds that are laid in a tangential direction about the core of the balloon and form a plurality of cavities loaded with a drug, the said cavities are comprised between the said folds, wherein:

• the folds originates from distinct longitudinal lines along the outer wall and are arranged in pairs;
• the folds are circumferentially wrapped about the core in such a way that a fold of one pair overlaps an adjacent fold of another pair, and
• a fold of one pair and the adjacent fold of another pair are wrapped in opposite directions, wherein the folds in one pair are separated by a first gap and a fold of a pair is separated from an adjacent fold of another pair by a second gap, wherein said second gap is greater than said first gap and wherein said cavities are formed between said substantially overlapping folds and said second gaps.