A catheter equipped with a dilatation element comprising, an inner tube having a first lumen open at the distal end, an outer tube which surrounds the inner tube so that a predetermined length of the distal end of the inner tube extends out of the distal end of the outer tube and a second lumen is formed...http://www.google.fr/patents/US5176637?utm_source=gb-gplus-shareBrevet US5176637 - Catheter equipped with a dilation element
