Angioplasty device comprising: - a guidewire intended to be inserted into a blood vessel, - a flexible tubular body (1) extending along a longitudinal axis (2) between a proximal end (3) and a distal end (4) and having a proximal portion (3A) including the proximal end (3) and a distal portion (4A) including the distal end (4), the tubular body (1) comprises: - an inflatable balloon (5) disposed radially around the tubular body (1) in the distal portion (4A) and apt to be inflated to increase the inner diameter of the blood vessel； - a first airtight inner conduit (6) extending parallel to the longitudinal axis (2) at least in the distal portion (4A) and opening, on the one hand at the proximal end or in an intermediate position between the proximal end and the inflatable balloon (5) and secondly at the distal end (4) to allow insertion of the guidewire into the first passage and the sliding of the tubular body along the guidewire； - at least a second conduit (7) internal hermetic extending parallel to the longitudinal axis (2) which opens on one side at the proximal end (3) and on the other hand in the ball (5) for sealingly connecting the proximal end (3) the tubular body to the inflatable balloon (5) and allow injection of a fluid into the balloon； - one or more injection orifices (12) located in the distal portion (4A) and including at least one injection port downstream (12B) located downstream of the ball (5) and / or at least one injection orifice water above (12B) located upstream of the ball (5)； and - a third conduit (8) internal hermetic which opens on one side at the proximal end (3) and secondly on or the injection holes (12) to allow the injection of a contrast medium through or of the injection holes (12) when the wire guide is in the first conduit and the inflatable balloon (5) is deflated, the third conduit (8) is not open in the first conduit (6).Dispositivo de angioplastia que comprende: - una guía de alambre destinada a ser insertada en un vaso s
