Devices and methods are described for penetrating hard plaque that partially or completely occludes blood vessels and disturbs blood flow through the blood vessel. The device includes a distal pre-loaded spring that can store energy and release it as impact at the device distal tip, in order to penetrate or break through hard plaque that is blocking blood path in blood vessels.L'invention concerne des dispositifs et des méthodes permettant de pénétrer la plaque dure qui obstrue partiellement ou totalement des vaisseaux sanguins et en perturbe le débit du sang. Le dispositif comprend un ressort distal préalablement chargé capable de stocker de l'énergie et de la libérer sous forme d'impact afin de pénétrer ou de briser la plaque dure obstruant le vaisseau et le débit sanguin.
