The present disclosure is directed to a system for treating a blood vessel including a blood vessel lumen defined by a blood vessel wall, the blood vessel lumen being at least partially obstructed. The system may include a shaft assembly including an orienting element. The system may also include a re-entry device extending into the central lumen. The re-entry device may comprise a core wire configured such that bending stresses created in the core wire during bending about a design bend radius are less than the elastic limit of the core wire so that the core wire will elastically recover from the bending upon release.
