A method and dissecting device are disclosed for treating a stenotic vessel. The method including inserting a first dissecting member into a subintimal space of a blood vessel and a second dissecting device configured to be received within a lumen within the first dissecting device and inserted into the blood vessel in a bent state； dissecting an inner side of the subintimal space from an outer side of the subintimal space over an entire circumference of the blood vessel with the first dissecting device； and removing the dissected inner side of the subintimal space and a stenotic region attached to the inner side of the subintimal space from the blood vessel.
