A mini-invasive device (2) for the endourologic treatment, characterized in that it comprises a tubular conduit (4), longitudinally flexible, intended to be inserted through and cross the operating channel (8) of an endoscope (10), and in that said tubular conduit (4): - internally defines a substantially non-deformable lumen, - has a portion (14), that in operation is the proximal one, comprising a connector (30) for the connection to suction means, - has a portion (12), that in operation is the distal one, intended to project from the distal tip of said endoscope (10), - internally delimits a suction conduit (5) within which at least one tool (33, 41) used in the endourologic treatment can be removably inserted.
