Instrument (1, 203, 204) for endoscopic applications comprising a tube type element comprising three coaxial cylindrical elements, that is an internal cylindrical element (2), an intermediate cylindrical element (3), and an external cylindrical element (4) ； the internal cylindrical element (2) comprising a first terminal part of the rigid internal element (21) in a terminal manipulation part (141； 161) of the instrument, a first part of the flexible internal element (22), a part of the internal element intermediate rigid (23), a second part of the flexible internal element (24), and a second terminal part of the rigid internal element (25) in an actuating terminal part (145； 165) of the instrument； the cylindrical intermediate element (3) comprising a first terminal part of the rigid intermediate element (31) in the terminal handling part (141； 161) of the instrument, and a second terminal part of the rigid intermediate element (35) in the terminal part of actuation (145； 165) of the instrument that is connected to the first terminal part of the rigid intermediate element (31) through at least three longitudinal elements (38； 60； 70； 80； 90； 100； 110； 130), each of the at least three longitudinal elements (38； 60； 70； 80； 90； 100； 110； 130) is connected to both the first terminal part of the rigid intermediate element (31) and the second terminal part of the intermediate element rigid (35)； the external cylindrical element (4) comprising a first terminal part of the rigid external element (41) in the terminal manipulation part of the instrument, a first part of the flexible external element (42), a part of the intermediate rigid external element (43) , a second part of the flexible external element (44), and a second terminal part of the rigid external element (45) in the terminal part of actuation of the instrument； the first terminal part of the rigid internal element (21), the first terminal part of the rigid intermediate element (31) and the first terminal part
