Distal scanning module, in particular to control the aiming and the movement of an optical apparatus of a medical device, such as a diagnostic or surgical instrument; said module comprising: - an oblong structure; and - an optical apparatus, associated with said oblong structure for facing a segment arranged inside a body cavity of a patient; - an actuating device, for controlling the position of said oblong structure so as to orient said optical apparatus in said body cavity; wherein: - said oblong structure has a proximal portion and an end portion, which is at least partially deformable, and - said actuating apparatus comprises at least one movable pusher member (22; 22') which moves in a guided manner relative to said oblong structure and is suited to act upon said end portion, so as to angularly move said end portion from said bent condition towards a substantially straight condition, in which said end portion is caused to be aligned with said proximal portion; said module being characterized in that: - said oblong structure is a beam-shaped element which is continuously deformable along its entire extension and which tends to remain in and elastically return to a bent condition, in which said end portion is normally flexed relative to said proximal portion; and - said actuating apparatus comprises a pair of said pusher member (22, 22'), each of them being placed outside said oblong structure and being suited to stress said end portion in a flexing manner on a respective plane and to determine a respective degree of freedom of angular movement of said end portion on said plane; the two planes on which said end portion is configured to be stressed in a flexing manner are perpendicular to one another. - an oblong structure; and - an optical apparatus, associated with said oblong structure for facing a segment arranged inside a body cavity of a patient; - an actuating device, for controlling the position of said oblong structure so as to orient said optical apparatus in said body cavity; - said oblong structure has a proximal portion and an end portion, which is at least partially deformable, and - said actuating apparatus comprises at least one movable pusher member (22; 22') which moves in a guided manner relative to said oblong structure and is suited to act upon said end portion, so as to angularly move said end portion from said bent condition towards a substantially straight condition, in which said end portion is caused to be aligned with said proximal portion; - said oblong structure is a beam-shaped element which is continuously deformable along its entire extension and which tends to remain in and elastically return to a bent condition, in which said end portion is normally flexed relative to said proximal portion; and - said actuating apparatus comprises a pair of said pusher member (22, 22'), each of them being placed outside said oblong structure and being suited to stress said end portion in a flexing manner on a respective plane and to determine a respective degree of freedom of angular movement of said end portion on said plane; the two planes on which said end portion is configured to be stressed in a flexing manner are perpendicular to one another.