Abstract: An insufflation nozzle, which has a plane of symmetry, includes a sleeve having an inlet which is symmetrical about an axis and an outlet orifice. A deflector is disposed to face the outlet orifice and extends transversely with respect to the axis. A link is provided between the deflector and the sleeve to permit movement of these components relative to one another. The link includes a screen disposed symmetrically with respect to the plane of symmetry. A surface of the deflector which is directed toward the sleeve has planar portions which are inclined relative to the axis and have a spacing, relative to the outlet orifice of the sleeve, which increases along a direction extending away from the screen.