Infusion kit includes: a butterfly needle having a stiff rod-shaped body, at least a pair of coplanar wings laterally and outwardly extending therefrom a cavity for receiving a slide, supporting a sliding needle from which an element projects and engages a straight groove along the body the element being longer than the cavity and projecting from the body, is insertable in a housing connected to the groove to compressibly block a spring between the slide and the cavity bottom wall an infusion cannula including a central and hollow cylinder, a flexible element, at least a coupling having an inner passage the flexible element and the passage communicating via the cavity to allow draining a fluid or the supply from the outside the flexible element is hollow and allows insertion of the needle of the butterfly needle through the cavity at least a pair of coplanar wings extend from the cylinder.
