Safety needle with deformable cannula for injector pen

A safety needle comprising an outer structure within which there is a cannula holder element capable of being movably coupled with an injector pen for a drug, said cannula holder element supporting and holding in a passing manner a cannula having a first extremity and a second extremity suitable for administration of the drug, a protective element having a body associated with a rigid structure having a body and being able to move internally within the rigid structure and axially along a longitudinal axis (W) of the safety needle against a spring so as to be able to expose the second extremity of the cannula for administration of the drug, said protective element being substantially cylindrical and hollow, provided with a hole for passage of the cannula and covering said second extremity of the cannula after administration, a deforming member capable of deforming the cannula after administration of the drug in such a way that the second extremity of such cannula remains within said protective element, said deforming member being associated with said protective element and being capable of rotating independently with respect thereto about an axis (Z) at right angles to said longitudinal axis (W) of the safety needle after administration of the drug, said deforming member having a projecting part capable of contacting the cannula during such rotation such as to deform the cannula towards the protective element and immobilize the cannula within the protective element, the deforming member comprising a body inserted into the cavity of said protective element, wherein the projecting part of said deforming member comes into contact with the cannula only after administration of the drug, said body of the deforming member having a portion which connects to discoidal lateral parts inserted into opposite holes made in the protective element and rotating within the said holes, the said discoidal lateral parts having ledges which project and are inserted within corresponding guide recesses made in the body of the rigid structure in which said protective element is inserted, said guide recesses autonomously and completely guiding movement of the protective element and rotation of the deforming member in said protective element.