A needle assembly, comprising: a housing comprising a wall having an inner wall surface (180) defining a cavity having a pointed protector (100) disposed therein； a needle (170) having a trunk, a needle tip (172) and a non-uniform section (175)； the needle (170) passes through the housing and the tip guard (100)； the tip protector (100) comprises a first protector body (102) comprising a proximal wall (132) with an opening (158) and further comprising an arm (140), which extends distally from the proximal wall (132) ； said arm (140) further comprises a distal wall (150) to block the needle tip (172)； a second protector body (104) defining a cavity to house the first protector body (102), wherein the second protector body (104) comprises a first and a second edge (116) and a deflector plate (112) which is configured to deflect and move with respect to the first and the second torch (116), the deflector plate (112) comprises a projection (120) that projects in the cavity (155)； where the non-uniform section (175) in the needle (170) it is configured to engage the opening (158) in the proximal wall (132) in a used position； and wherein the non-uniform section (175) is a corrugation, an accumulation of material, a curve or combinations thereof.Un conjunto de aguja, que comprende: una carcasa que comprende una pared que tiene una superficie interior (180) de pared que define una cavidad quetiene un protector (100) de punta dispuesto en la misma； una aguja (170) que tiene un tronco, una punta (172) de aguja y una sección no uniforme (175)； la aguja (170) pasaa través de la carcasa y del protector (100) de punta； el protector (100) de punta comprende un primer cuerpo (102) de protector que comprende una pared proximal (132) con una abertura (158) y quecomprende además un brazo (140), que se extiende distalmente de la pared proximal (132)； dicho brazo (140)comprende además una pared distal (150) para bloquear la punta (172) de aguja； un segundo cuerpo (104) de protector que
