A safety catheter IV assembly (10； 100), comprising: a catheter assembly (12) that includes a catheter cone (14) and a catheter tube (16), the catheter cone (14) defining a cavity (38)； a needle assembly (18) that includes a needle cone (20) and a needle (22； 122), the needle (22； 122) having an enlarged diameter portion (32) and a needle tip (22a； 122a )； and a needle guard assembly (24), which includes a needle shield (26； 126) having a body portion (60； 160), which includes a proximal wall (62) defining a protective hole (64 ), and a first and second legs (60a, 60b； 160a, 160b) extending distally from the proximal wall (62) and defining a recess (80), having at least one of the legs (60a, 60b； 160a, 160b) a radial extension portion (84； 172), the first and second legs (60a, 60b, 160a, 160b) being able to move from an unprotected position, in which the needle (22； 122) is positioned between the first and second legs (60a, 60b, 160a, 160b), and a stored position, in which the radial extension portion (84； 172) is positioned distally with respect to the needle tip (22a； 122a ), to obstruct the distal movement of the needle (22； 122), including the needle guard assembly (24) plus a bushing (30), which defines a socket hole llo (30a) sized for sliding placement around the needle (22, 122) in a proximal location with respect to the enlarged diameter portion (32), being an internal diameter of the bore of the bushing (30a) smaller than the outer diameter of the enlarged diameter portion (32) of the needle, to prevent passage of the enlarged diameter portion (32) of the needle through the bore of the bushing (30a), where the outer diameter of the bushing ( 30) is larger than the internal diameter of the protection hole (64) to prevent needle removal (22； 122) through the protection hole (64), characterized in that the sleeve hole (30a) is aligned with the protection hole (64) to receive the needle (22； 122) in a sliding manner and where the recess ( 80) is configured to
