An IV catheter system comprising: a catheter hub (100), said catheter hub comprising: a tubular catheter (101) attached to a catheter hub body (102) at its proximal end； a catheter hub cavity (103) in fluid communication with the lumen of the tubular catheter (101)； a tube (105) in fluid communication with the catheter hub cavity (103), said tube (105) extending laterally from the catheter hub body (102)； a septum (106), proximally of the catheter hub cavity (103)； and an end cavity (107), proximally of the septum (106)； a needle hub (200), said needle hub (200) comprising: a needle (201) extending distally from a needle hub body (202), said needle (201) having a bulge (204) at its distal end zone； a needle shield (300), said needle shield (300) comprising: at least one resilient arm (301) extending distally from a base plate (302), said base plate (302) having a through hole for receiving the needle (201) there through； wherein the needle hub (200) is arranged in the catheter hub (100), such that the needle (201) is slidingly arranged through said septum (106) and in the lumen of said catheter (101), such that the needle (201) may be withdrawn proximally from the catheter hub (100)； wherein the needle shield (300) is arranged in the end cavity (107) in a retained manner through cooperation between the needle shield (300) and an inner wall of the catheter hub (100) in said end cavity (107), and onto the needle (201), such that the at least one arm (301) rests upon and is spring loaded by the needle (201), and the needle (201) is slidingly arranged within the through hole of the base plate (302), in an assembled state； and wherein the bulge (204) will interact with the base plate (302) when the needle hub (200) is withdrawn from the catheter hub (100) to release the needle shield (300) from the catheter hub (100) and the at least one arm (301) will cover the tip of the needle (201), in a released state, is provided.La présente invention concerne un système de cathéte
