A closed intravascular catheter system comprising: a catheter hub, said catheter hub comprising: a tubular catheter attached to a catheter hub body at its proximal end; a catheter hub cavity in fluid communication with the lumen of the tubular catheter; a tube in fluid communication with the catheter hub cavity, said tube extending laterally from the catheter hub body; a septum, proximally of the catheter hub cavity; and an end cavity, proximally of the septum; a needle hub, said needle hub comprising: a needle extending distally from a needle hub body, said needle having a bulge at its distal end zone; a needle shield, said needle shield comprising: at least one resilient arm extending distally from a base plate, said base plate having a through hole for receiving the needle there through; wherein the needle hub body cooperates with the catheter hub body, such that the needle is slidingly arranged through said septum and in the lumen of said catheter, such that the needle may be withdrawn proximally from the catheter hub; wherein the needle shield is arranged in the end cavity in a retained manner through cooperation between the needle shield and an inner wall of the catheter hub in said end cavity, and onto the needle, such that the at least one arm rests upon and is spring loaded by the needle, and the needle is slidingly arranged within the through hole of the base plate, in an assembled state; wherein the bulge will interact with the base plate when the needle hub is withdrawn from the catheter hub to release the needle shield from the catheter hub and the at least one arm will cover the tip of the needle, in a released state; wherein the proximal end of the catheter hub body cooperates with the distal end of the needle hub body, without intermediary structures, in the assembled state; and wherein a distal connective flange of the needle hub body cooperates with the outer proximal surface of the catheter hub body in a retaining manner. a catheter hub, said catheter hub comprising: a tubular catheter attached to a catheter hub body at its proximal end; a catheter hub cavity in fluid communication with the lumen of the tubular catheter; a tube in fluid communication with the catheter hub cavity, said tube extending laterally from the catheter hub body; a septum, proximally of the catheter hub cavity; and an end cavity, proximally of the septum; a needle hub, said needle hub comprising: a needle extending distally from a needle hub body, said needle having a bulge at its distal end zone; a needle shield, said needle shield comprising: at least one resilient arm extending distally from a base plate, said base plate having a through hole for receiving the needle there through; wherein the needle hub body cooperates with the catheter hub body, such that the needle is slidingly arranged through said septum and in the lumen of said catheter, such that the needle may be withdrawn proximally from the catheter hub; wherein the needle shield is arranged in the end cavity in a retained manner through cooperation between the needle shield and an inner wall of the catheter hub in said end cavity, and onto the needle, such that the at least one arm rests upon and is spring loaded by the needle, and the needle is slidingly arranged within the through hole of the base plate, in an assembled state; wherein the bulge will interact with the base plate when the needle hub is withdrawn from the catheter hub to release the needle shield from the catheter hub and the at least one arm will cover the tip of the needle, in a released state; wherein the proximal end of the catheter hub body cooperates with the distal end of the needle hub body, without intermediary structures, in the assembled state; and wherein a distal connective flange of the needle hub body cooperates with the outer proximal surface of the catheter hub body in a retaining manner.