An IV catheter system comprising: a catheter hub, said catheter hub comprising: a tubular catheter, having a lumen, attached to a catheter hub body at its proximal end, with a catheter hub cavity (103, 107) in fluid communication with the lumen of the tubular catheter; a needle hub, said needle hub comprising: a needle extending distally from a needle hub body, said needle having a bulge and a high friction surface part at its distal end zone, wherein the high friction surface part is applied at least on the bulge and extends proximally and distally of the bulge along a section of the metal alloy of a needle shaft and has a surface roughness in a range of 0.25 to 10 R a; a needle shield made from a polymer with a low modulus of elasticity 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 is arranged in the catheter hub, such that the needle is slidingly arranged through the lumen of said catheter, such that the needle may be withdrawn proximally from the catheter hub; wherein the needle shield is arranged in the catheter hub cavity (103, 107) in a retained manner through cooperation between the needle shield and an inner wall of the catheter hub in said catheter hub cavity (103, 107), 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; and wherein the outer diameter of the needle bulge is larger than the inner diameter of the through hole of the base plate such that when the needle hub is withdrawn from the catheter hub, the contact between the needle bulge and the base plate provides force to release the needle shield from the catheter hub with the at least one resilient arm covering the tip of the needle in a released state. a catheter hub, said catheter hub comprising: a tubular catheter, having a lumen, attached to a catheter hub body at its proximal end, with a catheter hub cavity (103, 107) in fluid communication with the lumen of the tubular catheter; a needle hub, said needle hub comprising: a needle extending distally from a needle hub body, said needle having a bulge and a high friction surface part at its distal end zone, wherein the high friction surface part is applied at least on the bulge and extends proximally and distally of the bulge along a section of the metal alloy of a needle shaft and has a surface roughness in a range of 0.25 to 10 R a; a needle shield made from a polymer with a low modulus of elasticity 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 is arranged in the catheter hub, such that the needle is slidingly arranged through 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 catheter hub cavity (103, 107) in a retained manner through cooperation between the needle shield and an inner wall of the catheter hub in said catheter hub cavity (103, 107), 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; and wherein the outer diameter of the needle bulge is larger than the inner diameter of the through hole of the base plate such that when the needle hub is withdrawn from the catheter hub, the contact between the needle bulge and the base plate provides force to release the needle shield from the catheter hub with the at least one resilient arm covering the tip of the needle in a released state.