A needle assembly including a needle (15, 115) having a sharpened end and an opposing end and a needle tip shield (10, 110) for shielding the needle. The needle tip shield (10, 110) includes a needle shield (20, 120) connectable to a base (80, 180) and a needle hub (40, 140) fixedly connected to the opposing end of the needle (15, 115). The needle shield (20, 120) and needle hub (40, 140) are displaceable relative to each other from a first state, in which the sharpened end of the needle (15, 115) is exposed outside the needle shield (20, 120), to a second state, in which the sharpened end of the needle (15, 115) is shielded by the needle shield (20, 120). An actuation button (70, 170) is movably connected to the needle hub (40, 140) to maintain the needle shield (20, 120) and needle hub (40, 140) in a releasable locked state in a first button position relative to the needle hub (40, 140) and to permit the needle shield (20, 120) and needle hub (40, 140) to displace relative to each other in a second button position relative to the needle hub (40, 140).
