Disclosed invention relates to an IV catheter device (100) with needle stick safety mechanism. Said device (100) includes a needle (1) having a first part (32), a second part (33) and a third part (4) having a diameter larger than the other parts of the needle (1). A catheter tube (3), which slidably encases the third part (4) and partially encases the first part (32) and the second part (33) of the needle (1), is in a fluid contact with a catheter hub (5).Needle cover assembly, (8) partially encases the first part (32) of the needle (1), is connected to the catheter hub by a lock (25) and jaws (26), comprises a casing (30) connected to the needle cover (24) via projections (23) and connected to the needle hub (2) by engaging flanges (17) and hooks (18) in slots (15) provided on the needle hub (2).
