A safety intravenous catheter assembly comprising: a needle assembly including a needle hub and a needle having a proximal end secured to the needle hub and a distal end defining a tip ; a catheter assembly including a catheter hub and a catheter tube extending distally from the catheter hub ; and a safety device including a housing defining a cavity, a distal opening and a proximal opening and a biasing member supported within the cavity, the distal and proximal openings being dimensioned to receive the needle , the biasing member including a stationary portion , a movable portion and a blocking arm , the movable portion being movable in relation to the stationary portion from a first position to a second position; wherein in an assembled state, the safety device is positioned between the needle hub and the catheter hub , the needle extends through the proximal and distal openings of the housing of the safety device and the catheter assembly, and the biasing member is compressed between the needle and the housing such that the movable portion is in the first position in engagement with the needle, and in a disassembled state, the tip of the needle is withdrawn through the distal opening into the cavity of the housing of the safety device and the movable portion (716c, 816c 916c) of the biasing member is in the second position spaced further outwardly of the stationary portion such that the housing is tilted in relation to the needle to move the needle out of alignment with the distal opening of the housing , characterised in that in the disassembled state, the blocking arm is positioned between the movable portion and the stationary portion to prevent movement of the movable portion from the second position back to the first position. a needle assembly including a needle hub and a needle having a proximal end secured to the needle hub and a distal end defining a tip ; a catheter assembly including a catheter hub and a catheter tube extending distally from the catheter hub ; and a safety device including a housing defining a cavity, a distal opening and a proximal opening and a biasing member supported within the cavity, the distal and proximal openings being dimensioned to receive the needle , the biasing member including a stationary portion , a movable portion and a blocking arm , the movable portion being movable in relation to the stationary portion from a first position to a second position; wherein in an assembled state, the safety device is positioned between the needle hub and the catheter hub , the needle extends through the proximal and distal openings of the housing of the safety device and the catheter assembly, and the biasing member is compressed between the needle and the housing such that the movable portion is in the first position in engagement with the needle, and in a disassembled state, the tip of the needle is withdrawn through the distal opening into the cavity of the housing of the safety device and the movable portion (716c, 816c 916c) of the biasing member is in the second position spaced further outwardly of the stationary portion such that the housing is tilted in relation to the needle to move the needle out of alignment with the distal opening of the housing , characterised in that in the disassembled state, the blocking arm is positioned between the movable portion and the stationary portion to prevent movement of the movable portion from the second position back to the first position. <EOS>