A needle hub including a guide track ( 1.1.1 ) ( 1.1 ) , a needle connected to the needle hub ( 1.1 ) ( 1.2 ) , the needle hub ( 1.1 ) needle shield ( 1.3 ) and the safety needle device comprising a coupled to the fitting formula ( 1 ) is described . Guide track ( 1.1.1 ) includes a first axial section ( 1.1.3 ) , and a second axial section ( 1.1.5 ) , the locking section ( 1.1 . 9 ) I and a . Needle ( 1.2 ) has a distal tip ( 1.2.1 ) . Needle shield ( 1.3 ) comprises a radial projection adapted to engage the guide track ( 1.1.1 ) ( 1.3.1 ) . When the needle shield ( 1.3 ) is in the first axial position relative to the needle hub (1.1) (PA1) and the first angular position (P1), the radial projections ( 1.3.1 ) is in the first axial section ( 1.1.3 ) , the needle shield ( 1.3 ) covers the distal tip of the needle ( 1.2 ) ( 1.2.1 ) . When the needle shield ( 1.3 ) is in the second axial position (PA2) and a second angular position (P2), radial projections ( 1.3.1 ) and the second axial section ( 1 . 1.5 ) is located in the distal tip of the needle ( 1.2 ) ( 1.2.1 ) is exposed from the needle shield ( 1.3 ) . When the needle shield ( 1.3 ) is in the third axial position (PA3) and the third angular position (P3), radial projections ( 1.3.1 ) are locking section ( 1.1.9 ) is adjacent to , needle shield ( 1.3) covers the distal tip of the needle ( 1.2) ( 1.2.1 ) . Locking section ( 1.1.9 ) , the radial projections ( 1.3.1 ) engages the needle shield ( 1.3 ) is to move to the second axial position (PA2) and is adapted to prevent . The spring ( 1.5 ) is added to the biasing force and the biasing force of the rotation axis direction to the needle shield ( 1.3 ) to the needle hub ( 1.1 ) . Biasing force of the axial direction , urges the needle shield ( 1.3 ) towards the first axial position (PA1) and the third axial position (PA3), the biasing force of the direction of rotation , the needle shield ( 1.3 ) are biased toward the third angular position relative to the needle hu
