Patent ID: 8118787

Claim:
A safety device for a syringe having a syringe body ( 10 ), a plunger assembly ( 12 ; 112 ) and a needle ( 14 ), where the device includes a support sleeve ( 16 ; 116 ) suitable for retaining the body of the syringe ( 10 ) relative thereto, a protection sleeve ( 18 ; 118 ) and at least one retention tab ( 19 , 20 ; 119 , 120 ) rigidly connected to the protection sleeve and suitable for movement between a retained position in which this tab is retained relative to the support sleeve and a released position in which said tab stops being retained relative to the support sleeve to allow relative sliding of the protection sleeve and the support sleeve towards a protection position in which the needle ( 14 ) is surrounded by the protection sleeve ( 18 ; 118 ), where the plunger assembly has a cylindrical skirt ( 13 A; 113 A) suitable, at the end of the injection stroke of said plunger assembly, for engaging with an actuating part ( 19 B, 20 B; 119 B, 120 B) of the retaining tab for urging said tab towards the released position thereof, wherein a proximal end portion ( 16 A; 116 A) of a support sleeve ( 16 ; 116 ) has at least one deflection ramp ( 30 , 32 ; 130 ) suitable, at the end of the injection stroke, for engaging with said skirt ( 13 A; 113 A) for deforming the skirt to bring a portion of said skirt closer to the actuating part ( 19 B, 20 B; 119 B, 120 B) of the retention tab ( 19 , 20 ; 119 , 120 ) to enhance the engagement between the skirt and the actuating part.