| 摘要 |
A needle-protection device ( 2 ) for a syringe ( 1 ) having a needle ( 6 ), a tubular body ( 4 ) and an injection plunger ( 8 ). The device includes: a needle protector ( 22 ); a protector support ( 20 ); a spring ( 24 ) which presses against the support ( 20 ) and the protector ( 22 ), the support and protector being movable relative to one another between a retracted protector position, in which the needle of the syringe is exposed and the spring is locked in compression, and a deployed protector position in which the needle is disposed inside the protector and the spring is at least partially decompressed; and a mechanism for unlocking the spring. When locked, the spring ( 24 ) exhibits a predetermined force which is greater than the push force required to move the plunger ( 8 ) along essentially all of the injection stroke thereof. The mechanism has a digital support flange ( 50 ) which (i) transmits to the spring a compression force, which is less than the predetermined force, as the plunger slides along the injection stroke, and (ii) transmits to the spring a compression force, which is greater than the predetermined force, when the plunger reaches the end of the injection stroke.
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