| 摘要 |
The invention relates to a protection device (2) for a syringe (1) comprising a needle (6), a tubular body (4) and an injection plunger (8). The inventive device comprises: a needle protector (22); a protector support (20); a spring (24) which presses against the support (20) and the protector (22), said support and protector being mobile in relation 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 means of unlocking the spring. When locked, the aforementioned spring (24) exhibits a pre-determined force which is greater than the push force necessary to move the plunger (8) of the syringe along essentially all of the injection stroke thereof. Moreover, the above-mentioned unlocking means comprise a digital support flange (50) which is solidly connected to the protector (22) and which is designed to (i) transmit a compression force to the spring (24), which is less than said pre-determined force, as the plunger slides along the injection stroke, and (ii) transmit a compression force to the spring, which is greater than said pre-determined force, when the plunger reaches the end of the injection stroke. |
