Abstract: The invention concerns an injection syringe (10) comprising a syringe body (12) bearing an injecting needle (22) and an actuating piston (14) movably mounted in the body (12). The injecting needle (22) extends axially inside the body (12) up to a rear end (22B) on one side of which is initially arranged in the body (12) a transverse wall (90, 96) capable of being perforated. Said transverse wall (90, 96) is movable relative to the needle from an initial position in which the transverse wall (90, 96) is at some distance from the needle (22) to a final position in which the transverse wall (90, 96) is pierced by said needle (22). The syringe comprises rigid means (64) for axially guiding the rear end (22) of the needle when the transverse wall (90, 96) is being pierced.

Abstract: The invention concerns an injection syringe (10) comprising a syringe body (12) bearing an injecting needle (22) and a rear actuating piston (14) movably mounted in the body (12). It further comprises a mobile protector (36) of the end (22A) of the injecting needle, movable between a retracted position in the body (12) and an active protecting position in which the front end or the protector (36) is in front of the injecting end (22A). The protector (36) and the syringe body (12) comprise protuberances associated (44, 102) by projections and recesses for maintaining the protector (36) in its active protecting position. The syringe comprises a member (66) for positively retaining in locked position the protuberances associated (44, 102) by projections and recesses when the needle protector (36) is in active protecting position.