A pressurized fluid cartridge comprising: i) a bottom , a lateral wall and an upper wall opposite the bottom ; ii) a safety means that opposes the leak of fluid from the cartridge after perforation of a predetermined perforable part afforded in the upper wall ; said safety means comprising: *) a fluid dynamic seal means which in a fluid dynamic seal configuration contacts the upper wall along an imaginary closed line which surrounds said predetermined perforable part ; *) a flexible strip which pushes said seal means towards the upper wall , the strip being a single body to which the fluid dynamic seal means is assembled; said strip comprising: - a housing cup ; - at least a first and a second arm ; - an intermediate zone to the first and the second arm in which said cup is afforded and from which the first and the second arm extend towards the lateral wall , said cup being made of the same material and in a single body with the first and the second arm ; characterised in that the fluid dynamic seal means is at least partially housed in the housing cup ; the housing cup defining a concavity facing the upper wall . i) a bottom , a lateral wall and an upper wall opposite the bottom ; ii) a safety means that opposes the leak of fluid from the cartridge after perforation of a predetermined perforable part afforded in the upper wall ; said safety means comprising: *) a fluid dynamic seal means which in a fluid dynamic seal configuration contacts the upper wall along an imaginary closed line which surrounds said predetermined perforable part ; *) a flexible strip which pushes said seal means towards the upper wall , the strip being a single body to which the fluid dynamic seal means is assembled; said strip comprising: - a housing cup ; - at least a first and a second arm ; - an intermediate zone to the first and the second arm in which said cup is afforded and from which the first and the second arm extend towards the lateral wall , said cup being made of the same material and in a single body with the first and the second arm ; *) a fluid dynamic seal means which in a fluid dynamic seal configuration contacts the upper wall along an imaginary closed line which surrounds said predetermined perforable part ; *) a flexible strip which pushes said seal means towards the upper wall , the strip being a single body to which the fluid dynamic seal means is assembled; said strip comprising: - a housing cup ; - at least a first and a second arm ; - an intermediate zone to the first and the second arm in which said cup is afforded and from which the first and the second arm extend towards the lateral wall , said cup being made of the same material and in a single body with the first and the second arm ; - a housing cup ; - at least a first and a second arm ; - an intermediate zone to the first and the second arm in which said cup is afforded and from which the first and the second arm extend towards the lateral wall , said cup being made of the same material and in a single body with the first and the second arm ; characterised in that the fluid dynamic seal means is at least partially housed in the housing cup ; the housing cup defining a concavity facing the upper wall . <EOS>