Pyrotechnic gas generator and corresponding childcare device

A pyrotechnic system comprising a gas generator for airbag(s) comprising

• at least one pyrotechnic charge and an ignitor configured to ignite said charge triggered during a predetermined condition,
• a reservoir containing a pressurised gas and having a mouth that is closed by a sealing member,
• a first duct communicating with the reservoir, and
• a second duct for evacuating gases from the first duct and that communicates with at least one airbag,
• the gas generator further comprising a striker located in the first duct and which can be displaced in a first step, when the predetermined condition is fulfilled, by the combustion gases generated by the pyrotechnic charge in the direction of the sealing member, from an initial position to an open position, so as to pierce the sealing member using means for piercing carried by said striker,
• said striker able to be returned, once the sealing member is pierced, by the pressurised gas stored in the reservoir, to the initial position, the pressurised gas escaping from the reservoir being directed into the first duct and toward and into the second duct for evacuating gases,
• wherein, in the initial position, the striker is located on one side of the second duct for evacuating gases, with the mouth of the reservoir being located on the other side of the second duct for evacuating gases in the duct, and in that the pyrotechnic charge is arranged at least partially in a housing included in said striker.