A device for delivering a pressurized material

A device for dispensing a pressurized material, the device comprising a first end wall a second end wall provided with an outlet port, and a body extending axially between the first end wall and the second end wall, the body defining a pressurizing chamber containing a gas generator fastened to the first end wall, and a tank for containing the material that is to be delivered and that is defined by the second end wall, the device further comprising a piston configured to move inside the body, the piston separating the pressurizing chamber from the tank, the gas generator being configured so that when the gas generator is triggered the gas generator causes the device to pass from a material-storage, first configuration to an end-of-material-dispensing, second configuration,

• wherein, in the first configuration, the piston is held in position in the body by an elastically deformable holder element extending axially, said holder element being secured to the first end wall and the piston being held stationary relative to the first end wall by a holding force provided by the holder element, the holder element exerting a clamping force that results from its contact with the piston and/or with a zone secured to the first end wall, the clamping force resulting from the elasticity of the holder element, and wherein
• the gas generator is configured so that when triggered the gas generator exerts a force on the piston that opposes the holding force so as to enable the piston to move by releasing the first end wall and thus causing the device to pass from the first configuration to the second configuration.