US Patent 9969346 Airbag restraint system

A restraint system includes a curtain airbag having an outboard layer and an inboard layer, an extension layer fixed to the inboard layer, and an inflator. The outboard and inboard layers define a first inflation chamber therebetween. The extension layer defines a second inflation chamber between the extension layer and the inboard layer. The inflator is in communication with the first and second inflation chambers. The first and second inflation chambers are fluidly isolated from each other.