An airbag device including an airbag that provides more effective protection of an occupant. A modulator is configured to direct the pulsed light beam onto a device via a plurality of light patterns such that a plurality of electrical signals are generated by the device. The device further comprises air inlet means by which air may be drawn into the chamber and means by which air and entrained medicament may be drawn out of the chamber. A deformable stiffening element is positioned on the elongated tube portion, and is constructed of a material that allows it to be repeatedly and forcibly deformed whilst substantially retaining such deformed configuration after the removal of a deforming force. An internal hook is provided in the housing to grasp the needle of the syringe, when the housing is pivoted to cover the needle extending from the needle hub of the syringe.