Abstract: A pen-shaped device has a trigger mechanism placed within a trigger housing, the trigger mechanism being used to puncture an adjacent gas containing ampoule housed in an ampoule receptacle. The trigger mechanism is actuated by a cap, which is connected to a stop (the latter connected to a plunger) of the trigger mechanism. A prong is provided at the bottom of the plunger, enabling the trigger mechanism to puncture the gas containing ampoule. A spring is connected to the trigger housing and provides resistance against actuation, ensuring the gas containing ampoule is not accidently punctured. In order replace expended gas containing ampoule, the ampoule receptacle can be unscrewed from the trigger housing. The expended ampoule can be removed and a new ampoule installed. A clip is connected to the cap, allowing the present invention to be securely carried, primarily by being attached to a pocket.