A device in the shape of a small sealed cylinder, containing pressurized Freon gas, intended to be inserted into a parent device where it is perforated so that its gas content can serve a specific function (e.g., a source of power or a refrigerant). The effect of the gas has a direct impact upon the functional use of the parent medical device (e.g., an antishock unit, a tourniquet unit, or a cryo-unit). The cartridge is discarded when it is empty of Freon gas.