A medical apparatus is provided with a housing； a mixer including a gas reservoir； a water unit for flowing water to the mixer； a gas unit for flowing gas to the gas reservoir； a gas output for flowing gas from the gas reservoir to the mixer so that gas is mixed with water to form a first mixture, a line for carrying the first mixture； a valve disposed downstream of the line； Venturi tubes disposed downstream of the valve； medication units for containing liquid medication, each medication unit being in fluid communication with the corresponding Venturi tube； a mixing device disposed downstream of the Venturi tubes to atomize the liquid medication and the first mixture to form a second mixture； a control panel electrically connected to the gas reservoir, the mixer, the valve, the medication units, and the mixing device respectively； and an outlet.
