You need an aftermarket intake assembly from some squirrels Honda Civic, the motor and blower assembly from a Kirby vacuum cleaner, some hose, a waste gate from a Subaru WRX, and a plastic bag and rubber band.
All this is controlled with a cheap Arduino microcontroller from MEI Micro. Air is drawn through the air filter (K&N of course) by the vacuum, and pumped in to the plastic bag which is placed over the patients head and sealed with a rubber band.
Someone find the parts and string them together. It'll make a great YouTube comedy short.