The victim was bound upon this wheel, on his knees, with his hands behind his back.
A continuous positive airway pressure (CPAP) machine was initially used mainly by patients for the treatment of sleep apnea at home, but now is in widespread use across intensive care units as a form of ventilation.
Two of the most widely used and most effective are continuous positive airway pressure and dental appliances, or mouth guards. CPAP (Continuous Positive Airway Pressure) The most effective treatment for obstructive sleep apnea, CPAP blows air with continuous pressure down your throat at night to keep your airways open while you sleep.