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.
CPAP Machines. CPAP is an acronym for Continuous Positive Airway Pressure; a device that provides a fixed amount of pressurized air and is used for the treatment of obstructive sleep apnea, sleep disordered breathing and snoring.