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 stands for Continuous Positive Airway Pressure, also referred to as noninvasive ventilation. CPAP is used by hospitals and emergency medical services to help patients breathe. According to EMS1.com, patients wear a special mask that sends air into the nose and down the windpipe. This stream of air creates positive pressure, holding the airway open. However, CPAP use is not advised in some emergencies.