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 or continuous positive airway pressure machines are known to help with COPD even though they are traditionally used for sleep apnea. CPAP machines push in a steady stream of air into the lungs. Thus they help in better ventilation of lungs. At times a COPD patient is unable to exhale properly. Here giving a steady stream of air with CPAP does not help.