A non-return-valve, designed to ventilate polio patients with respiratory paralysis by manual positive pressure ventilation.
D006801:Humans; D007385:Intermittent Positive-Pressure Ventilation; D011051:Poliomyelitis; D011052:Poliomyelitis, Bulbar / Q000628:therapy*; D011175:Positive-Pressure Respiration; D012133:Respiratory Paralysis; D012122:Ventilators, Mechanical
POLIOMYELITIS, BULBAR/therapy; RESPIRATORS