Guedel Airway No.4 100mm Red

They are designed to allow free airflow, An orpharyngeal Airway (also known as OPA) or Oral Airway or Guedel Pattern Airway, It is a medical device called an airway adjunct used to maintain an open airway. It does this by preventing the tongue form covering the epiglottis, which could prevent the patient form breathing, When a person becomes unconscious, the muscles in their jaw relax and may allow the tongue to obstruct the windpipe or airway.