<unk>  An<unk>  (EBV), is a small, one-way<unk> , which may be implanted in an airway feeding the lung or part of lung. The<unk>  allows air to be breathed out of the section of lung supplied, and prevents air from being breathed in. This leaves the rest of the lung to expand more normally and avoid air-trapping.<unk> s are typically implanted using a flexible delivery catheter advanced through a bronchoscope in minimally invasive bronchoscopic lung volume reduction procedures in the treatment of severe emphysema. The<unk> s are also removable if they are not working properly.
Endobronchial valve
Oropharyngeal airway
Heart valve
Lung cavity
Nasopharyngeal airway
Salve
Nasal cavity
Epigastrium