The embodiments of the present tracheostomy valves include a flexiblediaphragm abutting a rib shaped substantiallyas a flat plate. Opposite the rib, the diaphragm abuts a boss and forms anuninterrupted seal therewith. As the tracheostomized patientinhales, the diaphragm bends about the rib, interrupting the seal and allowingair to flow smoothly into the valve. The features ofthe various embodiments contribute to a positive seal at all times exceptduring inhalation, and low resistance to airflow through thevalve during inhalation.
