Passy-Muir speaking valve.

@article{Kaut1996PassyMuirSV,
  title={Passy-Muir speaking valve.},
  author={K Kaut and J C Turcott and Martin Lavery},
  journal={Dimensions of critical care nursing : DCCN},
  year={1996},
  volume={15 6},
  pages={298-306}
}
The Passy Muir speaking valve is a device that facilitates communication and airway maintenance for patients who require artificial airways. The critical care nurse's role includes collaboration with speech and respiratory therapy in identifying, preparing, and monitoring the patient who uses the Passy Muir valve.