| 摘要 |
<p>A nostril blocker adapted for retained mounting upon the mouthpiece of breathing equipment and comprising a bifurcated resilient element that in use is disposed generally parallel with the mouthpiece gas passage and spaced therefrom by a distance such as to position limbs of the element to straddle the nasal septum and obturate the nostril openings of the user. <MATH></p> |
