| 摘要 |
Mouthpiece ( 1 ) having vestibular shield ( 21 ) overlapping a user's teeth and gums, gases passageway means extending through said vestibular shield allowing for the passage of said gases through mouthpiece and extra oral sealing ( 25 ) means associated with gases passageway, said passageway in use causes gases to be diffused (outlets 23, 24 ) when exiting from gases passageway. Mouth piece may have a noseflap to seal the user's nose or provide a passageway for use'r s nasal passages. Mouthpiece may have adjustment means to alter distance between said vestibular shield and said extra-oral sealing means.
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