| 摘要 |
A vocal valve to be applied to a tracheostomized person's neck comprises an air passage to be connected with the tracheostoma for connecting the trachea with the surroundings. A check valve member is provided in the air passage, wherein the check valve member is normally closed but allows for inhalation through the air passage. The vocal valve further comprises a manually adjustable member for establishing a free air flow through the air passage at inhalation as well as exhalation.
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