| 摘要 |
A vocal valve for connection to a tracheostoma comprises a filter (16) for moisture and heat exchange at breathing through the vocal valve, and a housing (15) receiving the filter and having a first opening at one side of the filter to be connected to the tracheostoma, and at least one second opening at the opposite side of the filter, which communicates with the surroundings. A manually operated valve element (15') for blocking the air passage through the filter is constructed to close said first opening at manual operation thereof. |
