| 摘要 |
In its broadest form, this invention enables the ventilation and drainage of the middle ear cleft via mastoid antral route, without disrupting the integrity of the eardrum. For this purpose, this tube is placed between mastoid antrum and the external ear canal after mastoidotomy (antrotomy). The tube has two cannulas, which are placed one within the other. One of these is the external cannula and it comprises a head portion made of a circular tab, a neck portion in a vertical plane to the head portion, the bent section making a right angle of 90 degrees and a longer shaft portion. Other cannula is the internal cannula and it comprises a thin, narrow and syringe-adapted-tipped canal and the canal used for the aspiration and drainage of the rest of the lumen. The external tip of the inner cannula proceeds from the external ear canal and ends pre-or retroauricularly. Through the syringe-adapted-tip of the inner cannula, serum or drugs may be administered.
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