<unk> , also known as a grommet or myringotomy<unk> , is a small<unk>  inserted into the eardrum in order to keep the middle ear aerated for a prolonged period of time, and to prevent the accumulation of fluid in the middle ear. The operation to insert the<unk>  involves a myringotomy and is performed under local or general anesthesia. The<unk>  itself is made in a variety of designs. The most commonly used type is shaped like a grommet. When it is necessary to keep the middle ear ventilated for a very long period, a "T"-shaped<unk>  may be used, as these "T-tubes" can stay in place for 2–4 years. Materials used to construct the<unk>  are most often plastics such as silicone or Teflon. Stainless steel<unk> s exist, but are no longer in frequent use.
Tympanostomy tube
Tympanoplasty
Cragie tube
Mastoidectomy
Ethmoidectomy
Middle ear implant
Tympanocentesis
Iridodonesis