The pneumatic otoscope includes a speculum which has an elongated preferably generally cylindrical body with a rear end to which a vewing lens is fixed to seal that end. The opposite front end of the speculum is open. The sidewall of the speculum body is closed and defines a generally central space extending...http://www.google.fr/patents/US5873819?utm_source=gb-gplus-shareBrevet US5873819 - Pneumatic otoscope
