抄録
Three types of very thin fiber optical system for otolaryngologists were made and used to visualize inside of the Wharton's duct, the maxilla and ethmoid sinuses, and the bronchioles. The one of 0.75 mm diameter was possible to be inserted into the 18 gauge needle. The one of 1.2 mm had a flushing channel and a balloon at the tip. That of 2.0 mm also had a flushing channel and could be angulated 90 degrees. Although thequality of the picture and handling ability was not yet satisfactory, these endoscopes were found to be useful because of their small size and flexibility.
Further improvement of the quality of the picture and handling ability will make it possible to apply widly for daily practice.
