| 摘要 |
987,712. Surgical optical instruments. AMERICAN CYSTOSCOPE MAKERS Inc. Oct. 10, 1962 [Oct. 18, 1961], No. 38315/62. Heading A5R. An oesophagoscope incorporating a flexible light and image conducting fibre bundle has a spherically shaped lens forming its distal tip, to facilitate introduction of the instrument. The flexible portion of the instrument comprises two bundles of light-conducting glass fibres, one arranged concentrically around the other. The outer group 27 conducts light from an external, high-intensity source and conveys it through a glass cylinder 43 to the area being viewed. The inner group 26 has an optically ground end face 29 on which an image of the area is focused by an objective lens assembly 48, the image being conveyed by the fibre bundle to the proximal end where it is observed through an adjustable eyepiece. The distal end of the instrument is closed by a spherically shaped lens 46 of approximately zero power. In a modified form of the instrument, the objective lens assembly 48 is made slidable within the tube 41 so as to be focused as necessary and the necessary movement is effected by a wire in a flexible sheath and actuated by a rack-and-pinion mechanism located adjacent the eyepiece. Specification 953,294 is referred to.
|
