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The nasopharyngoscope is an adaptation of the cystoscope. It differs from the parent instrument in size, and its lamp and lenses are in a fixed unit. In the majority of cystoscopes the lamp is fixed to the sheath and the sheath in turn slides over the lens portion of the instrument. My improvements are adaptable to all forms of illuminating observation telescopes used by members of the medical profession.
The nasopharyngoscope is a tubular telescope of small caliber (about 10.5 F). It is made up of two essential parts: (1) a series of lenses and a prism for the observation of the field of vision and (2) a lighting system to illuminate the field of vision.
The field of vision is the image seen through the eyepiece of the nasopharyngoscope. This is brought about by the series of lenses and the prism.
The field of illumination is the portion
PITMAN LK. TWO NEW FEATURES FOR THE NASOPHARYNGOSCOPE AND ALLIED INSTRUMENTS: Revision of the Lighting System and a New Type of Direction Finder. Arch Otolaryngol. 1935;21(6):719–721. doi:10.1001/archotol.1935.00640020734011
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