After the construction of a sigmoidoscope with proximal and distal illumination,1 continued research of the lighting systems resulted in the construction of a sufficiently powerful light bulb that provides excellent and bright illumination even if it is placed at the proximal end (near the examiner's eye) of the shaft of the scope. This improvement led to the construction of a simple endoscope that is useful for the nonproctologic examiner, such as the general practitioner or internist (parts 2 and 3 of the accompanying figure). Furthermore, additional refinements have been developed that make this endoscope very useful for the proctologist (part 10 of the figure).
The endoscope consists of a tubular shaft or sheath made of light noncorrosive metal (also available in plastic materials: bakelite® and lucite®) varying from 3 to 10 in. (7.5 to 25 cm.) in length and ⅝ to ⅞ in. (1.6 to 2 cm.) in diameter.
Turell R. AN IMPROVED SIGMOIDOSCOPE. JAMA. 1952;149(9):833–834. doi:10.1001/jama.1952.72930260008009d
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