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The speculum here described was constructed in the hope of securing an anal speculum which could be introduced into a hypersensitive anus without causing much pain. The object has been accomplished, for, from a considerable experience with its use, I have found that even an anus which is the seat of an irritable ulcer tolerates examination with this instrument in a most surprising manner.
It has also been found that the view of the mucosa is exceedingly satisfactory. The distention is equilateral and no distortion of parts is occasioned, as is the case when the parts are made to present at the end of a tubular speculum or when some form of dilating speculum is used. It is possible that this instrument may facilitate the discovery of the mouth of a fistulous opening. Hemorrhoids are seen as bluish spots, and a far more accurate conception is obtained as to their
ROBERTS D. A NEW ANAL SPECULUM. JAMA. 1910;LIV(2):124. doi:10.1001/jama.1910.92550280001001j
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