Auxiliary magnifying lens for sigmoidoscope.

Abstract

Since sigmoidoscopic examinations are becoming more widely used, a simple device is presented that facilitates the taking of biopsy specimens from lesions of the rectum and lower sigmoid and is equally useful in attacking benign and premalignant lesions under direct vision. The auxiliary lens, attached on a pivot on any sigmoidoscope, allows ample room for biopsy or fulguration under the same magnification as the larger lens (see figure). When the proximal end of the sigmoidoscope is open it is easier to advance the sigmoidoscope under atmospheric pressure. This auxiliary magnifying lens, unlike telescopic devices, does not need any adjustments. It is simple, inexpensive, and always ready. The distance and focal point in a sigmoidoscopic examination are constant. Thus the same magnification is assured whether the sigmoidoscope is closed or open. 702 Summit (22).