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In standard diagnostic illuminating instruments, such as the otoscope and the proctoscope, the lamp partially obstructs vision and surgical manipulation. I have therefore improved such an illuminating instrument, which permits by simple manipulation the change of the relative position of the lamp within the sight opening. That is, in a simple and practical way I can shift my lamp to a place where it will not interfere with my sight or impede my surgical manipulation and yet will give good illumination.
I do not employ a swivel arrangement of either the lamp or the stage of the instrument, such as is now in use in certain types. My arrangement is simpler and more stable and affords a greater play.
The stage of the head of the instrument consists of a collar (B) which holds in place a cam (A). The cam is rotatable within the collar in the direction of
PITMAN LK. NEW IMPROVEMENT FOR DIAGNOSTIC ILLUMINATING INSTRUMENTS. Arch Otolaryngol. 1937;25(3):308. doi:10.1001/archotol.1937.00650010346006
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