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Recently while examining a patient for stone in the bladder I wished to test the conductivity of the sounds by the phonendoscope placed over the suprapubic space while the searcher was being moved about in the bladder. The results were unsatisfactory, but the idea was suggested by the experiment of attaching the phonendoscope to the searcher.
A medium-sized screw was procured, the head and point of which being removed the shank fitted in the handle of a Thompson stone searcher, while the thread end caught snugly in the opening in the cardiac diaphragm of the phonendoscope. The connection being made, I repeated the examination and was rewarded by finding that the sounds were easily carried to the ear, intensified by the vibrations of the middle diaphragm of the phonendoscope.
I was so well pleased with this rough combination of the two instruments that I at once drew a design of
WILLIAMS HJ. A STONE PHONENDOSCOPE TUBE. JAMA. 1902;XXXIX(13):784–785. doi:10.1001/jama.1902.52480390040024
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