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In the treatment of tight strictures it is frequently desirable to pass a metallic sound, catheter, or lithotomy staff attached to a flexible filiform guide rather than employ tunneled instruments or Bang's whalebone bougie.
The device now employed for attaching a filiform guide to any urethral instrument is the one used in Guyon's sound and in Maisonneuve's urethratome. A metallic tip threaded onto the end of the filiform is screwed into the end of the sound. This method of attachment is insecure and unsafe. Cases are on record in which filiforms have become detached in the bladder necessitating surgical operation.
To obviate this danger I had the tip of a sound cut off and bored through so that after a filiform has been passed through the tip it may again be screwed onto the end of the sound. Only the best imported filiforms with large heads should be employed and
ANTHONY HG. AN IMPROVED METHOD OF ATTACHING A METALLIC SOUND TO A FILIFORM BOUGIE. JAMA. 1901;XXXVII(19):1263. doi:10.1001/jama.1901.62470450034021a
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