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This is an olive-tipped bougie, the curved part of which is a steel spring, which allows it to straighten during passage through a straight cannula. The bladder should contain 150 c.c. or more of fluid. A trocar and cannula are inserted into it above the pubes in the usual way, and the trocar is replaced by the bougie without allowing the fluid to escape. If the full curve is not desired in searching for the urethra, the spring part should not be entirely passed through the cannula. After the entrance to the urethra is found, the flexibility of the spring will allow the tip to follow the urethra.
Stevens JL. AN INSTRUMENT TO AID RETROGRADE SOUNDING OF URETHRA. JAMA. 1917;LXVIII(12):911. doi:10.1001/jama.1917.04270030243015