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Urinary catheters designed to be introduced into the upper urinary tract through a cystoscope; some catheters may also be introduced using a nephroscope. These catheters typically consist of a flexible 3 to 12 Fr radiopaque tube with several tip configurations that may include inflatable balloons. Ureteral catheters are used mostly for ureter dilation, bypass of partial obstructions, retrograde urography, brush biopsy, and stone retrieval.
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