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→Main steps: +Catheter
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==Main steps==
[[File:Pigtail catheter settings.jpg|thumb|300px|Various settings of a pigtail catheter with locking string, obturator (also called ''stiffening cannula'') and puncture needle. <br>'''A'''. Overview <br>'''B'''. Both puncture needle and obturator engaged. (not used in nephrostomy change)<br>'''C'''. Puncture needle retracted. Obturator engaged. In nephrostomy change, remove any puncture needle before the intervention<br>'''D'''. Both obturator and puncture needle retracted, when the catheter is in the renal pelvis. <br>'''E'''. Locking string is pulled (bottom center) and then wrapped and attach to the superficial end of the catheter.]]
<nowiki>*</nowiki> denotes the steps that should be done in fluoroscopy.
