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The following procedure refers to the replacement of a pigtail catheter where the tip is intended to be in the renal pelvis.
==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.]]
*Engage the obturator of the catheter, but loose enough so that you can remove it with one hand if needed.
*Position the patient on the side
Time usually allotted: 30 minutes.<ref>{{cite web|url=https://www.bsuh.nhs.uk/wp-content/uploads/sites/5/2016/09/change-of-nephrostomy.pdf|title=Change of
Nephrostomy|website=Brighton and Sussex University Hospitals}} Publication Date: February 2018.</ref>
===Removal of previous catheter===
