(b)(4).A device history record review was performed on the epidural catheter, stylet, and needle with no relevant findings.The customer reported the catheter was difficult to thread.The customer returned one epidural catheter with stylet and lidstock.No needle was returned.The returned catheter was visually examined with and without magnification.Visual examination of the returned catheter revealed the catheter appears used, but typical with no defects or anomalies observed.No kinks were observed on either the catheter or stylet.The outer diameter (od) of the returned catheter measured 1.06mm (caliper c05155) which is within the specification of a maximum of 1.115mm per graphic kz-19600-001; rev 1.An attempt to thread the returned epidural catheter was made.The distal end of the catheter would thread through a lab inventory 17ga needle with no resistance met.A drag test was performed per pip-013 using the returned catheter, a lab inventory other remarks: needle and weight (ga-wt-0035-008).The catheter passed the drag test with the lab inventory needle.A corrective action is not required at this time as the root cause could not be determined.The reported complaint of the catheter being difficult to thread could not be confirmed based on the sample received.The customer returned a catheter but no needle was returned.The returned epidural catheter could be thread through a 17ga lab inventory needle with no resistance met.The returned catheter passed a functional drag test, and the returned catheter od was found to be within specification.A device history record review was performed on the epidural catheter, stylet, and needle with no relevant findings.The catheter is an interactive part.Therefore, based upon the condition of the sample received and the information provided, the potential cause of this complaint could not be determined.
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