(b)(4).The customer returned one hemodialysis catheter for analysis.Definite signs of use in the form of biological material were observed.Initial visual analysis revealed no obvious defects or anomalies.Based on the dhr finding identified, the catheter was cross sectioned and dimensionally inspected via a microscope.Microscopic analysis of the catheter extrusion diameter confirmed that it was not within the specification limits per the catheter drawing.The overall length of the catheter measured 150mm which is within the specification limits of 147mm - 167mm per the catheter product drawing.The catheter was then cross sectioned to analyze the outer diameter and the inner diameter widths.The outer diameter from two points were measured, and slight ovality was observed.The catheter outer diameters measured 4.699mm and 4.4958mm, of which 4.4958mm is not within the specification limits of 4.62mm - 4.72mm per the extrusion graphic.Additionally, the width of the first lumen measured 1.27mm which is not within the specification limits of 1.42mm - 1.52mm per the extrusion graphic.The width of the second lumen measured 1.8796mm which is within the specification limits of 1.86mm - 1.96mm per the extrusion graphic.The extension lines of the catheter were flushed using a lab inventory syringe, and both lumens flushed as intended.Performed per ifu statement "flush each lumen with sterile normal saline for injection to establish patency and prime lumen(s)." the extension lines were tested for liquid leakage per amrq-000162 rev.07 (bs en iso 10555-1 annex c) which states that no liquid leakage should form in one or more falling drops of water when tested at 300-320kpa for 30 seconds.Each extension line was separately attached to the leak tester, the distal tip of the catheter was occluded, and the leak tester was turned to 300 kpa for 30 seconds.No leaks were found anywhere on the catheter body or extension lines.A device history record review was performed, and a relevant finding was identified.A non-conformance was initiated for lot 72c22c0448 to address the issue of "incorrect lumen diameter".The ifu provided with this kit informs the user, "ensure catheter patency prior to use.Do not use syringes smaller than 10 ml to reduce risk of intraluminal leakage or catheter rupture.".The customer report of a blocked catheter could not be confirmed as part of this complaint investigation.However, dimensional inspection of the returned catheter revealed that the catheter did not pass all relevant dimensional requirements.The width of the inner lumen was found to out of spec which could have potentially contributed to the reported event that "the flow remained insufficient" in the catheter.Therefore, based on the customer report and sample received, manufacturing likely caused or contributed to this event.A non-conformance was initiated to further investigate this issue.Teleflex will continue to monitor and trend on reports of this nature.
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