(b)(4).The customer report of a cracked luer hub was confirmed by complaint investigation of the returned sample.The customer returned one, opened hemodialysis kit for analysis.The connector assembly will be analysed as part of this complaint investigation.Definite signs of use were observed on the returned sample.Visual analysis revealed a crack on the arterial luer hub, adjacent to and on the threads.Multiple scratches were also observed.Microscopic examination confirmed the damage and revealed that the crack is consistent with repeated over tightening on the luer hubs.The connector assembly was functionally tested per the instructions for use (ifu) provided with this kit, which instructs the user, "flush catheter thoroughly with sterile normal saline for injection to remove residual blood, post-treatment and before instilling heparin".The arterial and venous lines were flushed with a lab inventory syringe, and the arterial line flushed as intended.A leak was observed at the location of the crack in the arterial luer hub.No leaks were observed when flushing the venous extension line.A manual tug test confirmed both luer hubs were secure to their respective extension lines.The ifu provided with this kit warns the user, "repeated over tightening of bloodlines, syringes and caps will reduce connector life and could lead to potential connector failure." a device history record review was performed, and no relevant findings were identified.Based on the customer report and the condition of the sample received, unintentional use error caused or contributed to this event.Teleflex will continue to monitor and trend for complaints of this nature.
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