(b)(4).The customer returned one guide wire assembly and one introducer needle for evaluation.The guide wire was returned partially advanced through the needle and was unraveled.Visual inspection revealed the guide wire was unraveled from the distal end.No obvious kinking was observed in the guide wire.Microscopic examination confirmed the damage, and revealed the core wire separation occurred adjacent to the distal weld.Both welds were present and appeared full and spherical.The broken core wire measured 599mm, totaling 353mm, which is within the specifications of 596-604mm per product drawing.The guide wire outer diameter measured 0.79mm which is within the specifications of 0.788-0.826mm per product drawing.Dimensional inspection of the needle could not be accurately performed as the unraveled portion of the guide wire was stuck inside the cannula and could not be removed.Functional inspection could not be performed since the unraveled portion of the guide wire was stuck inside the needle cannula and could not be removed.A manual tug test confirmed the proximal weld was intact.A device history record review was performed with no relevant findings.The instructions for use (ifu) provided with the kit warns the user , "warning: do not withdraw guidewire against needle bevel to reduce risk of possible severing or damaging of guidewire." the report that the guide wire unraveled was confirmed through examination of the returned sample.The core wire was broken adjacent to the distal weld and the components were returned with the guide wire partially advanced through the introducer needle.No manufacturing defects were found during this investigation.Arrow guide wires of this size are designed and manufactured to withstand a tensile force of 2.75 pounds force.This internal specification is higher than the bs en iso 11070:2014 standard of 2.2 pounds force for this size wire.The selected insertion site and patient anatomy may present a tortuous path that could contribute to the difficult advancing the guide wire.Based on these circumstances, unintentional use error caused or contributed to this event.Teleflex will continue to monitor and trend for reports of this nature.
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