(b)(4).The customer returned one spring wire guide (swg) guide wire for evaluation.The catheter was not returned.The swg wire was unraveled and showed evidence of use.Visual examination revealed the swg is unraveled from the proximal weld and has multiple kinks in the guide wire body.The distal j-bend is undamaged.Microscopic examination of the swg confirmed the core wire was broken adjacent to the proximal weld and that the weld was present at the end of the coil wire.The exposed proximal core wire tip is rounded at the point of separation.Both welds appeared full and spherical.The broken core wire measured 600 mm in length, which met specification; therefore, no pieces of the core wire appear to be missing.The swg outer diameter was measured and was found to be within specification.A manual tug test confirmed that the distal weld was intact.A device history record (dhr) review was performed on the guide wire and the catheter and no relevant manufacturing issues were identified.The instructions-for-use provided with this kit describes suggested techniques to minimize the likelihood of guide wire damage during use.It states that if resistance is encountered when attempting to remove the guide wire after catheter placement, the guide wire may be kinked about the tip of the catheter within the vessel.In this case it is recommended to withdraw the catheter relative to the guide wire about 2-3 cm and then attempt to remove the guide wire.The instructions caution that withdrawing the guide wire against the needle bevel or use of excessive force during removal could damage or break the wire.The report that the guide wire was unraveled was confirmed through examination of the returned sample.The guide wire core wire was broken adjacent to the proximal weld.Dimensional inspection and a dhr review did not reveal any evidence of a manufacturing related issue.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 11070:1999 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 possibility of guide wire kinking.Guide wire breakage may occur if a force greater than the design specification is applied during removal.Based on these circumstances, it was determined that operational context likely contributed to this event, however, the probable cause of guide wire and catheter resistance could not be determined based upon the information provided and without the catheter being returned.Teleflex will continue to monitor and trend for reports of this nature.
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