Method: a visual inspection, catheter tensile strength test, a microscopic inspection and photographic inspection was performed on the returned device.Results: a visual inspection found the silver-soaker catheter was returned not fully intact, the infusion segment of the catheter was missing.Inspected the catheter for signs of brittleness and none were found.The catheter was measured with a ruler and was approximately 44 inches long.The catheter was visibly stretched as it exits the luer connection.The catheter attenuation continued to approximately 14 inches where there was a visible kink.Attenuation was present on the catheter for the remaining length.The catheter was measured at approximately 33.5 inches and the diameter was 0.027 inches.The distal tip of the remaining catheter portion was measured and the diameter was 0.027 inches.The distal end of the catheter was examined under magnification and found signs of it being stretched.Tensile strength testing was performed on the silver soaker catheter and the tensile strength on the mid-body segment was 11.48 lbf which is within specification.The infusion segment was not received back and therefore testing on the infusion segment could not be performed.The passing rate for the test is >2.8(lbf) at the infusion segment and >4.00 (lbf) for the mid-body segment.Conclusion: the investigation summary concludes that the silver soaker catheter was broken shortly before the infusion segment mark.Attenuation was visible along the entire catheter.The end of the catheter at the break shows signs of stress when viewed under a microscope; thus, indicating it was pulled.Tensile strength was performed on the mid-body segment and it met specifications.A copy of the technical bulletin (tips for preventing in-situ catheter breakage with the on-q* pain relief system (mk 00021)) and a copy of the instructions for use (on-q* catheters and introducers (14-60-602-0-04) was provided to the customer along with a copy of their closure letter.Information from this incident has been included in our product complaint trend reporting systems for monitoring, tracking and trending purposes.
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