(b)(4).Method: the device was reported to be returning for an evaluation and at this time is pending return.The lot number was not provided; therefore, the review of the device history record (dhr) cannot be performed at this time.Results: at this time the investigation is still in progress.Once the device is received, testing will be performed and results will be provided once completed.Conclusions: once the investigation and device analysis are completed a follow-up report will be submitted.Information from this incident has been included in our product complaint and mdr trend reporting systems.Trend information is used to identify the need for additional investigations.
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Method: a visual inspection, tensile strength test and microscopic inspection was performed on the returned device.Results: the silver-soaker catheter was returned not fully intact, missing the black catheter tip and infusion segment.The diameter where the breakage occurred was measured to be 0.029¿.The non-broken part was measured to be 0.043¿.The silver-soaker catheter was examined under a microscope magnified at 0.7x, no signs of brittleness were observed.Evidence revealed that stretching was observed where the breakage occurred.Tensile strength was performed on the silver-soaker catheter.The result for the catheter mid-body segment was 10.440(lbf).The tensile strength was not performed on the infusion segment because it was not returned.The passing rate for the test is >2.8(lbf) at the infusion segment and >4.00 (lbf) for the mid-body segment.The catheter met specifications during the tensile test and no additional testing was performed.Conclusion: evidence revealed that stretching was observed where the breakage occurred.Tensile strength testing was performed on the mid-body segment and it met specifications.It was reported that the catheter was pulled with more force, it then broke with partial catheter remaining inside the patient.Using excessive force >4.00(lbf) on the catheter at the mid-body segment and >2.8(lbf) at the infusion segment will cause it to break.Root cause was determined to be the incorrect use by the user.The instructions for use and the technical bulletin state to if catheter stretches to stop because continued pulling could break the catheter.The technical bulletin ( tips for preventing in-situ catheter breakage with the on-q* pain relief system, mk 00021) and instructions for use (on-q* catheters and introducers (14-60-602-0-04)) was sent to the customer with 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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