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Investigation ¿ evaluation: the investigation included a visual inspection of the returned device, a review of complaint history, the device history record, instructions for use, quality control data, and the device specifications.One outer carton and open inner pouch labeled rpn ush-626, label lot number 7352801 was received.Only the stent and positioner was returned.The tether was not returned.The proximal end of the stent was torn starting at the last side port continuing through the end of the coil.Based on the investigation evaluation, there is no indication that a design or process related failure mode contributed to this event.Current controls for manufacturing are in place to assure functionality and device integrity prior to shipping.A review of production and quality documentation did not identify any specific issues with current manufacturing or quality controls that may have contributed to this incident.A review of the device history record showed there were no non-conformances associated with the complaint device lot number.A review of complaint history revealed this is the only complaint that has been received associated with the complaint device lot number.The complaint was confirmed based on the physical evaluation of the returned product.Based on the provided information the definitive root cause is related to the product receiving excessive pressure.The stent was torn during removal of the tether suture.Per the quality engineering risk assessment, no further action is required.Cook medical has notified the appropriate personnel and will continue to monitor this device via the complaints database for similar complaints.
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