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To whom it may concern: on (b)(6) 2018, we received a complaint regarding the use of a single optima coil (10mm x 27cm complex standard coil)."during embolisation, the coil "made" a node, and was unable to be retrieved, the coil detached spontaneously during retrieval of mc / coil system.A stent retriever was used to retrieve the coil.Another one was used." the results of our investigation following return of the affected device, are summarized as follows: the optima complex standard coil investigation revealed the delivery pusher with the implant coil not attached.The detachment section pet was intact.The sr thread that holds the implant coil attached to the pusher coil was found fractured distal to the attachment zone.The end of the sr thread has an appearance of being stretched.Without inspection of the implant, further investigation of the product issue is not possible.Based on the provided information and the investigations results the reported complaint was confirmed as the coil was detached from the pusher, it is possible that the implant coil was exposed to a force that exceeds tensile specifications however, without the implant coil the root cause cannot be determined.Review of the lot history records for the reported lots did not reveal any in-process or lot-specific issue that could account for the observation.No additional complaints against lot number 121417b have been made for the same issue.Comprehensive analysis of this failure mode has remained subject to monitoring for any unacceptable increase in trend.
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It was reported that: "during embolisation, the coil "made" a node, and was unable to be retrieved, the coil detached spontaneously during retrieval of mc / coil system.A stent retriever was used to retrieve the coil.Another one was used.".
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