Blank fields on this form indicate the information is unchanged, unknown or unavailable.Correction: event description: it was initially reported one device was found difficult to operate prior to patient contact and then the procedure was completed with a second device.The updated description accurately describes two devices that were found difficult to operate prior to patient contact and a third device used to complete the procedure.Investigation evaluation: a review of the complaint history, device history record, instructions for use (ifu), drawings, manufacturing instructions, quality control, and specifications of the device, as well as a visual inspection, dimensional verification, functional test, and supplier investigation, were conducted during the complaint investigation.Two unused devices were returned for investigation.A visual inspection revealed no damage to the devices.A functional test revealed that both devices exhibited difficulty in separating the stylet from the cannula.The failure could be recreated if the device was forcibly tightened.Both the outer diameter of the stylet and inner diameter of the cannula were measured to be within specifications.Additionally, a document based investigation evaluation was performed.A review of the device history record showed no non-conformances for the complaint device lot or related sub-assembly.It should be noted there were no other reported complaints for this lot.The instructions for use (ifu) advise the user to inspect the device prior to use to ensure that no damage has occurred.A component of the device related to the malfunction is supplied to cook by an external supplier.A supplier investigation was requested for this occurrence.The supplier investigated the lot records for the supplied subassembly components and found no non-conformances.The supplier concluded the failure mode did not seem to be associated with supplier processes.Based on the information provided, an examination of returned product, and the results of our investigation, the root cause was determined to most likely be manufacturing related.Specifically, the cause is traced to a quality control deficiency.There is no quality control step directly addressing this failure mode.The appropriate personnel have been notified.Appropriate measures are being conducted to address this failure mode.Per the quality engineering risk assessment no further action is required.Cook will continue to monitor for similar complaints.This report is required by the fda under 21 cfr part 803 and is based on unconfirmed information submitted by others.Neither the submission of this report nor any statement contained herein is intended to be an admission that any cook device is defective or malfunctioned, that a death or serious injury occurred, nor that any cook device caused, contributed to, or is likely to cause or contribute to a death or serious injury if a malfunction occurred.
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