(b)(4).Similar to device under 510(k) (b)(4).(b)(4).Summary of investigational findings: the filter is undamaged and symmetric and distances between filter legs are 33.5mm, which is within the specifications (32-40mm).Attached imagings indicate that the tip of the sheath is uneven and that there are several marks in the tip of the sheath.The marks may have been caused by the anchors of the filter having been pulled back towards sheath tip.The blue sheath, the peek sheath and the introducer have been returned assembled, but the filter has been returned unloaded.The grasping hook can easily be advanced, but it has been straightened/pulled out of shape.The marks on the blue sheath caused by the anchors of the filter are so significant that it can be assumed that the filter was pulled back with such force that the grasping hook was straightened/pulled out of shape, too.The exact reason why the reported filter did not deploy cannot be determined.However, it is possible that filter did not release from introducer system, either because the blue button was not completely pushed, or maybe due to the fact that excessive back tension was applied to the system.It is known from the literature that excessive back tension could result in deployment difficulties/failure when pressing the release button.Cook medical will continue to monitor for similar events.
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