(b)(4).Similar to device under 510(k) k090140.Summary of investigational findings: the evaluation of the images indicate that one of the primary filter legs could be superimposed on one other primary filter leg.Furthermore, a tilt increases when a wire has been used to help open the filter.However, despite a significant tilt, the filter appears to have performed its function with a large amount of thrombus seen in the filter and below.The root cause for the filter did not open properly can not be determined, but the filter appearance is likely accounted for by the typical oval and fairly dynamic shape of the ivc.During the manufacturing qc processes the spring effect of filter is 100 % controlled, as they are all deployed after advancement through a sheath.Under normal conditions, ivc< 30 mm, the radial force of filter will make filter legs attach to ivc.Cook medical will continue to monitor for similar events.
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