(b)(4).Similar to device under 510(k) k090140.(b)(4).Summary of investigational findings: one image is received for investigation.The filter was returned.All filter legs are more or less deformed.It is not possible to draw any conclusion on why the filter is deformed.Based on the limited information, it is not possible to determine exact reason for filter expanding difficulties.However, the filter may have been somehow obstructed from fully expanding, either due to a clot turning into fibrin formation or due to other biochemical mechanism during the procedure.Also, if the filter is deployed in a small/flat vena cava, the filter would not fully expand until the vena cava is in a normal shape.Cook medical will continue to monitor for similar events.
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Description of event according to initial reporter: during the procedure, the filter cannot deployed as the steel wire of the filter was twist together.Doctor retrieved the filter, change another product to finish the procedure.Patient outcome: the patient did not require any additional procedures due to this occurrence.The patient did not experience any adverse effects due to this occurrence.
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