Manufacturing review: a lot history review was performed.This is the only complaint to date for this lot number.Therefore, a device history record review is not required.Investigation summary: the device was not returned for evaluation.Medical records were provided and reviewed.Approximately seven months of post deployment, venogram was performed which showed thrombus in the cava upto including the inferior vena cava filter extending slightly upto above the inferior vena cava filter but stopping before getting upto the renal veins.The next day, ekosonic endovascular system thrombolysis and thrombus aspiration from inferior vena cava filter was performed.Post ekos thrombolysis completion venogram was performed which showed the inferior vena cava was now widely patent except for some residual thrombus left in the inferior vena cava filter for a patient with caval iliofemoral thrombosis.Around five months later, inferior vena cava filter retrieval was performed.The retrieval capture device was advanced down over the filter and then with the usual maneuvers, the filter was retrieved into the sheath and pulled out of the patient.Completion venogram showed normal looking inferior vena cava.The patient tolerated the procedure without problems.Therefore, the investigation is inconclusive for retrieval difficulties.Additionally, it can be confirmed that the patient experienced thrombus above the level of filter post deployment.However, the relationship to the filter is unknown.Based upon the available information, the definitive root cause is unknown.Labeling review: a review of product labeling documents (e.G.Procedural instructions, indications, warnings, precautions, cautions, possible complications, contraindications, and unit label) showed that the product labeling is adequate.(expiry date: 03/2012).
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