The device history records have been reviewed and this lot met all release criteria.There was nothing found to indicate there was a manufacturing related cause for this event.The device was not returned for evaluation.Medical records were provided and reviewed.Two inferior vena cava filters were deployed due to the large size of the inferior vena cava.Approximately, two months twenty-three days, a computed tomography (ct) abdomen and pelvis with intravenous contrast showed that the inferior vena cava filters were identified within the bilateral common iliac veins, at the level of the confluence of external and internal iliac veins on the right and above the level of the confluence of the left.There was no thrombus in the inferior vena cava or common iliac veins.Around, four months and eleven days later, an attempt was made to retrieve the right iliac vein filter from the patient¿s body.A left iliac venogram demonstrated that a large thrombus was associated with the superior tip of the left iliac vein filter, that extended towards the iliac bifurcation.Due to the adherent thrombus, it was not safe to remove the filter at this time.Through a separated right internal jugular venous access, a 6-french sheath was placed over the wire to the level of the right iliac vein inferior vena cava filter.A right external iliac venogram demonstrated there was no evidence of thrombus associated with the filter.Serial dilation was performed, and the coaxial sheath system was advanced into position just cephalad to the apex of the filter.Despite multiple attempts, the filter apex was unable to be engaged with a 20 mm loop snare.Ultimately, a 6 french sheath was placed over the wire to the level of the right inferior vena cava filter.A vs1 catheter was then formed in the right external iliac vein.It was then attempted to sling the filter with a glidewire.During this maneuver, the patient experienced discomfort and it was decided to abort the procedure.The sheaths were removed, and hemostasis was achieved with manual pressure.Therefore, the investigation is inconclusive as no objective evidence has been provided to confirm any alleged deficiency with the filter.Additionally, it can be confirmed that the patient experienced thrombus above the filter post deployment.The definitive root cause could not be determined based upon available information.Labeling review: the review of the instructions for use, indications, warnings, precautions, cautions, possible complications, and contraindications showed that the product labeling is adequate.(expiry date: 10/2021).
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