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Investigation - evaluation.A review of complaint history, device history record, instructions for use (ifu), manufacturing instructions, and quality control data was conducted during the investigation.The complaint device was not returned therefore, no physical examinations could be performed; however, a document based investigation evaluation was performed.There is no evidence to suggest the product was not made to specifications.Review of device history record shows no nonconforming events which could contribute to this failure mode.There were no other reported complaints for this lot number.Each zenith device is shipped with instructions for use (ifu) t_zaaasz_rev3, listing the indications for use, contraindications, warnings and precautions, and the correct deployment procedure.Per the ifu" pre-existing regions of stenosis/ narrowing have been shown to increase the risk of a thromboembolic event.Patients with a graft leg lumen of less than approximately 5 mm id may be at increased risk of a thromboembolic event (e.G., graft limb occlusion).Inaccurate placement and/or incomplete sealing of the leg within the vessel may result in increased risk of endoleak, migration or inadvertent occlusion of the internal iliac arteries.The description of the event indicates that patient's left iliac was very tortuous and tortuosity, compression and pulsation can create shear forces within the leg that stimulate thrombus growth and/or cause occlusion.Based on the information provided and results of the investigation it is possible that the cause for occlusion may be related to the patient's preexisting condition.Per the quality engineering risk assessment no further action is required.Monitoring for similar complaints will continue.
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