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The lot history records have been reviewed with special attention to the manufacturing and inspection of this product and the product was found to have met all specifications prior to shipment.No sample was returned.On the basis of the evaluation of the images taken on the date of stent implantation, the stent was placed properly and no indication for a significant elongation of the stent or reduction of the stent lumen could be identified.As no images of the date of event were provided, the reported stent fracture could not be confirmed.Potential contributing factors to the reported event have been evaluated.Previous investigations of similar complaints have been reviewed.A difficult vessel anatomy as well as a challenging stent placement site may be contributing factors to the reported event.Also an irregular stent placement may be a contributing factor to the reported stent fracture.An inadvertent movement of the hand or incorrect holding of the delivery system during stent release, an insufficient pre- or post-dilation as well as highly calcified vessels, the patient's condition or the vessel anatomy may contribute to an irregular stent placement.Based on the images provided, there was no irregular stent placement but the vessel was calcified.The stent was not placed in overlap with another stent.On the basis of the information available and the evaluation of the images, a definite root cause for the event reported could not be determined.The ifu states: "cases of fracture have been reported in clinical use of the lifestent vascular stent.Cases of stent fracture occurred in lesions that were moderate to severely calcified, proximal or distal to an area of stent overlap and in cases where stents experienced > 10 % elongation at deployment.Therefore, care should be taken when deploying the stent as manipulation of the delivery system may, in rare instances, lead to stent elongation and subsequent stent fracture.The long-term clinical implications of these stent fractures have not yet been established." furthermore, the ifu sufficiently describes the correct application of the device.In addition, the ifu indicates that pre-dilation of the lesion should be performed by using standard technique and that post stent expansion with a pta catheter is recommended.(b)(4).
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It was reported that the vascular stent was suspected to be fractured 12 months post implantation in the left middle sfa for treatment of a total occlusion.Reportedly, the severely calcified lesion had been pre-dilated with a 5 mm and a 6 mm balloon.For post-dilation, two drug-eluted balloons (6 mm) and a conventional balloon (7 mm) were used.There was a residual stenosis of 20 % post initial intervention.No additional treatment was required.There was no reported patient injury.
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