(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Evaluation summary: the device was returned for analysis.The reported material deformation was able to be confirmed.Additionally, the stent implant was stationary on the balloon, but not between the markers.The reported failure to advance the device was unable to be replicated in a testing environment as it was based on operational circumstances.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history did not indicate a lot specific quality issue.The investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely that as the sds was advanced resistance was met with the mildly tortuous, heavily calcified and 80% stenosed anatomy resulting in the reported failure to advance.As the device was withdrawn interaction with the anatomy and/or other devices resulted in the reported flared stent struts thus resulting in the noted stent mislocation.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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It was reported the procedure was to treat mildly tortuous, heavily calcified, 80% stenosed de novo lesion in the proximal left anterior descending (lad) coronary artery.A 2.5x20 mm trek balloon dilatation catheter (bdc) was used to pre-dilate the lesion.The 3.0x23 mm xience xpedition stent delivery system (sds) was advanced in the patient anatomy; however, the sds got stuck in the middle of the lesion, failed to cross.The sds was removed without issue and it was noted that the proximal stent struts were flared.There were no adverse patient effects and no clinically significant delay during the procedure.The patient was sent to surgery because no other device crossed the target lesion.No additional information was provided.Return device analysis revealed that the stent had moved distally and was mislocated on the balloon.
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