(b)(4).The device was not returned for analysis.The lot history record (lhr) for this product could not be reviewed because the product was not returned for evaluation and the part and lot numbers were not reported.It should be noted that the instructions for use (ifu), absolute pro vascular self-expanding stent system ifu states: ¿should unusual resistance be felt at any time, including resistance unlocking the handle or rotating the thumbwheel, during stent deployment, the entire system should be removed together with the introducer sheath or guiding catheter as a single unit.Failure to follow these instructions could result in failure to deploy, difficulties with deployment, partial stent deployment or deployment in an unintended location.¿ in this case, it does not appear that the use of extra force to rotate the thumbwheel and deploy the stent contributed to the difficulty, as the stent was ultimately deployed.In addition, with the stent already partially deployed, the stent system would not be able to be removed together with the introducer sheath or guiding catheter as a single unit without causing damage to the stent.Based on the case information, a conclusive cause for the reported activation difficulty and resistance could not be determined.In this case, it is possible the anatomical conditions created enough friction to reduce activation, however this could not be confirmed because the device was not returned for analysis.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
|