Investigation: the details provided were that the stent of the device would not deploy.The user indicated the device was being used for a vascular case (which is off-label use), also stated that the balloon did not get hung up on calcification, grafts or other stents while tracking to the intended target and the stent had cleared the introducer sheath prior to attempting deployment.The icast covered stent was returned for evaluation.The stent itself was found loose on the balloon and no longer crimped in position between the two gold radiopaque marker bands.The stent was observed to be partially off the balloon distally.The stent exhibited damage on the most distal portion of the stent.The proximal end of the stent had been flared partially.The stent was removed off the balloon.The balloon was found to still be in the folded position.The balloon did not show any signs that there had been positive pressure applied to the balloon.If there had been positive pressure applied the balloon cones of the device would have been open slightly and contrast fluid within the balloon cones.This was not observed.To ensure the balloon and stent delivery system was functional the catheter was prepped per the instructions for use and the balloon pressurized to 12atm as this is the rated burst pressure as indicated on the product label.The balloon opened fully and there were no leaks observed.The original description of the event was that the stent would not deploy.Although the stent was damaged, the undeployed stent was placed on a newly folded 7mm x 22mm catheter balloon.The stent was not crimped into position, however, when the catheter was pressurized to the nominal inflation pressure of 8atm as indicated on the product label, the stent opened without issue.Based on the initial investigation of the returned product the complaint cannot be confirmed.The stent was able to be deployed and the stent delivery system functioned properly and within specifications.The position of the stent on balloon as received was out of specification as it was not within the radiopaque markers and was not crimped.However, based on the condition of the returned device it is likely the stent was damaged while either being advanced to the intended target or while withdrawing back through the introducer sheath (or both).The introducer sheath type and size was not provided by the user.The device history records review did not identify any non-conformances.All product quality and performance requirements were met.A risk review found that the risk management documents for this product adequately address the reported defect and the severity and anticipated occurrence level are appropriate.
|