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It was reported that this was a coronary intervention procedure in the right coronary artery.A non-abbott 4.0x30 mm stent was implanted.The 4.5x20 mm nc trek was inserted to post-dilate the stent.The nc trek was inflated five times; first in the distal stent for 14 seconds at 12 atmospheres (atms), then in the more proximal segment for 31 seconds at 18 atms, again more proximal for 18 seconds at 16 atms, then for 25 seconds at 18 atms.The final inflation was at the ostium right inside the stent for 21 seconds at 20 atms.The nc trek was reported to be fully deflated before it was pulled into the guide catheter for removal, but the nc trek became stuck in the guide catheter.The guide catheter and nc trek were removed together along with the sheath.Outside the body, the nc trek was found to be scrunched up from the attempts to remove it from the guide catheter.The nc trek was also difficult to remove from the sheath and the nc trek separated in two pieces.Vessel access was lost, so a new sheath and new guide catheter were inserted.The procedure was completed with good final result.There were no adverse patient effects and no clinically significant delay in the procedure.There was no additional information provided.
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H6 medical device problem code 2017/above rated burst pressure.Visual inspection was performed on the returned device.The reported separation and failure to fold (bunched balloon) were confirmed.The reported difficulty removing the device from the guiding catheter/introducer sheath could not be replicated in a testing environment due to the condition of the returned device.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 of the reported lot did not indicate a lot specific quality issue.It was reported that the balloon was over inflated on the fifth time to 20 atmospheres (atm).It should be noted that the coronary dilatation catheters (cdc), nc trek rx, global, instructions for use (ifu) states: balloon pressure should not exceed the rated burst pressure (rbp).The rbp for the nc trek rx device is 18 atm; therefore, rbp was exceeded.In this case, it is unknown if the ifu violation caused or contributed to the reported complaint.The investigation was unable to determine a conclusive cause for the reported failure to fold (bunched balloon); however, the reported difficulty removing the device from the guiding catheter/introducer sheath and separation appear to be related to operational context.Return analysis confirmed that the balloon was bunched on the distal end of the balloon.In this case, it is possible that deflation technique and/or multiple inflations contributed to the reported balloon bunching; however, a conclusive cause cannot be determined.Additionally, it should be noted that the ifu states: with 4.5 mm and 5.0 mm balloon dilatation catheters, some increased resistance may be noted upon insertion or withdrawal into or out of the guiding catheter.In this case, it is possible that the combination of the larger profile of the 4.50 mm balloon and the bunching of the balloon contributed to the resistance met with the guiding catheter/introducer sheath, resulting in the reported difficulty removing the balloon dilatation catheter and the shaft ultimately separating.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.H6 medical device problem code 2889 was removed and code 1255 added.
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