(b)(4).Internal file number - (b)(4): during processing of this complaint, attempts were made to obtain complete event, patient and device information.Above rated burst pressure.The device was not returned for evaluation.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 should be noted coronary dilatation catheters nc trek rx, instruction for use (ifu) states: balloon pressure should not exceed the rated burst pressure (rbp).Also stated in the ifu: 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.The investigation was unable to determine a conclusive cause for the reported deflation issue and folded balloon (winged); however, the reported difficulty removing the device from the guiding catheter appears to be related to operational context due to the reported deflation issue.There is no indication of a product quality issue with respects to the design, manufacture, or labeling of the device.
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It was reported that the procedure was to treat a moderately tortuous and mildly calcified right coronary artery.A 4.5 x 20 mm nc trek balloon catheter was used and was inflated at 18 atmospheres (atms) during its first inflation, and above the rated burst pressure at 20 atms during its second inflation.The device did not meet any resistance during advancement.However, the balloon would not fold back up during removal.After multiple attempts to inflate and deflate the balloon, the device became stuck with an unspecified guiding catheter because the balloon was winged.It was noted that too much negative was pulled from the balloon.Therefore, the devices were removed as a single unit and the balloon was completely deflated upon removal to successfully complete the procedure.There was no clinically significant delay in the procedure and no adverse patient effects.No additional information was provided.
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