(b)(6).Complaint conclusion: the unit was examined under a microscope to determine whether the contrast media reached the vent hole prematurely, causing the balloon to burst.The vent hole was found to be intact, which indicated that the contrast media never reached it.A longitudinal tear in the balloon was observed, extending from the proximal seal to the distal tip fo the distal marker band.The length of the tear is approximately 14mm.Based on this evidence, the most probably root cause of the complaint is over-inflation of the balloon beyond the limits recommended in the instruction fo ruse (ifu) for this balloon size.The probable root cause of the complaint is over-inflation of the balloon beyond the limits recommended on the ifu for this particular balloon size.For optimum product performance, the balloon must be inflated in accordance with the directions in the ifu.An internal investigation was opened to address this issue.This mdr is being submitted as part of a retrospective review as the result of a recent fda audit and with accordance to the requirements of code of federal regulations - 21 cfr part 803, medical device reporting.
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