(b)(4).Device evaluated by mfr.: returned product consisted of an apex balloon catheter.The balloon was loosely folded with blood in the lumen and contrast in the balloon.The balloon, markerbands, proximal bond and tip were microscopically inspected.The device was attached with an inflation device filled with water and brought to rated burst pressure (rbp).The balloon easily inflated and held pressure (without leaking) for 5 minutes.Microscopic examination of the device presented no irregularities or defects.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The root cause is not confirmed as there was no evidence of the alleged issue or any anomalies which could have contributed to the reported difficulty.(b)(4).
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