(b)(4).A device history report (dhr) was reviewed and no issues that could have contributed to the reported failure were noted.The device was manufactured according to release specifications.There was no complaint sample returned for investigation.However, a simulation test was conducted with representative samples from production on the same catheter size and balloon volume.Samples were inflated with 10ml distilled water and soak in water at 37 c for 7 days.Samples were removed from soaking after 7 days and check for any leakage.No deflation issue was observed; balloons were still inflated to its normal condition and shape.In our current standard operating procedure, the products are subjected to 100% visual inspection and any defective raw balloon will be culled out before sent to the next process.Upon completion of assembly process, the finished catheter will be again subjected to 100% balloon inspection and 20 minutes leak test.Catheter with defective balloon will be culled out during this process.In the absence of sample returned, further investigation could not be conducted and therefore; complaint is not confirmed.
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