(b)(4).A device history record (dhr) review was performed and there were no issues found that could relate to the reported complaint.The sample was returned for evaluation.A visual exam was performed and no obvious defects were observed other than a stain found on the device.Both the clear and blue cuffs were inflated to 25 m bar with a calibrated endotest meter.It was observed that the pressure in the clear cuff dropped rapidly after inflation.No issues were detected with the blue cuff.The device was then immersed into water and air bubbles were observed coming from the clear cuff.No bubbles were seen coming from the blue cuff.The area of leakage was detected on the clear cuff and observed under magnification.A cut mark was found.The cut resembles that made by scissors.A 100% leak test is performed during the manufacturing process; therefore, a defect of this type would be detected prior to release from the manufacturing facility.It is most likely that the defect is due to improper handling by the end user during preparation, although this could not be confirmed.Other remarks: a conclusion code could not be chosen as the complaint of cuff leaking was confirmed; however, a root cause could not be established.
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