Investigation ¿ evaluation: visual examination and functional testing of the returned products was performed.Additionally, a review of complaint history, the device history records, drawings, manufacturing instructions, quality control data and specifications was conducted.Two opened devices and eight unopened devices were returned for investigation.A functional test was performed.All the devices inflated without incident.Both of the open devices had asymmetrical balloons when inflated.Six of the eight unopened devices inflated asymmetrical when inflated.All of the balloons deflated; but firm pressure to the plunger was needed to deflate the balloons.There is no indication that a design or process related failure mode contributed to this event.A review of production and quality documentation did not identify any specific issues with current manufacturing or quality controls that may have contributed to this incident.Current controls for manufacturing are in place to assure functionality; device integrity prior to shipping.The device history record was reviewed and one non-conformance issue was identified that involved 9 items.The issue was related to the fitting damaged and these items were reworked.A review for additional complaints involving this device lot revealed this complaint is the only complaint that has been received associated with complaint device lot number 8139268.Based on the information provided, a definitive root cause could not be determined.Measures have been initiated to address this failure mode.Cook medical has notified the appropriate personnel and will continue to monitor this device via the complaints database for similar complaints.
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