(b)(4) new units were returned at the manufacturer for evaluation.All units were visually inspected.Two units were received with suction tubes detached from tip inserts.Suction tube pull test was performed to the other (b)(4) units three units were found below the 50 lbf parameter.Glue applied was not uniformly distributed through the connected parts.Based on device risk documentation and evaluation of units received from previous similar events, the most probable root causes for this condition can be associated, but not limited to: the tip might break/ fall-off if the assembly of the tip is improperly bonded (excess/less adhesive or solvent) producing weak or brittle bonding between parts.Incorrect assembly process (not enough insertion of suction tube) or too much force applied during assembly at the manufacturing process.Possible application of too much force during the tip assembly to the irrigation handpiece at the set-up stage in the operating room or during device usage.Poor gap design for mating parts (suction tube and tip insert).The device was scrapped at the manufacturer.
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