This event was previously reported to the fda on a summary report and is now being submitted on a 3500a per fda request.Post market vigilance (pmv) led an evaluation of four endo gia* tri-staple rr 60mm m/t reload.The event report alleges the product was used in a surgical procedure.The visual inspection of the returned product noted the first three reloads were partially fired with the interlock engaged.The fourth reload was fully fired.The jaws were open.Staple pushers were visible at the 4 cm cut line indicating the point where the handle compression had stopped for the first three, and the front sutures were intact with pieces of the reinforcement material was left attached.Pmv performed functional testing which included the reloads were loaded into a post market vigilance instrument (0155) for functional testing.The interlock was overridden and the reloads were then applied to test media.All remaining staples were placed and test media was cleanly transected.The reloads¿ interlock was tested and found to function properly.Records from each manufacturing lot are thoroughly reviewed to ensure that products are released meeting all medtronic quality release specifications at the time of manufacture.Replication of the partial fire condition with interlock engagement may occur when the firing handle has not been completely cycled.If the instrument return knobs are retracted at any point once the firing cycle has begun, the loading unit will engage into safety interlock and prevent further attempts to fire by ceasing the placement of staples and tissue transection, and prevent patient harm.The root cause of the observed damage was misuse of the product which would have caused or contributed to the reported incident.The file will be closed as a misuse of the product.Should new information become available, the file will be re-opened and the investigation summary will be amended as appropriate.
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