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Investigation summary: the event unit was returned for evaluation.Upon visual inspection, engineering observed blood and eschar buildup on the jaws.During functional testing, engineering was able to replicate the sticking that occurred during the event by activating the device on porcine tissue.Engineering observed that, as eschar built up on the jaws and sealing surfaces of the device, tissue sticking increased.Upon further inspection, engineering found that the conductive stops, insulated components located at the distal and proximal ends of the static jaw, sunk during use of the device, leading to an insufficient gap between the jaws.This can result in increased tissue adherence.Upon further inspection, engineering tested the cutting performance of the device on porcine tissue and concluded that the device performed to specifications and successfully transected tissue on all activations.As such, engineering was unable to replicate "failure to cut" and determined that the blade functioned as intended.Engineering also compared the color of the sealing surfaces of the returned device to a known conforming device and confirmed a slight discoloration.The discoloration may be due to the environment it was used in, type of tissue it is used to seal on, or conductive fluids surrounding the jaws as it is used to seal.The discoloration is not indicative of device performance.The root cause of tissue adherence observed during the event is due to the movement of the conductive stop.Engineering was unable to determine a root cause for "failure to cut" as they were unable to replicate the incident.Applied medical recently implemented device enhancements intended to further minimize the potential for tissue sticking.
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