(b)(4).Device evaluation: the needle was returned for evaluation.The tip of the needle broke at the suture notch.The needle was also buckled at the weld junction.The deformation from the buckling indicated that the needle was stuck, possibly at the tip, to prevent it from advancing forward.Excessive force from the trigger trying to push the needle forward caused the needle to buckle at the weld joint and broke at the tip as a result.It is possible that overstuffing the tissue between the jaws cause the tip of the suture needle to divert from its trajectory path to miss the trap door to hit the top jaw and stuck.It is also possible that the suture passer used in the case had the bottom jaw bent, which cause the tip of the needle to hit other feature of the top jaw and stuck.Since the suture passer used in the case was not returned for the investigation, the exact root cause cannot be determined.
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