As the device is in specification and did not show any deviation that could cause the reported incident we suspect, that maybe the pinning technique has been not optimal as described in the instruction manual: "adjust the skull clamp to the width of the patient's head in the manner that the two skull pins in the rocker arm are equidistant from the centerline of the head and the single skull pin at the extension assembly is in line with this centerline." based on previous reports, we suspect that the patient's advanced age and possible pre-existing conditions may have contributed to the reported incident.
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