It was reported that the patient underwent unspecified spinal procedure.During preparation of right screw hole, bleeding was observed while pulling out the drill.Blood pressure was dropped at once.Vertebral artery (va) damage was suspected because amount of bleeding reached 600ml.It was stopped by the astriction for 30 min and screw was inserted and the incision was closed.After the surgery, it was checked by angio-ct and the surgeon commented there was no problem in va.The surgical time was extended more than 60 min.No product problem was reported.Surgeon told that the cause was unknown.
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