The cerebral bypass surgery was performed on (b)(6) 2017, and the surgeon used the perforator in question to open the 6 burr holes.It was reported that the perforator¿s automatically disengagement mechanism did not work when the surgeon was opening the 6th burr holes.It caused dura mater injury and brain parenchymal damage (about 1 cm).After that, the surgery was completed without any further trouble.The patient¿s condition was stable under ct-scan postoperatively because there was no damage of blood vessel.The patient is (b)(6), male, and the thickness of skull is 5 mm.The surgeon commented that s/he felt some discomfort when opening the 5th burr hole although the perforator in question could be used properly so far.The surgeon also commented that s/he kept the rotation speed below 800 rpm when using perforator regularly.The drill system was aesculap product, (part number is unknown).No further information was provided by hospital.
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