Place body in sterile isolator, expose dura mater, DNase treatment of the area, insert sterile syringe into brain? Repeat experiment several times, and also pro

Place body in sterile isolator, expose dura mater, DNase treatment of the area, insert sterile syringe into brain? Repeat experiment several times, and also process negative controls. Not my area. I guess the fact that it hasn't been done proves it's way harder than I'm assuming it is.