Medical drilling and medical drilling

A medical drilling device for drilling of human or animal tissue includes a with a drill (7) in electrical contact Bohrelektrode (9) and a counter electrode (10). The two electrodes (9, 10) by a resistance measuring device (11) is applied such that the electrical resistance, preferably the impedance of between the drill (7) and the counter electrode (10) located fabric (2, 3, 4) measurable is. A display device (13), the operator receives information about the type of the drilled at the time the tissue and through the bore depth.