An apparatus for treating body tissue includes a treatment instrument 1 for treating the body tissue and a measuring unit 3 for measuring the actual value of a parameter of the body tissue at at least one measuring point. An identifier 4 is connected to the measuring unit 3 for identifying the body tissue to be treated on the basis of the actual value and for outputting a coordinate signal containing the coordinates of the body tissue to be treated. A positioning device 2 receives the coordinate signal and moves the treatment instrument 1 to the body tissue to be treated. An updating device 8 is connected to the measuring unit 3 and the identifier 4 and outputs an updating signal for triggering renewed measurement of the actual value and renewed identification of body tissue to be treated.
