The invention relates to a high-frequency surgical device for monopolar coagulation of biological tissue using a high-frequency current. The device includes an electrosurgical instrument with a coagulation electrode and a surgical device with a high-frequency generator for generating a high-frequency voltage and for supplying the high-frequency current to the coagulation electrode of the electrosurgical instrument and at least one control device for terminating the coagulation process. A measuring device detects at least one measured value describing a measured tissue introduction of energy into a defined measured tissue area. An arithmetic device determines the measured tissue introduction of energy into the defined measured tissue area and a final value for a target tissue introduction of energy into a target tissue area. The control device regulates the high-frequency generator based on the final value by generating a shut-down signal when the target tissue introduction of energy reaches the final value.
