| 摘要 |
The invention relates to an electrosurgical system (10) for the resection of body tissue, which has a large-area neutral electrode and an electrosurgical instrument (14), which are connected to a high-frequency high-voltage supply unit (18) on the one hand, and to a processing unit (22) on the other hand. In addition, the electrosurgical system (10) has a control unit for setting an operating state of the electrosurgical system (10). The electrosurgical instrument (14) has a first electrode (20), which has a small area in comparison with the large-area neutral electrode. The high-frequency high-voltage supply unit (18) is electrically connected both to the first electrode (20) and to the second electrode (16) and is designed to supply said electrodes with a predetermined alternating voltage. The processing unit (22) is likewise electrically connected to the first electrode (20) and the second electrode (16) and is designed to record an electrical response signal by means of the first electrode (20) and the second electrode (16) and to determine at least one dielectric property of a medium located between the first electrode (20) and the second electrode (16) at at least one frequency of the predetermined alternating voltage from the response signal. In addition, the processing unit (22) is designed to compare the at least one dielectric property with a predetermined reference value and to generate a control signal in accordance with the comparison of the at least one dielectric property with the reference value and to output said control signal. The reference value reflects a dielectric property of a selected body-compatible liquid (36). The processing unit (22) is connected to the control unit such that the control unit can receive the control signal generated by the processing unit (22) and can set an operating state of the electrosurgical system (10) in accordance with the control signal. |
