| 摘要 |
The invention relates to a method and to a device for controlling a treatment process, said device comprising a treatment tool, in particular an HF surgical instrument, an energy source for inputting electrical power into a material to be treated, and a control apparatus for controlling the energy source. The control apparatus is designed to control the energy source in such a way that the power fed into the material to be treated is controlled having a ramp-shaped, preferably linear course in a first treatment phase. An impedance-sensing apparatus determines the impedance progression and/or the present impedance of the material to be treated and detects the attainment of an impedance minimum. A timer is started when an impedance minimum is detected and is reset when a further impedance minimum is detected within the certain time interval, whereupon the timer beings to run anew. If a new impedance minimum is not detected within the certain time interval and the time interval expires, the control apparatus switches the power control over to constant power or a power progression having a changed gradient. If a certain criterion is met, a switch-over is made from power control to voltage control. |
