High frequency surgery apparatus for cutting tissue - increases HF current until product of actual values of HF output voltage and current corresponds to adjusted power value

摘要

The high frequency surgery appts includes a voltage sensor (9) to monitor the actual value of the HF output voltage UHF (Uist). The actual value (Uist) is compared with the desired value (Usoll). A device (11) calculates, for a deviation of the actual value, (Uist) from the desired value (Usoll), a maximum value (Imax) for the UF current (IHF) at an adjusted maximum HF-power (Pmax) and actual value (Uist). The calculating device generates an electrical signal (K) to an electronic power supply (7) to supply a current (IHF) to the output of the HF generator. The UF current is increased until the product of the actual HF output voltage (Uist) and actual value of HF current (Iist) corresponds to the adjusted power (Pmax). For actual HF output voltage (Uist) to equal desired value (Usoll) is dependent only in the resistance between the active and neutral electrode. ADVANTAGE - Generates short duration and also higher HF current or HF power if necessary.