FRANCIS AMOAH,CHRISTOPHER PAUL HANCOCK,MARTIN JARMAN,NUWAN DHARMISIRI
申请号：
GB201308209
公开号：
GB2514100A
申请日:
2013.05.08
申请国别(地区):
GB
年份:
2014
代理人:
摘要：
A method of controlling radio frequency power delivered from a bipolar electrosurgical instrument (probe) into a biological tissue via an RF blade 6. The method comprises controlling the profile of a RF waveform by: setting a maximum voltage limit for a voltage applied across the probe； calculating a tissue resistance, the calculating step including a correction for an impedance associated with the RF channel； determining an objective tissue current limit from the calculated tissue resistance and a predetermined power dissipation target； and dynamically adjusting the current limit based on the determined objective tissue current limit. This control method may ameliorate the impact of an increased cable length on the accuracy of control of RF waveforms delivered to the probe tip. The cable 9 may have a length of 3 metres or more and the waveform may have a frequency in the range 100 kHz to 5 MHz. Also disclosed is an apparatus having a controller arranged to dynamically adjust the current limit of the RF signal generator based on the determined objective tissue current limit.
