Cauterising apparatus
AssigneeG2 Design Limited
InventorsNigel M. Goble, Colin C. O. Goble
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Abstract
Electrosurgical cauterizing apparatus has a radio frequency generator with a power oscillator which generates a bipolar cauterizing output signal for application to a pair of cauterizing electrodes. The oscillator carrier frequency varies according to the load resistance represented by tissue being cauterized and this variation is used to monitor the tissue resistance as cauterization progresses. The apparatus generates a cauterisation termination signal according to progress of the tissue resistance on a resistance versus time curve characteristic of the tissue cauterization process.
Claims19
Electrosurgical cauterising apparatus comprising a radio frequency generator having a pair of output terminals for the delivery of radio frequency power at an output carrier frequency to a bipolar electrosurgical cauterising tool, wherein the generator includes means for altering the output carrier frequency of the delivered radio frequency power according to an electrical resistance of tissue being cauterised by the tool during cautery, output carrier frequency monitoring means for sensing said tissue resistance, and control means operable to generate a cautery termination signal in response to the sensed tissue resistance having reached a predetermined end point value, the signal being generated for terminating the delivery of cauterising radio frequency power to the cauterising tool.
A method of operating electrosurgical cauterising apparatus having a radio frequency generator and a bipolar cauterising tool with cauterising electrodes coupled to the generator, comprising the steps of applying radio frequency power having an output carrier frequency to the electrodes, automatically altering the output carrier frequency of the applied radio frequency power according to an electrical resistance of tissue being cauterised between the electrodes during cautery, monitoring said output carrier frequency as a means of sensing said tissue resistance, generating a cautery termination signal in response to the sensed tissue resistance having reached a predetermined end point value, and ceasing application of radio frequency power.
Dependencies are inferred from the claim text.