Patent Document ID: 9867651
Application ID: 14297812
Patent Flag: 1

Claim One:
1. A system comprising: a generator including: an output stage configured to generate energy to treat tissue; a plurality of voltage and current sensors configured to sense voltage and current waveforms of the generated energy; and a controller coupled to the output stage to control the output stage; and an energy delivery device coupled to the generator, the energy delivery device configured to deliver the generated energy to the tissue, wherein the controller includes: a signal processor configured to: estimate a change in tissue impedance based on the sensed voltage and current waveforms; estimate a change in tissue temperature based on the change in tissue impedance; and estimate mass of the tissue and a thermal resistance scale factor between the tissue and the energy delivery device based on the change in tissue temperature and known parameters of the energy delivery device; and an output controller configured to generate a control signal to control the output stage based on the estimated mass and the estimated thermal resistance scale factor.