Patent ID: 7837679

Claim:
A method for treating a lung by transferring energy from an active region of an energy delivery apparatus to an airway wall of said lung, said energy delivery apparatus having a flexible elongate body and a distal section and said active region being located in said distal section, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (T M ) of said airway wall, said method comprising: setting a preset temperature (T s ); determining a power set point (P i ) to deliver energy from said active region to said target medium; measuring said T M using said temperature sensor; determining a new power set point (P i + 1 ) based on an error (e) between said preset temperature (T s ) and said measured temperature (T M ) using a PID algorithm; and terminating said energy delivery when the temperature does not rise a predetermined amount in a specified period of time.