CONTROL SYSTEM AND PROCESS FOR APPLICATION OF ENERGY TO AIRWAY WALLS AND OTHER MEDIUMS

摘要

The present invention includes a system for delivering energy to an airway wall of a lung comprising an energy delivering apparatus and a PID controlle r having one or more variable gain factors which are rest after energy deliver has begun. The energy delivering apparatus may include a flexible elongated member and a distal expandable basket having at least one electrode for transferring energy to the airway wall and at least one temperature sensor f or measuring temperature. The PID controller determines a new power set point base on an error between a preset temperature and the measured temperature. The algorithm can be Pi+1 = Pi + G(.alpha.ei+.beta.ei-1+.gamma.ei-2) where .alpha., .beta. and .gamma. are preset values and .alpha. is from 1 to 2; .beta. is from -1 to -2; and .gamma. is from -0.5 to 0-5. In another variation, the controller is configured to shut down if various measured parameters are exceeded such as, for example, energy, impedance, temperature , temperature differences, activation time and combinations thereof. Methods f or treating a target medium using a PID algorithm are also provided.