Method and system are provided for providing constraint-based guidance to a designer to support the application of useful constraint-based heuristics in complex collaborative design, thus reducing late conflicts and facilitating their resolution when they happen. The closed air system fluidly coupled to a DC power air compressor for receiving pressurized air. The correction may be effected by adding to a logarithmic estimation a logarithmic correction factor. The shell may be in fluid communication with a blower. Energy is applied by an electrode catheter in apposition with the vein wall to create a heating effect. The degradation in conditioning performance of a conditioning device is accounted for by controlling at least one of the conditioning velocity, conditioning down force and conditioning time.