In accordance with various embodiments, a surgical generator for providing a drive signal to a surgical device may comprise a first transformer and a second transformer. The system includes a catheter which is positionable in a blood vessel at the interventional procedure site. Further, the lift table may be easily disassembled and assembled to allow efficient transporting. In yet another arrangement, a spring is arranged to bear against a current-carrying conductor to adjustably vary the force by which the lower ends of the fibers are urged to move toward the rotor. Other relationships that are changed as a result of the command to restructure are also determined and are automatically preserved subsequent to the generation of the new hierarchical relationship. Accordingly, if a malfunction of a component part occurs during manufacturing processes, less number of component parts are rejected as failure.