In a stepping motor cooling apparatus for a belt-type continuously variable transmission, a pair of primary and secondary pulleys are disposed inside a transmission case, and a forwardbackward switching unit is disposed coaxially to the primary pulley, furthermore, a stepping motor is disposed below the forwardbackward switching unit. The present invention comprises a phase-alignment system that is adjustable via a user interface to enable the clock phases to be adjusted. The tissue treatment electrode is cyclically movable relative to the distal end of the shaft.