Methods and devices for detecting positioning of a probe in a tissue of a patient. When the information display plate is in the first position, the display portion does not lie just under the window and a date in a position corresponding to the window is displayed through the window. Then, the half bearing undergoes plastic deformation so as to be fitted into the groove and both sides of the half bearing in the axial direction thereof come into abutment with the edges 22, 23 of the step-like portions and are deformed in a polygonal line form. To reduce the possibility of burning of the components of the fiber laser system with a multi-kilowatt combiner output, a coreless termination block is fused to the output end of the fiber combiner and configured so as to provide expansion of the combiner output without modifying the minimally possible M2 factor thereof. The trunk is raised by operating a tail lever.