A radio frequency power amplifier module integrated with a power control loop is formed on a print circuit board and packaged within a mold. The surgery automatic suturing and knot tying apparatus comprises a positioning board, a threading module located on the positioning board, and two thread drawing modules and two needle threading arms located on the positioning board. The negative electrode contains a material including at least one of silicon Si and tin Sn as a constituent element. In use, the tab is either left flat to serve as a rigid stabilizing handle, or is bent along a series of pre-formed fold lines, and folded up and over the plate and contents, thus enabling the user to place their fingers under the plate body, and their thumb upon the tab to grip the plate and contents without direct contact and with increased control. The distal portion is capable of having an expanded configuration when inserted within the patient. The electron-emitting device has a substrate; a plurality of columnar first regions respectively orientated substantially perpendicular to the surface of the substrate; a second region provided between the respective first regions higher than the first regions in resistance; and an electron emission layer covering the columnar first regions and the second region.