The positioning device comes standard with a clamp, consisting of a clamping rod, V-shaped clamp, clamping head, and clamping ring; Carving V-shaped grooves in the three directions of the clamping head is beneficial for guiding the clamping of the injection needle or electrode, with a clamping range of 0.3mm-1.5mm; The PEI material of the clamping head has electrical insulation properties, radiation resistance, high and low temperature resistance, wear resistance, and can transmit microwaves. PEI also has good flame retardancy, chemical resistance, and electrical insulation properties.