A plasma inverter is a technological device that, hooked up with a modified laser scanner, can produce a plasma shock.

In 2368, Geordi La Forge combined the two devices and, through a small hole created by means of a micro-optic drill, was able to send enough plasma through the hole to temporarily plasma-shock Deanna Troi and Miles O'Brien who were taken over by Ux-Mal criminals. (TNG: "Power Play")