Injection arm

"Vader, keep that away from me!" "The injection arm is primed!"

- Darth Vader and Leia Organa

An an injection arm was a device employed by Imperial officials during interrogations.

Prior to an interrogation, it needed to be "primed;" it was also necessary for the subject to remain still in order to facilitate ease of use.

Darth Vader utilized an injection arm while debriefing Princess Leia Organa following her capture over Tatooine.