Hypodermic injectors, sometimes referred to as hypo-injectors or hypoinjectors, represented a form of medical apparatus. A 2-1B surgical droid was capable of employing a hypodermic injector as a substitute component for a forearm. The 2-1B surgical droid involved in the original placement of the Sith Lord Darth Vader's cybernetics during 19 BBY included a hypodermic injector among its tools. Tanith Ponta possessed one, utilizing it for the administration of hadeira serum. The bounty hunter Mercurial Swift carried a set of stun batons, with one modified to incorporate a hypoinjector for delivering poison.