Multiple realities
(covers information from several alternate timelines)
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The deuterium injector, or simply matter injector, was a component of the deuterium injection subsystem. This subsystem was part of a starship's warp propulsion system. Injectors were located under the deuterium tank. The injectors precisely compressed and streamed matter (deuterium) through the deuterium stream coils into the dilithium regulation chamber. (TNG: "Contagion", "Booby Trap", okudagrams)

As payment, the automated repair station requested either three warp coils, five deuterium injectors, or two hundred liters of warp plasma from Enterprise. (ENT: "Dead Stop")

When the Takret Militia took over control of Enterprise NX-01 in 2152 the matter injectors and antimatter injectors went online and had to be shut down manually from junction 42-A. (ENT: "The Catwalk")

In 2372 in the mirror universe, Benjamin Sisko took the ISS Defiant's deuterium injector offline and online again. It required the flow regulators to be shut off. (DS9: "Shattered Mirror")

The Red Squad cadets often had trouble with the USS Valiant's deuterium injector start-up routine, as the system often experienced power spikes. When he came aboard, Nog suggested doing what Chief O'Brien had done on the USS Defiant, by recalibrating the lateral impulse control system. (DS9: "Valiant")

In 2377, Captain Kathryn Janeway proposed to trade zeolitic ore to the Annari in exchange for deuterium injectors. The deal fell through after the Annari found USS Voyager crewmembers had been helping their enemies, the Kraylor. (VOY: "Nightingale")

Later that year, The Doctor, functioning as the ECH, repaired Voyager's deuterium injectors among other systems that had been damaged by a subspace mine. (VOY: "Workforce")