Abstract: A medical injector apparatus includes a syringe having a barrel with a lateral projection, a needle, a plunger in the barrel having a portion extending from the barrel opposite the needle.

Abstract: A safety injector, primarily for self-administered medicaments, is adapted to hold a charged hypodermic syringe and its needle with the needle in a protected retracted position. When a trigger member of the injector is pressed against the skin of the patient, the needle is exposed for producing shallow penetration of the skin, then a plunger actuator is released for producing a forward movement of the syringe a limited distance to cause full penetration by the needle and a coordinated forward movement of the syringe plunger to force medicament from the syringe through the needle in a "tracked injection." A safety mechanism prevents release of the plunger actuator unless the syringe is fully seated within the injector.