auto–injector

:  a device for injecting oneself with a single, preloaded dose of a drug that typically consists of a spring-loaded syringe activated when the device is pushed firmly against the body Some parents and health officials say epinephrine auto-injectors should be as common in schools as defibrillators are, so immediate help would be available to any student suffering anaphylaxis …—Noreen S. Ahmed-Ullah, The Chicago Tribune, 26 Jan. 2011