Patent ID: 7988675

Claim:
An automatic injection and retraction device having a longitudinal axis, comprising: an injection assembly having an activation-prevention feature moveable between an on position and an off position; a retraction assembly having a needle guard, said needle guard being removable from said retraction assembly in a direction along the longitudinal axis upon application of a removal force; and a pre-filled syringe cartridge having a hypodermic needle with a needle sheath thereon, said retraction assembly being secured to said injection assembly so that said pre-filled syringe cartridge is disposed in said retraction assembly with said needle sheath secured to said needle guard, wherein said injection and retraction assemblies are configured so that, upon application of a twisting torque to said injection and retraction assemblies about the longitudinal axis, said activation-prevention feature is configured to move from said on position to said off position simultaneous with applying said removal force to said needle guard.