Injection device providing automatic needle retraction

摘要: The present invention includes an automatic injection device that reliably provides needle retraction even when manufactured with part and assembly tolerances typical of low-cost high-volume manufacturing processes. injector the a body, syringe cartridge, drive mechanism, bias mechanism. mechanism energy source, member, compound plunger releasable coupling. Significantly, included in is designed to ensure occurs after has delivered desired dose medicament. Moreover, design can compensate for low-cost, high volume processes, enabling fabrication low cost providing reliable retraction.