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Triggering mechanism for needle-free injector

  • US 7,547,293 B2
  • Filed: 10/06/2006
  • Issued: 06/16/2009
  • Est. Priority Date: 10/06/2006
  • Status: Active Grant
First Claim
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1. A needle-free injection device comprising:

  • a drug delivery system including a nozzle having a drug chamber and an outlet orifice, the drug delivery system adapted to expel a volume of liquid from the drug chamber through the outlet orifice;

    an actuation system including;

    an injection force assembly adapted to transmit a driving force to the drug delivery system; and

    a trigger assembly adapted to alter the actuation system between a plurality of configurations including a fired configuration in which the injection force assembly transmits a driving force to the drug delivery system; and

    a recoil restriction system including a restriction member adapted to couple the recoil restriction system to the trigger assembly, and a recoil member coupled to the injection force assembly and movable relative to the restriction member, wherein the restriction member limits movement of the recoil member once the recoil member moves a predetermined distance relative to the restriction member.

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