Triggering mechanism for a needle-free injector
First Claim
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 comprising a source of pressurized gas adapted to transmit a driving force to the drug delivery system, and a spring-driven hammer member adapted to engage the source of pressurized gas with the drug delivery system by urging the source of pressurized gas towards a pierce pin to release the pressurized gas;
a trigger assembly adapted to operatively couple the actuation system with the drug delivery system, the trigger assembly including a retaining member adapted to limit activation of the injection force assembly; and
a recoil restriction system adapted to limit movement of the injection force assembly and including a recoil member having a first end coupled to the hammer member and a second end adapted to engage with the retaining member.
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Accused Products
Abstract
Needle-free hypodermic jet injection devices having an actuation system to effect an injection from a drug delivery system. The actuation system includes an injection force assembly adapted to transmit a driving force to the drug delivery system. The actuation system further includes 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. In some embodiments, the device has 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. 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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Citations
13 Claims
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1. A needle-free injection device comprising:
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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 comprising a source of pressurized gas adapted to transmit a driving force to the drug delivery system, and a spring-driven hammer member adapted to engage the source of pressurized gas with the drug delivery system by urging the source of pressurized gas towards a pierce pin to release the pressurized gas; a trigger assembly adapted to operatively couple the actuation system with the drug delivery system, the trigger assembly including a retaining member adapted to limit activation of the injection force assembly; and a recoil restriction system adapted to limit movement of the injection force assembly and including a recoil member having a first end coupled to the hammer member and a second end adapted to engage with the retaining member. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A needle-free injection device comprising:
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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, wherein the trigger assembly includes selectively engageable first and second interior housings adapted to couple the actuation system with the drug delivery system, and a trigger sleeve adapted to limit relative movement between the first and second housings; and a body configured to house the drug delivery system and the actuation system, the body including; an outer housing configured to receive the drug delivery system, and a back cover configured to rotatably couple with the outer housing, wherein rotation of the back cover and the trigger sleeve is coupled and axial movement between the back cover and the outer housing is restricted. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification