Needle-free injection system
First Claim
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1. A needle-free injection device, comprising:
- a syringe assembly configured to draw in and expel injectable fluid, the syringe assembly being configured to expel injectable fluid upon application of pressurized gas to the syringe assembly from a gas reservoir;
a slidable valve assembly configured to control buildup and release of pressure within the gas reservoir, the slidable valve assembly being progressively movable from a priming position to a charging position, and then to a firing position, where;
when in the priming position, the slidable valve assembly fluidly couples the gas reservoir to atmosphere, when moved from the priming position to the charging position, the slidable valve assembly fluidly couples the gas reservoir with a pressurized gas supply conduit, and when moved from the charging position to the firing position, the slidable valve assembly causes the gas reservoir to be fluidly coupled with the syringe assembly, enabling pressurized gas from the gas reservoir to act upon the syringe assembly.
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Abstract
A needle-free injection device. The injection device includes a user-grippable housing and a syringe assembly movably secured to the housing. The syringe assembly is configured to expel injectable fluid out of a nozzle upon application of pressurized gas to the syringe assembly. The injection device also includes a pressurized gas delivery mechanism disposed within the housing and configured to selectively apply pressurized gas to the syringe assembly. The pressurized gas delivery mechanism is at least partly actuated by pressing the nozzle onto an injection site so that the syringe assembly moves relative to the housing.
230 Citations
19 Claims
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1. A needle-free injection device, comprising:
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a syringe assembly configured to draw in and expel injectable fluid, the syringe assembly being configured to expel injectable fluid upon application of pressurized gas to the syringe assembly from a gas reservoir;
a slidable valve assembly configured to control buildup and release of pressure within the gas reservoir, the slidable valve assembly being progressively movable from a priming position to a charging position, and then to a firing position, where;
when in the priming position, the slidable valve assembly fluidly couples the gas reservoir to atmosphere, when moved from the priming position to the charging position, the slidable valve assembly fluidly couples the gas reservoir with a pressurized gas supply conduit, and when moved from the charging position to the firing position, the slidable valve assembly causes the gas reservoir to be fluidly coupled with the syringe assembly, enabling pressurized gas from the gas reservoir to act upon the syringe assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification