Patent ID: 6676630
Filing Date: 2004-01-13
Classification: A61M

Abstract:
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.