초록 ▼

A system is provided that is useful for hypodermic injection of medication without piercing the skin with a needle. The system includes a gas pressure actuated needleless hypodermic injection device for injecting medication through the skin. The injection device includes an injector assembly having

A system is provided that is useful for hypodermic injection of medication without piercing the skin with a needle. The system includes a gas pressure actuated needleless hypodermic injection device for injecting medication through the skin. The injection device includes an injector assembly having an injector body with a chamber for a compressed gas container and an ampule assembly mounted on the injector body for containing the liquid medication. The system also includes an adaptor assembly for use on a medication vial for transferring medication to the ampule assembly.

대표청구항 ▼

A gas-pressure-actuated needleless hypodermic device for injecting liquid medication through the skin of persons or animals, the device comprising: (a) an ampule assembly comprising: (i) a body having a cavity for holding liquid medication between first and second ends of the body; (ii) an orifice i

A gas-pressure-actuated needleless hypodermic device for injecting liquid medication through the skin of persons or animals, the device comprising: (a) an ampule assembly comprising: (i) a body having a cavity for holding liquid medication between first and second ends of the body; (ii) an orifice in the first end of the body through which such liquid medication can flow into and out from the cavity; and (iii) a plunger assembly movable within the cavity for drawing the liquid medication into the cavity and for forcing the liquid medication out from the cavity; (b) an injector assembly for receiving and mounting the ampule assembly and for providing a force to move the plunger assembly to thereby force the liquid medication through the ampule assembly orifice, the injector assembly comprising: (i) an injector body including a barrel closed at its back end, wherein the front end of the barrel is open and configured to receive the second end of the ampule assembly body to thereby mount the ampule assembly on the barrel; (ii) a piston mounted for sliding movement in the barrel, the piston configured to be pushed by gas pressure from an at-rest position at the back end of the barrel toward the front end of the barrel; (iii) a chamber in the injector body configured to house a compressed gas container; (iv) a first passageway in the injector body through which gas flows from the gas container in the gas container chamber to the barrel to provide a force on the rearward-facing surface of the piston to move the piston toward the front end of the barrel; (v) a second passageway in the injector body configured to be open for venting gas released from the gas container to the atmosphere when the end of the ampule assembly is not mounted in the injector assembly barrel; (vi) means for sealing the second passageway to prevent venting gas through the passageway to the atmosphere, the seal provided only when the ampule assembly is mounted in the injector assembly barrel; and (vii) means for releasing gas from the gas container to provide the force on the rearward-facing surface of the piston to thereby move the piston toward the front end of the barrel and into contact with the plunger assembly and for moving the plunger assembly toward the orifice to thereby eject the liquid medication from the cavity out through the orifice.