SEALED SELF-ACTIVATING INJECTION DEVICE FOR DELIVERY OF MEDICINE FROM A PREFILLED CARTRIDGE OR VIAL

摘要

The disclosed embodiment relates to an injection device that is a single patient use, disposable device containing a needle and a cartridge containing a drug or pharmaceutical product. The device is initially provided in a pre-armed configuration wherein the needle sheath maintains cantilever locking tabs on the housing in a position to the maintain the needle in a position separated from the septum of a cartridge. To arm the device, the practitioner removes the needle sheath and pushes down the plunger assembly. The cantilever locking tabs flex outwardly thereby allowing the cartridge-to-housing interface and the cartridge to move forward whereby the butt end of the needle punctures the septum of the cartridge. Additionally, the cantilever locking tabs form a stop configuration with the housing of the device. The disclosed embodiment is particularly adaptable to dental anesthetic applications, as well as other medical and veterinary applications.

主权项

1. An injection device comprising:
a cartridge with a first cartridge end and a second cartridge end, the first cartridge end being closed and the second end including a cartridge plunger; a housing enclosing the cartridge, the housing including a first housing end and a second housing end, the housing including at least one movable cartridge stop; a needle including a cannula, the needle being engaged to the first end of the housing; and a cartridge adapter with a first adapter end and a second adapter end, the first adapter end engaging the first cartridge end, the adapter further including an annular element slidably engageable within the movable cartridge stop, wherein the adapter is movable between a first position and a second position with respect to the at least one movable cartridge stop.