Patent ID: 7654983

Claim:
A device for injecting a viscous medicament comprising: a body comprising a dispenser having a reservoir for containing the viscous medicament and a needle suitable for injecting the medicament, wherein the gauge of the needle is equal to or greater than about 21 gauge; a cap adapted for attachment to the body, the cap comprising a pressurized gas source, wherein the pressurized gas source includes a microcylinder of compressed gas; a driver situated between the cap and dispenser and activated by flow of pressurized gas from the pressurized gas source and arranged to exert an insertion force and an injection force against the dispenser, the injection force being of sufficient magnitude to drive the viscous medicament through the needle with sufficient force to cause injection of the medicament; a bias mechanism which retains the reservoir and needle in a retracted position within the dispenser until the driver exerts the insertion force against the dispenser; and an actuator adjacent the pressurized gas source and configured to compromise the microcylinder to initiate the flow of pressurized gas from the pressurized gas source to the driver.