Patent ID: RE44847

Claim:
A method of operating a needle-assisted jet-injection device with a proximal and a distal end, the distal end having a movable needle guard concealing a needle with an axial opening through which fluid is ejected, the method comprising the steps of: applying the distal end of the injection device to an injection site so as to gently urge the needle guard to move proximally thereby inserting the needle into the injection site and causing a force-providing mechanism to pressurize a medicament-containing fluid chamber within the jet injection device, wherein the needle is inserted into the injection site to a depth less than 5 mm, wherein the fluid chamber holds from about 0.02 to about 3 ml of a medicament-containing fluid, and wherein the fluid-chamber pressure is sufficient to eject the fluid-chamber contents through the needle in less than about 2.75 seconds as a fluid jet so as to penetrate a certain distance into tissue at the injection site beyond the distal end of the needle.