NEEDLE-FREE INTRADERMAL INJECTION DEVICE

A needle-free injection device suitable for delivering a therapeutic substance into the intradermal space of a patient. The needle-free injection device includes a first handle positioned to pivot between an open position and a closed position, a main spring, and a hammer engaged with the main spring. The needle-free injection device also includes a return sleeve engaged with the hammer when the first handle is in the open position. The return sleeve is disengaged with the hammer when the first handle is in the closed position. Needle-free injection systems and methods of operating a needle-free injection device are also disclosed.