Patent ID: RE44846

Claim:
A jet injection device, comprising: a housing member having distal and proximal ends; a fluid chamber within the housing member holding about between 0.02 ml and 3 ml of a medicament comprising fluid; an injection-assisting needle disposed at the distal end of the housing member, having an injecting end, and having an association with the fluid chamber to provide a fluid pathway from the fluid chamber through the needle, the injecting end of the injection-assisting needle having an axial opening for ejection of the medicament; a plunger movable within the fluid chamber; and a force generating mechanical member within the housing member that is elastically-deformed so as to provide sufficient force to eject the medicament from the fluid chamber through the needle by jet injection in a high-speed jet that exits the injecting end of the needle through the axial opening thereof at a fluid pressure of about between 100 and 1000 p.s.i. to penetrate patient tissue to a distance through and axially beyond the insertion point to an injection site; wherein the injecting end of the needle has a position extending from the housing member by a length selected for inserting into a patient such that the injecting end reaches a needle insertion point at a depth of up to about 5 mm below the surface of the patient's skin; and wherein the device is further configured such that activation of the force generating mechanical member applies the generated force to the plunger to expel the medicament from the fluid chamber.