Patent ID: 6702778
Filing Date: 2004-03-09
Classification: A61M

Abstract:
An automatic injection device containing a pre-loaded charge of medicament for automatically self-administering the medicament upon actuation thereof, said automatic injection device comprising:a housing assembly; a dry compartment for storing a predetermined dry charge of dry medicament therein; a wet compartment for storing a predetermined amount of liquid injection solution therein; a pre-loaded activation assembly for causing the liquid injection solution in said wet compartment to be transferred to said dry compartment, wherein the pre-loaded activation assembly automatically supplies a driving force upon activation to transfer the liquid injection solution in the wet compartment to the dry compartment, wherein the dry medicament dissolves in the liquid injection solution as the liquid injection solution passes through said dry compartment; at least one dynamic spring compression assembly for maintaining the dry medicament located in said dry compartment under a continuous compressive state as the liquid injection solution passes through said dry compartment, wherein at least a portion of a compressive force acting on the dry medicament located in said dry compartment is provided by said at least one dynamic spring compression assembly; and a needle assembly for dispensing the liquid injection solution containing the medicament dissolved therein.