Patent ID: 8864713

Claim:
A hypodermic injection system for removing injectate from an injectate supply for injection into subcutaneous, intramuscular or intradermal region of a body, said injection system comprising: a removable and replaceable injection head operatively attachable to an injectate supply, said injection head including: an injectate chamber for receiving injectate to be injected into a body; an assembly-holding device for holding an orifice exit nozzle to receive injectate from said injectate chamber and for delivering injectate to the body; and a drive system including: a ram device for applying pressure to injectate in said injectate chamber while moving in a forward direction from an initial position to force a first settable amount of injectate into the exit nozzle and into the body, and for relieving the pressure upon completion of an injection and establishing a low pressure in said injectate chamber to effect the transfer of a second settable amount of injectate from the injectate supply to said injectate chamber; a volume restrictor settable according to a volume signal for limiting the distance said ram device is moved out of said injectate chamber to achieve a desired dosage of injectate; and a main actuator assembly operatively connected to a motor for actuating said motor.