A device (8, 108, 208) for delivering a medicament into a patient's body, comprising: a syringe cartridge comprising a housing including a proximal end, a distal end, and defining an interior, the cartridge further comprising a piston slidably disposed within the interior for delivering a medicament within the interior through a port in the distal end; and a syringe driver comprising a plunger for advancing the piston within the interior of the housing, a source of pressurized fluid, a valve, and an actuator member coupled to the valve for selectively opening a flow path (56b, 56c) from the source of pressurized fluid to the plunger to control flow of the pressurized fluid to advance the plunger to deliver medicament from the interior of the housing at a desired rate, wherein the source of pressurized fluid comprises a chamber containing incompressible fluid, a source of pressurized gas, and a piston disposed between the chamber and the source of pressurized gas to apply a predetermined pressure to the incompressible fluid within chamber when the pressurized gas is released from the source of pressurized gas, characterized in that the source of pressurized gas comprises a canister of compressible gas within the housing, and the valve comprises a pin received within a recess, said pin being mounted on a carriage coupled to the actuator such that activation of the actuator causes the carriage and the pin to move proximally, said pin communicating with the flow path, the pin and recess configured to provide proportional control during initial activation of the actuator and to limit flow of the fluid along the flow path during a final stage of activation to limit advancement of the plunger, thereby limiting flow of the medicament to a maximum flow rate during the final stage; wherein the pin that is received within the recess communicates with a relatively small cross-section passage that communicates with a plunger chamber within which a proximal end of the plunger is received, and wherein the pin and recess are sized such that, during the final stage of actuation, the pin exits the recess entirely and the flow rate into the passage is limited given the relatively large size of the recess compared to the passage, thereby limiting the flow of the fluid into the plunger chamber to a predetermined maximum flow rate. a syringe cartridge comprising a housing including a proximal end, a distal end, and defining an interior, the cartridge further comprising a piston slidably disposed within the interior for delivering a medicament within the interior through a port in the distal end; and a syringe driver comprising a plunger for advancing the piston within the interior of the housing, a source of pressurized fluid, a valve, and an actuator member coupled to the valve for selectively opening a flow path (56b, 56c) from the source of pressurized fluid to the plunger to control flow of the pressurized fluid to advance the plunger to deliver medicament from the interior of the housing at a desired rate, wherein the source of pressurized fluid comprises a chamber containing incompressible fluid, a source of pressurized gas, and a piston disposed between the chamber and the source of pressurized gas to apply a predetermined pressure to the incompressible fluid within chamber when the pressurized gas is released from the source of pressurized gas, characterized in that the source of pressurized gas comprises a canister of compressible gas within the housing, and the valve comprises a pin received within a recess, said pin being mounted on a carriage coupled to the actuator such that activation of the actuator causes the carriage and the pin to move proximally, said pin communicating with the flow path, the pin and recess configured to provide proportional control during initial activation of the actuator and to limit flow of the fluid along the flow path during a final stage of activation to limit advancement of the plunger, thereby limiting flow of the medicament to a maximum flow rate during the final stage; wherein the pin that is received within the recess communicates with a relatively small cross-section passage that communicates with a plunger chamber within which a proximal end of the plunger is received, and wherein the pin and recess are sized such that, during the final stage of actuation, the pin exits the recess entirely and the flow rate into the passage is limited given the relatively large size of the recess compared to the passage, thereby limiting the flow of the fluid into the plunger chamber to a predetermined maximum flow rate.