Self-powered syringe drivers

1. A device 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 from the source 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 flow rate during an initial stage of activation comprising delivery of the medicament,

wherein the source of pressurized fluid comprises a canister of compressible gas, and

wherein the valve comprises a pin received within a recess communicating with the flow path, the pin and recess configured to limit flow of the fluid along the flow path during a final stage of activation after the initial stage of activation to limit advancement of the plunger while the actuator member remains activated such that the flow path from the source to the plunger remains open, thereby limiting flow of the medicament to a maximum flow rate during the final stage.

2. The device of claim 1 , wherein the source of pressurized fluid further comprises a chamber containing incompressible fluid and a piston disposed between the chamber and the canister of pressurized gas to apply a predetermined pressure to the incompressible fluid within chamber when the pressurized gas is released from the canister.

3. The device of claim 2 , wherein the incompressible fluid is a viscous fluid.

4. The device of claim 1 , further comprising one or more connectors for coupling the syringe driver to the proximal end of the syringe cartridge.

5. The device of claim 4 , wherein the one or more connectors comprise one or more flanges on the proximal end of the housing and a latch or bracket on the syringe driver for receiving the one or more flanges.

6. The device of claim 4 , wherein the one or more connectors comprise a receiver on the syringe driver for receiving the proximal end of the syringe cartridge.

7. The device of claim 4 , wherein the one or more connectors removably couple the syringe driver to the syringe cartridge.

8. The device of claim 4 , wherein the one or more connectors permanently couple the syringe driver to the syringe cartridge.

9. The device of claim 1 , further comprising a repeating stroke limiter that limits a number of doses of the medicament that may be delivered from the syringe cartridge.

10. The device of claim 9 , wherein the repeating stroke limiter comprises an adjustment mechanism that is adjustable by a user to set the number of doses.

11. The device of claim 1 , further comprising a volumetric stroke limiter that limits a distance the delivery piston can travel when the actuator member is activated to limit a volume of the medicament that may be delivered from the syringe cartridge.

12. The device of claim 11 , wherein the volumetric stroke limiter comprises an adjustment mechanism that is adjustable by a user to set the volume of the medicament delivered when the actuator member is activated.

13. The device of claim 1 , wherein the source of pressurized fluid further comprises a substantially incompressible liquid.

14. The device of claim 1 , wherein the valve is configured to control flow along the flow path to provide proportional control of a speed at which the plunger advances and the corresponding flow rate of the medicament.

15. The device of claim 1 , wherein the actuator member and valve provide a flow controller that provides an output to the plunger such that the flow rate of the fluid is one of linear, exponential, and polynomial relative to the pressure applied by the pressurized gas.

16. The device of claim 1 , wherein the pin and recess are further configured to provide proportional control during initial activation of the actuator member.

17. A device 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 from the source 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 during an initial stage of activation comprising delivery of the medicament, the valve configured to limit flow of the fluid along the flow path during a final stage of activation after the initial stage of activation to limit advancement of the plunger while the actuator member remains activated such that the flow path from the source to the plunger remains open, thereby limiting flow of the medicament to a maximum flow rate during the final stage of activation.

18. The device of claim 17 , wherein the valve comprises a pin received within a recess communicating with the flow path, the pin and recess configured to limit the flow of the fluid to the maximum flow rate after the actuator member is activated beyond a predetermined position, thereby limiting flow of the medicament to the maximum flow rate during the final stage.

19. The device of claim 18 , wherein the maximum flow rate is greater than no flow rate.

20. The device of claim 1 , wherein the maximum flow rate is greater than no flow rate.