Adjustable volume syringe

1. A system for providing a fluid, the system comprising:

an adjustable volume syringe having a delivery syringe barrel, a reservoir syringe barrel positioned at least partially within and in fluid communication with the delivery syringe barrel, and a reservoir plunger positioned at least partially within the reservoir syringe barrel, wherein the delivery syringe barrel is configured to contain a first amount of a fluid, wherein the reservoir syringe barrel is configured to contain a second amount of the fluid;

a dispensing module in mechanical communication with the adjustable volume syringe;

a processor in operable communication with the dispensing module; and

a non-transitory, computer-readable storage medium in operable communication with the processor,

wherein the non-transitory, computer-readable storage medium contains one or more programming instructions that, when executed, cause the processor to:

determine an administration amount of the fluid to administer;

determine whether the administration amount is greater than, less than, or equal to the first amount of the fluid;

transmit one or more signals to cause the dispensing module to adjust the first amount of the fluid in the delivery syringe barrel to equal the administration amount by increasing or decreasing the second amount of the fluid in the reservoir syringe barrel, and

transmit one or more signals to cause the dispensing module to dispense the administration amount of the fluid from the delivery syringe barrel by moving the reservoir syringe barrel with respect to the delivery syringe barrel to deliver the first amount of the fluid.

2. The system of claim 1 , wherein the fluid comprises a radionuclide.

3. The system of claim 2 , wherein the one or more programming instructions that cause the processor to determine an administration amount of the fluid comprise one or more programming instructions that, when executed, cause the processor to determine the administration amount of the fluid based on an expected administration time, an actual administration time, and a required radioactivity.

4. The system of claim 1 , wherein at least a portion of an interior surface of the reservoir syringe barrel and at least a portion of an exterior surface of the reservoir plunger are threaded.

5. The system of claim 4 , wherein the one or more programming instructions that cause the processor to transmit one or more signals to cause the dispensing module to adjust the first amount of the fluid in the delivery syringe barrel to equal the administration amount comprise one or more programming instructions that, when executed, cause the processor to transmit one or more signals to cause the dispensing module to rotate the reservoir plunger to adjust the second amount of the fluid.

6. The system of claim 1 , wherein the one or more programming instructions that cause the processor to transmit one or more signals to cause the dispensing module to increase or decrease the second amount of the fluid comprise one or more programming instructions that, when executed, cause the processor to transmit one or more signals to cause the dispensing module to move the reservoir plunger with respect to the reservoir syringe barrel.

7. The system of claim 1 , wherein:

the delivery syringe barrel has a proximal end and a distal end, and a delivery syringe fluid port at the distal end of the delivery syringe barrel;

the reservoir syringe barrel has a proximal end and a distal end, and a reservoir syringe fluid port at the distal end of the reservoir syringe barrel; and

the reservoir plunger comprises a reservoir plunger body;

wherein the adjustable volume syringe further comprises a delivery space formed between an exterior surface of the reservoir syringe barrel and an interior surface of the delivery syringe barrel, the delivery space configured to hold the first amount of the fluid; and

a reservoir space formed between an exterior surface of the reservoir plunger body and an interior surface of the reservoir syringe barrel, the reservoir space configured to hold the second amount of the fluid,

wherein the reservoir plunger is movable in a first direction to dispense at least a portion of the second amount of the fluid from the reservoir space into the delivery space to increase an administration amount of the fluid, and

wherein the reservoir plunger is movable in a second direction to withdraw at least a portion of the first amount of the fluid from the delivery space into the reservoir space to decrease the administration amount of the fluid.

8. The system of claim 7 , wherein the adjustable volume syringe further comprises:

a reservoir syringe seal positioned between the exterior surface of the reservoir syringe barrel and the interior surface of the delivery syringe barrel.

9. The system of claim 8 , wherein the reservoir syringe seal comprises an O-ring.

10. The system of claim 7 , wherein the adjustable volume syringe further comprises:

at least one reservoir plunger seal positioned between the exterior surface of the reservoir plunger body and the interior surface of the reservoir syringe barrel.

11. The system of claim 10 , wherein the at least one reservoir plunger seal comprises an O-ring.

12. The system of claim 7 , wherein the reservoir plunger further comprises:

a reservoir plunger thumb-piece at a proximal end of the reservoir plunger, wherein the reservoir plunger body is configured to move distally or proximally within the reservoir syringe barrel when the reservoir plunger thumb-piece is linearly displaced.

13. The system of claim 7 , wherein at least a portion of the interior surface of the reservoir syringe barrel and at least a portion of the exterior surface of the reservoir plunger body are threaded.

14. The system of claim 13 , wherein the reservoir plunger further comprises: a reservoir plunger thumb-piece at a proximal end of the reservoir plunger, wherein the reservoir plunger body is configured to move distally or proximally within the reservoir syringe barrel when the reservoir plunger thumb-piece is rotated.