Disposable infusion device negative pressure filling apparatus and method

1. An infusion system comprising:

a disposable wearable infusion device having a body arranged to be adhered to a patient's skin and a reservoir for holding a liquid medicament to be infused into the patient; and

a filler assembly arranged to be detachably received by the infusion device, the filler configured to receive a source of liquid medicament and providing a negative pressure to pull liquid medicament from the source of medicament to the infusion device reservoir.

2. The system of claim 1 , wherein the source of liquid medicament is a vial of the liquid medicament.

3. The system of claim 1 , wherein the filler assembly is arranged to pull a set volume of the liquid medicament from the source of liquid medicament to the infusion device reservoir.

4. The system of claim 1 , wherein the infusion device reservoir is expandable and wherein the filler includes an expander that provides the negative pressure and expands the volume of the infusion device reservoir to pull the liquid medicament from the source of liquid medicament to the infusion device reservoir.

5. The system of claim 4 , wherein the expander is external to the reservoir.

6. The system of claim 5 , wherein the expander includes a vacuum pump.

7. The system of claim 6 , wherein the infusion device reservoir includes a flexible diaphragm and wherein the expander acts upon the flexible diaphragm to expand the infusion device reservoir.

8. A method comprising: providing a disposable infusion device adapted to adhere to a patient's skin and having a reservoir for holding a liquid medicament to be infused into the patient; providing a medicament filler including a source of liquid medicament and arranged to pull liquid medicament from the source of medicament to the infusion device reservoir; coupling the medicament filler to the infusion device reservoir; and filling the infusion device reservoir with the liquid medicament by pulling the medicament with the medicament filler from the source of liquid medicament into the infusion device reservoir.

9. The method of claim 8 , wherein the coupling step comprises detachably joining the medicament filler to the infusion device.

10. The method of claim 8 , wherein the coupling step further comprises providing the medicament filler with a vial of the liquid medicament.

11. The method of claim 8 , wherein the infusion device reservoir is expandable and wherein the pulling step includes expanding the infusion device reservoir.

12. The method of claim 11 , wherein the expanding step is performed from outside the infusion device reservoir.

13. The method of claim 12 , wherein the expanding step includes pulling a vacuum against the infusion device reservoir.

14. A filler system for filling a reservoir of a disposable wearable infusion device with a liquid medicament, comprising:

an outlet arranged to be detachably received by the infusion device;

a source of liquid medicament; and

a negative pressure generator arranged to provide a negative pressure to pull liquid medicament from the source of medicament to transfer a volume of the liquid medicament to the infusion device reservoir.

15. The system of claim 14 , wherein the source of liquid medicament is a vial of the liquid medicament.

16. The system of claim 14 , wherein the infusion device reservoir is expandable and wherein the negative pressure generator includes an expander that expands the volume of the infusion device reservoir to pull the liquid medicament from the source of liquid medicament to the infusion device reservoir.

17. The system of claim 16 , wherein the expander is external to the reservoir.

18. The system of claim 17 , wherein the expander includes a vacuum pump.