Infusion pump assembly

1. A wearable infusion pump assembly comprising:

a reservoir for receiving an infusible fluid; and

a fluid delivery system configured to deliver the infusible fluid from the reservoir to an external infusion set, wherein the fluid delivery system comprising:

a controller;

a pump assembly for extracting a quantity of infusible fluid from the reservoir and providing the quantity of infusible fluid to the external infusion set, the pump assembly comprising a pump plunger, the pump plunger having distance of travel, the distance of travel having a starting position and an ending position;

at least one optical sensor assembly for sensing the starting position and ending position of the pump plunger distance of travel and sending sensor output to the controller, the optical sensor assembly sensing the intensity of light reflected from the pump plunger as a function of distance; and

a first valve assembly configured to selectively isolate the pump assembly from the reservoir, wherein the controller receives the sensor output and determines the total displacement of the pump plunger.

2. The wearable infusion pump assembly of claim 1 further comprising wherein the controller correlates the displacement of the pump plunger to a volume of fluid delivered.

3. The wearable infusion pump assembly of claim 2 further comprising wherein the controller, based on the volume of fluid delivered, commands an actuator to actuate the pump plunger to a target position.

4. The wearable infusion pump assembly of claim 1 further comprising:

a disposable housing assembly including the reservoir and a first portion of the fluid delivery system; and

a reusable housing assembly including a second portion of the fluid delivery system.

5. The wearable infusion pump assembly of claim 4 wherein the first portion of the fluid delivery system is positioned within the disposable housing assembly, and the second portion of the fluid delivery system is positioned within the reusable housing assembly.

6. The wearable infusion pump assembly of claim 4 wherein a first portion of the first valve assembly is positioned within the disposable housing assembly, and a second portion of the first valve assembly is positioned within the reusable housing assembly.

7. The wearable infusion pump assembly of claim 4 wherein a first portion of the first valve assembly is positioned within the disposable housing assembly, and a second portion of the first valve assembly is positioned within the reusable housing assembly.

8. The wearable infusion pump assembly of claim 1 wherein the external infusion set is a detachable external infusion set configured to releasably engage the fluid delivery system.

9. A wearable infusion pump assembly comprising:

a reservoir; and

a fluid delivery system configured to deliver an infusible fluid from the reservoir to an external infusion set, wherein the fluid delivery system comprising:

a controller;

a pump assembly for extracting a quantity of the infusible fluid from the reservoir and providing the quantity of the infusible fluid to the external infusion set, the pump assembly comprising a pump plunger, the pump plunger having distance of travel, the distance of travel having a starting position and an ending position;

at least one optical sensor assembly for sensing the starting position and ending position of the pump plunger distance of travel and sending sensor output to the controller, the optical sensor assembly sensing the intensity of light reflected from the pump plunger as a function of distance; and

a first valve assembly configured to selectively isolate the pump assembly from the reservoir, wherein the controller receives the sensor output and determines a total displacement of the pump plunger.

10. The wearable infusion pump assembly of claim 9 wherein the controller receives the sensor output and determines the volume of the fluid delivered.

11. The wearable infusion pump assembly of claim 9 further comprising wherein the controller correlates the displacement of the pump plunger to a volume of fluid delivered.

12. The wearable infusion pump assembly of claim 11 further comprising wherein the controller, based on the volume of fluid delivered, commands an actuator to actuate the pump plunger to a target position.

13. The wearable infusion pump assembly of claim 9 further comprising:

a disposable housing assembly including the reservoir and a first portion of the fluid delivery system; and

a reusable housing assembly including a second portion of the fluid delivery system.

14. The wearable infusion pump assembly of claim 13 wherein the first portion of the fluid delivery system is positioned within the disposable housing assembly, and the second portion of the fluid delivery system is positioned within the reusable housing assembly.

15. The wearable infusion pump assembly of claim 13 wherein a first portion of the first valve assembly is positioned within the disposable housing assembly, and a second portion of the first valve assembly is positioned within the reusable housing assembly.

16. The wearable infusion pump assembly of claim 13 wherein a first portion of the first valve assembly is positioned within the disposable housing assembly, and a second portion of the first valve assembly is positioned within the reusable housing assembly.

17. The wearable infusion pump assembly of claim 9 wherein the external infusion set is a detachable external infusion set configured to releasably engage the fluid delivery system.