Status indicator of a drug delivery system

1. An indicator device for indicating an infusion status of a medical device adapted to deliver a solution stored in a reservoir to a patient, the indicator device comprising:

a body;

an elongated cavity in the body and having a first end and a second end;

a first plunger configured to move relative to the elongated cavity and arranged into the elongated cavity dividing the elongated cavity in a first variable volume and a second variable volume, the first plunger configured to adapt different positions including,

a first initial position which indicates a state before infusion,

a second position which indicates a state during infusion, and

a third position which indicates a state at the end of the infusion; and

a port providing a pressure communication between the reservoir and the elongated cavity such that the first plunger moves depending on a pressure of the solution intended to be delivered, and such that the second position is reached due to an increase of a pressure of the reservoir and that the third position is reached when the reservoir is substantially empty.

2. The indicator device according to claim 1 , further comprising:

a second plunger configured to move relative to the elongated cavity, the second plunger moves through the second variable volume.

3. The indicator device according to claim 2 , wherein the second plunger performs a motion caused by a forth motion of the first plunger.

4. The indicator device according to claim 2 , wherein the second plunger comprises a through hole.

5. The indicator device according to claim 1 , wherein the first plunger is configured to perform a back-and-forth motion.

6. The indicator device according to claim 1 , wherein a first volume is in pressure communication with the reservoir storing the solution intended to be delivered.

7. The indicator device according to claim 1 , further comprising: a position indicator window disposed on an exterior surface of the indicator device and configured to provide an external visual indication of the different positions of the first plunger.

8. The indicator device according to claim 1 , further comprising: a biasing device configured to induce a back motion of the first plunger.

9. The indicator device according to claim 1 , wherein the indicator device is configured to indicate at least one of the following states:

before infusion,

during infusion,

at the end of the infusion,

before reservoir filling,

during reservoir filling,

at the end of the reservoir filling,

a failure, and

a leakage.

10. A medical device adapted to deliver a solution to a patient, the medical device comprising:

a pressurized reservoir for storing the solution;

an indicator device including,

a body,

an elongated cavity in the body and having a first end and a second end, and

a first plunger configured to move relative to the elongated cavity and arranged into the elongated cavity dividing the cavity into a first variable volume and a second variable volume, the first plunger is configured to adapt different positions including,

a first initial position which indicates a state before infusion,

a second position which indicates a state during infusion, and

a third position which indicates a state at the end of the infusion,

a port providing a pressure communication between the pressurized reservoir and the elongated cavity such that the first plunger moves depending on a pressure of the solution intended to be delivered such that the second position is reached due to an increase of a pressure of the reservoir and that the third position is reached when the pressurized reservoir is substantially empty,

an outlet port in fluid communication with the patient; and

a fluid pathway from an interior of the pressurized reservoir to the outlet port,

wherein the indicator device is in pressure communication with the fluid pathway.

11. The medical device according to claim 10 , wherein the indicator device further comprises:

a valve device configured to prevent the solution from reaching the outlet port.

12. The medical device according to claim 11 , wherein the valve device is a part of the first plunger which occludes the fluid pathway when the first plunger is in a predetermined position.

13. The medical system according to claim 10 , further comprising:

a housing defining an internal cavity accommodating the pressurized reservoir and a vent configured to vent the internal cavity of the housing.

14. The medical system according to claim 13 , further comprising:

a removably occluding device configured to occlude the vent at least during a filling process of the pressurized reservoir or a storing period.