Infusion device provided with a water-tight cover

1. An infusion device for therapeutic use, comprising a waterproof covering which forms one of a casing, casing part or a container for storing the infusion device and monitoring means for monitoring the water-impermeability of the covering, the monitoring means comprising:

a) a medium situated in the covering and having at least one physical or chemical parameter which changes in accordance with the impermeability of the covering; and

b) information means which, if said parameter changes, automatically outputs an information signal, at least when the extent of the change signifies a loss of water-impermeability in the covering;

wherein the medium is a gas or vapour which fills the inner space enveloped by the covering; and

wherein the physical or chemical parameter is pressure, and the monitoring means comprises a pressure detector for the pressure prevailing in the inner space or a differential pressure between the inner space and the outer surroundings of the covering.

2. The infusion device according to claim 1 , wherein the monitoring means comprises a detector which detects a change in a value of the physical or chemical parameter and feeds a detection signal to the information means in accordance with the value of the parameter, from which the information means forms the information signal.

3. The infusion device according to claim 1 , wherein the gas in the inner space exhibits a differential pressure relative to the outer surroundings of the covering.

4. The infusion device according to claim 1 , wherein the monitoring means comprises pressure means for maintaining or generating a differential pressure which the inner space exhibits relative to the outer surroundings of the covering.

5. The infusion device according to claim 4 , wherein the monitoring means automatically maintains the differential pressure or generates it at predetermined time intervals by using the pressure means.

6. The infusion device according to claim 5 , wherein the infusion device comprises an energy source which supplies the pressure means with energy, and a controller which controls the pressure means in accordance with the differential pressure.

7. The infusion device according to claim 5 , wherein the pressure means comprises a pump and a drive for the pump.

8. The infusion device according to claim 7 , wherein the drive also conveys a product which can be administered by the infusion device.

9. The infusion device according to claim 4 , wherein the pressure means comprises an operating or activating element and generates the differential pressure when the operating or activating element is manually activated.

10. The infusion device according to claim 4 , wherein the pressure means comprises a pump for a pump action which is to be performed manually, wherein the pump can be activated by push key.

11. The infusion device according to claim 4 , wherein the pressure means comprises an electrochemical gas cell which generates a gas and releases it in the inner space of the covering.

12. The infusion device according to claim 11 , further comprising conveying means for conveying a product to be administered using the infusion device and a battery for supplying a drive for the conveying means, the battery forming the gas cell.

13. The infusion device according to claim 1 , wherein the monitoring means outputs the information signal in accordance with the time in which the value of the physical or chemical parameter changes to a predetermined extent.

14. An infusion device for therapeutic use, comprising a waterproof covering which forms one of a casing, casing part or a container for storing the infusion device and monitoring means for monitoring the water-impermeability of the covering, the monitoring means comprising:

a) a medium situated in the covering and having at least one physical or chemical parameter which changes in accordance with the impermeability of the covering; and

b) information means which, if said parameter changes, automatically outputs an information signal, at least when the extent of the change signifies a loss of water-impermeability in the covering,

wherein the medium is a gas or vapour which fills the inner space enveloped by the covering with a pressure burden, the infusion device comprises a reservoir arranged in the covering for a product to be administered, and the pressure burden conveys the product.

15. The infusion device according to claim 14 , wherein a container for the product is accommodated in the covering, and the pressure burden for conveying the product drives a conveying member acting on the product in the container or the container is flexible and is compressed by the pressure burden to convey the product.

16. The infusion device according to claim 15 , wherein the infusion device comprises dosing means which forms a dosing chamber having a particular chamber volume, and wherein the pressure burden conveys the product into the dosing chamber and the dosing means conveys the product out of the dosing chamber.

17. An infusion device comprising a substantially impermeable covering which forms one of a casing of the infusion device, a part of the casing, or a container for storing the infusion device and a monitor for monitoring the impermeability of the covering, the monitor comprising:

a medium having at least one physical or chemical parameter which changes in accordance with a change in the impermeability of the covering; and

an output which, if said parameter changes, automatically outputs an information signal, at least when the extent of the parameter change signifies a loss of impermeability of the covering,

wherein the medium is a gas or vapour which fills an inner space enveloped by the covering, wherein the physical or chemical parameter is pressure, and the monitor comprises a pressure detector for one of the pressure in the inner space or a differential pressure between the inner space and the outer surroundings of the covering.